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At the early stages of electric network restoration, the capacity of power system is relatively small, and adding large power load to such a power system will result in severe fluctuation of system frequency and voltage. Thus the stable operation and the restoration speed of power system will be affected seriously. VSC-HVDC (voltage source converter based HVDC) can control active and reactive power...
There are some problems in distribution network such as large power losses, low reliability, needing reactive power, power quality and difficult to control the power flow, etc. The VSC-HVDC is for small-scale power and long distance with flexible control and operation mode. Based on analysis of the structure, technology characteristics and application scope of VSC-HVDC and distribution network, an...
It is very common to switch on a long no-load line in power systems. If nothing has been done, switching surge will appear instantaneously. In this paper, Voltage Source Converter (VSC) based HVDC (VSC-HVDC) technology is used in power system restoration to solve the problem of switching surge when switching on a long no-load line. Control strategies of VSC-HVDC are developed based on PI controllers...
The performance of VSC-HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of VSC-HVDC system are very few up to now. A control strategy based on direct analytic expression for VSC- HVDC is presented and the corresponding control system is...
Conventional HVDC has the advantages of mature state of art and lower cost and the disadvantages of absorbing large reactive power and the danger of commutation fault. Voltage source converter (VSC) based HVDC (VSC-HVDC) has the advantages of flexible operation and control and the disadvantages of high cost. Combining the advantages of the two kinds of transmissions, a novel hybrid HVDC transmission...
VSC-HVDC technology based on voltage source converter (VSC) and isolated gate bipolar transistor is a kind of novel HVDC technology for low power and long distance with flexible control and operation modes. In this paper, the dynamic mathematic model of VSC-HVDC with SPWM control is founded based on analyzing the fundamental principle of VSC-HVDC system. Its switch characteristic and dynamic operation...
Voltage source converter (VSC) based HVDC (VSC-HVDC) technology is a kind of newly developed HVDC transmission technology. Based on analyzing the fundamental functions of VSC-HVDC, a dynamic mathematic model based on energy conservation principle is developed in this paper. The process of energy conversion and dynamic operation mechanism are analyzed. Theoretical analysis and the control system are...
Through the analysis on voltage source converter (VSC) equations in dq0 coordinate system, the state space equation of the generalized plant is gained. By use of Hinfin theory, constant DC voltage Hinfin controller and constant AC voltage controller are designed. On the basis of establishing MATLAB simulation model for transmitting power to passive network via VSC-HVDC system, the simulation of control...
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