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Aiming at the problems, of which distributed generation(DG) access has the influence on the grid voltage, a voltage stability evaluation index (FVSI) considering DG is proposed. The theoretical deduction and analysis process is given. Taking the typical circuit of IEEE33 node as an example, the simulation experiment is carried out in different proportion of DG. Through the comparative analysis of...
A general problem in the double PWM converter is the voltage unbalance of the dc-link capacitors. This unbalance distorts the waveforms of the output voltage and current. Furthermore, it will lead to instability of the inverter system. Based on the analysis for the unbalance problem, a novel feedback control strategy of DC capacitor voltage deviation is proposed in this paper. The method does not...
This paper introduces the single-phase H bridge inverter topology and working principle, and gives the way how to design the parameters of cascade multi-level inverter filter. Use FPGA to realize the cascade multi-level inverter by carrier phase-shift control. The circuit structure is simple and high reliability. At last, design a cascade 2H bridge inverter prototype to test it. The experimental result...
A novel main circuit topology of three phase parallel type multi-objective controllable current quality disturbance generator is proposed in this paper. Basing on the differences of function module, the generator is divided into fundamental power module and harmonic power module. The fundamental power can generate power frequency current and less than the power frequency current. Harmonic power module...
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