多电压等级交直流配电系统潮流分析

doi:10.12204/j.issn.1000-7229.2020.10.005

电力建设 ›› 2020, Vol. 41 ›› Issue (10): 38-46.doi: 10.12204/j.issn.1000-7229.2020.10.005

多电压等级交直流配电系统潮流分析

王肖肖¹, 韩民晓¹, 曹文远¹, 谢文强¹, 肖峰¹, 李蕊², 秦剑华³

1.新能源电力系统国家重点实验室(华北电力大学), 北京市 102206
2.中国电力科学研究院有限公司,北京市 100192
3.国网江苏省有限公司电力科学研究院, 南京市 211103

收稿日期:2020-04-05 出版日期:2020-10-01 发布日期:2020-09-30
通讯作者: 韩民晓
作者简介:王肖肖(1995),男,硕士研究生,主要研究方向为直流配电网潮流分析;|曹文远(1994),男,博士研究生,主要研究方向为电力电子在电力系统中的应用;|谢文强(1993),男,博士研究生,主要研究方向为电力电子在电力系统中的应用;|肖峰(1996),男,硕士研究生,主要研究方向为电力电子在电力系统中的应用;|李蕊(1978),女,教授级高级工程师,主要研究方向为直流配电、电力系统分析及新能源接入;|秦剑华(1991),男,工程师,主要研究方向为电力电子在电力系统中的应用。
基金资助:
国家重点研发计划项目(2018YFB0904700)

Power Flow Analysis of AC/DC Distribution System with Multiple Voltage Levels

WANG Xiaoxiao¹, HAN Minxiao¹, CAO Wenyuan¹, XIE Wenqiang¹, XIAO Feng¹, LI Rui², QIN Jianhua³

1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Beijing 102206 , China
2. China Electric Power Research Institute, Beijing 100192, China
3. Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China

Received:2020-04-05 Online:2020-10-01 Published:2020-09-30
Contact: HAN Minxiao
Supported by:
National Key Research and Development Program of China(2018YFB0904700)

摘要/Abstract

摘要：

随着分布式电源及直流负荷的发展,兼具安全、可靠、高效的交直流混合配电网将成为未来配电网发展的一种重要形式。基于电压源型换流器的直流配电网具有可控性强、电能质量问题少、经济性好等优点,但同时也引入了有别于交流配电网的潮流计算问题。为此,文章首先建立了考虑换流器损耗以及直流变换器损耗的潮流计算模型,并给出损耗参数计算方法。其次介绍了直流系统潮流模型的求解方法,重点考虑了电压源型换流器和DC/DC变换器控制方式对潮流计算的影响,针对不同的控制策略给出不同的潮流求解方法,并给出了当潮流越限时几种有效的解决措施。最后利用IEEE 33节点直流配电网算例验证了提出的损耗模型的正确性和潮流求解方法的有效性。

关键词: 交直流系统, 电压源换流器, DC/DC变换器, 潮流计算

Abstract:

With the development of distributed generation and DC loads, a safe, reliable, and efficient AC-DC hybrid distribution network will become an important form for future development of distribution network. The DC distribution network based on the voltage source converter has the advantages of strong controllability, few power quality problems, and good economy. At the same time, it also introduces a problem of power flow calculation that is different from the AC distribution network. This paper firstly establishes a model for power flow calculation that takes into account inverter losses and DC converter losses, and gives calculation method for loss parameters. Secondly, the method for solving the DC power flow model is introduced. When analyzing the power flow of the DC system, the influence of control method of the voltage source converter and the DC / DC converter on the power flow calculation is mainly considered. Different power flow solving methods are given for different control strategies. Several effective solutions are given when the flow exceeds the limit. Finally, an IEEE 33-node DC distribution network example is used to verify the correctness of the loss model proposed in this paper and the effectiveness of the power flow solution method.

Key words: AC/DC system, voltage source converter, DC/DC converter, power flow calculation

中图分类号:

TM744

王肖肖, 韩民晓, 曹文远, 谢文强, 肖峰, 李蕊, 秦剑华. 多电压等级交直流配电系统潮流分析[J]. 电力建设, 2020, 41(10): 38-46.

WANG Xiaoxiao, HAN Minxiao, CAO Wenyuan, XIE Wenqiang, XIAO Feng, LI Rui, QIN Jianhua. Power Flow Analysis of AC/DC Distribution System with Multiple Voltage Levels[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(10): 38-46.

图/表 16

图1 VSC换流站模型

Fig.1 Model of VSC converter station

图2 VSC等效电路

Fig.2 Equivalent circuit of VSC

表1 VSC控制方式以及在潮流计算中等效方式

Table 1 VSC control modes and equivalent methods in load flow calculation

图3 直流变换器统一稳态模型

Fig.3 Unified steady-state model of DC converter

图4 ISOP模型与IPOS模型

Fig.4 ISOP model and IPOS model

图5 直流变换器π值等效模型

Fig.5 π-type equivalent model for DC converter

表2 直流变换器的控制方式以及在潮流计算中的等效方式

Table 2 DC converter control modes and equivalent methods in power flow

图6 下垂控制特性曲线

Fig.6 Characteristic curve of droop control

图7 IEEE 33节点交直流网络

Fig.7 IEEE 33-node AC / DC network

表3 场景1下直流变换器占空比以及换流器调制比数据

Table 3 Duty cycle of DC converter and modulation ratio of inverter under scenario 1

表4 场景2下直流变换器占空比以及换流器调制比数据

Table 4 Duty cycle of DC converter and modulation ratio of inverter under scenario 2

表5 切换控制方式前换流器流通功率

Table 5 Converter power without control mode switching

表6 切换控制方式后换流器流通功率

Table 6 Converter power after control mode switching

表A1 VSC损耗参数

Table A1 VSC loss parameters

表A2 场景1下DC/DC变换器的控制方式及子模块类型

Table A2 DC / DC converter control methods and submodule types under scenario 1

表A3 场景2 下DC/DC直流变换器的控制方式及子模块类型

Table A3 DC converter control methods and submodule types under scenario 2

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多电压等级交直流配电系统潮流分析

Power Flow Analysis of AC/DC Distribution System with Multiple Voltage Levels

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