Alternating-direct current series-parallel port distribution network and comprehensive dispatching control method thereof

Abstract

The invention discloses an alternating-direct current series-parallel port distribution network and a comprehensive dispatching control method thereof, and belongs to the field of port distribution power and distribution network automation. The distribution network comprises a general step-down station, a branch substation or a switch-on / switch-off station and various distribution subsystems; a multi-channel feeder of the general step-down station provides alternating current power for the various distribution subsystems through the branch substation or the switch-on / switch-off station; each distribution subsystem comprises a shore electronic system, a shore bridge subsystem, a field bridge subsystem, a power charging and converting station subsystem for electric port trailers, a new energy subsystem and a production life subsystem; each distribution subsystem utilizes an alternating current distribution transformer and an AC / DC converter to construct a direct current bus of the distribution subsystem, and the direct current buses of the distribution subsystems are in direct current interconnection through direct current interconnection protection switches; each distribution subsystem is internally provided with multiple sections of direct current buses, and the multiple sections of direct current buses are in direct current interconnection through direct current interconnection protection switches. According to the alternating-direct current series-parallel port distribution network and the comprehensive dispatching control method thereof, the optimal power supply and comprehensive dispatching control of the port distribution network can be achieved.

Description

technical field [0001] The invention belongs to the field of port power distribution and distribution network automation, and in particular relates to a port AC-DC hybrid distribution network and its comprehensive dispatching control method. Background technique [0002] At present, the energy-consuming equipment in the port mainly includes vertical operation equipment such as shore / field bridges, horizontal operation equipment such as trailers, ships in port, auxiliary production equipment and living equipment, etc. At present, the shore / yard bridge has gradually carried out oil-to-electricity conversion, which has reduced the impact on the environment and carbon emissions, and is in line with the development orientation of a green port. However, most of the ships and trailers that call at the port still use fossil energy as fuel, and the environmental pollution and carbon emissions are in a relatively serious situation, which seriously affects the greening process of the p...

AI Technical Summary

Problems solved by technology

However, the port distribution network using AC power distribution has the following limitations: 1. The design value of the load simultaneous rate of the port AC distribution network is too high, resulting in a large distribution design margin, and the distribution network capacity-to-load ratio (capacity to load ratio) is relatively high, and the basic electricity tariff of ports that adopt basic capacity electricity tariff accounting is relatively high; 2. The simultaneous rate of electricity consumption in the actual operation of the port is low, and the utilization rate of some operating equipment is low; 3. With the promotion of shore power and electric trailers , there is a demand for capacity increase in some ports' power distribution capacity; 4. AC-DC-AC is mainly used for accessing and absorbing new energy sources such as photovoltaics, which is uneconomical and losses in multiple links; 5. Power consumption The load rate is low, and the loss rate of distribution transformers is high; 6. The port distribution network is difficult to operate in parallel, unable to effectively cope with peak power consumption, and the improvement of reliability is facing a bottleneck; 7. The port distribution network has a large power load and short circuit The degree of failure is serious; 8. There are certain power quality problems in the port distribution network; 9. The controllability of the power grid is poor, and the power flow is determined by the inherent impedance of the circuit, which cannot achieve reasonable dispatch

[0005] From the perspective of port equipment, the following problems are still faced: 1. During port operations, a large number of random and large-capacity impact loads are input, and the active power flow of the power supply presents rapid fluctuations; 2. The current shore / yard bridge potential energy feedback utilization system is mainly Adopting the method of energy storage feedback, the energy storage investment cost is high and the payback period is long; 3. The recovered potential energy of the quay / field bridge potential energy feedback utilization system needs to go through the link of entering and exiting the energy storage, and there is a certain conversion loss; 4. The existing distribution system The energy-saving level of electric transformers is low, and the problem of large no-load loss is also more prominent

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