Abstract
This paper analyzes the power stability of the hybrid dual-infeed high-voltage direct-current (HVDC) system containing a line commutated converter-based HVDC (LCC-HVDC) and a voltage source converter-based HVDC (VSC-HVDC). First, the concept and the calculation method of power stability for the hybrid dual-infeed HVDC system are introduced. Second, the influence of VSC-HVDC on the power stability of the system is investigated. Third, the relationship between the power stability and the effective short circuit ratio (ESCR) is discussed under different system parameters. Then, the value range of the critical effective short circuit ratio is determined. Finally, the evaluation criteria of power stability are proposed. The results show that the evaluation criteria of the single-infeed LCC-HVDC system can still be used, if the VSC-HVDC is in constant AC voltage control mode; if the VSC-HVDC is in constant reactive power control mode, the hybrid dual-infeed HVDC system cannot operate stably when the ESCR is less than 2.0 and can operate stably with high power stability margin when the ESCR is greater than 3.0. The ESCR index can still be used to measure the power stability of the hybrid dual-infeed HVDC system.
Highlights
This paper analyzes the power stability of the hybrid dual-infeed high-voltage directcurrent (HVDC) system containing a line commutated converter-based HVDC (LCC-HVDC) and a voltage source converter-based HVDC (VSC-HVDC)
Qd2 = Qd2ref converter operates in constant reactive power control mode, there is: When the VSC converter operates in constant AC voltage control mode, there is: (6)
Based on the concepts of the maximum power curve and the power stability index, this paper has analyzed the influence of VSC-HVDC on the power stability of the hybrid dual-infeed HVDC system and further studied the quantitative relationship between the power stability and the effective short circuit ratio under different system parameters
Summary
A simplified hybrid dual-infeed HVDC transmission sysAs illustrated, a simplified hybrid dual-infeed HVDC transmission system tem consists of one LCC-HVDC link and one VSC-HVDC link. The connected AC system consists of one LCC-HVDC link and one VSC-HVDC link. The connected AC system is is represented by the Thevenin equivalent circuit. [12]isisadopted, adopted,which whichcan can be expressed by the following algebraic equations: be expressed by the following algebraic equations: Pd1P= V
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