谐波注入法在柔性直流电网工程中的应用
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摘要
柔性直流电网技术的应用将是应对全球清洁能源大规模开发的有效技术手段。针对高压大容量柔性直流电网工程受制于电力电子器件自身的通流或关断能力导致电流安全裕度较小的问题,将谐波注入法应用于柔性直流电网工程。通过在正弦波调制的基础上注入3次谐波的方法,提高直流电压利用率,降低同等容量下电力电子器件的电流应力。本文基于张北四端柔性直流电网示范工程搭建RT-LAB实时数模混合仿真系统进行实验,结果表明所提方法具备工程应用推广价值,有利于推动高压大容量柔性直流电网的工程应用。
The application of flexible DC grid technology will be an effective technical means to cope with the largescale development of global clean energy. A high-voltage and large-capacity flexible DC grid project is usually constrained by the current flow or shutdown capability of the power electronic device itself,resulting in a smaller current safety margin. To solve this problem,harmonic injection method is applied to the flexible DC grid project. By injecting the third harmonic wave to the sinusoidal modulation,the DC voltage utilization rate can be improved,thus reducing the current stress of the power electronic device under the same capacity. Based on the demonstration project of Zhangbei four-terminal flexible DC grid,an RT-LAB real-time digital-analog hybrid simulation system is built. Results show that the proposed method has values of engineering application,which is beneficial to the promotion of engineering applications of high-voltage and large-capacity flexible DC grid.
The application of flexible DC grid technology will be an effective technical means to cope with the largescale development of global clean energy. A high-voltage and large-capacity flexible DC grid project is usually constrained by the current flow or shutdown capability of the power electronic device itself,resulting in a smaller current safety margin. To solve this problem,harmonic injection method is applied to the flexible DC grid project. By injecting the third harmonic wave to the sinusoidal modulation,the DC voltage utilization rate can be improved,thus reducing the current stress of the power electronic device under the same capacity. Based on the demonstration project of Zhangbei four-terminal flexible DC grid,an RT-LAB real-time digital-analog hybrid simulation system is built. Results show that the proposed method has values of engineering application,which is beneficial to the promotion of engineering applications of high-voltage and large-capacity flexible DC grid.
引文
[1]李斌,何佳伟,冯亚东,等(Li Bin,He Jiawei,Feng Yadong,et al).多端柔性直流电网保护关键技术(Key techniques for protection of multi-terminal flexible DC grid)[J].电力系统自动化(Automation of Electric Power Systems),2016,40(21):2-12.
[2]赵倩,张群,严兵,等(Zhao Qian,Zhang Qun,Yan Bing,et al).柔性直流输电系统控制策略及动模试验(Control strategy and dynamic simulation test of VSC-HVDC system)[J].电力建设(Electric Power Construction),2015,36(12):57-62.
[3]李岩,罗雨,许树楷,等(Li Yan,Luo Yu,Xu Shukai,et al).柔性直流输电技术:应用、进步与期望(VSCHVDC transmission technology:application,advancement and expectation)[J].南方电网技术(Southern Power System Technology),2015,9(1):7-13.
[4]乐波,梅念,刘思源,等(Yue Bo,Mei Nian,Liu Siyuan,et al).柔性直流输电技术综述(Overview of HVDC flexible)[J].中国电业:技术版(China Electric Power:Technology Edition),2014(5):43-47.
[5]薛士敏,张超,高博,等(Xue Shiming,Zhang Chao,Gao bo,et al).基于模块化多电平换流器的直流电网保护方案(Protection scheme for DC grid based on modular multilevel converter)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2018,30(3):8-16.
[6]王东冬,丁稳房,苏威,等(Wang Dongdong,Ding Wenfang,Su Wei,et al).级联多电平STATCOM的三次谐波注入PWM法(The PWM technology of third harmonic injection based on the cascade multilevel STATCOM)[J].湖北工业大学学报(Journal of Hubei University of Technology),2015,30(1):15-17,35.
[7] Li Rui,Fletcher J E,Williams B W. Influence of third harmonic injection on modular multilevel converter-based highvoltage direct current transmission systems[J]. IET Generation,Transmission and Distribution,2016,10(11):2764-2770.
