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并联有源电力滤波器的工作原理是主电路向电网注入大小相等、方向相反的电流量来达到谐波抑制,其性能主要包括动态响应速度和稳态补偿精度。PI控制应用于谐波抑制具有动态响应快、稳态精度低的特点,重复控制具有稳态精度高、动态响应慢的特点,为综合两者的优点,提出将重复控制与PI控制进行串并联的复合控制策略:先将一重复控制与PI控制构成串联复合,再将串联复合与另一重复控制并联构成串并联复合。并将其与PI控制、串联复合控制和并联复合控制的谐波补偿性能分别进行了仿真对比研究与实验验证。仿真结果表明串并联复合控制具有更好的谐波补偿稳态结果和动态响应性能,实验结果证明了该方法的可行性与正确性。
The working principle of shunt active power filter is that the main circuit injects the equal and opposite current into the power grid to achieve the harmonic suppression. The performance of the shunt active power filter mainly includes the dynamic response speed and the steady-state compensation accuracy. PI control has the characteristics of fast dynamic response and low steady-state accuracy. The repetitive control has the characteristics of high steady-state accuracy and slow dynamic response. To sum up the advantages of both, PI control is proposed to be connected in series and parallel with PI control The composite control strategy: First, a repetitive control and PI control constitute a series compound, then the series compound and another repeat control in parallel to form a series-parallel combination. The simulations and experimental verifications of harmonic compensation performances of PI control, series combination control and parallel combination control are carried out respectively. The simulation results show that the series-parallel combination control has better harmonic compensation steady-state results and dynamic response performance, and the experimental results prove the feasibility and correctness of the method.