Maiden Voltage Control Analysis of Hybrid Power System With Dynamic Voltage Restorer

Abstract

This work is a maiden attempt towards the voltage stability enhancement of a hybrid power system (HPS) comprising of Parabolic Trough solar power (PSP), Dish-Stirling Solar Power (DSP) and diesel generator (DG). DSP coupled with induction generator requires reactive power for its field winding to be magnetized whereas PSP employing permanent magnet synchronous generator (PMSG) doesn't require reactive power for excitation. So, it's worthwhile to infer that PSP reduces the reactive power requirement for its own functionality and may meet the same load demand at low voltage compensation. Lower voltage compensation requirement results in higher voltage stability. Besides, dynamic responses of the system are also improved as the HPS has been incorporated with Voltage Compensating Devices (VCDs) like Static Var Compensator (SVC), Static Synchronous Compensator (STATCOM) and Dynamic Voltage Restorer (DVR). Inclusion of FACTS devices reduces the probability of the transient voltage instability. HPS with FACTS devices under PSP has been subjected to the critical change in load with positive and negative infinite slope at regular interval of time to see the system practicality and its feasibility. The graphical and numerical analysis of the proposed system explicitly shows that the proposed HPS with PSP retains the system voltage stability with great margin under DVR. The efficient hybrid power system as a whole has been achieved to maintain the system reliability in terms of voltage because of the presence of PSP and DVR. INDEX TERMSParabolic trough solar power (PSP), Dish-Stirling solar power (DSP), Permanent magnet synchronous generator (PMSG), Dynamic Voltage Restorer (DVR), mine blast algorithm (MBA) NOMENCLATURE Variable Description QDG Reactive power supplied by diesel generator. QLOAD Load demand QDSP Reactive power of DSP QPSP Reactive power of PSP QSVC Reactive power of SVC QSTATCOM Reactive power of STATCOM. QDVR Reactive power of DVR. Xm Reactance of DSP Xeq Equivalent reactance Req Equivalent resistance IG Induction Generator KF Gain of regulator stabilizing circuit TF Time constant of regulator stabilizing circuit TA Time constant of regulator amplifier KA Gain of regulator amplifier ∆Efd Change in exciter voltage ∆EM Change in electromagnetic energy of IG Td, Tα Dead zone time for zero crossings of the STATCOM controller and transport lag. Δα Deviation in phase angle at STATCOM. ΔV, Vref, ΔVa, ΔVf Change in system voltage, reference voltage, voltage of amplifier and exciter, respectively.

Isolated and Interconnected Multi-Area Hybrid Power Systems: A Review on Control Strategies

“…DVR plays a vital role in mitigating the voltage deviation that is why this device is used in removing the problems pertaining to voltage sags and swells. However, the application of DVR in HPS for voltage stabilization is depicted in [120]. The representation of different voltage compensating devices for renewable integrated HPS is displayed in Table 2 Where tick mark () represents presence of feature and cross mark (x) represents absence of feature in the system.…”

Static-Voltage-Stability Analysis of Renewable Energy-Integrated Distribution Power System Based on Impedance Model Index

“…The updated version retained the concepts of angle stability, frequency stability, and voltage stability, while introducing concepts like resonant stability and inverter-driven stability [4]. Thus, whether in traditional or modern power systems, angle stability [5], frequency stability [6], and voltage stability [7] remain core stability concerns. Voltage stability in power systems can be categorized into largedisturbance voltage stability and small-disturbance voltage stability.…”

Static Voltage Stability Analysis of Renewable Energy Integrated Distribution Power System based on Impedance Model Index

“…The updated version retained the concepts of angle stability, frequency stability, and voltage stability while introducing concepts like resonant stability and inverter-driven stability [4]. Thus, whether in traditional or modern power systems,angle stability [5], frequency stability [6], and voltage stability [7] remain core stability concerns. Voltage stability in power systems can be categorized into large disturbance voltage stability and small disturbance voltage stability.…”