[8]王珊珊,周孝信,汤广福,等(Wang Shanshan,Zhou Xiaoxin,Tang Guangfu,et al).模块化多电平换流器HVDC直流双极短路子模块过电流分析(Analysis of submodule overcurrent caused by DC pole-to-pole fault in modular multi-level converter HVDC system)[J].中国电机工程学报(Proceedings of the CSEE),2011,31(1):1-7.
[9]刘莉(Liu Li).注入3次谐波的SPWM调制算法的实现与验证(Realization and verification of SPWM modulation algorithm with third harmonic injection)[J].电气应用(Electrotechnical Application),2017,36(17):72-74.
[10]张超华,汤雨,谢少军(Zhang Chaohua,Tang Yu,Xie Shaojun).改进Z源逆变器的三次谐波注入控制策略(Third harmonic injection control strategy of improved Zsource inverter)[J].电工技术学报(Transactions of China Electrotechnical Society),2009,24(11):114-119,126.
[11]秦桑(Qin Sang).三次谐波注入应用于MMC-HVDC的研究(Study on application of third harmonic injection in MMC-HVDC)[J].浙江电力(Zhejiang Electrical Power),2015(7):5-9.
[2]赵倩,张群,严兵,等(Zhao Qian,Zhang Qun,Yan Bing,et al).柔性直流输电系统控制策略及动模试验(Control strategy and dynamic simulation test of VSC-HVDC system)[J].电力建设(Electric Power Construction),2015,36(12):57-62.
[3]李岩,罗雨,许树楷,等(Li Yan,Luo Yu,Xu Shukai,et al).柔性直流输电技术:应用、进步与期望(VSCHVDC transmission technology:application,advancement and expectation)[J].南方电网技术(Southern Power System Technology),2015,9(1):7-13.
[4]乐波,梅念,刘思源,等(Yue Bo,Mei Nian,Liu Siyuan,et al).柔性直流输电技术综述(Overview of HVDC flexible)[J].中国电业:技术版(China Electric Power:Technology Edition),2014(5):43-47.
[5]薛士敏,张超,高博,等(Xue Shiming,Zhang Chao,Gao bo,et al).基于模块化多电平换流器的直流电网保护方案(Protection scheme for DC grid based on modular multilevel converter)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2018,30(3):8-16.
[6]王东冬,丁稳房,苏威,等(Wang Dongdong,Ding Wenfang,Su Wei,et al).级联多电平STATCOM的三次谐波注入PWM法(The PWM technology of third harmonic injection based on the cascade multilevel STATCOM)[J].湖北工业大学学报(Journal of Hubei University of Technology),2015,30(1):15-17,35.
[7] Li Rui,Fletcher J E,Williams B W. Influence of third harmonic injection on modular multilevel converter-based highvoltage direct current transmission systems[J]. IET Generation,Transmission and Distribution,2016,10(11):2764-2770.
[8]王珊珊,周孝信,汤广福,等(Wang Shanshan,Zhou Xiaoxin,Tang Guangfu,et al).模块化多电平换流器HVDC直流双极短路子模块过电流分析(Analysis of submodule overcurrent caused by DC pole-to-pole fault in modular multi-level converter HVDC system)[J].中国电机工程学报(Proceedings of the CSEE),2011,31(1):1-7.
[9]刘莉(Liu Li).注入3次谐波的SPWM调制算法的实现与验证(Realization and verification of SPWM modulation algorithm with third harmonic injection)[J].电气应用(Electrotechnical Application),2017,36(17):72-74.
[10]张超华,汤雨,谢少军(Zhang Chaohua,Tang Yu,Xie Shaojun).改进Z源逆变器的三次谐波注入控制策略(Third harmonic injection control strategy of improved Zsource inverter)[J].电工技术学报(Transactions of China Electrotechnical Society),2009,24(11):114-119,126.
[11]秦桑(Qin Sang).三次谐波注入应用于MMC-HVDC的研究(Study on application of third harmonic injection in MMC-HVDC)[J].浙江电力(Zhejiang Electrical Power),2015(7):5-9.