CN111596150A - Full-load experimental system of subway capacitor energy storage type braking energy absorption device - Google Patents
Full-load experimental system of subway capacitor energy storage type braking energy absorption device Download PDFInfo
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- CN111596150A CN111596150A CN202010355878.2A CN202010355878A CN111596150A CN 111596150 A CN111596150 A CN 111596150A CN 202010355878 A CN202010355878 A CN 202010355878A CN 111596150 A CN111596150 A CN 111596150A
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Abstract
A full-load experiment system of a subway capacitor energy storage type braking energy absorption device comprises an accompanying experiment system and a tested system. The test accompanying system comprises an alternating current power grid, a direct current power supply and a direct current bus, wherein an input port of the direct current power supply is connected with the alternating current power grid, and an output port of the direct current power supply is connected with the direct current bus; the system to be tested comprises a first capacitive energy storage device and a second capacitive energy storage device, the first capacitive energy storage device and the second capacitive energy storage device are connected through a direct current bus, and the first capacitive energy storage device and the second capacitive energy storage device are sequentially connected to an alternating current power grid through the direct current bus and a direct current power supply. The invention only consumes the electric quantity when the whole system works, the consumed electric quantity is greatly reduced, the experiment cost is greatly reduced, the full-load aging experiment of at least two capacitive energy storage devices can be realized simultaneously, and the experiment efficiency is improved.
Description
Technical Field
The invention relates to the field of urban rail transit, in particular to a full-load experiment system of a subway capacitor energy storage type braking energy absorption device.
Background
At present, the absorption modes of subway regenerative braking energy mainly comprise a resistance energy consumption type, an energy feedback type, a capacitance energy storage type and the like. The resistance energy consumption type is a mode applied in the early stage, the mode consumes energy in train braking on a resistor, the mode wastes energy and increases environment-control heat dissipation burden, and the application field of braking energy absorption is gradually exited. The energy feedback type is that braking energy is fed back to an alternating current power grid in an inversion mode, so that energy recycling can be realized, energy is saved, the environment is protected, and the energy feedback type is a subway braking energy absorption mode which is applied more at present. However, this method requires the power feeding device to be connected to the ac power grid, and inevitably injects certain harmonics into the ac power grid during operation. The capacitive energy storage type is a braking energy absorption mode developed in recent years, and the mode is that braking energy is stored in a capacitor when a train brakes, and the braking energy is released for train traction when the train pulls. The energy storage device only needs to be connected with a direct-current traction power grid, has the characteristics of energy conservation and environmental protection without influencing an alternating-current power grid, and is increasingly applied to the field of subway braking energy absorption.
With the increasing application of the capacitive energy storage type braking energy absorption device in the field of subways, how to improve the manufacturing capability of the energy storage device is a problem that various manufacturers in China need to think. In the factory test items of the capacitive energy storage device, the performance of the equipment can be effectively tested through the test items of rated voltage and rated power, and the reliability and stability of the equipment can be fully verified. At present, a general test method is to use a bidirectional converter (AD/DC) as a DC power supply, and a capacitive energy storage device is connected to a DC side of the bidirectional converter. When the capacitor is charged, the bidirectional converter works in a controllable rectification mode, and energy is transferred from a power grid to the capacitor; when the capacitor discharges, the bidirectional converter works in an inversion mode, and energy returns to the power grid from the capacitor. The test method is characterized in that a bidirectional converter serving as a direct-current power supply, a power grid and a tested capacitive energy storage device are required to have the same power grade, generally a few MW grades, so that the capacity of the accompanying machine and the capacity of the power grid are required to be large, the direct-current power supply needs to meet the requirement of bidirectional energy flow, and the requirement on the direct-current power supply is high. And secondly, when the capacitor is discharged, energy returns to the alternating current power grid, if the inside of the company can not be normally consumed, the energy returns to the upper-level power grid, the returned electric energy is not metered by the electric power company, and only the electric energy consumed in a single direction is counted, so that the electric energy consumed by the MW-level capacitive energy storage device if the load running test is carried out under full power is huge. In summary, the investment cost of the manufacturing enterprise for the factory test of the capacitive energy storage device is very huge.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a full-load experimental system of a subway capacitor energy storage type braking energy absorption device.
