513 results about "Tie line" patented technology

Systems and methods for connecting and configuring a communication network are described. A network includes a first router; a tie-line having a plurality of full duplex dedicated router interconnects connected to said first router; a second router connected to said plurality of full duplex dedicated router interconnects; a first user connected to said first router with a first full duplex loop; and a second user connected to said second router with a second full duplex loop. The systems and methods provide advantages in that bursty control information can be multiplexed with time sensitive laminar data.

A method of manufacturing a lead frame includes providing an electrically conductive layer having a plurality of holes at a top surface. The plurality of holes form a structure of leads and a die pad on the electrically conductive layer. The plurality of holes are filled with a non-conductive material. Next; an electrically conductive foil is attached on the top surface of the electrically conductive layer and the non-conductive epoxy material. Then, the electrically conductive foil is etched to create a network of leads, die pad, bus lines, dam bars and tie lines, wherein the bus lines connect the leads to the dam bar, the dam bar is connected to the tie line and the tie line is connected to the die pad.

The invention relates to a multi-time-scale power system robustness scheduling system design method. The method includes: dividing a scheduling frame into three time scales: a day-ahead plan, a within-day rolling plan, and a real-time plan, and building a scheduling system; drawing the day-ahead plan based on next-day load prediction data and short-term prediction data of new energy on the basis of a known set initial state, a tie-line exchange plan, and the switch state of the day; drawing the within-day rolling plan based on ultra-short-term load prediction and ultra-short-term new energy power prediction with higher prediction precision on the basis of the day-ahead plan; and drawing the real-time plan based on the within-day rolling scheduling, and further correcting deviation of the scheduling plan and a predicted result. The method is advantageous in that the scheduling mode with multiple time scales is employed to gradually reduce the impact on the power grid by the uncertainty of the new energy, the robustness scheduling mode is employed in the day-ahead plan and the within-day rolling plan, and the robustness of the scheduling scheme is high.

A method and system include screening and routing telephone calls, generating calling data reports and discounting billing for a customer's wide area centrex / PBX network, which includes an abbreviated dialing plan. A service control point (SCP) determines whether to block an outgoing call based on stored blocking tables and a privilege class of the calling station. The SCP determines whether to route the call through a private trunk group from a host switch to a private facility, and through an alternative trunk group when the private trunk group is unavailable. The SCP determines whether the call is eligible for discounted billing and generates a billing record, which is modified by a service switching point to indicate the discount. The SCP also samples calling data from service switching points and transmits the sampled data to a front end processor for formatting into station message detail recording (SMDR) data.

The invention discloses a parallel partition electromagnetic transient digital simulation method of an AC and DC power system. The method comprises the following steps of: partitioning a target AC and DC power system into a plurality of subnets comprising an AC network subnet, a current converter subnet, a DC network subnet or an AC and DC mixed network subnet; acquiring equivalent impedance matrix and equivalent potential at port point of each subnet; acquiring current of the tie-line between the subnets; acquiring node voltages of each subnet according to the current of the tie-line between the subnets; solving differential equations of a generator, a control system, and the like of each subnet; processing a user self-defined model, an MATLAB model and input and output information of a physical device; processing input and output information of an electromagnetic transient interface. The simulation method has the advantages of flexible net partition mode, high computation speed, and the like. The simulation method can be simultaneously suitable for electromagnetic transient net partition parallel computation of an AC and DC system, parallel computation of electromechanical transient, accessing a user self-defined model, processing an MATLAB model and a physical device and the like, thereby realizing digital simulation of various transient and dynamic processes of the AC and DC power system.

A method and system include routing telephone calls from multiple private networks via public lines and trunks in a public switched telephone network (PSTN) to a host switch, at which the connections would begin to run parallel. The host switch routes the telephone calls via a private trunk group to a private facility, such as an electronic tandem network (ETN) node or an asynchronous transfer mode (ATM) switch. If the private trunk group is full or unavailable, the host switch routes the telephone calls over alternate private or public trunk groups and selected carriers.

