36 results about "Energy margin" patented technology

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.

An optical approximate correction method comprises the following steps: graphs with prohibiting intervals are determined; indention convexes in complex number or rectangle convexes in complex number are formed on two sides of each graph with prohibiting distance; assistant scattering belts in complex number are inserted between the graphs with prohibiting intervals. A light mask pattern which is approximately corrected by optical method can form the graph with high resolution ratio, big focusing depth and big energy margin.

The invention discloses a hybrid power vehicle SOC preserved energy management method, and relates to a management method. The hybrid power vehicle SOC preserved energy management method comprises the steps of calculating demanded driving power; calculating demanded battery power; determining an engine working point; determining an electric generator working point; determining a motor working point. According to the hybrid power vehicle SOC preserved energy management method, starting by keeping the battery SOC at a higher level, energy managing and distributing are conducted to make a battery have higher power and energy margin, so that a motor can assist the engine at a larger power and longer time under the working conditions that large driving power is needed by fast acceleration and the like, and a higher dynamic performance index of a heavy vehicle is achieved; on the premise that basic requirements such as fuel economic efficiency and vehicle drive are met, the proposed control strategy realizes the function of series-parallel hybrid system energy management and expected battery SOC retentive goal.

A memory device, and method of operation, 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 the data being stored (lower energy margins for data being stored for shorter periods of time) to save energy and wear.

The invention discloses an energy optimization method for soft landing and obstacle avoidance of a small celestial body, and belongs to the technical field of deep space exploration. The energy optimization method for soft landing and obstacle avoidance of the small celestial body comprises the following steps that energy consumption serves as an optimizing index, small celestial body soft landing energy optimal guidance law is obtained, and on the basis of the energy optimal guidance law, obstacle avoidance guidance law is obtained by adjusting time parameters; according to the obstacle avoidance guidance law, it can be ensured that in the landing process, a prober does not crash into the surface of the small celestial body, and meanwhile, energy consumption in the obstacle avoidance process is reduced to a large extent; and greater energy margin is provided for soft landing of the small celestial body, and safe implementation of tasks is ensured. According to the energy optimization method for soft landing and obstacle avoidance of the small celestial body, a landing device can effectively avoid obstacles, meanwhile, energy consumption is saved, and enough energy margin is ensured for soft landing of the small celestial body.

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 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.

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 invention discloses a closed-loop control method for controlling the output energy margin of a solar array, which relates to the field of autonomous management of on-orbit energy of a satellite power supply subsystem. The method comprises the following steps: 1, a satellite coordinate system OXYZ is established; 2, a solar array on the satellite is set to track rotation of the run at an angular velocity omega0 around the Y axis; 3, the lagging angle of the initial solar array is set to be alpha; 4, the output power psa of the solar array in a solar irradiation area at a previous moment iscalculated; 5, the energy margin Wsp of the solar array in an orbit circle is calculated; 6, the Wsp is judged respectively, and whether the solar array energy margin Wsp is in an energy excessive state or a serious power shortage state or an insufficient output energy state is judged; and 7, the solar array is adjusted to realize closed-loop control on the output energy margin of the solar array.Rotation control of the solar array is incorporated into the allocation process of the satellite energy system, and control on the output energy margin of the solar array is realized.

The invention discloses a method of evaluating the transient stability of a wind farm system considering the influence of a random wind speed. First, an energy function model of the wind farm system is established, a wind speed random process model is then constructed, the wind speed is expressed as a Wiener process, N trajectories of the wind speeds are solved by using a random Euler method, theN trajectories are used as input of system state equations, the N trajectories of each input amount in the energy function are obtained, all input amount trajectories corresponding to each wind speedtrajectory are used as a group, the energy function trajectory corresponding to the wind speed trajectory is calculated according to the energy function model, and finally, the energy margin of the wind farm system under a transient condition is solved by adopting a potential energy boundary method, and transient stability assessment of the wind farm system is completed. The energy function is combined with the random fluctuation of the wind speed in a time domain for constructing the transient stability evaluation index of the wind farm system, and the system transient stability under the random fluctuation of the wind speed is quantitatively analyzed.

