| 引用本文: | 徐先峰,马文昊,卢 勇,等.基于充电站谐波特性的频率自适应有源电力滤波控制策略[J].电力系统保护与控制,2024,52(21):24-34.[点击复制] |
| XU Xianfeng,MA Wenhao,LU Yong,et al.Frequency adaptive active power filtering control strategy based on harmoniccharacteristics of a charging station[J].Power System Protection and Control,2024,52(21):24-34[点击复制] |
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| 摘要: |
| 随着分布式新能源在充电站的接入，源荷的随机特性使电网基频发生波动，进一步加剧站内谐波电流越限风险。对此，提出了一种频率自适应的有源电力滤波谐波检测与跟踪策略。首先，设计了一种改进式广义积分器与延时相消相结合的混合滤波器结构，提高原有广义积分器的滤波性能和动态响应能力，并可消除直流偏置及不平衡分量的影响。其次，通过引入前馈补偿的改进锁相环消除频率波动引起的误差，实现频率自适应谐波检测。最后，基于频率波动导致的谐波跟踪误差，采用结合无限脉冲响应滤波器的快速重复控制，可依据检测频率实现动态调整。仿真和实验结果表明，所提出的控制策略在充电负荷侧可稳定地检测电网频率。且在频率波动的工况下具有较优的谐波补偿能力，在32 ms实现对谐波电流的补偿，治理后电流谐波畸变率下降到5%以下，对不同工况下的充电站具有通用性。 |
| 关键词: 充电站谐波 频率自适应 有源电力滤波 广义积分器 延时相消 |
| DOI：10.19783/j.cnki.pspc.240488 |
| 投稿时间：2024-04-22修订日期：2024-07-25 |
| 基金项目:国家重点研发计划项目资助(2021YFB1600200)；长安大学中央高校基本科研业务费专项资金资助(300102383203) |
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| Frequency adaptive active power filtering control strategy based on harmoniccharacteristics of a charging station |
| XU Xianfeng,MA Wenhao,LU Yong,YU Yang,ZHANG Zhen |
| (School of Energy and Electrical Engineering, Chang’an University, Xi’an 710064, China) |
| Abstract: |
| With the connection of distributed new energy to a charging station, the random characteristics of source and load cause fluctuations in the fundamental frequency of the power grid, aggravating the risk of harmonic current off-limit in the station. Therefore, a frequency adaptive active power filter harmonic detection and tracking strategy is proposed. First, a hybrid filter structure combining an improved generalized integrator and delay signal cancellation is designed to enhance the filtering performance and dynamic response capability of the original generalized integrator, and to eliminate the influence of DC bias and unbalanced components. Secondly, by introducing an improved phase locked loop with feedforward compensation, the error caused by frequency fluctuations is eliminated, achieving frequency adaptive harmonic detection. Finally, based on the harmonic tracking error caused by frequency fluctuations, a fast repetitive control combined with an infinite impulse response filter is proposed. This can be dynamically adjusted according to the detection frequency. The simulation and experimental results show that the proposed control strategy can stably detect the grid frequency on the charging load side, and has better harmonic compensation ability in conditions of frequency fluctuation. It can compensate for harmonic currents in 32 ms and reduce the current total harmonic distortion to less than 5% after treatment, and it is universal for charging stations in different operating conditions. |
| Key words: charging station harmonics frequency adaptation active power filtering generalized integrator delay signal cancellation |
