Analysis of squirrel-cage induction generator start-up supported by reactive power compensator

2019 ◽  
Vol 39 (2) ◽  
pp. 265-278
Author(s):  
Dominik Andrzej Górski
Keyword(s):  
Reactive Power ◽  
Induction Generator ◽  
Power Electronic ◽  
Power Demand ◽  
Content Type ◽  
Grid Connection ◽  
Squirrel Cage ◽  
Squirrel Cage Induction Generator ◽  
Reactive Power Compensator ◽  
Power Electronic Converter

Purpose The power electronic converter is used for the satisfaction of reactive power demand of induction generator, when grid-tied. This paper aims to present an application of STATCOM to reduce inrush transient caused by the connection of a squirrel-cage induction generator (SCIG) to the grid. Design/methodology/approach The power generation system consists of an uncontrolled prime mover, a SCIG and a power electronic converter connected to the grid. The three-phase Neutral Point Clamped (NPC) converter works as a STATCOM to satisfy a reactive power demand of the generator. A control scheme of STATCOM uses the x-y reference frame rotating synchronously with grid voltage vector and the p-q instantaneous power theory to calculate q component of grid power. Findings It is shown that the parallel converter, which works as a reactive power compensator allows decreasing transients during a grid connection of the induction generator. Research limitations/implications Transients during a grid connection of the induction generator are only partially decreased. Practical implications It is needed to compensate for the reactive power of a SCIG. The NPC converter works as a STATCOM. The converter partially reduces grid transients during generator connection. The laboratory tests are demonstrated by connection 7.5 kW induction generator to 8 kVA transformer. Originality/value The paper presents the mitigation of grid transients during connection of induction generator with the power electronic converter working as reactive power compensator.

scholarly journals Determination of Minimum Reactive Power Compensation for the Stable Operation of Type-1 WTG in Grid-Connected Mode

2020 ◽  
Vol 8 (5) ◽  
pp. 4656-4660
Keyword(s):  
Wind Farm ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Induction Generator ◽  
Stable Operation ◽  
Squirrel Cage ◽  
Squirrel Cage Induction Generator ◽  
Reactive Power Compensator ◽  
The Impact

The current energy demand scenario leads to tremendous increase in the renewable energy sector, but the integration of these renewable causes various stability issues of the system. Increasing share Wind energy has several shortages due to its energy harnessed from the wind. These shortages can be improved by compensating reactive power into the wind plant. The wind farm consist of fixed speed squirrel cage Induction generator absorbs reactive power from the grid for stable operation and it can be injected using reactive power compensator. In this context, the main aim of the research is to find the minimum reactive power compensation required for stable operation for different rating of Type-1 WTG in grid connected mode. In this paper, a detailed model of constant speed Squirrel Cage Induction Generator is carried out in MATLAB/SIMULINK-2017a to analyze the need of reactive power compensation to maintain voltage and frequency stability of the system during normal condition. The work also focuses on to investigate the impact of induction generator inertia level on compensation level. The modified IEEE 5-bus radial distribution system is used to conduct these investigations and the simulation results clearly show that: (1) The necessity and minimum additional reactive power support to the wind farm to improve and maintain stability of the system; (2) the inertia level of wind farm and reactive power compensator level both are independent each other.

scholarly journals Converter Compensation of Reactive Power Consumed by the Induction Generato

2021 ◽  
Vol 57 (1) ◽  
pp. 64-79
Author(s):  
Jarosław Tępiński
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Power Grid ◽  
Reactive Power Compensation ◽  
Induction Generator ◽  
Power Electronic ◽  
Induction Generators ◽  
Hydropower Plants ◽  
Reactive Power Compensator ◽  
Power Electronic Converter

Purpose: The purpose of the article is to present a reactive power compensation for small hydropower plants with an induction generator. The classic compensation with capacitors is discussed and its improvement is proposed. Instead of capacitors, a three level power electronic converter connected in parallel to the induction generator can be used to provide reactive power compensation. The purpose of the paper is to present the developed structure of an active compensator and its control method. The developed control method was verified on a laboratory stand. The project and the methods: As part of research, an active compensator was built as a three-level power electronic converter in topology with Neutral Point Clamped. Laboratory tests of a converter compensator were carried out on a stand equipped with an induction generator with a power of 7.5 kW. Laboratory system measurements were made using a power analyzer and an oscilloscope. Results: A control structure of an active compensator based on a voltage-oriented method was presented and discussed. The operation of the con- verter compensator has been verified on a laboratory stand equipped with a 7.5 kW induction generator. The compensator current reduces the reactive (inductive) component of the current consumed from a power grid to a value equal to zero. The reactive power compensator ensures that the tgφ power factor is maintained at a set value of zero, which corresponds to the total compensation of inductive reactive power consumed by an induction generator working in a hydropower plant. Operation of the active compensator did not cause a significant increase in the harmonic content in the current consumed from the power grid. Conclusions: The paper presents the issues regarding reactive power compensation in hydropower plants with induction generators. Commonly used capacitor compensation has been covered and as a result, it is proposed to replace it with power electronics converter compensation of reactive power connected in parallel induction generators. Active compensator provides compensation for the entire reactive power consumed by the induction generator. The use of the converter compensator of reactive power significantly contributes to the reduction of costs for reactive power incurred by the owners of hydropower plants. The reactive power compensator also has a positive impact on the operation of the entire power grid, power losses from the reactive component of the current on the impedances of power grid components are limited. Keywords: renewable source of electricity, reactive power, active compensator, induction generator Type of article: original scientific article

scholarly journals Voltage stability enhancement for large scale squirrel cage induction generator based wind turbine using STATCOM

