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利德华福高压变频器原理及主要功能
3.1原理简介:HARSVERT-s系列高压变频调速系统采用单元串联多电平技术,属“高-高”电压源型变频器,为单元串联多电平拓扑结构,主体结构由多组功率模块串联而成,从而由各组低压叠加而产生需要的高压输出,它对电网谐波污染小,总谐波畸变小于4%,直接满足IEEE519-1992的谐波抑制标准,输入功率因数高,不必采用输入谐波滤波器和功率因数补偿装置;输出波形质量好,不存在谐波引起的电机附加发热和转矩脉动噪音、输出dv/dt、共模电压等问题,不必加输出滤波器,就可以使用于普通的同步电机, 10kV每个系统共有24个功率单元,每8个功率单元串连构成一相,其系统结构如图1所示。
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