Feasibility Studies for Dynamic VAR and STATCOM Applications to Prevent a Fast Voltage Collapse

Sarmiento, H.G.; Pampin, G.; Leon, J.D. de

doi:10.1109/tdc.2006.1668727

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…10c. This figure shows that this current is going up to 2.6 pu during the fault period to compensate the drop in the voltage; this value is verifying the calculated results for STATCOM current maximum value during fault using (10).…”

Section: Simulation Resultssupporting

confidence: 85%

“…For wind farms the FRT requirements are formulated in the form of voltage against time curve [10,11]. A turbine FRT capability is its ability to survive a transient voltage dip without tripping.…”

Section: Assessment Of Frt Capabilitymentioning

confidence: 99%

“…The energy storage device is a relatively small DC capacitor, and hence the STATCOM is capable of only reactive power exchange with the transmission system. The difference between the converter output voltage and the PCC bus voltage basically determines the flow of reactive power through the coupling transformer to or from the system [10]. The wind turbines have limitations in terms of achieving grid code compliance in several countries.…”

Section: Statcom For Reactive Power Supportmentioning

confidence: 99%

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Static synchronous compensator sizing for enhancement of fault ride‐through capability and voltage stabilisation of fixed speed wind farms

Mahfouz

El-Sayed

2014

IET Renewable Power Generation

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High penetration level of wind energy affects the generation profile of the power systems, which impose more stringent connection requirements of wind farms. The ability of wind power plant to remain connected during grid faults is very important to avoid cascaded outages because of power deficit. FACT devices are considered to be a key technology to accomplish these requirements. The implementation of three-level inverter based on a static synchronous compensator (STATCOM) for the improvement of the ride-through and stability of fixed speed wind farms is analysed here. This brings the challenges for system planner to determine the appropriate STATCOM rating. This study provides a simple approach to evaluate the STATCOM rating for voltage-level regulation at the point of common coupling around its pre-specified value. Vector current control is used as robust control to inject the required reactive power from STATCOM. This study emphasizes also on the analysis of torque speed curve to evaluate the induction generator speed limit and for defining the critical clearing time of the fault according to the selected STATCOM rating. Simulation results under fault conditions are performed to validate the enhancement of wind farm low-voltage ride-through capability and increasing the critical clearing time by installing STATCOM.

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Section: Simulation Resultssupporting

confidence: 85%

Section: Assessment Of Frt Capabilitymentioning

confidence: 99%

Section: Statcom For Reactive Power Supportmentioning

confidence: 99%

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Static synchronous compensator sizing for enhancement of fault ride‐through capability and voltage stabilisation of fixed speed wind farms

Mahfouz

El-Sayed

2014

IET Renewable Power Generation

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“…Thisinductance accounts for the leakage of the actual power transformers, and a resistance in series with the AC lines to represent the inverter and transformer conduction losses.STATCOM operates in two modes either inductive or capacitive mode depending on the difference of the voltage levels at PCC and the fundamental component of the inverter output. By neglecting the harmonic components generated by switching pattern, the switching function of the STATCOM can be changed according alpha( ) , the phase angle which relates the phase difference between pwer system volatge at PCC and the inverter output voltage of [11][12].…”

Section: Statcom Modelmentioning

confidence: 99%

Modeling and Reactive Power Control of Wind and Fuel Cell Technologies in Distribution Networks

Mahfouz¹,

El-Sayed²

2024

RE&PQJ

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Abstract. An integrated scheme of wind and fuel cell renewable energy technologies in distribution networks for electrical energy generation from renewable resources is digitally simulated and presented in this paper. The integrated system has four key subsystems or components to supply the required electric loads. The first subsystem includes the renewable generation sources from Wind turbines and fuel cell stacks. The second represents the added inverter between the Fuel cell collection DC bus and the point of common coupling PCC with the AC distribution network. The third device is the static synchronous compensator STATCOM to provide the required reactive power for voltage regulation at the bus of PCC. The fourth subsystem comprises mainly of two PI controllers. The first controller main function is to regulate the hydrogen flow to the fuel cell, while the second one is used to control the switching action of the STATCOM converter for injecting the required reactive power. The integrated system and the associated subsystems are fully validated for efficient operation under normal or fault conditions using the Matlab/Simulink/SimPower software environment.

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“…This reactive power transfer is done by adjusting the secondary transformer voltage to be in phase with the primary voltage (network side). This voltage is provided by a voltage-source PWM inverter and is always in quadrature to the STATCOM current [3,[7][8][9]. The instantaneous power at the AC-and DC-terminals of the inverter is equal by neglecting losses of inverter, giving the following power balance equation:…”

Section: Cstatcom Modelmentioning

confidence: 99%

Operation and Protection of Grid Connected Wind Farm

Mahfouz¹,

El-Sayed²

2024

RE&PQJ

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In modern power systems, wind energy shares significant amount in electricity generation. Accordingly, the grid performance could be affected due to the natural behavior of the connected wind farms. The main challenge is to fulfill the voltage ride through (FRT) requirements and fast fault detection as well as reactive power coordination using FACTs devices such as STATCOM. Fulfilling these requirements will minimize the loss of wind energy generation due to emerged disconnection of the wind turbines from the grid. This paper presents fast and efficient over current and under voltage protections against faults on both grid high voltage line and on medium voltage feeders connecting the wind turbines to the point of common coupling (PCC). The proposed protection scheme based on measuring the voltage and current signals at PCC bus, evaluating and analyzing these signals for fault detection. Thereby, the main objective is to keep wind turbines connected to the grid and to regulate the reactive power and voltage level during gridtransmission line faults using STATCOM. Under voltage, relay time delay settings is proposed to fulfill the Fault Ride-Through (FRT) requirement. Moreover, over current relay settings is presented to isolate the wind farm from the grid during the internal wind farm feeder faults.

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Feasibility Studies for Dynamic VAR and STATCOM Applications to Prevent a Fast Voltage Collapse

Cited by 7 publications

References 10 publications

Static synchronous compensator sizing for enhancement of fault ride‐through capability and voltage stabilisation of fixed speed wind farms

Static synchronous compensator sizing for enhancement of fault ride‐through capability and voltage stabilisation of fixed speed wind farms

Modeling and Reactive Power Control of Wind and Fuel Cell Technologies in Distribution Networks

Operation and Protection of Grid Connected Wind Farm

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