Railway traction power take-through line power supply
A technology for railway traction and power supply, which is applied in the direction of electrical components, output power conversion devices, and conversion equipment that can be converted to DC without intermediate conversion. It can solve the problems of large voltage fluctuation range, inconsistent power supply quality, and low construction cost. and other problems, to achieve the effect of eliminating three-phase unbalance, ensuring the continuity of power supply, and ensuring the quality of voltage
Active Publication Date: 2018-07-31
XIAN ACTIONPOWER ELECTRIC +1
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Problems solved by technology
This power supply method has low construction cost and low risk of power failure, but affected by railway traffic, the 10kV through-line power supply has defects of three-phase imbalance, large voltage harmonics, and large voltage fluctuation range, and the power supply quality does not meet GB / T12325 "Power Quality According to the provisions of "Power Supply Voltage Deviation", it cannot be used as a backup power supply for self-closing lines
Method used
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[0031] Below in conjunction with accompanying drawing, the present invention is described in detail:
[0032] see figure 1 , the 110kV (or other voltage level voltage) provided by the high-voltage grid 1 passes through the traction transformer 2 to obtain a 27.5kV traction power supply 3, and the through-line purification power supply device 4 performs voltage transformation, voltage stabilization, filtering, and high-voltage and low-voltage coupling processing on the 27.5kV power supply Afterwards, a 10kV AC power supply is provided to the through-wire 5 .
[0033] see figure 2 , 27.5kV (or 55kV) power supply enters the high-voltage switchgear 6, and the high-voltage switchgear 6 is equipped with a high-voltage switch, a relay protection device and a grounding switch, and has a "five-proof" function, which prevents accidental opening and closing of the circuit breaker and prevents electrification On-off isolating switch, anti-charged on-off grounding switch, on-off off-off...
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The invention provides a power supply for railway traction through-lines, which includes a high-voltage switchgear, a transformer, and a medium-voltage circuit sequentially arranged on the current path; the power conversion unit is connected to the medium-voltage circuit through a coupling transformer; The cables are connected with high-voltage switchgear, transformers, medium-voltage circuits, and power conversion units. The present invention takes power from the catenary and provides high-quality three-phase 10kV power supply to the through-line after purification treatment. The input power is obtained from the 27.5kV (or 55kV) AC of the traction catenary of the electrified railway, and then the voltage is stepped down by the transformer. , and then dynamically adjusted and filtered by the voltage source connected in series with the 10kV loop to obtain a stable through-line power supply. It can eliminate the three-phase unbalance, voltage fluctuation and voltage harmonic caused by railway running, and the voltage quality of the output side is guaranteed.
Description
technical field [0001] The invention belongs to the field of electric energy conversion and control of power electronics, and relates to a series-type voltage quality active purification device, in particular to a kind of power-taking from the catenary, which is passed through after undergoing voltage transformation, series voltage stabilization, filtering, and high-low voltage coupling treatment. A device that provides three-phase 10kV high-quality medium-voltage power supply. Background technique [0002] The through-line power supply is used to provide working power to the second and third-level loads along the railway line, and at the same time as a backup power supply for the railway self-closing line. The existing power supply methods for the railway through-line power supply mainly include: 1) Two 10kV power supplies are provided by the local power grid , respectively as a self-closing line and a through-line power supply. This method has good power supply quality, s...
Claims
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IPC IPC(8): H02M5/458H02M5/10
CPCH02M5/10H02M5/4585H02M1/0067
Inventor 李育春张建荣李春龙冯广义王森李宏刚
Owner XIAN ACTIONPOWER ELECTRIC