Multivariable predictive control considering time delay for load-frequency control in multi-area power systems

Abstract

In this paper, a multivariable model based predictive control (MPC) is proposed for the solution of load frequency control (LFC) in a multi-area interconnected power system. The proposed controller is designed to consider time delay, generation rate constraint and multivariable nature of the LFC system, simultaneously. A new formulation of the MPC is presented to compensate time delay. The generation rate constraint is considered by employing a constrained MPC and economic allocation of the generation is further guaranteed by an innovative modification in the predictive control objective function. The effectiveness of proposed scheme is verified through time-based simulations on the standard 39-bus test system and the responses are then compared with the proportional-integral controller. The evaluation of the results reveals that the proposed control scheme offers satisfactory performance with fast responses.

Load frequency predictive control for power systems concerning wind turbine and communication delay

“…Similar works on the topic of MPC for LFC of power system can be found in References 29‐31. In terms of communication delay, Reference 32 reconstructed the cost function of predictive controller to compensate the communication delay of LFC system, and the proposed control scheme can achieve smoother state response. In Reference 33, a coordination model predictive controller was designed based on LFC equivalent model of communication delay, and compared with PI controller, this controller has better control performance under various disturbances.…”

Modified group search optimisation‐based comparative performance evaluation of thyristor controlled series capacitor‐based fractional order damping controllers to improve load frequency control performance in restructured environment

“…This time latency can be regarded on the area control error (ACE) signal. Furthermore, the time delay can be introduced during transmission of the LFC centre output to the individual GENCOs [8,13,[16][17][18]. The delaydependent stability analysis of the power system with a LFC scheme for constant, time-varying, and random time delays are is investigated in [8,11,12,14].…”

“…System damping responses obtained due to different time delays imposed to the power system in scenario 1 are gathered in Table 5. For the purpose of this research as a comprehensive study, the communication delays are considered on the both control input and control output of the LFC system, concurrently [16][17][18]. An exponential function e -τs is used to describe the communication delay where τ gives the communication delay time [17].…”

Load frequency control of three area power system using optimal tuning of fractional order proportional integral derivative controller with multi objective grey wolf optimization

“…Load frequency control is of great importance in electric power system operation to damp frequency and voltage oscillations originating from load variations or sudden changes in load demands (B.Prakash Ayyappan and R.Kanimozhi 2021). In an interconnected power system that consists of several control areas, as if the system parameter varies then the grid tie-line power will change and the frequency deviations will occur (Sabah Daniar, Mojtaba Shiroei and Tahmat Aazami 2016). In a power system with huge interconnections, transient conflicts promote disturbances inside the system (S.Selvakumaran, V.Rajasekaran and R. Karthigaivel 2014).…”