The invention relates to a multi-region asynchronous coordination dynamic economic dispatching method based on a robustness tie line plan, and belongs to the technical field of operation and control of a power system. The method comprises the steps of firstly, establishing a multi-region asynchronous coordination dynamic economic dispatching model based on a robustness tie line plan in consideration of wind power uncertainty, wherein the established model is a two-phase robustness optimization model, and the model is composed of a target function and a constraint condition; and then converting the established multi-region asynchronous coordination dynamic economic dispatching model into a matrix expression, solving the model by adopting a solution algorithm based on a constraint-column generation method, and performing economic dispatching by using the result. The peak-load regulating capacity of different regions of a grid is sufficiently developed in consideration of wind power uncertainty, so that the method adapts to quick fluctuation of wind power and can effectively reduce abandoned wind.

The invention relates to a flexible tie-line structure between the integrated circuit board among fingers of the robot. One end of a second flexible drop-out line (1-3) is connected with a first rigid plate (1-2), and the other end is connected with a second rigid plate (1-4). One end of a fourth flexible drop-out line (1-7) is connected with a second rigid plate (1-4), and the other end of the fourth flexible drop-out line (1-7) is connected with a finger rigid circuit board (2). One end of the base joint lamp cord (3) is connected with the finger rigid circuit board (2), and the other end is connected with the fourth rigid plate (4-1). One end of a fifth flexible drop-out line (4-2) is connected with the fourth rigid plate (4-1) and the other end is connected with the base joint rigid circuit plate (5). The invention has features of reasonable circuit board layout and wire distributing way, not influencing the movement of joint, and good adaptability of finger tie-line to cradle head.

The invention relates to a generation method for the future-state alternating-current flow of a power grid. The method comprises the following steps: (1) selecting a real-time running section of the power grid as an initial section; (2) obtaining generation plan data of the power grid; (3) obtaining overhaul plan data of the power grid; (4) obtaining predicted data of a busbar load; (5) obtaining connecting line plan data; (6) driving one-time flow calculation of the power grid; (7) calculating a power deviation value of a connecting line; (8) correcting load injection; (9) driving one-time flow calculation of the power grid; (10) setting each generator participating in adjusting the state as an initial set value which is obtained from rated parameters of the generator; and (11) storing the section of the power grid after the adjustment is finished, and successfully generating the future-state flow. According to the method disclosed by the invention, the future predication and plan data of a generation plan, an overhaul plan, a connecting line trade plan, busbar load predication data and the like are adequately considered, the adjustment is automatically finished, and the future-state alternating-current flow is generated on the basis of the real running section of the power grid; an accurate future-state predicated flow result is provided, thus providing complete basic flow data for plan security check.

The invention provides a comprehensive energy system multi-objective operation optimization method considering an electric heating gas network. The comprehensive energy system multi-objective operation optimization method comprises the steps that a comprehensive energy system sub-network model comprising a natural gas network, a power network and a thermal network is established according to the obtained comprehensive energy system main information; then, an integrated energy system typical coupling equipment model comprising an electric boiler, a combined heat and power system, an afterburning type biomass boiler and a solar heat collector is established; secondly, on the basis of the maximization of the economic benefits and the environmental benefits, a multi-objective operation optimization model is established, and the comprehensive energy system operation constraint conditions including the coupling equipment operation constraints, the tie line power exchange constraints and thesub-network operation constraints, are set; and finally, the multi-objective operation optimization model is solved, and the main information of the comprehensive energy system is outputted. Accordingto the method, the effectiveness of the model and the method on the comprehensive energy system operation optimization is verified through the example analysis, and the reference can be provided forthe multi-objective operation optimization of the comprehensive energy system.

