Evaluation of the 1186 MW coal-fired power plant tripping incident using the Automatic Load Dropping (ALD) system protection scheme of NGCP

Date

7-2016

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Power Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

John Paul P. Manzano

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

When a generator unit of a power plant trips the power system is suddenly thrown out of balance causing a major drop in the system frequency which might cause damage to other plants and equipment. In order to address this problem, the National Grid Corporation of the Philippines (NGCP) adopted the Automatic Load Dropping (ALD) system protection scheme. This study aims to analyze and evaluate the 1186 MW generation using the ALD system protection scheme. During the disturbance last MArch 13, 2015, the frequency dropped to 58.41 Hz which trigerred the protection scheme. Volatge level were checked and it was determined tha 500 kV bus voltages rose and breached its 525 kV limit. The ALD scheme activates the underfrequency relays, contingency reserves and the reactive power support services. NGCP and MERALCO dropped 244.12 MW and 739.94 MW of their loads, respectively. To fully cover the generation loss, the protection scheme provided 450.5 MW through its contingency reserves. As part of the reactive power support services, power plants lowered the reactive power being supplied to grid to maintain the bus voltage in its acceptable range. The ALD system protection scheme covered a total of 1434.56 MW which was more than enough to cover the 1186 MW generation loss during the disturbance.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993 2016 E64 L65

Document Type

Thesis

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