Hardware-in-the-Loop Testing of Dynamic Grid Voltages for Static Var Compensator Controllers With Single-Phase Induction Motor Loads

Bikrant Poudel,Rastin Rastgoufard,Jayanth R Ramamurthy,Ittiphong Leevongwat,Thomas E Field,Ebrahim Amiri,Parviz Rastgoufard

doi:10.1109/oajpe.2020.3013803

Bikrant Poudel, Rastin Rastgoufard + Show 5 more

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https://doi.org/10.1109/oajpe.2020.3013803

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This paper investigates the interaction between two Static var Compensators (SVCs) to verify dynamic grid voltage support is maintained and that the SVC controllers do not negatively interact with each other. For this purpose, the controls of the SVCs with all of the remotely controlled Mechanically-Switched Capacitors (MSCs) have been tested in a closed-loop real-time simulator environment using SVC replicas (physical controllers) of the actual field installations. To accurately capture the power system’s response to phenomenon such as potential Fault Induced Delayed Voltage Recovery (FIDVR), the dynamics of the generators and the motor loads are modeled in the simulations. A hybrid model consisting of real and reactive power (P-Q) loads and aggregated motor load of a single-phase induction motor suitable for three-phase time-domain simulation was developed and connected to the power system. The developed aggregate motor load model includes details such as the main winding, auxiliary winding, starting capacitor, motor inertia, and distribution transformers. It is observed that dynamic grid voltage support can be maintained and the SVC controllers do not negatively interact with each other if all the SVC control blocks are enabled and function normally.

Highlights

S TATIC var Compensators (SVCs) represent a matured class of Flexible AC Transmission System (FACTS) technology and is widely used in power systems for dynamic var support [1]–[4]
Simulation results have clearly highlighted the importance of modeling load dynamics, which is often ignored during factory testing of SVC controllers
It is concluded that when the fault is initiated, induction motor loads initially provide some minimal voltage support to the network owing to the back-emf, they cause a prolonged voltage recovery due to the re-acceleration of the motor loads

Summary

Introduction

S TATIC var Compensators (SVCs) represent a matured class of Flexible AC Transmission System (FACTS) technology and is widely used in power systems for dynamic var support [1]–[4]. In [24], the aggregate EC model of single-phase induction motors was developed by the authors using no-load and locked rotor test data, but it does not include distribution transformers.

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