新能源并网输电电缆谐波谐振分析及抑制方法

发布时间：2018-06-09 03:46

本文选题：谐波谐振 + 有源谐波电阻　；参考：《电力系统自动化》2017年17期

【摘要】：光伏发电或风力发电的选址距配电网一般较远,往往需要通过电缆进行连接。由于电缆的寄生电容较大,使得配电网中的谐波电压在长电缆中出现谐波谐振的问题。在电缆线路终端加入电阻可以有效阻尼电缆上的谐波谐振,且最优的电阻值为电缆的特征阻抗。利用分布式能源并网逆变器,在输出基波有功能量的同时,通过有源谐波电阻的控制策略在连续的谐波频率上模拟纯电阻的特性,可以实现阻尼宽频域谐波谐振的功能。文中首先建立了电缆线路的分布参数模型,并且分析了由于新能源并网接入点电压谐波而引起的电缆线路谐波谐振问题。然后,基于有源谐波电阻的思想,提出一种新的谐波电流指令生成方法,可以实现新能源并网逆变器在连续的谐波频率上呈现纯电阻特性。最后,利用仿真和实验验证了理论分析的正确性及所提出谐波电流控制方式的有效性。
[Abstract]:The location of photovoltaic or wind power generation is usually far away from distribution network, and it often needs to be connected by cable. Because of the large parasitic capacitance of the cable, the harmonic voltage in the distribution network has the problem of harmonic resonance in the long cable. The harmonic resonance on the cable can be effectively dampened by adding resistance to the cable terminal, and the optimum resistance value is the characteristic impedance of the cable. By using distributed grid-connected inverter, the function of damping harmonic resonance in broadband domain can be realized by using the control strategy of active harmonic resistance and the control strategy of active harmonic resistance to simulate the characteristics of pure resistance in continuous harmonic frequency. In this paper, the distribution parameter model of the cable line is established, and the harmonic resonance of the cable line caused by the voltage harmonics of the new energy connection access point is analyzed. Then, based on the idea of active harmonic resistance, a new generation method of harmonic current command is proposed, which can realize the pure resistance characteristics of new energy grid-connected inverter on the continuous harmonic frequency. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed harmonic current control method are verified by simulation and experiments.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);国网山东省电力公司电力科学研究院;
【基金】：国家自然科学基金资助项目(51207126) 教育部新世纪优秀人才支持计划资助项目(NCET-12-0450)~~
【分类号】：TM711;TM761

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