Fractional order differential compensation type VSG control method

A fractional derivative and control method technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of increasing the order of the system, prone to oscillation, etc., to increase the degree of freedom and improve the dynamic performance. Effect

Inactive Publication Date: 2019-04-19
CHINA THREE GORGES UNIV
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Problems solved by technology

[0003] The virtual synchronous generator control strategy can simulate the inertia and damping characteristics of the synchronous generator, but at the same time the order of the system is increased. In

Method used

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  • Fractional order differential compensation type VSG control method
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  • Fractional order differential compensation type VSG control method

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Embodiment Construction

[0021] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0022] figure 1 It is a virtual synchronous generator (VSG) grid-connected circuit and control model established based on Newton's law of motion, while simulating the rotor motion equation of the synchronous generator and the VSG governor equation (1).

[0023]

[0024] Among them, J is the virtual moment of inertia; D is the virtual damping coefficient; w 0 is the rated voltage angular frequency; w is the VSG output voltage angular frequency; P m is the virtual mechanical power of VSG; P out is the output active power; K m is the adjustment coefficient of the governor; K U is the reactive power droop coefficient; U 0 is the rated amplitude of the output voltage; U d is the output voltage amplitude command; Q 0 for the corresponding U 0 reactive power; Q out Output reactive power for VSG.

[0025] figure 2 is the block diagram obtained...

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Abstract

The invention relates to a fractional order differential compensation type VSG control method, which comprises the following steps: S1. In a closed-loop control loop of VSG grid-connected output active power Pout, a fractional-order differential compensation forward channel is added, wherein the fractional-order differential order is u, so that a closed-loop zero point is added on a closed-loop transfer function G1(s) of the VSG grid-connected output active power Pout, and the position of a closed-loop pole is changed, so as to obtain a closed-loop transfer function G3(s) of the fractional order differential compensation type VSG grid-connected output active power Pout, wherein u is more than or equal to 0 but less than or equal to 1;S2,.An improved biogeography optimization algorithm (IBBO) is used to solve the optimal u, and then an optimal closed-loop transfer function G3(s) is obtained. According to the invention, by adding the closed-loop zero point and introducing the adjustableparameter u at the same time, the contradiction between the dynamic performance and the steady-state performance adjustment of the VSG is decoupled, namely the steady-state performance of the system is ensured to be unchanged, and meanwhile, the degree of freedom of the dynamic performance of the system is increased by changing the position of the zero pole, and the dynamic performance of the active power is improved.

Description

technical field [0001] The invention relates to the field of virtual synchronous generators (VSG), in particular to a fractional order differential compensation VSG control method. Background technique [0002] As more and more distributed power sources are connected to the grid for power generation, more and more inverters and various power electronic devices are connected to the distribution network. Power electronic converters lack inertia, and their fast response characteristics make the system In the case of small disturbances, it is easy to lose stability. The synchronous generator has the advantages of large inertia and high output impedance. In the case of small disturbances, the virtual synchronous power generation technology simulates the characteristics of the synchronous generator and applies control to make the power electronic converter present the external characteristics of the synchronous generator. In order to solve the above problems, scholars put forward...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 张赟宁周小萌席磊陈阳泉
Owner CHINA THREE GORGES UNIV
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