International Journal of Electrical and Electronics Research (IJEER) Open Access | Rapid and quality publishing Research Article | Volume 9, Issue 3 | Pages 16-26 | e-ISSN: 2347-470X 16 Website: www.ijeer.forexjournal.co.in Application of HFPSO-TOPSIS approach for optimally locating and sizing ░ ABSTRACT: Modern power system with renewables in distribution network has made the optimal sizing and location of reactive power support crucial and essential. By optimal locating and sizing of reactive power support resources causes a power loss reduction, improvement in voltage profile and maximizes techno-economic benefits to consumers and system operators while improving overall system performance and reliability. However, the optimal location of the reactive power supporting device (OLRPSD) and its sizing for voltage control ancillary service is a multi-objective problem requiring a multi-objective multi- criteria decision-making (MOMCDM) approach. In literature, objectives of reactive power supporting have been to minimize the power losses. But it has more than one objective that depends upon the reactive power supporting device. Moreover, the economic benefit from reactive power support also requires to be considered, which is of utmost importance for all stakeholders. In this paper, OLRPSD is performed considering financial benefit by an objective of reactive power cost minimization along with other targets like power loss reduction, maximization stability margin of voltage, and minimization of deviation of voltage with an application of a recently developed MOMCDM technique known as Hybrid Firefly Particle Swarm Optimization with TOPSIS approach (HFPSO-TOPSIS) and is therefore new. This is executed on “modified IEEE 33 bus” radial distribution network. Various reactive power compensating devices consi dered are Distributed generation (DG’s), Batteries, capacitors and D- STATCOM and Electric vehicle charging stations. The results show the merit of this method over the existing ones. Keywords: Hybrid Firefly Particle Swarm Optimization, TOPSIS, multi-objective, reactive power support, voltage control ancillary service. ░ 1. INTRODUCTION Modern restructured Power systems having distributed generation (DG’s) with bidirectional power flow has made it imperative to have reactive power support. This support is required in the form of reactive power reserves is essential for voltage control and stability of network. Compensation of Reactive power is one of the critical ancillary services essential to support the grid operations i.e. smooth delivery of power from generation to load. Smart Grid technology has enabled new technologies for providing reactive power support at transmission and distribution levels. India is not behind in reducing carbon emissions through renewable energy inclusion in generation mix and implementation of its smart grid road map. India is planning to have 100 smart cities and have made considerable investment in this direction. Similar to different countries of the world like Australia, Sweden, the U.K, U.S.A, Denmark, India has also made amendments in many regulations for including Renewables in Indian Electricity generation mix from the past few years. There are strategic plans to have 450 GW of electricity from renewable still 2030 [1]. All such circumstances have increased the need to maintain voltage at distribution level also in limits. In India, accordingly, there will be a rise in reactive power supporting the market by 2020. It has reached to about 20 million. This market sizing is done on three different bases [2] 1. Customer basis i.e. industries, utilities, railways, NTPC and big manufacturing industries [2]. 2. Type of load: slow varying loads such as servers, escalators, distribution transformers, fast changing loads like traction system, elevators and industrial loads, very fast changing loads like spot welding, arc furnaces, rolling mills etc. 3. Reactive power compensating devices: D-STATCOM, dynamic voltage restorer, DVR’s, fixed or variable Capacitors etc. Uncertainty of generation from renewable sources and irregular demand causes increase or decrease in power factor and therefore reactive power support becomes necessity. Any change in voltage level is controlled by efficient and effective use of reactive power compensating devices. By optimal location of reactive power supporting devices in the network, voltage stability is also enhanced.  The introduction should briefly place the study in a broad context and highlight why it is important. It should define the purpose of the work and its significance. The current state of the research field should be reviewed carefully and key publications cited. Please highlight controversial and diverging hypotheses when necessary. Finally, briefly mention Application of HFPSO-TOPSIS approach for optimally locating and sizing of reactive power compensating devices for voltage control ancillary service Kalyani Kurundkar 1 and Dr. G.A.Vaidya 2 1,2 PVG’s COET and GKP(W)IOM, India *Correspondence: Kalyani Kurundkar; Email : Kalyani.kurundkar@gmail.com ARTICLE INFORMATION Author(s): Prof. Kalyani Kurundkar, Dr. G.A.Vaidya Received: 22 Oct, 2021; Accepted: 04 Nov, 2021; Published: 17 Dec, 2021; e-ISSN: 2347-470X; Paper Id: IJEER-2021-07; Citation: doi.org/10.37391/IJEER.090301 Webpage-link: http://ijeer.forexjournal.co.in/archive/volume-9/ijeer-090301.html