scholarly journals Transient Performance Analysis of Reactive Power Compensators at LCC-HVDC Station Feeding Weak AC System

2021 ◽  
Vol 40 (4) ◽  
pp. 835-841
Author(s):  
Atiq Ur Rehman ◽  
Mehr Gul ◽  
Talha Mir ◽  
Syed Mudassir Hussain ◽  
Zahid Rauf
Keyword(s):  
Performance Analysis ◽  
Reactive Power ◽  
Short Circuit ◽  
Dynamic Performance ◽  
Poor Performance ◽  
Voltage Regulation ◽  
Comparative Performance ◽  
Dc System ◽  
Electromagnetic Transient Simulation ◽  
Bus Voltage

This paper focuses on analyzing the dynamic performance of various reactive power compensators at weak LCC-HVDC terminals. Four scenarios based on combination of active and passive reactive power compensation schemes are presented. The comparative performance analysis of various compensators in different types of AC and DC system faults are evaluated using electromagnetic transient simulation program PSCAD/EMTDC. The analysis shows that fixed capacitor has poor performance and results in reducing effective short circuit ratio of system, while STATCOM on the other hand, increases AC system strength and has significant performance in areas like immunity to commutation failure, suppression of temporary overvoltage, AC bus voltage regulation and fault recovery time.

scholarly journals Techniques for Ensuring Fault Ride-Through Capability of Grid Connected DFIG-Based Wind Turbine Systems: A Review

2021 ◽  
Vol 18 (1) ◽  
pp. 39-46
Author(s):  
M. Shuaibu ◽  
A.S. Abubakar ◽  
A.F. Shehu
Keyword(s):  
Renewable Energy ◽  
Wind Turbine ◽  
Electricity Market ◽  
Energy Demand ◽  
Reactive Power ◽  
Short Circuit ◽  
Renewable Energy Sources ◽  
Dynamic Performance ◽  
Energy Sources ◽  
Fault Ride Through

Renewable energy sources (RES) are being integrated to electrical grid to complement the conventional sources to meet up with global electrical energy demand. Among other RES, Wind Energy Conversion Systems (WECS) with Doubly Fed Induction Generator (DFIG) have gained global electricity market competitiveness because of the flexible regulation of active and reactive power, higher power quality, variable speed operation, four quadrant converter operation and better dynamic performance. Grid connected DFIG-based WECS are prone to disturbances in the network because of direct connection of stator windings to grid. The ability of the Wind Turbine (WT) to remain connected during grid faults is termed the Fault Ride-Through (FRT) capability. The grid code requirement for integrating the DFIG-based WTs to power networks specified that they must remain connected and support the grid stability during grid disturbances of up to 1500 ms. The use of compensation devices offers the best FRT compliance thereby protecting the DFIG and the converters from voltage fluctuations and over currents during the grid fault. The paper presents a review of techniques employed in ensuring FRT compliance. The article also proposes the state-of-the-art techniques for compensating voltage sag/swell and limiting the fault short-circuit current. Keywords: Renewable energy sources, DFIG, wind turbine system, fault ride-through, grid codes, dual-functional DVR

scholarly journals STATCOM’s contribution to the improvement of voltage plan and power flow in an electrical transmission network

2018 ◽  
Vol 8 (1) ◽  
pp. 41-52
Author(s):  
Adel Amiar ◽  
Mohamed Adjabi
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Dynamic Performance ◽  
Voltage Regulation ◽  
Transmission Network ◽  
Electrical Transmission ◽  
Transmission Systems ◽  
Power Transmission Systems ◽  
Flexible Alternating Current Transmission

Flexible alternating current transmission systems are used since nearly four decades and present very good dynamic performances. The purpose of this work is to study the behaviour of a system where static compensator (STATCOM) is located at the midpoint of a long transmission line functioning in disturbed modes with various levels of load caused by tripping and then, reclosing of the incoming station breaker. The studied model and starting from the analysis of various alternatives will lead to the checking of the aptitude of the STATCOM to maintain the voltage plan and to improve the power flow in electro-energetic system which is the east region of Algerian 400 kV transmission network. The steady state performance of STATCOM’s controller is analysed through computer simulations with MATLAB/Simulink program. The simulation results have demonstrated that STATCOM can be effectively applied in power transmission systems to solve the problems of poor dynamic performance and voltage regulation.   Keywords: STATCOM, reactive power, power flow, voltage plan, breaker automatic recloser.

scholarly journals Impact of large photovoltaic power penetration on the voltage regulation and dynamic performance of the Tunisian power system

