电源学报2024，Vol.22Issue(4)：112-120,9.DOI:10.13234/j.issn.2095-2805.2024.4.112
锁相同步并网变换器电流控制内电势幅值/频率形成机制分析
Analysis of Formation Mechanism of Internal Voltage Amplitude/Frequency in Current Control of Phase-locked Synchronous Grid-connected Converter
摘要
Abstract
In the traditional power system,the synchronous generator independently forms the internal voltage amplitude/frequency,which is connected to grid to establish the system voltage.However,the establishment of grid voltage at present is increasingly dependent on renewable energy equipment.Under the phase-locked synchronization,the grid-connected converter needs to detect the grid voltage to form the internal voltage,which seems to be different from the synchronous machine that independently forms the internal voltage and further establishes the system voltage.On this basis,the mechanism of internal voltage amplitude/frequency formed by the current control of the phase-locked synchronous converter is studied,and it is explicitly stated that the internal voltage amplitude/frequency is uniquely determined by current,which is essentially the same as the synchronous generator independently forming the internal voltage to establish the system voltage.In this paper,based on the control structure and the nature of forming the AC instantaneous value,it is explained that the converter output is essentially the internal voltage amplitude/frequency.Then,starting from the closed-loop dynamic process of equipment and network,the redundant relationship between terminal voltage and current is clarified.After the input current is determined,the internal voltage amplitude/frequency can be uniquely determined accordingly.Finally,combined with the simulation analysis,the correctness of uniquely determining the internal voltage amplitude/frequency by input current is demonstrated.关键词
并网变换器/电流控制/内电势幅值/频率/形成机制Key words
Grid-connected converter/current control/internal voltage amplitude/frequency/formation mechanism分类
信息技术与安全科学引用本文复制引用
洪宇,袁小明,龚轩..锁相同步并网变换器电流控制内电势幅值/频率形成机制分析[J].电源学报,2024,22(4):112-120,9.基金项目
国家自然科学基金智能电网联合基金资助项目(U1866601)This work is supported by Smart Grid Joint Fund of National Natural Science Foundation of China under the grant U1866601 （U1866601）
