1.国网冀北电力有限公司电力科学研究院;2.国网冀北电力有限公司电力调控中心;3.南京南瑞继保电气有限公司
新能源场站部署分布式调相机是提升电源侧全过程电压支撑能力的有效措施,然而调相机采用目前“无功外环+电压内环”级联策略接入场站AVC后制约其低频段电压源特性。本文首先阐述调相机接入AVC现存问题,提出了调相机全过程定电压需求,然后基于含分布式调相机的新能源场站拓扑结构解析了调相机无功电压折算系数以及无功分流影响因子关系式,提出了调相机“定电压+无功分流抑制”接入AVC新方案,在国内某主流厂家设备型号完成程序开发,并通过调相机励磁、场站AVC双控制器硬件在环仿真验证了方案的有效性。最终在某实际新能源场站完成工程化应用,现场运行结果表明,本方案实现了场站多类型无功设备稳态调节,有效降低场站并网点电压波动幅值的同时,充分发挥了调相机全过程电压源特性,保障了系统电压稳定裕度。
It is an effective measure to improve the whole process voltage support ability of the power supply side to deploy the distributed synchronous condenser (SC) in renewable energy station. However, the current "reactive outer loop + voltage inner loop" cascade strategy is adopted to integrate the SC to the automatic voltage control system (AVC) of the station to restrict its low-frequency voltage source characteristics. This paper first describes the existing problems of SC access to the AVC of the station, and proposes the requirement of constant voltage in the whole process of SC. Then, based on the topology of the renewable energy station with SC, the reactive voltage conversion coefficient and the reactive power shunt influence factor are analyzed. Based on this, a new scheme of "constant voltage + reactive power shunt suppression" for integrating the SC to the AVC is proposed. The program was developed in a domestic mainstream manufacturer's equipment model, and the effectiveness of the scheme was verified by in-loop simulation of the SC and AVC dual controller at the station. Finally, the engineering application was completed in an actual new energy station. The field operation results show that the scheme realizes the steady-state regulation of AVC multi-type reactive power equipment of the station, effectively reduces the voltage fluctuation amplitude of PCC bus of the station, gives full play to the whole process voltage control of the SC, and guarantees the voltage stability margin of the system.
[1] | 梁浩,秦川,谢欢,等.基于分布式调相机的电压支撑型新能源场站构建方案——(二)协调控制策略与试验验证[J/OL].电力系统自动化,http://doi. org/[doi]. LIANG Hao, QIN Chuan, XIE Huan, et al. Construction Scheme of Voltage Supported Renewable Energy Station Based on Distributed Synchronous Condenser——(II) Coordinate Control Strategy and Test Verification[J/OL]. Automation of Electric Power Systems, http://doi. org/[doi]. |