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Strategy and system of direct current active charging under passive starting

A technology of active charging and DC voltage, applied in the direction of power transmission and AC network, it can solve the problems of large capacitor voltage fluctuation, sub-module voltage overrun, damping module bypass, etc., to achieve fast and accurate response and reduce voltage fluctuations.

Active Publication Date: 2017-12-08
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method controls the number of DC active charging input sub-modules according to the change of sub-module voltage. Since the capacitor voltage changes slowly, it is difficult to achieve a relatively fast and accurate capacitor voltage response by controlling the number of DC active charging input sub-modules, resulting in sub-module capacitance The voltage fluctuates greatly, and there is a possibility that the voltage of individual sub-modules may exceed the limit and cause the adjacent damping module to bypass

Method used

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  • Strategy and system of direct current active charging under passive starting

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Embodiment 1

[0018] Such as figure 1 A DC active charging strategy is shown, which includes:

[0019] The active end enters AC charging, and the DC voltage is V1. At this time, the number of DC active charging sub-modules at the passive end is V1 / V SMR , the V SMR Rated voltage for the sub-module;

[0020] The active end step-down is unlocked, the DC voltage is V2, and the passive end bridge arm current and sub-module voltage V are detected SM , if the arm current>I 1 And the sub-module voltage V SM >V SMmin , then the number of passive DC active charging sub-modules is V2 / V SMR , otherwise, the number of passive DC active charging sub-modules remains unchanged; the V SMmin is the lower limit value of the sub-module voltage, the I 1 The bridge arm current value adjusted for the number of passive-end DC active charging sub-modules triggered in the step-down unlocking mode;

[0021] The active end is fully voltage unlocked, the DC voltage is V3, and the detection sub-module voltage ...

Embodiment 2

[0023] A DC active charging system comprising:

[0024] Active end AC charging module: The active end performs AC charging, and its DC voltage is V1. At this time, the number of passive end DC active charging sub-modules is V1 / V SMR , the V SMR Rated voltage for the sub-module;

[0025] Active end step-down unlocking module: the active end performs step-down unlocking, its DC voltage is V2, and the passive end bridge arm current and sub-module voltage V are detected SM , if the passive bridge arm current>I 1 and the submodule voltage V SM >V SMmin , then the number of passive DC active charging sub-modules is V2 / V SMR , otherwise, the number of passive DC active charging sub-modules remains unchanged; the V SMmin is the lower limit value of the sub-module voltage, the I 1 The bridge arm current value adjusted for the number of passive-end DC active charging sub-modules triggered in the step-down unlocking mode;

[0026] Full-voltage unlocking module at the active end: ...

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Abstract

The present invention discloses a strategy and system of direct current active charging under passive starting. The critical problem of current direct current active charging is realizing rapid and accurate response of submodule capacitor voltage. The technical scheme of the invention comprises: an active terminal enters alternating current charging, direct current voltage is V1, the number of direct current active charging submodules of a passive terminal is V1 / VSMR, and the VSMR is the rated voltage of submodules; the active terminal performs voltage reduction unlocking, the direct current voltage is V2, the bridge arm current and the submodule voltage VSM of the passive terminal are detected, if the bridge arm current is larger than I1 and the submodule voltage VSM is larger than VSMmin, the number of the direct current active charging submodules of the passive terminal is V2 / VSMR, or else, the number of the direct current active charging submodules of the passive terminal remains unchanged; the active terminal performs total-voltage unlocking, the direct current voltage is V3, the submodule voltage VSM is detected, if VSM>VSMmax, the number of the direct current active charging submodules of the passive terminal is V3 / VSMR, or else, the number of the direct current active charging submodules remains unchanged. The strategy and system of direct current active charging under passive starting realizes rapid and accurate response of submodule capacitor voltage.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a direct current active charging strategy and system capable of realizing fast and accurate response of sub-module capacitor voltage. Background technique [0002] In the flexible DC power transmission project, the capacitor of the passive terminal module is charged through the active terminal, and the voltage of the sub-module can only be charged to half of the rated voltage at most. When the active terminal is unlocked, a very large DC overcurrent will be generated. Therefore, it must pass The DC active charging strategy charges the sub-module voltage to the rated value. [0003] During passive startup, the DC active charging process can be divided into three stages: the active end AC charging stage (DC voltage V1), the active end step-down unlocking stage (DC voltage V2) and the active end full voltage unlocking stage (DC voltage V1). voltage V3)....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 陈骞陆翌裘鹏童凯宣佳卓许烽虞海泓王柯
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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