考虑短时波动的分布式光伏逆变器鲁棒集中-就地控制策略

Robust Centralized-local Control Strategy of Distributed Photovoltaic Inverter Considering Short-time Fluctuation

针对光伏逆变器集中控制对源、荷短时波动考虑不足的问题,提出一种鲁棒集中–就地控制策略。首先,以网损和弃光量加权最小为目标,建立逆变器有功、无功集中控制模型;针对控制间隔内短时波动导致的电压越限和潮流波动,以集中控制结果为参考,通过动态参数就地控制策略平抑波动,提出无功出力–有功削减–斜率参数的三参数集中–就地控制模型。其次,采用区间模型建模短时波动,以极端波动场景的电压偏差最小为目标,建立就地控制策略鲁棒优化模型。最后,基于二阶锥规划和灵敏度分析,提出控制策略的求解方法,通过算例验证模型的有效性,并分析波动性、渗透率、逆变器容量对控制的影响,提升主动配电系统的运行安全性和经济性。

In allusion to the problem that the centralized control of photovoltaic inverter takes into account the short-term fluctuations of source and load deficiently,a robust centralizedlocal control strategy was proposed.Firstly,taking minimizing network loss and light rejection as an object,centralized active and reactive power control model was established;In view of the voltage out of limit and power flow fluctuation caused by the short-term fluctuation in the control interval,a three parameter centralized-local control model of reactive power outputactive power reduction-slope parameter was proposed based on the centralized control results.Secondly,the interval model was used to model short-term fluctuations,and the robust optimization model of local control strategy was established to minimize the voltage deviation in extreme fluctuation scenarios.Finally,solution method of control strategy based on second-order cone programming and sensitivity analysis was proposed.The validity of proposed model was verified by a numerical example,and the influence of fluctuation,permeability and inverter capacity on the control was analyzed to improve the operation safety and economy of the active distribution system.