A kind of AGC optimal control method of power system with dfig

Abstract

The invention discloses a power system AGC optimization control method including DFIG. The DFIG is taken as a negative load into each control area of ​​the power system AGC. The DFIG includes a droop control link and a speed controller; the output of the droop control link is obtained respectively Respond to the output power of the speed controller, and calculate the total active power that DFIG needs to output; establish an objective function, use the PSO-GSA algorithm to solve the objective function, and obtain the fitness value of the PSO-GSA algorithm; judge whether the end condition is met, and if so, then At the end of the optimization process, the optimal solution of the parameters to be optimized is obtained; the optimal solution of the parameters to be optimized is given to the power system AGC, and by responding to changes in the frequency of the power system, DFIG participates in the secondary frequency regulation of the power system AGC. The invention can improve the frequency modulation pressure of the traditional synchronous generator, optimize the AGC control, improve the dynamic response performance of the power system, and improve the stability of the power system.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an AGC optimization control method of an electric power system including DFIG. Background technique [0002] A large power system is composed of several regional power systems interconnected through tie lines. Each regional power system performs power exchange according to a predetermined plan. The sum of the load, line loss and tie line net exchange power of each regional power system must be equal to that of the area The power generation output is equal. [0003] The automatic generation control (Automatic Generation Control, AGC) between the regional power systems generally adopts the net exchange power deviation and frequency deviation control method of the tie line, and each control area adjusts the power generation output according to its area control error (Area Control Error, ACE) to solve the problem. Frequency regulation and load distribution problems in ...

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Problems solved by technology

[0004] However, domestic and foreign research on AGC mainly focuses on two-region non-reheating thermal power interconnection and multi-region hydrothermal power systems. In addition, when the parameters of the PID controller of the power system AGC are optimized, the convergence speed is slow and easy to occur. stuck in a local optimum

Therefore, the existing power system AGC has problems such as high frequency modulation pressure of synchronous generators and low dynamic frequency stability of the power system, which in turn affects the safe and stable operation of the power grid.

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