| 引用本文: | 陈 磊,庄 俊,王志远,等.柔性直流输电系统的变速抽水蓄能机组直流电压辅助控制策略[J].电力系统保护与控制,2022,50(4):154-162.[点击复制] |
| CHEN Lei,ZHUANG Jun,WANG Zhiyuan,et al.Auxiliary control strategy of DC voltage for variable speed pumped storage unitsin an HVDC transmission system[J].Power System Protection and Control,2022,50(4):154-162[点击复制] |
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| 摘要: |
| 柔性直流输电是新能源并网消纳的主要输电形式。由于新能源出力波动性会导致柔性直流输电系统的直流电压波动，影响其安全稳定运行。为了有效抑制柔性直流输电系统中直流电压波动，提出变速抽水蓄能机组直流电压辅助控制策略｡首先建立了变速抽水蓄能机组、四端柔性直流电网、风电场及光伏电站的仿真模型。其次，以直流电压偏差乘以相应系数作为变速抽水蓄能机组有功功率参考值微增量，且通过低通滤波器滤去直流电压稳态分量对直流电压辅助控制的影响，提出基于直流电压辅助控制的变速抽水蓄能机组有功功率控制策略。最后，以变速抽水蓄能机组电动和发电工况为例，对变速抽水蓄能机组抑制柔性直流输电系统直流电压波动能力进行仿真，并与传统直接功率控制策略进行对比分析。仿真结果表明新能源出力波动引起的直流电压波动频率集中在10 Hz以下，且所提变速抽水蓄能机组控制策略可以有效抑制柔性直流系统直流电压波动。 |
| 关键词: 变速抽水蓄能机组 柔性直流输电系统 辅助电压控制 可再生能源并网 |
| DOI：DOI: 10.19783/j.cnki.pspc.210486 |
| 投稿时间：2021-04-26修订日期：2021-08-09 |
| 基金项目:国家电网公司科技项目资助(NY71-18-013)；国网新源公司科技项目资助(SGXYFNOOJDJS 1800005) |
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| Auxiliary control strategy of DC voltage for variable speed pumped storage unitsin an HVDC transmission system |
| CHEN Lei,ZHUANG Jun,WANG Zhiyuan,WU Wei,XIE Ningning,LI Hui |
| (1. Hebei Fengning Pumped Storage Co., Ltd., Chengde 068350, China; 2. China Electric Power Research Institute Co., Ltd.
(Jiangsu Research Center of Energy Storage Converter and Application Engineering Technology), Nanjing 210003, China;
3. State Key Laboratory of Power Transmission and Distribution Equipment and System Safety and
New Technology, Chongqing University, Chongqing 400044, China) |
| Abstract: |
| HVDC transmission is the main transmission form for grid connection and consumption of new energy. Because of the fluctuation of new energy output, the DC voltage fluctuation of an HVDC transmission system will affect its safe and stable operation. To effectively suppress this DC voltage fluctuation, a DC voltage auxiliary control strategy using a variable-speed pumped storage unit is proposed. First, the simulation models of the variable-speed pumped storage unit, four terminal HVDC power grid, wind farm and photovoltaic power station are established. Secondly, the DC voltage deviation multiplied by the corresponding coefficient is used as the micro increment of the active power reference value of the variable-speed pumped storage unit. The influence of the steady-state component of the DC voltage on the DC voltage auxiliary control is filtered through the low-pass filter. An active power control strategy of the variable-speed pumped storage unit based on the DC voltage auxiliary control is proposed. Finally, taking the electric and power generation conditions of a variable-speed pumped storage unit as an example, the ability of the variable-speed pumped storage unit to suppress DC voltage fluctuation is simulated and compared with the traditional direct power control strategy. The simulation results show that the DC voltage fluctuation frequency caused by the output fluctuation of new energy is concentrated below 10 Hz, and the variable speed pumped storage unit control strategy proposed in this paper can effectively suppress the DC voltage fluctuation of an HVDC system.
This work is supported by the Science and Technology Project of State Grid Corporation of China (No. NY71-18-013). |
| Key words: variable-speed pumped storage unit HVDC transmission system auxiliary voltage control renewable energy integration |
