基于UPFC/BESS的大电网新能源系统功率波动柔性跟踪控制研究

摘要

随着新能源发电技术的快速发展,对大电网新能源系统灵活交流输电技术提出了新的要求.为了解决大电网新能源发电波动性、间歇性及负荷突变等引起的功率波动和电网稳定问题,提出了一种新型基于蓄电池储能系统(battery energy storage system,BESS)接入的统一潮流控制器(unified power flow controller,UPFC)装置.建立了含风电、光伏发电和UPFC/BESS的大电网新能源系统数学模型,基于广域测量系统(wide area measurement system,WAMS)技术设计出UPFC/BESS关于抑制新能源电力功率波动的柔性跟踪控制方法,该方法使储能装置柔性交换系统的有功功率和无功功率,消除了有功波动对节点电压的影响.基于PSCAD/EMTDC平台的仿真结果表明,UPFC/BESS具有较强的有功调节控制能力,能够快速抑制大电网新能源接入系统的负荷与电源功率波动.%With the quick development of new energy generation technology,new requirements are put forward for the flexible AC transmission technology of new energy power system.In order to solve the power fluctuations and grid stability problems caused by the power generation volatility,intermittency and load change of new power system of large power grid,this paper proposes a new unified power flow controller (UPFC) based on the battery energy storage system (BESS) access.We construct the mathematical model for new power system of large power grid including wind power,photovoltaic power generation and UPFC/BESS,and design the flexible tracking control method for UPFC/BESS based on wide area measurement system (WAMS),in order to inhibit the power fluctuation of new energy.The method can make energy storage device flexibly switch the active power and reactive power of system,and eliminate the influence of active fluctuation on the node voltage.The simulation results based on PSCAD/EMTDC platform show that UPFC/BESS has strong ability of active regulation,and can quickly adjust fluctuation problem of load and power supply caused by the new power system accessing of large power grid.