Abstract
This paper investigates the mechanism analysis and the experimental validation of employing superconducting magnetic energy storage (SMES) to enhance power system stability. The models of the SMES device and the single-machine infinite-bus (SMIB) system with SMES are deduced. Based on the model of the SMIB system with SMES, the action mechanism of SMES on a generator is analyzed. The analysis takes the impact of SMES location and the system operating point into consideration, as well. Based on the mechanism analysis, the P-controller and Q-controller are designed utilizing the phase compensation method to improve the damping of the SMIB system. The influence of factors, such as SMES location, transmission system reactance, the dynamic characteristics of SMES and the system operating point, on the damping improvement of SMES, is investigated through root locus analysis. The simulation results of the SMIB test system verify the analysis conclusions and controller design method. The laboratory results of the 150-kJ/100-kW high-temperature SMES (HT-SMES) device validate that the SMES device can effectively enhance the damping, as well as the transient stability of the power system.
Highlights
The interconnection of regional power systems and the integration of renewable energy generation make the stability of a large-scale power system increasingly important and challenging [1].To enhance power system stability, various types of controllers are employed for power systems, such as power system stabilizers (PSSs) and supplementary damping controllers of the flexible AC transmission system (FACTS) devices
A superconducting magnetic energy storage (SMES) device mainly consists of two parts: a power conditioning system (PCS) used for power commutation control and a superconductive magnet used for energy storage
To validate the theoretical analysis of the mechanism and the effectiveness of the proposed controllers for SMES, simulation analysis of the single-machine infinite-bus (SMIB) system depicted in Figure 3 is carried out by using PSCAD/EMTDC software (Manitoba HVDC Research Centre, Manitoba, Canada)
Summary
The interconnection of regional power systems and the integration of renewable energy generation make the stability of a large-scale power system increasingly important and challenging [1]. The work in [12] represents the SMES by the phase and magnitude variation of the voltage of the bus where the SMES device is installed. Various control techniques are utilized to design the SMES controllers, which generate orders for the power conditioning system (PCS) of the SMES device. The conventional proportional (P) controller and proportional-integral (PI) controller are adopted for the SMES device in several experimental projects described in [8,13] These references mainly focus on the experimental results and give few details about the controller design. Both simulation and the laboratory experiment results verify the analysis conclusions and the effectiveness of employing SMES to enhance power system stability.
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