37 results about "Energy margin" patented technology

The invention discloses a hydrogen-electricity hybrid fuel cell bus energy management control method. The hydrogen-electricity hybrid fuel cell bus energy management control method comprises the following steps that vehicle pedal opening data and a SOC value of a power cell are collected; required power of a vehicle drive motor is calculated according to the collected data; a fuel cell power pointis determined according to the required power of the vehicle drive motor, a fuel cell polarization curve and the SOC value of the power cell; start and stop control over the fuel cell is determined according to the SOC value of the power cell; output power of the fuel cell is controlled according to the determined fuel cell power point; and on the basis of ensuring the vehicle drive required power, energy margin of the SOC of the power cell is maintained to the greatest extent, meanwhile, the fuel cell is enabled to work in an area with the optimal efficiency, and it is ensured in a balance interval of the SOC of the power cell, the service life of the fuel cell is prolonged on the basis of meeting the vehicle power performance.

The invention relates to a hybrid power comprehensive control system with a function of collecting and processing analog signals, speed velocity pulse signals and switch signals, a function of storing and running control software, a function of driving a system gear shifting and mode switching operation element hydraulic electromagnetic valve, a function of communicating with CAN buses of other ECUs of a system, a function of communicating with an upper computer and other functions. On the basis of power optimization management and distribution of hybrid power, a battery SOC is kept at a high level as much as possible, the power performance of a vehicle is improved, and the high-power electricity consumption requirement of other systems is met. The comprehensive control system can meet the requirements of signal treatment and control strategies of the vehicle hybrid power system for software and hardware, energy management and distribution are achieved by keeping the battery SOC at the high level through the control software, a battery is made to have high power and energy margin, and therefore an electric motor can assist an engine in a high-power and long-time mode under high-drive-power requirement working conditions such as urgent acceleration.

This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation: <?in-line-formulae description="In-line Formulae" end="lead"?>Xtest=Xspost+0.99(XUEP-Xspost) <?in-line-formulae description="In-line Formulae" end="tail"?> where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.

A multi-legged robot energy margin calculation method considering external force impact interference and damping comprises the following steps that step 1, the rotary movement of a robot is converted to a mechanical rotary system containing spring damping characteristics, and an energy margin expression of the robot is calculated; step 2, a D-H mathematical model under the Cartesian coordinate system is constructed; step 3, relevant parameters required by the energy margin of the robot is analyzed by combining the step 2. Obtained according to gravity position, virtual elastic damping and resultant moment, when the robot walks on complicated road the multi-legged robot energy margin calculation method considering external force impact interference and damping is finally used for judging whether or not the robot is likely to tumble under the effect of external force impact and self inertia moment in order to ensure that the robot walks steadily. Finally, a stable calculation method suitable for multiple terrains and aging is come up with.

This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation:Xtest=Xspost+0.99(XUEP−Xspost)where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.

A power distribution system is dynamically and adaptively configured in real-time to improve energy efficiency, reliability and power quality, particularly if the system includes renewable sources and storages. An optimal multi-objective scheduling and partitioning method is provided to partition the system into self-sufficient sections (SSS) through optimally combination of adjacent basic switching sections (BSS). The SSSs enable system operating at a lower cost, with less power losses, more energy efficiency, improved power quality, and sufficient transient security. The method uses two storage based transient security indices, storage compensation power margin (SCPM) and storage compensation energy margin (SCEM) evaluate the transient stability margin of distribution system. A minimal stability margin is used to ensure that the system remains stable when subject to large unexpected load deviations.

The invention relates to the technical field of electric power system transient stability analysis, and discloses a voltage online coordination control method based on energy margin constraint. The voltage online coordination control method based on energy margin constraint comprises the following steps that (2) a system potential energy function model Ep is built, and an energy margin Em is calculated on the basis of the lie derivative; (2) an approximate linear programming problem is formed by using the energy margin Em as an objective function and using the reactive margin and the voltage allowable change range as constraint conditions; (3) a coordination control strategy is obtained to accomplish coordination of various voltage control modes. According to the voltage online coordination control method based on energy margin constraint, various voltage control modes are brought into a uniform energy function frame, the lie derivative is introduced to calculate changes of the energy margin, the approximate linear programming problem is formed by using the situation that the energy margin is larger than or equal to zero as the objective function and using the reactive margin and the voltage change range as the constraint conditions, and the solution of the approximate linear programming problem serves as the coordination control strategy. According to the voltage online coordination control method based on energy margin constraint, the calculation speed can be increased, generation of the online coordination control strategy of various voltage control modes is facilitated, and the safe operation level of a power grid is improved.

