A New Variable-Frequency Optimal Direct Power Control Algorithm
A New Variable-Frequency Optimal Direct Power Control Algorithm
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DOI：
10.1109/tie.2011.2167732
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发表时间：
2013-04
影响因子：
7.7
通讯作者：
J. Alonso-Martínez;J. Carrasco;D. Santos-Martín;S. Arnaltes
中科院分区：
文献类型：
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作者：
J. Alonso-Martínez;J. Carrasco;D. Santos-Martín;S. Arnaltes
本文提出了一种新的直接功率控制（DPC）公式，对以前的DPC公式进行了几项改进，例如给定逆变器开关状态产生的预测功率变化的精确离散时间表达式以及在模型中包含计算延迟时间。在此基础上，提出了一种变频最优DPC算法，该算法选择使功率误差最小的逆变器开关状态。该算法在估计功率变化方面显示出优异的精度，因此减少了功率涟漪和不需要的电流谐波，同时保留了可变频率DPC固有的快速动态特性。这使得该算法适用于分布式发电与微电网的接口，其中需要快速准确的功率控制以执行电压和频率调节。此外，研究了平均开关频率和模型参数对算法鲁棒性的影响。
This paper presents a new formulation for direct power control (DPC) with several improvements over previous DPC formulations such as an exact discrete-time expression for the predicted power variations yielded by a given inverter switching state and the inclusion of the computing delay time in the model. Based on this formulation, a variable-frequency optimal DPC algorithm is presented that selects the inverter switching state that minimizes the power error. This algorithm shows an excellent precision in estimating power variations, therefore reducing power ripple and unwanted current harmonics, while retaining the fast dynamics inherent to variable-frequency DPC. This makes this algorithm suitable for interfacing distributed generation to microgrids, where a fast and accurate power control is desirable in order to perform voltage and frequency regulation. Additionally, studies are carried out regarding the average switching frequency and the influence of the model parameters on the algorithm robustness.