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A Hybrid Multiport Railway Power Converter and Its Power Coordinated Control Method

A power converter and multi-port technology, applied in the direction of reducing/preventing power oscillation, reactive power compensation, AC network voltage adjustment, etc. Insufficient consideration of fluctuations and other issues, to achieve the effect of improving power supply reliability, rapid and accurate response, and suppressing voltage fluctuations

Active Publication Date: 2021-05-25
新源智储能源发展(北京)有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, in order to improve the compensation capacity, multiple railway power conditioners and a structure based on modular multilevel converters have been proposed. Reactive power and negative-sequence compensation, but failed to achieve efficient centralized access to large-scale new energy and coordinated energy management control, insufficient consideration of the suppression of grid voltage fluctuations

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  • A Hybrid Multiport Railway Power Converter and Its Power Coordinated Control Method

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Embodiment Construction

[0028] figure 1 The multi-port railway power conditioner shown consists of three parts, the front stage is as figure 1 The multi-module parallel back-to-back H-bridge PWM rectifier shown in (b) is connected to the two-phase power supply arm through two multi-winding transformers; the intermediate stage is as follows figure 1 As shown in (c), it is composed of multiple single-phase isolated DC / DC converters, the high-voltage side capacitors are connected in series, and then connected to the DC bus of a single back-to-back H-bridge PWM rectifier module, and the low-voltage side capacitors are connected in parallel. The first-level DC microgrid is mainly for power transmission, electrical isolation and voltage level matching; the latter stage is a DC microgrid, and new energy power generation systems (photovoltaic) and energy storage systems can be connected to the bus. Suppose P in The total power input for the new energy power generation system, P La and P Lb Indicates the ...

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Abstract

The invention discloses a hybrid multi-port railway power converter and its power coordination control method. Firstly, according to the power provided by the new energy source and the load power, the power to be compensated by the railway power regulator is calculated, so that the three-phase traction network can achieve active power balance ;Secondly, the front-stage back-to-back PWM rectifier adopts improved virtual synchronous machine control to realize negative-sequence and reactive power compensation, stabilize the high-voltage side series DC voltage, and at the same time suppress the grid voltage fluctuation and improve the reliability of the traction network power supply; finally, the intermediate stage The DC / DC converter adopts a stable low-voltage bus voltage, and simultaneously controls the voltage and power balance of the high-voltage series terminal, and introduces variable parameter control according to the small signal model to enhance the dynamic performance of the control system and improve the adaptability of control parameters.

Description

technical field [0001] The invention relates to the technical field of electrified railways, in particular to a hybrid multi-port railway power converter and a power coordination control method thereof. Background technique [0002] In recent years, China's railways have made great progress. my country has become the country with the longest operating mileage of high-speed railways and the largest scale of construction in the world. The "four vertical and four horizontal" high-speed railway networks in China are basically fully connected, and the high-speed railway network has already begun. scale. Subsequently, the problem of negative sequence in electrified railway has become increasingly prominent. The railway power conditioner (RPC) is effective in suppressing the voltage fluctuation and three-phase voltage imbalance of the traction power supply system, compensating harmonics and low voltage of the traction network and other power quality problems, and it is an effective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/16
CPCH02J3/16H02J3/24Y02E40/30
Inventor 马伏军刘一锋朱真汪鑫
Owner 新源智储能源发展(北京)有限公司
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