CAJ | 학술논문

为提高逆变器的P-f和Q-V下垂控制在中、低压网络中的适用性，提出了虚拟电感与外接输出电感的联合控制方式。设计了一种新型逆变器多环控制策略，推导其状态空间方程，建立完整的小信号模型，并依据此提出了虚拟电感与外接输出电感参数选取的“配比原则”。应用该原则可有效降低二者取值，克服了单独使用虚拟阻抗控制对系统稳定性的影响和过大外接输出电感带来的功率损耗问题。在线性和非线性负载两种工况下仿真分析，表明所提出的控制策略和依据“配比原则”所选取的参数不仅提高了逆变器的输出感抗，降低线路参数对下垂控制的干扰，而且精确微网电源间功率分配，有效抑制环流。本文为传统下垂控制在中、低压网络中应用提供了依据。
위제고역변기적P-f화Q-V하수공제재중、저압망락중적괄용성，제출료허의전감여외접수출전감적연합공제방식。설계료일충신형역변기다배공제책략，추도기상태공간방정，건립완정적소신호모형，병의거차제출료허의전감여외접수출전감삼수선취적“배비원칙”。응용해원칙가유효강저이자취치，극복료단독사용허의조항공제대계통은정성적영향화과대외접수출전감대래적공솔손모문제。재선성화비선성부재량충공황하방진분석，표명소제출적공제책략화의거“배비원칙”소선취적삼수불부제고료역변기적수출감항，강저선로삼수대하수공제적간우，이차정학미망전원간공솔분배，유효억제배류。본문위전통하수공제재중、저압망락중응용제공료의거。
To improve the applicability of conventional P-f and Q-V droop control methods of inverters in middle-voltage and low-voltage microgrids, this paper puts forward a novel control method of using virtual inductance and artificial output inductance in combination. A multiple feedback loop control strategy is proposed, the state-space equations are derived, and a complete small-signal model is established. Based on this, the matching principle of choosing virtual inductance and artificial output inductance is proposed. The inductance value is reduced significantly according to this principle, so problems of system stability and power loss are overcome. Simulation and analysis under linear and nonlinear load show that the proposed control strategy and parameter selecting method can not only enhance the output inductance of inverters, thus reduce the interference by line parameters, and also provide accurate load sharing, and inhibit circulating current effectively. This paper provides a new strategy for using conventional droop control in middle-voltage and low-voltage network.