A deep water power supply device based on three-level inverter

Abstract

The invention discloses a deep-water power supply device based on a three-level inverter, which is arranged in a main base station on the seabed, and is used to convert the high-voltage direct current transmitted from the shore-based power supply to the main base station on the seabed through a submarine cable into medium-voltage electric energy. The deep water power supply device includes: a DC commutation module, a first main power conversion module, a second main power conversion module and a multi-functional load; wherein, the DC commutation module is used to receive double-terminal shore-based power and transmit it through a submarine cable The bidirectional high-voltage direct current is input into the first main power conversion module and the second main power conversion module in sequence after the input current is commutated; the first main power conversion module and the second main power conversion module are used for the input DC high voltage is used for power conversion to output DC medium voltage, which are respectively input to the multifunctional load and the main base station control cabin; the multifunctional load is used to keep the deep water power supply device running at a constant power, and is also used to control Do a self-test.

Description

technical field [0001] The invention belongs to the technical field of seabed observation network, and in particular relates to a deep-water power supply device based on a three-level inverter. Background technique [0002] Due to the constraints of energy and communication bandwidth, traditional ocean observation cannot conduct long-term, continuous, multi-element, and comprehensive observation of the ocean. Therefore, a submarine observation network using modern submarine communication technology was proposed. The submarine observation network connects upward to shore-based power supply and communication equipment and downward to various submarine observation equipment through shore base stations, submarine cables, submarine main base stations, repeaters and other equipment, realizing high-power continuous power supply and observation of submarine observation equipment Real-time online acquisition of data. Therefore, the advantage of the submarine observation network is t...

AI Technical Summary

Problems solved by technology

The advantage is that the withstand voltage of a single module is low and the power is small. After cascading, it can achieve high withstand voltage and high power. The disadvantage is that each module must have an independent transformer to achieve high voltage isolation. The total volume of the power supply is large and the loss is large. , less power efficient

[0006] In addition, as the power consumption of the main underwater base station increases, the power supply voltage gradually increases, and the impact of load changes on the fluctuation of the underwater power supply network gradually increases. Excessive voltage fluctuations will affect the stability of the entire power grid.

Existing devices generally do not pay attention to the impact of load fluctuations on the stability of the entire power supply network

[0007] In summary, due to the extremely difficult deployment and maintenance of equipment such as underwater power supplies, the existing deep-water high-voltage and high-power power supply solutions cannot meet the increasing performance requirements of the submarine observation network. The shortcomings are as follows:

[0008] 1. With the expansion of the scale of the submarine observation network and the increase of the power supply demand, the power supply voltage will be further increased, and the voltage stress of the switching device of the main power circuit will be insufficient, which will affect the reliability of the deep-water high-voltage high-power power supply

[0009] 2. The problem of pressure resistance can be solved by cascading continuous expansion, but the volume of the main power conversion part will continue to increase, which is limited by the volume of the pressure chamber of the submarine equipment, and at the same time the total loss increases and the power supply efficiency decreases

[0010] 3. With the continuous increase of the load power of the main base station, the dynamic change of the high-power load will cause serious fluctuations in the underwater high-voltage power supply network, which will seriously affect the power supply stability of the equipment on the entire underwater power supply network, which is not conducive to the submarine observation network system reliable work

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