A full-load experiment system of a subway capacitor energy storage type braking energy absorption device comprises an accompanying experiment system and a tested system. The test accompanying system comprises an alternating current power grid, a direct current power supply and a direct current bus, wherein an input port of the direct current power supply is connected with the alternating current power grid, and an output port of the direct current power supply is connected with the direct current bus; the system to be tested comprises a first capacitive energy storage device and a second capacitive energy storage device, the first capacitive energy storage device and the second capacitive energy storage device are connected through a direct current bus, and the first capacitive energy storage device and the second capacitive energy storage device are sequentially connected to an alternating current power grid through the direct current bus and a direct current power supply.
The experimental method of the full-load experimental system based on the subway capacitor energy storage type braking energy absorption device is realized by the following steps:
a) energy transfer: enabling the direct-current power supply to be in a disconnected state, enabling the first capacitive energy storage device to be in a discharging state, enabling the second capacitive energy storage device to be in a charging state, enabling the duration time to be T1, and enabling energy to flow from the first capacitive energy storage device to the second capacitive energy storage device through the direct-current bus;
b) intermittent shutdown: enabling the direct-current power supply to be in a disconnected state, enabling the first capacitive energy storage device and the second capacitive energy storage device to be in a shutdown state, and enabling the duration to be T2;
c) energy transfer: enabling the direct-current power supply to be in a disconnected state, enabling the first capacitive energy storage device to be in a charging state, enabling the second capacitive energy storage device to be in a discharging state, enabling the duration time to be T1, and enabling energy to flow from the second capacitive energy storage device to the first capacitive energy storage device through the direct-current bus;
d) energy supplement: the experimental steps a), b) and c) are carried out in a circulating and reciprocating mode in sequence, the tested system has loss, after a plurality of circulating pairs are charged, the total electric quantity stored by the two tested capacitor energy storage devices is reduced, and energy is supplemented after the total electric quantity is smaller than a set value; the DC power supply is in a closed state, the AC power grid supplements the capacitive energy storage device with higher residual capacity to a full-power state with smaller charging power through the DC power supply, and energy is charged to one tested capacitive energy storage device through the DC power supply;
e) entering the next reciprocating cycle: after the energy supplement is finished, the cycle of the experiment steps a), b) and c) is started again, the energy is supplemented through the experiment step d) after the total electric quantity is smaller than a set value, and the cycle is repeated in sequence, so that the intermittent full-load aging experiment for completely simulating the actual working condition of the site of the capacitive energy storage device is realized.
The invention has the beneficial effects that: the energy exchange under the rated power of the invention is between two tested capacitor energy storage devices, but not between the tested capacitor energy storage devices and the power grid, and the requirement on the capacity of the power grid and the direct current power supply is very low. The knowledge of the invention needs to be taken from an alternating current power grid when supplementing energy, the energy does not need to be fed back to an experimental power grid, a front-stage direct current power supply does not need to be a bidirectional converter, and only simple uncontrolled rectification is needed, so that the requirement on the direct current power supply is greatly reduced. The electric quantity consumed in the invention is only the loss of the whole system during working, and compared with the prior experimental method of directly using a power grid and a bidirectional converter (direct current power supply), the electric quantity consumed in the invention is greatly reduced, and the experimental cost is greatly reduced. The invention can simultaneously realize the full-load aging test of at least two capacitive energy storage devices and improve the test efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a full-load test system of a subway capacitor energy storage type braking energy absorption device of the invention;
fig. 2 is a schematic diagram of an experimental method of a full-load experimental system of the subway capacitor energy storage type braking energy absorption device of the invention.
