光伏并网逆变器模型预测直接功率控制方法研究

doi:10.11985/2016.06.003

摘要/Abstract

摘要：

根据瞬时功率理论,建立了光伏并网逆变器在旋转dq坐标系下的功率预测模型。采样并网电压、电流后,利用该模型能够直接预测出并网输出的有功功率和无功功率。然后,利用模型预测控制方法,选用预测功率与给定功率误差的绝对值之和作为价值函数,根据功率预测模型,选择最优空间电压矢量,设计了光伏并网逆变器的模型预测直接功率控制策略。该控制策略无需使用PWM调制模块和内环电流控制,计算量小,易于实现。在光照强度稳定、变化等条件下,对控制系统的性能进行了仿真。结果表明,并网逆变器能够跟踪光照变化快速输出有功、无功功率,具有较好的动、静态性能,验证了所提出的控制策略的有效性。

关键词: 光伏发电, 并网逆变器, 预测模型, 直接功率预测控制

Abstract:

Based on the instantaneous power theory, power predictive model of photovoltaic grid connected inverter in dq rotating coordinates is established. The output active power and reactive power of the grid-connected can be directly predicted by using the predictive model. The model predictive direct power control strategy of photovoltaic grid connected inverter is designed. According to the power predictive model and cost function, the optimal space voltage vector is selected. The proposed control strategy does not need PWM modulation module and the inner current control. It has low computational complexity and is easy to be implemented. The control system performance is simulated in different light intensity conditions. The simulation results show that the grid-connected inverter can track illumination change and output power with good dynamic and static performance, which validate the effectiveness of proposed control strategy.

Key words: Photovoltaic power generation, grid-connected inverter, predictive model, direct power predictive control

中图分类号:

TM464

金楠,邓轩轩,崔光照,窦智峰. 光伏并网逆变器模型预测直接功率控制方法研究[J]. 电气工程学报, 2016, 11(6): 13-18.

Jing Nan,Deng Xuanxuan,Cui Guangzhao,Dou Zhifeng. A Model Predictive Direct Power Control Method for Photovoltaic Grid-Connected Inverter[J]. Journal of Electrical Engineering, 2016, 11(6): 13-18.

图/表 7

图1

图2

图3

图4

图5

表

图6

参考文献 16

[1]	Timbus A, Liserre M, Teodorescu R , et al. Evalua- tion of current controllers for distributed power generation systems[J]. IEEE Transactions on Power Electronics, 2009,24(3):654-664. doi: 10.1109/TPEL.2009.2012527
[2]	Maza-Ortega J M, Gomez Exposito A, Barragan Villarejo M , et al. Voltage source converter-based topologies to further integrate renewable energy sources in distribution systems[J]. IET Renewable Power Generation, 2012,6(6):435-445. doi: 10.1049/iet-rpg.2011.0246
[3]	Zeng Qingrong, Chang Liuchen . An advanced SVPWM-based predictive current controller for three-phase inverters in distributed generation systems[J]. IEEE Transactions on Industrial Electronics, 2008,55(3):1235-1246. doi: 10.1109/TIE.2007.907674
[4]	Mao Huifeng, Yang Xu, Chen Zenglu , et al. A hysteresis current controller for single-phase three-level voltage source inverters[J]. IEEE Transactions on Power Electronics, 2012,27(7):3330-3339. doi: 10.1109/TPEL.2011.2181419
[5]	Moreno J C, Huerta J M E, Gil R G , et al. A robust predictive current control for three-phase grid-connected inverters[J]. IEEE Transactions on Industrial Electronics, 2009,56(6):1993-2004. doi: 10.1109/TIE.41
[6]	Cortes P, Rodriguez J, Silva C , et al. Delay compensation in model predictive current control of a three-phase inverter[J]. IEEE Transactions on Industrial Electronics, 2012,59(2):1323-1325. doi: 10.1109/TIE.2011.2157284
[7]	Hu Jiefeng, Zhu Jianguo, Dorrell David G . Model predictive control of inverters for both islanded and grid-connected operations in renewable power generations[J]. IET Renewable Power Generation, 2014,8(3):240-248. doi: 10.1049/iet-rpg.2013.0078
[8]	Rodriguez J, Kazmierkowski M P, Espinoza J R , et al. State of the art of finite control set model predictive control in power electronics[J]. IEEE Transactions on Industrial Informatics, 2013,9(2):1003-1016. doi: 10.1109/TII.2012.2221469
[9]	Rodriguez Jose, Pont Jorge, Silva Cesar A , et al. Predictive current control of a voltage source inverter[J]. IEEE Transactions on Industrial Electronics, 2007,54(1):495-503. doi: 10.1016/j.isatra.2015.10.007 pmid: 26549566
[10]	Karamanakos P, Geyer T, Manias S . Direct model predictive current control strategy of dc-dc Boost converters[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2013,1(4):337-346. doi: 10.1109/JESTPE.2013.2279855
[11]	Riar B S, Geyer T, Madawala U K . Model predictive direct current control of modular multilevel converters: modeling, analysis, and experimental evaluation[J]. IEEE Transactions on Power Electronics, 2015,30(1):431-439. doi: 10.1109/TPEL.2014.2301438
[12]	沈坤, 章兢, 王玲 , 等. 三相电压型逆变器模型预测控制[J]. 电工技术学报, 2013,28(12):283-289.
	Shen Kun, Zhang Jinwang, Wang Ling , et al. Model predictive control of three-phase voltage source inverter[J]. Transactions of China Electrotechnical Society, 2013,28(12):283-289.
[13]	杨勇, 赵方平, 阮毅 , 等. 三相并网逆变器模型电流预测控制技术[J]. 电工技术学报, 2011,26(6):153-159.
	Yang Yong, Zhao Fangping, Ruan Yi , et al. Model current predictive control for three-phase grid-connected inverters[J]. Transactions of China Electrotechnical Society, 2011,26(6):153-159.
[14]	Hu Jiefeng, Zhu Jianguo, Dorrell David G . Model-predictive direct power control of doubly-fed induction generators under unbalanced grid voltage conditions in wind energy applications[J]. IET Renewable Power Generation, 2014,8(6):687-695. doi: 10.1049/iet-rpg.2013.0312
[15]	Yaramasu V, Bin Wu, Jin Chen . Model-predictive control of grid-tied four-level diode-clamped inverters for high-power wind energy conversion systems[J]. IEEE Transactions on Power Electronics, 2014,29(6):2861-2873. doi: 10.1109/TPEL.2013.2276120
[16]	周小杰, 阮毅, 汪飞 . 单相并网变换器预测直接功率控制策略研究[J]. 中国电机工程学报, 2014,34(30):5269-5276. doi: 10.13334/j.0258-8013.pcsee.2014.30.002
	Zhou Xiaojie, Ruan Yi, Wang Fei . A predictivedirect power control scheme for single-phase grid-connected converters[J]. Proceedings of the CSEE, 2014,34(30):5269-5276. doi: 10.13334/j.0258-8013.pcsee.2014.30.002

参数	数值
直流母线电压U_dc/V	380
光伏电池板开路电压U_d/V	468
网侧滤波电感L/mH	15
电网相电压e/V	150
电网频率f/Hz	50
直流母线电容C/μF	3 000
采样频率f_s/kHz	20