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从六十年代起,可控硅串级调速在国内外得到了迅速发展。首先在小调速范围的风机、泵类上应用,逐步发展到深调速,在提升机上应用。 串调技术应用广泛,遍及各行各业,并向大容量、高技术方向发展。国外用串调控制的单机容量已达20000千瓦,国内绕线式感应电动机的最大容量为3200千瓦,串调装置已能与2000千瓦电动机配套使用。 可控硅串级调速,所以能得到如此迅速的发展,是因为它具有一系列的优点。但目前在可控硅串级调速发展中,提高功率因数,减少高次谐波对电网的危害及串调装置的保护几个问题是急待解决的。 (一)提高功率因数 1.可控硅串调系统功率因数低的原因 (1)电动机和可控硅逆变器都需要从
Since the 1960s, silicon controlled cascade speed has been rapidly developed both at home and abroad. First in the small speed range of fans, pumps on the application, and gradually developed to the deep speed, in the hoist application. String transfer technology is widely used in all walks of life, and to large-capacity, high-tech direction. Foreign use of string transfer control stand-alone capacity has reached 20000 kilowatts, the domestic winding induction motor maximum capacity of 3200 kilowatts, string transfer device has been supporting the use of 2000 kilowatts of motor. SCR cascade speed, it can be so rapid development, because it has a series of advantages. However, at present, in the development of silicon controlled cascade speed control, several problems such as improving power factor, reducing the harm of high harmonics to the power grid and protecting the cascade devices are urgent issues to be solved. (A) to improve the power factor 1. SCR series system low power factor reasons (1) motor and SCR inverter are required from