In the figure: 1 alternating current power grid, 2 accompanying and testing systems, 3 direct current power supplies, 4 direct current buses, 5 tested systems, 6 first capacitive energy storage devices and 7 second capacitive energy storage devices.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a schematic structural diagram of a full-load test system of the subway capacitor energy storage type braking energy absorption device of the present invention is provided, and the full-load test system of the subway capacitor energy storage type braking energy absorption device includes an accompanying test system 2 and a tested system 5. The accompanying and testing system 2 comprises an alternating current power grid 1, a direct current power supply 3 and a direct current bus 4, wherein an input port of the direct current power supply 3 is connected with the alternating current power grid 1, and an output port of the direct current power supply 3 is connected with the direct current bus 4. The system to be tested 5 comprises a first capacitive energy storage device 6 and a second capacitive energy storage device 7, the first capacitive energy storage device 6 and the second capacitive energy storage device 7 are connected through a direct current bus 4, and the first capacitive energy storage device 6 and the second capacitive energy storage device 7 are sequentially connected to an alternating current power grid 1 through the direct current bus 4 and a direct current power supply 3.
The capacitive energy storage device on the subway site belongs to an intermittent working system, and generally requires 20s/2 min or 30s/2 min, namely 20s or 30s of rated power working within 2 min.
As shown in fig. 2, a schematic diagram of an experimental method of a full-load experimental system of a subway capacitor energy storage type braking energy absorption device of the present invention is given, and the experimental method of the full-load experimental system of the subway capacitor energy storage type braking energy absorption device can be implemented by the following steps:
a) energy transfer: the direct-current power supply 3 is in a disconnected state, the first capacitive energy storage device 6 is in a discharging state, the second capacitive energy storage device 7 is in a charging state, the duration is T1 and is about 20s or 30s, the time duration used when the subway arrives at a station to brake and park is simulated, and energy flows from the first capacitive energy storage device 6 to the second capacitive energy storage device 7 through the direct-current bus 4; under the working condition, the first capacitive energy storage device 6 works in a voltage stabilization mode to stabilize the direct-current voltage on a target value, and the second capacitive energy storage device 7 works in a constant-current charging mode.
b) Intermittent shutdown: the direct-current power supply 3 is in a disconnected state, the first capacitive energy storage device 6 and the second capacitive energy storage device 7 are both in a shutdown state, the duration is T2, and the simulation is that the shutdown time period is long after the subway arrives at a station.
c) Energy transfer: the direct-current power supply 3 is in a disconnected state, the first capacitive energy storage device 6 is in a charging state, the second capacitive energy storage device 7 is in a discharging state, the duration is T1 and is about 20s or 30s, the simulation is that the time length is used when the subway is pulled and started when the subway is out of the station, and the energy flows from the second capacitive energy storage device 7 to the first capacitive energy storage device 6 through the direct-current bus 4; under the working condition, the first capacitive energy storage device 6 works in a constant-current charging mode, and the second capacitive energy storage device 7 works in a voltage stabilizing mode again to stabilize the direct-current voltage on a target value.
d) Energy supplement: the experimental steps a), b) and c) are carried out in a circulating and reciprocating mode in sequence, the tested system (5) has loss, after a plurality of circulating pairs are charged, the total electric quantity stored by the two tested capacitor energy storage devices is reduced, and energy is supplemented when the total electric quantity is smaller than a set value; the DC power supply (3) is in a closed state, the AC power grid (1) supplements the capacitive energy storage device with higher residual electric quantity to a full-charge state with smaller charging power through the DC power supply (3), and the energy is charged to one tested capacitive energy storage device through the DC power supply (3) from the AC power grid (1) under the working condition.
e) Entering the next reciprocating cycle: after the energy supplement is finished, the cycle of the experiment steps a), b) and c) is started again, the energy is supplemented through the experiment step d) after the total electric quantity is smaller than a set value, and the cycle is repeated in sequence, so that the intermittent full-load aging experiment for completely simulating the actual working condition of the site of the capacitive energy storage device is realized.
