摘要
光伏并网系统中,为了抑制逆变器参数不确定和电网干扰对输出电能的影响,提出了基于H∞鲁棒控制的光伏并网逆变器控制策略。在分析三相光伏并网逆变器的数学模型基础上,建立了包含不确定参数和电网干扰的模型,基于系统性能要求选取加权函数,并求得广义被控对象的状态空间实现,通过求解代数Riccati方程,得到H∞鲁棒控制器。通过仿真与传统PI控制方法进行比较,验证了该控制器对参数变化和电网干扰具有较强的鲁棒性。
In order to suppress the influences of inverter parameters uncertainty and grid disturbances to the output power quality, the control strategy of photovoltaic grid inverter based on H∞robust control was proposed. Based on analysis of the three-phase photovoltaic grid inverters mathematical model, a modified model was constructed, which contained uncertain parameters and grid disturbances. The weighting function was selected according to the requirements of system performance, and the generalized state-space realization of the controlled object was calculated. The H∞controller was obtained by solving algebraic Riccati equations. Compared with the traditional PI controller, the simulations verify that the controller has strong robustness about parameters variations and grid disturbances.
出处
《电源技术》
CAS
CSCD
北大核心
2016年第3期607-609,641,共4页
Chinese Journal of Power Sources
基金
国网科技项目(规模化光伏发电运行控制关键技术研究与示范)
关键词
光伏并网逆变器
参数不确定
电网干扰
H∞控制
鲁棒性
photovoltaic grid-connected inverter
parameters uncertainty
grid disturbances
H∞control
robustness
