| 考虑变工况的光伏下垂控制与二级电容响应的调频策略 |
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| 引用本文：李华1,东琦2,李旭东1.考虑变工况的光伏下垂控制与二级电容响应的调频策略[J].电网与清洁能源,2023,39(10):137~146 |
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| 基金项目:国家电网有限公司总部科技项目（5400-202216414A-2-0-ZN） |
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| 中文摘要:电网中大量新能源替代常规同步发电机机组导致系统惯性时间常数降低，调频能力不足，频率波动增大。基于光伏机组高度可控特性，提出一种考虑变工况的光伏下垂控制与二级电容响应的调频策略。模拟传统调频过程，策略同时考虑惯性响应和下垂控制响应，由直流电容和光伏减载备用分别承担两项调频功率，最大化利用调频资源。所提策略通过运用改进频率变化率测量法，优化惯性响应；通过光照参数估算确定实际最大功率值，以适应变化运行工况；自适应下垂系数能适应光伏实际出力，在可用功率范围内向上/向下调整系统频率。PSCAD仿真验证表明，所提策略能够最大化利用光伏现有调频资源，对于变化工况的适应性良好，能够在不超光伏运行极限基础上有效改善系统频率响应。 |
| 中文关键词:光伏机组 频率调节 减载控制 下垂控制 光强估算 |
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| The Frequency Regulation Strategy for Photovoltaic Droop Control and Secondary Capacitor Response Considering Changing Working Conditions |
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| Abstract:Large amount of photovoltaic access to the grid leads to lower inertia time constants of the system， insufficient frequency regulation capacity and increased frequency fluctuations. Due to the highly controllable nature of PV units， a frequency regulation strategy for photovoltaic droop control and secondary capacitor response considering changing working conditions is proposed. Simulating the conventional frequency regulation process， this strategy takes both inertial response and droop control response into account . The two frequency regulation powers are assumed by the DC capacitor and the PV deloading backup respectively， which may maximize the utilization of frequency regulation resources. The proposed strategy optimizes the inertial response by applying an improved frequency rate of change measurement. To adapt to changing operating conditions， the actual maximum power value is determined by estimating the illumination parameters. The set adaptive droop factor adapts to the actual PV power output， adjusting the system frequency upward/downward within the available power range. The PSCAD simulations show that the proposed strategy can maximize the utilization of the existing frequency modulation resources of photovoltaic， and has good adaptability to changing operating conditions， which can effectively improve the system frequency response without exceeding the PV operating limit. |
| keywords:photovoltaic units frequency regulation deloading control droop control illumination estimation |
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