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Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system

A technology of power transmission system and flexible DC, which is applied in the field of power transmission and transformation, can solve problems such as the failure to improve the level of DC fault ride-through of flexible DC and DC bus voltage fluctuations, so as to improve the ability of AC fault ride-through, avoid equipment lock-up, reduce The effect of small fault currents

Inactive Publication Date: 2012-12-12
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies have serious limitations, and they have not been able to improve the level of flexible DC-AC fault ride-through and suppress DC bus voltage fluctuations.

Method used

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  • Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system
  • Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system

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Embodiment Construction

[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] In this implementation mode, the transmission capacity of the flexible DC transmission system is 100MW, and the DC bus voltage is ±220KV, such as figure 1 As shown, the flexible direct current transmission system power grid fault ride-through control device of this embodiment includes a switchable braking resistor unit 1, a power voltage adjustment unit 2, a full-bridge braking unit 3, a detection unit 4 and a control unit 5; the device is connected to To the flexible DC transmission system, the system includes a three-phase grid 8, a rectifier terminal 6 and an inverter terminal 7;

[0030] The switchable braking resistor unit 1 is connected in series on the DC bus of the inverter terminal 7 of the flexible DC transmission system, the power voltage regulation unit 2 is connected in parallel on the DC bus of the inverter terminal 7...

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Abstract

A device for controlling fault ride-through of a power grid of a flexible direct-current transmission system comprises a control unit, a detection unit, a switchable braking resistor unit, a power voltage regulation unit and a full-bridge braking unit, wherein the switchable braking resistor unit is used for primary power release of output of a rectification end, the power voltage regulation unit is used for secondary power release of output of the switchable braking resistor unit, and the full-bridge braking unit is used for tertiary power release of output of an inversion end. By a method for controlling fault ride-through of the power grid of the flexible direct-current transmission system, direct-current side busbar voltage and alternating-current side busbar voltage are detected in the real time, and when a fault signal is detected, a direct-current change-over switch is switched off, and a second fully-controlled switch is switched on to dynamically enable a first fully-controlled switch to be on for dynamic voltage regulation, so that maximum residual power transmission is achieved. The method is capable of effectively inhibiting overvoltage of a direct-current busbar, avoiding latching of devices of the direct-current transmission system and guaranteeing maximum residual power transmission, and the devices of the direct-current transmission system can be normally operated during fault.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to a power grid fault ride-through control device and method for a flexible DC power transmission system. Background technique [0002] For flexible DC power transmission, in order not to affect the stable operation environment of the AC grid and the safety and reliability of the DC equipment itself, it is required that when the grid has a serious grid voltage drop fault (such as a three-phase short-circuit fault, etc.), the DC transmission equipment should not be damaged as much as possible. Fault blocking, DC fault blocking and re-investment after fault recovery will have a great impact on the entire AC-DC parallel system, and at the same time, the damage to the flexible DC transmission system is also huge. Therefore, it is required that the flexible DC transmission system can continue to operate when a fault occurs, and realize the fault ride-through...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60
Inventor 徐建源李家珏张明理齐伟夫
Owner SHENYANG POLYTECHNIC UNIV
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