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Commutation failure prevention coordinated control method and system under extra-high-voltage hierarchical access

A technology of commutation failure and layered access, which is applied in the direction of electrical components, can solve problems such as inability to effectively suppress commutation failure and slow startup

Inactive Publication Date: 2019-03-26
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a commutation failure prevention coordination control method and system under UHV layered access mode, aiming to solve the problem of traditional single-layer commutation under UHV layered access mode. Failure predictive control prevents commutation failure of non-faulty layer inverter valve group, because the startup is too slow to effectively suppress the problem of commutation failure

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  • Commutation failure prevention coordinated control method and system under extra-high-voltage hierarchical access
  • Commutation failure prevention coordinated control method and system under extra-high-voltage hierarchical access
  • Commutation failure prevention coordinated control method and system under extra-high-voltage hierarchical access

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specific Embodiment 1

[0090] In the embodiment of the present invention, the low-voltage commutation busbar can be a 500kV commutation busbar; the high-voltage commutation busbar can be a 1000kV commutation busbar.

[0091] In the embodiment of the present invention, the fault layer refers to a faulty high-voltage AC system or a low-voltage AC system, and the non-fault layer refers to a fault-free high-voltage AC system or low-voltage AC system. For example, when the high-voltage AC system fails, the high-voltage AC system is the fault layer, and the low-voltage AC system is the non-fault layer; when the low-voltage AC system fails, the low-voltage AC system is the fault layer, and the high-voltage AC system is the non-fault layer.

[0092] like figure 1 As shown, an embodiment of the present invention provides a commutation failure prevention and coordination control method under UHV hierarchical access, including:

[0093] Step A:

[0094] The voltage access module obtains the instantaneous va...

specific Embodiment 2

[0150] like figure 2 As shown, the embodiment of the present invention provides a commutation failure prevention coordinated control system under UHV layered access, including a voltage access module, a first commutation failure prevention controller of the low-voltage inverter valve group, a high-voltage inverter The second commutation failure prevention controller, low-pressure coordinated controller, high-pressure coordinated controller, XOR logic element, low-voltage trigger control system, and high-pressure trigger control system of the variable valve group, among which:

[0151] The voltage access module is connected to the first commutation failure prevention controller and the second commutation failure prevention controller respectively;

[0152] The first commutation failure prevention controller is connected to the second commutation failure prevention controller, the low-voltage coordinating controller, the XOR logic element, and the low-voltage trigger control sys...

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Abstract

The invention discloses a commutation failure prevention coordinated control method and system under extra-high-voltage hierarchical access. The system comprises a voltage access module, a first commutation failure prevention controller of a low-voltage inverter valve group, a second commutation failure prevention controller of a high-voltage inverter valve group, a low-voltage coordination controller, a high-voltage coordination controller, an exclusive OR logic original piece, low-voltage trigger control system, and a high-voltage trigger control system. On the basis of coordinated controlling, after a failure occurs at a one layer of system, the start-up time of a commutation failure prevention controller of a non-faulty inverter valve group is advanced to be identical with start-up time of a commutation failure prevention controller of a faulty inverter valve group to realize simultaneous triggering of the two controllers, so that the commutation failure suppression effect of the non-faulty inverter valve group is improved effectively under the condition of symmetric and asymmetric faults.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a commutation failure prevention coordination control method and system under UHV layered access. Background technique [0002] In recent years, with the continuous development of new energy power generation technology, UHV DC transmission has become a relatively mature and reliable technology that can economically realize large-capacity and long-distance transmission of electric energy, which is conducive to the realization of large-scale energy bases in my country and clean energy such as photovoltaics and wind power. Efficient use of energy. With the completion and operation of more and more UHV DC transmission projects in the eastern and central power grids, the receiving-end AC system in the eastern and central regions has gradually evolved into a multi-infeed DC access system. In order to solve the problems caused by multi-infeed DC, a new access method of UH...

Claims

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Application Information

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IPC IPC(8): H02J5/00
CPCH02J5/00
Inventor 饶宇飞李程昊姚伟张振安崔惟高泽王建波田春笋潘雪晴谭阳琛张伟晨文劲宇
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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