AN ENHANCEMENT OF VOLTAGE PROFILE & TRANSFER CAPABILITY BASED ON THD-D-STATCOM USING DISCRETE PI CONTROLLER
Raj Singh
M.Tech Research Scholar,
Shri Ram Institute of Technology, Jabalpur, (M.P.), India Ankita Kosti
Assistant Professor, Dept. of Electrical Engineering, Shri Ram Institute of Technology, Jabalpur, (M.P.), India
Abstract- In this paper introduce the compensating device i.e. D-STATCOM that typically a controller device employed in the facility distribution system, this paper explore the conception of management flow of reactive power done the system in power distribution system. As realize the inductive load consume additional reactive power resultant load power issue be in decline thanks to this restricted the active power flow in line. the most locution of this paper is implement a voltage supply convertor (VSC) that supported D- STATCOM that’s work as associate widget that inject the facility (reactive) within the distribution line. Management the power unit generation by creating the D-STATCOM output voltage as main leading voltage thereto of system voltage. Simulation and modelling of THD-D-STATCOM mistreatment PI theme has through with the Simulink/MATLAB tool.
Keywords: D-STATCOM, THD, VAR, VSC, PI, IGBT.
1. INTRODUCTION
The FACTS devices provides a fast and reliable management over transmission parameters, like voltage, line physical phenomenon and half angle between the causing finish and receiving finish voltage. On the alternative hand the custom power device is utilized for low voltage distribution and improves the power quality because of that the system becomes reliable. Custom power devices square measure very constant because the FACTS devices. Most wide known custom power devices square measure D- SATCOM, UPQC, DVR among them D- STATCOM is well known because it can provide worth effective resolution for the compensation of reactive power [1].
A FACTS may be an influence electronic based totally device that maintains the power quality by maintaining higher flow of power and controls the dynamic stability of the system by ever-changing the system parameters like voltage, section angle, impedance.
In this paper Distributed Static Compensator (D-STATCOM) is utilized. A D-STATCOM is a VSI fed power electronic device that is connected in shunt to the network to mitigate the harmonics and different power quality problems. The performance of the D-STATCOM depends on wholly totally different management algorithms that square measure used for extraction of reference currents and to
produce pulses to the gate terminals of the VSI. A literature review has been performed on differing types of studies over D-STATCOM [2].
The D-STATCOM is extraordinarily effective in providing load voltage regulation; however, maintaining load voltage at rated price has several unwanted effects from shopper purpose of read. With voltage of 1p.u. at load purpose, D- STATCOM forces load to regulate unceasingly at rated power [3].
The STATCOM utilized in distribution systems is called D-STATCOM (Distribution-STATCOM). it'll exchange every active and reactive power with the distribution system by variable the amplitude and section of the device voltage with relevance the road terminal voltage [4].
2. SIMULINK DESIGN AND RESULTS A Schematic presentation in figure-1 i.e.
D-STATCOM, consists of a two-level Voltage offer converter (VSC), a dc energy storage device, a coupling device connected in shunt to the distribution network through a coupling device. The VSC converts the dc voltage across the device into a bunch of three-phase ac output voltages. These voltages ar in section and paired with the ac system through the physical phenomenon of the coupling device. acceptable adjustment of the section and magnitude of the D-
STATCOM output voltages permits effective management of active and reactive power exchanges between the D- STATCOM and the ac system. Such configuration permits the device to soak up or generate manageable active and reactive power.
The VSC connected in shunt with the ac system provides a multifunctional topology which will be used for three quite distinct purposes: one. Voltage regulation and compensation of reactive power; a try
of. Correction of power factor; 3.
Elimination of current harmonics. Here, such device is employed to supply continuous voltage regulation victimization associate degree indirectly controlled converter. As shown in Fig-l the shunt injected current Ish corrects the voltage sag by adjusting the voltage drop across the system physical phenomenon Zth. the value of Ish are going to be controlled by adjusting the output voltage of the converter [4].
Figure 1: Simulink Model D-STATCOM with RL Load
Figure 2: Output waveform Current and Voltage with parametric line flow
As depicted figure shows the output wave current and voltage with RL load without D-STATCOM and Output waveform voltage and current with RL load with D- STATCOM respectively. It is very clear from the output results waveform (voltage and current) shows less harmonic and better stability with RL load using D- STATCOM system as compare to the without D-STATCOM system module.
Figure 3: Currents (Ia, Ib& Ic) Outputs of Inverter side when D-STATCOM
Present
As above depicted figure shows that the individual current outputs of inverter side when D-STATCOM connected, it is clear from the waveform of output current show variation at starting magnitude of current and for 0.834 sec it become zero.
Figure 4: Voltages (Va, Vb& Vc) and Combined (Vabc & Iabc) Outputs of
Inverter side when D-STATCOM Present Due to sine triangular PWM, which is given to gate of IGBTs, the inverter side wave forms are sine in shape. Figure 4 shows the inverter side outputs, when D- STATCOM is connected.
Figure 5: Available Transfer Capability (ATC) Variation in D-STATCOM Current
for Transaction T-1, T-2 and T-3 As depicted figures shows the available transfer capability variation in D- STATCOM current for transaction T-1, it is very clear from the result waveform has smoother, linear means to clear or eliminates distortion (i.e. harmonics) and fluctuation. it is understood that the sending end reactive power gets reduced, while the D-STATCOM is introduced for the same load reactive power. So, the power transfer capability of the system gets increased, when D-STATCOM is connected.ATC variation in D-STATCOM voltage for transaction T-2 and ATC variation in D-STATCOM voltage for transaction T-3 respectively. It is understood that the sending end reactive power gets reduced, while the D- STATCOM is introduced for the same load reactive power. So, the power transfer capability of the system gets increased, when D-STATCOM is connected.
Figure 6: Grid Active and Reactive Power
Figure 7: Active and reactive power values
In the above figure 7 as well as 8 (a, b) discussed the active and reactive power of proposed system. The parameters value obtain from this analysis shown in the above figure (a) as well as (b). In the below table 4.2 discuss the different result parameters comparison such as active power, reactive power, total harmonic distortion. In the below table clear shows that THD of proposed design method shows better result as compare to without filter that 1.38. The THD value shown in the below figure 8.
(a) THD value outcome in Graphical value
(b) Shows the THD value and THD graphical Value
Figure 8: THD analysis presented
In the both above figure shows the THD value as well as its graphical representation. Clear shows that the THD value of the proposed system 1.38%.
Table 1: With Filter and Without Filter Result Parameter Comparison
In the above table discuss the result outcomes of proposed method in both form tabular form of presented work. In the above comparison clearly shows that the with double filter proposed method shows better result and low losses as compare to without filter method that is previously represented .
3. CONCLUSION
In this paper we've studied and mentioned regarding the custom power device i.e. D-STATCOM that operates on low voltage and but it is useful in compensation of reactive power as it injects the reactive power in the line. The device is actually acts as VSC that's been implemented at the load aspect of the system so as to improve the voltage profile of system and cut back the flexibility losses. Hence, D-STATCOM improves the voltage stability of system.
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