Three-phase Permanent Magnet Synchronous Generator Research Articles

Solid‐state controller for three‐phase permanent magnet synchronous generator‐based diesel generator set feeding single‐phase loads

This study deals with the voltage control and power quality improvement of a permanent magnet synchronous generator (PMSG)-based diesel generator (DG) set feeding single-phase loads using a solid-state controller. The proposed system consists of a PMSG driven by a diesel engine at constant speed, a three-leg voltage source converter (VSC) with a capacitor on its DC link and single-phase load connected between two terminals of the generator. Most of the domestic loads are single phase but three-phase generation is more reliable and efficient than single-phase generation. Therefore a three-phase PMSG is proposed for feeding such types of loads. The VSC is used as a solid-state controller to control the terminal voltage, to eliminate harmonics from the source currents and voltage and to provide load balancing while feeding single-phase loads from three-phase PMSG. An adaptive theory-based improved linear sinusoidal tracer (ILST)-based control algorithm with selectable frequency (ωo) and bandwidth (Δ) is used to estimate balanced reference source currents. The main contribution of this study is the power quality improvement of PMSG-based DG set using a solid-state controller along with hardware implementation of a novel ILST-based control algorithm for voltage control across the load.

Self-Tuning Resonant Control of a Seven-Leg Back-to-Back Converter for Interfacing Variable-Speed Generators to Four-Wire Loads

This paper considers the control of a seven-leg back-to-back voltage source inverter arrangement, feeding a four-wire load from a three-phase permanent-magnet synchronous generator (PMSG) operating at variable speed. The PMSG is controlled using a sensorless model reference adaptive system to obtain the rotor position angle. The seven-leg converter is regulated using resonant controllers at the load side and self-tuning resonant controllers at the generator side. The control system is augmented by a feedforward compensation algorithm that improves the dynamic performance during transients. Experimental results, which are obtained from a prototype, are presented and discussed.

Current output hard‐switched full‐bridge DC/DC converter for wind energy conversion systems

A current output hard-switched full-bridge (HSFB) converter is presented with an intermediate high-frequency transformer as an option of a wind energy conversion system (WECS). The wind turbine simulator, based on an induction machine driving a three-phase permanent magnet synchronous generator, simulates practical wind turbine characteristics. A comparative analysis of electrical stresses on the switches of the boost converter and the current output HSFB converter is carried out at different wind speeds and maximum operational power point based on their mathematical models. The control system of the current output HSFB converter is illustrated. Then two dynamic responses of the combined mechanical and electrical systems of the WECS are investigated, under wind speed step changes. Simulation and experimental results demonstrate the feasibility and stability of a current output HSFB converter-based WECS.

Power conversion interface for small‐capacity wind power generation system

Power conversion interface for small-capacity wind power generation system based on permanent-magnet synchronous generator (PMSG) is proposed in this paper. The proposed power conversion interface will convert the wind power generated from the three-phase PMSG to a high quality power to inject into the single-phase utility. This power conversion interface comprises of a power converter and a zero-sequence transformer set. The power converter is controlled to generate a set of positive-sequence currents to absorb a real power from the three-phase PMSG and a set of zero-sequence currents to pass through the zero-sequence transformer set to the single-phase utility. A feed-forward control is used to control the proposed power conversion interface so as to simplify the control circuit. A simplified maximum power point tracking method is also proposed and incorporated in the control circuit of the power conversion interface to extract the maximum power of the PMSG-based wind power generation system. Hence, the proposed power conversion interface has the advantages of simplifying both the power circuit and the control circuit. A prototype is developed to demonstrate the performance of the proposed power conversion interface. The experimental results show that the proposed power conversion interface can achieve the expected performance.

Voltage Control of PM Synchronous Motor Driven PM Synchronous Generator System Using Recurrent Wavelet Neural Network Controller

In this paper the two novel recurrent wavelet neural network (RWNN) controllers are proposed for controlling outputdirect current (DC) voltage of the rectifier and output alternate current (AC) voltage of the inverter. The output powerof the rectifier and the inverter is provided by three-phase permanent magnet synchronous generator (PMSG) systemdirectly-driven by permanent magnet synchronous motor (PMSM). Firstly, the field-oriented mechanism isimplemented for controlling output of the PMSG system. Then, one RWNN controller is developed for controllingrectifier to convert AC voltage into DC link voltage and the other RWNN controller is implemented for controllinginverter to convert DC link voltage into AC line voltage. Moreover, two online trained RWNNs using backpropagationlearning algorithms are developed for regulating both the DC link voltage of the rectifier and the AC line voltage of theinverter. Finally, the effectiveness and advantages of the proposed two RWNN controllers are demonstrated incomparison with the two PI controllers from some experimental results.

Voltage Control of PM Synchronous Generator System Using Recurrent Wavelet Neural Network Controller

A recurrent wavelet neural network (RWNN) controller is proposed to control output voltages for a permanent magnet synchronous motor (PMSM) direct drive three-phase permanent magnet synchronous generator (PMSG) system at stand-alone power application in this paper. First, the field-oriented mechanism is implemented for the control of the PMSG system. Then, a rectifier (AC/DC power converter) and an inverter (DC/AC power converter) are developed to convert the electric power generated by a three-phase PMSG system. Moreover, two online trained RWNNs using backpropagation learning algorithm are developed as the regulating controllers for both the DC-link voltage of the rectifier and the AC line voltage of the inverter. Finally, to show the effectiveness of the proposed controller, comparative studies with PI controller are demonstrated by experimental results.

Conventional and TFPM Linear Generators for Direct-Drive Wave Energy Conversion

The archimedes wave swing (AWS) is a system that converts ocean wave energy into electric energy. The goal of the research described in this paper is to identify the most suitable generator type for this application. Of the conventional generator types, the three-phase permanent-magnet synchronous generator with iron in both stator and translator is most suitable, because it is cheaper and more efficient than the induction generator, the switched reluctance generator, and the permanent-magnet (PM) generator with an air-gap winding. The paper also proposes a new transverse-flux PM (TFPM) generator topology that could be suitable for this application. This new double-sided moving-iron TFPM generator has flux concentrators, magnets, and conductors on the stator, while the translator only consists of iron.