The invention includes screen cabinet and current detection return circuit and control circuit set on the screen cabinet. Its technical key point: control circuit includes voltage detection return circuit; on-off closed return circuit; starting loop and backup power automatic switch control return circuit. The said current detection return circuit consists of ten loops at most. Each loop collects one current analog quantity, therein, two analog quantities are used for two main transformers to detect non-current latching; two analog quantities are used for representing the two main transformers overloading; the other analog quantities are used for reflecting less than six connecting lines overloading after outomatic switching. The realization of varies backup power automatic switching in arrangement is along with one change of system running mode to automatic change its automatic switching mode. It resolves the configuration problem of 220KV power substation backup power automatic switch device.

The invention discloses an economical optimized scheduling method for combined supply of cooling, heating and power type multi-microgrid active power distribution system. The method comprises the steps that optimized modeling is firstly carried out on local scheduling layer wind power generation and energy storing device combined power generation; an optimized result is uploaded to a regional scheduling layer composes of a plurality of combined supply of cooling, heating and power type microgrids and active power distribution networks; and then, various equipment in the combined supply of cooling, heating and power type multi-microgrid are analyzed, and an economical optimized scheduling model is built; the economical optimized scheduling model for the active power distribution network isbuilt; finally, tie line electric power interactive values of the combined supply of cooling, heating and power type multi-microgrid and the active power distribution system are taken as coupling variables, and conditions of convergence are set when two interest body optimized scheduling is solved in parallel; Cplex is called in MATLAB to solve a problem, and a scheduling plan is acquired. The economical optimized scheduling method provides an effective, practical and scientific energy optimized scheduling method, and the promotion and application of energy conservation are facilitated.

The invention discloses a method for modeling an automatic power generating control model in power system stimulation, which models an automatic power generating control system by considering the control mode and the control performance evaluation standards in the automatic power generating control and the algorithm characteristics of power system stimulation. Meanwhile the invention discloses a method for implementing an automatic power control model in power system stimulation. The model can stimulate the three modes of constant-frequency control, constant-exchange power control and tie-line power and frequency deviation control in automatic power generating control, and simultaneously achieves the three control performance evaluation standards of A1 / A2, CPS1 / CPS2 and T of automatic power generating control; regions adopt different control strategies according to different region control performance evaluation standards, so that the model can analyze the influence of automatic power generating control in the long-term dynamic stimulation in a power system, and the requirement of the simulation of of the whole process of electromechanical transient and electromechanical medium and long-term dynamic state of the power system are met.

The invention discloses a multi-objective optimization system and a multi-objective optimization method containing a composite energy storage micro grid. The multi-objective optimization system containing a composite energy storage micro grid is composed of a micro grid central controller, an energy storage controller, a photovoltaic controller, a load controller, and a communication network. According to the multi-objective optimization method containing a composite energy storage micro grid, a multi-objective optimization model is established for a grid-connected composite energy storage micro grid including photovoltaic batteries, flow batteries, lithium batteries and other energy storage devices, with the purpose of minimizing micro grid electricity purchasing cost and tie line power fluctuation. The weighting coefficient is determined based on a two-person zero-sum game method, and the model is converted into a single-objective optimization problem and solved using a linear weighted method. By adopting the multi-objective optimization system containing a composite energy storage micro grid, the utilization rate of renewable energy of the micro grid can be maximized effectively, tie line power fluctuation and distributed power supply grid-connected operation shock can be reduced, and the economical efficiency of micro grid operation can be improved.

The invention discloses a distributed optimal operation method considering the uncertainty for an active distribution network, which comprises the steps of firstly, building an uncertainty model of photovoltaic output by using a robust optimization method in consideration of the uncertainty of the photovoltaic output; secondly, building an optimal scheduling model of the active distribution network, wherein the model takes the minimum operation cost as an objective function and comprehensively considers power flow constraints, safe operation constraints and output constraints of adjustable andcontrollable resources; then building an optimal scheduling model of multiple microgrids connected to the distribution network, wherein the model takes the minimum operation cost of the microgrids asan objective function and adds the problem of renewable energy consumption serving as a penalty function to the objective function; and modifying the distribution network model and the microgrid model based on a Lagrange function in consideration of a coupling relationship between the distribution network and the microgrids in tie-line power so as to build a distributed optimal scheduling model of the active distribution network.

