A STATCOM-control scheme for wind energy system to improve power quality

Nirmala, N.; Kumar, Virendra

doi:10.1109/icices.2013.6508175

Cited by 10 publications

(2 citation statements)

References 15 publications

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“…is the p.u DC voltages of the DC capacitor. For controlling the proposed STATCOM, modulation index and/or phase angle can be adjusted [11].…”

Section: B Wind Generatormentioning

confidence: 99%

Intelligent Controller Based STATCOM for Improving Dynamic Stability of a Hybrid Power System

Musunuru¹

2017

IJRASET

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Renewable energy sources, which are expected to be a promising alternative energy source, can bring new challenges when connected to the power grid. A large amount of wind turbines are connected to the electrical power system in order to mitigate the negative environmental consequence of conventional electricity generation. While connecting the wind turbine to grid it is important to understand the source of disturbance that affects the power quality. FACTS devices are found to be very effective for stability enhancement followed by a disturbance. Static Synchronous Compensator (STATCOM) which is a shunt device of FACTS family is efficient in regulating voltage either by absorbing or by generating reactive power. STATCOM can provide fast and efficient reactive power support to maintain power system voltage stability. This paper proposes a Hybrid control model for STATCOM that controls the voltage during a disturbance. The proposed controller is implemented to the STATCOM under MATLAB/SIMULINK environment. In the simulation test, the hybrid control shows consistent excellence under a severe disturbance like three phase fault. Keywords: STATCOM, power quality, FACTS, power grid, hybrid controller. I.INTRODUCTION Electric power system is a complex system in its structure and operation is facing many challenges day by day. The major problem in power system is its instability. Power system stability is the capability of the system to maintain an operating equilibrium point after being subjected to a disturbance for given initial operating conditions. Traditionally voltage regulation is performed by the excitation system and thereby help in controlling the system voltage. Suitable devices like Automatic Voltage Regulators (AVR) are used for the regulation of generated voltage. AVR's normally maintain the generator voltage magnitude at a specified level. AVR's are extensively used on the dynamic or steady state stability of the power system as low frequencies oscillations persist for a long period and may affect the capability of power transfer. Electrical power demand is rising at a very higher rate because of rapid industrial development. In order to satisfy the demand, power transmission has to be raised along with the existing facilities. Thus it is essential to concentrate on the power flow control. The power system should be flexible to adapt itself to any momentary changes in system conditions. In an AC power system, there must be a balance between the generated power and variations in load demand while keeping the system frequency and voltage levels as constant. If the generation is not sufficient, the voltage and frequency drop and the load decreases to balance the total generation minus losses in transmission. But there are only a few percent margins for such a self-regulation. Hence the system is collapsed. Generator excitation controller normally improves stability for smaller faults but not suitable for larger faults that occur near to generator terminals. Thus, traditional methods have to be rev...

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“…is the p.u DC voltages of the DC capacitor. For controlling the proposed STATCOM, modulation index and/or phase angle can be adjusted [11].…”

Section: B Wind Generatormentioning

confidence: 99%

Intelligent Controller Based STATCOM for Improving Dynamic Stability of a Hybrid Power System

Musunuru¹

2017

IJRASET

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“…[21] The STATCOM generates an AC voltage, due to which a current of variable magnitude flows at the point of common coupling(PCC) in the transmission system. This current is nearly quadrature with the line voltage, thus at PCC an inductive or a capacitive reactance is connected in the transmission system [6] and provides the required real power and reactive power compensation [8].This method can be used to reduce the power quality issues and improve fault ride-through capability of a wind farm [20] [22]. Controller design for dc-dc converters [23][24][25] Fig.1shows the block diagram of the system with STATCOM circuit which is the 3ɸ inverter and a DC source which is connected with the transmission system wherethe voltage has to be compensated.…”

Section: Introductionmentioning

confidence: 99%

Compensation of voltage Sag using STATCOM

Venkatesan¹,

Nagarajan²

2018

IJET

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Due to unpredicted non-linear loads, power quality problems, a raise in the transmission system. One such problem is voltage sag. Voltage sag is caused by the non-linear load which demands reactive power, but the balanced 3 source provides required reactive power of the load with reduced voltage at the receiving end. In this paper, simulation study has been performed to reducethe voltage sag issue. A transmission system with generation source with different loading conditions is considered and study has been done. A 3 medium  model transmission line is designed with a power source of 11kV. A shunt connected compensation unit called Static Synchronous Compensator (STATCOM) reduces the voltage sag in the transmission line. STATCOM provides the required reactive power demanded by the non-linear load along with the source for compensation of voltage sag. The STATCOM circuit comprises of Voltage source converter(VSC) unit and a DC source. Reactive power compensation is done by VSC unit firing angle control. The source of the STATCOM can also be from renewable energy system. This AC source is converted by a AC-DC-AC converter unit.The firing angle is controlled by the control unit which ensures the continuous and balanced power flow even under sudden change in load conditions. The simulation results depict the characteristics of the developed STATCOM.

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