低压微电网中并网逆变器的工程实现

发布时间：2018-06-07 23:07

本文选题：并网逆变器 + LCL滤波器　；参考：《电源技术》2014年10期

【摘要】：逆变器侧电流反馈具有稳定性强、单闭环控制、参数设计简单和系统成本较低的优点,但是它属于电网电流间接控制,导致并网功率因数较低,并且电网电流中还包含由电网电压引起的低次谐波电流。为保留其优点并克服其缺点,提出了一种适用于逆变器侧电流反馈LCL并网逆变器的完全电网电压前馈控制策略,该策略能完全消除电网电压对电网电流的影响,并且并网功率因数得到了很大的提升。该控制策略在工程实现的过程中,任何一个环节上出现的误差都会导致并网电流波形质量的下降。结合在工程实践中遇到的问题,主要从锁相环、工频周期的检测和逆变器输出电压频率的调节方面提出了改进措施。实验结果表明,所提控制策略正确,工程实现改进措施有效。
[Abstract]:Inverter side current feedback has the advantages of strong stability, single closed loop control, simple parameter design and low system cost, but it belongs to the indirect control of grid current, resulting in low power factor. And the power grid current also contains the low harmonic current caused by the grid voltage. In order to preserve its advantages and overcome its disadvantages, a novel voltage feedforward control strategy for LCL grid-connected inverter with inverter side current feedback is proposed, which can completely eliminate the influence of grid voltage on power grid current. And the power factor has been greatly improved. In the process of engineering implementation of the control strategy, the quality of grid-connected current waveform will be reduced by any error in any link. Combined with the problems encountered in engineering practice, the improvement measures are put forward mainly from the aspects of phase-locked loop, the detection of power frequency cycle and the regulation of the output voltage frequency of the inverter. The experimental results show that the proposed control strategy is correct and the engineering improvement measures are effective.
【作者单位】：盐城工学院;
【基金】：国家自然科学基金(51107108)
【分类号】：TM464

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