摘要
并网光伏发电系统输出功率的波动性和随机性给并网后系统稳定性、光伏发电消纳以及光伏电站电能质量等方面带来了负面影响,制约了光伏发电的发展。针对这一问题,将超级电容器作为功率调节装置,控制光伏并网系统按指定值平滑、准确地输出功率,使光伏发电具有可调度性。在分析了超级电容特性、系统构成和双向DC/DC变换器状态空间平均小信号模型的基础上,提出功率、电流双闭环反馈滞环电流控制策略,控制超级电容器吸收或补充输出功率的波动成分。在PSCAD/EMTDC电力系统仿真软件中构建仿真模型,对提出的系统和控制策略进行了仿真分析,良好的仿真结果验证了方法的可行性。
Output power of a grid-connected photovoltaic power generation system is often random and fluctuant. This is harmful to the stability of the power system, the photovoltaic power consumption and power quality, and therefore restricts the development of PV generation. To address these issues, supercapacitors were adopted as a power regulating device. This controls the grid-connected photovoltaic system to enable output power according to a preset condition in a smooth and stable manner. In this paper, an analysis is done on the supercapacitor characteristics, system structure and small-signal model of the bi-directional DC / DC converter. Based on the analysis, a strategy is put forward for power and current double closed-loop with feedback hysteresis current control. Finally, simulations are carried out in the PSCAD / EMTDC environment and the results and the results suggest the feasibility of the method.
出处
《储能科学与技术》
CAS
2013年第3期222-226,共5页
Energy Storage Science and Technology
关键词
超级电容器
光伏并网
DC
DC变换器
滞环控制
Supercapacitor
photovoltaic grid-connected system
bi-directional DC / DC converter
feedback hysteresis current control
