An improved power control strategy for grid-connected hybrid microgrid without park transformation and phase-locked loop system,International Transactions on Electrical Energy Systems

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An improved power control strategy for grid-connected hybrid microgrid without park transformation and phase-locked loop system
International Transactions on Electrical Energy Systems ( IF 1.9 ) Pub Date : 2021-05-02 , DOI: 10.1002/2050-7038.12922
Shameem Ahmad ₁ , Saad Mekhilef _{1,

2,

3} , Hazlie Mokhlis ₄

Affiliation

Voltage source converters are important elements of grid-connected microgrid, as these integrate distribution generators of microgrid with utility grid. Often due to lack of efficient and flexible control, these converters do not perform as per expectations. Many control methods based on dq current control theory had been developed for grid-connected microgrids inverters to control power flow between microgrid and grid. However, all these controllers used phase locked loop systems for grid synchronization purposes, which possess slow dynamics and transient response. To overcome these issues, in this article, an improved real and reactive power control method for grid-connected hybrid microgrid's bidirectional voltage source converter is proposed which is based on the dq current control theory without using phase locked loop system and Park transformation. The proposed power controller has possessed better dynamic performance compared with the conventional power controllers consisted of phase locked loop system. In addition, due to the elimination of phase locked loop system and park transformation not only the computational burden is reduced with the implementation of the proposed power controller, but also steady state performance is enhanced. The control hardware-in-loop real time simulation is carried out using real time digital simulator to validate the performance of the proposed power controller during transient state, steady state and power transfer mode by modeling a grid-connected hybrid microgrid. From the simulation results, it has been observed that the settling time has improved to 0.08 second compared to 0.15 second of conventional controller, power ripples are significantly reduced, and total harmonic distortion of converter output current obtained is 2.226%.

中文翻译：

一种改进的无园区改造和锁相环系统的并网混合微电网功率控制策略

电压源换流器是并网微电网的重要组成部分，因为它们将微电网的配电发电机与公用电网集成在一起。通常由于缺乏高效和灵活的控制，这些转换器不能按预期运行。许多基于dq电流控制理论的控制方法已被开发用于并网微电网逆变器来控制微电网与电网之间的潮流。然而，所有这些控制器都使用锁相环系统用于电网同步目的，这些系统具有缓慢的动态和瞬态响应。为了克服这些问题，本文提出了一种改进的并网混合微电网有功和无功功率控制方法。提出了一种基于dq电流控制理论的双向电压源换流器，不使用锁相环系统和Park变换。与由锁相环系统组成的传统功率控制器相比，所提出的功率控制器具有更好的动态性能。此外，由于锁相环系统和公园变换的消除，不仅随着所提出的功率控制器的实施减少了计算负担，而且提高了稳态性能。控制硬件在环实时仿真是使用实时数字仿真器进行的，通过对并网混合微电网建模来验证所提出的功率控制器在瞬态、稳态和功率传输模式下的性能。从模拟结果来看，

更新日期：2021-07-02

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