Developing Function Models of Back-to-Back PWM Converters for Simplified Simulation

Van, Tan Luong; Lee, Dong-Choon

doi:10.6113/jpe.2011.11.1.051

Cited by 10 publications

(8 citation statements)

References 10 publications

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“…For the configurations that uses a back to back converter as in the conceptual schematics 3 and 4, two control topologies is considered where a resonant controller is taken into consideration to regulate the overall voltage at the output of the transformer [15], and the dq transformation technique is used to control the voltage at the DC link terminals [16], whereby the overall controller adds or decrease voltage (20% -30%) to/from the total output voltage in order to control the whole output voltage of the transformer. The total output voltage control for the output of the transformer is explained as the following:…”

Section: Control Topologiesmentioning

confidence: 99%

Var control considerations for the design of hybrid distribution transformers

Radi

Darwish

2015

11th IET International Conference on AC and DC Power Transmission

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The demand of reactive power in the last mile of the networks is increasing by the time due to the change of loading types by time, beside increasing the total demand itself where new technologies are being introduced depend mainly on different types of electrical support such as electrical cars and more electronic devices in consumption process [1]. This expected situation would lead to take into consideration new approaches in the last mile substations in order to mitigate the drawbacks of the conventional legacy and that by providing more functions in the last mile substations that could provide more flexibility and functionality regarding voltage level, reactive power (RP), amount of demand and losses [1]. This paper focuses the light on the consideration that are taken in designing a distribution transformer that provide additional abilities in regulating the voltage and controlling the RP that is injected in the distribution network (DN) by using a fractional rated converter that is attached partially with the windings of the transformer. This approach aims mainly to enhance the unit with more flexibility in controlling the flow the of the RP at the last mile of the network in order to decrease the losses that are caused by transmitting RP through long transmission networks. The design of the power electronics (PE) modules is detailed and its functionality in compensating Var power is discussed. This approach contributes in meeting the future expectations of the low voltage (LV) networks changes and loading, this contribution is comprised of providing the substation unit with fractional rated power electronic converter that is attached partially with the winding of the LV transformer to provide the load with a specific level of its demand from RP, whereby the solid state switches are controlled according to the immediate need for Var control and support in low voltage (LV) networks [1].

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Section: Control Topologiesmentioning

confidence: 99%

Var control considerations for the design of hybrid distribution transformers

Radi

Darwish

2015

11th IET International Conference on AC and DC Power Transmission

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“…The capability of each configuration is summarised in Table 1. V. CONTROL TOPOLOGY A resonant controller is taken into consideration to track a sinusoidal wave reference beside the need of controlling specific harmonic orders for a resistive load. Also, the dq transformation technique is used to control the voltage at the DC link terminals [12], whereby the overall controller adds or decrease voltage (10% -20%) to/from the total output voltage in order to control the whole output voltage of the transformer. The transformer supports a part of supplied voltage and the PE converter controls the other part of the voltage (voltage variations).…”

Section: Three Windings Transformermentioning

confidence: 99%

“…A vector control is one of the most popular methods used for voltage source converter (VSC) [12]. Control structure of the VSC in the DC side [13] Voltage and currents are described as vectors in the stationary αβ and transformed after that to dq coordinates to be controlled by two loops: inner loop for the current control and outer loop for the DC voltage control.…”

Section: A Dc-link Vector Controlmentioning

confidence: 99%

Voltage regulation considerations for the design of hybrid distribution transformers

Radi¹,

Darwish²,

Alqarni

2014

2014 49th International Universities Power Engineering Conference (UPEC)

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Abstract-The future substation depends on finding a way to mitigate the effects of the drawbacks of the conventional legacy by employing the efficiency of the solid state switches [1]. This paper discusses the considerations of designing a distribution transformer that provides additional functions in regulating the voltage and controlling the reactive power that is injected in the distribution network, using a fractional rated converter attached partially with the windings of the transformer. This approach aims mainly to enhance the unit with more flexibility in controlling the voltage at the last mile of the network, in order to decrease the losses and meet the future expectations for low voltage networks modifications, and that by using a power electronic (PE) approach has less losses and more functionality (depending on the reliability of transformer and intelligence of PE). The design of a hybrid distribution transformer is detailed and its functionality in regulating the voltage is discussed as a combination between the features of one of the most reliable network devices, the transformer, and the effect of PE existence with less losses in both switching and conduction losses. Reduced ratings PE are used in this approach, whereby the solid state switches are controlled according to the immediate need for voltage control in low voltage (LV) networks.

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“…Since the flicker calculation requires a long simulation time (10 minutes for the short-term flicker), it is inconvenient to use the actual model of power switches for the flicker investigation in the wind power systems. So, the back-to-back PWM converters using actual switching power devices can be replaced by the function model which consists of the controlled-current sources and the controlled-voltage sources [19]. With this function model, the simulation executing time for the flicker analysis in DFIG wind turbine systems is significantly reduced by about 80%.…”

Section: Model Of Wind Turbine Systemsmentioning

confidence: 99%

Flicker Suppression Scheme for Variable-Speed Wind Turbine Systems

Van¹,

Nguyễn²,

Lee³

2012

Journal of Power Electronics

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This paper proposes a strategy of flicker mitigation for doubly-fed induction generator (DFIG) wind turbine systems. In the weak grid system where the grid impedance ratio is low, the reactive power compensation only cannot suppress the flicker sufficiently due to the limited power capacity of the converters or the DFIG. For the full suppression of flickers, the active power smoothening using the energy storage system (ESS) needs to be utilized together with the reactive power compensation. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation results for a 2[MW] DFIG wind turbine system and by experimental results for a 3[kW] wind turbine simulator.

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Developing Function Models of Back-to-Back PWM Converters for Simplified Simulation

Cited by 10 publications

References 10 publications

Var control considerations for the design of hybrid distribution transformers

Var control considerations for the design of hybrid distribution transformers

Voltage regulation considerations for the design of hybrid distribution transformers

Flicker Suppression Scheme for Variable-Speed Wind Turbine Systems

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