Control Method of Virtual Synchronous Generator Based on Dynamic Virtual Reactance
A generator control and virtual synchronization technology, which is applied in motor generator control, electronic commutation motor control, and generator control, etc., can solve the problem of not being able to suppress the oscillation of the virtual synchronous generator system and reduce the coupling degree of the power dynamic process. , to achieve the effect of flexible transformation and simple implementation method
Active Publication Date: 2019-08-27
HEFEI UNIV OF TECH
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Problems solved by technology
[0009] The technical problem to be solved by the present invention is to solve the problem that the existing virtual impedance control method cannot suppress the oscillation of the virtual synchronous generator system and reduce the coupling degree of the power dynamic process without affecting the coupling degree of the power steady state. A virtual impedance control method that can provide damping for the system without affecting the degree of coupling at power steady state
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[0054] The present invention will be further described below in conjunction with accompanying drawings and examples.
[0055] figure 1 It is a grid-connected structural diagram of a virtual synchronous generator according to an embodiment of the present invention. As shown in the figure, the DC source is converted into AC power through the inverter. The amplitude of the rated output line voltage of the inverter is 380V, and the frequency is 50Hz. The AC power is filtered by the filter inductor and filter capacitor, and then connected to the point of common coupling (PCC) through the line impedance. The specific parameters are as follows: DC source U dc =600V, bridge arm side filter inductance L f =0.06mH, filter capacitor C f =300uF, the line resistance is R g =0.1Ω, the line inductance is L g = 1 mH.
[0056] figure 2 It is an overall control block diagram of the control method of the present invention, as seen from this figure, the steps of the control method of the...
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The invention discloses a dynamic virtual reactance-based control method for a virtual synchronous generator. According to the control method, virtual reactance is designed in a two-phase rotating coordinate system, and traditional steady-state virtual synchronous reactance is designed to be dynamic virtual synchronous reactance in a form of a high-pass filter, so that the oscillation of the virtual generator in a dynamic process is suppressed by using the characteristics that the dynamic virtual synchronous reactance is shown as small reactance in a low frequency band, thereby not affecting the steady-state performance of the virtual synchronous generator, and is shown as the reactance with a constant value at a resonance point, thereby reducing the coupling degree of active power and reactive power output from the virtual synchronous generator in the dynamic process.
Description
technical field [0001] The invention relates to the field of distributed power generation and power electronics technology, in particular to a virtual synchronous generator control method based on dynamic virtual reactance. Background technique [0002] With the increase of new energy grid connection, the inertia and damping of the power system will decrease, and the stability will deteriorate. Virtual synchronous generators (virtual synchronous generators, VSG) technology improves the inertia of the system by simulating the external characteristics of synchronous generators, and has become one of the effective solutions to solve the problem of high penetration of distributed power. The virtual impedance control technology in the virtual synchronous generator can configure the output impedance of the virtual synchronous generator and is widely used in the power decoupling control of the virtual synchronous generator. Through the negative virtual resistance, the coupling degr...
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IPC IPC(8): H02J3/24H02J3/48H02J3/50H02P21/22H02P21/28
Inventor 张兴张行李明刘芳张海峥管玮琪朱虹
Owner HEFEI UNIV OF TECH