Then a new device which is named Inter-line Dynamic Voltage Restorer (IDVR) is discussed. This device consists of two conventional DVRs which are installed. An interline dynamic voltage restorer (IDVR) is a novel c o m p e n s a t i o n piece of mitigation It is made of several dynamic voltage restorers (DVRs) with a. Index Terms—Dynamic voltage restorer, Interline dynamic voltage restorer, Current source inverter, SMES and Power quality.
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This technical merit demonstrates that DVRs could cover a wider range of voltage sags; the practicality of this idea for better utilization is better than that of restorwr installed DVRs. The results from both the simulation retorer experimental tests illustrate that the proposed technique clearly achieved superior performance.
Winter Meetingvol. DF improvement can be achieved via active and reactive power exchange PQ sharing between different feeders. The proposed concept has been supported with simulation and experimental results. This enhancement can also be seen as a considerable reduction in dc link capacitor size for new installation. Mathematical analysis is carried out for each individual component of the IDVR as modular models, which are then aggregated to generate the final model.
The existing control strategies either mitigate the phase jump or improve the utilization of dc link energy by i reducing the amplitude of injected voltage, or ii optimizing the dc bus energy support.
For normal voltage levels, the DVRs should be bypassed. Then, experimental results on a scaled-down IDVR are presented to confirm the theoretical and simulation results. The DF of the sourcing feeder increases while the DF of the receiving feeder decreases. In this case, the DF of the sourcing feeder will have a notable improvement with only a slight variation in Interllne of the receiving feeder.
The compensation was eventually forced to stop before the entire voltage sag period was finished. Per-phase experimental and corresponding simulation results for DF improvement case: Investigating the IDVR performance when the proposed method is applied for a sag with depth of 0.
When the compensation was conducted using the proposed technique, less energy was used for the converter restprer switching process.
The higher active power requirement associated with voltage phase jump compensation has caused a substantial rise in size and cost of dc link energy storage system of DVR.
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Instead of bypassing the DVRs in normal conditions, this paper proposes operating the DVRs, if needed, to improve the displacement factor DF of one of the involved feeders.
In this paper, a new configuration has been proposed which not only improves the compensation capacity reetorer the IDVR at high power factors, but also increases the performance of the compensator to mitigate deep sags at fairly moderate power factors.
To illustrate the effectiveness of the proposed method an analytical comparison is carried out with the existing phase jump compensation schemes.
An IDVR merely consists of several dynamic voltage restorers DVRs sharing a common dc link connecting independent feeders to secure electric power to critical loads. Strathprints home Open Access Login. These advantages were achieved by decreasing the load power factor during sag condition.
Votage proposed strategy improves the voltage quality of sensitive loads by protecting them against the grid voltage sags involving the phase jump.
The experimental results demonstrate the feasibility of the proposed phase jump compensation method for practical applications. In this technique, the source voltages are sensed continuously and when the voltage sag is detected, the shunt reactances are switched into the circuit and decrease the load power factors to improve IDVR performance.
While one of the DVRs compensates for the local voltage sag in its feeder, the other DVRs replenish the common dc-link voltage.
Journal of Engineering Research and Technology
The main conclusions of this work can be summarized as follows:. This study aims to enhance the abilities of DVRs to maintain acceptable voltages and last longer during compensation. These operational constraints have been identified and considered.
A method for building a dynamic phasor model of an Interline Dynamic Voltage Restorer IDVR is presented, and the resulting model is tested in a simple radial distribution system.
Interline dynamic voltage restorer (IDVR) Archives – ASOKA TECHNOLOGIES
With the traditional in-phase technique, the compensation was performed and depended on the real power injected to the system.
An interline dynamic voltage restorer IDVR is a new device for sag mitigation which is made of several dynamic voltage restorers DVRs with a common DC link, where each DVR is connected in series with a distribution feeder.
Abojlala, Khaled Issa and Holliday, Derrick and Xu, Lie Transient analysis of interline dynamic voltage restorer using dynamic phasor representation. The performance of proposed method is evaluated using simulation study.
The ensure compatibility with transient stability programs, the analysis is performed for the fundamental frequency only, with other frequency components being truncated and without considering harmonics. Finally, the simulation and practical results on the CHB based IDVR confirmed the effectiveness of the proposed configuration and control scheme.
In this mode, theDFof one of the feeders is improved via active and reactive power exchange PQ sharing between feeders through the common dc link. It also increases compensation time by operating in minimum active power mode through a controlled transition once the phase jump is compensated. Both the magnitude and phase displacement angle of the synthesized DVR voltage are precisely adjusted to achieve lower power utilization.
Per-phase simulation results for voltage sag condition at: The proposed technique has the advantage of simplifying the modelling of any flexible AC transmission system FACTS device in dynamic phasor mode when compared to other modelling techniques reported in the literature.