Low-voltage inversion superconductive transmission and distribution method of multi-DC voltage grades
A voltage-level, multi-DC technology, applied in the direction of converting DC power input to DC power output, irreversible DC power input into AC power output, and adjusting electrical variables, can solve problems such as benefit discounts and reduce land occupation. Small area, good controllability, and the effect of simplifying the converter equipment
Inactive Publication Date: 2011-01-19
SOUTHEAST UNIV
View PDF3 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Due to the skin effect, the benefits brought by the application of superconducting power transmission to AC power transmission systems will be greatly reduced
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
example
[0031] Such as figure 1 , 2 As shown, the present invention proposes a multi-DC voltage level low-voltage inverter superconducting power transmission and distribution method, which transmits power from a 220kV AC power grid to a substation outside the city, and the substation outside the city is configured as a power transmission side with a 35kV / 3000A The high temperature superconducting DC trunk line is cooled by liquid nitrogen, and thyristor converter valves are used at both ends; the substation outside the city on the power transmission side reduces the 220kV AC power to 35kV AC power through a three-turn step-down transformer, and passes through a common three-phase full-wave rectifier bridge The 12-pulse rectifier connected in series becomes 35kV DC; the substation in the city on the power receiving side adopts multi-stage DC step-down technology to directly step down the high-voltage DC to 5kV through a multi-stage series DC chopper; the substations in the city pass th...
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 provides a low-voltage inversion superconductive transmission and distribution method of multi-DC voltage grades. The method is characterized in that a high-temperature superconductive DC transmission technology is used in an urban power grid. The transmission and distribution method realizes AC voltage-reducing and 12-pulse rectification in an outside-city substation, a DC voltage-reducing technology is adopted, multi-level serial buck choppers are arranged in an in-city substation as a first T-shaped interface and power is provided for users through low-voltage superconductive lines, and a liquid nitrogen cooled high-temperature superconductive DC backbone line of 35 kV / 3000 A is arranged between the outside-city substation and the in-city substation. All in-city substations are mutually connected through superconductive DC transmission lines of 5kV and can form a ring net, and each transmission line is provided with a secondary T-shaped interface for transmitting electricity to the users. In the transmission and distribution method, a PWM (Pulse Width Modulation) technology is adopted so that uses can further carry out low-voltage inversion after further DC voltage reduction to supply power to loads. The novel transmission and distribution method can realize the aims of expanding the transmission capability, saving energy, purifying the power system, reducing the floor area of the power grid and decreasing the investment cost.
Description
technical field [0001] The present invention proposes a brand-new multi-DC voltage level low-voltage inverter superconducting power transmission and distribution method, which is characterized in that: a 35kV / 3000A liquid nitrogen is used to cool the high-temperature superconducting DC trunk line, and thyristor converter valves are used at both ends; The substation outside the city on the power side reduces the 220kV AC power to 35kV AC power through a three-turn step-down transformer, and configures a 12-pulse rectifier valve connected in series with ordinary three-phase full-wave rectifier bridges to make it a 35kV DC power; The substation adopts multi-stage DC step-down technology to directly step down the high-voltage DC to 5kV through multi-stage series DC choppers; the substations in the city are interconnected through 5kV superconducting trunk lines to form a ring network, which serves as a first-level T The substation or the ring network uses a secondary T-shaped inter...
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 IPC IPC(8): H02M3/145H02M7/48H02J13/00
CPCY02E60/723Y04S10/16Y02E60/00
Inventor 陆广香施胜丹王丹凤赵瑜赵申刘海东
Owner SOUTHEAST UNIV