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A new converter topology for a permanent magnet synchronous generator based variable speed wind turbine is presented in this paper. Main focus is on a combined topology of a controlled rectifier and a brand new step-up isolated DC/DC converter. This topology (controlled rectifier coupled with a quasi-Z-source based galvanically isolated step-up DC/DC converter) is essential to generate a regulated...
With the growing of electrical energy demand, wind energy gains higher potential and plays a vital role in energy sectors. Direct driven permanent magnet synchronous generator (PMSG) with a full size back-to-back converter set is one of the promising technologies employed with wind power generation. This paper focuses on developing a control scheme of PMSG-based wind turbines to obtain maximum wind...
This paper proposes a new control strategy using less number of sensors for variable speed wind energy conversion system (WECS). Maximum Power Point Tracking (MPPT) algorithm, and near unity power factor correction control (UPF) are achieved at the generator side using direct driven Permanent Magnet Synchronous Generator (PMSG). The PMSG operates at variable wind speed connected to a full controlled...
The low-voltage ride-through (LVRT) capability of a MW-Level variable speed wind turbine with a direct-driven permanent magnet synchronous generator (PMSG) is a hot topic these days. To prevent over-rated dc-link dynamic voltage, a novel dc-link voltage control scheme is proposed. In this paper comparing with traditional control method, the generator-side converter uses a doubly closed loop namely...
Different current source converter topologies for permanent magnet synchronous generator (PMSG) wind turbine applications are presented and analyzed in the paper. In high-power and medium-voltage range, current source converter has its natural advantages, such as simple topology, compact size, high power capability, excellent short circuit protection, and flexible power flow control. However, it also...
The paper studies the performance of variable speed wind turbine (VSWT) configuration with non-inverting buck-boost converter. The wind turbine systems consist of permanent magnet synchronous generator (PMSG) connected to diode rectifier, DC chopper and load. New control strategy, based on the maximum power point tracking (MPPT) and limited power point tracking (LPPT) algorithms is used to improve...
This paper introduces a new control method to track the maximum power point for a Wind Energy Conversion System (WECS). This WECS is based on a permanent magnet synchronous generator (PMSG) fed by a matrix converter. Since the mechanical power generated by the wind turbine is a function of its shaft speed at a given wind velocity, the proposed controller provides the desired voltage at the output...
Wind energy conversion systems is now occupying important space in the research of renewable energy sources. There is a need for more research on wind generators, power converter topologies etc. In this paper behavior of wind generator have been studied in MATLAB. Generator used here for study is permanent magnet synchronous generator (PMSG). This paper also provides comparison of different power...
This paper presents a Model Reference Adaptive Control (MRAC) approach for a Wind Energy Conversion System (WECS) to track the maximum power point. This WECS includes a permanent magnet synchronous generator (PMSG) fed by a matrix converter. Since the mechanical power generated by the wind turbine is a function of its shaft speed at a given wind velocity, the proposed controller provides the desired...
Increased awareness of environmental concerns has caused greater interest in developing power sources based on renewable technologies, such as wind. Due to the intermittent nature of the wind speed, output voltage and frequency of the direct driven permanent magnet synchronous generators (PMSG) are normally unsteady. Recently proposed Z-source inverter has been considered as a potential solution for...
The paper proposes an adaptive sliding observer to accurately estimate the rotor position for a direct-drive permanent magnet synchronous generator (PMSG). Without any position sensor, the generator torque and flux responses retain high performance both in the steady state and during transients. The problem on the shaft encoder installation difficulty, reliability and disturbance in encoder cable...
The control strategy of PMSG should be carefully chosen and designed because it can influence static DC-bus voltage of converter, efficiency of the system and designed capacity of converter. The paper mainly analyses and compares the characteristic of several control strategies of PMSG. In the paper, Us/fs = E0/fs vector control is put forward to control 2 MW high-power PMSG. Compared with other control...
In this paper, a novel rectifier with boost capability is presented. Through control the phase delay angle, the rectifier switches the operating mode from parallel to serial of two sets of power supplies, which is simplified from PMSG. Compared to other topology used in PMSG based variable speed system, the proposed rectifier features low cost, simple control and reliable structure. The topology can...
In the high power direct drive wind energy conversion systems, the power factors of both the generator-side converter and the grid-side converter are controlled to one in order to make full use of the capability of the power converters. In this paper, a novel sensorless unity power factor control method based on the reference coordinate system rotating synchronously with the voltage of the generator-side...
This paper proposes a control strategy for variable speed wind energy conversion system (WECS), incorporating maximum power point tracking (MPPT) algorithm, using direct driven permanent magnet synchronous generator (PMSG). The generator is operated in the speed control mode below the base speed by controlling the terminal voltage using three phase front-end active-rectifier feeding power to the DC...
E.ON Netz new grid code requires the ability from the wind turbines to remain connected to the network when terminal voltage level drops to zero for at least 150 ms. Moreover, wind turbines must also contribute with voltage regulation during and after grid faults. A comparative study analyzing the dynamic behavior of conventional versions of wind turbines based on doubly-fed induction generator and...
Because of energy shortage and environment pollution, the renewable energy, especially wind energy has become more and more considerable all over the world. Direct drive wind energy conversion systems based on multipole permanent magnet synchronous generator (PMSG) have some advantages such as no gearbox, high power density, high precision and easy to control. In our research project, a direct drive...
Since variable-speed generation has a higher energy capturing and converting efficiency than the fixed-speed system, new proposals for wind power system utilize variable-speed generators are introduced, among which permanent-magnet synchronous generator(PMSG) is an attractive choice. This paper describes a sensorless vector control strategy for a direct-driven PMSG, which is connected to the power...
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