| 引用本文: | 易映萍,罗海,胡四全.小功率光伏并网逆变器控制策略的研究[J].电力系统保护与控制,2016,44(4):64-68.[点击复制] |
| YI Yingping,LUO Hai,HU Siquan.Study on control scheme based on low-power photovoltaic grid-connected inverter[J].Power System Protection and Control,2016,44(4):64-68[点击复制] |
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| 摘要: |
| 为减少开关频率引起的电流谐波和实现电气隔离，采用带T型滤波器和工频隔离变压器的并网逆变器拓扑。针对传统电流SPWM控制响应速度慢和单纯采用电流PI控制不能消除电网扰动对并网电流影响的缺点，提出了电流PI和电网电压前馈相结合的SPWM电流瞬时值跟踪控制。通过对光伏并网逆变器控制原理的理论分析，设计了并网逆变器控制模型，并推导出各个控制环节的传递函数模型，最后进行了电流环PI调节器的设计。通过对Matlab仿真结果分析，表明该种控制策略是可行的。 |
| 关键词: T型滤波器 工频隔离变压器 电流PI 电压前馈 SPWM电流瞬时值跟踪控制 Matlab |
| DOI：10.7667/PSPC150731 |
| 投稿时间：2015-05-04修订日期：2015-06-17 |
| 基金项目:国家高技术研究发展计划(863计划)资助项目(2012AA050206) |
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| Study on control scheme based on low-power photovoltaic grid-connected inverter |
| YI Yingping,LUO Hai,HU Siquan |
| (University of Shanghai for Science and Technology, Shanghai 200093, China;Xuji Flexible Transmission System Corporation, Xuchang 461000, China) |
| Abstract: |
| In order to reduce line-side current harmonic caused by switching frequency and achieve electrical isolation, a grid-connected inverter with a T filter and an isolation transformer is used. To make up for the shortcomings of independent PI control of current and low response rate of traditional current-SPWM control, the method of current- SPWM control of tracking current momentary value with PI control of current and voltage feed-forward is presented. With the analysis of control principle of grid-connected inverter, control model of the grid-connected inverter is designed, transfer functions of every control link are derived and PI parameters are designed. At last, the Matlab simulation results show that the control strategy is feasible. |
| Key words: T filter isolation transformer PI control of current voltage feed-forward current-SPWM control Matlab |
