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Method for statically analyzing voltage stabilization of VSC-HVDC (Voltage-Sourced Converter-High Voltage Director Current) containing AC and DC system

An AC/DC system, static analysis technology, applied in AC network circuits, DC network circuit devices, electrical components, etc., can solve problems such as commutation failure failures

Inactive Publication Date: 2011-02-16
HOHAI UNIV +1
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Problems solved by technology

[0003] The traditional HVDC using thyristor commutation equipment can only control the conduction angle, and needs reverse voltage to realize shutdown. The possible commutation failure of thyristor commutation equipment has become a major threat to the safe operation of the system; and the commutation process To consume a large amount of reactive power, it poses a serious challenge to the voltage stability of the AC system connected to it

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  • Method for statically analyzing voltage stabilization of VSC-HVDC (Voltage-Sourced Converter-High Voltage Director Current) containing AC and DC system

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0035] Since the continuum power flow (CPF) problem was proposed in the early 1990s, it has made great progress and been widely used in the study of static stability of power systems. Due to the practicability of its model and the robustness of its algorithm It has become a basic calculation engine in energy management system (EMS). As a powerful tool for voltage stability analysis, the continuous power flow method can solve the convergence problem when the system equation is close to the stability limit operation state. By continuously updating the power flow equation, the power flow equation remains convergent under all possible load states, no matter in There are solutions for both stable and unstable equilibrium points. Based on the unified iterative power flow algorithm of the AC-DC hybrid system, the present invention establishes the voltage stability stati...

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Abstract

The invention discloses a method for statically analyzing voltage stabilization of a VSC-HVDC (Voltage-Sourced Converter-High Voltage Director Current) containing AC and DC system. Aiming at the problem of voltage stability, through determining a tide equation and a converter equation of the VSC-HVDC AC and DC system and considering the change of a load and a generator output, a tide equation containing parameters is formed and a static model of the VSC-HVDC AC and DC hybrid system is established; and the static model is analyzed by adopting a continuous tide method based on a uniform iteration method, and the influence of a VSC-HVDC element on the voltage stability of the system is researched. The invention lays a foundation for further researching the voltage stability characteristic ofthe VSC-HVDC AC and DC hybrid system.

Description

technical field [0001] The invention relates to a static analysis method for voltage stability of an AC-DC hybrid system including a voltage source converter type high voltage direct current transmission (VSC-HVDC), belonging to the technical field of power system operation and control. Background technique [0002] At present, my country's power system has entered the stage of transition from regional power grids to national interconnected power grids. High-voltage direct current transmission (HVDC) has obvious advantages in ultra-long-distance power transmission and system interconnection. my country's Southern Power Grid and East China Power Grid have formed an AC-DC hybrid transmission network. The AC-DC hybrid system has a larger transmission capacity and a more flexible operation mode. The introduction of multiple DC tie lines improves the controllability of the entire system, but it also brings some special problems, making the AC-DC hybrid system safe. The stability...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/18H02J1/00
CPCY02E40/30
Inventor 卫志农韦延方孙国强
Owner HOHAI UNIV
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