The invention discloses an event trigger load frequency control-based method of a multi-zone interconnected power system. The method comprises the steps of (1) building a mathematical model for load frequency control of a multi-energy power system; (2) researching an even trigger condition design of the load frequency control of the multi-zone interconnected power system on the basis of an event trigger mechanism; and (3) designing an event trigger-based controller. The system directly enters a sliding mode state from the beginning and a sliding mode exists in the overall control system; and for a sliding mode control system, after the system enters the sliding mode state, the dynamic property of the system is completely determined by the sliding mode state. The control method has the desired dynamic characteristic and has complete robustness on change of system parameters and external disturbance; and buffeting is eliminated. Due to use of the event trigger mechanism, the multi-energy power system can effectively inhibit dynamic frequency deviation and dynamic deviation of tie-line power and effectively reduce the network bandwidth occupancy.

The invention relates to a calculation method suitable for tie-line transient state stable limiting transmission power. In the method, the transient state stable limiting transmission power just in one step through calculating the obtained accident static state stable limiting transmission power and the tie-line fault impact power. The calculation method provided by the invention has the same model applicability as the time domain simulation method and the same stability margin quantification as the direct method, the accuracy is higher, and the operation is convenient. The method can be used for calculating the estimated value of the transient state stable limiting transmission power, and has wide application range in the offline calculation, especially in the online application.

The invention discloses a post-disaster repair decision-making method and device for power distribution network. The method comprises the steps of collecting fault information distribution transformerlevel disaster damage information,first-aid repair teams and material transport vehicle information under disaster conditions; on the premise of meeting the distribution network operation constraintand the path planning constraint,using distribution network fault point selection and first-aid repair teams and material scheduling as decision variables,establishing a power distribution network frame reconstruction and material personnel allocation auxiliary decision-making model,wherein the model comprises a lower tie line action scheme determination model taking the maximum recovery load as atarget and an upper construction team and material scheduling scheme determination model taking the minimum total power loss in the rush-repair process as a target; and solving the dispatching auxiliary decision-making model by adopting an upper-lower layer iterative solving method,and finally determining a post-disaster repair decision-making scheme of the power distribution network. According to the method,the problem that the target of minimum economic loss cannot be achieved due to the cooperative action of a construction team and a material vehicle is fully considered,and decomposition codes of all parts are simplified.

An assessment method for online acceptance capacity of new energy power generation includes determining an objective function and various constraint functions, building an assessment model according to the objective function and the constraint functions, and through input of online data, calculating grid acceptance capacity of each new energy power generation station and the sum of capacities of accepting all the new energy power generation stations by a grid. According to the built assessment model, not only top and bottom bound restrictions of tie line power and unit output but also wire frame and peak regulation restrictions are considered, and the acceptance capacity, with the installed capacity as the highest limiting value, of each new energy power generation station is calculated, so that policy requirements on full acceptance of new energy power generation are met, safety factors of the grid is considered, and safe and stable operation of the grid is guaranteed.

The invention provides a regional integrated energy system energy storage configuration method considering an electric / thermal flexible load, and the method comprises the steps: firstly comprehensively analyzing the composition of the electric load and the thermal transmission characteristics of a heat supply system, and building an electric / thermal flexible load model; then, on the basis of the architecture of the known regional integrated energy system, establishing a model of each energy assembly, meanwhile, setting constraint conditions, including energy balance constraint, energy assembly output constraint, tie line transmission power constraint and energy storage constraint; secondly, considering system energy consumption, investment, operation and maintenance and compensation cost, and establishing an economic single-objective optimization model; and finally, based on the LINGO18.0 software, solving the established energy storage optimal configuration model to obtain the optimal output of each device and the optimal capacities of the storage battery and the heat storage tank. According to the method, the regional comprehensive energy system is subjected to energy storage optimization configuration, and the energy utilization efficiency is improved.

