Studies on Characteristics of Power System Composed of Various Power Sources with Electronic Power Conversion

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1. Inverter power sources can affect the dynamic performance of the interconnected power system, if the capacity of inverters is not negligibly small compared with that of the power system. A power supplying system composed of a synchronous generator and an inverter power source of comparable capacity was assumed, and examined was its dynamic performance such as frequency variation and voltage variation in case of dc output power change and load change via computer simulations and simulated experiments. From the results of simulations and experiments, it was found that the dynamic performance is mainly governed by the frequency control mechanism (governor) of the synchronous generator and the voltage and phase angle control scheme of the inverter.2. If an area is largely supplied electric power by inverter power sources, power supply can be continued in case of disconnection from the main power system. For the operation of islanded power network composed of inverters without a synchronous generator, a new frequency control and load sharing schemes for the inverters should be developed. In the present study, a control algorithm for that purpose was proposed, and its validity was examined via transient simulations. From their results it was found that the frequency and load sharing are adequately controlled under transients such as load change and area disconnection, if the control system is designed rightly.