Comparing the efficiency of dstatcom to improve the quality of distribution network power in the presence of wind turbine sources

摘要

During the last decades, the installed wind turbines in wind farms have not been high-tech. Today, the use of windturbines to produce electricity has grown dramatically in the world. FACTS devices in wind turbine systems are used toimprove the dynamic and transient stability of the power system. DSTATCOM is a FACTS device that can be used effectivelyto provide transient voltages to prevent system collapse in wind farms. Due to the existence of sensitive and diverse loads ofdistribution networks, the improvement of power quality has been found to be of particular importance in the systems ofdistribution. Power quality problems include drops, transient interruptions and other sinusoidal waveform distortions, so thereare several strategies to improve the quality of the power and one of them is the use of power electronics technology.Distribution networks have high power losses and high voltage drop due to low voltage level and consequently a high current.Recently, DFACTS devices such as DSTATCOM have also been highly regarded for this purpose that is loss and unbalancedlosses and load losses, and voltage improvements. The DSTATCOM compensator is one of the parallel compensators able toinject active and reactive power fast and fully integrated into the network. Improving the performance of DSTATCOM canimprove the quality of power quality. This research has investigated the properties of 2 low-frequency parallel elements ofFACTS and it was shown that DSTATCOM is so effective in raising the system performance in a situation where the systemhas a very high voltage drop. Also, the fast response time of the DSTATCOM controller has made it superior to SVC.Consequently, the location of the failure in non-FACTS mode is effective on the transient network stability in the state of thethree-phase error to ground and the proximity of the fault to the turbine site causes loss of synchronization and the operation ofthe protection system. However, installing FACTS devices reduces the sensitivity of the system’s resistance to the location ofthe error. In DSTATCOM mode, these fluctuations are not seen, because the DSTATCOM structure leads to this fact that thepower doesn’t have many changes and it almost passes the fault through a flat line, for SVC mode, this is the same asDSTATCOM.