235 results about "Grid security" patented technology

The invention belongs to the field of power network safety operation, and in particular relates to a distribution network failure isolation and quick power service restoration decision support system. The system is connected with a distribution automation system, comprises a real-time subsystem, a simulation subsystem, an accident inversion subsystem and a knowledge generating subsystem, and acquires power network operation monitoring data from the distribution automation system through a data interface, automatically tracks the real-time operating state of the power network, can quickly provide a power supply restoration scheme and intuitive simulation effect for a dispatcher to determine a proper restoration sequence after a failure happens, and provides accident simulation and accident inversion function; and the subsystems can be subjected to interface switching. The system is suitable for a distribution network which has a complicated network structure and of which the failure cannot be treated by automation equipment.

The invention relates to a relay protection running management information system, which consists of a main station layer, a substation layer and an equipment layer, wherein the main station layer consists of a database, an application layer and a client layer; the database is used for storing system structure model data and historical sampling data; the application layer realizes encapsulation of system application logic at a server end; the client layer comprises a system model management module, a fault analysis module, an equipment management module and a valuing and checking module which are flexibly distributed under network environment and serve as client application, and a communication management module; and the substation layer comprises a communication service module and a system management module, and is used for accessing various IED devices in field, communicating with the IED devices in field and completing protocol converting and data forwarding functions. The system improves the informatization and intelligence levels of a power grid safety running dispatching system, and can provide real-time fault information for the dispatching when a power grid is failed so as to improve the automation level of the dispatching.

The invention provides a grid security comprehensive evaluation method which includes that a set of complete two-stage in-advance comprehensive evaluation index system and an each-stage security evaluation index calculating method are built aiming at the requirement of grid security operation evaluation, a grid security comprehensive evaluation model based on a gray area correlation analysis method and the game theory is further provided, initial evaluation is conducted on each one-stage index by the model, an obtained evaluation result is subjected to comprehensive evaluation, a correlation coefficient matrix of each one-stage index is determined by adopting the gray area correlation analysis method, weights are obtained by utilizing a game collection model pair analytic hierarchy process (AHP), an artificial neural network (ANN) and an entropy weight method and are objectively combined to obtain a combined weight, initial evaluation is conducted on each one-stage index, the AHP is adopted to determine a one-stage index weight, and the one-stage index weight and an initial evaluation result are subjected to weighing calculation to further obtain a grid security comprehensive evaluation result, namely the grid security quality ordering.

The invention provides a grid security risk assessment method and model based on situation awareness. Decision-making objectives of dispatchers serve as cores, situation awareness technology is applied to grid security risk assessment, active prospective grid situation awareness abilities and blackout security defense abilities of the dispatchers are greatly improved, the asset utilization rate of grids can be increased, and strong, economical, secure and superior objectives of the smart grids are achieved. The method includes the steps: firstly, perceiving grid situations; secondly, understanding the grid situations; thirdly, forecasting the grid situations.

The invention discloses a power grid safety optimization dispatching method considering demand response. The method comprises the following steps: establishing a dynamic excitation compensation mechanism, and carrying out modeling on demand response behaviors of a user according to load shedding and transfer features; establishing a calculation model of power grid reliability index loss-of-load probability and expected energy not supplied; converting a reliability index into an economic index and integrating the index into an objective function, and establishing a day-ahead economic dispatch model with the total operation cost minimum being as an objective; establishing constraint conditions to enable an electric power system to meet system constraints, unit constraints and security constraints; and carrying out solving through calculation software to obtain an optimal day-ahead economic dispatch result. The demand response and reliability index are integrated into day-ahead dispatching of the electric power system, and the optimal dispatching model considering dynamic excitation compensation and expected power failure loss is established, thereby coordinately solving the problem of unit commitment of a generation power side and the problem of supply-demand interaction of a demand side and realizing economy and security of operation of a power grid.

