Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace

doi:10.12096/j.2096-4528.pgt.19141

Abstract

Abstract:

A large number of photovoltaic grid-connection brings many harmonic resonance problems to the power grid. A joint model including photovoltaic converter and grid equivalent impedance was established for the photovoltaic converter resonance problem. The s-domain model of photovoltaic converter impedance and grid impedance was derived. The photovoltaic output current contains not only the voltage frequency component but also the resonant component of the photovoltaic impedance by using the inverse Laplace transform. The stochastic subspace method was used to analyze the modal components of photovoltaic grid-connection points and currents. The impedance modes of photovoltaic converters were extracted according to the difference between the two modes. Finally, the effectiveness of the proposed method was verified by simulation and experimental data analysis.

Key words: photovoltaic, converter, equivalent impedance of power grid, resonance, stochastic subspace, mode

CLC Number:

TK01
TM712

Jianhua ZHU, Zhenqing LI, Lichang XU. Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace[J]. Power Generation Technology, 2021, 42(2): 201-206.

Figures/Tables 8

Fig.1 Equivalent diagram of the converter integrated into the grid

Fig.2 Node system diagram of a simple equivalent system

Fig.3 System impedance modal calculation process

Fig.4 d-axis current amplitude and frequency diagram

Fig.5 d-axis voltage amplitude and frequency diagram

Fig.6 q-axis voltage amplitude and frequency diagram

Fig.7 Wind farm outlet voltage amplitude

Fig.8 Wind farm outlet current amplitude

References 18

1	曾令华, 程亮, 张靖宗. 交流变频调速系统仿真建模及谐波特性分析[J]. 发电技术, 2019, 40 (3): 294- 299.
	ZENG L H , CHENG L , ZHANG J Z . Simulation model of AC variable frequency speed regulation system and harmonic characteristics analysis[J]. Power Generation Technology, 2019, 40 (3): 294- 299.
2	冯远鹏, 王久和, 李建国, 等. 弱电网条件下LCL型Vienna整流器控制策略研究[J]. 发电技术, 2019, 40 (3): 286- 293.
	FENG Y P , WANG J H , LI J G , et al. Control strategy of Vienna rectifier with LCL filter under weak grid conditions[J]. Power Generation Technology, 2019, 40 (3): 286- 293.
3	吴明哲, 陈武晖. VSC-HVDC稳定控制研究[J]. 发电技术, 2019, 40 (1): 28- 39.
	WU M Z , CHEN W H . Overview of research on stability and control of VSC-HVDC[J]. Power Generation Technology, 2019, 40 (1): 28- 39.
4	刘家庆, 徐峥. 大电网运行控制面临的形势、问题与挑战[J]. 发电技术, 2018, 39 (6): 493- 498.
	LIU J Q , XU Z . The situation, problems and challenges of large power grid operation and control[J]. Power Generation Technology, 2018, 39 (6): 493- 498.
5	于笑, 陈武晖. 风力发电并网系统次同步振荡研究[J]. 发电技术, 2018, 39 (4): 304- 312.
	YU X , CHEN W H . Review of subsynchronous oscillation induced by wind power generation integrated system[J]. Power Generation Technology, 2018, 39 (4): 304- 312.
6	王一珺, 杜文娟, 陈晨, 等. 基于复转矩系数法研究并网双馈风电场引发电力系统次同步振荡问题综述[J]. 发电技术, 2018, 39 (3): 195- 203.
	WANG Y J , DU W J , CHEN C , et al. A review of investigations on sub-synchronous oscillations in power systems caused by DFIG wind farms based on the complex torque coefficients method[J]. Power Generation Technology, 2018, 39 (3): 195- 203.
7	孙长江, 杨文斌, 李华, 等. 海上风电场谐振分析的实用计算方法[J]. 广东电力, 2018, 31 (6): 75- 83.
	SUN C J , YANG W B , LI H , et al. Practical calculation method for harmonic resonance analysis of offshore wind farm[J]. Guangdong Electric Power, 2018, 31 (6): 75- 83.
8	SUN J . Impedance-based stability criterion for grid-connected inverters[J]. IEEE Transactions on Power Electronics, 2011, 26 (11): 3075- 3078. DOI URL
9	XU W , HUANG Z Y , YU C , et al. Harmonic resonance mode analysis[J]. IEEE Transactions on Power Delivery, 2005, 20 (2): 1182- 1190. DOI
10	徐文远, 张大海. 谐波共振评估的一种模态分析方法[J]. 中国电机工程学报, 2005, 25 (22): 89- 93. DOI
	XU W Y , ZHANG D H . A modal analysis method for harmonic resonance assessment[J]. Proceedings of the CSEE, 2005, 25 (22): 89- 93. DOI
11	王喜莲, 程迪, 王顺. 基于输出阻抗建模的并网系统低阶谐波预测模型[J]. 电机与控制学报, 2019, 23 (6): 18- 26.
	WANG X L , CHENG D , WANG S . Low harmonics prediction model of grid-connected system based on output impedance modeling[J]. Electric Machines and Control, 2019, 23 (6): 18- 26.
12	MOHAMED B. Stability criteria for AC power systems with regulated loads[D]. Washington: George Washington University, 1997.
13	徐方维, 郑鸿儒, 杨洪耕, 等. 基于无相位实测数据的系统侧谐波阻抗估计方法[J]. 电力系统自动化, 2019, 43 (21): 170- 176. DOI
	XU F W , ZHENG H R , YANG H G , et al. Harmonic impedance estimation method on system side based on measurement data without phase angle[J]. Automatic of Electric Power System, 2019, 43 (21): 170- 176. DOI
14	唐振东, 杨洪耕. 基于模态分析的并网风电场谐波谐振研究[J]. 电力自动化设备, 2017, 37 (3): 87- 92.
	TANG Z D , YANG H G . Harmonic resonance research based on modal analysis for grid-connected wind farms[J]. Electric Power Automation Equipment, 2017, 37 (3): 87- 92.
15	严干贵, 段双明, 叶德武, 等. 基于输出阻抗的三相LCL型光伏逆变器稳定性分析[J]. 太阳能学报, 2018, 39 (2): 558- 566.
	YAN G G , DUAN S M , YE D W , et al. Stability analysis of three-phase LCL-type photovoltaic inverter based on the output impedance[J]. Acta Energiae Solaris Sinica, 2018, 39 (2): 558- 566.
16	方刚, 杨勇, 卢进军, 等. 三相光伏并网逆变器电网高阻抗谐振抑制方法[J]. 电力自动化设备, 2018, 38 (2): 109- 116.
	FANG G , YANG Y , LU J J , et al. Resonance suppression method of high impedance power grid for three-phase photovoltaic grid-connected inverters[J]. Electric Power Automation Equipment, 2018, 38 (2): 109- 116.
17	段建东, 汪鑫鑫, 卢俊, 等. 基于ATP的HVDC系统建模及谐波分析[J]. 智慧电力, 2019, 47 (11): 9- 15. DOI
	DUAN J D , WANG X X , LU J , et al. ATP based HVDC system modeling and harmonic analysis[J]. Smart Power, 2019, 47 (11): 9- 15. DOI
18	周邦友, 胡绍全, 杜强. 特征系统实现算法中的模型定阶方法研究[J]. 科学技术与工程, 2009, 9 (10): 2715- 2722. DOI
	ZHOU B Y , HU S Q , DU Q , et al. Study about calculating the order of model in eigen-system realization algorithm[J]. Science Technology and Engineering, 2009, 9 (10): 2715- 2722. DOI

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