Virtual synchronous generator frequency control method

Abstract

The invention discloses a virtual synchronous generator frequency control method, and relates to the technical field of power systems specially suitable for specific application. The virtual synchronous generator frequency control method is based on improved ant lion algorithm optimization, and comprises the following steps: building a mathematic model of a virtual synchronous generator controller; establishing an optimization objective function of the frequency deviation minimization problem of the power system, optimizing a value interval of a constant omega changed along with the number ofiterations in an improved ant lion algorithm, and optimizing parameters in a virtual synchronous generator controller transfer function by adopting the improved ant lion algorithm; establishing a windpower generation, photovoltaic power generation and load simulation model, and establishing a power system simulation model; under different power system inertia conditions, connecting the power system with a step load and a random change load, and comparing with the traditional control; and displaying the parameter optimal value and the comparison result of the virtual synchronous generator controller. The problems of low inertia and poor frequency stability of the power system due to access of new energy to the power system are solved.

Description

technical field [0001] The technical solution of the present invention belongs to the technical field of electric power system, specifically a method for controlling the frequency of a virtual synchronous generator. Background technique [0002] With the rapid development of new energy and distributed power, the cleanness and high efficiency of electric energy have brought great potential for the development of wind energy storage and other energy sources; distributed power is connected to the grid through grid-connected inverters, forming a synchronous power generation In the mode where the generator is connected to the grid, due to the power electronic characteristics, it will be more flexible than the synchronous generator, but it lacks damping characteristics and inertia characteristics, so that the power system will lose stability. [0003] Power system stability refers to the ability of the power system to maintain stable operation after being disturbed by an accident;...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a virtual synchronous generator frequency control method. The traditional inverter control method cannot provide inertial support to the power grid, resulting in a reduction in the inertia of the renewable energy system and being more susceptible to disturbances. The system In the case of reduced security, a virtual synchronous generator controller model is established, and the virtual synchronous generator rotor can make the virtual synchronous generator have virtual inertia and virtual damping characteristics, and enhance the anti-disturbance ability of the renewable energy system; Combining the generator control method with the improved antlion algorithm, a virtual synchronous generator control method based on the improved antlion algorithm optimization is proposed; the frequency regulation performance of the virtual synchronous generator controller is affected by the parameter K 1 、K 2 and K 3 Impact, K 1 with K 2 are the primary frequency modulation gain and the secondary frequency modulation gain of the virtual synchronous generator, K 3 is the integral link gain of the virtual synchronous generator; the improved antlion algorithm is used to optimize the parameters of the virtual synchronous generator controller, so that the control effect of the virtual synchronous generator controller is better; finally, under different inertial conditions of the power system, respectively Step loads and randomly changing loads are connected to the system, and compared with traditional control, it is verified that the present invention can solve the problems of low inertia of the power system and poor frequency stability of the power system caused by the access of renewable energy to the power system. Increased penetration of renewable energy in the power system

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