Series-parallel connection structure-based modularization subway energy feedback apparatus
An energy feedback, modular technology, applied in output power conversion devices, climate change adaptation, irreversible DC power input conversion to AC power output, etc. Class requirements, no redundant operation capability, etc., to achieve the effect of ensuring achievability, reducing size, and small amplitude
Active Publication Date: 2017-01-04
NANJING APAITEK TECH
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Problems solved by technology
But it is not compatible with DC750 / 1500V applications, and it also cannot flexibly cover the needs of different current levels
[0006] In summary, the above two solutions cannot flexibly meet the needs of various power levels, and there is no redundant operation capability, which has potential reliability risks
Method used
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Embodiment approach 1
[0033] There is only one DC750V inverter module group in the circuit. At this time, the voltage measured by the DC network is 750V. Within the inverter module group, a certain number of DC750V inverter modules can be connected in parallel according to the actual current.
Embodiment approach 2
[0035] There are two groups of DC750V inverter module groups in the circuit. The two groups of inverter module groups are connected in series. At this time, the shared voltage is 1500V. If one inverter module of each group cannot meet the current requirements, a certain number of inverter modules are connected in parallel according to the current. DC750V inverter module.
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The present invention specifically relates to a modularization subway energy feedback apparatus. To overcome a defect in the prior art that various power level requirements cannot be flexibly met, the present invention provides a series-parallel connection structure-based modularization subway energy feedback apparatus. The apparatus comprises: at least one DC750V inverse module group and a boosting transformer. Electric energy feeding into a direct current touch net enters a direct current side of the DC750V inverse module by using a voltage transformer, the DC750V inverse module converts a direct current into a low-voltage alternating current, and the low-voltage alternating current is changed to a middle-voltage alternating current by passing through the boosting transformer and then is fed into a medium-voltage power network. The DC750V inverse module group comprises at least one DC750V inverse module, and an alternating current output end of the DC750V inverse module is connected to the boosting transformer. The apparatus can flexibly cover different current level requirements with a voltage of DC750 or 1500V, and can perform redundancy running and improve reliability.
Description
Technical field [0001] The invention relates to the technical field of urban rail transit power supply systems, in particular to a modular subway energy feedback device. Background technique [0002] In recent years, my country's urban rail transit has developed very rapidly. The existing subway traction power supply method uses diode rectifier units to rectify 35 / 33kV medium voltage AC power into 1500V DC, and supplies power to the traction motors on subway trains through DC catenary. However, this power supply mode can only realize a one-way power flow from the grid to the motor, and the motor works in the generator state during the braking process, and the mechanical energy of the train is converted into electrical energy. In order to ensure that the DC catenary voltage is within a safe range, the resistance power consumption method is basically used to absorb the electric energy generated by train braking, resulting in a great waste of electric energy. The heat generated by t...
Claims
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IPC IPC(8): H02J3/38H02M7/49
CPCH02J3/38H02M7/49H02M7/4835Y02A30/60
Inventor 仇志凌芮国强李锦胡磊磊张明许忠元陈蕾刘定坤葛文海
Owner NANJING APAITEK TECH
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