400 kV + 400 kV + 200 kV series +/- 1000 kV DC converter wiring scheme
A converter and solution technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems of increasing the difficulty of transportation, the difficulty of design and manufacture, etc.
Inactive Publication Date: 2010-12-01
北京网联直流工程技术有限公司
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Adopting double converters in series, the capacity and insulation level of the converters are higher than those of previous projects, which not only makes the design and manufacture more difficult, but also increases the difficulty of transportation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] The present invention will be further described below in conjunction with the accompanying drawings and the specific examples completed by the inventor according to the above-mentioned technical solutions.
[0019] In order to ensure that the 12-pulse harmonic at the low-voltage end of each converter is 0 during normal operation, and reduce the insulation level of the valve side of the converter transformer, the smoothing reactor is arranged in three places, and the ratio of the inductance value is 1:2:2. The converter voltage distribution is matched.
[0020] When the 200kV converter fails, the isolation switch S 11 , S 12 Disconnect, S 13 Keep it closed, the DC system wiring is the wiring scheme of the ±800kV DC transmission project, and the insulation level is basically the same. You can refer to the equipment design and manufacturing experience of the ±800kV DC transmission project.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a 400 kV + 400 kV + 200 kV series + / -1000 kV DC converter wiring scheme, belonging to the field of high-voltage DC transmission. The invention aims at solving the problems of difficult design, manufacturing and transmission caused by the cooccurrence of great converter transformer capacity and high insulation level. The invention adopts the technical scheme that a 200 kV converter is selected as a high-end converter, and two 400 kV converters are selected as a middle-end converter and a low-end converter. Smoothing reactors are arranged in three parts, and the inductance ratio of the three smoothing reactors is 1:2:2 and is matched to the voltage distribution of the converters. Thus, the 12-pulsed harmonic wave at the low-voltage end of each converter is ensured to be zero in theory during normal operation, and the insulation level at the valve side of a converter transformer is reduced. After the 200 kV converter fails and is removed, the wiring of the DC system adopts the wiring scheme of + / - 800 kV DC transmission engineering, and the equipment design and the manufacturing experience of the + / -800 kV DC transmission engineering can be referenced.
Description
technical field [0001] The invention belongs to the field of high-voltage direct current transmission and relates to a wiring scheme for a converter of a ±1000kV ultra-high voltage direct current transmission project. Background technique [0002] In my country's conventional HVDC power transmission projects, ETT or LTT thyristors with a diameter of 5 inches and 3000A are mostly used. At present, the 6-inch diameter, 4750A thyristor element has no technical obstacles and can be put into industrial operation. In order to compare with the converter valve using 5-inch thyristors, 2-fold valves and 4-fold valves based on two elements are designed. The calculation shows that the performance of the DC system has been comprehensively improved by using 6-inch thyristors, which can reduce the short-circuit reactance of the converter transformer, reduce the reactive power consumption of the converter and the reactive power configuration of the station. At the same time, the overload...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
Inventor 马为民殷威扬刘宝宏余世峰
Owner 北京网联直流工程技术有限公司