引用本文: | 李宗隆,柏 舸,胡 剑,等.考虑光热光伏混合电站内外双重电压安全的两阶段无功优化控制[J].电力系统保护与控制,2023,51(20):170-179.[点击复制] |
LI Zonglong, BAI Ge1, HU Jian,et al.Two-stage optimal reactive power control considering internal-external dual voltage security of a PV-CSP hybrid power station[J].Power System Protection and Control,2023,51(20):170-179[点击复制] |
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摘要: |
针对实际运行的大规模光热光伏混合电站并网后面临的“内忧外患”电压问题,既受电站内部节点电压状态的影响,也受外部电网系统静态电压稳定状态的影响,提出一种考虑光热光伏混合电站内外双重电压安全的两阶段无功优化控制方法。首先,通过静态电压稳定裕度、节点电压均衡度和无功储备裕度3种指标表征混合电站电压安全状态。然后,结合小时级长时间尺度的光伏出力预测信息,在第I阶段实施有载变压器和电容器慢速调整。针对分钟级短时间尺度内的光伏出力波动,以混合电站内的光伏发电单元、光热发电单元和静止同步补偿器为第II阶段的优化控制对象,实现快速精细化电压调节。所提方法能有效避免全站设备频繁参与优化调整,从而提高控制效率。最后,通过测试系统验证分析结果表明:通过两阶段无功控制协调,所提方法能够抑制光伏出力的波动冲击,有效降低站内电压安全越限和失稳风险。 |
关键词: 光热光伏混合电站 内外双重电压安全 静态电压稳定 无功控制 两阶段优化 |
DOI:10.19783/j.cnki.pspc.236168 |
投稿时间:2023-04-01修订日期:2023-07-10 |
基金项目:国家自然科学基金项目资助(51907164);重庆市教委科学技术研究项目资助(KJQN202100221);国家电网公司科技项目资助(SGCQBS00FZJS2310318) |
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Two-stage optimal reactive power control considering internal-external dual voltage security of a PV-CSP hybrid power station |
LI Zonglong1,BAI Ge11,HU Jian2,3,CHEN Xingyu1,CHEN Hongbo1,OUYANG Jinxin3,XIONG Xiaofu3 |
(1. Bishan Power Supply Branch of State Grid Chongqing Electric Power Company, Chongqing 402760, China;
2. College of Engineering and Technology, Southwest University, Chongqing 400715, China;
3. Chongqing University, Chongqing 400044, China) |
Abstract: |
The practical operation of large-scale photovoltaic (PV)-concentrated solar power (CSP) hybrid power stations is faced with internal and external voltage problems after they are connected to the power grid. This is affected not only by the voltage state of the nodes inside the station, but also by the stability state of static voltages of the external power system. To address these problems, this paper proposes a two-stage optimal reactive power control method considering internal-external dual voltage security of the PV-CSP hybrid power station. First, the voltage security state of the hybrid power station is characterized by three indices: the margin of static voltage stability, the degree of node voltage balance, and the margin of reactive power reserve. Second, based on the information of long-term hourly PV output forecasts, the slow adjustment of on-load tap changer and capacitor banks is implemented in stage I. For the fluctuation of PV output at the short-term minute level, the PV and CSP power generation units and the static synchronous compensators within the hybrid power station serve as the control targets for optimization in stage II, intending to achieve rapid and precise voltage regulation. The proposed method effectively avoids the frequent optimization and regulation of all station equipment, thereby improving control efficiency. Finally, the analysis results on the test system demonstrate that, through the coordination of two-stage reactive power controls, the proposed method can mitigate the impact of PV power output fluctuation and reduce the over-limit risk of station voltage security and the risk of voltage instability. |
Key words: photovoltaic-concentrated solar power hybrid power station internal-external dual voltage security static voltage stability reactive power control two-stage optimization |