Grid Tied Res Source Control Technique Essay

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).

So, the above issues can be applied to distributed power systems similarly, and the recent research focuses are summarized as follows:

The grid, which includes transmission and distribution lines, is a critical aspect of the energy industry that has become antiquated in recent years. The first problem is caused by an increasing demand, 2.5% annually over the last 20 years, leaving the grid overused [gungor]. The second problem is the age of the infrastructure the average age of the power-grid transmission lines are 50–60 years [gungor]. Because the increase in demand and age of the infrastructure coupled with the nonlinear nature of the electric power distribution network have caused serious network congestion issues, which has caused several major blackouts [gungor]. In addition to network congestion, the existing power grid also is out-of-date in the following areas: communications, monitoring, fault diagnostics and automation which further increase the possibility of region-wide system blackout [gungor]. All the aforementioned problems of the “traditional” grid have been increasingly more difficult to meet in the 21st centuries demands, including power-grid integration, system stability and energy storage and an overall decrease in reliability [erol,gungor].

There two ways to stabilize power supply, first approach is a Corrective approach, where new power stations are built, existing infrastructures are upgraded and new maintenance plans are developed and followed. This approach is a

Since the last decade, there has been an increased growth in the electricity production through wind power [8]. Such increasing penetration levels of wind power in to the total generation mix has raised several concerns to the transmission system operators. Some of the issues related to large scale grid integration of wind power causing concern to the transmission system operators are low voltage fault through capability, voltage support during large disturbances and unity power factor operation [7]. This has made the regulators and transmission system operators to introduce new grid standards and requirements for wind farms to make sure the

Through the implementation of peak load leveling utilities can offer better stability regulation services for voltage and frequency, and sudden demands for power can also be met much easier. Via a simple frequency measurement, dynamic load leveling can be provided and determine local demand. This would result in less natural gas or coal-fired power plants being required to meet peak demand or as a back up to protect against unexpected blackouts.

Energy demands are on the rise across the world and in many modernized countries the push for renewable energy is rising. Two of the main renewable energy sources that are getting a lot of attention are wind and solar. One of the difficulties presented with some renewable energy sources are their inherent inconsistency. Wind intensities change from hour to hour and from one season to the next. Solar radiation can be strong one minute and be nearly blocked out the next by a cloud. To make renewable energy more reliable and coincide with strict utility standards the use of power electronics is needed. The advancement in power electronics has also greatly improved in efficiency and allows more energy to be captured by natural resources. Another difficulty with

With the ongoing deregulation of the electric utility industry, numerous changes are continuously being introduced to a once predictable business. With electricity increasingly being considered as a commodity, transmission systems are being pushed closer to their stability and thermal limits while the focus on the quality of power delivered is greater than ever. In addition, dynamic reactive power support is becoming more important,

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].

Large scale cascaded photovoltaic systems is contributing renewable energy world wide due to its unique features like reliability, power quality ,amount of energy harvested and so on. However cascaded PV system is facing one of the tough challenges like reactive power control due to varied power distribution over different PV modules. This paper addresses the issue of effects due to reactive power on system reliability ,power quality and reactive power compensation strategy for optimal operation of system. A photovoltaic system consisting of three 5W, 10V solar modules with converters are used and proposed control strategy is implemented in laboratory. experimental results are presented to demonstrate the effectiveness of proposed reactive power control strategy.

This chapter explores the hardware setup of DFIG system. It also shows experimental results and the performance of this system under different types of controllers. The experimental work is divided into three parts. The first part is emulating the wind turbine characteristic using PMSM. The second part is implementing the GSC connected to the grid and maintaining its DC-link voltage constant under different disturbances. The final part is controlling the DFIG to extract power from the wind emulator and transfer it to the utility grid.

This section investigates the performance of the proposed control algorithm of DSTATCOM by means of computer simulations in MATLAB/Simulink environment. Tracking and harmonic decomposition capability of the proposed AANF are evaluated in this section, and the performance of the whole system for load balancing, the harmonic compensation, the neutral current compensation, and the power factor correction will be investigated in Section 5.

Finally simulation results have been presented to indicate the improvement in the performance of the UPFC to control voltage in disturbed power systems.

This paper deals with the staging the evaluation of a three- phase Shunt Active Power Filter for Power Quality improvement. Power Quality problems can be take up using Shunt Active Power Filters. A simulation model based on mathematical model of a three-phase shunt active power filter has been developed. The results show an inherent power quality improvement in terms of reduced Total Harmonic distortion (THD) of source current. It also betrays power factor correction (PFC) properties to a large extent as the source current and source voltage are in phase. Keywords- shunt active power filter (SAPFs), Total harmonic distortion (THD), Proportional integral (PI) and Hysteresis current controller (HCC).

ABSTRACT: -- In this a fuzzy logic control technique has been proposed for power quality improvement by using UPQC The UPQC is controlled to regulate the WF terminal voltage, and to mitigate voltage fluctuations at the point of common coupling (PCC), caused by system load changes and pulsating WF generated power, respectively. In order to reduce the voltage fluctuations that may cause “flicker”, and improve WF terminal voltage regulation, several solutions have been posed. The voltage regulation at WF terminal is conducted using the UPQC series converter, by voltage injection “in phase” with PCC voltage. On the other hand, the shunt converter is used to filter the WF generated power to prevent voltage fluctuations, requiring active and reactive power handling capability. The sharing of active power between converters is managed through the common DC link. A customized internal fuzzy logic control scheme of the UPQC device was developed to regulate the voltage in the WF terminals, and to mitigate voltage fluctuations at grid side. Simulation results show the effectiveness of the proposed compensation strategy for the enhancement of Power Quality.