A game model-based optimization method and device for a frequency-stable load shedding strategy

Abstract

The invention discloses a frequency stability load shedding strategy optimization method and device based on a game model, and belongs to the technical field of power systems and automation thereof. The method comprises: on the basis of obtaining active power vacancy and cuttable load information, providing a load shedding priority and load loss cost calculation model; establishing a non-cooperative game model for representing a behavior of pursuing load loss cost minimization by each load user; converting the non-cooperative game of the multi-load users into a load shedding multi-objective optimization problem under a load shedding quantity accuracy constraint condition, and establishing a load shedding control optimization model based on the multi-load user game; and finally, solving anoverall optimal solution of the load shedding control multi-objective optimization model by adopting an NSGA-II algorithm. According to the method, the load shedding strategy which meets the requirement of the control quantity, is small in user loss and is flexible to control can be optimized and analyzed, and the purposes of benefit balance and accurate load shedding quantity among load users areachieved under the condition that normal operation of important loads is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method and device for optimizing a frequency-stable load shedding strategy based on a game model. Background technique [0002] my country's power system has formed a high-voltage direct current large-capacity, long-distance power transmission pattern, with a high proportion of new energy power. In the receiving end power grid, traditional power sources are replaced by direct current and new energy. weaker. Once faults such as UHV DC blocking or simultaneous blocking of multiple DC circuits occur, it is very likely to cause large fluctuations in the frequency of the power grid, and in severe cases, it may induce cascading failures and cause large-scale power outages. In order to prevent frequency instability under severe faults, partial load removal is unavoidable. Among them, load shedding control can accurately an...

AI Technical Summary

Problems solved by technology

Some existing research considers the loss of users relatively complicated, and often needs to consider various factors such as national economic production, social stability, openness and fairness, and proposes a load-shedding method that takes priority into account, although it can guarantee special power loads. However, the order and amount of load shedding in each round in the existing priority-based shedding method is preset, and it cannot be adjusted adaptively when different power shortages occur, which often results in over-cutting or under-cutting

There are also some studies that start from obtaining the most accurate load shedding effect, abstract load shedding as a single-objective or multi-objective optimization problem, and use greedy algorithm, genetic algorithm and other methods to solve it, so as to obtain a shedding scheme that is almost consistent with the target power of load shedding. However, the importance of special power loads such as military and hospitals is ignored

There are also some studies aimed at the realistic problem that each load user competes with each other to reduce their own losses, abstracting each power load into a subject with decision-making ability, and using the game principle to analyze the load user's strategy and equilibrium solution in the process of load shedding, This analysis method can obtain a better solution agreed by all parties, but in most cases it cannot obtain an optimal solution set considering multiple objectives

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