Multi-source power supply system of digital iron tower on-line monitoring device based on three-port commutation

Abstract

The invention discloses a multi-source power supply system of a digital iron tower on-line monitoring device based on three-port commutation. The system comprises a photovoltaic power generation unit, a wind power generation unit, a snap ring power taking unit and an energy storage unit; and the system comprises a three-port DC-DC converter. The photovoltaic power generation unit, the wind power generation unit and the snap ring power taking unit are connected with the DC bus through a DC-DC converter, a first AC-DC converter and a second AC-DC converter respectively. The direct current bus is connected with the three-port DC-DC converter. The energy storage unit is connected with the three-port DC-DC converter, and the three-port DC-DC converter is connected with a DC load. The three-port DC-DC converter is connected with the energy storage control circuit. According to the system, a multi-source power supply mode is adopted, renewable energy sources are preferentially adopted for power generation and power supply, battery energy storage serves as standby, load power is smoothed and instantaneous power is supported by introducing the energy storage unit, the power supply reliability of the digital iron tower and the utilization rate of electric energy can be greatly improved, the design cost is reduced, and centralized control is achieved.

Description

technical field [0001] The invention relates to the technical field of power transmission tower power supply, in particular to a multi-source power supply system for a digital tower online monitoring device based on three-port commutation. Background technique [0002] Transmission line inspection has always required a lot of manpower and material resources, and safety accidents are prone to occur during the inspection process, resulting in huge loss of life and property. As an important supporting unit of transmission lines, transmission towers are particularly important for their safety, stability and operating status. Applied in transmission towers, equipment such as breakage monitoring and early warning, conductor icing monitoring, and micro-meteorological monitoring need to be equipped with sufficient power supply, and the main terminal equipment is powered by low-voltage direct current. At present, the power supply mode of the transmission tower uses a separately conn...

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Problems solved by technology

[0003] The construction of transmission tower power supply devices generally involves issues such as distributed power generation, power conversion, busbar voltage control, and grid-connected technology. However, for PV panel-only power supply devices, its shortcomings are more obvious

On the one hand, photovoltaic power generation has the problem of intermittent and unstable power supply. The single supply source cannot effectively and continuously supply power to the load, and the large difference between day and night loads may easily lead to unstable bus voltage; on the other hand, PV panel power supply During the on-site installation and operation of the device, an excessively large area is required, and the installation is difficult, and the later operation and maintenance are complicated, which greatly increases the investment cost

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