摘要
在电网难以涉及的偏远地区,居民生活及野外工程用电面临巨大挑战。针对上述问题,提出了一种由多端口变换器、光伏板及蓄电池组构成的交直流独立光储电源系统。多端口变换器包括输入端Boost升压变换器、储能端双向Buck-Boost变换器、交流输出端三相逆变器及直流输出端隔离式DC/DC变换器。输入端利用基于占空比扰动的控制策略实现光伏最大功率跟踪(Maximum power tracking,MPPT);隔离式DC/DC变换器利用电压闭环的单移相控制实现直流输出0~200 V;三相逆变器利用电压电流双闭环控制实现三相交流输出380 V/50 Hz。在储能端的控制策略中,将传统电压电流双闭环控制策略的电流内环改进为功率误差内环,实现对系统有功转移的直接控制。由仿真得出,系统在环境变化和负荷突变下均能实现稳定供电。同时,改进控制策略能有效降低光强突变下直流母线的电压波动幅值和暂态响应时间,在维持系统供电稳定性上更具优越性。
In remote areas where power grids are difficult to reach,electricity consumption for residents’lives and field projects faces enormous challenges.Aiming at these above problems,an AC/DC independent optical storage power supply system composed of multiport converter,photovoltaic panel and battery pack is proposed.The multi-port converter includes a Boost converter at the input terminal,a bidirectional Buck-Boost converter at the energy storage terminal,a three-phase inverter at the AC output terminal,and an isolated DC/DC converter at the DC output terminal.The input terminal uses a control strategy based on duty cycle disturbance to achieve photovoltaic maximum power tracking(MPPT);the isolated DC/DC converter uses voltage closed-loop single-phase shift control to achieve DC output of 0-200 V;the three-phase inverter uses voltage and current double closed-loop control to achieve three-phase AC output 380 V/50 Hz.In the control strategy of the energy storage end,the current inner loop of the traditional voltage and current double closed-loop control strategy is improved to the power error inner loop to realize the direct control of the active power transfer of the system.The simulation shows that the system can achieve stable power supply under both environmental changes and load abrupt changes.At the same time,the improved control strategy can effectively reduce the voltage fluctuation amplitude and transient response time of the DC bus under the sudden change of light intensity,which is more advantageous in maintaining the power supply stability of the system.
作者
熊力颖
何晓琼
韩鹏程
龚子
王卓然
XIONG Liying;HE Xiaoqiong;HAN Pengcheng;GONG Zi;WANG Zhuoran(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756;National Rail Transit Electrification and Automation Engineering Technology Research Center,Chengdu 611756)
出处
《电气工程学报》
CSCD
2022年第3期95-103,共9页
Journal of Electrical Engineering
关键词
改进控制策略
多端口变换器
光储电源系统
交直流输出
Improved control strategy
multi-port converter
optical storage power system
AC and DC output
