针对含储能装置的传统光伏虚拟同步发电机（PV-VSG）不仅投资成本高且未考虑光伏阵列输出特性的问题,提出一种基于滑模变功率点跟踪（SM-VPT）的PV-VSG控制策略。该方法在滑模控制的基础上引入直流母线电压偏差控制,调整光伏阵列的功率跟踪轨迹,实现光伏出力自适应匹配负载需求,即当光伏容量充足时,只提供与负载相匹配的功率;光伏功率不足时,可实现传统的MPPT控制以减少电力短缺,同时防止直流电压骤降,保证系统稳定运行。该方法使PV-VSG能够按需向负载供电,无需增加额外的储能设备,可实现光伏发电系统直接以VSG形式接入并网,仿真结果验证了所提控制方法的有效性。
Abstract
Aiming at the problem that the traditional photovoltaic virtual synchronous generator （PV-VSG） with energy storage device not only has high investment cost, but also does not consider the output characteristics of photovoltaic array, a PV-VSG control strategy based on sliding mode variable power point tracking （SM-VPT） is proposed. Based on the sliding mode control, the DC bus voltage deviation control is introduced to adjust the power tracking trajectory of photovoltaic arrays, so as to realize the photovoltaic output adaptively matching the load demand. That is, when the photovoltaic capacity is sufficient, only the power matching the load is provided; when the photovoltaic power is insufficient, traditional maximum power point tracking （MPPT） control can be implemented to reduce power shortage, meanwhile, the DC voltage sag can be prevented to ensure the stable operation of the system. This method enables the PV-VSG to supply power to the load on demand without additional energy storage equipment, and realizes the photovoltaic generation system directly connected to the grid in the form of VSG. The simulation results verify the effectiveness of the proposed control method.
关键词
虚拟同步发电机 /
光伏 /
储能 /
滑模控制 /
变功率跟踪 /
功率匹配
Key words
virtual synchronous generator /
photovoltaic /
energy storage /
sliding mode control /
variable power tracking /
power matching
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基金
国家自然科学基金青年基金项目（51607151）; 四川省创新创业项目（S201910615055）
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