Pulse width modulation shore power system power control method for large ship

A technology of pulse width modulation and power control, applied in the field of control, can solve the problems that VF-DPC is difficult to implement in batches, destroys the principle of polarity consistency, and the design of variable switching frequency is difficult, so as to realize the design of variable switching frequency, The effect of maintaining the principle of polarity consistency and good load adaptability

Pending Publication Date: 2019-11-22
SHANGHAI MUNICIPAL ELECTRIC POWER CO
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the well-known disadvantages of the VF-DPC scheme are: variable switching frequency design difficulty, violation of polarity consistency principle, digital implementation of hysteretic comparator requires high sampling frequency, requires fast microprocessor and A / D converter
Therefore, VF-DPC is difficult to implement in batches in industry

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pulse width modulation shore power system power control method for large ship
  • Pulse width modulation shore power system power control method for large ship
  • Pulse width modulation shore power system power control method for large ship

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] According to the topological circuit diagram of this technical scheme (referring to figure 1 shown in ), designed a switching frequency of 12KHz, reactor impedance of 110mΩ, inductance of 11mH, DC link capacitance of 1.2mF, load resistance of 60Ω, phase voltage of 450V, power supply voltage frequency of 50Hz, and DC side voltage of 550V A pulse width modulated shore power system power control converter for large ships.

[0105] The value of the regulator parameter is K p1 =0.0308,K i1 =0.312,K p2 =0.0614,K i2 =2.48. The simulation results using MATLAB-SIMULINK are shown in image 3 shown in .

Embodiment 2

[0107] According to the topological circuit diagram of this technical scheme (referring to figure 1 shown in ), designed a switching frequency of 12KHz, reactor impedance of 110mΩ, inductance of 11mH, DC link capacitance of 1.2mF, load resistance of 30Ω, phase voltage of 450V, power supply voltage frequency of 50Hz, DC side voltage of 550V A pulse width modulated shore power system power control converter for large ships. The value of the regulator parameter is K p1 =0.0308, K i1 =0.312, K p2 =0.0614,K i2 =2.48. Using MATLAB-SIMULINK for simulation, the results are shown in Figure 4 shown in .

[0108] Simulation results show that the DC side voltage can reach a steady state of 450V within 0.15s, which is faster than traditional PWM modulation.

[0109] obviously, image 3 and Figure 4 It shows that when the load resistance on the DC side changes, the line current changes accordingly and adapts to the power. The simulation observations are in good agreement with the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a pulse width modulation shore power system power control method for a large ship, and belongs to the field of control. Space vector modulation direct power control is adopted,and the switching state of a converter is generated by an SV-PWM modulator block with constant switching frequency; the variable switching frequency design is adopted, the polarity consistency principle is kept, high sampling frequency does not need to be used for digital implementation of a hysteresis comparator, and a rapid microprocessor and an A / D converter are not needed either; and line current very close to sinusoidal waveform can be provided, and good adjustment of DC-bus voltage is realized through the PI controller. The method has the advantages of simple structure, convenience in PI power and voltage controller adjustment, lower sampling and constant switching frequency, good dynamic performance, high direct-current voltage tracking precision and small total harmonic distortion, and is easy to realize in batch industrially. The method can be widely applied to the field of design and operation management of harbor shore power distribution systems.

Description

technical field [0001] The invention belongs to the field of control, in particular to a power control method for a pulse width modulation shore power system. Background technique [0002] In essence, the shore power system of a ship is a high-power converter. [0003] The converter consists of two parts: a three-phase PWM rectifier and a three-phase PWM inverter. The main function of the converter is to convert the 50Hz electric energy of the power grid into the 60Hz electric energy used by the ship power grid. [0004] The electric energy of the shore power grid is stepped down by the substation, adjusted by the rectifier transformer, rectified and inverted by the converter, filtered by the sine wave filter, and finally sent to the ship's power receiving system through the shore power connection device, and then enters the power distribution network for transmission To the ship's various electrical equipment. [0005] Rectifiers and inverters are the most important equi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02J3/00H02J3/01H02J5/00
CPCH02J3/00H02J3/01H02J5/00Y02E40/40
Inventor 黄潇贻周璿朱一骅赵敏
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap