基于电网阻抗识别的谐波控制器调度策略

Harmonic controller scheduling strategy based on power network impedance identification

针对弱电网条件下谐波控制器相位滞后导致的电力有源滤波器振荡问题,提出一种基于电网阻抗识别算法的谐波控制器调度策略.当电网阻抗变大且电压畸变时,首先通过主动谐波注入及Goertzel算法对电网阻抗进行识别,然后根据测量的电网阻抗对谐波控制器进行合理调度,保证系统在控制带宽较低的情况下拥有足够的稳定裕度.为保证调度策略的可靠性并减少主动谐波注入对电网产生的影响,设计了详细的谐波注入规则及系统运行规则.最后通过物理实验平台上的实验验证了控制策略的可行性与有效性.

controller scheduling strategy was proposed based on grid impedance identification algorithm. When the grid impedance became large and the voltage was distorted,the grid impedance was identified by active harmonic injection method and Goertzel algorithm firstly,and then the harmonic controller was reasonably scheduled according to the measured grid impedance.So the system could have enough stability margins when the control bandwidth was low.To ensure the reliability of the scheduling strategy and reduce the influence of active harmonic injection on the power grid, detailed harmonic injection rules and system operation rules were designed. Finally, the feasibility and effectiveness of the control strategy were verified by experiments on physical experiment platform.