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Unified power flow control system and method for urban rail transit photovoltaic energy-storage traction power supply

A photovoltaic energy storage and power flow control technology, applied in photovoltaic power generation, AC network load balancing, AC network with the same frequency from different sources, etc.

Active Publication Date: 2019-11-26
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The controller of the inverter feedback device controls the feedback power according to the bus voltage, and has the ability to adjust the voltage to a certain extent, but only in the regenerative feedback state

Method used

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  • Unified power flow control system and method for urban rail transit photovoltaic energy-storage traction power supply
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  • Unified power flow control system and method for urban rail transit photovoltaic energy-storage traction power supply

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Embodiment Construction

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0028] In this example, see figure 1 and figure 2 As shown, the present invention proposes a unified power flow control system for urban rail transit photovoltaic energy storage traction power supply, including a power non-adjustable device and a power adjustable device in the DC traction power supply network of the urban rail transit traction power supply system with photovoltaic energy storage power supply, The power adjustable device controllers of each traction substation participating in the primary regulation, the unified power flow controller participating in the secondary regulation, the economic dispatching plan controller participating in the tertiary regulation, the comprehensive automation subsystem of the traction substation, the central comprehensive monito...

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Abstract

The invention discloses a unified power flow control system and method for urban rail transit photovoltaic energy-storage traction power supply. The system comprises a power adjustable device and a power adjustable device in a DC traction power supply network of an urban rail transit traction power supply system with photovoltaic energy storage power supply, power-adjustable device controller of each traction power substation participating into primary adjusting, a unified power flow controller participating into the secondary adjusting, an economic scheduling plan controller participating into the third adjusting, a traction power substation comprehensive automatic subsystem, a central comprehensive monitoring system, and a communication network. The adjusting on the traction power substation DC bus voltage by the local controller is realized, the optimal power flow distribution of the DC traction network is realized so that the traction network is minimum in power loss and minimum involtage fluctuation, the traction network voltage level is improved, so that the train current at each place can be provided by traction power substations at two sides as much as possible; the economic scheduling plan can determine the power output plans of the adjustable power devices at different time slots, and the pre-charging / discharging plane of the energy-storage device, and the photovoltaic energy storage can be efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of urban rail transit power supply systems, in particular to a unified power flow control system and method for urban rail transit photovoltaic energy storage traction power supply. Background technique [0002] The power of the rectifier units in the traction substations of the existing urban rail DC traction power supply system is not adjustable and uncontrollable. When it is large, the rectifier units of the traction substations on the whole line provide power for the current-taking trains, resulting in long-distance transmission of power and additional power loss, and the long-distance backflow of the train’s current taking also leads to a longer path for stray currents It is more complicated, and there are problems such as high rail potential. [0003] In the current urban rail DC traction power supply system, trains start and brake frequently, and the regenerative braking energy brought by braking is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/32
CPCH02J3/06H02J3/32Y02E70/30Y02E10/56
Inventor 张丽韩春白雪王蓝邓文丽戴朝华
Owner SOUTHWEST JIAOTONG UNIV
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