The invention discloses an implement method for automatic generation of a visible power grid trend chart in a dispatching system. The method comprises the following steps: (1) according to set chart forming granularity filter conditions, station pels and circuit pels are generated in a picture through a drawing tool of the dispatching system; (2) intelligent layout is conducted to the station pels through a network topological graph arithmetic based on an expanding mechanical model; (3) intelligent wiring is conducted to the picture after the intelligent layout by using a maze arithmetic; (4) a parameter in a bank is related automatically and labels such as measurement, a dynamic trend and a visible pie chart are conducted automatically, and the visible power grid trend chart is generated finally. According to the implement method for automatic generation of the visible power grid trend chart in the dispatching system, the visible power grid trend chart needed by the dispatching system can be generated rapidly, so that powerful technical support is provided to implement of the dispatching system and power grid analytical research. Due to intelligent and automatic chart forming process, efficiency is improved, omissions caused by human factors are greatly reduced and technical guarantee is provided to safe and stably running of a power grid.

The invention discloses a smart grid dispatching control system regulation and control integrated join simulation training system. The smart grid dispatching control system regulation and control integrated join simulation training system relates to a simulation training system. For the problems that training of dispatchers and monitors breaks away from actual situations, training quality is not ideal, regulation and control service level cannot be improved effectively, and safe, reliable, economical and efficient operation of a power grid is influenced in the prior art, the invention provides such smart grid dispatching control system regulation and control integrated join simulation training system, which comprises a dispatcher training simulation subsystem for dispatcher training simulation, and a monitor training simulation subsystem for monitor training simulation. The dispatcher training simulation subsystem and the monitor training simulation subsystem respectively comprise a power system simulation module, a regulation and control center simulation module and a teacher system module. The monitor training simulation subsystem shares a part of modules of the dispatcher training simulation subsystem. The technical scheme can improve professional skill training efficiency of the power grid monitors and dispatchers, reduce training period and improve training quality, so that a high-quality staff team can be developed within a short time, and safe, reliable, economical and efficient operation of the power grid is ensured.

The invention relates to a generating method of a universality cost space when an electric grid dispatching mechanism draws up generation plans meeting various security constraints, and provides a 'sequence cost space' construction method required by an optimization algorithm, including information of a generation dispatching loading sequence, a constraint adjustment sequence, and the like by summarizing production rules of dispatch and combining an electric power market with an economics theory of energy-saving dispatch. Cost management is cooperated in the process of solving security-constrained economic dispatch, such that the optimization algorithm can universally meet requirements on various generating modes of just, fair and open dispatch, energy-saving dispatch, cost dispatch, electric power market, and the like, and a new solving way is provided for realizing generation resource optimum distribution and large electric grid security constraint, reducing loss of the electric grid and further improving electric transmission and transformation resource. The invention provides a time-saving, labor-saving and universal cost space generation method without needing of carrying out complex mold construction and solution according to the particular case in the security-constrained dispatch.

The invention provides a power system dynamic security assessment comprehensive model and a spatiotemporal visualization method. The method comprises the following steps: constructing a dynamic security index and establish an initial sample set for dynamic security assessment based on the historical operation data of a power system and a predicted accident set; 2) constructing a feature selectionframework, performing feature selection on the initial sample set and forming a processed high-efficiency sample set; 3) constructing an online dynamic security assessment comprehensive model based ona random bit forest and performing offline training and updating on the model by using the high-efficiency sample set; and 4) using the continuously updating dynamic security assessment model to complete the online assessment of the dynamic security state and using the spatiotemporal visualization method to realize the visual presentation of the dynamic security information. The purpose of the present invention is to provide the online dynamic security assessment comprehensive model and the spatiotemporal visualization method which are beneficial to the system operators to take timely preventive and control measures, avoid large power outage caused by accidents and improve the secure operation level of the power grid.

