Inverter, modular solar off-grid and grid-connected system and uninterruptible power supply

Abstract

The invention provides an inverter, a modular solar off-grid and grid-connected system and an uninterruptible power supply, and relates to the technical field of inverters. The inverter can be appliedto the modular solar off-grid and grid-connected system and the uninterruptible power supply. The inverter comprises a power module and an energy-saving switch, wherein the power module is connectedwith a mains supply and a load, and the energy-saving switch is arranged between the power module and the mains supply; the power module is connected with the mains supply through the energy-saving switch, and the energy-saving switch can cut off a connecting loop between the power module and the mains supply so as to prevent the power module from generating reactive power on the mains supply. Theenergy-saving switch is added; conditions are preset, and disconnection is carried out when the preset conditions are met; a connection loop between the power module and the mains supply is cut offthrough the energy-saving switch; the possibility that the power module generates reactive power on the mains supply is fundamentally cut off, and therefore the reactive power generated by the power module on the mains supply is reduced or even avoided.

Description

technical field [0001] The invention relates to the technical field of inverters. Background technique [0002] Solar off-grid systems and uninterruptible power supplies (UPS) are emergency and backup power systems commonly used in many places, and they all have inverters as core components. Taking the solar off-grid system as an example, such as figure 1 As shown, the existing solar off-grid system includes an inverter, a solar module 5, and a battery 4. The inverter includes a bypass module 2 and a power module 1. The bypass module 2 is a unit module that mainly realizes the bypass switching function. , the function is to control the connection or disconnection of the bypass output controllable switch. When the power module is shut down or in standby, the controllable switch of the bypass output module is connected, so that the mains can directly supply power to the load 3 . The power module 1 is a unit module that mainly realizes the power conversion function, and its f...

AI Technical Summary

Problems solved by technology

Power module 1 is in the standby state, and the mains power is still connected. Both the circuit board and the fan are powered on, and the fan continues to work, which will generate power consumption.

In addition, the power module 1 has a filter circuit and other circuits with reactance. Even in the standby state, reactive power will be generated. At this time, the solar energy does not generate electricity and cannot provide electric energy to the inverter. Active power also incurs electricity bills, and in some countries electricity bills are more expensive for reactive power

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