Finally, based on the special circuit structure of the isolated inverter, a single-phase high-frequency isolated inverter parallel experimental prototype is constructed, and the corresponding control strategy is presented. Experimental results show the excellent voltage spike suppression capability of the simplified active clamping circuit.
A novel strategy is proposed for high-frequency oscillation in multi-inverter systems. The hardware in the loop experiment is designed for verification. In the context of the energy crisis and environmental pollution, microgrid technology has developed rapidly.
The multi-inverter parallel system in this paper is mainly composed of three voltage source inverters in parallel, all of which adopt droop control. The simplified Thevenin equivalent model diagram is shown in Fig. 6, where Zline represents line impedance and ZR represents resistive inductive load.
Series inverters are characterised by the load impedance capacitive at low frequency and inductive at high frequency. The transition frequency between being capacitive and inductive is the resonant frequency, a. at which frequency the L-C-R load circuit appears purely resistive and maximum power is transferred to the load, R.
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