Improved Dead-Beat Predictive DPC Strategy of Grid-Connected DC–AC Converters With Switching Loss Minimization and Delay Compensations
Improved Dead-Beat Predictive DPC Strategy of Grid-Connected DC–AC Converters With Switching Loss Minimization and Delay Compensations
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DOI：
10.1109/tii.2012.2223705
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发表时间：
2013-05
影响因子：
12.3
通讯作者：
Jiabing Hu
中科院分区：
文献类型：
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作者：
Jiabing Hu
提出了一种改进的无差拍预测直接功率控制（DPC）策略用于并网DC-AC变换器。为了最小化开关损耗和减轻功率振荡，提出了一种新的电压矢量的序列的预测DPC策略的基础上所需的转换器电压矢量的角位置，而不是电网电压矢量。因此，交流电流中的低次谐波和无功功率中的周期性振荡被去除，保持最小的开关损耗的特征。此外，为了减少有功和无功功率的稳态误差，在实际系统中提出了补偿方法，用于补偿由采样延迟引起的功率误差和角位移。在一台1.5 kW并网型DC-AC变换器上的实验结果验证了所提出的预测DPC电压矢量序列和补偿方法的可行性。
This paper presents an improved dead-beat predictive direct power control (DPC) strategy for grid-connected dc-ac converters. In order to minimize switching losses and to alleviate power oscillations, a new voltage vectors' sequence is proposed for the predictive DPC strategy based on the angular location of the required converter voltage vector rather than the grid voltage vector. Thus, low-order harmonics in ac currents and periodic oscillations in the reactive power are removed with the feature of minimum switching losses kept. Further, in order to reduce steady-state errors of active and reactive powers, compensation methods are proposed in practical systems for both power errors and angular shifts caused by sampling delays. Experimental results on a 1.5 kW grid-connected dc-ac converter are provided to validate the feasibility of the proposed voltage vectors' sequence and compensation methods for the predictive DPC strategy.