摘要
直流配电在方便可再生能源接入的同时可以减少变流环节,提高用电效率,并且不会引起频率不稳定及无功功率不平衡等问题。直流变换器作为直流微网中的电能馈送的重要一环,其控制策略的优劣显得尤为突出。提出了一种负荷用直流变换器的虚拟直流发电机控制方法,该控制策略继承了旋转电机的惯性特性,当带载变化时,这种控制策略能够缓和恢复受扰动的负荷侧电压,且维持直流微网负荷端电压在其额定值。建立的DC/DC小信号模型证明了采用虚拟直流发电机控制的直流变换器在直流母线电压波动过程中的功率响应与其阻尼参数成反比,因此可根据母线电压变化趋势自动调节对母线功率的吸收,响应母线电压波动,支持母线电压恢复。仿真及实验结果验证了所提出控制策略的可行性和正确性。
DC distribution can reduce the converter link, improve power efficiency and make renewable energy ac-cess convenient.In addition, with DC distribution there is no need to consider the stability of frequency, reactive power and other issues.As a micro-grid power feed part, DC/DC converter’ s control method is particularly impor-tant.A control method of DC generator that is suitable for the DC/DC converter has been connected to energy stor-age and a load has been proposed which inherits inertia characteristics of rotation motor.This strategy is used to e-liminate the effects of the load’ s output and restore disturbed load side voltage softly while the device is put in or cut off from the bus.DC/DC small-signal model has been established, proving that the power response of DC/DC converter controlled by virtual DC generator strategy in DC bus voltage fluctuation process is inversely proportional to its damping parameters.Therefore the absorption of the bus power can be adjusted automatically according to the change of the bus voltage, respond to the fluctuations of the bus voltage and support the recovery of bus voltage. Simulation and experimental results verify the feasibility and correctness of the proposed control strategy.
出处
《电力科学与工程》
2015年第4期32-36,42,共6页
Electric Power Science and Engineering
作者简介
黄頔（1990-），女，硕士研究生，研究方向为分布式发电与电力电子在微电网中的应用，E—mail：heatherhdfb@163．com。
