中压兆瓦级电网模拟器电压采样影响及改进策略*

doi:10.11985/2021.04.026

电气工程学报 ›› 2021, Vol. 16 ›› Issue (4): 205-212.doi: 10.11985/2021.04.026

• 新能源发电与电能存储 • 上一篇下一篇

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中压兆瓦级电网模拟器电压采样影响及改进策略^*

孙勇¹^,²(), 苏建徽¹(), 赖纪东¹(), 王庆发¹^,²(), 董磊¹^,²()

1.合肥工业大学光伏系统教育工程研究中心合肥 230009
2.常州中海电力科技有限公司常州 213001

收稿日期:2021-04-18 修回日期:2021-10-17 出版日期:2021-12-25 发布日期:2022-02-10
通讯作者: 孙勇 E-mail:975464026@qq.com;su_chen@126.com;laijidong@126.com;116407035@qq.com;406863799@qq.com
作者简介:* 孙勇,男,1995年生,硕士研究生。主要研究方向为电力电子技术及电网模拟器。E-mail： 975464026@qq.com
苏建徽,男,1963年生,博士,教授。主要研究方向为光伏发电、微网、储能及电力传动技术。E-mail： su_chen@126.com
赖纪东,男,1981年生,博士,副教授。主要研究方向为分布式发电与微电网技术、电力变换节能技术。E-mail： laijidong@126.com
王庆发,男,1994年生,硕士研究生。主要研究方向为电力电子技术及微电网控制技术。E-mail： 116407035@qq.com
董磊,男,1994年生,硕士研究生。主要研究方向为兆瓦级逆变器及其控制策略。E-mail： 406863799@qq.com
基金资助:
* 中央科研基本业务支持资助项目(PA2020GDGP0053)

Voltage Sampling Influence and Improvement Strategy of Medium Voltage Megawatt Power Grid Simulator

SUN Yong¹^,²(), ¹(), LAI Jidong¹(), WANG Qingfa¹^,²(), DONG Lei¹^,²()

1. The Ministry of Education Photovoltaic System Engineering Research Center, Hefei University of Technology, Hefei 230009
2. Changzhou Sino Sea Electric Power Technology Co., Ltd., Changzhou 213001

Received:2021-04-18 Revised:2021-10-17 Online:2021-12-25 Published:2022-02-10
Contact: SUN Yong E-mail:975464026@qq.com;su_chen@126.com;laijidong@126.com;116407035@qq.com;406863799@qq.com

摘要/Abstract

摘要：

为测试光伏电站、风电机组以及储能电站等兆瓦级、中压直挂式并网发电系统的电网适应性能力,介绍一种35 kV/3 MW电网模拟器拓扑。然而,受电压互感器(Potential transformer,PT)采样精度限制,直接采用PT输出信号作为电压调节器反馈,会严重降低系统的控制带宽,影响系统输出电压的动、稳态性能。根据PT特性进行频域建模,分析PT采样对系统控制的影响,并提出一种改进的控制策略,将PT输出电压作为有效值环反馈来保证稳态精度,同时增加高带宽低压瞬时值采样控制来跟踪电压指令,以使电网模拟器的输出特性满足要求。35 kV/3 MW电网模拟器的试验样机验证了该控制方案的可行性和正确性。

关键词: 中压电网模拟器, 电压互感器, 低压瞬时值反馈, 电压有效值反馈

Abstract:

In order to test the grid adaptability of MW-level and medium voltage direct-connected grid connected power generation systems such as photovoltaic power station, wind turbine and pumped storage plant, a 35 kV/3 MW grid simulator topology is introduced. However, limited by the sampling accuracy of potential transformer (PT), the direct use of PT output signal as the feedback of voltage regulator will seriously reduce the control bandwidth of the system and affect the dynamic and steady-state performance of the system output voltage. The frequency domain modeling is carried out according to the characteristics of PT, the influence of PT sampling on the system control is analyzed, and an improved control strategy is proposed. The output voltage of PT is used as the feedback of the effective value loop to ensure the steady-state accuracy. At the same time, the high-bandwidth and low-voltage instantaneous value sampling control is added to track the voltage command, so that the output characteristics of the power grid simulator can meet the requirements. The experimental prototype of 35 kV/3 MW power grid simulator verifies the feasibility and correctness of the control scheme.

Key words: Medium voltage power grid simulator, potential transformer, low voltage instantaneous value feedback, voltage RMS feedback

中图分类号:

TM464

孙勇, 苏建徽, 赖纪东, 王庆发, 董磊. 中压兆瓦级电网模拟器电压采样影响及改进策略^*[J]. 电气工程学报, 2021, 16(4): 205-212.

SUN Yong, , LAI Jidong, WANG Qingfa, DONG Lei. Voltage Sampling Influence and Improvement Strategy of Medium Voltage Megawatt Power Grid Simulator[J]. Journal of Electrical Engineering, 2021, 16(4): 205-212.

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参数	数值
系统相电压U_o/kV	20.207
直流电压U_d/V	700
额定频率/Hz	50
额定功率/MW	3
变压器变比	0.4/5.2
变压器漏感L₁₁/mH	0.01
励磁电感/mH	1.5
滤波电感L₁/mH	0.6
滤波电容C₁/μF	120

参数	数值
额定电压/kV	35
额定容量/MVA	3
高电压穿越测试功能	暂态输出电压110%~130%
低电压穿越测试功能	暂态输出电压5%~90%
稳态电压偏差	≤±1%
阶跃响应调节时间/ms	≤10
输出谐波调节功能	2~7次,单次精度≤±0.3% 8~25次,单次精度≤±3%
输出频率调节范围	45~60 Hz,精度为0.01 Hz

中压兆瓦级电网模拟器电压采样影响及改进策略^*

Voltage Sampling Influence and Improvement Strategy of Medium Voltage Megawatt Power Grid Simulator

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