CAJ | 학술논문

为了提高电压跌落发生器在逆变侧模拟电网跌落故障时整流侧的响应速度，提出一种基于非线性控制的高性能控制策略。通过将引入的相对阶为2的能量函数与无功电流分量作为输出，在没有简化模型的基础上实现对三相脉宽调制(pulse width modulation，PWM)整流器这一欠驱动系统的完全精确反馈线性化，避免了系统的零动态响应。在能量函数的基础上增加一个反馈调节控制，提高控制系统抵抗模型参数不确定性时的鲁棒性。此外，针对电压跌落发生器(voltage sag generator，VSG)的逆变侧，根据三相电压矢量关系图，设计一种简单实现平衡跌落与部分不平衡跌落故障的开环控制器。仿真对比及实验结果表明，所提控制策略能够提高VSG 系统在电压跌落时的动态响应速度，保证直流母线电压的快速稳定调节，同时使网侧单位功率因数运行，具有显著的优越性。
위료제고전압질락발생기재역변측모의전망질락고장시정류측적향응속도，제출일충기우비선성공제적고성능공제책략。통과장인입적상대계위2적능량함수여무공전류분량작위수출，재몰유간화모형적기출상실현대삼상맥관조제(pulse width modulation，PWM)정류기저일흠구동계통적완전정학반궤선성화，피면료계통적령동태향응。재능량함수적기출상증가일개반궤조절공제，제고공제계통저항모형삼수불학정성시적로봉성。차외，침대전압질락발생기(voltage sag generator，VSG)적역변측，근거삼상전압시량관계도，설계일충간단실현평형질락여부분불평형질락고장적개배공제기。방진대비급실험결과표명，소제공제책략능구제고VSG 계통재전압질락시적동태향응속도，보증직류모선전압적쾌속은정조절，동시사망측단위공솔인수운행，구유현저적우월성。
To improve the response of the rectifier side when the inverter side of voltage sag generator (VSG) simulates that voltage sags, a novel high-performance control strategy based on nonlinear control was proposed. In the proposal an energy function which relative degree is two and reactive current component were considered as outputs. Then a full feedback linearization of the under-actuated three-phase pulse width modulation (PWM) rectifier was obtained without model simplifications, thus avoiding zero dynamics of the system. The feedback regulation based on the energy function was used to improve the robustness against model parameter uncertainties. In addition, a simple open loop controller which can realize balanced and partial unbalanced voltage sags was designed for the inverter side of VSG according to the vector relationship of three-phase voltages. Digital simulation and practical experimental results show that the proposed control strategy has good performance in improving dynamic response when the VSG system voltage sags, guaranteeing fast regulation and stability of dc-bus voltage and achieving unity power factor control for input AC voltage.