The invention provides an equivalent coordinative optimization method for a large-scale power grid dispatching plan. The optimization method comprises the steps as follows: (1) a large power grid is divided into a plurality of regional power grids, and the regional power grids are taken as equivalent nodes; (2) the regional power grids submit information of the equivalent nodes to the whole grid; (3) the whole grid determines a generation dispatching plan under the equivalent regional power grids, and issues a connecting line plan between the regions, planned total output of the regional power grids and a plan of a direct dispatching set; (4) the regional power grids calculate and determine output plans of regional sets according to the planned total output of the regional power grids, and calculate locational marginal cost; and (5) whether full-grid optimization is converged or not is judged through the marginal cost of two ends of a connection line, if so, calculation is ended, if not, the set which affects the grid security constraint corrects output bounds according to the optimization result and turns to the step (2). The iteration times can be controlled; the convergence is rapid; and rapid determination of the large power grid dispatching plan can be achieved.

The “Grid Security Monitor” tracks the security status of resources in a grid computer system. When a client submits a job to the grid scheduler, the Grid Security Monitor creates a security contract. The security contract comprises all the security credentials needed to access the resource executing the job, as well as privacy and security requirements. The Grid Security Monitor compares the security status of the resource to the requirements of the security contract. If the security status of the resource changes or violates the security contract, then the Grid Security Monitor notifies the client. The Grid Security Monitor has a user interface that allows the client to perform a manual security validation by asking the grid management system to verify the security status of the resource.

The invention relates to the technical field of grid fault treatment and particularly provides a warning signal analysis method of a regulation and control center and an intelligent warning system based on the warning signal analysis method of the regulation and control center. Real-time monitoring and comprehensive analysis of SCADA / EMS warming signals are achieved on the basis of two intelligent methods of an external rule and an internal expert knowledge base, the current situation that the warning signals are isolated from one another and are disordered is changed, and a fault and an exception in a power grid can be timely found out through correlation analysis. The external rule definition function of the system is completely open to users, authorized users all can log onto a rule maintenance interface and carry out corresponding operations to meet the regulation and control integration operation requirements of a large power grid, and a dispatcher is assisted in analyzing the grid fault, so that the accident emergency treatment efficiency and capability are improved and safe and stable operation of the power grid is ensured.

The invention relates to a method for safe and stable operation and management of an electric system, in particular to a method for monitoring safety and stability of an electric network based on a stable monitoring rule information model. The method has the following advantages: 1) the unified management of a stable and regular spanning safety area is realized, the consistency and integrality of the stable information in different safety areas of electric network operation are ensured,, and the safety hole existing in the stable running of the electric network is eliminated; 2) an electric network schedule automation system can automatically select a stable control surface and a corresponding stable limitation to carry out monitoring in real time, and the potential risks brought to the operation of the electric network by the factors of incomplete, non-unified and untimely manual maintenance on the section and the limitation in the current electric network schedule automation system are eliminated.

The invention discloses a power plant level automatic power generation control system applied load optimizing and distributing method. The method is carried out through the following steps: pre-classifying a plurality of sub-clusters of generator sets according the properties of the generator sets of the power plant; optimizing and distributing load to the plurality of sub-clusters of generator sets according to the principle of using the least amount of coals; attaining the best load state space of each generator set in each sub-cluster of the generator sets within an allowed load and storing best load state space in a database of a system; performing load distribution according to a speed regulation priority method or a coal consumption optimizing method so as to check the best load state space of the sub-clusters of generator sets and attaining the best load of all generator sets in the power plant with the attained best load of all machines transmitted to an automatic control system through a monitoring apparatus of a plant level AGC system. The invention further provides a system corresponding the method. According to the invention, the method is capable of effectively shortening the calculation and distribution time for load when a power plant comprises a great number of generator sets with vast type difference so as to fulfill the requirement of safety control to a power grid and to improve the authenticity and the accuracy of an optimization result.

The invention relates to a monitoring system, in particular to an automatic video monitoring system of electricity field operation. The automatic video monitoring system acquires the positioning data of workers of electricity field operation through a global positioning system, processes and judges the positioning data and the related data of a monitoring pick-up device, realizes the automatic video monitoring of the field workers, executes safety alarm, ensures each worker to be subject to video monitoring and alarms the workers who against rules in time, thereby ensuring the personal safety of the workers, enhancing the utility ratio of the monitoring pick-up device, also strengthening the public safety awareness of the workers, enhancing the safety control level of the electricity field operation, decreasing the personnel liability accidents, enhancing the safety operation level of a power grid and bringing about enormous social benefits. Thus, the automatic video monitoring system has important significance and practical value and provides powerful technical support for electricity production.

