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三相不平衡低压电网中有负序、零序分量以及谐波,导致有功和无功功率波动的电能质量问题。采用动态性能好、谐波含量小的DSTATCOM进行补偿优化控制。用αβ0坐标变换方法,将零序分量分离进行单独补偿控制。基于基波中负序电流引起功率2倍频波动,设置2个独立调节的参数,计算不同控制目标下的参考电流,推导统一控制表达式,并采用粒子群算法优化独立参数,同时抑制有功和无功波动。引入比例谐振控制器控制矢量电流交流分量,在达到与PI调节相同效果时,省去繁琐的dq坐标变换计算,简化控制策略,并给出仿真验证。结果表明三相不平衡时,当限制无功波动在10%内时,有功波动相应减弱16%,验证了本文提出控制方法的可行性及有效性。
Negative sequence, zero sequence components and harmonics in the three-phase unbalanced low-voltage power grid lead to power quality problems of active and reactive power fluctuations. Using dynamic performance, low harmonic content DSTATCOM compensation and optimal control. With αβ0 coordinate transformation method, the zero-sequence component is separated and compensated separately. Based on the negative sequence current in the fundamental wave, the 2-fold fluctuation of power is caused. Two independently adjusted parameters are set, the reference currents are calculated under different control targets, the unified control expressions are derived, and the particle swarm optimization is used to optimize the independent parameters, Reactive power fluctuations. The proportional resonance controller is introduced to control the vector AC current components. When the same effect as PI regulation is achieved, tedious dq coordinate transformation is eliminated, the control strategy is simplified, and simulation verification is given. The results show that when the three-phase imbalance is limited, the fluctuation of reactive power is correspondingly reduced by 16% when the reactive power fluctuation is within 10%, which verifies the feasibility and effectiveness of the proposed control method.