The invention discloses a method for establishing an optimal response model of an electro-thermal coupling microgrid by comprehensively considering reliability and economy. The electro-thermal coupling microgrid comprises a microgrid, a heat supply network and an electric boiler. The microgrid comprises an electric load, an electric energy bus for supplying power to the electric load, distributedphotovoltaics, an electricity storage device and a tie line connected with a superior power grid. The heat supply network comprises a heat energy bus, a heat load and a heat storage device. The electric boiler is connected with the electric bus and the heat bus. The method comprises the following steps: S1, establishing an output model of each element in the electro-thermal coupling microgrid; S2,establishing an electric heating combined response mechanism; S3, evaluating the reliability and economy of the electro-thermal coupling microgrid based on the electro-thermal joint response; S4, establishing an electricity-heat joint response model by taking the optimal comprehensive benefit as a target; and S5, solving the electro-thermal joint optimal response model based on a genetic algorithm. The method has the advantages that the electricity-heat joint optimal demand response comprehensively considering the reliability and the economy is realized. The maximization of the comprehensivebenefit of the electricity-heat coupling microgrid is realized.

The invention discloses a regional electric power capacity market model design and pricing method considering cross-region tie-line constraint. The method includes: determining the peak load level within a capacity market operation period according to a result of long-term load prediction of a power grid, and determining the capacity demand required by each region in the whole grid according to the reliability requirement of a system; dividing the system into regions to overcome the difficulty that the capacity cannot be called due to blocking of cross-region tie-lines in the capacity market, and establishing a capacity market optimization model which regards the minimum cost of the total capacity as the target and considers regional capacity demand balance; and solving the optimization model to obtain the optimal capacity purchase amount of each region and a multiplier corresponding to the capacity balance constraint of each region, wherein the multiplier represents the capacity price of each region. According to the method, the capacity price of each region, which considers the cross-region capacity constraint, can be given, price signals are provided for the capacity market, the investment of the power grid can be guided through the market, and certain references are provided for long-term planning work of the power grid.

The invention relates to the field of hydropower generation and dispatching, and discloses a long-term joint peak regulation dispatching method for trans-provincial interconnected hydropower stations. The technical scheme is as follows: a multi-objective optimization model of hydropower stations is set up with the goal of maximizing the amount of power generation and minimizing the peak-valley ratio of a typical day in the dry season, by the use of trans-provincial and trans-regional interbasin hydrological characteristics and the regulation performance difference among power supplies, the power stations are grouped according to an output interval of each power station and the calculation sequence of the power stations is coordinated by stages; and the optimal water level process of sending and receiving end hydropower stations is optimized by using a step by step optimization and dynamic planning successive approximation coupling algorithm and a sending end faced load is reconstructed according to transmission restriction constraints of a trans-provincial DC tie line, the output process of the typical day is determined by a successive load shedding strategy, and a long-term power distribution scheme of the hydropower stations and the electric power process of the typical day in each month are obtained through iterative optimization. The method of the invention can make full use of compensating regulation characteristics of the sending and receiving end hydropower stations, effectively responds to the long-term power demand of a power grid and the short-term peak regulation demand, and meets the actual needs of the trans-provincial and trans-regional dispatching of a giant hydropower station.

The invention provides an auxiliary frequency modulation method for cluster temperature control loads to participate in power network AGC. The dynamic characteristics of temperature control loads anduser comfort are analyzed to evaluate the adjustable capacity range of cluster temperature control loads; according to the different intervals of Area Regulation Requirement (ARR) signals, the coordinated control principle of dynamically distributing the AGC secondary frequency modulation demand to the conventional generating unit and the temperature control load is formulated, the operation timeof auxiliary frequency modulation of the temperature control loads, the operation depth and specific operation mode are determined so as to make full use of the performance advantage of temperature control load without affecting the comfort of users, reduce the frequency modulation pressure of conventional units, speed up the frequency regulation speed, restrain the power fluctuation of tie line of interconnected power network, and effectively improve the frequency modulation effect of power network.