A method, apparatus, and article of manufacture are provided to support security in a distributed gird computer cluster. Each non-node root node in the cluster is configured with a local security agent, and the root node is configured with a security controller to manage each of the security agents of each non-root node. The security agent of each non-root node is in communication with an associated configuration file that contains data private to the respective non-root node, to allow the security agent to manage security local to the node. The security controller of the root node is in communication with a controller configuration file that contains data that applies to all security agents in the grid cluster, to allow the controller to manager the security agents.

The invention relates to a power generation margin distribution method for a photovoltaic power station based on power grid security constraints and belongs to the field of running and control technologies of new energy electric power systems. The power generation margin distribution method for the photovoltaic power station based on power grid security constraints includes that according to a fair scheduling principle, after the photovoltaic power station enters a free power generation state, the space of a power grid for performing photovoltaic power generation is uniformly distributed for each photovoltaic power station according to a minimum load rate deviation method, on the one hand, unnecessary photovoltaic power discarding due to a too small active set value of the photovoltaic power generation is avoided, and on the other hand, the problem that the power output by the photovoltaic power generation surpasses the power grid bearing capacity due to a too large active set value due to distributing the photovoltaic power generation capacity is avoided. The power generation margin distribution method for the photovoltaic power station based on power grid security constraints is integrated in a photovoltaic power generation active control master station run by a dispatching center to enable the system to implement an optimal control strategy in real time according to the photovoltaic power generation running state and the power grid running state, maintain enough backspin security space for the power grid, guarantee the active power security of the section of a connecting wire of the photovoltaic power station and the power grid and guarantee the fair scheduling among the photovoltaic power stations.

Disclosed is an implementation method of a grid security system which can update the proxy certificate automatically; the implementation method is a strategic method and adopts a regular check mechanism to check the proxy certificate of the operation continuously; once the overdue proxy certificate is detected and the proxy is updated automatically to ensure the normal running of the operation. The grid security system which can update the proxy certificate automatically is mainly composed of a grid security system client, a grid security system server, a grid security system certificate updating module and a certificate repository; the proxy updating service uses the function provided by the certificate repository. From the logical viewpoint, the service can be considered as a module of the operation management system; the module records and manages the proxy certificates of the submitted operations and the operations require the proxy to be updated; therefore, the operation maintained by the service remains the validity through the way; the updated proxy is searched back from the certificate repository periodically to replace the proxy which is about to be overdue.

The invention relates to a defense method for multi-stage network attack of a power information physical system, comprising the following steps: firstly estimating the modes and resources of the attack and defense sides, adopting a staged offensive and defensive process, and determining the total number of stages of attack and defense; secondly, sequentially calculating the load shedding values ofall possible attack and defense combinations in the next stage using the optimal load shedding algorithm to obtain the potential return of each attack and defense strategy in the current stage; stipulating that the attacker and the defender are simultaneously operated, and obtaining the return matrix of the action of both parties based on the game strategy; getting the Nash equilibrium point of the game by integrating multiple stages, and constructing a decision table to provide guidance for the defense party's active defense method. The invention provides a defense method for coping with multi-stage network attacks, and comprehensively considers resources and means of both offense and defense parties, and may guide the establishment of a grid security defense mechanism.

The invention relates to a source network coordinated scheduling method for improving wind electricity admitting ability of power grid. Aiming at problems existing in large-scale wind electricity networking operation in China that transmittability of the power grid is limited and wind turbine generator preparing to enter network can not be scheduled to enter network. Steps are adopted that confirming transmit electricity space of a path of transmitting wind electricity, confirming relationship between the max generated power of wind electricity and installed capacity of wind electricity, ensuring that scheduling scheme of safe operation of the power grid is disposed conservatively and the like, so that under the condition of ensuring grid security, the transmittability of the power grid is used to the maximum, generated energy of wind turbine generator is increased obviously, and waste wind of the wind electricity is reduced. Economic benefit and environmental benefit of utilizing wind energy are improved.

