Analysis of Operating Voltage Characteristics of UHV Transformer Medium-Voltage Side Reactive Power Compensation

2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2) Pub Date : 2020-10-30 DOI:10.1109/ei250167.2020.9347325

Jun Ma, Hongqiao Yu, Tianlin Lu, X. Cai, Lei Zhang, Jing Ye, Zhenhua Li, Yuehua Huang

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Abstract

The UHV transformers reactive power compensation(RPC) is equipped with two types of medium-voltage side compensation(MSC) and low-voltage side compensation(LSC). The LSC scheme commonly used in China does not conform to the MSC scheme adopted by relevant international standards. The compensation effect and equipment investment are different between these two schemes. Focusing on the 1000kV UHV autotransformer developed by Chinese, this paper theoretically analyzes reactive power loss(RPL) during operation and the influence of MSC/LSC on the operating voltage(OV). Then simulation is carried out with PSCAD/EMTDC software, analyzing and comparing the fluctuation level and compensation effect of each bus voltage when RPC is performed on different sides of the UHV transformer. The results show that the voltage fluctuation(OF) generated by the RPC on the medium-voltage side of the main transformer is lower than that on the low-voltage side, and the higher the compensable capacity, the smaller the equipment footprint and cycle investment.

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特高压变压器中压侧无功补偿工作电压特性分析

特高压变压器无功补偿分为中压侧补偿(MSC)和低压侧补偿(LSC)两种。中国常用的LSC方案不符合相关国际标准采用的MSC方案。两种方案的补偿效果和设备投资不同。本文以我国研制的1000kV特高压自耦变压器为研究对象，从理论上分析了其运行过程中的无功损耗(RPL)以及mscs /LSC对运行电压(OV)的影响。然后利用PSCAD/EMTDC软件进行仿真，分析比较了在特高压变压器不同侧进行RPC时各母线电压的波动水平和补偿效果。结果表明:RPC在主变中压侧产生的电压波动小于低压侧，且可补偿容量越高，设备占地面积和周期投资越小。

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2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2)

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