Improvements in Existing System Integrity Protection Schemes Under Stressed Conditions by Synchrophasor Technology—Case Studies

Makarand Sudhakar Ballal,Amit Ramchandra Kulkarni

doi:10.1109/access.2021.3054792

Abstract

In this modern era, the power system is stigmatized by a conglomeration of ultra-high voltage AC and DC, multi-terminal DC, and extra-high voltage AC transmission networks. It consists of a large distribution network beyond the country along with traditional generation having Ultra Mega Power Plants (UMPP) and growing ingress of Renewable Energy Sources (RES). The System Integrity and Protection Schemes (SIPS) play a crucial role in preserving a secure and reliable grid and facilitate efficient grid control during severe power system contingencies. In this paper, the operational experiences of three important SIPS in India are presented. Based on a thorough analysis, the drawbacks of these SIPS are identified and an algorithm is proposed to overcome the drawbacks using synchrophasor technology. The performance and capability of the proposed algorithm are evaluated by simulation studies on the 39-bus New England system embedded with HVDC link in MATLAB. Simulation results consummated confirm the effectiveness of the scheme in preserving system integrity. Results are validated using Electrical Transient Analyzer Program (ETAP), which is a very powerful design and analysis tool and has an extremely user-friendly interface.

Highlights

System integrity protection schemes (SIPS) are special protection schemes that can operate under stressed conditions and prevent blackout of vulnerable parts of an electrical power system
This paper presents the operational evaluation of three existing SIPS in the western and northern regions of India
CASE STUDIES Responses of three SIPS discussed in the above section are meticulously tested on the IEEE 39-bus New England system embedded with HVDC link

Summary

INTRODUCTION

System integrity protection schemes (SIPS) are special protection schemes that can operate under stressed conditions and prevent blackout of vulnerable parts of an electrical power system. Article [26] provides an outline of the structure and utilization of widearea monitoring, protection, and control (WAMPAC) system This serves as SIPS to monitor, protect, and control transmission power during normal and abnormal operating conditions. Support by synchrophasor measurement to SIPS for the exclusive high-end protection of the smart power grid is given in [29] It extricates synchronized voltage and current phasor data from all phasor measurement units. It is used to identify the disturbance, detect the disturbed area, and locates the responsive region and improves the situation awareness In this SIPS, the appropriate actions such as generation or load adjustment or controlling under voltage or over voltage relay operation are not demonstrated. The proposed algorithm when incorporated with the existing SIPS delivers many advantages It is adaptive for any SIPS and its operation is based on only PMU data.

MOTIVATION

CASE STUDIES

Findings

CONCLUSION