2020 ◽  
Vol 38 (5) ◽  
pp. 1774-1809
Author(s):  
Abdelaziz Salah Saidi
Keyword(s):  
Power System ◽  
Short Circuit ◽  
Dynamic Performance ◽  
Flow Analysis ◽  
Flow Simulation ◽  
Voltage Regulation ◽  
Load Flow ◽  
Grid Systems ◽  
Transmission Grid ◽  
Photovoltaic Power

By the year 2023, the Tunisian power transmission grid has been projected to include photovoltaic pool of power of 937 MW, scattered throughout the whole landscape of the nation. This paper investigates high photovoltaic energy penetration impacts voltage regulation and dynamic performance of the grid. Load flow analysis is implemented to investigate the power system capability for the case of incorporating the desired photovoltaic power. Computer-based simulations have been used for evaluating the upgradation of the grid. Moreover, the study is based on bifurcation diagrams taking the photovoltaic generation as a bifurcation parameter and time response simulations to grid disturbances. Professional PSAT simulation toolbox has been used for the power flow simulation studies. Network- related faults like outage of photovoltaic farm event, three-phase short-circuit at a conventional bus, and voltage dip at the largest photovoltaic station have been considered. It is hoped that the results of the presented study would benefit Tunisian’s utility’s policies on integration of PV systems. Moreover, this comprehensive analysis and study will be a valuable guide for assessing and improving the performance of national grid systems of any other countries also, that gives the huge potential and need for solar energy penetration into the grid systems.

scholarly journals Regulation of Voltage and Reactive Power Based on the Control of Leading Phase Operation of Generator

2014 ◽  
Vol 8 (1) ◽  
pp. 522-526
Author(s):  
Wei Yan-fang ◽  
Zheng Zheng ◽  
Sun Yan-zhou ◽  
Zhang Tao ◽  
Si Ji-ka ◽  
...  
Keyword(s):  
Power System ◽  
Software Package ◽  
System Analysis ◽  
Reactive Power ◽  
Short Circuit ◽  
Voltage Regulation ◽  
Analysis Software ◽  
Power System Analysis ◽  
Actual Operation ◽  
Short Circuit Fault

Leading phase operation of generator is an effective method for the control and regulation of voltage and reactive power of power system. The ability of voltage regulation for key buses by control of generator is presented in this paper. The PSD-BPA software - Power System Analysis Software Package (PSD-BPA) is introduced firstly. The management database for leading phase operation of generator is discussed. From the lagging phase operation to leading phase operation of generator, the change curves of voltage for main 500kV bus and 220kV bus are analyzed. The sensitivity on voltage regulation of each generator of leading phase operation is given. Based on the analysis of short circuit fault of power plant, the limit output power of leading phase operation of multi-generators is proposed. The leading phase operation of generator has many advantages, such as easy to operate, simple and feasible implement, and the actual operation is safe and reliable. The technique was worthy to be widely used.

scholarly journals Control and Validation of a Reinforced Power Conversion System for Upcoming Bioelectrochemical Power to Gas Stations

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1470
Author(s):  
Mahdi Shahparasti ◽  
Amirhossein Rajaei ◽  
Andres Tarraso ◽  
Jose David Vidal Leon Romay ◽  
Alvaro Luna
Keyword(s):  
Energy Storage ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Electrical Network ◽  
External Control ◽  
Gas Stations ◽  
Current Reference ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power To Gas

This paper presents a proposal for potential bioelectrochemical power to gas stations. It consists of a two-level voltage source converter interfacing the electrical grid on the AC side and an electromethanogenesis based bioelectrochemical system (EMG-BES) working as a stacked module on the DC side. The proposed system converts CO2 and electrical energy into methane, using wastewater as the additional chemical energy input. This energy storage system can contribute to dampening the variability of renewables in the electrical network, provide even flexibility and grid services by controlling the active and reactive power exchanged and is an interesting alternative technology in the market of energy storage for big energy applications. The big challenge for controlling this system lays in the fact that the DC bus voltage of the converter has to be changed in order to regulate the exchanged active power with the grid. This paper presents a cascade approach to control such a system by means of combining external control loops with fast inner loops. The outer power loop, with a proportional-integral (PI) controller with special limitation values and anti-windup capability, is used to generate DC bus voltage reference. An intermediate loop is used for DC bus voltage regulation and current reference generation. A new proportional resonant controller is used to track the current reference. The proposed scheme has been validated through real-time simulation in OPAL OP4510.

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