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传统最大功率跟踪(MPPT)方法如电导增量法存在较大稳态误差和波动,加入模糊控制后,虽然系统的动态性能有所改进,但由于模糊论域固定,控制还是略微粗糙,稳态时存在波动。文章采用变论域模糊控制对MPPT进行控制,其优点是不需要过多经验来设定规则表,通过输入改变伸缩因子从而改变论域的范围,使控制更加灵活,缩短了响应时间,缩小了稳态误差和波动,从而保护光伏负载,极大提高太阳光利用率。分别在固定环境和变化环境中对系统进行仿真,从输出功率和负载电压两方面对变论域模糊控制的优越性进行论证。
The traditional maximum power tracking (MPPT) method such as the conductance incremental method has large steady-state errors and fluctuations. After adding the fuzzy control, although the dynamic performance of the system has been improved, the control is still slightly rough due to the fixed fuzzy domain, There are fluctuations. The article uses variable universe fuzzy control to control MPPT. The advantage of this method is that it does not need too much experience to set the rules table. By changing the scaling factor, the scope of the universe of discourse can be changed, which makes the control more flexible, shortens the response time and reduces Steady-state error and fluctuations, thus protecting the photovoltaic load, greatly improve the utilization of sunlight. The simulation of the system in a fixed environment and a changing environment respectively demonstrates the superiority of the variable domain fuzzy control from the output power and the load voltage.