AC (Alternate Current) complementation method for multipower system

Abstract

The invention discloses an AC (Alternate Current) complementation method for a multipower system. In the AC complementation method, a transformer with a plurality of input ports is used as a power node, wind power and photoelectricity are respectively switched in the input ports of the transformer, grid electricity is switched in other input ports of the transformer, and an output of the transformer is connected with a user or a local area network, so that multipower complementation and power integration are realized at a user side of the transformer, wherein the wind power and the photoelectricity are switched into the transformer in a controlled mode; the grid electricity is switched into the transformer in an uncontrolled mode; the wind power, the photoelectricity and the grid electricity in the multipower system have the same frequency and the same phase; voltage classes of power subsystems can be unequal; and the voltage classes of the power subsystems and a voltage class of the grid electricity can be unequal. The AC complementation method for the multipower system has the significances of locally utilizing wind energy, optical energy and wave energy most conveniently and rapidly and furthest, reducing the requirement of the grid electricity on power capacity and achieving the low-carbon energy-saving and green environmental-friendly effects.

Description

technical field [0001] The invention relates to an AC complementary method of multiple power supply systems, which belongs to the power transmission technology. Background technique [0002] Due to the unstable output of wind energy and solar energy, to make better use of such energy, the existing methods are off-grid and grid-connected; the off-grid solution is to use battery energy storage. The maintenance cost is high, and it cannot be applied in the high-power field; the grid-connected type is limited in application due to the current grid technology and other reasons. Another method is to rectify wind power, photovoltaic and grid power respectively into DC and then reuse it, so as to achieve the purpose of complementing wind power, photovoltaic and grid power on the DC side. This method is more common in low-power systems, due to technical and cost reasons. , which has little practical value in large-capacity systems. SUMMARY OF THE INVENTION [0003] The purpose of...

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Problems solved by technology

[0002] Because the output power of wind energy and solar energy is unstable, to make better use of this kind of energy, the existing methods are off-grid and grid-connected; the off-grid solution is to use battery energy storage, and the investment and The maintenance cost is very high, and it cannot be applied in the high-power field; the grid-connected type is restricted in application due to the current grid technology and other reasons

Another method is to rectify wind power, photovoltaic and grid power into DC and then reuse them to achieve the purpose of complementing wind power, photovoltaic and grid power on the DC side. This method is more common in low-power systems. Due to technical and cost reasons , not much practical value in large-capacity systems

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