A Novel Modeling And Design Of Statcom With Controllable Grid Connected Variable Speed Wind Energy Supply System Essay

Fig. 5.12. Control of the dc–dc converter with FLC to produce less power under voltage sag: grid voltages, related grid currents, related dc-link

are many types of clean energy sources such as: solar, wind, and hydroelectric. These energy

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

Optimum use of renewable source of energy like Wind can be considered as one of the answer to rapid increase in the demand of energy worldwide. Using the current technological advancements it is commercially viable to use the wind power as a source of energy for small scale to large scale industry.All kind of renewable source are highly dependent on environmental conditions and can not be controlled fully. Due to this inherent characteristics, power generation may vary. In the

Alternative energy includes forms that can be continuously renewed without the concern of the supply running out. Over the last two centuries, renewable energy has become much more popular, worldwide. Forms of renewable energy most popularly include solar, wind, and hydroelectric power. Laws and regulations are constantly created to improve the forms of energy we use and the amount in which each form creates. Alternative energy is also referred to as renewable, and received its name from being the alternative to the traditional forms which include the burning of coal, wood and oil, which are considered nonrenewable. The environmental impact of nonrenewable energy is much more severe and permanent than that of the newer forms. Due to the

As globalization is spreading around the world, demand for energy has increased in recent years. There are different types of energy sources to meet this demand, such as solar power, wind power and fossil fuels. However, they are contributing to environmental problems, particularly global warming and air pollution.

With the aim of combating climate change there is a desire to increase the penetration of renewable generation in the UK network at both transmission and distribution level. The introduction of renewable generation into the network presents numerous technical challenges due its inherent intermittency. For example, if a large-scale wind farm is connected to the transmission network and the wind speed is approximately 28ms creating a 1GW output. Suddenly the wind speed rapidly increases above the cut-off wind speed of 25ms, causing the entire wind farm to shut down. This sudden loss of generation could potentially cause an unacceptable frequency deviation and lead to a

Recently, wind power has gained greater attention with respect to sources of renewable energy due to the maturity of the technology and its relative cost competitiveness. Wind power farms (WPFs) are scattered in remote areas (onshore and offshore) selected by the wind speed, water depth, and distance to shore. It is important to develop technology to monitor WPFs with higher capacities as the size and number of wind turbines in a WPF is continuously increasing. In order to provide real-time control and monitoring, reliable bi-directional communication infrastructure is needed. According to their needs, most turbine manufacturers have developed their own monitoring and control systems due to an absence

Indiscriminant application of individual distributed generators can cause as many problems as it may solve. better way to realize emerging potential of distributed generation is to take system approach which views generation, associated loads as subsystem or “microgrid”. This approach allows for local control of distributed generation thereby reducing or eliminating need for central dispatch. During disturbances, generation, corresponding loads can separate from distribution system to isolate

According to preliminary estimates, China 's offshore wind energy resources are about three times of the land, which is about 750 MKW. All wind energy resources that can be developed reach about one BKW, equivalent to about 2 times the current installed capacity of China 's total electricity. From the terms of installed capacity and annual

In order to ensure stable operation of electric power system, a super capacitor energy storage system (SCESS) superior to other energy storage technologies and doubly fed induction wind generator (DFIG) are presented in this paper, SCESS is connected to the grid at the point of common coupling (PCC). Matlab/Simulink software is used for modelling

Abstract: In this paper voltage stability is evaluated b-v both dynamic P V curves and time-domain simulations, considering the combined dynamic control effects of a static compensator (SZ4TCOh!) and transformer on-load-taps (OLT). The studied system is heavily loaded at hvo locations and an 80 Mvar STA TCOM is connected to improve the voltage stability of entire s~stem for a contingency of a three-terminal line outage. The resu[ts presented in this paper: (a) show that a STA TCOM can greatly improve the voltage stability of a heavily loaded system, (b) quantl~ the combined impacts of SZ4TCOM and OLT control: (c) illustrate that the margin of stability can be easily and effectively evaluated by P V curves; (d) correlate tirnedomain simulations and P V curves for a system with a STATCOM and OLT dynamic control. Keywords: FACTS, STATCOM, Voltage Stability, PV Curve, Stability Margin, Voltage/Var Control

A few recent papers [53]-[56] have demonstrated a virtual synchronous machine (VSM) concept, particularly for microgrid applications and usually for distributed generators utilizing the same ac-dc-ac conversion stages. The same concept applied on flywheel based energy storage is discussed in [57]. Given the similarities existed in the MEA power grid and motor controlled thermal storage, it is deemed feasible to implement the VSM concept in this research. A high-level description is shown in Fig. 3. For a synchronous machine in the rotating reference frame, the d-q voltage and current relationship is shown in (1a-b), where vg is the grid voltage, R is the stator resistance, M is the magnetizing, and Ld = Lq = L is assumed. On the other hand, the active front end (i.e., the hex-bridge converter connected to the gird) follows (2a-b) in d-q reference frame at ωc rotating speed, where Rg and Lg are grid tied resistance and inductance, and vc is the output voltage at the converter controlled by modulation index from the dc voltage bus []. The analogy between (1a-b) and (2a-b) is straightforward. By equating the first three terms and varying the modulation indices, md and mq, the active front end mimics the VSM proposed in [ZhongQC]. The purpose of the ac motor-tied inverter (i.e., the left hex-bridge converter in Fig. 3) is to main a constant 270 V dc bus by adjusting the motor speed and torque using conventional vector controls. Given the limited

Fig. 7 (a-b) show the real and imaginary parts of the rotor voltage respectively for all operating wind speeds. As shown in Figs. 7(a) and 7(b), increasing of DFIG stator lead reactive power, increases the real and imaginary part of rotor voltage which supplied by the rotor converter. Increasing DFIG stator lag reactive power, decreases the real part of rotor voltage in all speed range, increases the imaginary part of rotor voltage in sub-sunchronous speed range and decreases the imaginary part of rotor voltage in super-sunchronous speed range.

This paper deals with a four-leg distributed static compensator (DSTATCOM) which is used to solve the current related power quality. An amplitude adaptive notch filter (AANF) is employed for the reference current extraction of DSTATCOM control scheme because of its simplicity, capability of frequency and amplitude measuring, appropriate extraction of the fundamental signal, and insensitivity to the amplitude variation of the input signal. To generate the gate pulses of the switches, an adaptive hysteresis band current controller is used. In addition, fuzzy logic controllers are used for a better performance of DSTATCOM under dynamic conditions. The proposed control algorithm is robust to power disturbances, especially when the main voltage