摘要
为提高并网逆变器在谐波电网电压下的适应能力,改善系统输出电能质量,文章提出了多次采样的改进功率控制策略。该策略在传统直接功率控制基础上,引入谐振控制器,通过选择电流或功率反馈信号,实现了三相并网电流正弦性和输出有功功率、无功功率平稳无波动。同时,在改进功率控制基础上引入多次采样策略,解决了由脉宽调制(PWM)并网逆变器DSP数字控制过程中的延时,而导致谐振控制器实际谐振频率与设定频率偏离的问题,改善两种控制目标下的谐波抑制效果。在Simulink中搭建并网逆变器系统模型进行仿真,验证了所提出策略的有效性。
In order to improve the adaptability of grid connected inverter under the harmonic grid voltage and improve the output power quality of the system,an improved power control strategy of multiple sampling is proposed.Based on the traditional direct power control,resonance controller is introduced to achieve two independent control objectives by selecting current or power feedback signals:1.Sinusoidal current of three-phase grid connection;2.Stable and no fluctuation of active and reactive power output.In addition,aiming at the problem of time delay in DSP digital control of PWM grid connected inverter,a strategy of multiple sampling is proposed based on the improved power control to solve the problem that the actual resonance frequency of resonance controller deviates from the set frequency caused by time delay and improve the harmonic suppression effect under the two control objectives.In Simulink,a grid connected inverter system model is built and simulated to verify the effectiveness of the proposed strategy.
作者
董宁
何山
王维庆
袁至
邱瑞东
白云长
Dong Ning;He Shan;Wang Weiqing;Yuan Zhi;Qiu Ruidong;Bai Yunchang(School of Electric Engineering,Xinjiang University,Urumqi830049,China;Engineering Research Center of Ministry of Education for Renewable Energy Power Generation and Grid Connection Control,Urumqi830049,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2021年第6期797-802,共6页
Renewable Energy Resources
基金
新疆维吾尔自治区重点实验室开放课题(2018D04005)
国家自然科学基金项目(51767024,51667020)
教育部创新团队项目(IRT-16R633)。
关键词
谐波电网电压
改进功率控制
并网逆变器
谐振控制器
控制延时
多次采样
harmonic grid voltage
improved power control
grid connected inverter
resonance controller
control delay
multiple sampling
