Grid power quality with variable speed wind turbines

Chen, Z.; Spooner, E.

doi:10.1109/60.921466

Cited by 297 publications

(84 citation statements)

References 10 publications

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“…The power quality is an essential customer focused measure and is greatly affected by the operation of a distribution and transmission network. The issue of power quality is of great importance to the wind turbine [2]. There has been an extensive growth and quick development in the exploitation of wind energy in recent years.…”

Section: Imentioning

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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Section: Imentioning

confidence: 99%

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

Musunuru¹

2017

IJRASET

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“…The dynamic mechanical equation for the SRG is given by (3). It is to be noted that the electromagnetic torque emag C comes as a negative quantity, i. e., acting against the rotor mechanical speed.…”

Section: Energy Conversionmentioning

confidence: 99%

A switched reluctance generator behavior under variable speed and variable excitation

Ribeiro¹,

Cabral²,

Fleury³

2024

RE&PQJ

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Abstract. The subject of this paper is the wind powered Switched Reluctance Generator -SRG and its behavior. Simulations and experimental results are presented. It was analyzed the efficiency of SRG under different conditions. Many operational test were conduced to state clearly the behavior of a prototype drove by a half-bridge (HB) converter. Variable excitation voltage and angular speed relationship is clearly established. It shows that the suitable excitation control for a wind powered SRG must adjust the operation parameters to match the desired point on certain surfaces.

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“…However, the generated power from renewable energy source is always fluctuating due to environmental condition. In the same way Wind power injection into an electric grid affects the power quality due to the fluctuation nature of the wind and the comparatively new types of its generators [2]. As the wind power penetration into the grid is increasing quickly, the influence of wind turbines on the power quality is becoming an important issue.…”

Section: Introductionmentioning

confidence: 99%

Comparison of SCIG and DFIG Wind Turbines during Variable Wind Speed

Viswambharan¹

2016

International Journal of Innovative Research in Electrical, Ele

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The Renewable energy sources, which have been expected to be a promising alternative energy source, can bring new challenges when it is connected to the power grid. However, the generated power from renewable energy source is always fluctuating due to environmental condition. In the same way Wind power injection into an electric grid affects the power quality due to the fluctuation nature of the wind and the comparatively new types of its generators. Fixed speed wind turbine equipped with Squirrel cage induction generator has the advantages of being simple, robust and reliable. However, it also contains some disadvantages of uncontrollable reactive power output, mechanical stress and limited power quality control. Owing to its fixed speed operation, fluctuations in wind speed are further transmitted as fluctuations in the mechanical torque and then in the electrical power output. In order to overcome the above mentioned problems associated with fixed-speed wind turbine system and to maximize the wind energy capture, variable speed wind turbines based on Doubly fed induction generator are becoming employed.Keywords: Doubly fed induction generator (DFIG), Flicker, Power quality, Squirrel cage induction generator (SCIG), wind turbine I. INTRODUCTIONWind energy is one of the most cost-effective energy sources to produce electricity among various renewable energy sources. However, the generated power from renewable energy source is always fluctuating due to environmental condition. In the same way Wind power injection into an electric grid affects the power quality due to the fluctuation nature of the wind and the comparatively new types of its generators [2]. As the wind power penetration into the grid is increasing quickly, the influence of wind turbines on the power quality is becoming an important issue. One of the important power quality aspects is flicker. Flicker causes irritation to the consumer at the receiving end and results in a serious limitation for weak networks where the flicker effect can emerge. IEC 61400-21 describes procedures for determining the power quality characteristics of wind turbines. There are numerous of factors that affect flicker emission of grid-connected wind turbines during continuous operation, such as wind characteristics (e.g. mean wind speed, turbulence intensity) and grid conditions (e.g. short circuit capacity, grid impedance angle, load type) [7]. The type of wind turbine also has influence on flicker emission. Fixed-speed wind turbine system use a multistage gearbox and a standard squirrel-cage induction generator (SCIG), directly connected to the grid. The speed is not controllable and variable only over a very narrow range, in which only speeds higher than the synchronous speed are possible for generator operation. The fixed speed concept means that wind speed fluctuations are directly translated into electromechanical torque variations, this causes high mechanical and fatigue stresses on the system (turbine blades, gearbox and generator), and may result in swin...

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Grid power quality with variable speed wind turbines

Cited by 297 publications

References 10 publications

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

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

A switched reluctance generator behavior under variable speed and variable excitation

Comparison of SCIG and DFIG Wind Turbines during Variable Wind Speed

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