CN116231781A

CN116231781A - Power plant direct current system battery charging module burnout prevention system

Info

Publication number: CN116231781A
Application number: CN202211609536.4A
Authority: CN
Inventors: 曹伟杰; 张恒毅; 曹欣茹; 杨正; 戴燕; 张昱琪; 顾柳栋
Original assignee: Huaneng Suzhou Thermal Power Co ltd
Current assignee: Huaneng Suzhou Thermal Power Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-06-06

Abstract

The invention relates to the technical field of battery charging, and discloses a burning-out prevention system for a battery charging module of a direct current system of a power plant, which comprises the following components: the power station comprises an acquisition module, a judging module, a detection module, a charging module and a discharging module, wherein the acquisition module is used for acquiring a voltage data value of a bus of a power station in real time, the judging module is used for judging and comparing the voltage data value with a preset voltage value, when the voltage data value is smaller than the preset voltage value, an alternating current input switch of a high-frequency switch is disconnected, the detection module is used for acquiring a load connected with the high-frequency switch, detecting the working state of the load, when the load is in an idle state, starting the alternating current input switch of the high-frequency switch, and the charging module is used for controlling the high-frequency switch to charge a storage battery when the alternating current input switch of the high-frequency switch is started.

Description

Power plant direct current system battery charging module burnout prevention system

Technical Field

The invention relates to the technical field of storage battery charging, in particular to a burnout prevention system for a storage battery charging module of a direct current system of a power plant.

Background

At the power plant, the direct current system provides reliable direct current power for relay protection of a generator set, an automatic device, opening and closing of a circuit breaker and the like. When the accident of power interruption of the whole plant occurs, the power supply provides direct current power for accident lighting, UPS, turbine lubricating oil pump and the like so as to ensure the safe shutdown of the turbine. The direct current system runs reliably and plays a role in ensuring the safe running of the whole power plant, and the direct current system of the power plant generally consists of a storage battery, a charging device, a direct current bus, a switch, a knife switch and other main parts.

When the station service electricity of the power plant is interrupted, the high-frequency switch rectifying device is in voltage loss by the alternating current power supply, the direct current oil pump of the steam pump starts to operate, and the direct current oil pump of the steam induced draft fan starts to operate, so that the power is supplied by the storage battery. When the bus for factory resumes the 380V power supply of the high-frequency switch, the high-frequency switch not only charges the storage battery, but also supplies power to the direct-current load such as the direct-current oil pump, the output current is far beyond the rated capacity of the high-frequency switch, because of the inherent difference of the current limiting function of each module, the overload of part of the modules is serious, and the burning out is caused, meanwhile, because the wire joint or the connecting piece has the oxidation phenomenon, the phenomenon that the equipment has poor contact and the contact resistance becomes large is caused, and the equipment is easy to generate local heat during the heavy-current operation. When an accident happens, the whole plant is in an overload operation state, and a serious local overheating phenomenon occurs, so that the insulation of the wires is damaged, and a non-contact short circuit is caused. After the short circuit occurs, the storage battery discharges through the bus bar, the current is increased sharply, and the heating value is increased sharply, so that the direct current part of the output terminal of the module and the bus bar are fused, and the safety of the main unit equipment is seriously threatened.

Therefore, how to provide a power plant direct current system storage battery charging module burnout prevention system is a technical problem to be solved at present.

Disclosure of Invention

Aiming at the problems existing in the prior art, the invention aims to provide a burning-out prevention system for a storage battery charging module of a direct current system of a power plant.

In order to achieve the above object, the present invention provides a burnout prevention system for a battery charging module of a direct current system of a power plant, comprising:

the acquisition module is used for acquiring voltage data values of the bus of the power plant in real time;

the judging module is used for judging and comparing the voltage data value with a preset voltage value, and switching off an alternating current input switch of the high-frequency switch when the voltage data value is smaller than the preset voltage value;

the detection module is used for acquiring a load connected with the high-frequency switch, detecting the working state of the load, and starting an alternating current input switch of the high-frequency switch when the load is in an idle state;

the charging module is used for controlling the high-frequency switch to charge the storage battery when the alternating-current input switch of the high-frequency switch is turned on;

and the discharging module is used for controlling the storage battery to supply power to the load under the preset condition.

In one embodiment, the judging module is specifically configured to:

and when the voltage data value is smaller than the preset voltage value, generating a tripping protection instruction, and switching off an alternating current input switch of the high-frequency switch based on the tripping protection instruction.

In one embodiment, the acquisition module is further configured to acquire a supply current of the storage battery in real time;

the judging module is also used for judging whether the storage battery is in a normal power supply state according to the relation between the power supply current of the storage battery and the preset power supply current range,

if the power supply current is not in the preset power supply current range, judging that the storage battery is in an abnormal power supply state;

and if the power supply current is within the preset power supply current range, judging that the storage battery is in a normal power supply state.

