摘要
将传统的三相光伏并网逆变器外环直流电压控制策略中PI调节器的输出变量归纳为两种,即交流相电流参考值和有功功率参考值,对应为内环交流电流控制与功率控制。并基于直流电容能量守恒,提出一种新型外环控制方法——直流功率控制。该方法将直流电压给定值平方与实际采样值平方之差作为PI调节器的输入变量,PI调节器的输出变量即为给定功率。通过理论分析描述传统方法和该文方法的差异,并通过实验研究验证该方法在电网电压波动条件下的优势。
In this paper,the outputs of PI regulator in the traditional outer loop DC voltage control strategy of threephase grid-connected inverters are divided into two kinds,namely the AC current reference and DC active power reference,corresponds to the AC current control mode(CCM)and power control mode(PCM),respectively.Based on the energy conservation law of DC side capacitor,this paper proposes a novel outer loop control method,the DC power control(DCP)method.This method set the difference between the square of DC voltage reference and square of sampling DC voltage as the input variable of PI controller,meanwhile,the output of PI regulator is the power reference variable.The difference of the traditional method and the proposed method is described and contrasted.Finally,the proposed method was verified by experiment under the condition of grid voltage fluctuation.
作者
杜吉飞
赵红雁
郑琼林
孙湖
李丹勇
Du Jifei;Zhao Hongyan;Trillion Q.Zheng;Sun Hu;Li Danyong(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第9期2622-2629,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金青年科学基金项目(61603030)
