Pulse DC supply and AC speed-regulating electric locomotive
An electric locomotive, pulsating DC technology, applied in the direction of AC motor control, AC induction motor traction, electrical components, etc., can solve the problems of low voltage level at the end of the catenary, unbalanced power system load, and electric locomotive can not run.
Inactive Publication Date: 2012-06-20
BEIJING JIAOTONG UNIV
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Problems solved by technology
At present, the main problems of this power supply method are: 1. Since the 25KV power frequency single-phase AC load is an asymmetric load for the power system, it causes the load imbalance of the power system, and the negative sequence component is relatively large.
3. The voltage level at the end of the catenary is low, which limits the high-speed and heavy-duty driving of trains
But a new problem arises, that is, the electric locomotives of my country's current electrified railways are powered by 25KV power frequency alternating current, and such electric locomotives cannot run on the electrified railways of the traction power supply system powered by pulsating DC
Method used
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[0014] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] The topological structure of the traction main circuit of the pulsating DC power supply AC speed-regulating electric locomotive disclosed by the present invention is as follows: figure 1 As shown, it includes: pantograph 0, circuit breaker 1, current limiting reactor 2, DC capacitor 3, converter valve assembly 4, converter reactor 5, high-pass filter 6, three-phase AC asynchronous motor 7, locomotive wheel 8 and PWM control system 9.
[0016] Pantograph 0, circuit breaker 1, current-limiting reactor 2, DC capacitor 3 and locomotive wheel 8 are connected in series in series and connected to the pulsating DC power supply between the pulsating DC traction network and the rail; two converter valves Components 4 are connected i...
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The invention discloses a pulse DC supply and AC speed-regulating electric locomotive which comprises a main traction circuit, wherein the main traction circuit comprises a pantograph, a circuit breaker, a current-limiting reactor, a DC capacitor, converter valve components, current conversion reactors, high-pass filters, a three-phase AC asynchronous motor, locomotive wheels and a PWM control system, wherein the pantograph, the circuit breaker, the current-limiting reactor, the DC capacitor and the locomotive wheels are sequentially connected in series and then switched into a pulse DC powersupply between a pulse DC traction network and a railway track; two converter valve components are connected in series to form a branch, and three branches are connected with the DC capacitor in parallel; midpoints of the three branches are connected with three input ends of the three-phase asynchronous motor through three current conversion reactors; and three high-pass filters are connected with three input ends of the three-phase asynchronous motor in a star shape. The electric locomotive of the invention can normally operate on an electric railway of a pulse DC traction power supply system.
Description
technical field [0001] The invention relates to the field of electrified railway electric locomotives, in particular to an electric locomotive with pulsating DC power supply and AC speed regulation. Background technique [0002] my country's electrified railways use 25KV power frequency single-phase AC power supply, and the power comes from the power system. The power system voltage is generally 220KV (or 110KV). The three-phase 220KV (or 110KV) AC power of the power system is converted into two single-phase 25KV AC power through the traction substation, and then supplies power to the catenary (rated voltage 25KV) in the up and down directions of the railway. At present, the main problems of this power supply method are: 1. Since the 25KV power frequency single-phase AC load is an asymmetrical load for the power system, the load of the power system is unbalanced, and the negative sequence component is relatively large. 2. The voltage phases of the catenary (also known as t...
Claims
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IPC IPC(8): B60L9/22H02P27/08
Inventor 刘平竹
Owner BEIJING JIAOTONG UNIV