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Active and reactive power flow control and power quality improvement of a two level Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) system operating at fundamental frequency switching is proposed in this paper. Two converter stations used in this HVDC system consists of two level VSC configuration to achieve active and reactive power control with fundamental frequency switching...
A hybrid fuzzy-PI controller for voltage source converter based HVDC (VSC-HVDC) transmission system is proposed in this paper. At first, the elementary model of VSC-HVDC is described. Then the fuzzy self-tuning control strategy is proposed, in which direct current control strategy and dual closed loop structure are designed in dq synchronous reference frame. Independent control of the active and reactive...
This paper proposes an approach to the selection and optimization of the parameters of the proportional-integral (PI) compensators in the various control loops of a VSC-HVDC transmission system using a decoupled control strategy. An optimization algorithm based on the simplex method is adopted. The objective is to simultaneously minimize the weighted sum of the “integral of the time absolute-error...
The performance of VSC based HVDC system partially depends on its control strategy. Based on the steady state model of VSC-HVDC system, a power control strategy is proposed and a series of mathematical analysis expressions for power delivery are deduced using the coordinate conversion and variables substitution in terms of the original equations. The corresponding power controllers are designed using...
This paper proposes a dynamic model and control strategies of a voltage source converter (VSC) based high voltage direct current transmission system. Assuming there is no zero-sequence components exist and the AC network is balance, so there are no negative-sequence components and the voltage and current variables are all positive-sequence components expressed in the positive-sequence frame. In this...
In this paper, the model-based direct power controller (DPC) is proposed for a multi-terminal high voltage direct current (HVDC) using Voltage source converter (VSC), which is able to control directly the instantaneous power and reactive power. Moreover, this DPC is able to handle the unbalanced network condition, that is unequal AC voltage due to unbalanced power supplies, unbalanced loads and unavoidable...
This paper presents a discrete-time nonlinear control of a voltage source converter (VSC) transmission system for wind farm connection to electrical network. After introducing discrete-time modeling of a VSC transmission scheme, discrete-time currents (i.e. P and Q) and DC bus voltage controllers synthesis is presented. Both voltage and current limitations are then taken into account through the introduction...
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