科研之友
微信
新浪微博
Facebook
分享链接
摘要
In parallel inverter system, the output power of the inverters cannot be proportional to the capacity of the inverters automatically due to the different connection line impedance. This paper presents a simple and accurate proportional load sharing method, which is based on improved P-V droop coefficient, to ensure proportional load sharing among the parallel inverters under different connection line impedance. Firstly, the key reason which results in disproportionate load sharing of parallel inverters is analyzed. Then, a method on injecting active power balance namely the improved P-V droop coefficient is presented, in which the presented method can be implemented by modifying the P-V droop coefficient, the presented method is based on the relation between the modified P-V droop coefficient and the connection line impedance, that is, for a set of unvaried connection line impedance in a limited load range, there must be a constant modified P-V droop coefficient to meet accurate proportional load sharing among the parallel inverters. Finally, the modified coefficient iterative algorithm is presented for the simple engineering application. The presented method can be implemented based on the measured connection line impedance or based on correcting P-V droop coefficient only once during inverters debugging or running under condition of high power factor load. The feasibility and superior performance of the presented method have been validated by experimental results.
- 出版日期2017-2
- 单位东北电力大学
