Distributed power grid

Abstract

The invention relates to the application of distributed power and in particular to a distributed power grid which is a supplement to national power grid by utilizing distributed collection of distributed power, new energy resources and regenerative resources. The distributed power grid includes a plurality of distributed power supply apparatuses. The plurality of distributed power supply apparatuses generate electricity and then adopt parallel integrated DC boost grid-connection so as to form a DC transmission and distribution network. The DC transmission and distribution network directly transmits electricity to terminal users while independent from the AC power distribution network, and/or transmits electricity to terminal users in same lines after connecting to the AC distribution network. The distributed power grid has various forms, flexible combination, can materialize distributed arrangement, and is more conducive to healthy development of ecology. The distributed power grid has small capacity, often an independent small-sized-modular power supply of kilowatts or megawatts, is compatible with the environment, and can be arranged near loads.

Description

Technical field [0001] The invention relates to the field of utilization of distributed power, new energy, and traditional energy, in particular to a distributed power grid that uses distributed collection of distributed power, new energy, and renewable energy to supplement the national grid. Background technique [0002] For many years, the power system has mainly relied on large-scale power plants and ultra-high-voltage long-distance transmission lines to centrally supply power to the center to meet the rapidly increasing power demand. This method requires a long project construction time, is costly, consumes a large amount of primary energy, and affects the ecological environment. On the other hand, the centralized power supply mode has the possibility of a major blackout, which will cause huge economic losses if it occurs. Several major blackouts at home and abroad in recent years have proved this. Therefore, distributed generation (DG) technology that uses clean energy such...

AI Technical Summary

Problems solved by technology

At present, in our country, the transmission channel of any level and capacity of power is the national grid. From large-scale thermal power, nuclear power, hydropower, to wind power, solar energy, biomass, gas power plants, etc., as long as they are transmitted through the grid, there is only one national grid. As a result, there is only one standard for online power supply requirements. For distributed power sources that have emerged in recent years, such as wind power, solar power, and biomass power generation, the original power generation and stand-alone capacity are small, and the result must be passed. The channel of the national grid is transmitted to the user terminal, so it must meet the requirements of the grid standard, and therefore it will cost a lot of extra money to carry out a series of complicated alternating processes such as inverter, but in the end, the grid is still calling "garbage electricity" The harm caused by the power grid also repels and resists the distributed power grid access

For distributed power wind power and solar power generation, it is a large area and a large number of "abandoning wind and light", so that the wind power stations and solar power stations that spend a lot of money are idle, resulting in a de facto waste of resources. Users bear the price they should not bear

In this sense, both the power plant and the power grid are victims, and they have endless complaints; on the other hand, as ordinary consumers, their daily consumption is purely resistive loads such as light bulbs and induction cookers. 220v, or 230v, or 240v, frequency 50Hz, or 45Hz, 55Hz, will not bring too much impact and harm to their quality of life, but because of the exclusive power supply, it has an absolute monopoly position. In addition, grid scheduling sounds very The intelligence is advanced, but its actual technical means still remain at the level of manual scheduling decision-making. Therefore, it is almost impossible to subdivide electricity prices and reduce electricity prices for such a huge system.

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