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Power grid frequency-modulating method based on flexible direct-current transmission system

A power transmission system, flexible direct current technology, applied in the direction of AC network circuit, power transmission AC network, electrical components, etc., can solve the problems of increasing cost and reducing system reliability

Active Publication Date: 2016-05-04
HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD +1
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  • Abstract
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Problems solved by technology

However, obtaining the grid frequency difference requires setting up a communication channel between the two converter stations, which will inevitably increase costs and reduce system reliability

Method used

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  • Power grid frequency-modulating method based on flexible direct-current transmission system
  • Power grid frequency-modulating method based on flexible direct-current transmission system
  • Power grid frequency-modulating method based on flexible direct-current transmission system

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Embodiment Construction

[0029] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 As shown, grid 1 transmits 200MW active power to grid 2 through a double-ended flexible DC transmission system, and the rated voltage and rated power of the flexible DC transmission system are ±200kV and 250MW, respectively. Grid 1 includes a 300MW equivalent synchronous generator G1 and a 100MW load; grid 2 includes a 250MW equivalent synchronous generator G2 and a 450MW load. Both rectifier station and inverter station adopt figure 2 The power grid frequency regulation scheme in the present invention is shown.

[0031] Taking the inverter station as an example, the control parameters D=20pu, T=0.035s, K=1.25MW / kV, ΔP=1MW, ΔP M =ΔP M '=30MW.

[0032] Such as image 3 As shown, measure the three-phase ...

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Abstract

The invention aims to need a power grid frequency-modulating method based on a flexible direct-current transmission system. On the basis of a synchronous motor simulation control strategy of a convertor station, the power grid frequency-modulating method based on the flexible direct-current transmission system comprises the following steps: (1), obtaining an instruction value omega* of output alternating voltage angular frequency of the convertor station; (2), obtaining an instruction value theta of a phase angle of alternating voltage; (3), setting an instruction value of output active power P* of the convertor station; (4), enabling an active power set value to be equal to an active power practical value; and (5), inhibiting transmission of large disturbance between interconnected power grids, and limiting the amplitude of the active power set value. Compared with the prior art, only the variable of the local convertor station is necessary to use; the variable of the opposite convertor station is unnecessary to use; and thus, communication between stations is unnecessary.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a frequency regulation method for a power grid based on a flexible direct current transmission system. Background technique [0002] Voltage Source Converter based High Voltage Direct Current Transmission (VSC-HVDC) technology was proposed by Boon-TeckOoi et al. of McGill University in Canada in 1990. It is a voltage source converter, self-shutoff device and pulse width Modulation (PWM) technology-based new power transmission technology, also known as flexible DC transmission technology, has the advantages of power supply to passive networks, no commutation failure, no communication between converter stations, and easy to form multi-terminal DC system advantages. [0003] As a new generation of DC transmission technology, flexible DC transmission is similar in structure to HVDC, and is still composed of a converter station and a DC transmission line (usually a DC cable). The grid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365Y02E60/60
Inventor 管敏渊张浩夏星航姚建锋刘丰文周平
Owner HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD
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