The access control decision-making unit is a scheme to solve how to implement access control of resources and services to users. The scheme is a dynamic access control model of grid with four elements being appended. That is to say besides four basic elements: user, object, role and authority, the access control decision-making unit adds four elements: grant, obligation, condition and prescription so as to build access control decision-making mechanism of grid based on the model. Expanding access control functions based on role, the invention enhances dynamic characteristics of access control decision-making so as to provide a new mode of access control mechanism in grid security.

The invention discloses an online evaluation method and system for provincial power grid adequacy, and relates to the analysis of power grid adequacy. At present, provincial dispatching operation personnel lack the power supply readability of loads in a provincial power grid subregion and the monitoring and the analysis of a transfer capability. The method comprises the following steps that: obtaining the real-time operation model data of a power grid; carrying out fracture surface load flow regulation and dynamic partitioning; carrying out system adequacy analysis and evaluation; carrying outsubregion adequacy analysis and evaluation; and making an adequacy insufficiency auxiliary decision: when system adequacy and / or subregion adequacy is insufficient, carrying out the auxiliary decision analysis, and outputting a corresponding auxiliary decision measure and adequacy monitoring data. By use of the technical scheme, the system adequacy and the subregion adequacy are subjected to online analysis, a power grid adequacy state is monitored and given an alarm, the auxiliary decision when the adequacy is insufficient is provided, the ability of the dispatching operation personnel forperceiving, coping with and actively mastering the power grid adequacy is improved, a provincial power grid adequacy level is further improved, and the power grid is guaranteed to safely and stably operate.

The invention relates to a block chain-based intelligent electric car grid security payment system and method, and belongs to the field of V2G network payments. According to role definition, the system comprises electric car users, a registration authority (RA) and a block chain network. According to function partitioning, the system comprises a registration module, a payment execution module anda data share module. Based on a block chain technology and a cryptology technology, a special registration mechanism, a verification mechanism and a new payment mechanism are adopted. According to themethod, the problems of data share and user identity privacy protection in the field of V2G network payment can be solved, and effective supervision and privacy protection can be realized. The systemand the method are capable of reducing external attack threats and realizing data share, more accord with practical application scenes, are capable of supporting effective audition and protecting privacy data under the condition that audition is supported, and are capable of considering the demands in the two aspects of transaction data share and privacy information leakage prevention.

The invention discloses a method for planning a distribution network based on full life cycle cost management. The method comprises the process that a calculation model for the full life cycle cost of a distribution network planning scheme is provided under the premise of meeting safe and stable running of a power grid, distribution network path planning is optimized by using a clustering crowding niche genetic algorithm by taking the minimum full life cycle cost as an objective function, a distribution planning scheme with the minimum full life cycle is acquired through performing comparative analysis on the full life cycle cost of different switch arrangement patterns, and finally the feasibility and effectiveness of the method are proven through calculating examples. The method provides a new analysis method and an assistant decision-making theory basis for distribution network planning, running and transformation and operation benefits of electric power companies, power grid formulation technologies are optimized, and a planning scheme with the optimal economical efficiency is acquired.

The invention discloses an intelligent power grid security data aggregation method and system based on a block chain technology. A credible authority is responsible for managing and distributing secret information of all other entities; a control center is responsible for integrating, processing and analyzing periodic time sequence data of the cell network nodes and providing comprehensive and reliable intelligent services; agateway is responsible for aggregating the data submitted by the user; a sensing nodes are responsible for collecting data in real time and forwarding the data to the control center. The method includes a system initialization stage; a data collection stage; a security data aggregation stage; an accounting node selection stage; a new block generation stage; a block verification stage; and a decision support stage. On the basis of deeply researching and analyzing the existing application achievements of the block chain technology in the field of smart power grid application, the smart power grid security data aggregation method and system based on the block chain technology are realized, and meanwhile, the user privacy is protected and the confidentiality and integrity of communication data are ensured.

