Grid-connected resonance analysis method and system based on photovoltaic virtual synchronous generator
A virtual synchronous generator technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problem of rarely considering the influence of virtual synchronous generator parameter stability
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Embodiment 1
[0083] Through the coordination and cooperation of photovoltaic and energy storage, the photovoltaic virtual synchronous generator realizes the function of primary frequency modulation of the system, improves the damping characteristics and interference suppression ability of the system, and has been put into use in large quantities. Compared with the existing traditional virtual synchronous generator, the method of the present invention increases the complexity of the photovoltaic virtual synchronous generator (PV-VSG) system after connecting the energy storage converter, and the large-capacity photovoltaic virtual synchronous generator is connected to the weak grid Finally, it is easy to cause oscillation problems; by using the state space method to analyze the grid-connected resonance mechanism of photovoltaic virtual synchronous generators, not only can accurately determine the resonance frequency of the system, but also determine the influence of each parameter element on t...
Embodiment 2
[0165] refer to Figure 9 , is the second embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a system based on photovoltaic virtual synchronous generator grid-connected resonance analysis, including an information module 100, an analysis module 200, The calculation module 300 and the information module 100 are used to construct the small signal model of the photovoltaic virtual synchronous generator connected to the grid and establish the state space matrix; the analysis module 200 is used to analyze the grid-connected resonance mechanism of the photovoltaic virtual synchronous generator and judge the resonance of each node Participation factors, components, and parameters affect the resonance law; the calculation module 300 is used to solve the eigenvalues and left and right eigenvectors of the state space matrix, calculate the resonance participation factor, change the size of the components and parameters, and ob...
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