Voltage Sag Mitigation Using Dynamic Voltage Restorer

Static VAR compensator- it’s a set of devices to provide fast-acting reactive power on high-voltage electricity X’mission networks. SVCs are part of the FACTS family, regulating voltage, power factor; harmonics & stabilizing the system. SVC has no significant moving parts (except internal switchgear).

The smart distribution transformer and its controllers were evaluated through simulations using PLECS simulation platform. The system specifications used to design the simulation model are given in Table 3.

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

Engine room:-it is specified that batteries cannot be use for large time, thus for this, we have an engine to generate the power supply. They are generally of 885 KVA.

The parameters of this controller (PI- 1) can be decreased during the voltage sag in order to improve the performance of the proposed method.

The transformer can work either way to decrease or increase the voltage. Transformer that increase voltage is called step up transformer, and one that decrease voltage is set down. Transformers only work if alternating current is given to the primary coil. If direct current was supplied, there would be no current in the secondary coil. The transformer has two coil system primary and secondary system. The magnetic force of the first set of wires causes the second set to change the power. The one set is an incoming voltage which is usually thicker and the other one is thinner and will be lower in

The DVR is one of the most common and effective solutions for protecting critical load against voltage sags [10] [11]. The DVR is a power electronic device used to inject three-phase voltages in series and in synchronism with the distribution feeder voltages in order to compensate for voltage sags. Moreover, it can be efficiently used to augment the fault ride through capability in wind applications. Detection time is an important factor in the voltage restitution process. Fast detection

understanding of these occurring problem, only then we can be said to be ready for the electric

Power system is a large electrical network used for generation, transmission and distribution of electrical power. Electrical

Starting from the Generation of the electricity, which is created by many possible processes, the voltage is significantly

The flagship products of A-CAT is a voltage regulator-VR500, it is a protective product that could protect TV’s and refrigerators from the frequent power failures especially in the Vidarbha area. This particular product is relying on a transformer which is provided by mainly four suppliers, Ideal, Dolphin, Boss, and Freedom.

For reliability we have to optimize both power consumption and power supply. Smart grid works on the mechanism of data communication infrastructure. Smart grids has one of the most important feature meter data management system which is designed to collect exchange and process the meter data for optimization of power consumption and supply.

To be able to produce so much current to the whole of country, AC generators are normally used (Horner, Davies & Toerien 2012). A generator is a device that turns mechanical energy into electrical energy (Olivier 2015). A generator is usually either AC( alternating-current) or DC( direct current). An AC basic principle is that the coil rotates mechanically in a uniform magnetic field; this magnetic field then induces an electrical field. Due to a part of the coil always being connected to the same slip ring and brush it can be said that the brush is sometimes negative and sometimes positive (Olivier 2015).

A microgrid is an interconnection of distributed generations (DGs), either a set of dispatchable generating sources such as, gas turbines and fuel cells or non-dispatchable generators such as, wind turbines and photovoltaic sources, integrated with electrical and thermal energy storage devices to meet the customers’ local energy needs, operating as a single system and small-scale, on low-voltage distribution systems providing both power and heat. To ensure that the microgrid is operated as a single aggregated system and meets power quality, reliability and security standards, power electronic interfaces and controls need to be applied [1-2].

Power Supply- The power supply, or Power Supply Unit (PSU), is the component that supplies power to the components of the computer system. It does this by converting the AC current from the mains socket do DC current. The power supply is also capable of regulating the voltage that the computer system receives this helps to avoid any abnormal spikes of high voltage that could damage, or destroy components of the computer. PSU’s are rated by the number of watts that they generate.