The invention relates to a fault correlation domain identification system based on fault component reactive power and a method thereof and belongs to the electric power system fault identification technology field. The fault correlation domain identification system comprises a correlation domain division subsystem and a protection motion determination subsystem, wherein the correlation domain division subsystem takes each start protection station as a center and takes a same voltage grade outgoing line pair end station as a boundary division protection correlation domain, the protection motion determination subsystem realizes establishment of a protection algorithm model, a protection algorithm information selection module extracts fault component reactive power in a fault association domain, a protection principle module realizes construction of protection action quantity and braking quantity based on the fault component reactive power, a protection motion characteristic module determines and identifies the fault association domain according to protection action. The fault correlation domain identification system can respectively acquire accurate determination results during occurrence of each types of faults in and out of the fault correlation domain, has sensitive and reliable protection performance, not only realizes an electrical network remote backup protection function under a common condition, but also successively solves a problem of protection difficulty under a condition of direct current disappearance of a transformer station and further improves electrical network security.

The invention discloses a seamless grid-connected inverter with a grid-connected point dynamic voltage compensation function and a method thereof, and belongs to the technical field of grid security. The seamless grid-connected inverter comprises an input module, a direct current power supply, a transformer, a voltage and current detection module, a voltage deviation calculation and voltage compensation control unit, an inverting control unit and an inverting module. Before grid connection, the inverting control unit controls the inverting module through an excitation instruction operation module to output an idle component for pre-excitation of the transformer; after grid connection, voltage compensation currents are output through the voltage deviation calculation and voltage compensation control unit, the voltage compensation currents and idle reference currents are superposed to obtain new idle reference currents, the grid-connected inverter is controlled to absorb or sent out idle currents, grid-connected point voltage is recovered within the voltage deviation range, and safe seamless grid connection of the grid-connected inverter is achieved accordingly. Seamless grid connection of the inverter can be achieved, over-current impact is prevented, system loss is reduced, and system reliability and stability are improved.

The invention relates to a safety and stability analysis method for a power grid. The method comprises steps as follows: sensitivity calculation, risk result analysis, risk prevention and control and risk rating. The safety and stability analysis method has the advantages as follows: with adoption of the analysis method, all sets of failure equipment are sequenced through sensitivity calculation, a risk value of each risk source is given out, risk prevention and control are performed, the risk grade is given out according to regulations, and an important basis is provided for safety and stability analysis of the regional power grid; compared with a conventional analysis method, the analysis result is good, risks of the power grid can be well analyzed and assessed, risk rating by an operator and operation overhaul by the operator are facilitated, and the safety operation of the power grid is improved.

The invention relates to a power grid security risk prediction method. The method comprises steps that screened network security posture factors are processed; security posture state classification standards are determined; a hidden Markov model is constructed according to actual power grid conditions; hidden Markov model parameters are updated according to present security posture of equipment; security posture of an integral electric power network is calculated; a prediction risk value of the equipment and a weight prediction risk value are calculated. Through the method, the network security posture factors are deeply researched, the factors having greatest influence on the security posture are screened out, data processing workload is reduced, model training is carried out through utilizing the data relevant to the security posture factors, a problem of over-hugeness of a hidden Markov transition matrix is effectively alleviated, moreover, problems of non-high prediction precision and parameter determination difficulty are alleviated.

A reliability design approach of the power pool safe stable coordination defense system includes a control framework with the site population and function division, wherein the control framework includes a dispatching center station, a control main station, a control sub-station and a control execution station, the control sub-station and the control execution station realize the regional control; and the control main station take charge of the coordination of each regional control; the dispatching center station take charge of the computation of the online control strategy and the online coordination control between the main control stations. The invention effectively solves the reliability problems of the coordination defense system caused by the device, the communication and the software and the like; the online control framework of 'site population and function division' avoids the paralysis of the whole system caused by the local device and the communication failure, advances the whole reliability of the coordination defense system; the computing device and the control device adopt the redundant configuration, which enhances the local reliability of the system; the coordination control system adopts the online and the off-line operation mode switching mechanism, which advances the operation reliability of the system.