In one embodiment, the method further comprises:

and the protection module is used for cutting off the connection between the storage battery and the load when the power supply current is not in the preset power supply current range so as to stop the storage battery from supplying power to the load.

In one embodiment, the method further comprises:

and the alarm module is used for generating an alarm signal in real time and alarming when the power supply current is not in the preset power supply current range.

In one embodiment, the method further comprises:

the temperature acquisition module is used for acquiring the temperature of the storage battery when the connection between the storage battery and the load is cut off;

the heat radiation module comprises a heat radiation fan, a setting unit and an executing unit, wherein the heat radiation fan is used for carrying out heat radiation treatment on the storage battery, the setting unit is used for setting a heat radiation instruction for the heat radiation fan according to the temperature of the storage battery, and the executing unit is used for controlling the heat radiation fan according to the heat radiation instruction.

In one embodiment, the setting unit is specifically configured to:

setting the rotation speed and the rotation time of the cooling fan according to the temperature A of the storage battery;

the setting unit is used for presetting a temperature matrix B of the storage battery, and setting B (B1, B2, B3 and B4), wherein B1 is the temperature of a first preset storage battery, B2 is the temperature of a second preset storage battery, B3 is the temperature of a third preset storage battery, B4 is the temperature of a fourth preset storage battery, and B1 is more than B2 and less than B3 and less than B4;

the setting unit is used for presetting a rotation speed matrix C of the cooling fan and setting C (C1, C2, C3, C4 and C5), wherein C1 is a first preset rotation speed, C2 is a second preset rotation speed, C3 is a third preset rotation speed, C4 is a fourth preset rotation speed, C5 is a fifth preset rotation speed, and C1 is more than C2 and less than C3 and less than C4 and less than C5;

the setting unit is used for presetting a rotation time matrix D of the cooling fan and setting D (D1, D2, D3, D4 and D5), wherein D1 is a first preset rotation time, D2 is a second preset rotation time, D3 is a third preset rotation time, D4 is a fourth preset rotation time, D5 is a fifth preset rotation time, D1 is more than D2 is more than D3 is less than D4 is less than D5;

the setting unit is further configured to set a rotation speed and a rotation time of the cooling fan according to a relationship between a temperature a of the storage battery and a temperature of each preset storage battery:

when A is smaller than B1, selecting the first preset rotating speed C1 as the rotating speed of the cooling fan, and selecting the first preset rotating time D1 as the rotating time of the cooling fan;

when B1-A is smaller than B2, selecting the second preset rotating speed C2 as the rotating speed of the cooling fan, and selecting the second preset rotating time D2 as the rotating time of the cooling fan;

when B2 is less than or equal to A and less than B3, selecting the third preset rotating speed C3 as the rotating speed of the cooling fan, and selecting the third preset rotating time D3 as the rotating time of the cooling fan;

when B3 is less than or equal to A and less than B4, selecting the fourth preset rotating speed C4 as the rotating speed of the cooling fan, and selecting the fourth preset rotating time D4 as the rotating time of the cooling fan;

when B4 is less than or equal to A, the fifth preset rotating speed C5 is selected as the rotating speed of the cooling fan, and the fifth preset rotating time D5 is selected as the rotating time of the cooling fan.

In one embodiment, the setting unit sets the rotation speed and the rotation time of the heat radiation fan to i < th > preset rotation speed Ci and i < th > preset rotation time Di, respectively, i=1, 2,3,4,5;

the execution unit controls the acquisition module to acquire the regulating temperature E of the storage battery after controlling the cooling fan according to the ith preset rotating speed Ci and the ith preset rotating time Di;

the judging module judges whether the heat dissipation treatment of the storage battery is required to be continued according to the relation between the regulating temperature E of the storage battery and the preset temperature alpha,

if the regulating temperature E of the storage battery is greater than the preset temperature alpha, the judging module judges that the storage battery needs to be continuously subjected to heat dissipation treatment;

and if the regulating temperature E of the storage battery is smaller than or equal to the preset temperature alpha, the judging module judges that the heat dissipation treatment of the storage battery is not required to be continued.

In one embodiment, when the judging module judges that the heat dissipation process needs to be continued on the storage battery, the setting unit corrects the rotation speed and the rotation time of the heat dissipation fan according to a temperature difference E- α between the adjustment temperature E of the storage battery and the preset temperature α.

