光伏级联DC/DC变换器模式切换稳定性分析及降压运行策略

doi:10.3969/j.issn.1000-7229.2020.01.012

电力建设 ›› 2020, Vol. 41 ›› Issue (1): 97-105.doi: 10.3969/j.issn.1000-7229.2020.01.012

光伏级联DC/DC变换器模式切换稳定性分析及降压运行策略

田艳军，陈映妃，王慧，王毅，高皓楠

新能源电力系统国家重点实验室（华北电力大学），河北省保定市，071003

出版日期:2020-01-01
作者简介:田艳军(1986)，男，博士，讲师，主要研究方向为新能源发电、变流器阻抗匹配特性控制；陈映妃(1995)，女，硕士研究生，主要研究方向为新能源发电、变流器阻抗匹配特性控制；王慧(1982)，男，工程师，博士研究生，通信作者，主要研究方向为风力发电控制技术、电力电子在电力系统中的应用；王毅(1977)，男，博士后，教授，主要研究方向为电力电子技术在电力系统中的应用；高皓楠(1995)，男，硕士研究生，主要研究方向为电力电子技术在电力系统中的应用。
基金资助:
国家重点研发计划资助(2018YFB0904104)；中央高校基本科研业务费专项资金资助(2017MS098)

Mode Switching Stability Analysis and Step-down Operation Strategy of Photovoltaic Cascaded DC/DC Converters

TIAN Yanjun,CHEN Yingfei, WANG Hui, WANG Yi, GAO Haonan

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources（North China Electric Power University）, Baoding 071003, Hebei Province, China

Online:2020-01-01
Supported by:
This work is supported by National Key Research and Development Program of China(No. 2018YFB0904104) and the Fundamental Research Funds for the Central Universities(No. 2017MS098).

摘要/Abstract

摘要： 在光伏直流升压汇集系统中，光伏侧DC/DC变换器通过级联拓扑可实现光伏功率升压直流送出。当光伏输入侧功率差异较大时，级联变换器会在最大功率点跟踪模式和定电压模式间切换，模式切换控制会引起系统稳定性变化。文章以级联隔离升压全桥变换器为研究对象，建立变换器在电导增量法-最大功率点跟踪控制、定电压控制下的小信号输出阻抗模型和级联系统等效阻抗模型，根据阻抗稳定性判据评估控制模式切换下系统稳定性差异。当变换器由最大功率点跟踪模式切换为定电压模式时会降低系统稳定性能，且随着切换控制模式模块数量的增多稳定性显著减小。在此情况下，可采用母线电压降压运行的方案，尽可能使光伏侧DC/DC变换器工作在最大功率点跟踪模式，以维持系统的稳定性。在Matlab/Simulink中搭建级联系统仿真模型，验证了理论分析的正确性。

关键词: 隔离升压全桥变换器, 多模式控制, 小信号建模, 等效阻抗模型, 稳定性分析

Abstract: In the photovoltaic DC boost collection system, DC/DC converters on the photovoltaic side realize power transmission through the cascaded topology. However, when the input photovoltaic power is different greatly, the cascaded converter switches between the maximum power point tracking (MPPT) mode and the constant voltage mode, and the mode switching control causes the system stability change. In this paper, the isolated boosting full-bridge converter is taken as the research object, and the small-signal model of the converter output impedance under the control of incremental conductivity method-MPPT and constant voltage is established, and then the equivalent impedance model of cascaded system is deduced. According to the impedance stability criterion, the difference of system stability under control mode switching is evaluated. The results show that the stability of the system is reduced when the converter is switched from the MPPT mode to the constant voltage mode, and the stability is significantly deteriorated as the number of switching control mode modules increases. Therefore this paper proposes to decrease the bus voltage to maintain PV-side DC/DC converter within the MPPT control mode. Finally, a simulation model of the cascaded system is built in Matlab/Simulink to verify the correctness of the theoretical analysis.

Key words: isolated boosting full-bridge converter, multi-mode control, small signal modeling, equivalent impedance model, stability analysis

中图分类号:

TM 615

田艳军，陈映妃，王慧，王毅，高皓楠. 光伏级联DC/DC变换器模式切换稳定性分析及降压运行策略[J]. 电力建设, 2020, 41(1): 97-105.

TIAN Yanjun,CHEN Yingfei, WANG Hui, WANG Yi, GAO Haonan. Mode Switching Stability Analysis and Step-down Operation Strategy of Photovoltaic Cascaded DC/DC Converters[J]. Electric Power Construction, 2020, 41(1): 97-105.

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光伏级联DC/DC变换器模式切换稳定性分析及降压运行策略

Mode Switching Stability Analysis and Step-down Operation Strategy of Photovoltaic Cascaded DC/DC Converters

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