PERFORMANCE OF DVR AND IDVR FOR VOLTAGE ...Power Quality Improvement Using Multi -Level Inverter...

PERFORMANCE OF DVR AND IDVR FOR VOLTAGE SAG COMPENSATION IN POWER DISTRIBUTION NETWORK

Mr.P.Suresh1, Ms.G.Ramya2, Ms.K.Vijayalakshmi3,K.Surendhira Babu4 and

Ms.S.Nithya5 1Assistant Professor, Department of Electrical & Electronics Engineering,

St Joseph college of Engineering, Chennai, INDIA 2345

Assistant Professor, Department of Electrical & Electronics Engineering, SRMIST, Ramapuram, Chennai, INDIA

Abstract: This paper deals with performance of DVR and IDVR for voltage sag compensation in power distribution network. Investigations were carried out to find the improvement of real,reactive power and THD by employing DVR and IDVR during an abnormal condition in simple two bus power distributed network. It also discusses fourteen bus Multibus system with and without IDVR for different bus location are performed and the results are compared. The comparison parameter such as voltage, real power & reactive power of IDVR involving different bus location in fourteen bus system are simulated and compared using MATLAB/SIMULINK. Key Words: Dynamic Voltage Restorer, Interline Dynamic Voltage Restorer, Voltage Sag and Multibus system.

1. Introduction

Nowadays, power electronics plays a vital role in transmission lines and industries. Because of the very sensitive and less tolerant equipment are used. Therefore for a short time, voltage sag occurs in these places. Voltage sag is created by connecting an additional load in parallel with the exiting load. Among the several novels, the dynamically voltage restorer is one of the power electronics devices which is technically advanced over economical for voltage sag mitigation in distribution system. Performance Evaluation of Custom Power Devices to Mitigate Voltage Sag in Power Distribution Network [1]. Voltage Sag Compensation in Multiline Distribution System using Closed Loop Controlled IDVR [2]. Power Quality Improvement Using Multi-Level Inverter Based DVR and DSTATCOM Using Neuro-Fuzzy Controller. [3] Power Quality Improvement of Nine Bus System during Line Interruption Using IVDFC [4]. The above discussion does not deal with

International Journal of Pure and Applied MathematicsVolume 119 No. 16 2018, 4225-4239ISSN: 1314-3395 (on-line version)url: http://www.acadpubl.eu/hub/Special Issue http://www.acadpubl.eu/hub/

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comparison of DVR and IDVR, and also does not compare the IDVR perform the different bus location in fourteen bus system.

The objective of the proposed system is to compare the

performance of DVR and IDVR for voltage sag compensation in power distributed network in terms of voltage, real, reactive power and THD. The organization of the paper is as follows: Section II deals with configuration of DVR and IDVR. Section III provides the simulation results and discussion. Section IV shows the conclusion of this paper.

2. Configuration of DVR and IDVR

DVR is a series static compensator. The general structure of a DVR consists of a booster transformer, a harmonic filter, a voltage source converter (VSC), a energy storage and a control system. Main functions of DVR include voltage regulation in steady state operation and voltage restoration in transient operation. In either operating modes, DVR injects a dynamically controlled voltage in series to the bus voltage by means of a booster transformer for voltage restoration and regulation. The amplitude of the injected phase voltage is controlled such as to eliminate any detrimental effects of power quality disturbance to the voltage of a certain location on the network.

Figure 1. Block Diagram of Dynamic Voltage Restorer

The Interline IDVR proposed in this paper provides a way to replenish the energy in the common dc link energy storage. For protecting several sensitive loads in different distribution feeders emanating from different grid substations. Then it consists of several DVRs and all that DVRs are connected to a common dc link. The control system of DVR plays a important role for the requirement of fast response in the control of voltage sags and variation of connected loads. In these controller is used to control

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the DVR. The novel minimal energy consumption strategy for the DVR is proposed in two different voltage distribution system is protected using two DVR’s. The first is a low voltage DVR operating in voltage sag mitigation mode injecting active power from the DC link capacitor. In that time other medium voltage DVR keeps the voltage of the Dc link capacitor constant the optimum rating for two DVR’s when used for IDVR system is designed.

Figure 2. Block Diagram of Interline Dynamic Voltage Restorer

.

3.Performance of DVR and IDVR in Two Bus System

The Single line model of 2 bus systems with DVR is shown in figure 3. The output voltage of two bus system with DVR is shown in figure 4 and the peak value of voltage is 3300volts. The power measurement block is connected in load 1 to measure real power and reactive power. The simulation output of Real & Reactive powers are shown in Figure 5 and value of real power is 0.056MW and reactive power is 0.041MVAR. The frequency spectrum is shown in Figure 6.and its THD value 6.27%


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Figure 3. Single line diagram of two bus system with DVR

Figure 4.Simulation Output Voltage of Two Bus System with DVR

Figure 5.Simulation output of Real and Reactive Powers


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Figure 6.Frequency Spectrum of DVR

The Single line diagram of two line system with IDVR is shown in the Figure 7.The AC output voltage of the CT is rectified using a controlled rectifier. The DC is converted into AC using a PWM inverter, and the output voltage of the inverter is injected using a transformer. The output voltage of two line system with IDVR is shown in figure 8 and the peak value of voltage is 4050 volts. The simulation output of Real & Reactive powers are shown in Figure 9 and value of real power is 0.081MW and reactive power is 0.066MVAR. The frequency spectrum is shown in Figure 6.and its THD value 4.48%. The summary of output voltage, real, reactive power and THD in DVR and IDVR are given in table 1. It can be seen THD is reduced to 1.79%