In one embodiment, the setting unit is configured to preset a temperature difference matrix G, and set G (G1, G2, G3, G4), where G1 is a first preset temperature difference, G2 is a second preset temperature difference, G3 is a third preset temperature difference, G4 is a fourth preset temperature difference, and G1 < G2 < G3 < G4;

the setting unit is used for presetting a rotational speed correction coefficient matrix h of the cooling fan, setting h (h 1, h2, h3, h4 and h 5), wherein h1 is a first preset rotational speed correction coefficient, h2 is a second preset rotational speed correction coefficient, h3 is a third preset rotational speed correction coefficient, h4 is a fourth preset rotational speed correction coefficient, h5 is a fifth preset rotational speed correction coefficient, and h1 is more than 0.8 and less than h2, h3 is more than h4 and less than h5 and less than 1.2;

the processing unit is used for presetting a rotation time correction coefficient matrix y of the cooling fan, and setting y (y 1, y2, y3, y4 and y 5), wherein y1 is a first preset rotation time correction coefficient, y2 is a second preset rotation time correction coefficient, y3 is a third preset rotation time correction coefficient, y4 is a fourth preset rotation time correction coefficient, y5 is a fifth preset rotation time correction coefficient, and y1 is more than 0.8 and less than y2, y3 is more than 0 and less than y4 and less than y5 and less than 1.2;

the setting unit is further configured to correct a rotation speed and a rotation time of the cooling fan according to a relationship between the temperature difference E- α and each preset temperature difference:

when E-alpha is smaller than G1, the first preset rotating speed correction coefficient h1 is selected to correct the ith preset rotating speed Ci, the rotating speed of the corrected cooling fan is Ci x h1, the first preset rotating time correction coefficient y1 is selected to correct the ith preset rotating time Di, and the rotating time of the corrected cooling fan is Di x y1;

when G1 is less than or equal to E-alpha is less than G2, the second preset rotating speed correction coefficient h2 is selected to correct the ith preset rotating speed Ci, the rotating speed of the corrected cooling fan is Ci x h2, the second preset rotating time correction coefficient y2 is selected to correct the ith preset rotating time Di, and the rotating time of the corrected cooling fan is Di x y2;

when G2 is less than or equal to E-alpha is less than G3, the third preset rotating speed correction coefficient h3 is selected to correct the ith preset rotating speed Ci, the rotating speed of the corrected cooling fan is Ci x h3, the third preset rotating time correction coefficient y3 is selected to correct the ith preset rotating time Di, and the rotating time of the corrected cooling fan is Di x y3;

when G3 is less than or equal to E-alpha is less than G4, the fourth preset rotating speed correction coefficient h4 is selected to correct the ith preset rotating speed Ci, the rotating speed of the corrected cooling fan is Ci x h4, the fourth preset rotating time correction coefficient y4 is selected to correct the ith preset rotating time Di, and the rotating time of the corrected cooling fan is Di x y4;

when G4 is less than or equal to E- α, the fifth preset rotation speed correction coefficient h5 is selected to correct the ith preset rotation speed Ci, the rotation speed of the corrected cooling fan is ci×h5, the fifth preset rotation time correction coefficient y5 is selected to correct the ith preset rotation time Di, and the rotation time of the corrected cooling fan is di×y5.

The invention provides a burning-out prevention system for a storage battery charging module of a direct current system of a power plant, which has the following beneficial effects compared with the prior art:

the invention discloses a burning-out prevention system of a storage battery charging module of a direct current system of a power plant, which comprises the following components: the power station comprises an acquisition module, a judging module, a detection module, a charging module and a discharging module, wherein the acquisition module is used for acquiring a voltage data value of a bus of a power station in real time, the judging module is used for judging and comparing the voltage data value with a preset voltage value, when the voltage data value is smaller than the preset voltage value, an alternating current input switch of a high-frequency switch is disconnected, the detection module is used for acquiring a load connected with the high-frequency switch, detecting the working state of the load, when the load is in an idle state, starting the alternating current input switch of the high-frequency switch, and the charging module is used for controlling the high-frequency switch to charge a storage battery when the alternating current input switch of the high-frequency switch is started.

Drawings

Fig. 1 shows a schematic structural diagram of a burnout prevention system for a battery charging module of a power plant direct current system according to an embodiment of the present invention;

fig. 2 is a schematic view showing the structure of a trip protection device in an embodiment of the present invention;

FIG. 3 is a schematic diagram of another structure of a battery charging module burnout prevention system of a DC system of a power plant according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a heat dissipation module according to an embodiment of the invention.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The power plant DC system generally comprises a storage battery, a charging device, a DC bus, a switch, a knife switch and other main parts.