The embodiment of the invention provides a data transmission method and device. The method comprises the steps: terminal equipment determines a first parameter, and the first parameter is power management maximum output power back-off (P-MPR) or energy margin; the terminal equipment sends a first media access control (MAC) control element (CE) according to a logic channel priority of the first MAC control element (CE) carrying the first parameter; wherein the logical channel priority of the first MAC CE is lower than the logical channel priority of a second MAC CE, and the second MAC CE is an MAC CE used for a BSR (Buffer Status Report) except a BSR (Buffer Status Report).

A memory device, and method of operation are disclosed. The device includes an array of non-volatile memory cells and a controller. The controller is configured to perform an operation (e.g. erase, program, etc.) on a first plurality of the non-volatile memory cells using operational voltages with a first energy margin, and perform the same operation on a second plurality of the non-volatile memory cells using operational voltages with a second energy margin that is greater than the first energy margin. The operations of varying energy margins are based on the required storage longevity of thedata being stored (lower energy margins for data being stored for shorter periods of time) to save energy and wear.

The invention discloses a critical cluster identifying method for transient stability analysis of a power system. The critical cluster identifying method comprises the following steps: obtaining a critical clearing time of a fault by using time domain simulation; obtaining a critical stable track and a critical unstable track of the power system according to the critical clearing time; determining a leading unstable balance point according to the critical stable track and the critical unstable track so as to obtain a power angle of each generator at the leading unstable balance point; carrying out simulation according to the actual clearing time of the fault so as to obtain a fault track; calculating the sensitivity of an energy margin to the mechanical power of each generator according to the fault track and the power angle of each generator at the leading unstable balance point; and identifying generators of a predetermined number in the generators, of which the calculation results of the sensitivities are negative values, as the critical cluster. According to the critical cluster identifying method for transient stability analysis of the power system, the critical cluster is identified according to the sensitivity of the mechanical power of each generator based on the energy margin; the identification accuracy is improved; and the situation of misjudgment is reduced.

An optical approximation correction method, comprising: determining a figure with forbidden distance; forming a plurality of jagged or rectangular protrusions on both sides of the forbidden space figure; inserting a plurality of auxiliary scattering bars between the forbidden space figures. The photomask pattern corrected by optical approximation can form a pattern with high resolution, large depth of focus and energy margin.

The invention discloses a method for evaluating the transient stability of a wind farm system considering the influence of random wind speed. Firstly, the energy function model of the wind farm system is established, and then the wind speed stochastic process model is constructed. The wind speed is expressed as a Wiener process, and the random The Euler method solves N trajectories of wind speed, and inputs these N trajectories as system state equations, obtains N trajectories of each input quantity in the energy function, and takes all input quantity trajectories corresponding to each wind speed trajectory as One group, calculate the energy function trajectory corresponding to the wind speed trajectory according to the energy function model, and finally use the potential energy boundary method to obtain the energy margin in the transient state of the wind farm system, and complete the transient stability evaluation of the wind farm system . The invention combines the energy function with the random fluctuation of the wind speed in the time domain, and is used to construct the transient stability evaluation index of the wind farm system, and the quantitative analysis considers the system transient stability under the random fluctuation of the wind speed.

The present invention discloses a power grid transient stability energy function analysis method and system containing a detailed generator model. The method comprises the following steps of: establishing a power system model containing the detailed generator model; determining a failure mode; calculating an angular point CRN; calculating a generator equivalent parameter; solving an accurate controlling unstable equilibrium point (CUEP); and calculating an energy margin according to a system energy difference value of the CUEP and a failure clearing moment. The system comprises apparatuses used for implementing the method. The problem of a relatively large deviation between a transient stability analysis result and an actual situation, caused by a too simplified model in an existing energy function method entering a practical stage, is solved, so that the reliability of power system security analysis can be improved.

The invention relates to a hybrid power comprehensive control system with a function of collecting and processing analog signals, speed velocity pulse signals and switch signals, a function of storing and running control software, a function of driving a system gear shifting and mode switching operation element hydraulic electromagnetic valve, a function of communicating with CAN buses of other ECUs of a system, a function of communicating with an upper computer and other functions. On the basis of power optimization management and distribution of hybrid power, a battery SOC is kept at a high level as much as possible, the power performance of a vehicle is improved, and the high-power electricity consumption requirement of other systems is met. The comprehensive control system can meet the requirements of signal treatment and control strategies of the vehicle hybrid power system for software and hardware, energy management and distribution are achieved by keeping the battery SOC at the high level through the control software, a battery is made to have high power and energy margin, and therefore an electric motor can assist an engine in a high-power and long-time mode under high-drive-power requirement working conditions such as urgent acceleration.