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This paper illustrates the implementation and the study of a hybrid electric power system based on a 10kW-diesel generator associated to renewable energy sources including a 10kW wind turbine, 12kW photovoltaic, and 53Ah lithium-battery. These energy production sources are interfaced to micro-grid through three-level power electronics converters where the phase-to-phase RMS voltage is 600V. The variable...
Wind energy have for many years been a growing alternative to fossil energy. The sizes of turbines are increasing to megawatt level. Wind turbines operate in a wide range of wind speeds but are shot down for high wind speeds. Traditional concepts are relatively stiff and have a cause stress on the gearbox. The turbine described in this paper overcomes some of these challenges by having flexibly and...
This paper presents the development and performance evaluation of a new controller for permanent magnet generator (PMG)-based wind energy conversion systems (WECSs) that are equipped with battery storage units. The proposed controller is developed to ensure the voltage and frequency stability under changes in the grid demands for active and reactive powers, and under under variations in the wind speed...
Nowadays, the continuously increasing of the energy consumption all over the world presents the cause of renewable energy sources development. In this context, wind energy conversion systems (WECS) based on double fed induction generator (DFIG) are widely used in both grid connected and stand-alone modes. In both cases, management and control technologies are widely developed in the literature. In...
The use of wind turbine as electricity source is growing globally and as consequence the grid codes are becoming more restrict. The restrictions depends on the country that the system is installed and basically limits the system disconnections during determined faults and demands the injection or absorption of active or reactive power during those faults to ensure a fast return of the system to its...
Aiming to elevate the ability of wind power to improve power quality of power system, this article proposed a coordinated control strategy based on adaptive fuzzy control to improve the frequency and voltage quality of power system using wind power and energy storage (ESS). This strategy firstly detects the frequency and voltage deviation of power system. Then using the adaptive fuzzy control determines...
This paper presents the modeling and simulation of isolated wind diesel hybrid system (WDHS) consisting a wind turbine generator (WTG) along with a diesel generator (DG), Ni- Cd battery base energy storage source (BESS) and a dump load (DL) provides the supply to consumer load. WTG and BESS are used in the system to minimize fuel consumption, but this makes the system more complex. The consumer load...
This paper presents a control strategy of a micro-wind turbine system (WTS) in AC MicroGrid (MG) with the capability of providing ancillary services to the MG and participating to its regulation. The WTSs can be controlled to operate at their maximum efficiency or as controllable source by tracking a power reference set by the energy management system. Hence, the active control of micro-wind turbine...
This paper introduces an application of wind energy conversion system (WECs) with matrix converter. Due to the enormous advantage of WECs make it suitable source of energy. When the wind speed changes the generated voltage rms value and frequency will be changes and this will effect on the performance of the load so matrix converter is used to control the voltage and frequency of the load. A self-excited...
This paper presents control scheme for a standalone microgrid having a non-dispatchable fixed-pitch variable-speed wind turbine generator (WTG) and a battery energy storage (BES). The WTG is directly interfaced at a point of common coupling (PCC) and the BES is interfaced at the PCC via a bidirectional DC-AC converter. The unique aspect of the control strategy is that the BES not only regulates voltage...
This paper presents the investigation of a self excited induction generator driven by a wind turbine and supplying an RL load. In this work, we focus to analyze a constant voltage-frequency operation mode. However, a pitch angle and an excitation capacitor control is needed to established a suitable operation mode. In order to improve robustness and to maintain at stable value the voltage and the...
This paper presents a control strategy for a standalone wind-energy conversion system using Permanent Magnet Synchronous Generator (PMSG). The presented control strategy aims at regulating the load voltage in terms of magnitude and frequency under different operating conditions including windspeed variation, load variation and the unbalanced conditions. The wind generating-system under study consists...
With the more substantial large-scale wind integration projects implemented in the province of Alberta, wind power has been growing steadily in the province to meet the increasing consumer demands. Meanwhile the transmission and distribution networks are being updated to satisfy the transmission capacity. Under the transmission line and substation construction with planned transmission line outages,...
This paper investigates the control design when a wind power base of doubly fed induction generators (DFIGs) is directly connected to line-commutated converter (LCC) HVDC link. Firstly, the positive feedback characteristic of PLL in DFIG is analyzed, which allows DFIG to self-maintain frequency without an available grid voltage reference. Furthermore, in order to avoid the rapid variation of HVDC...
This paper presents an innovative DFIG which has autonomous frequency control for stand-alone operation. When the wind farm is islanded, such DFIGs synchronize to form a reliable wind farm frequency source which does not collapse when member DFIGs fail. The frequency enables frequency droop control to be implemented for load sharing. The wind farm can provide fast reserve, ready to support a weakened...
Multiterminal HVDC (MTDC) schemes are intended to transfer power from offshore wind farms to land and interconnect the grids of adjacent countries, through Voltage Source Converters (VSC). The modular multilevel converter (MMC) topology of VSCs is a more recent development which has low harmonics, reduced losses and occupies less space. This paper analyses the frequency support characteristics of...
A Smart Transformers (ST) is an automated transformer based on the latest power electronics and communication technologies. It aims not only at replacing the traditional transformer, but at providing also ancillary services to the grid, thanks to the greater flexibility offered by power electronics. However, in the case of grid overload caused by high load demand or high production from renewable...
This paper proposes a coordinated control strategy for VSC-HVDC connected offshore wind farms (OWF) which enhances the ability of the VSC-HVDC system to contribute more synthetic inertia without needs of communications. Different from the previous inertia emulation methods, the proposed method utilizes the OWF to supply additional fast active power change and can provide larger synthetic inertia without...
This paper presents a distributed control technique for voltage, frequency and active/reactive power control of the Point of Common Connection (PCC), AC grid, of a wind farm. Each wind turbine uses a Permanent Magnet Synchronous Generator (PMSG) with a full back-to-back VSI topology connected between the machine terminals and the PCC. A Diode-Thyristor converter topology forming a HVDC link is used...
In close future, with high Wind Power (WP) penetration in the power system, the burden of Load-Frequency Control (LFC) is gradually shifted to Variable Speed Wind Turbines (VSWTs). In order to equip the VSWT with LFC capability to support the grid during sudden load-generation imbalance, sufficient reserve capacity should be procured. This paper addresses the LFC scheme offered by VSWT. Feedback loop...
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