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Low-voltage shore power supply system and control method thereof

A shore power supply and control method technology, applied in the direction of electrical components, harmonic reduction devices, power transmission AC networks, etc., can solve problems such as waste of time, ship load loss, video ship work efficiency, etc., to achieve strong robustness, Good dynamic performance, the effect of improving power utilization efficiency and dynamic response speed

Inactive Publication Date: 2021-05-11
NANJING UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using shore power, it is often necessary for the ship to cut off the power first and then connect to the shore power after docking, which not only wastes time, affects the working efficiency of the ship, but also causes loss of ship load

Method used

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  • Low-voltage shore power supply system and control method thereof
  • Low-voltage shore power supply system and control method thereof
  • Low-voltage shore power supply system and control method thereof

Examples

Experimental program
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Embodiment 1

[0049] Such as figure 1 As shown, a low-voltage shore power supply system includes: a grid-side rectifier, a grid-side inverter, and a measurement control module; the input end of the grid-side rectifier is connected to the grid, and the output end is connected in parallel with a filter capacitor and a grid-side inverter The grid-side rectifier includes a three-phase voltage PWM rectifier; the grid-side inverter includes a sequentially connected three-phase voltage PWM inverter, a filter reactor and an isolation transformer; the measurement control module includes sequentially connected Voltage and current measurement module, coordinate conversion module, sliding mode variable structure control module, output voltage control module and SVPWM module; the detection end of the voltage and current measurement module is connected to the output end of the isolation transformer, and the output end of the SVPWM module is connected to the three The phase voltage type PWM inverter is co...

Embodiment 2

[0051]Based on the low-voltage shore power system described in Embodiment 1, this embodiment provides a control method for the low-voltage shore power system, including: real-time measurement of ship-side voltage, ship-side current, grid-side voltage, and grid-side power flow, obtain the first measured value; based on the first measured value, lock the ship's side running angle and the measured voltage amplitude, start the operation with the ship's side running angle as the starting angle, and the voltage amplitude as the output voltage of the grid side rectifier, and into the ship power system; based on the first measured value, the real-time three-phase active power value and the real-time three-phase reactive power value are obtained, and the first measured value is converted from the three-phase static coordinate system value to the two-phase static value through coordinate transformation The value of the coordinate system is used as the second measurement value; the second...

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Abstract

The invention discloses a low-voltage shore power supply system and a control method thereof in the technical field of shore power supply control. The input end of a grid-side rectifier is connected with a power grid, and the output end of the grid-side rectifier is connected with a filter capacitor and a grid-side inverter in parallel; the grid-side rectifier comprises a three-phase voltage type PWM rectifier. The grid-side inverter comprises a three-phase voltage type PWM inverter, a filter reactor and an isolation transformer which are connected in sequence; a measurement control module comprises a voltage and current measurement module, a coordinate conversion module, a sliding mode variable structure control module, an output voltage control module and an SVPWM (Space Vector Pulse Width Modulation) module which are connected in sequence; a detection end of the voltage and current measurement module is connected with the output end of the isolation transformer, and the output end of the SVPWM module is connected with the three-phase voltage type PWM inverter; and the output end of the isolation transformer is connected with a ship power utilization system. Frequency conversion output and seamless grid connection can be achieved, the electric energy utilization efficiency and the dynamic response speed are effectively improved, and high-quality electric energy is provided for ships.

Description

technical field [0001] The invention belongs to the technical field of shore power supply control, and in particular relates to a low-voltage shore power supply system and a control method thereof. Background technique [0002] Nowadays, domestic and foreign trade exchanges are very frequent. Maritime transportation with ships as the main body has become the most important means of transportation for maritime trade exchanges due to its low transportation cost and huge transportation volume. 80% of the transportation share has a decisive impact on the development of global trade and the maritime transportation industry. At the same time, sea transportation has also resulted in serious environmental pollution problems. The fuel of marine diesel generators is mostly light or heavy diesel, which will produce a large amount of sulfur oxides, nitrogen oxides, volatile toxic gases and various particulate pollutants when generating electricity. It is directly discharged into the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/34H02J3/01H02M5/458
CPCH02J3/06H02J3/34H02J3/01H02M5/4585Y02E40/40
Inventor 岳东杨昆窦春霞张智俊丁孝华李延满赵景涛罗剑波
Owner NANJING UNIV OF POSTS & TELECOMM
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