Flexible direct current transmission converter station topology with trouble isolation capability
A flexible direct current transmission and fault isolation technology, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve the problems of large loss, complicated control, and increased cost of converter stations, and achieve the goal of reducing loss and cost Effect
Inactive Publication Date: 2016-06-29
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
However, the control is more complicated, and the subunit capacitor voltage balance is more difficult
Although the full bridge sub-module (FBSM) also has DC blocking capability, the loss is large during normal operation, and the cost of the converter station is significantly increased
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0026] Such as Figure 4 As shown, the traditional flexible HVDC converter station consists of a positive DC bus 17 and a negative DC bus 18, an A-phase one-leg cascaded structure 21, a B-phase two-bridge cascaded structure 23, and a C-phase two-bridge cascaded structure 25. A phase two-bridge cascade structure 22, a B-phase two-bridge cascade structure 24, and a C-phase two-bridge cascade structure 26.
[0027] One end of the A-phase one-bridge cascade structure 21 is connected to one end of the A-phase two-bridge cascade structure 22, and one end of the B-phase one-bridge cascade structure 23 is connected to one end of the B-phase two-bridge cascade structure 24, One end of the C-phase one-bridge cascaded structure 25 is connected to one end of the C-phase two-bridge cascaded structure 26 . The other end of the A-phase one-bridge cascaded s...
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The invention provides a flexible direct current transmission converter station topology with trouble isolation capability. The flexible direct current transmission converter station topology is characterized in that adding a first direct current fault isolation module (9) and a second direct current fault isolation module (10) in a traditional flexible direct current transmission converter station; one leading-out terminal of the first direct current fault isolation module and a positive direct current bus are connected at a first connecting point; the other three leading-out terminals of the first direct current fault isolation module are respectively connected with an A-phase one-bridge arm cascade structure, a B-phase one-bridge arm cascade structure and a C-phase one-bridge arm cascade structure of the traditional flexible direct current transmission converter station at second, third and fourth connecting points; one leading-out terminal of the second direct current fault isolation module and a negative direct current bus are connected at a fifth connecting point; and the other three leading-out terminals of the second direct current fault isolation module are respectively connected with an A-phase two-bridge arm cascade structure, a B-phase two-bridge arm cascade structure and a C-phase two-bridge arm cascade structure of the traditional flexible direct current transmission converter station at sixth, seventh and eighth connecting points.
Description
technical field [0001] The invention relates to a topology of a flexible direct current transmission converter station. Background technique [0002] Due to its unique advantages, DC transmission based on voltage source conversion has broad application prospects in the fields of clean new energy grid connection, urban power transmission and distribution capacity expansion, and offshore isolated load transmission. Based on the modular multilevel converter (MMC), due to the cascaded form of half-bridge sub-modules, it has low requirements for consistent triggering of devices and dynamic voltage equalization, good scalability, high-quality output voltage waveform, and low switching frequency. Many advantages such as low operating loss have become the mainstream trend of current converter selection. However, this structure has the inherent defect that it cannot effectively deal with DC faults. When a fault occurs on the DC side, the anti-parallel freewheeling diodes of the ful...
Claims
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IPC IPC(8): H02J1/00
Inventor 韦统振朱晋吴理心霍群海韩立博张桐硕
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI