基于电流反馈的同步逆变器功率解耦控制策略

doi:10.11985/2018.08.004

摘要/Abstract

摘要：

同步逆变器通过模拟同步电机内部机理和外部特性使其对电网具有天然友好的特性,但其有功功率和无功功率之间存在的耦合会加剧同步频率谐振,容易引发功率振荡,导致系统不稳定。本文首先建立同步逆变器功角特性的小信号模型,分析产生功率耦合的机理。在此基础上,针对功率耦合问题提出了一种新型的功率解耦控制方法：通过添加反馈电流环对耦合功率进行动态补偿,将引起耦合的动态功率量转换成动态电流的形式,消除了由功率耦合引起的动态功率振荡和虚拟同步控制的稳态误差,并对加入反馈电流环的控制系统进行了稳定性分析,最后通过仿真验证了该方法的有效性和可行性。

关键词: 同步逆变器, 功角特性, 功率耦合, 反馈电流环, 动态电流

Abstract:

Synchronverter has natural friendly characteristics to the grid by simulating the internal mechanism and external feature of the synchronous motor, however, the coupling between active and reactive power intensifies synchronous frequency resonance, triggers power oscillations and results system instability. Therefore, the small signal model of the synchronverter power angle characteristics is firstly established to analyze the production mechanism of the power coupling. Aiming at the problem of power coupling, a new power decoupling control method is proposed. The coupling power is dynamically compensated by adding a feedback current loop, realizing the way that convert the dynamic power quantity which causes the coupling into the form of dynamic current, and eliminating the steady-state error and dynamic power oscillation of virtual synchronization control caused by power coupling. The stability analysis of the control system with feedback current loop is presented. Simulation are given to show the validity and feasibility of the proposed control strategy.

Key words: Synchronverter, power angle characteristics, power coupling, feedback current loop, dynamic current

中图分类号:

TM464

陈冰,朱鸿章,陶旋,吴军. 基于电流反馈的同步逆变器功率解耦控制策略[J]. 电气工程学报, 2018, 13(8): 18-25.

Chen Bing,Zhu Hongzhang,Tao Xuan Wu Jun,Wu Jun. Power Decoupling Control Strategy of Synchronverter Based on Current Feedback[J]. Journal of Electrical Engineering, 2018, 13(8): 18-25.

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参考文献 25

[1]	范松丽, 苑仁峰, 艾芊 , 等. 欧洲超级电网计划及其对中国电网建设启示[J]. 电力系统自动化, 2015,39(10):6-15.
	Fan Songli, Yuan Renfeng, Ai Qian , et al. European supergrid project and its enlightenment to China’s power grid[J]. Automation of Electric Power Systems, 2015,39(10):6-15.
[2]	黄林彬, 章雷其, 辛焕海 , 等. 下垂控制逆变器的虚拟功角稳定机理分析[J]. 电力系统自动化, 2016,40(12):117-123.
	Huang Linbin, Zhang Leiqi, Xin Huanhai , et al. Multi-rate real-time simulation method based on RTDS and FPGA co-simulation platform[J]. Automation of Electric Power Systems, 2016,40(12):117-123.
[3]	赵杨阳, 柴建云, 孙旭东 , 等. 基于虚拟同步发电机的柔性虚拟调速器模型[J]. 电力系统自动化, 2016,40(10):8-15.
	Zhao Yangyang, Chai Jianyun, Sun Xudong , et al. Flexible virtual covernor model based on virtual synchronous generator[J]. Automation of Electric Power Systems, 2016,40(10):8-15.
[4]	Balaguer I J, Lei Q, Yang S , et al. Control for grid-connected and intentional islanding operations of distributed power generation[J]. IEEE Transactions on Industrial Electronics, 2011,58(1):147-157. doi: 10.1109/TIE.2010.2049709
[5]	胡超, 张兴, 石荣亮 , 等. 独立微电网中基于自适应权重系数的VSG协调控制策略[J]. 中国电机工程学报, 2017,37(2):516-524.
	Hu Chao, Zhang Xing, Shi Rongliang , et al. VSG coordinated control based on adaptive weight factors in islanded microgrids[J]. Proceedings of the CSEE, 2017,37(2):516-524.
[6]	王克, 王泽忠, 柴建云 , 等. 同步控制逆变电源并网预同步过程分析[J]. 电力系统自动化, 2015,39(12):152-158.
	Wang Ke, Wang Zezhong, Chai Jianyun , et al. Analysis of grid-connecting pre-synchronized process for synchronously controlled inverter power source[J]. Automation of Electric Power Systems, 2015,39(12):152-158.
[7]	吕志鹏, 盛万兴, 钟庆昌 , 等. 虚拟同步发电机及其在微电网中的应用[J]. 中国电机工程学报, 2014,34(16):2591-2603. doi: 10.13334/j.0258-8013.pcsee.2014.16.009
	Lü Zhipeng, Sheng Wanxing, Zhong Qingchang , et al. Virtual synchronous generator and its applications in micro-grid[J]. Proceedings of the CSEE, 2014,34(16):2591-2603. doi: 10.13334/j.0258-8013.pcsee.2014.16.009
[8]	陈来军, 王任, 郑天文 , 等. 基于参数自适应调节的虚拟同步发电机暂态响应优化控制[J]. 中国电机工程学报, 2016,36(21):5724-5731.
	Chen Laijun, Wang Ren, Zheng Tianwen , et al. Optimal control of transient response of virtual synchronous generator based on adaptive parameter adjustment[J]. Proceedings of the CSEE, 2016,36(21):5724-5731.
[9]	郑天文, 陈来军, 陈天一 , 等. 虚拟同步发电机技术及展望[J]. 电力系统自动化, 2015,39(21):165-175.
	Zheng Tianwen, Chen Laijun, Chen Tianyi , et al. Review and prospect of virtual synchronous generator technologies[J]. Automation of Electric Power Systems, 2015,39(21):165-175.
[10]	El-Saadawi M, Hatata A . A novel protection scheme for synchronous generator stator windings based on SVM[J]. Protection & Control of Modern Power Systems, 2017,2(1):24. doi: 10.4142/jvs.2019.20.e58 pmid: 31775185
[11]	Bevrani H, Ise T, Miura Y . Virtual synchronous generators: a survey and new perspectives[J]. International Journal of Electrical Power & Energy Systems, 2014,54(1):244-254. doi: 10.1038/s41598-019-53664-7 pmid: 31772191
[12]	Zhong Q C, Weiss G . Synchronverters: inverters that mimic synchronous generators[J]. IEEE Transactions on Industrial Electronics, 2011,58(4):1259-1267. doi: 10.1109/TIE.2010.2048839
[13]	金鹏, 艾欣, 王永刚 . 采用势函数法的微电网无功控制策略[J]. 中国电机工程学报, 2012,32(25):44-51.
	Jin Peng, Ai Xin, Wang Yonggang . Reactive power control strategy of microgird using potential function method[J]. Proceedings of the CSEE, 2012,32(25):44-51.
[14]	李鹏, 杨世旺, 王阳 , 等. 基于相对增益分析的目标函数对角化微网功率解耦控制方法[J]. 中国电机工程学报, 2014,34(13):2039-2046. doi: 10.13334/j.0258-8013.pcsee.2014.13.004
	Li Peng, Yang Shiwang, Wang Yang , et al. Objective function diagonalization decoupling control of microgrid power based on relative gain analysis[J]. Proceedings of the CSEE, 2014,34(13):2039-2046. doi: 10.13334/j.0258-8013.pcsee.2014.13.004
[15]	荆龙, 黄杏, 吴学智 . 改进型微源下垂控制策略研究[J]. 电工技术学报, 2014,29(2):145-152.
	Jin Long, Huang Xin, Wu Xuezhi . Research on improved microsource droop control method[J]. Transactions of China Electrotechnical Society, 2014,29(2):145-152.
[16]	郑永伟, 陈民铀, 李闯 , 等. 自适应调节下垂系数的微电网控制策略[J]. 电力系统自动化, 2013,37(7):6-11. doi: 10.7500/AEPS201203084
	Zheng Yongwei, Chen Minyou, Li Chuang , et al. A microgrid control strategy based on adaptive drooping coefficient adjustment[J]. Automation of Electric Power Systems, 2013,37(7):6-11. doi: 10.7500/AEPS201203084
[17]	Alipoor J, Miura Y, Ise T . Power system stabilization using virtual synchronous generator with alternating moment of inertia[J]. IEEE Journal of Emerging & Selected Topics in Power Electronics, 2015,3(2):451-458. doi: 10.1109/JBHI.2019.2954003 pmid: 31751255
[18]	Shintai T, Miura Y, Ise T . Oscillation damping of a distributed generator using a virtual synchronous generator[J]. IEEE Transactions on Power Delivery, 2014,29(2):668-676. doi: 10.1109/TPWRD.2013.2281359
[19]	Ashabani M , Mohamed A R I. Integrating VSCs to weak grids by nonlinear power damping controller with self-synchronization capability[J]. IEEE Transactions on Power Systems, 2014,29(2):805-814. doi: 10.1109/TPWRS.2013.2280659
[20]	Li M, Wang Y, Xu N, et al. A power decoupling control strategy for droop controlled inverters and virtual synchronous generators [C]. IEEE Power Electronics and Motion Control Conference, 2016: 1713-1719.
[21]	李武华, 王金华, 杨贺雅 , 等. 虚拟同步发电机的功率动态耦合机理及同步频率谐振抑制策略[J]. 中国电机工程学报, 2017,37(2):381-390.
	Li Wuhua, Wang Jinhua, Yang Heya , et al. Power dynamic coupling mechanism and resonance suppression of synchronous frequency for virtual synchronous generators[J]. Proceedings of the CSEE, 2017,37(2):381-390.
[22]	Machowski J, Bialek J W, Bumby J R . Power system dynamics. stability and control[M]. John Wiley, 2012.
[23]	张玉治, 张辉, 贺大为 , 等. 具有同步发电机特性的微电网逆变器控制[J]. 电工技术学报, 2014,29(7):261-268.
	Zhang Yuzhi, Zhang Hui, He Dawei , et al. Control strategy of micro grid converters with synchronous generator characteristic[J]. Transactions of China Electrotechnical Society, 2014,29(7):261-268.
[24]	Brown E, Weiss G . A study of the use of synchronverters for grid stabilization using simulations in SimPower[D]. Tel: Tel Aviv University. 2015.
[25]	Natarajan V, Weiss G. Almost global asymptotic stability of a constant field current synchronous machine connected to an infinite bus[C]. IEEE Decision and Control, 2014: 3272-3279.

参数	数值
L_s/mH,R_s/Ω	0.45,0.27
C /μF	22
L_g/mH	0.45
直流侧电压V_dc/V	700
电网电压U_g/V	220
D_p	5
D_q	50
K	128.066 2
J/kg·m²	0.000 405 2
电流环PI参数	k_p= 2,k_i= 30