首页|基于构网型逆变器的光伏有功备用控制策略

基于构网型逆变器的光伏有功备用控制策略

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光伏机组采用构网型逆变器并网是戈壁荒漠新能源电网稳定运行的关键.为解决传统光伏减载运行受辐照度影响大、保留功率不精准等问题,提出了基于构网型逆变器的光伏有功备用控制策略.首先,设计了含参考阵列和备用阵列的光伏并网结构.其次以双级式光伏拓扑结构为基础,在前级DC/DC引入有功备用控制,在后级DC/AC引入构网型控制策略,实现光伏机组主动参与电网频率调节;控制策略引入直流电容电压恒定控制,维持直流电压的同时,增强光伏机组的惯量特性.最后建立构网型光伏逆变器小信号模型,通过根轨迹分析了直流电容值对光伏频率响应的影响.仿真结果验证了所提控制策略的正确性和可行性.
Standby control strategy for PV generation based on grid-forming inverter
The use of grid-forming inverters for grid-connection of photovoltaic units is the key to stable operation of the new energy grid in desert and gobi.The conventional PV load-shedding operation is greatly affected by irradiance and inaccurate power retention.To solve these problems,a PV active standby control strategy based on grid-configuration inverter is proposed.Firstly,a PV grid-connected structure containing reference and backup arrays is designed.Secondly,based on the two-stage PV topology,an active backup control is introduced at the front stage DC/DC and a grid-forming control strategy is introduced at the back stage DC/AC to realize active participation of PV units in grid frequency regulation.The control strategy introduces a constant DC capacitor voltage control to maintain the DC voltage while enhancing the inertia characteristics of the PV unit.Finally,the PV small signal model of the grid-forming inverter is established,and the influence of DC capacitor value on the PV frequency response is analyzed through the root trajectory.The simulation results verify the correctness and feasibility of the proposed control strategy.

PV active standbygrid-forming controlDC capacitor voltage controlfrequency responsestability control

付雪姣、胡登辉、刘占彪、陈来军、张扬帆、苏小玲

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国网冀北电力有限公司电力科学研究院,北京 100045

青海大学新能源电力系统智慧运行教育部重点实验室,青海 西宁 810016

清华大学电机工程与应用电子技术系,北京 100084

光伏有功备用 构网型控制 直流电容电压控制 频率响应 稳定性控制

国家电网有限公司总部管理科技项目

5108-202218280A-2-305-XG

2024

热力发电
西安热工研究院有限公司,中国电机工程学会

热力发电

CSTPCD北大核心
影响因子:0.765
ISSN:1002-3364
年,卷(期):2024.53(8)