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考虑光伏动态特性的功角电压交互失稳机理分析
作者:
作者单位:

1.电网安全与节能国家重点实验室(中国电力科学研究院有限公司),北京市 100192;2.国家电力调度控制中心,北京市 100031;3.国家电网有限公司华北分部,北京市 100053

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基金项目:

国家重点研发计划资助项目(2016YFB0900805);国家电网有限公司科技项目“±1 100 kV直流输电关键技术研究与示范”(国家项目配套)。


Analysis on Instability Mechanism of Power Angle and Voltage Interaction Considering Dynamic Characteristics of Photovoltaic Generator
Author:
Affiliation:

1.State Key Laboratory of Power Grid Safety and Energy Conservation (China Electric Power Research Institute),Beijing 100192, China;2.National Electric Power Dispatching and Control Center, Beijing 100031, China;3.North China Branch of State Grid Corporation of China, Beijing 100053, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2016YFB0900805) and State Grid Corporation of China.

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    摘要:

    在大容量直流和高比例新能源集中接入电网的背景下,研究了考虑光伏动态特性影响的直流大功率扰动引发功角电压交互失稳问题。首先,从理论上推导了两机等值系统发电机转子运动方程和电动机负荷运动方程;然后,分析了直流大功率扰动引发功角和电压交互作用导致系统失稳的物理机理;最后,进一步分析了光伏低电压穿越期间不同有功/无功特性对系统稳定性的影响规律,通过吉泉直流实际系统算例进行了仿真验证。研究结果表明,两侧发电机功角拉开和负荷母线电压跌落(电动机电阻减小)形成恶性循环最终导致系统失稳,不同的光伏低电压穿越有功/无功特性对系统稳定性的影响需要通过理论结合仿真综合分析。

    Abstract:

    Under the background of centralized access of large-capacity DC systems and high-penetration renewable energy, this paper studies the problem of power angle and voltage interaction instability resulted by the large power disturbance of DC system considering the impact of dynamic characteristics of photovoltaic generator. Firstly, the motion equations of generator rotor and motor load of the two-machine equivalent system are derived in theory. Then, the physical mechanisms of the system instability caused by power angle and voltage interaction after large-power disturbance of DC system are analyzed. Finally, the impacts of different active/reactive power characteristics of photovoltaic generator during low voltage ride-through (LVRT) process on the system stability are studied. The results are verified through the simulation of Changji-Guquan HVDC system. The study results show that the system instability is eventually resulted by the vicious circle between the relative power angle increase of generator and the load-bus voltage drop (i.e. the decrease of motor resistance). And the impact of different active/reactive power characteristics of photovoltaic generator during LVRT process on the system stability should be comprehensively analyzed by theory combined with simulation.

    图1 吉泉直流送端电网结构Fig.1 Structure of the sending-end grid of Changji-Guquan HVDC system
    图2 吉泉直流连续换相失败引发的功角、电压失稳Fig.2 Power angle and voltage instability after continuous commutation failure ofChangji-Guquan HVDC system
    图3 两机等值系统Fig.3 Two-machine equivalent system
    图4 发电机和电动机特性曲线Fig.4 Characteristic curves of generator and motor
    图5 不同工况下吉泉直流连续换相失败仿真曲线Fig.5 Simulation curves after continuous commutation failure of Changji-Guquan HVDC system under different conditions
    图6 光伏低穿特性对稳定性影响的仿真对比Fig.6 Simulation comparison about impact of low voltage ride-through characteristics of photovoltaic generator on stability
    图 光伏低穿特性对稳定性的影响机理分析Fig. Mechanism analysis about impact of low voltage ride-through characteristics of photovoltaic generator on stability
    表 1 不同类型光伏的低穿特性Table 1 Different types of low voltage ride-through characteristics of photovoltaic generator
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引用本文

屠竞哲,易俊,王超,等.考虑光伏动态特性的功角电压交互失稳机理分析[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190809002.
TU Jingzhe,YI Jun,WANG Chao,et al.Analysis on Instability Mechanism of Power Angle and Voltage Interaction Considering Dynamic Characteristics of Photovoltaic Generator[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190809002.

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  • 收稿日期:2019-08-09
  • 最后修改日期:2020-04-18
  • 录用日期:2019-12-30
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