Claims (2)
1. The utility model provides a full-load experimental system of subway electric capacity energy storage type braking energy absorbing device which characterized in that: the full-load experiment system of the subway capacitor energy storage type braking energy absorption device comprises an accompanying test system (2) and a tested system (5); the test accompanying system (2) comprises an alternating current power grid (1), a direct current power supply (3) and a direct current bus (4), wherein an input port of the direct current power supply (3) is connected with the alternating current power grid (1), and an output port of the direct current power supply (3) is connected with the direct current bus (4); the system to be tested (5) comprises a first capacitive energy storage device (6) and a second capacitive energy storage device (7), the first capacitive energy storage device (6) and the second capacitive energy storage device (7) are connected through a direct current bus (4), and the first capacitive energy storage device (6) and the second capacitive energy storage device (7) are sequentially connected to an alternating current power grid (1) through the direct current bus (4) and a direct current power supply (3).
2. An experimental method of a full-load experimental system of a subway capacitive energy storage type braking energy absorption device, which is based on the subway capacitive energy storage type braking energy absorption device, is characterized by comprising the following steps:
a) energy transfer: enabling the direct current power supply (3) to be in a disconnected state, enabling the first capacitive energy storage device (6) to be in a discharging state, enabling the second capacitive energy storage device (7) to be in a charging state, enabling the duration time to be T1, and enabling energy to flow from the first capacitive energy storage device (6) to the second capacitive energy storage device (7) through the direct current bus (4);
b) intermittent shutdown: the direct current power supply (3) is in a disconnected state, the first capacitive energy storage device (6) and the second capacitive energy storage device (7) are both in a shutdown state, and the duration is T2;
c) energy transfer: enabling the direct current power supply (3) to be in a disconnected state, enabling the first capacitive energy storage device (6) to be in a charging state, enabling the second capacitive energy storage device (7) to be in a discharging state, enabling the duration time to be T1, and enabling energy to flow from the second capacitive energy storage device (7) to the first capacitive energy storage device (6) through the direct current bus (4);
d) energy supplement: the experimental steps a), b) and c) are carried out in a circulating and reciprocating mode in sequence, the tested system (5) has loss, after a plurality of circulating pairs are charged, the total electric quantity stored by the two tested capacitor energy storage devices is reduced, and energy is supplemented when the total electric quantity is smaller than a set value; the DC power supply (3) is in a closed state, the AC power grid (1) supplements a capacitor energy storage device with higher residual electric quantity to a full-charge state with smaller charging power through the DC power supply (3), and the energy is charged to one tested capacitor energy storage device through the DC power supply (3) from the AC power grid (1);
e) entering the next reciprocating cycle: after the energy supplement is finished, the cycle of the experiment steps a), b) and c) is started again, the energy is supplemented through the experiment step d) after the total electric quantity is smaller than a set value, and the cycle is repeated in sequence, so that the intermittent full-load aging experiment for completely simulating the actual working condition of the site of the capacitive energy storage device is realized.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010355878.2A CN111596150A (en) | 2020-04-29 | 2020-04-29 | Full-load experimental system of subway capacitor energy storage type braking energy absorption device |
| PCT/CN2020/098319 WO2021217844A1 (en) | 2020-04-29 | 2020-06-26 | Full-load experimental system for subway capacitive energy storage type braking energy absorption device |
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| CN202010355878.2A CN111596150A (en) | 2020-04-29 | 2020-04-29 | Full-load experimental system of subway capacitor energy storage type braking energy absorption device |
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| CN114336871B (en) * | 2021-12-31 | 2024-04-12 | 江苏国传电气有限公司 | Elevator emergency power supply deceleration braking control method and device |
| CN115508659A (en) * | 2022-11-16 | 2022-12-23 | 武汉新能源接入装备与技术研究院有限公司 | Opposite-dragging test platform and method for flywheel energy storage system |
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- 2020-04-29 CN CN202010355878.2A patent/CN111596150A/en active Pending
- 2020-06-26 WO PCT/CN2020/098319 patent/WO2021217844A1/en active Application Filing
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Application publication date: 20200828 |