Longitudinally and transversely arranged gridding alternating current and direct current hybrid power distribution network and control method and maintenance method thereof

Abstract

The invention discloses a longitudinally and transversely arranged gridding alternating current and direct current hybrid power distribution network, which comprises a transversely arranged AC line and a longitudinally arranged DC line, a transverter is arranged at a cross point needing AC / DC power exchange, the AC line is connected with a power transmission network power supply and an AC load, and the DC line is connected with a distributed power generation power supply and a DC load. The AC line and the DC line are both provided with a plurality of circuit breakers, and the connection branch between each converter and the AC line and the connection branch between each converter and the DC line are also provided with circuit breakers. Voltage distribution and load bearing capacity of an original alternating-current line are effectively improved, power supply quality is improved, power supply corridor configuration is flexible, and the problem of shortage of power supply corridors during capacity increasing of a current power distribution network is effectively relieved; a conversion link required during grid-connected operation of the load, the distributed power supply and the energy storage equipment is simplified, the utilization rate is increased, and the overall energy efficiency of the system is improved; the power supply reliability is very high; and the expandability is good.

Description

Technical field [0001] The present invention belongs to the technical field of new energy distribution networks, and specifically, the present invention relates to a vertical and horizontal arrangement of gridized DC mixing distribution network and its control method and maintenance method. Background technique [0002] As the urban electricity load is rising, the scale of urban grid is getting bigger and bigger. Especially in recent years, the ultra-high temperature weather is often frequent, and the major urban grids have experienced rare high temperatures, large load power supply, power grid safety production, etc., the strength, density, and reliability requirements of power grid are increasing high. The planning of the city center area is difficult to meet the development requirements of urban power grid, mainly as: the user load level and power supply density continue to rise, the load equipment is increasing on the supply quality requirements, the new load and distributed ...

AI Technical Summary

Problems solved by technology

The planning of the distribution network in the urban central area has been difficult to meet the development requirements of the urban power grid. The main manifestations are: the user load level and power supply density continue to increase, load equipment has increasingly high requirements for power supply quality, and new loads and distributed power generation are gradually integrated; existing The site layout is unreasonable, the overhead line or cable channel is congested, and the transmission capacity of the line is poor; the reconstruction and expansion of the substation is restricted by land, capital, environment, etc.; the level of power distribution operation management and automation is lagging behind, and the control ability is weak; etc.

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