Harmonic Compensation by PV-STATCOM

Modelling of the series transformer, VSC and LC filter is presented in this section. A time-varying threephase

It is observed that the power factor is maintained closer to unity when the input voltage is reduced from 230V to 110Vrms. Figure 11 (a) and (b) shows the power factor correction of controller for various load condition such as 20% (60W) and 75% (230W). The power factor for the system is found to be 0.84 for light load condition and 0.99 for full load condition. The THD of input current at full load with predominant third and fifth harmonic components are shown in Figure 12(a) and (b).Third harmonics is found to be 4.8% and fifth harmonic component is 4.9% which are well within IEC 61000-3-2 standard during wide range of load variations. The variation in power factor with load is shown graphically in Figure 13(a). It can be inferred from the graph that improved resettable control operates at high power factor for all load condition whereas the conventional PI control has poor power factor under light load conditions. Figure 13(b) shows the comparison between the efficiency of the converter for varying load conditions with the conventional control method and the resettable integrator control. The converter’s efficiency is maintained at 92% for light load conditions and 96% for fully loaded condition with integrator control technique. Thus the improved resettable integrator controller provides a very simple and reliable solution for power factor correction and

The impact of the proposed sequences has been simulated for 0.4 modulation index with a 0.5 lagging power factor load (power factor angle 60°). The simulation setup consists of the following software: 1) MATLAB/Simulink – used to implement the modulation strategies and switching sequences, and 2) PSIM – used to simulate the T-NPC inverter running with an R-L load and to provide conduction and switching losses of each switch. The inverter switching pulses were generated within Simulink and were fed to PSIM through sim-coupler module which provides a link between PSIM and simulink for the purpose of co-simulation [29].

studied by the Electric Power Research Institute, the federal national labs, and others, with some

Easun Reyrolle, India is a leader in the field of electrical power management, a vibrant and growing industry. This is the parent company of the ERL group, which consists of ERL International Pte. Ltd: Singapore, ERL Marketing International FZE: Sharjah, ERL Phase Power Technologies Ltd: Canada, ERL Switchcraft Europe GmbH: Germany and ERL Electrical Distribution Solutions Pt Ltd: Australia. Executed by Easun Reyrolle Ltd to suffice the Energy Meter requirements of different electricity boards in India.

Measuring the power quality it requires the network system voltage within their limits, as the non linear loads increasing .Effects of Harmonic on power quality and the efficiency. In power system , harmonics are the multiples frequencies . when we apply pure sinusoidal wave form of

The principle operation of these 3-Phase Induction Motor is related to the Faraday’s Law and Lorentz force on a conductor. Faradays

Balancing load of distribution feeders is significant for falling of power loss and mitigating power flow. As the loop power controller is implanting for the active power and reactive power flows by change in voltage ratio and phase shift. So that the balancing of the load distribution feeders can be achieved. However it can include photovoltaic power producing in feeder balancing load, as a Taipower distribution feeder consisting of two feeders with large amount of photovoltaic equipment considered. The balancing load can be determine in distribution feeders with photovoltaic set up by using the loop power controllers as the changing of solar energy and power loading of feeders. With implanting the control algorithm in MATLAB for loop power controller by changing the voltage ratio and phase shift connecting to the feeder the proper amount of active power and

Referring to Fig. 1(ii), consider in region II, the reference voltage vector is following the arc x1x2 at a particular modulation index m. The position of the reference voltage vector is shown in Table 1. It shows that, depending on modulation index value, the duration of stay within subsector 1 and subsector 2 changes. Similarly, consider in region III, the reference voltage vector is following the arc y1y2 at aparticular modulation index. The position of the reference voltage vector is shown in Table 1 and it shows that depending on the modulation index value, the duration of stay within subsector 2,3 and 4 changes.

As per references [2], [6], [7], [9] any device with nonlinear characteristics which derive their input power from a sinusoidal electrical system may be responsible for injecting harmonic currents & voltages into the electrical system [2, 6, 7, 9 ]. Francisco C. De la rossa [2] have described ,all possible nonlinear loads . Among them few are Power converters such as Variable frequency drives, DC motor controllers, Cycloconverter, Cranes, Elevators ,Steel mills, Power supplies, UPS,Battery chargers, Inverters & ARC devices such as Fluorescent lighting, ARC furnaces, Welding machines. According to authors [2] ,[7] Even linear loads like power transformers can act nonlinear under saturation conditions. This occurs beyond the so-called saturation knee of the magnetizing curve of the transformer. [2],[7].

The three-phase unbalanced distorted source voltages consisting of the negative-sequence component and harmonic voltage components are expressed in (23).

Each of these devices will respond accordingly to the setpoint given and as soon as the given command from

This result has been obtained for the multi-cell inverter in a seven-level configuration, which uses three series-connected cells in each phase. The smallest distortion is obtained when the carriers are shifted by an angle of 120°.

Generation of electrical power in low voltage level is very much cost effective. Hence electrical power is generated in low voltage level. Theoretically, this low voltage level power can be transmitted to the receiving end. But if the voltage level of a power is increased, the current of the power is reduced which causes reduction in ohmic or I2R losses in the system, reduction in cross sectional area of the conductor i.e. reduction in capital cost of the system and it also improves the voltage regulation of the system. Because of these, low level power must be stepped up for efficient electrical power transmission. This is done by step up transformer at the sending side of the power system network. As this high voltage power may not be distributed to the consumers directly, this must be stepped down to the desired level at the receiving end with the help of step down transformer. These are the uses of electrical power

times one or two phases may not be live in three phase supply. Because of this, many times, some