HVDC dynamic phasor calculation method and system combined with phase-locked loop

A technology of dynamic phasors and calculation methods, applied in calculation, automatic control of power, computer-aided design, etc., can solve the problems of lack of phase-locked loop, control system modeling stuck, high complexity, etc.

Inactive Publication Date: 2020-08-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The state space model uses algebraic differential equations to describe the working conditions of the converter topology, but there are few related studies and this method needs to model all possible topological situations, so the algorithm complexity is high
Although there is some research on the dynamic phasor model at present, most

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  • HVDC dynamic phasor calculation method and system combined with phase-locked loop
  • HVDC dynamic phasor calculation method and system combined with phase-locked loop
  • HVDC dynamic phasor calculation method and system combined with phase-locked loop

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[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] The purpose of the present invention is to provide a HVDC dynamic phasor calculation method combined with a phase-locked loop to realize fast and accurate calculation of the transient response of high-voltage direct current transmission.

[0069] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying draw...

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Abstract

The invention relates to an HVDC dynamic phasor calculation method and system combined with a phase-locked loop. A direct current system dynamic phasor model suitable for asymmetric faults is established by analyzing and modeling an HVDC whole system including a phase-locked loop, a converter, a direct current line and a control system, and rapid and accurate calculation of high-voltage direct current transmission transient response is achieved. Compared with a traditional dynamic phasor calculation method, the calculation method is low in time consumption and high in precision, the commutation failure working condition can be solved, closed-loop calculation of the HVDC system is achieved, that is, other electrical quantities such as direct-current voltage, direct-current current, controlled quantity and alternating-current current can be calculated only by inputting three-phase alternating-current voltage, and the model has engineering practical value.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to an HVDC dynamic phasor calculation method and system combined with a phase-locked loop. Background technique [0002] The characteristics of the reverse distribution of energy resources and power load in my country have enabled the rapid development of high voltage direct current (HVDC) with large capacity and long-distance transmission capabilities. With the continuous increase of DC lines in the system, the AC-DC hybrid system puts forward new requirements for the stable operation and relay protection of the power grid system. Therefore, building a new system model and proposing corresponding calculation methods to accurately and quickly solve the transient response of the HVDC system under various faults has become a hot issue in related fields. [0003] At present, relevant scholars mainly propose four models for HVDC systems: quasi-steady state model,...

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Application Information

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IPC IPC(8): H02J3/36H03L7/08G06F30/20G06F113/04
CPCG06F30/20H02J3/36H02J2003/365H03L7/08H02J2203/20Y02E60/60
Inventor 单俊儒刘崇茹
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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