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Static var compensator (SVC) and thyristor controlled series compensator (TCSC) are used to improve Transient Voltage Stability of the asynchronous wind farm in this paper. The related structure model of the wind farm power system is built in Matlab / Simulink. The contributions of SVC and TCSC to Transient Voltage Stability of the asynchronous wind farm and power grid are verified by the simulation...
In this paper, a new control strategy is proposed to improve the performance of a wind generator system composed of a three-phase PMSG and a Back-to-Back three-phase to single phase converter. With the use of the large inductance of the synchronous generator, the control method minimizes the generator torque ripple when the system supplies a single-phase load. The problem arises from the fact that...
This paper proposed a new control approach for power quality compensation using Unified Power Quality Conditioner (UPQC). This approach has capability of power flow control as well as power quality compensation, too. In the UPQC control, Series Active Filter (SAF) is controlled by dqo approach for voltage sag, swell, unbalance, interruption and harmonic compensation. Also, Parallel Active Filter (PAF)...
With the introduction of new guidelines regarding the connection of large wind farms to the grid, wind farms and equipment providers are facing with new opportunities and challenges. One of which is low voltage ride-through (LVRT). Despite of the new installations, there are a considerable number of wind turbines to be reformed to meet the requirements. In this paper, a brief explanation of the principle...
When grid voltage is nonsinusoidal, the detection current based on the instantaneous reactive power theory has error. After analyzing the current detection error, a improved n current detection algorithm based on the instantaneous reactive power theory is proposed. The detection current is accurate by the improved current detection algorithm, and the complexity of the algorithm is no significant increase.
In this paper a new method has been proposed to decide optimal placement and best sizing of static synchronous compensator (STATCOM). Seeking the best place is performed using the sensitivity analysis and sizing of STATCOM is managed using the genetic algorithm. The average model can account for the high-frequency effects and power electronic losses, and more accurately predict the active and reactive...
This paper presents the possible improvements of voltage quality in connection of a wind farm to transmission network using VSC-HVDC (Voltage source converter high voltage direct current) link. For a 80 MW wind farm consisting of 40 individual 2 MW doubly fed induction generators, the main influence of voltage fluctuation caused by the wind farm integration is analyzed. The use of a reactive controller...
The fundamental theory and control methods of Active Power Factor Correction (short for APFC) are introduced in this paper. It analyzes and studies the APFC based on the three-phase rectifier. In addition, the simulation model is built on the MATLAB and the results are shown in this paper. The results show that the grids-side input current wave is changed with a sine wave, has the same phase with...
The distribution power sources and loads are integrated by microgrid technology, which could electively relieve the impacts of distribution power sources on large power grid. So, microgrid is an effective way for distribution power sources' large-scale application. There is unavailability of official release on the microgrid standard as yet at home and abroad, and grid-connected standard should be...
The paper researches the impacts on the voltage of distribution network after grid connected of distributed generation mainly. First, the paper establishes the DG, distribution network and load model, proposes the algorithm of the simplified voltage superposition theorem, and confirms the accuracy of this algorithm. Then according to the varieties of capacity and location and power factor of DG, and...
Aiming at regional power grid whose power supply is a substation that connects the upper and lower grid, REI (Radial Equivalent Independent) equivalent is applied to voltage and reactive power optimization control, and varying-intercept linear regression method is proposed to obtain equivalent parameters according to local data taking into account the difficulty of getting the upper grid operating...
Wind generation rapid development has brought challenge to the grid. Reactive voltage is the most outstanding and one of the most concerned problems. This paper introduces the concept of wind farms reactive power compensation and wind power grid code with respect to reactive power regulation all over the world, gives the simplified approach to estimate reactive power compensation capacity, and validates...
In accordance with the randomness and intermittent characteristics of wind power, the static synchronous compensator (STATCOM) is more competent and competitive for reactive power compensation in large scale wind farm. An average state model for the VSC-STATCOM is derived, according to the wind farm reactive power compensation characteristics, a novel decoupling control strategy of active power and...
A comprehensive optimal regulation model for distribution networks is presented, which utilizes the reactive power regulating means, sectionalizing and tie switchers to reduce active power losses. A loop-based coding scheme is proposed for reconfiguration description. The reactive tabu search algorithm is employed to get the optimal solution. The efficiency of the proposed method is identified by...
This paper presents a procedure for allocating reactive power using artificial neural network (ANN). Artificial neural network is trained based on data from Y-bus matrix. Training and testing of this ANN network have been done with five bus test system. Back propagation learning has been utilized to train the ANN. A numerical example on allocating reactive power using a feed forward back propagation...
Apply sequential quadratic programming algorithm into large power system's reactive voltage optimization and introduce exact penalty function as algorithm improvement. Use improved global sequential quadratic programming algorithm to do the reactive power optimization algorithm to IEEE 30-bus system and IEEE 118-bus system. The result shows that the global sequential quadratic programming algorithm,...
This article uses IES electromagnetic field calculation software to simulate the internal electric field distribution of shunt capacitors, and discusses a variety of electrode on the capacitor. Simulation results show that folding prominent forms of capacitor electrode has the best performance of partial discharge. On this basis, the paper also discusses the internal capacitor plate structure parameters"...
An accurate model of large scale wind farm is demanded for researches about the impacts on the power grid. The total number of wind energy generators is so large that the detailed model of wind farm is computationally prohibitive. Dynamic equivalence can significantly reduce system order with the major characteristics retained. So the aggregation of large scale wind farm is inevitable. An overview...
The efficiency of capacitor charging power supply (CCPS) is an important index. Improving the efficiency is not only the demand for efficient using of power energy, but also the necessity for ensuring the charging rate, device safety and electromagnetic compatibility. The power loss of inverter, LC resonance, voltage rising and harmonic distortion are the main influence factors. So the measures of...
The high power self-commutated VSC are the key control devices in HVDC, FACTS and DFACTS systems. The self-commutated voltage source converter back to back (VSC BTB) link connects two ac power systems asynchronously, can control the active power exchanged between the two ac system and the reactive powers at the both terminals independently. To achieve the expected control objectives suitable control...
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