An improved control strategy for grid-connected voltage source inverters with a LCL filter
An improved control strategy for grid-connected voltage source inverters with a LCL filter
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DOI：
10.1109/tpel.2008.924602
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
G. Shen;Dehong Xu;D. Xi;Xiaoming Yuan
中科院分区：
文献类型：
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作者：
G. Shen;Dehong Xu;D. Xi;Xiaoming Yuan
提出了一种新型的带LCL滤波器的并网电压型逆变器控制策略。该策略将LCL-FILTER的电容分成两部分，测量两部分之间的电流作为电流调节器的反馈，以稳定和改善系统的性能。通过这种方法，逆变器控制系统由三阶简化为一阶，并且可以很容易地对闭环控制系统进行优化，使稳态误差和电流谐波失真最小。研究了采用该控制器的逆变器系统的特性，并与传统的控制策略进行了比较。给出了仿真结果，并在5kW燃料电池逆变器上进行了实验验证。
This paper proposes a novel control strategy for grid-connected voltage source inverters (VSI) with an LCL-filter. The strategy "split" the capacitor of LCL-filter into two parts, and the current flowing between these two parts is measured and used as the feedback of a current regulator to stabilize and improve the system performances. By this way, the inverter control system is simplified from third-order to first-order, and the close loop control system can easily be optimized for minimum steady-state error and current harmonic distortion. The characteristics of the inverter system with the proposed controller are investigated and compared with the traditional strategy. Simulations results are provided, and the new current control strategy has been experimentally tested on a 5kW fuel cell inverter.