Power unit secondary circuit topology and method supporting automatic detection
A power unit, automatic detection technology, applied in the output power conversion device, the conversion of AC power input to DC power output, power supply testing and other directions, can solve the problems of power unit batch detection, maintenance difficulties, etc. The effect of detection efficiency
Active Publication Date: 2020-05-26
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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[0005] In order to solve the problem of difficult batch detection and maintenance of the above-mentioned power units, and to ensure the efficiency and safety of maintenance, the present invention proposes a power unit secondary circuit topology that supports automatic detection. This topology supports the power unit when the valve tower is powered off. Batch inspection can test the communication between the converter valve and the valve control, and the inspection is carried out under low pressure. During the inspection, workers can go on the valve at any time
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[0027] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0028] like figure 1 As shown, the schematic diagram of the full-bridge power unit is composed of upper tubes T1, T2, lower tubes T3, T4, and capacitor C. The secondary circuit topology of the power unit that supports automatic detection is composed of two parts: the energy harvesting control part and the 4 IGBT drivers. .
[0029] The secondary IGBT driving circuit of the power unit is equipped with a driving board for each power switching element (IGBT): the IGBT driving board H1 can trigger the on and off of T1, and feed back the working state of T1 through the optical fiber; similarly, the IGBT The driver board L1 can trigger the on-off of T3 and feedback the working status of T3; the IGBT driver board H2 can trigger the on-off of T2 and feedback the working status of T2; the IGBT driver board L2 can trigger the on-off of T4 ...
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The invention provides a power unit secondary circuit topology and method supporting automatic detection. The circuit topology comprises an energy taking control part and four IGBT driving parts, wherein the four IGBT driving parts are used for equipping a first upper tube T1, a second upper tube T2, a first lower tube T3 and a second lower tube T4 in a power unit with a driving board card respectively; the energy taking control part comprises an energy taking power supply part, a rechargeable battery, an external power supply interface, an AD sampling part, a control logic part, a wireless module and a unit sensor interface. The circuit topology is suitable for occasions with power unit power-down batch maintenance requirements, and is especially suitable for occasions with a large numberof power units and inconvenient power unit dismounting, such as flexible DC power transmission. The topology supports batch detection of the power units when a valve tower is powered down, communication between a converter valve and a valve controller can be detected, detection is carried out under low pressure, and workers can mount the valve at any time during detection. The detection efficiency is improved, and the safety of the maintenance personnel is ensured.
Description
technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a power unit secondary circuit topology and method supporting automatic detection. Background technique [0002] Modular multilevel converter valves are widely used in engineering fields such as flexible direct current transmission and static var compensation. In recent years, with the continuous commissioning of projects, the number of projects requiring maintenance and repair has continued to increase. One of the characteristics of the modular multi-level converter valve is that the power unit sub-module is the smallest controllable unit, and the valve tower is formed by cascading many power units, and then the converter valve is formed. Therefore, for the converter valve, the focus of maintenance and repair is on the power unit. [0003] In the current project put into operation, the power unit is mainly composed of capacitors, power devices (IGBT...
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IPC IPC(8): H02M7/5387G01R31/42
CPCH02M7/5387G01R31/42
Inventor 严治勇梁家豪杨学广陶敏焦石赖桂森梁梓贤吕茵徐涵陈明洁张磊
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION