Design and Analysis on an Optimized Interface Algorithm for Real-Time Integrated Simulation System of Renewable Energy and the Power Grid

Yanfeng Meng,Li Ji,Honghua Xu,Shuju Hu

doi:10.3390/en13174380

Abstract

The interface algorithm is critical for accuracy of the real-time integration simulation system of renewable energy and the power grid. To improve the overall performance of the existing interface algorithms, this paper proposes an optimized interface algorithm based on the auxiliary damping impedance method interface current feedback. We explain in detail the implementation principle of the new interface algorithm and the calculation method of impedance matching and also provide a parallel timing control logic. Using the new interface algorithm, we derive equations for voltage and current of the digital simulation system side and the device under test side and also compare it with the naturally coupled system without interface delay. Finally, we verify the accuracy of the new interface algorithm via establishing a complete model of the real-time integration simulation system with a wind turbine and the power grid. The results show that the accuracy can be improved 95% in the digital simulation system side and 17% in the device under test side by using the proposed interface algorithm in this paper.

Highlights

With the large-scale development of renewable energy, such as wind power and photovoltaic power generation, the reliability and stability of the integration with renewable energy and the power grid is becoming more and more important [1,2]
We studied a key technology of the real-time integration simulation to realize reliable grid-connected testing of high-power renewable energy
Aiming at the problems of the current common power hardware-in-the-loop (PHIL) real-time simulation system IAs, we proposed an optimized new IA based on the auxiliary DIM interface current feedback, which has the advantages of both DIM and ideal transformer model (ITM) interface algorithms

Summary

Introduction

With the large-scale development of renewable energy, such as wind power and photovoltaic power generation, the reliability and stability of the integration with renewable energy and the power grid is becoming more and more important [1,2]. Considering fluctuation of the renewable energy, the real-time reliability of renewable energy power-generation units must be fully tested and verified on the ground before being connected to the real power grid. The traditional grid simulator is mainly based on the power electronic converter, which can only simulate some specific grid faults such as high- and low-voltage faults, harmonics and frequency changes, and so on [3]. It cannot simulate real-timely actual grid characteristics and the interactive characteristics of the renewable energy and the power grid. Real-time integrated simulation system (RTISS) with renewable energy and the power grid based on power hardware-in-the-loop (PHIL)

Methods

Findings

Discussion

Conclusion