| 引用本文: | 刘刚,张扬,高志军,等.基于不对称分析的高压链式STATCOM的低压穿越控制策略[J].电力系统保护与控制,2015,43(21):112-119. |
| LIU Gang,ZHANG Yang,GAO Zhijun,et al.Low voltage ride through control strategy of high voltage cascaded STATCOM based on asymmetric analysis[J].Power System Protection and Control,2015,43(21):112-119 |
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| 摘要: |
| 作为新能源电站的主要无功补偿和电压支撑设备，高压链式静止同步补偿器(STATCOM)也需具备低电压穿越的能力，特别是三相电网电压不对称故障的低压穿越能力。为解决此难题，采用对称分量法分别分析了电网侧和换流链侧，并推导出数学公式，结合该公式提出了一种基于负序电流注入的高压链式STATCOM的低电压穿越控制策略。该策略包含了控制算法和控制逻辑，能够满足三相电网对称以及不对称下的跌落工况。通过仿真和试验，验证了该方法的有效性，并将其应用于工程实践中。 |
| 关键词: 不平衡分析 低电压穿越 负序电流注入 链式STATCOM |
| DOI：10.7667/j.issn.1674-3415.2015.21.018 |
| 分类号: |
| 基金项目:国家电网公司2014年科技项目“静止同步发电机(SSG)技术及应用前期研究” |
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| Low voltage ride through control strategy of high voltage cascaded STATCOM based on asymmetric analysis |
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LIU Gang, ZHANG Yang, GAO Zhijun, SUN Jian, ZHANG Jian
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Xuji Group Corporation, XJ Electric Co., Ltd., Xuchang 461000, China
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| Abstract: |
| As a key electric equipment for reactive power compensation and voltage support in new energy substations, high voltage cascaded STATCOM needs low-voltage ride-through (LVRT) capacity, especially under the asymmetrical fault of three-phase grid voltage. To solve this problem, this paper analyzes grid side and conversion chain side respectively by using symmetrical component method and deduces a mathematical formula. And based on the formula, a LVRT control strategy of high voltage cascaded STATCOM based on negative-sequence current injection is proposed. The proposed strategy includes control algorithm and control logics, which can satisfy voltage-drop under both three-phase symmetric and asymmetric grid. The validity of the method is verified by simulations and experiments, and it has been applied in engineering application. |
| Key words: asymmetry analysis LVRT negative-sequence current injection cascaded STATCOM |
