| 引用本文: | 卫程超,赵晋斌,曾志伟,等.光伏波动下低压直流系统功率振荡抑制研究[J].电力系统保护与控制,2023,51(5):128-138. |
| WEI Chengchao,ZHAO Jinbin,ZENG Zhiwei,et al.Power oscillation suppression of a low voltage DC system under photovoltaic fluctuation[J].Power System Protection and Control,2023,51(5):128-138 |
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| 摘要: |
| 针对低压直流系统中光伏波动造成的功率振荡问题，基于RLC阻抗网络模型小扰动稳定分析方法，提出一种采用电压前馈的控制策略。通过在电流环中引入直流电压比例分量，对电流环电流进行补偿，减小因输入侧变化导致的电流波动，实现了在光照波动较强条件下对系统功率振荡的抑制。理论分析结果表明：所提方法可有效减小谐振峰值和低频阻抗幅值，降低光伏波动较强时的系统功率振荡，使系统在光照强度变化较大情况下能够保持稳定运行。最后，通过仿真验证了理论分析的正确性和所提方法的有效性。 |
| 关键词: 低压直流系统 功率振荡 RLC阻抗网络 小干扰稳定性 电压前馈 |
| DOI：10.19783/j.cnki.pspc.220722 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(52177184)；上海市2021年度“科技创新行动计划”科技支撑碳达峰碳中和专项(第一批)资助(21DZ1207502) |
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| Power oscillation suppression of a low voltage DC system under photovoltaic fluctuation |
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WEI Chengchao1, ZHAO Jinbin1, ZENG Zhiwei1, LIU Zhenxiang1, MAO Ling1, QU Keqing1, JIA Wei2
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1. College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
2. Shanghai Solar Energy Research Center Co., Ltd., Shanghai 201100, China
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| Abstract: |
| There is a problem of power oscillation caused by photovoltaic fluctuation in a low voltage direct current system. Thus this paper proposes a voltage feedforward control strategy based on the small disturbance stability analysis method of an RLC impedance network model. This compensates for the DC voltage proportional component in the current loop to reduce the current fluctuation caused by the change in the input side. The power oscillation of the system is suppressed in the condition of strong illumination fluctuation. The results show that the proposed method can effectively reduce the resonant peak and low-frequency impedance amplitude, suppress the power oscillation when the photovoltaic fluctuation is strong, and make it operate stably when the illumination intensity changes greatly. Finally, the correctness of the theoretical analysis and the effectiveness of the proposed method are verified by simulation.
This work is supported by the National Natural Science Foundation of China (No. 52177184). |
| Key words: low voltage direct current system power oscillation RLC impedance network small disturbance stability voltage feedforward |
