一种解决并网型太阳能光伏-电池储能系统同步与电压升高问题的控制方法

This work presents a second-order generalized integrator (SOGI)-adaptive complex filter (ACF) based control with variable power mode to address synchronization and voltage rise issues in a grid integrated solar photovoltaic battery storage system. SOGI-ACF method is a fourth-order filter that resolves synchronization and power quality (PQ) issues by obtaining positive sequence components (PSCs) of unbalanced/distorted grid voltages. It has an excellent dynamic response with inherent dc offset, negative sequence rejection capabilities, and better harmonic rejection than other fourth-order generalized integrator-based filters. This algorithm is also used to acquire the load current's PSCs, incorporating multifunctional capability into system. In addition, the system provides grid support by restraining voltage rise at the point of common coupling during high solar photovoltaic array penetration into ac grid, according to the IEEE std 1547 limit. To provide grid support, the control strategy operates the system in variable power operating modes, depending upon system constraints, and accordingly regulates active and reactive powers of ac grid. Experimental results reveal restrain in voltage rise during peak generation and PQ improvement under unbalanced/ distorted grid voltage and load current conditions.