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Two-lap sequential control converters are usually adopted to supply and improve the power factor of input side. The line harmonic damage generated by a sequential control thyristor converter can be serious. To solve this prob-lem and seek an optimum control strategy,we derived the changeable regular of the line-input-current,the fundamen-tal-frequency-current,the harmonic-current-content and the harmonic total distortion ratio of the converter at different firing angles. We obtained relevant data from experiments with a sequential control system of a DC 2.2kW/220V motor. With the example of the operating condition of a DC mine elevator,the harmonic current is two times approximately in sequential control compared to synchronous control when the firing angle of the two converters differs in 30°. At dif-ferent operating states of a two-lap connection converter,the ideal strategy is an exchange between sequential control and synchronous control,by which we can achieve the complementary goal of improving the power factor and har-monic effect. All analytical conclusions are supported by simulation and experimental results.
Two-lap sequential control converters are usually adopted to supply and improve the power factor of input side. The line harmonic damage generated by a sequential control thyristor converter can be serious. To solve this prob-lem and seek an optimum control strategy, we derived the changeable regular of the line-input-current, the fundamen-tal-frequency-current, the harmonic-current-content and the harmonic total distortion ratio of the converter at different firing angles. system of a DC 2.2kW / 220V motor. With the example of the operating condition of a DC mine elevator, the harmonic current is two times approximately in sequential control compared to synchronous control when the firing angle of the two converters differs in 30 °. At dif-ferent operating states of a two-lap connection converter, the ideal strategy is an exchange between sequential control and synchronous control, by which we can achieve the complementary g oal of improving the power factor and har-monic effect. All analytical conclusions are supported by simulation and experimental results.