Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance
A technology of virtual impedance and control method, which is applied in the direction of electrical components, circuit devices, emergency power supply arrangements, etc., can solve problems such as the inability to work stably in parallel inverter systems, and achieve fast dynamic response, high flexibility and redundancy , High stability effect
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0025] The equivalent circuit diagram of two inverters running in parallel in the microgrid is as follows: figure 1 shown. where the output impedance of each inverter and wiring impedance The sum is The output voltage of each inverter is The output currents are I on (n=1, 2), the circulation between the two inverters is I H , the voltage at the point of common coupling is
[0026] Adopt the step of control method of the present invention as follows:
[0027] Step 1. The output voltage of the inverter is generated with reference to a given signal
[0028] The respective output voltages of each inverter in a parallel inverter system using a synchronous rotating phase-locked loop Perform phase locking to obtain the phase angle of the inverter output voltage phase angle and inverter output voltage reference amplitude Synthetic ...
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