| 引用本文: | 徐 岩,邹 南,马天祥.逆变型分布式电源接入配电网单相断线故障零序电压分析[J].电力系统保护与控制,2022,50(2):41-51.[点击复制] |
| XU Yan,ZOU Nan,MA Tianxiang.Analysis of zero-sequence voltage of a single-phase disconnection fault of inverter interfaced distributed generation connected to a distribution network[J].Power System Protection and Control,2022,50(2):41-51[点击复制] |
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| 摘要: |
| 随着绝缘导线的大量应用，配电网发生断线故障概率增加。针对逆变类分布式电源(Inverter Interfaced Distributed Generation, IIDG)对传统断线故障特性产生影响这一问题，分析并仿真验证了IIDG接入配电网发生断线故障时的故障特征。首先，建立了含IIDG配电网故障模型，推导得出单相断线不接地、单相断线电源侧接地以及单相断线负荷侧接地三种故障形态下的断口两侧零序电压表达式。其次，通过绘制相量图的方法，分析了故障位置、过渡电阻以及IIDG输出特性对系统侧零序电压分布的影响。最后，分析了IIDG不同额定容量下零序电压的变化情况。理论分析结果表明，只有故障点下游的IIDG才会对零序电压分布轨迹产生影响。仿真结果验证了所述分析方法的合理性以及分析结果的正确性。 |
| 关键词: 配电网 IIDG 断线 零序电压 相量图 |
| DOI：DOI: 10.19783/j.cnki.pspc.210419 |
| 投稿时间：2021-04-15修订日期：2021-10-29 |
| 基金项目:河北省科技计划项目资助(20314301D)；国家电网公司科技项目资助(kj2020-064) |
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| Analysis of zero-sequence voltage of a single-phase disconnection fault of inverter interfaced distributed generation connected to a distribution network |
| XU Yan,ZOU Nan,MA Tianxiang |
| (1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power
University), Baoding 071003, China; 2. State Grid Hebei Electric Power Co., Ltd. Research Institute, Shijiazhuang 050021, China) |
| Abstract: |
| With the large-scale application of insulated wires, the probability of disconnection faults in the distribution network has increased. Given the problem of the influence of inverter interfaced distributed generation (IIDG) on the characteristics of traditional disconnection faults, this paper analyzes and simulates to verify the fault characteristics of the disconnection fault when the IIDG is connected to the distribution network. First, a fault model of the distribution network containing IIDG is established, and the zero sequence voltage expressions are derived for both sides of the fracture under three fault forms: single-phase disconnection without grounding, single-phase disconnection power-side grounding, and single-phase disconnection load-side grounding. Secondly, by drawing a phasor diagram, the influence of fault location, transition resistance and output characteristics of IIDG on the zero sequence voltage distribution on the system side is analyzed. Finally, the changes of zero-sequence voltage under different rated capacities of IIDG are analyzed. Theoretical analysis results show that only the IIDG downstream of the fault point can affect the zero-sequence voltage distribution trajectory. The simulation results verify the rationality of the analysis described in this paper and the correctness of the analysis results.
This work is supported by the Science & Technology Program of Hebei Province (No. 20314301D). |
| Key words: distribution network IIDG disconnection zero-sequence voltage phasor diagram |
