Microgrid inverter multi-loop control method based on virtual synchronous generator
A virtual synchronization and control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of lack of scheduling means, inability to take the initiative to system, and large influence on the power grid, so as to simplify the control system, improve the voltage waveform, and improve the power factor. Effect
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[0022] Such as figure 2 As shown, the figure is a three-phase inverter topology. Among them, V in is the DC voltage on the input side; Q 1 ~Q 6 is the switch tube; e a , e b , e c is the output voltage of the three-phase bridge arm; i a , i b , i c is the three-phase inductor current; L 1 , C and L 2 is the output LCL filter; V Ca , V Cb , V Cc is the three-phase capacitor voltage; V ga , V gb , V gc is the grid voltage.
[0023] go to image 3 , describing the overall control block diagram, which mainly includes a power calculation module, a phase-locked loop module, a coordinate conversion module, a PI regulator, a VSG algorithm module, a voltage and current double closed-loop module and a PWM modulation module.
[0024] First, the voltage and current sensors detect the three-phase capacitor voltage on the output side and the current u on the inductor inv,a,b,c , i La,b,c . The detected output side voltage and current are used in two modules, one is a p...
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