Design of controlled system separation scheme and frequency control arrangement for an islanding operation of Bhutan Grid

Name: Ngawang Norbu.

keyword: Automatic generation control (AGC)

LCSH: Automatic control.

; Cumulative moving average of df/dt (CMAdf/dt)

LCSH: Electric power production -- Bhutan

; Frequency response characteristic (FRC)

; Governor control.

; Phasor measurement unit (PMU)

; Special protection scheme (SPS)

; Bhutan power system

Abstract: Bhutan power system is connected to Indian grid through multiple transmission lines at various voltage levels. As it is connected through alternating current (AC) system, any grid disturbance in Indian side directly affects the Bhutan system. Thus, this research work attempts to address this persistent problem by developing an appropriate system separation scheme and frequency control arrangement for Bhutan power grid. In recent years, phasor measurement units (PMU) have been installed at various strategic locations in Bhutan power system and this high resolution, time synchronized PMU data can be designed to monitor, detect disturbance and isolate the Bhutan power system to prevent blackouts. Since there is no complete power system dynamic model of Bhutan grid, one of the important endeavors is to develop dynamic model in PowerWorld simulator with an actual dynamic data from Bhutan system. It also needs to develop equivalent dynamic model of Indian grid using latest frequency response characteristic (FRC). The dynamic model is then validated using 2012 Indian grid blackout case. Eventually, the model is used to conduct various simulations to understand the dynamic behavior of the power system. Also, for an islanded Bhutan system, frequency response sensitivity analyses were carried out with various frequency control measures like governor control, automatic generation control as well as generator tripping and load shedding for emergency control. One of the most important outcomes of this research is designing of system separation scheme and frequency control arrangement. After thorough review of various system separation methods and examining it under various possible disturbances, it was resolved that the combination of frequency and cumulative moving average of df/dt (CMAdf/dt) can be one of the best methods to monitor and detect the grid disturbances to initiate system separation. Additionally, the generator tripping and load shedding scheme based on tie-lines breaker status is also developed to control the Bhutan grid frequency immediately after the system separation. Finally, from the multiple dynamic simulation results under various power system conditions (different disturbance conditions) indicates that the proposed system separation scheme and frequency control arrangement can be executed successfully to prevent blackouts. Thus, this scheme may be considered for practical implementation in future after further validations from real time PMU data.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Name: Wijarn Wangdee

Role: Thesis Advisors.

Email : wijarn.w.epe@tggs-bangkok.org

Created: 2018

Modified: 2020-10-02

Issued: 2020-09-16

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Electrical Power and Energy Engineering (International Program)

Grantor: King Mongkut's University of Technology North Bangkok

©copyrights King Mongkut's University of Technology North Bangkok

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