A STATCOM with Supercapacitors for Low-Voltage  Ride-Through in Fixed-Speed Wind Turbines

Obando-Montaño, Andrés Felipe; Carrillo, C.; Cidrás, J.; Diaz-Dorado, E.

doi:10.3390/en7095922

Cited by 17 publications

(19 citation statements)

References 37 publications

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“…If connected to a source of power or to an energy storage system, it can also be used to inject active power [41]. This capability is useful for power losses compensation and to grid support in imbalance conditions [42,43].…”

Section: Control Schemes For the Microgrid With Statcommentioning

confidence: 99%

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Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids

Camacho

Castilla

Canziani³

et al. 2017

Energies

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Several control schemes specifically designed to operate inverter-based industrial microgrids during voltage sags have been recently proposed. This paper first classifies these control schemes in three categories and then performs a comparative analysis of them. Representative control schemes of each category are selected, described and used to identify the main features and performance of the considered category. The comparison is based on the evaluation of several indexes, which measure the power quality of the installation and utility grid during voltage sags, including voltage regulation, reactive current injection and transient response. The paper includes selected simulation results from a 500 kVA industrial microgrid to validate the expected features of the considered control schemes. Finally, in view of the obtained results, the paper proposes an alternative solution to cope with voltage sags, which includes the use of a static compensator in parallel with the microgrid. The novelty of this proposal is the suitable selection of the control schemes for both the microgrid and the static compensator. The superior performance of the proposal is confirmed by the analysis of the quality indexes. Its practical limitations are also revealed, showing that the topic studied in this paper is still open for further research.

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Section: Control Schemes For the Microgrid With Statcommentioning

confidence: 99%

“…Note that this control scheme causes the absorption of some amount of active power from the utility grid, as shown in Figure 8. Therefore, the STATCOM must have the ability to absorb active power, which can be used for charging the installed energy storage system [41][42][43].…”

Section: Control Schemes For the Microgrid With Statcommentioning

confidence: 99%

Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids

Camacho

Castilla

Canziani³

et al. 2017

Energies

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“…In [16][17][18][19], the effect of FACTS devices is reported to regulate bus voltage and, therefore, to improve the rotor speed stability and voltage fault ride-through (FRT) of the fixed-speed wind generator during and after disturbances. However, solutions based on FACTS are considered expensive [20].…”

Section: Introductionmentioning

confidence: 99%

Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller

et al. 2015

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A common problem in wind power plants involves fixed-speed wind turbines. In fact, being equipped with a squirrel-cage induction generator (SCIG), they tend to drain a relevant amount of reactive power from the grid, potentially causing voltage drops and possible voltage instability. To improve SCIG power quality and transient stability, this paper investigates a new control strategy for pitch angle control based on proportional-integral (PI) controller and a fuzzy logic controller (FLC), considering both normal and fault ride-through (FRT) schemes. In the literature, often, the mechanical torque output is assumed constant for a specific wind speed. This might not be accurate, because the mechanical torque-speed typical of a wind turbine depends also on the power coefficient or pitch angle. In this paper, an analytic model of transient stability is proposed using the equivalent circuit of the SCIG and using the concepts of stable and unstable electrical-mechanical equilibrium. The method has been evaluated by comparing the results obtained by the analytic method with the dynamic simulation. The results show that the proposed hybrid controller is effective at smoothing the output power and complying with FRT requirements for SCIG in the power system.

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“…especially under grid fault conditions, and if the wind power generators trip offline for self-protection, this will deteriorate the grid conditions and make the grid more difficult to recover [4]. To address these issues, on the one hand, wind farms generally need to install reactive power compensation devices, such as Static VAR (volt ampere reactive) compensators (SVCs), static compensators (STATCOMs) etc., for wind generators to provide quick reactive power compensation and grid voltage support [5][6][7]; on the other hand, some control strategies based on the wind turbine pitch angle control or energy storage system have been proposed to smooth the wind power fluctuations or enhance the low voltage ride-through (LVRT) capability of wind generators [8].…”

Section: Introductionmentioning

confidence: 99%

Electronic Power Transformer Control Strategy in Wind Energy Conversion Systems for Low Voltage Ride-through Capability Enhancement of Directly Driven Wind Turbines with Permanent Magnet Synchronous Generators (D-PMSGs)

Huang

Mao

et al. 2014

Energies

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This paper investigates the use of an Electronic Power Transformer (EPT) incorporated with an energy storage system to smooth the wind power fluctuations and enhance the low voltage ride-through (LVRT) capability of directly driven wind turbines with permanent magnet synchronous generators (D-PMSGs). The decoupled control schemes of the system, including the grid side converter control scheme, generator side converter control scheme and the control scheme of the energy storage system, are presented in detail. Under normal operating conditions, the energy storage system absorbs the high frequency component of the D-PMSG output power to smooth the wind power fluctuations. Under grid fault conditions, the energy storage system absorbs the redundant power, which could not be transferred to the grid by the EPT, to help the D-PMSG to ride through low voltage conditions. This coordinated control strategy is validated by simulation studies using MATLAB/Simulink. With the proposed control strategy, the output wind power quality is improved and the D-PMSG can ride through severe grid fault conditions.

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A STATCOM with Supercapacitors for Low-Voltage Ride-Through in Fixed-Speed Wind Turbines

Cited by 17 publications

References 37 publications

Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids

Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids

Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller

Electronic Power Transformer Control Strategy in Wind Energy Conversion Systems for Low Voltage Ride-through Capability Enhancement of Directly Driven Wind Turbines with Permanent Magnet Synchronous Generators (D-PMSGs)

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