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Method for eliminating steady-state voltage deviation of multi-terminal flexible direct-current transmission control system

A DC transmission control, multi-terminal flexible technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as DC voltage deviation, unreasonable active power distribution, and inability to realize flexible adjustment of the system, so as to eliminate steady-state voltage Deviation, to achieve the effect of real-time power adjustment

Active Publication Date: 2021-03-09
XIAN THERMAL POWER RES INST CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-terminal flexible direct current transmission multi-level converter control system using bus voltage-active power (U dc -P) Droop control, in view of the traditional droop control because the fixed droop coefficient cannot realize flexible adjustment of the system, unreasonable active power distribution, DC voltage deviation and other problems, an adaptive droop control scheme is adopted to automatically adjust the droop coefficient according to the voltage deviation, eliminating multi-terminal Steady-state voltage deviation of flexible HVDC control system

Method used

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  • Method for eliminating steady-state voltage deviation of multi-terminal flexible direct-current transmission control system
  • Method for eliminating steady-state voltage deviation of multi-terminal flexible direct-current transmission control system
  • Method for eliminating steady-state voltage deviation of multi-terminal flexible direct-current transmission control system

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Embodiment Construction

[0033] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] Such as figure 1 As shown, a typical cluster wind power MMC-MTDC system is mainly composed of: wind turbines, DC network sending end converter station, grid side receiving end converter station, and DC bus. The number of DC network sending-end converter stations (WFMMC) using MMC is m, and the number of grid receiving-end converter stations (GSMMC) using MMC is n. WFMMC rectifies the power generated by the wind turbine to the DC network. Public Connection Point, PCC) at the confluence, through the DC bus to transmit power to PCC 2 At , n GSMMCs will start from the PCC 2 The distributed electric energy is processed by inversion and transmitted to the grid through the AC transmission line.

[0035] PCC 2 , the GSMMC power transfer equation can be expressed as:

[0036]

[0037] In formula (1): R f 、X f is the resistance va...

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Abstract

The invention discloses a method for eliminating steady-state voltage deviation of a multi-terminal flexible direct-current power transmission control system. The method comprises the following steps:establishing a PCC2 power transmission equation and an alternating-current dynamic equation of a multi-terminal flexible direct-current power transmission MMCMTDC receiving-end converter station GSMMC at a public access point 2; on the basis of a GSMMC power transmission equation, adopting direct-current active voltage droop control to obtain an output error signal expression, wherein the DC active voltage droop control output error signal is 0, and obtaining a DC active voltage droop control equation; establishing a self-adaptive droop coefficient expression according to a GSMMC output errorsignal expression; introducing the self-adaptive droop coefficient expression into a DC active voltage droop control equation to obtain a self-adaptive droop control mathematical model, and introducing self-adaptive droop control into the multi-terminal flexible DC power transmission control system to achieve the purpose of eliminating steady-state voltage deviation. According to the invention, the steady-state voltage deviation of the multi-terminal flexible direct-current transmission control system is eliminated.

Description

technical field [0001] The invention relates to a method for eliminating the steady-state voltage deviation of a multi-terminal flexible direct current transmission control system. The method adopts bus voltage-active power (U dc -P) Droop control, in view of the traditional droop control because the fixed droop coefficient cannot realize flexible adjustment of the system, unreasonable active power distribution, DC voltage deviation and other problems, an adaptive droop control scheme is adopted to automatically adjust the droop coefficient according to the voltage deviation, eliminating multi-terminal Steady-state voltage deviation of flexible HVDC control system. Background technique [0002] With the large-scale integration of renewable energy into the grid, it is necessary to further improve the long-distance and large-capacity power transmission capacity of the grid. Multi-Terminal HVDC (MTDC) system, as one of the reliable technologies for connecting large-scale renew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24H02J3/48
CPCH02J3/36H02J3/24H02J3/48H02J2203/20H02J2300/28Y02E60/60
Inventor 杨沛豪孙钢虎兀鹏越柴琦王小辉寇水潮高峰姜宁郭新宇孙梦瑶李志鹏赵俊博薛磊贺婷郭霞张立松李元钊
Owner XIAN THERMAL POWER RES INST CO LTD
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