Single-phase four-quadrant power unit for cascade connection with in-phase power supply system
A technology of power unit and in-phase power supply, which is applied to electrical components, output power conversion devices, and AC power input to AC power output. It can solve problems such as high cost, large device capacity, and influence on normal power supply and driving. The effect of high operating voltage, large ripple current, and low equivalent internal resistance ESR
Inactive Publication Date: 2015-12-30
DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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Problems solved by technology
[0005] 1. There are more additional transformers, and the cost is higher
[0006] 2. Because the device and the traction transformer are bound to each other in terms of capacity, when the device is withdrawn, it will affect the normal power supply and driving
[0007] 3. Large device capacity and high cost
Method used
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[0030] A single-phase four-quadrant power unit that can be cascaded and used in the same-phase power supply system of the present invention will be further described below with reference to the accompanying drawings.
[0031] figure 1 It is the schematic diagram of the same-phase power supply compensation converter system, showing the connection relationship of multiple power units in the system. The secondary side of the matching transformer is connected to form a multiple parallel parallel side of the same-phase power supply compensation converter, which is connected to the DC power grid 27.5KV through a parameter of 660V-single-phase 27.5KV single-phase traction transformer; the input series side inverter circuit of multiple power units After being connected in series, multiple cascaded non-phase power supply compensation converters are connected in series, and connected to the inductors L1 and L2, and then connected to the three-phase-single-phase isolation transformer wit...
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The invention relates to a single-phase four-quadrant power unit for cascade connection with an in-phase power supply system. The power unit comprises an input series side inverter circuit, an output parallel side inverter circuit and a DC bus capacitor, wherein the DC bus capacitor is arranged between the input series side inverter circuit and the output parallel side inverter circuit; both the series side inverter circuit and the parallel side inverter circuit adopt single-phase full-bridge inverter circuit structures. The major loop of the power unit adopts a topological structure of a single-phase serial rectification, a DC bus filtering energy storing and single-phase parallel inverting, so as to eliminate a series side booster transformer (an isolation transformer is equipped by a user); moreover, bidirectional flow of energy is realized due to the topological structure, so as to reach the four-quadrant running standard.
Description
technical field [0001] The invention belongs to the technical field of rail transit power electronics, and in particular relates to a single-phase four-quadrant power unit for cascade connection in a same-phase power supply system. Background technique [0002] At present, traction substations of electrified railways in my country are powered from the public power grid, and single-phase power frequency alternating current is generally used to power locomotives. The power system hopes that all loads will use the three-phase symmetrical fundamental current from the power grid, so as to make full use of the capacity of the line and equipment, and reduce the harm of reactive current and harmonic current to the system. In order to meet this requirement, the electrified railway adopts the scheme of phase sequence rotation and phase-by-phase power supply. However, since the traction compliance of each section cannot be the same at any time, the phase separation and segmentation sc...
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Inventor 文俊马劲松赖成毅张黎常瑞彭良平唐斌张川
Owner DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD