单独注入式有源电力滤波器的控制分析

根据某厂谐波治理工程对谐波抑制及无功功率补偿的要求,提出采用大功率单独注入式有源电力滤波器方案,分析了其拓扑结构和特点,建立控制系统方程,并从稳态控制和动态控制对其进行稳定控制机理研究,比较了根据滤波支路谐波电流、电源谐波电流、负载谐波电流、负载谐波电压进行控制的4种动态控制策略。对工况复杂、谐波电流变化较大的应用场合,最终选择根据负载谐波电流来控制逆变器输出电压的有源电力滤波器控制策略,并通过实验验证了其较好的滤波效果。

Control of active power filter with single injection circuit

To meet the requirements of harmonic suppression and reactive power compensation of a factory, a solution of High Active Power Filter with Single Injection Circuit is put forward. Its topology and features are analyzed,its control system equations are established,its stability control mechanism is studied in both steady and dynamic controls,and four dynamic control strategies are compared:control according to filter branch harmonic current,power source harmonic current,load harmonic current,or load harmonic voltage. For the specific application in complicated working condition and large harmonic current change,the strategy of inverter output voltage control according to load harmonic current is chosen. Experiment proves its good filtering effect.