Impact of P - Q Control based PV Generator on Memory-Polarized Mho Relay

Radhakrishnan, A and Priyamvada, IRS and Das, S (2022) Impact of P - Q Control based PV Generator on Memory-Polarized Mho Relay. In: 5th International Conference on Smart Energy Systems and Technologies, SEST 2022, 5 - 7 September 2022, Eindhoven.

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Abstract

This paper presents novel findings on the performance of positive sequence memory-polarized (PSMP) mho distance element influenced by the converter controls of photovoltaic (PV) generators. PSMP mho relays are used for distance protection of transmission lines. Positive sequence memory polarization is employed to ensure dependable operation during close-in faults. For the PSMP mho elements located on transmission lines energized by synchronous generators (SGs), the memory polarized mho elements experience an expansion of characteristics. This dynamic expansion enhances the resistive coverage of the characteristics, thus improving its dependability. In PV generators, the converter controls determine the magnitudes and angles of fault signals. This paper presents the impact of P-Q control of grid-following PV generators on the dynamic and steady-state behaviour of the PSMP mho characteristics. The has been analyzed with respect to the fault signals governed has been analyzed with respect to the fault signals governed by the P-Q control strategy. Modified IEEE-39 bus system with additional PV generators is simulated in PSCAD software for performance evaluations. Various Zone-1 forward faults and Zone-3 reverse faults have been studied to analyze the dynamic PSMP mho performance. It is observed that for the lines emanating from PV generators, the PSMP mho characteristics lose their resistive reach considerably for both forward and reverse faults. As a result, the dependability of the PSMP mho element also explained in terms of the P-Q control actions during fault.

Item Type:	Conference Paper
Publication:	SEST 2022 - 5th International Conference on Smart Energy Systems and Technologies
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Electric equipment protection; Electric fault currents; Electric power system protection; Electric relays; Expansion; Polarization; Power converters, Distance relay; Dynamic mho expansion; Fault signal; Memory polarization; P - Q control; Performance; Photovoltaic generator; Photovoltaics; Q-control; Sequence memory, Electric lines
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	17 Nov 2022 05:14
Last Modified:	17 Nov 2022 05:14
URI:	https://eprints.iisc.ac.in/id/eprint/77918

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