Thyristor‐based flexible ac transmission system for controlling the vanadium redox flow battery

Ontiveros, Leonardo Javier; Mercado, Pedro

doi:10.1049/iet-rpg.2012.0361

Cited by 7 publications

(9 citation statements)

References 21 publications

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“…The ESS model is developed taking into account the VRFB characteristics [19, 20], the operation mode of the ESS (it continuously balances the random variations of the PS by charging and discharging) and as it was previously mentioned the fact that in Δ t time periods the ESS has already worked and the steady state is reached. Therefore, the dynamic characteristics of charge and discharge rates are not considered.…”

Section: Power System Modelmentioning

confidence: 99%

Optimal sizing method of vanadium redox flow battery to provide load frequency control in power systems with intermittent renewable generation

Martínez

Molina

Mercado

2017

IET Renewable Power Generation

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This study proposes a novel methodology for optimal sizing of a vanadium redox flow battery (VRFB) aiming at providing the load frequency control (LFC) of power system (PSs) with renewable generation, such as wind generation. This methodology utilises a new optimisation problem, where the optimal size of the VRFB is an endogenous result from the model of optimisation problem. To resolve the new optimisation problem, a hybrid optimisation model (HOM) is employed in order to calculate the optimal investment for the VRFB (optimal size) while taking into account both its impact on the PS costs and on the quality of the system frequency. Through stochastic optimisation, the HOM allows computing the variable operating costs and VRFB investment costs, considering the uncertainties associated to the PS. This stochastic optimisation utilises a new quasi-stationary simulations of the PS operation, which demands lower computing effort. To this aim, this study proposes a novel modelling approach of both the VRFB and the PS operation. Moreover, statistical indexes are proposed as new factor used in sizing the LFC operating reserve. The results show that the developed methodology allows evaluating with precision the stochastic characteristics of the PS.

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Section: Power System Modelmentioning

confidence: 99%

Optimal sizing method of vanadium redox flow battery to provide load frequency control in power systems with intermittent renewable generation

Martínez

Molina

Mercado

2017

IET Renewable Power Generation

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“…Thyristor converter with commutated capacitors A DC/AC bidirectional converter is required in order to connect the VRFB to the MG. In this regard, a 12-pulse thyristor converter with commutated capacitors on the AC side (TCCC) is proposed for controlling the active power flow of the VRFB [21]. The TCCC operates as a current source.…”

Section: Mechanical Modelmentioning

confidence: 99%

“…The low-level and mid-level control systems are fully developed in Ref. [21], whereas the highlevel control system (left side of Figure 5) is presented below which represents the main contribution of this work. Redox -Principles and Advanced Applications…”

Section: Control System Of the Tcccmentioning

confidence: 99%

“…When the control strategy developed in Ref. [21] is employed (previous control strategy), the frequency reaches the value of 52 Hz at t = 152.9 s; at this instant the wind farm switches off due to over-frequency. After that, the load is higher than the power generation, hence the system frequency decreases.…”

Section: Case 1: Unexpected Disconnection Of the Mg During Energy Expmentioning

confidence: 99%

“…Based on the previous discussion, this work employs the PCS presented by the same authors in Ref. [21] and develops a new control strategy, which performs the load leveling of the wind farm and the frequency regulation of the MG. The PCS consists of a 12-pulse thyristor converter with commutated capacitors (TCCC).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Control Strategy to Integrate Flow Batteries into AC Micro-Grids with High Wind Power Penetration

Ontiveros¹,

Suvire²,

Mercado³

2017

Redox - Principles and Advanced Applications

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The penetration of wind generation into AC micro-grids (MGs) has been increasing in recent years. Wind generation is uncontrollable, variable in nature, and uncertain. If the penetration level is high, the random variations of the wind power generation could cause problems for MGs to maintain the nominal system frequency. A typical solution is to employ energy storage systems (ESS) into the MG in order to compensate the wind power fluctuations. In this chapter, the use of a vanadium redox flow battery (VRFB) coupled with a power conditioning system (PCS) is suggested to enhance the frequency stability of a MG with high wind power penetration. A new control system is developed for the PCS/VRFB. The control system performs the load leveling of the wind generation and carries out the primary and secondary frequency control of the MG. Dynamic simulations of the proposed device are performed and demonstrate that the new control system improves the transient responses of the PCS/VRFB and the MG, during minor and/or severe disturbances.

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Power conditioning system coupled with a flow battery for wind energy applications: modelling and control design

Ontiveros

Suvire

Mercado

2017

IET Renewable Power Generation

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Wind generation (WG) is the most widespread renewable energy resource in the world. However, this implementation inevitably leads to an increase in the problems caused by WG, e.g. frequency oscillations, power fluctuations or voltage variations. To overcome these problems, the use of a power conditioning system (PCS) coupled with a vanadium redox flow battery (VRFB) is proposed in this study. The PCS is composed of a distribution static synchronous compensator connected to a dc/dc chopper. The PCS/VRFB detailed model is presented and a three-level control system is developed. This control system allows the PCS/VRFB to perform a decoupled reactive and active power flow control. The dynamic response of the PCS/VRFB is evaluated through simulation tests, and performance characteristics of the device are obtained by means of the variation of the power references. The results obtained demonstrate that the PCS/VRFB offers a good transient response and the control system proposed allows mitigating the problems caused by wind power generation.

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Thyristor‐based flexible ac transmission system for controlling the vanadium redox flow battery

Cited by 7 publications

References 21 publications

Optimal sizing method of vanadium redox flow battery to provide load frequency control in power systems with intermittent renewable generation

Optimal sizing method of vanadium redox flow battery to provide load frequency control in power systems with intermittent renewable generation

A New Control Strategy to Integrate Flow Batteries into AC Micro-Grids with High Wind Power Penetration

Power conditioning system coupled with a flow battery for wind energy applications: modelling and control design

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