Abstract
This paper investigates the steady-state and transient performance of high-voltage DC (HVDC) transmission systems connected to passive network. The VSC HVDC tie employing PWM may well represent the ultimate FACTS device. Besides controlling the through power flow, it can supply reactive power and provide independent dynamic control at its two terminals. The control systems for rectifier and inverter are discussed in DC (HVDC) transmission systems based on three-level voltage source converters. The study involves analysis of active-reactive power capabilities (P-Q envelope) including active power flow and provision of voltage support to AC networks. The transient performance is explored by examining the VSC_HVDC response to external AC faults. Finally, the models and results are presented and tested by simulations using Matlab Simulink and its toolbox SimPowerSystems.
Highlights
INTRODUCTIONWith the scale of the new energy utilization enlarging, and the power requirements of offshore drilling platforms, isolated island, and other passive load, the traditional ac/dc transmission technology becomes diseconomical and environmental pollution
With the scale of the new energy utilization enlarging, and the power requirements of offshore drilling platforms, isolated island, and other passive load, the traditional ac/dc transmission technology becomes diseconomical and environmental pollution.VSC-highvoltage DC (HVDC) system is a new generation of HVDC technology based on pulse width modulation and voltage source converter (VSC), the modern high-power power electronic technology applied in the power system
VSC-HVDC system is a new generation of HVDC technology based on pulse width modulation and voltage source converter (VSC), the modern high-power power electronic technology applied in the power system
Summary
With the scale of the new energy utilization enlarging, and the power requirements of offshore drilling platforms, isolated island, and other passive load, the traditional ac/dc transmission technology becomes diseconomical and environmental pollution. The introduction of pulse width modulated voltage source converter technology into highvoltage DC (HVDC) transmission systems has increased their viability in many applications in terms of cost and performance [6]. Independent control of active and reactive power (allowing the converters to provide damping, frequency and voltage support to AC networks without compromising system performance). The vector control method is studied using 3-level VSC connected to an active AC system at the first end & passive load at the second end of the HVDC link. Compared to previous studies [6,7,9], this paper focuses on the controller performance in the operation range against some steps change in the load and shows the control of active and reactive power. The simulation results confirm that the control strategy has fast response and strong stability
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