摘要
采用LCL型逆变器的并网系统是新能源并网的主要方式,然而数字控制的延迟和并网电压扰动影响LCL型并网系统的稳定性。为解决上述影响因素,提出了考虑数字延时的并网电压前馈控制策略,降低了并网电流的谐波畸变率和电压带来的影响;分析了有源阻尼系数对谐振尖峰的影响,提出了增强粒子群有源阻尼系数优化方法,提升了并网系统的电能质量和抗扰能力,最后通过仿真验证了所提方法的正确性和有效性。
The grid-connected system using LCL inverter is the main way of new energy grid-connection,but the delay of digital control and grid-connected voltage disturbance affect the stability of LCL-type grid-connected system.In order to solve the above influencing factors,a feed-forward control strategy considering the grid-connected voltage considering digital delay is proposed,which reduces the harmonic distortion rate of the grid-connected current and the influence of voltage.The influence of active damping coefficient on resonance spikes is analyzed,and an optimization method for enhanced particle swarm active damping coefficient is proposed,which improves the power quality and anti-disturbance ability of the grid-connected system,and finally verifies the correctness and effectiveness of the proposed method through simulation.
作者
李卫国
陈志鹏
吴知雨
LI Weiguo;CHEN Zhipeng;WU Zhiyu(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education Northeast Electric Power University,Jilin 132012,China)
出处
《电气应用》
2024年第4期91-99,共9页
Electrotechnical Application
基金
国家自然科学基金项目“大规模新能源发电主动支撑与源网协同控制”(U1766204)
国家重点研发计划项目“可再生能源发电基地直流外送系统的稳定控制技术”(2017YFB0902004)
吉林省科技发展计划项目“低压配电保护方案设计与检测技术研究及相关国家标准建设研究”(20210509059RQ)。
关键词
LCL型逆变器
增强粒子群算法
数字延迟
电压前馈控制
LCL inverter
enhanced particle swarm algorithm
digital delay
grid-connected voltage feedforward
