Centralized Inverter Bus Capacitor Discharging Resistor Energy Saving Control Device

Abstract

The invention provides a centralized inverter bus capacitor discharge resistance energy-saving control device. It solves the problem of low energy utilization rate of photovoltaic power plants in the prior art. The device includes a power board, a first diode D1, a second diode D2, a switch tube Q and a relay KM. The input side of the power board is connected to the output end of the photovoltaic PV module, and the positive output end of the power board is connected to the first The anode of the diode D1 and the gate of the switch Q, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the collector of the switch Q is respectively connected to the anode of the second diode D2 One end of the relay KM coil, the other end of the relay KM coil is connected to the negative electrode of the first diode D1, the emitter of the switch Q is grounded, one end of the contact of the relay KM is connected to the positive electrode of the bus capacitor, and the contact of the relay KM Connect the other end of the bus capacitor discharge resistor. The device has simple circuit, stable and reliable operation, and can effectively improve the energy utilization rate of the photovoltaic power station.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a centralized inverter bus capacitor discharge resistor energy-saving control device. Background technique [0002] China is currently the world's first energy producer and consumer country. Energy demand and supply continue to grow. Vigorously developing renewable energy including photovoltaics has become a national energy transformation trend. National policies continue to support the development and growth of the photovoltaic industry. Among them Including 70GW distributed power stations and 80GW ground centralized power stations. [0003] With the rapid growth of the installed capacity of rooftop distributed photovoltaic power stations, centralized inverters have been widely used as a common model of distributed photovoltaic power stations. An important trend of development. The discharge resistor of the bus capacitor of the centralized inverter is installed on the positi...

AI Technical Summary

Problems solved by technology

The discharge resistor of the busbar capacitor of the centralized inverter is installed on the positive and negative poles of the busbar capacitor. During this long period of time from when the inverter starts to generate electricity in the morning to when the inverter stops to generate electricity in the evening, the discharge resistor is always in the state of working and heating, consuming Photovoltaic energy reduces the utilization rate of photovoltaic energy

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