Design of Decentralized Biased Controllers for Load-Frequency Control of Interconnected Power Systems

Chidambaram, I. A.; Velusami, S.

doi:10.1080/15325000590964047

Cited by 36 publications

(35 citation statements)

References 12 publications

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“…Any mismatch between actual and contracted demands will result in frequency deviations that will drive LFC to re dispatch the GENCOs according to ACE participation factors, i.e., apf 11, apf 12, apf 21 and apf 22 . The state space representation of the minimum realization model of ' N ' area interconnected power system may be expressed as [16].…”

Section: Fig 1 Schematic Diagram Of Two-area System In Restructuredmentioning

confidence: 99%

Ancillary Service Requirement Assessment Indices for the Load Frequency Control in a Restructured Power System with Redox Flow Batteries

Chandrasekar¹,

Paramasivam²,

Chidambaram³

2016

Journal of Electrical Engineering and Technology

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-This paper proposes various design procedures for computing Power System Ancillary Service Requirement Assessment Indices (PSASRAI) for a Two-Area Thermal Reheat Interconnected Power System (TATRIPS) in a restructured environment. In an interconnected power system, a sudden load perturbation in any area causes the deviation of frequencies of all the areas and also in the tie-line powers. This has to be corrected to ensure the generation and distribution of electric power companies to ensure good quality. A simple Proportional and Integral (PI) controllers have wide usages in controlling the Load Frequency Control (LFC) problems. So the design of the PI controller gains for the restructured power system are obtained using Bacterial Foraging Optimization (BFO) algorithm. From the simulation results, the PSASRAI are calculated based on the settling time and peak over shoot concept of control input deviations of each area for different possible transactions. These Indices are useful for system operator to prepare the power system restoration plans. Moreover, the LFC loop coordinated with Redox Flow Batteries (RFB) has greatly improved the dynamic response and it reduces the control input requirements and to ensure improved PSASRAI, thereby improving the system reliability.

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Section: Fig 1 Schematic Diagram Of Two-area System In Restructuredmentioning

confidence: 99%

Ancillary Service Requirement Assessment Indices for the Load Frequency Control in a Restructured Power System with Redox Flow Batteries

Chandrasekar¹,

Paramasivam²,

Chidambaram³

2016

Journal of Electrical Engineering and Technology

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“…The stability index to be minimized is (5) The stability index η to be minimized can be written as (6) Where P is a symmetric positive definite matrix obtained from the solution of (7) where Q is a positive semi-definite matrix and Aˆi s augmented system matrix. The weighting matrix Q is .The weight coefficients corresponding to the output variables are specified to relatively larger values in order to prevent the excessive control action when GRC is taken into account.…”

Section: Design Of Decentralized Controller Using Msm Criterionmentioning

confidence: 99%

“…Therefore, a new controller design needs to be developed based on a compromise between the ISE design criterion and MSM design criterion in order to obtain satisfactory closed loop system performance and stability [5].…”

Section: Design Of Proposed Decentralized Controllermentioning

confidence: 99%

“…Hence, to obtain the decentralized controllers with improved stability margin, they are designed on the basis of Maximum Stability Margin (MSM) criterion using Lyapunov method. However, Controllers designed on the basis of MSM criterion do not posses the inherent good properties of the controller designed on the basis of ISE criterion except for improvement in stability [5]. Therefore, it is expected that an appropriate multi-objective control strategy will be able to give a better solution for this problem.…”

Section: Introductionmentioning

confidence: 99%

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MOEA based Design of Decentralized Load-Frequency Controllers for Interconnected Power Systems with AC-DC Parallel Tie-lines and Considering Nonlinearities

Ganapathy¹,

Velusami²

2010

IJCA

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A new approach to the design of decentralised controllers, using Multi-Objective Evolutionary Algorithm (MOEA), for loadfrequency control of interconnected power systems with AC-DC parallel tie-lines and considering Governor Dead Band and Generation Rate Constraint nonlinearities, is proposed in this paper. The HVDC link is used as system interconnection in parallel with AC tie-line to effectively damp the frequency oscillations of AC system. The proposed controller satisfies two main objectives, namely, minimum Integral Squared Error of the system output and maximum closed loop stability of the system. Simulation studies are conducted on a two area interconnected power system with AC-DC parallel tie lines and considering nonlinearities. Results indicate that the proposed controller gives good dynamic responses and can guarantee the stability of the overall system in the presence of system nonlinearities and parameter changes.

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“…Hence, to obtain the decentralized controllers with improved stability margin, they are designed on the basis of Maximum Stability Margin (MSM) criterion using Lyapunov method. However, controllers designed on the basis of MSM criterion do not possess the inherent good properties of the controller designed on the basis of ISE criterion even though there is improvement in stability [9].…”

Section: Introductionmentioning

confidence: 99%

Genetic algorithm tuned IP controller for Load Frequency Control of interconnected power systems with HVDC links

Selvakumaran¹,

Rajasekaran²,

Karthigaivel³

2014

Archives of Electrical Engineering

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Abstract:A new design of decentralized Load Frequency Controller for interconnected thermal non-reheat power systems with AC-DC parallel tie-lines based on Genetic Algorithm (GA) tuned Integral and Proportional (IP) controller is proposed in this paper. A HVDC link is connected in parallel with an existing AC tie-line to stabilize the frequency oscillations of the AC tie-line system. Any optimum controller selected for load frequency control of interconnected power systems should not only stabilize the power system but also reduce the system frequency and tie line power oscillations and settling time of the output responses. In practice Load Frequency Control (LFC) systems use simple Proportional Integral (PI) or Integral (I) controller. The controller parameters are usually tuned based on classical or trial-and-error approaches. But they are incapable of obtaining good dynamic performance for various load change scenarios in multi-area power system. For this reason, in this paper GA tuned IP controller is used. A two area interconnected thermal non-reheat power system is considered to demonstrate the validity of the proposed controller. The simulation results show that the proposed controller provides better dynamic responses with minimal frequency and tie-line power deviations, quick settling time and guarantees closed-loop stability margin.

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Design of Decentralized Biased Controllers for Load-Frequency Control of Interconnected Power Systems

Cited by 36 publications

References 12 publications

Ancillary Service Requirement Assessment Indices for the Load Frequency Control in a Restructured Power System with Redox Flow Batteries

Ancillary Service Requirement Assessment Indices for the Load Frequency Control in a Restructured Power System with Redox Flow Batteries

MOEA based Design of Decentralized Load-Frequency Controllers for Interconnected Power Systems with AC-DC Parallel Tie-lines and Considering Nonlinearities

Genetic algorithm tuned IP controller for Load Frequency Control of interconnected power systems with HVDC links

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