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Transient voltage control method and device for extra-high voltage hybrid direct current power transmission system

A technology of transient voltage control and hybrid DC, which is applied in the direction of power transmission AC network, reducing/preventing power oscillation, etc., and can solve problems such as endangering the insulation safety of equipment

Active Publication Date: 2022-04-19
XJ ELECTRIC +1
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  • Application Information

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Problems solved by technology

During the rapid power-up process of the system, due to the effect of line inductance, the rectification station pole bus voltage may reach 1.25 times (the reference value is 800kV, a typical value), or even higher, endangering the insulation safety of equipment

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  • Transient voltage control method and device for extra-high voltage hybrid direct current power transmission system
  • Transient voltage control method and device for extra-high voltage hybrid direct current power transmission system
  • Transient voltage control method and device for extra-high voltage hybrid direct current power transmission system

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Embodiment Construction

[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0044] figure 1 It is the topological structure diagram of the UHV hybrid direct current transmission system provided by the present invention. The rectifier station (sending end) of the UHV hybrid DC transmission system is the same as the conventional UHV, including the line commutation converter (LCC), the LCC valve group is connected in parallel with a DC filter (DCF), and the AC input end is provided with a grounded ...

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Abstract

The invention relates to a transient voltage control method and device for an extra-high voltage hybrid direct-current power transmission system, and the method comprises the steps: superposing an LCC direct-current voltage reference value Udcref outputted by superior control with a voltage regulation variable delta UdcLCC processed by a transient voltage controller, and outputting a final LCC direct-current voltage reference value; the difference between the actual direct-current voltage value UdcLCC and the final LCC direct-current voltage reference value is input into a PI controller for adjustment, and a trigger angle cosine value is output; and outputting the trigger angle of the inverter station through anti-cosine calculation. According to the method, after an alternating current system fault is cleared, an LCC transient voltage controller properly reduces a voltage reference value according to a VSC overvoltage condition and a direct current line voltage drop, so that an inverter station LCC operates at low voltage in a system recovery process, and the system pole bus overvoltage is limited.

Description

technical field [0001] The invention relates to the technical field of ultra-high voltage direct current transmission, in particular to a method and device for controlling transient voltage of an ultra-high voltage hybrid direct current transmission system. Background technique [0002] The conventional UHVDC transmission system uses the grid commutation converter LCC, which has the defect that the commutation failure of the inverter side causes the system transmission power to be interrupted. For the UHV hybrid DC transmission system, the inverter station generally uses a voltage source converter VSC or a combined topology of LCC and VSC. The voltage source converter has the advantages of no commutation failure, independent control of active power and reactive power, and no need to configure AC filters. The hybrid cascaded topology of LCC and VSC in the inverter station can prevent commutation failure and suppress system power interruption caused by commutation failure to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/36H02J3/24Y02E60/60
Inventor 彭忠曹森李泰赵静荆雪记胡永昌苏进国李艳梅张艳浩肖龙申帅华鲁庆华孙攀磊程晓磊李玉龙
Owner XJ ELECTRIC
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