无功动态补偿的光储发电系统并网控制方案

配电系统中的光储发电系统往往在用户侧直接并网,而用户侧的无功负荷变化会引起并网点的电压波动.为了实现并网点电压的稳定,提出了一种具有无功动态补偿能力的光储发电系统并网控制方案.该方案通过派克变换达到有功、无功功率独立控制的目的,一方面控制蓄电池充放电,在光照变化的情况下实现光储发电系统的稳定有功输出;另一方面利用逆变电路的无功补偿能力,控制调节其对无功负荷的供给,使得大电网提供的无功功率为恒定值,从而保证在无功负荷变化的情况下并网点的电压稳定.这种方案在不增加任何附加设备和复杂度的情况下,简单可靠地实现了光储发电系统的稳定有功功率输出和并网电压稳定的双重控制目标.理论研究和仿真测试均验证了新型并网控制方案的有效性和优越性.

Grid-Connected Control Scheme of PV and Battery Generation System with Dynamic Reactive Power Compensation

In distribution network,the photovoltaic（PV） and battery generation systems are directly connected to grid system at the user side,while the reactive load changes of the user side will cause voltage fluctuations at the grid-connected point. To solve this problem,a synchronization control program with the capacity of dynamic reactive power compensation for PV and battery generation system was proposed. In the program,the reactive and active power outputs were controlled independently through Park transformation. On one hand, the charging and discharging of the battery was controlled to achieve the stability of active power output of the PV and battery generation system in the case of light changes. On the other hand,the reactive power output was controlled to balance the dynamic requirement of reactive power,so as to ensure the voltage stability of the network in the case of reactive power load changes. The dual-control target of active power output stability and the voltage stability of the gridconnected point were easily and reliably achieved,without adding any additional equipment and complexity of the case. Theoretical studies and simulation tests both verified the effectiveness and superiority of the grid-connected control program.