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The multiterminal dc wind farm is a promising topology with a voltage-source inverter (VSI) connection at the onshore grid. Voltage-source converters (VSCs) are robust to ac-side fault conditions. However, they are vulnerable to dc faults on the dc side of the converter. This paper analyzes dc faults, their transients, and the resulting protection issues. Overcurrent faults are analyzed in detail...
This paper discusses the protection schemes for the converter of permanent magnet synchronous generator (PMSG) to enhance the fault ride-through (FRT) capability. The power conversion topology of the studied system includes a rectifier, DC/DC boost converter and a voltage source inverter (VSI) connected to the grid. A protection scheme with rectifier-boost damping resistor and inverter DC-link voltage...
This paper proposes a new converter protection method, primarily based on a series dynamic resistor (SDR), that avoids the doubly-fed induction generator (DFIG) control being disabled by crowbar protection during fault conditions. A combined converter protection scheme based on the proposed series dynamic resistor and conventional crowbar is analysed and discussed. The main protection advantages are...
This paper discusses the detailed switch-timing for converter protection schemes of doubly-fed induction generator (DFIG) to enhance the fault ride-through (FRT) capability. A new combined protection scheme with crowbar and series dynamic resistor (SDR) is used as proposed in former papers. Protection resistance values are calculated after the analysis of rotor fault current for practical application...
This paper from the point view of wind farm fault ride-through (FRT) capability, discusses the performance of converter protection schemes to it. Different resistor protection methods are summarized and then a new combined protection with crowbar (CB) and series dynamic resistor (SDR) is proposed. With the analysis of rotor current during fault, resistance values are calculated for practical application...
Fault ride-through capability is one of the basic requirements for a large-scale wind farm. There are two aspects to fault ride-through: to continue power supply without breaking any part of the system and to resume normal operation after clearance of the fault. In this paper the transients of the doubly-fed induction generator is analyzed. The safe operating area characteristics of the IGBT converter...
A DC/DC switching converter is a strongly nonlinear control system. The study on chaotic phenomena and chaos control is a hotspot of the power electronics. In this paper the dynamical model of current-mode controlled boost converter has been studied. Based on expansion of ramp compensation method and parametric resonance perturbation method, we used three different perturbation signals (i.e. sine...
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