2021 ◽  
Vol 12 (3) ◽  
pp. 1784
Author(s):  
Abedalgany Athamneh ◽  
Bilal Al Majali
Keyword(s):  
Distribution System ◽  
Large Scale ◽  
Wind Farm ◽  
Reactive Power ◽  
Induction Generator ◽  
Voltage Profile ◽  
Static Synchronous Compensator ◽  
Squirrel Cage ◽  
Voltage Stability Enhancement ◽  
Squirrel Cage Induction Generator

<p><span lang="EN-US">A stable operation of wind turbines connected to the grid is an essential requirement to ensure the reliability and stability of the power system. To achieve such operational objective, installing static synchronous compensator static synchronous compensator (STATCOM) as a main compensation device guarantees the voltage stability enhancement of the wind farm connected to distribution network at different operating scenarios. STATCOM either supplies or absorbs reactive power in order to ensure the voltage profile within the standard-margins and to avoid turbine tripping, accordingly. This paper present new study that investigates the most suitable-location to install STATCOM in a distribution system connected wind farm to maintain the voltage-levels within the stability margins. For a large-scale squirrel cage induction generator squirrel-cage induction generator (SCIG-based) wind turbine system, the impact of STATCOM installation was tested in different places and voltage-levels in the distribution system. The proposed method effectiveness in enhancing the voltage profile and balancing the reactive power is validated, the results were repeated for different scenarios of expected contingencies. The voltage profile, power flow, and reactive power balance of the distribution system are observed using MATLAB/Simulink software. </span></p>

Research on Squirrel-Cage Induction Generator Full Power Converter Control Strategies of Wind Power Generation System with Dynamic Systems

2012 ◽  
Vol 496 ◽  
pp. 104-108
Author(s):  
Bai Shan Mei ◽  
Han Kun Jiang ◽  
Jiang Yu
Keyword(s):  
Power Generation ◽  
Reactive Power ◽  
Power Converter ◽  
Induction Generator ◽  
Variable Speed ◽  
Generation System ◽  
Constant Frequency ◽  
Squirrel Cage ◽  
Squirrel Cage Induction Generator ◽  
Close Loop Control

In this paper, a new control scheme of a variable speed grid connected wind energy generation system was presented. The scheme used a squirrel-cage induction generator (SCIG) as generator and it connected to the grid through a back-to-back double PWM converter. According to the characteristics of induction motor, the generator side adopted rotor flux linkage oriented slip frequency vector control technology, and the grid side used the network voltage oriented control and voltage and current dual close-loop control strategy. The simulation results show that the system can work in the state of variable speed constant frequency (VSCF)power generation and the active and reactive power can be controlled with no mutual interference and with good static-dynamic performance.

An Insightful Steady-State Performance of a Squirrel Cage Induction Generator Enhanced with STATCOM

2014 ◽  
Vol 15 (3) ◽  
pp. 205-215 ◽  
Author(s):  
Olorunfemi Ojo ◽  
Mehdy Khayamy ◽  
Mehari Bule
Keyword(s):  
Steady State ◽  
Reactive Power ◽  
Voltage Source ◽  
Induction Generator ◽  
Squirrel Cage ◽  
Steady State Operation ◽  
Terminal Voltage ◽  
Squirrel Cage Induction Generator ◽  
Generator Terminal ◽  
Static Compensator

Abstract This paper presents the regulation of the terminal voltage and reactive power of a grid-connected squirrel cage induction generator. A shunt connected voltage source inverter (VSI) with a capacitor in the DC side operating as a Static Compensator (STATCOM) and a shunt capacitor are used for regulating the generator terminal voltage and limit the reactive power demand from the grid. Simulation results for steady-state operation for a wide variation of speed in the super-synchronous region are presented as well as the dynamic stability of the system. Closed-form steady-state characteristics equations for the system are used to determine key variables and to demonstrate how the operation of the system depends on various parameters. This characteristics curve which contains all of the equations of the system provides the all in one insightful view to the inherent characteristics of the system and the effect of the parameter variation on the terminal voltage plane.

Operation and control of a stand-alone power system with integrated multiple renewable energy sources

2021 ◽  
pp. 0309524X2110241
Author(s):  
Nindra Sekhar ◽  
Natarajan Kumaresan
Keyword(s):  
Renewable Energy ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Solar Pv ◽  
Power Requirement ◽  
Squirrel Cage ◽  
Hysteresis Controller ◽  
Squirrel Cage Induction Generator ◽  
And Control

To overcome the difficulties of extending the main power grid to isolated locations, this paper proposes the local installation of a combination of three renewable energy sources, namely, a wind driven DFIG, a solar PV unit, a biogas driven squirrel-cage induction generator (SCIG), and an energy storage battery system. In this configuration one bi-directional SPWM inverter at the rotor side of the DFIG controls the voltage and frequency, to maintain them constant on its stator side, which feeds the load. The PV-battery also supplies the load, through another inverter and a hysteresis controller. Appropriately adding a capacitor bank and a DSTATCOM has also been considered, to share the reactive power requirement of the system. Performance of various modes of operation of this coordinated scheme has been studied through simulation. All the results and relevant waveforms are presented and discussed to validate the successful working of the proposed system.

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