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mmc‑hvdc system black start load input method and system

An MMC-HVDC, black-start technology, applied in the field of MMC-HVDC system black-start load input, can solve the problems of AC system frequency shock and low frequency stability, and achieve the effect of high frequency stability and avoidance of shock

Active Publication Date: 2018-02-13
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

However, if the one-time input load is too large, it is easy to cause a large impact on the frequency of the AC system, so the frequency stability is low

Method used

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  • mmc‑hvdc system black start load input method and system
  • mmc‑hvdc system black start load input method and system
  • mmc‑hvdc system black start load input method and system

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Embodiment Construction

[0028] refer to figure 1 , the MMC-HVDC system black start load input method in an embodiment of the present invention includes the following steps.

[0029] S110: Obtain the rated transmission active power of the MMC-HVDC system.

[0030] The rated transmission active power of the MMC-HVDC system is the load that needs to be put into the passive side of the MMC-HVDC system, which can be set according to the needs of the AC system at the receiving end.

[0031] S130: Obtain the number of groups and time intervals required for inputting loads on the passive side of the MMC-HVDC system.

[0032] The number of groups refers to the number of load inputs to the passive side of the MMC-HVDC system. The number of groups and the time interval are used to group loads into time series, and can be freely set according to the condition that the passive side can accept power at one time while ensuring the stability of the grid frequency.

[0033] In one of the embodiments, step S130 inc...

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Abstract

The invention relates to an MMC-HVDC system black-start load investment method. The method comprises the steps that rated transmission active power of an MMC-HVDC system is acquired; required number of groups and time interval of load investment of the passive side of the MMC-HVDC system are acquired; according to the number of groups and rated transmission active power, investment power required by each group of load investment is acquired; whether the passive side of the MMC-HVDC system meets a preset load investment condition is judged; and if so, according to the time interval, the number of groups and the investment power, loads are invested into the passive side of the MMC-HVDC system until all rated transmission active power are invested. Sub-grouped and sub-sequenced load investment is carried out on an MMC-HVDC black-start process. The impact of excessive one-time investment on alternating current system frequency and voltage is avoided. The frequency stability is high.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a black start load input method and system for an MMC-HVDC system. Background technique [0002] The MMC-HVDC system is a modular multilevel converter-type high-voltage direct current transmission system, which uses power electronic devices that can be switched off for commutation and can automatically commutate phases. The MMC-HVDC system can work in a passive inverter mode without additional commutation voltage. Therefore, when using the MMC-HVDC system, the receiving end system can be a passive network, which overcomes the fundamental defect that the receiving end system of the traditional DC transmission system must be an active network, and can speed up the recovery of the system in the initial stage of the black start phase of the power grid. [0003] The traditional method of adding loads during the black start of the power grid is usually to put the loads in once aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/14
CPCY02B70/3225Y02E60/60Y04S20/222
Inventor 赵睿柳勇军涂亮徐光虎林峰
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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