混合型有源滤波器与静止无功补偿器组成综合补偿系统的电流控制

Current Control of Combined Compensation System Composed of HAPF and SVC

针对综合补偿系统中逆变器输出电流相位经输出滤波器、耦合变压器、无源滤波器后会产生相移的问题,分析了逆变器输出电流相移的原因,提出了广义滞后的概念和分频补偿的思路。为消除广义滞后对综合补偿系统带来的不利影响,利用逆变器输出电流与负载及晶闸管控制电抗器谐波电流极性相反等同于相位滞后π的原理,构造了一种新型π目标Smith预估器进行滞后补偿。结合广义积分器良好的分频性能,提出了基于广义滞后分频预估补偿的综合补偿系统电流广义积分控制方法,并通过仿真和实验验证了该方法的有效性和可行性。

According to the phase delay of output current of combined compensation system which is composed of hybrid active power filter （HAPF） and static vat compensator （SVC）, the reason causing the phase delay is analyzed, including passive filters, coupling transformer and output filter. The phase delay mentioned above is called as generalized delay here, which is variable with different frequency. In order to eliminate the effects of generalized delay, a novel π-aimed Smith predictor is established based on the fact that there is a π delay between output current and load and thyristor controlled reactor （TCR） harmonic current, which are negative in polarity. Applying generalized integrators with excellent performances of frequency division, a generalized integral control based on predictive compensation at different frequency for generalized delay is proposed. The feasibility and effectiveness of this control method is verified by PSIM simulation and experimental results.