Figure 7.Single Line Diagram of Interline Dynamic Voltage Restorer


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Figure 8.Simulation Output Voltage Waveform of IDVR

Figure 9.Simulation Output of Real and Reactive Powers with IDVR

Fig 10.Frequency Spectrum of IDVR


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Chart 1.Comparison of DVR and IDVR in terms of Voltage, Real power,

Reactive power and THD

4.Fourteen Bus Systems With and Without IDVR in Different Location

The Single line diagram of fourteen bus system without IDVR in

power distributed network is shown in the Figure 11. The simulation output voltage of fourteen bus system without IDVR in different bus location in figure 12, figure 14 and figure 16 and the peak value of voltage is 2350V, 3400V and 3670 V respectively. The simulation output of Real & Reactive powers of fourteen bus system without IDVR are shown in Figure 13,Figure 15 and Figure 17 and value of real power is 0.0841MW, 0.445MW and


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1.302MW respectively and reactive power is 0.665MVAR , 0.349MVAR and 1.091MVAR respectively.

Figure 11.Single line diagram of fourteen bus power distributed system.

Figure 12.Simulation Output Voltage of 14 Bus system at Bus No 10

Figure 13. Simulation output of real and reactive powers at bus no 10


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Figure 14.Simulation Output Voltage of Bus No 4

Figure 15. Simulation Output of Real and Reactive Powers at Bus No 4

Figure 16.Simulation Output Voltage of Bus No 13


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Figure 17. Simulation Output of Real and Reactive Powers at Bus No 13

The Single line diagram of fourteen bus system with IDVR in power distributed network is shown in the Figure 18. The simulation output voltage of fourteen bus system with IDVR in different bus location in figure 19, figure 21 and figure 23 and the peak value of voltage is 3560V, 3200V and 4100V respectively. The simulation output of Real & Reactive powers of fourteen bus system with IDVR are shown in Figure 20, Figure 22 and Figure 24 and value of real power is 0.984MW, 0.716MW and 1.531MW respectively and reactive power is 0.753MVAR, 0.564MVAR and 1.42MVAR respectively.

Figure 18.Single line diagram of fourteen bus power distributed system with IDVR in different location


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Figure 19.Simulation Output Voltage of 14 Bus System with IDVR at Bus

No 10

Figure 20. Simulation Output of Real and Reactive Powers of 14 Bus

System with IDVR at Bus No 10


No 4


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Figure 22. Simulation output of real and reactive powers of 14 bus system with IDVR at bus no 4


No 13

Figure 24. Simulation output of real and reactive powers of 14 bus system

with IDVR at bus no 13

The summary of output voltage, real and reactive powers in fourteen bus system with and without IDVR are shown in table 2 .comparison chart of output voltage ,real and reactive powers in bus no 13, 10 ,4 is shown chart 2, 3and 4. It can be seen idvr better performance to compensate the voltage sag in terms of output voltage real and reactive power.


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Chart 2.Comparision of Output Voltage of Without IDVR and With IDVR at Different Buses

Chart 3.Comparision of Real Powers without IDVR and with IDVR at

Different Buses

Chart 4.Comparision of Reactive Powers without IDVR and with IDVR at

Different Buses

Conclusion

The performance of DVR and IDVR for voltage sag compensation in

power distribution network was discussed in this paper. The simulation results of

the DVR and IDVR is compared. The result shows IDVR is more efficient

than DVR. Multibus system with and without IDVR for different bus location

is performed and the results are compared. This results indicates that IDVR

is better improvement in voltage, real power & reactive power.


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The modelling & simulation is done in the single phase IDVR system.

The three phase circuit modelling and simulation can be made in future

References

1. Ramya, G., V. Ganapathy, and P. Suresh. "Power quality improvement using

multi-level inverter based DVR and DSTATCOM using neuro-fuzzy controller." International journal of power electronics and drive systems (IJPEDS) 8, no. 1 (2017): 316-324.

2. Suresh, P., and B. Baskaran. "Voltage sag compensation in multiline

distribution system using closed loop controlled IDVR." International Journal of Applied Engineering Research12, no. 8 (2017): 1576-83.

3. Suresh, P., and B. Baskaran. "Power quality improvement of nine bus system

during line interruption using IVDFC." International Journal of Applied Engineering Research 12, no. 10 (2017): 2527-37.

4. Suresh, P., B. Baskaran, and G. Ramya. "Fuzzy Logic Controller Based IDVR

in IEEE 30 Bus System for Voltage Sag Compensation." Indian Journal of Science and Technology 10, no. 29 (2017).

5. Suresh, P., and B. Baskaran. "Reduction of Line Losses by using Interline Dynamic Voltage Restorer." International Journal of Control Theory and Apllication 9, no. 25 (2016): 417-422.

6. Suresh, P., and B. Baskaran. "Voltage Sag Compensation in Fourteen Bus System during Line Interruption Using Interline Dynamic Voltage Restorer." Indonesian Journal of Electrical Engineering and Computer Science 7, no. 3 (2017): 655-667.

7. Ramya, G., and V. Ganapathy. "Comparison of Five Level and Seven Level

Inverter Based Static Compensator System." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 3 (2016): 706-713.


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PERFORMANCE OF DVR AND IDVR FOR VOLTAGE ...Power Quality Improvement Using Multi -Level Inverter...

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