CAJ | 학술논문

针对直流微电网的稳定性问题,采用状态空间法建立了直流微电网中多种变流装置及其控制系统的平均模型,并在此基础上对直流微电网进行了小扰动稳定性分析,得出了随着变流器控制参数变化的系统特征值轨迹.分析表明,当变流器的控制系数增大到一定数值时,将会出现实部为正的系统特征值,即系统不稳定.为了验证这一分析方法的可行性,又对所研究的直流微电网进行了时域仿真,得出负荷突增时不同控制系数下的时域电压曲线.仿真结果一方面验证了稳定性分析的结果,另一方面也表明,当控制系数在稳定范围内时,系数越大,则电压控制的效果也越好.由此可见,合理选择变流器的控制参数能够很好地保证直流微电网的电压稳定性.
침대직류미전망적은정성문제,채용상태공간법건립료직류미전망중다충변류장치급기공제계통적평균모형,병재차기출상대직류미전망진행료소우동은정성분석,득출료수착변류기공제삼수변화적계통특정치궤적.분석표명,당변류기적공제계수증대도일정수치시,장회출현실부위정적계통특정치,즉계통불은정.위료험증저일분석방법적가행성,우대소연구적직류미전망진행료시역방진,득출부하돌증시불동공제계수하적시역전압곡선.방진결과일방면험증료은정성분석적결과,령일방면야표명,당공제계수재은정범위내시,계수월대,칙전압공제적효과야월호.유차가견,합리선택변류기적공제삼수능구흔호지보증직류미전망적전압은정성.
The average models of various converters and their control systems are established by state-space approach,based on which the small disturbance stability of DC micro-grid is analyzed to obtain the loci of system eigenvslues versus converter control parameters.It shows that,when control parameter increases to a certain value,the real part of eigenvalue becomes positive,i.e.the system becomes instable.The time-domain simulation is carried out to obtain the voltage curves under different control parameters,which validates the practicability of proposed analysis method.It also shows that,within the stable range,the larger the control parameters are,the better the voltage control performance is.It is concluded that,the proper setting of converter control parameters ensures the voltage stability of DC micro-grid.