The invention discloses an AC / DC interconnected power grid continuous power flow model with a VSC-MTDC. The main steps comprises the steps of (1) establishing a power flow model of a multi-terminal flexible DC and AC transmission systems, (3) establishing a control model of interconnected section transmission active power of the AC transmission system and the DC transmission system, (4) establishing an AC and DC interconnected power grid power flow model considering an interconnected section transmission active power constraints, (5) calculating the sensitivity K(g)<1> of all generator outputactive power to AC tie line transmission active power and determining an AGC unit and a unit of parameter load power incremental allocation according to the safety margin of the tie line transmissionactive power and K(g)<1>, and (6) obtaining a continuous power flow calculation result through four links of parametric equations, prediction, correction and step length adjustment. According to the AC / DC interconnected power grid continuous power flow model provided by the invention, an interconnected section active power market transaction constraint, a tie line transmission active control behavior and flexible DC power transmission system control mode are accurately simulated, and an effective guarantee is provided for the safety analysis and planning design of the power system operation.

The invention relates to a microgrid economic optimal operation design method with a demand response included. The method comprises the following steps: 1) a microgrid optimal design database is built; 2) an optimization model is built, wherein the objective function for the optimization model is the minimum total cost of the microgrid operation, and constraint conditions comprise a power balance constraint, a controllable unit output constraint, a controllable unit ramp constraint, a tie line transmission power constraint and a controllable load capacity constraint; 3) the input variable parameter value needed by the optimization model is acquired from the microgrid optimal design database, an improved genetic algorithm based on chaos optimization is adopted to solve the optimization model, and output data of a decision variable of the optimization model are acquired; and 4) the total microgrid operation costs under all scenes are compared according to the output data of the decision variable, and the optimal scene and the corresponding interruptible load optimal control strategy can be acquired. Compared with the prior art, the method of the invention realizes more reasonable, more economic and more efficient mircrogrid energy utilization from aspects of a demand side and management operation.

The invention belongs to the field of power systems and provides an FDIR (fault detection, isolation and reconfiguration)-based fault diagnosis method for a power system. In the invention, firstly seven faults, namely a main transformer backup fault (B1 type), a main transformer no-backup fault (B2 type), a bus backup fault (M1 type), a bus no-backup fault (M2 type), a tie line backup fault (L1 type), a tie line no-backup fault (L2 type fault) and a power station fault (PP type fault) are defined; a network result analysis reasoning model is provided to judge whether the system is disconnected, and then a fuzzy qualitative reasoning model is provided to judge whether a power grid is instable; and when the two methods cannot be used for judging the system faults in the system, a new method is required for judging the faults of the power grid, therefore a fault diagnosis method based on multi-factor fuzzy qualitative reasoning is provided, wherein the main points of fault diagnosis method based on multi-factor fuzzy qualitative reasoning are as follows: the failure characteristic of each fault has multiple aspects; and the failure characteristics of different faults cannot be completely same.

The invention discloses an alternating current and direct current coordination control method improving the system stability, and belongs to the field of electric power system operation control. The method comprises the steps of carrying out quadratic polynomial curve fitting on the power of a connecting line after smoothing and stopping are carried out on the power of the connecting line under the condition that an alternating current and direct current series-parallel power grid goes wrong, judging whether the power increase condition or the power decrease condition is met and then increasing or decreasing the direct current power. Meanwhile, the effect is more remarkable with cooperation with an additional PSS4B excitation controller. According to the alternating current and direct current coordination control method, the regional power balance relation in the swinging process of a generator set can be effectively controlled, power angle swinging can be restrained, generator tripping can be reduced, and the transient stability level and the dynamic stability level of an alternating current and direct current system can be increased.