One embodiment of the invention discloses a low-orbit satellite double-shaft solar wing control and energy balance coupling calculation method. The method comprises the steps of obtaining solar wing theoretical output power Ps, a beta angle, satellite average power consumption P (flat), satellite illumination area total time Tg, satellite orbit period total time T sum and solar wing shielding area S, wherein the angle beta periodically changes in a range of [-90 degrees, 90 degrees], traversing the angle beta in the range of [-90 degrees, 90 degrees], calculating to obtain an optimal solution of the energy margin, obtaining a control angle a of the solar wing under the condition, combining the a with a coordinate system definition of the solar wing, and proposing a control strategy corresponding to the solar wing under the condition of different angles beta. The average power consumption of the satellite is calculated in a segmented mode in an orbit period, the on-orbit energy balance condition of the satellite is accurately calculated through a program in combination with an on-orbit control strategy of the solar wing, and an accurate basis is provided for design of the solar wing and a storage battery.

The invention discloses a primary frequency modulation wind power cluster control system, method and device. The system comprises a wind power plant power control strategy determination module, a fan AGC active regulation capability determination module and a cluster control module which are connected in sequence. According to the system, the wind energy margin of a single fan can be determined in an aerodynamic mode, and a wind power plant power control strategy is determined based on the wind energy margin; on the basis of the ultra-short-term wind energy margin and the current state of the draught fan, the AGC active power adjusting capacity value of the draught fan is determined; and performing unified coordination control according to the monitoring data of the fan, the reactive compensation data and the AGC active regulation capability value so as to realize closed-loop control of the voltage of the grid-connected point of the wind power plant. According to the invention, a wind-electricity combined control strategy can be realized, external input power of a power grid and output change characteristics and adjustment characteristics of various energy sources of a new energy station are analyzed and researched based on a power transmission center, and a final target is to realize friendly grid connection of new energy sources.

The invention discloses a method and a device for generating vehicle energy filling navigation information. The method comprises the steps: when the current energy margin of a vehicle is smaller thana preset margin value, obtaining the current position of the vehicle; according to the current energy margin of the vehicle, calculating a running distance that the vehicle can run if the vehicle runsin a current running state; acquiring navigation information of a refueling station which is away from the current position of the vehicle within the driving distance; and generating navigation information of vehicle energy filling according to the navigation information of the filling stations within the driving distance. According to the technical scheme, the navigation information of the energy filling station can be pushed to a user by comprehensively combining the current position, the current driving state and the current energy margin of the vehicle, the actual situation of the vehicleis met, and the recommended navigation information is more effective for the user.

The invention discloses an economical efficiency improvement evaluation method for an energy consumption device of an offshore wind power flexible direct current system. The method comprises the following steps: step 1, inputting characteristic parameters of the offshore wind power flexible direct current system, and carrying out data preprocessing; 2, calculating the energy margin of the offshore wind power flexible direct current system; 3, checking the energy margin feasibility of the offshore wind power flexible direct current system; step 4, calculating an economical efficiency improvement index of the energy consumption device under the parallel input strategy; and step 5, calculating the economical efficiency improvement index of the energy consumption device under the serial input strategy. The method has the advantages that the maximum energy margin of the offshore wind power flexible direct-current system is quantitatively evaluated when the alternating-current power grid at the receiving end has the alternating-current fault, and the situation that the economical efficiency of an energy consumption device is improved through the parallel input strategy and the serial input strategy of energy margin energy absorption and resistance energy consumption is quantitatively compared and analyzed so as to determine which input strategy can be adopted.

The invention discloses an enterprise site selection method and device, a computer readable storage medium and electronic equipment. The method comprises the steps of obtaining an energy margin corresponding to an energy supply device of target energy in a target area; obtaining the energy demand of the current enterprise; determining a to-be-selected location of the current enterprise; determining a target energy margin of a target device based on the to-be-selected location and the energy margin corresponding to the energy supply device of the target energy in the target area; and determining a target site selection position of the current enterprise based on the energy demand and the target energy margin. According to the method, the matched energy facilities are analyzed in the earlier stage of site selection, a more reasonable and effective site selection method is provided for enterprises, and the cost and time for unnecessary matched energy facility transformation can be effectively saved.