INTERLINE DYNAMIC VOLTAGE RESTORER PDF
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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To overcome this limitation, a new idea is presented in this paper which allows to reduce the load power factor under sag condition, and therefore, the compensation capacity is increased.
Journal of Engineering Research and Technology
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 experimental test results match those proposed using simulation, although some discrepancies due to the imperfect nature of the test circuit components were seen.
Simulation and experimental results elucidate and substantiate the proposed concept. 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. The compensation was eventually forced to stop before the entire voltage sag period was finished. In this paper, an enhanced sag compensation strategy is proposed that mitigates the phase jump in the load voltage while improving the overall sag compensation time.
To illustrate the effectiveness of the proposed method an analytical comparison is carried out with the existing phase jump compensation schemes.
While one of the DVRs compensates for the local voltage sag in its feeder, the other DVRs replenish the common dc-link voltage. 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 existing installed DVRs.
The proposed strategy improves the voltage quality of sensitive loads by protecting them against the grid voltage sags involving the phase jump. IDVR compensation capacity, however, depends greatly on the load power factor and a higher load power factor causes lower performance of IDVR. The main conclusions of this work can be summarized as follows: The proposed concept has been supported with simulation and experimental results.
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. When the compensation was conducted using the proposed technique, less energy was used for the converter basic switching process.
This enhancement can also be seen as a considerable reduction in dc link capacitor size for new installation. It is clear from both the simulation and experimental results illustrated in this paper that the proposed zero-real power tracking technique applied to DVR-based compensation can result in superior performance compared to the traditional in-phase technique.
With the traditional in-phase technique, the reztorer was performed and depended on the real power injected to the system. The main conclusions of this work can be summarized as follows:.
DF improvement can be achieved via active and reactive power exchange PQ sharing between different feeders. This study aims to enhance the abilities of DVRs to maintain acceptable voltages and last longer during compensation.
Single line diagram of an IPFC in transmission system. 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. Per-phase simulation results for voltage sag condition at: Further extension in compensation time can be achieved for intermediate sag depths.
Strathprints home Open Access Login. 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. The performance of proposed method is evaluated using simulation study.
Interline dynamic voltage restorer (IDVR) Archives – ASOKA TECHNOLOGIES
Both the magnitude and phase displacement angle of the synthesized DVR voltage are precisely adjusted to achieve lower power utilization. Investigating the IDVR performance when the proposed method is applied for a sag with depth of 0. 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.
The overall three-phase voltage signals during in-phase compensation simulation. In this technique, the source voltages are sensed continuously and when the voltage sag is detected, the dynajic reactances are switched into the circuit and decrease the load power factors to improve IDVR performance.
In this case, the DF of the sourcing feeder will have a notable improvement with only a slight variation in DF of the receiving feeder. Then, restirer of the energy stored in the DC-link capacitor was utilized quickly, reaching its limitation within a shorter period. This paper presents a utilization technique for enhancing the capabilities of dynamic voltage restorers DVRs.
The overall three-phase voltage signals during zero-real power tracking compensation simulation. 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. The experimental results demonstrate the feasibility of the proposed phase jump compensation method for practical applications.
Finally, the simulation and practical results on the CHB based IDVR confirmed the effectiveness of the proposed configuration and control scheme. Per-phase PQ sharing mode simulation results: This paper proposes a new operational mode for the IDVR to improve the DF of different feeders under normal operation.
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