Start-up control method and control system of mmc converter based on droop control

A start-up control and inverter technology, applied in output power conversion devices, power transmission AC networks, electrical components, etc., can solve problems such as system shocks and instability, avoid system oscillation, and avoid triggering system protection. , the effect of strong anti-disturbance ability

Active Publication Date: 2020-02-21
XJ ELECTRIC +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, this control strategy only proposes the islanding conversion of the system under steady-state operation, without considering the possible shock and instability during the start-up process of the system.

Method used

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  • Start-up control method and control system of mmc converter based on droop control
  • Start-up control method and control system of mmc converter based on droop control
  • Start-up control method and control system of mmc converter based on droop control

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] Embodiment of start control method

[0043] Such as figure 2 As shown, it is a schematic flow chart of the start-up control method of the MMC converter based on droop control provided by the present invention, which specifically includes the following steps:

[0044] (1) Charge the sub-module in the MMC converter so that the voltage of the sub-module reaches the rated voltage value;

[0045] (2) Determine whether the system is an active network, if it is an active network, continue to start control; if it is a passive network, directly unlock and start the MMC converter;

[0046] (3) If the system is an active network, then calculate the grid-side voltage phase value, denoted as θ g , in this embodiment, the grid-side voltage phase value is obtained by phase-locking the grid-side voltage of the converter. Of course, the calculation of the grid-side...

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Abstract

The invention relates to a start control method and system of an MMC converter based on droop control. A sub module is charged, and a sub module voltage is made to reach a rated voltage value; when a system is an active network, a network side voltage phase value is calculated, an error value of a set phase value and the network side voltage phase value is calculated, the error value is assigned to an additional phase integrator as an initial value, and an additional phase value of a phase is calculated; according to an unlocking signal, the converter is unlocked, and start is accomplished. The start control method is applicable to a flexible straight non-switching island-network control strategy, the phase is compensated through a phase compensation mode during start, the phase is made to satisfy requirements, the converter is made to smoothly enter a stable state, smooth start of the converter is realized, and impact generated in a start process is reduced; overvoltage and leg overcurrent phenomena do not generate in the start process, and the converter is made to realize rapid stable operation.

Description

technical field [0001] The invention belongs to the technical field of starting control of MMC converters. Background technique [0002] Voltage source converter type DC transmission (VSC-HVDC) adopts power electronic devices that can be shut down, and can realize phase commutation without external power supply. It has traditional DC transmission systems such as independent control of active and reactive power, and power supply to weak grids and passive networks. Does not have the function. Flexible DC transmission technology has expanded the application fields of DC transmission, such as figure 1 As shown in , it is a typical flexible DC power transmission system. In addition to its application in traditional grid interconnection, it can also be applied to supply power to remote areas, such as offshore islands. [0003] When the AC grid connected to the converter station is an active network, the converter station and the synchronous generator will run in parallel, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M1/36
CPCH02J3/36H02M1/36Y02E60/60
Inventor 阙波胡丁文李继红朱承治姚晖张劲俞恩科陆翌裘鹏乔敏
Owner XJ ELECTRIC
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