An Offshore Wind Generation Scheme With a High-Voltage Hybrid Generator, HVDC Interconnections, and Transmission

Beik, Omid; Schofield, N.

doi:10.1109/tpwrd.2015.2492472

Cited by 37 publications

(23 citation statements)

References 16 publications

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“…The HG scheme therefore reduces turbine plant and hence system mass while accessibility and maintenance is improved [14], [16] system which results in equitable interconnection cable mass given the same copper loss, current density and hence similar thermal performance for the AC and DC interconnection cable systems. The proposed HG rated output power is 5 MW at a nominal speed of 600 RPM.…”

Section: Hybrid Generator (Hg) Concept and Turbine Operational Chmentioning

confidence: 99%

High-Voltage Hybrid Generator and Conversion System for Wind Turbine Applications

Beik

Schofield

2018

IEEE Trans. Ind. Electron.

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This paper presents the design of a high voltage hybrid generator (HG) and conversion system for wind turbine applications. The HG combines wound field (WF) and permanent magnet (PM) rotor excitations. At any given speed, the PM induces a fixed stator voltage while the WF induces a variable controlled stator voltage. The HG alternating output is rectified via a passive rectification stage, hence the machine net DC output voltage is controlled over a prescribed, but limited range. The split ratio between PM and WF rotor sections is considered as varying from a fully WF rotor, or traditional synchronous generator (SG), to some ratio of PM to WF excitation. The turbine operational characteristics and maximum wind velocity variations between turbines in a wind farm are used to define the WF to PM split ratio. Both a 3-phase and a 9-phase stator winding design are investigated. The 9phase winding results in 4.2% higher output RMS voltage that yields a more power dense solution. It further yields lower rectified DC-link voltage ripple. The HG mass, loss audits and efficiency discussions are presented. In order to investigate the feasibility of the HG concept a small scale laboratory prototype is designed and operational test results presented that show good agreement with the simulation model results.

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Section: Hybrid Generator (Hg) Concept and Turbine Operational Chmentioning

confidence: 99%

High-Voltage Hybrid Generator and Conversion System for Wind Turbine Applications

Beik

Schofield

2018

IEEE Trans. Ind. Electron.

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“…High-voltage direct current (HVDC) transmission is getting more and more attention and applications due to its advantage in long-distance bulk power transmission and fast modulation [1,2]. In the planning of offshore wind farms, HVDC transmissions are widely applied for grid connection [3,4], and China Southern Power Grid (CSG) is building a large-scale multi-infeed HVDC (MIDC) network with a total installed generation capacity of more than 243 GW [1]. Line-commutated converter HVDC (LCC-HVDC) is used in most HVDC projects in the CSG.…”

Section: Introductionmentioning

confidence: 99%

An on-line power/voltage stability index for multi-infeed HVDC systems

Lan

Liao

et al. 2019

J. Mod. Power Syst. Clean Energy

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High-voltage direct current (HVDC) transmission is playing an increasingly important role in modern power systems, and the resulted power/voltage stability issue has raised widespread concern. This paper presents an on-line power/voltage stability index (PVSI) for multi-infeed HVDC (MIDC) systems. Different from the existing indices which are developed mainly for off-line and static analysis, the proposed PVSI can be applied in real time.Effects of system changes on stability assessment such as change of system states and control strategies are considered. Thus, helpful guidance can be provided for on-line HVDC stability and controls. The PVSI is originally deduced for single-infeed HVDC systems in an ''AC way'' by analyzing the power and voltage stability of both pure AC systems and HVDC systems. Moreover, its on-line application in practical MIDC systems is realized by building an equivalent single-infeed model, and utilizing nowadays measurement and communication infrastructures such as wide-area measurement system (WAMS). The effectiveness of the PVSI is verified through simulations in real-time digital simulator (RTDS).

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“…DC-AC converters are eliminated to reduce costs, but the system is only suitable for fixed speed wind power generators. To remove the need for an offshore platform, the topology of DC power collection has been proposed in references [14,15], as is shown in Figure 1b. Each wind turbine is connected to the DC bus by an AC-DC-DC converter.…”

Section: Introductionmentioning

confidence: 99%

HVDC Transmission Technology of Wind Power System with Multi-Phase PMSG

et al. 2018

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The high voltage DC (HVDC) transmission technology of wind power system, with multi-phase permanent magnetic synchronous generator (PMSG) is proposed in this paper. Each set of three-phase winding of the multi-phase PMSG was connected to a diode rectifier. The output of the diode rectifier was connected by several parallel isolated DC–DC converters. Each DC–DC converter was connected to a sub-module (SM). All SMs and two inductors were connected in a series. The proposed wind power system has several advantages including, transformerless operation, low cost, low voltage stress, and high fault tolerance. The maximum power point tracking (MPPT) and energy balance of the DC–DC converters were achieved by controlling the duty cycles of the DC–DC converters. The HVDC transmission was achieved by the nearest level control (NLC) with voltage sorting. The simulation model with 18-phase PMSG was established. Experimental results were also studied based on RT-Lab.

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An Offshore Wind Generation Scheme With a High-Voltage Hybrid Generator, HVDC Interconnections, and Transmission

Cited by 37 publications

References 16 publications

High-Voltage Hybrid Generator and Conversion System for Wind Turbine Applications

High-Voltage Hybrid Generator and Conversion System for Wind Turbine Applications

An on-line power/voltage stability index for multi-infeed HVDC systems

HVDC Transmission Technology of Wind Power System with Multi-Phase PMSG

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