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Island detection and smooth switching control method for two-end flexible direct-current power transmission network

A flexible DC and island detection technology, which is applied in the direction of AC network circuit, power transmission AC network, single network parallel feeding arrangement, etc., can solve the problem of double position, poor contact of auxiliary contact of circuit breaker, and island detector cannot correct state of circuit breaker Judgment and other issues

Active Publication Date: 2020-09-25
GUANGDONG POLYTECHNIC NORMAL UNIV
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Problems solved by technology

Aiming at the problem that the islanding detector cannot correctly judge the state of the circuit breaker due to poor contact of the auxiliary contact of the circuit breaker, or the "double position" of the circuit breaker, a main criterion based on the combination of switch states and the amount of sudden change in voltage are proposed. Integrated Island Detection Method Combining Auxiliary Criterion of Started Pressure Difference Overrun

Method used

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  • Island detection and smooth switching control method for two-end flexible direct-current power transmission network
  • Island detection and smooth switching control method for two-end flexible direct-current power transmission network
  • Island detection and smooth switching control method for two-end flexible direct-current power transmission network

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Embodiment Construction

[0079] The present invention will be further described below in conjunction with specific examples.

[0080] like figure 1As shown, the two-terminal flexible DC transmission network described in this embodiment includes the mainland power grid ACgrid1, the island power grid ACgrid2, the first AC circuit breaker ACCB1, the second AC circuit breaker ACCB2, the third AC circuit breaker ACCB3, and the fourth AC circuit breaker ACCB4, fifth AC circuit breaker ACCB5, sixth AC circuit breaker ACCB6, AC line A L1, AC line B L2, DC line L3, first AC bus #1, second AC bus #2, first DC bus # 3. The second DC bus #4, the first modular multilevel voltage source converter MMC-VSC1, the second modular multilevel voltage source converter MMC-VSC2, the first transformer TM1, the second Transformer TM2, the third transformer TM3, and the fourth transformer TM4; wherein, the mainland power grid ACgrid1 and the island power grid ACgrid2 are connected through two AC channels and one DC channel; t...

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Abstract

The invention discloses an island detection and smooth switching control method for a two-end flexible direct-current power transmission network. The method comprises the following steps of 1) applying an island detection main criterion based on switch state combination; 2) applying an island detection auxiliary criterion of voltage difference out-of-limit based on the voltage break variable start; and 3) operating an island smooth switching control method based on a given current working condition voltage. According to the method, the main criterion based on switch state combination and the island detection auxiliary criterion of voltage difference out-of-limit based on the voltage break variable start are combined to carry out island detection on the two-end flexible direct-current powertransmission network, an island detector is designed, and when the island detector detects an island, the island smooth switching control method of which a reference value is changed from the currentworking condition voltage to a rated value according to a preset slope is designed, so that the island smooth switching control of the two-end flexible direct-current power transmission network is realized.

Description

technical field [0001] The present invention relates to the technical field of a flexible direct current transmission network, in particular to an island detection and smooth switching control method for a two-terminal flexible direct current transmission network. Background technique [0002] Flexible DC transmission technology is a new generation of DC technology based on turn-off devices and pulse width modulation technology. It has independent control that can realize flexible active power and reactive power; it can realize DC power direction reversal without changing the voltage polarity, and is suitable for forming a multi-terminal flexible DC transmission system; it has the ability to supply power to passive network systems; switching frequency Higher, without series output filter; A series of advantages such as static synchronous compensator can be realized. Flexible DC transmission is flexible in control and can perform power transmission tasks between different AC...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38G01R31/08
CPCH02J3/36H02J3/388G01R31/086G01R31/088H02J2203/20Y02E60/60
Inventor 宋伟伟
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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