1. DC system composition and operation mode

The power plant unit is equipped with a 220V direct current system, two groups of 1200Ah valve-controlled sealed lead-acid storage batteries (2V/104 storage batteries/group) and two sets of intelligent high-frequency switch power supply modules, the high-frequency rectifying device adopts an (N+1) redundant structure, each set of rectifying device consists of 5 30A (high-frequency module output rated current) rectifying modules, the normal work of the device is not affected by any module fault in the device, the monitoring function is provided in each module, and the control and adjustment of output voltage and current can be independently finished independently without depending on a TEP-I-C microcomputer monitoring device, and the device has the protection and alarm functions and can be plugged in a live mode. And in normal operation, the module is communicated with the monitoring device and receives the instruction. When a plurality of high-frequency switch power supply modules are in parallel operation, current can be automatically equalized. The current sharing unbalance degree is not more than +/-5%. The average fault-free interval time of the high-frequency switching power supply device is not less than 100000 hours. Each group of batteries is provided with a section of bus; a microcomputer type insulation monitoring device of TEP-G-C2 is arranged to monitor the insulation condition of two sections of DC buses; each group of storage batteries is provided with a set of TEP-B-C microcomputer storage battery inspection device which can monitor the running state and parameters of each storage battery and transmit related information to a microcomputer monitoring unit on a charging screen; each section of bus is provided with a switching-on bus, the switching-on bus is directly connected to the battery, and the control bus is obtained by reducing the voltage of the switching-on bus through an automatic silicon chain voltage reducing device.

Direct current bus wiring mode: the bus is divided into a section I bus and a section II bus, and the two sections of buses are operated separately. The two chargers are respectively provided with a section I and a section II of closing bus, and float charging or equalizing charging is carried out on the corresponding storage battery. And the I section and the II section of closing buses are respectively connected to the I section and the II section of control buses through the voltage reducing device. Normal operation mode: the first charger output switch ZK1 is connected with the first section, the first charger output switch ZK2 is connected with the second section, the first storage battery output switch ZK3 is connected with the first section, and the second storage battery output switch ZK4 is connected with the second section. When any group of storage batteries are in fault or overhauled, the section of bus can be cut to the other group of chargers and the storage battery group belt through the storage battery output switch with the chain, and at the moment, the two chargers should be put into operation. The input power supply of the charger has two paths of alternating current power supplies which are all taken from the low-voltage screen of the centralized control room. The dc bus voltage is specified as: 232-234V in floating charge and 242-246V in uniform charge.

The following is a description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings.

As shown in fig. 1 and 2, an embodiment of the present invention discloses a burnout prevention system for a battery charging module of a direct current system of a power plant, which is characterized by comprising:

In this embodiment, the preset voltage value may be set according to actual situations, such as 70% of the rated working voltage or 75% of the rated working voltage, which is not limited herein, and when the load is in an idle state, specifically means that the load is in an idle state only after the dc load of the load is stopped, and when the storage battery is fully charged, under preset conditions, such as when a power failure accident occurs in a power plant, the storage battery is started to provide dc power for accident lighting, UPS, a turbine lubrication pump, and the like, so as to ensure safe shutdown of the turbine. According to the invention, the alternating current input switch of the high-frequency switch is disconnected, when the bus voltage is lower than a preset voltage value, the alternating current input switch automatically trips, and after the direct current load is stopped, the high-frequency switch is put into the high-frequency switch to charge the storage battery, so that the load of the high-frequency switch is reduced, and the normal operation of the storage battery charging module of the direct current system of the power plant is ensured.

In some embodiments of the present application, the determining module is specifically configured to:

In the embodiment, the trip protection device is controlled based on the trip protection instruction to realize automatic trip, wherein F is the trip protection of the switch, so that the automatic trip of the high-frequency switch can be realized, and the storage battery of the direct-current system of the power plant is prevented from being burnt.

In some embodiments of the present application, the collection module is further configured to collect a supply current of the storage battery in real time;

As shown in fig. 2, in some embodiments of the present application, further includes:

In this embodiment, when the battery supplies power to the load, whether the battery is in a normal power supply state is determined according to the relationship between the power supply current of the battery and the preset power supply current range, and when the battery is in an abnormal working state, the connection between the battery and the load is timely cut off, so that the battery stops continuously supplying power to the load, the battery is further effectively protected, the power supply current of the battery is prevented from being rapidly increased, the heat productivity is also rapidly increased, and the direct current part and the bus of the module output terminal are fused.

In some embodiments of the present application, further comprising:

In this embodiment, when the power supply current is not within the preset power supply current range, it is indicated that the battery is abnormal, and an alarm signal needs to be generated in real time and an alarm is given, so that a worker is informed to perform timely processing.

As shown in fig. 2 and 3, in some embodiments of the present application, the method further includes:

In this embodiment, when the battery is in abnormal power supply state, the temperature of battery can rise sharply this moment, therefore this application gathers the temperature of battery to set for the heat dissipation instruction through the settlement unit in the heat dissipation module, control radiator fan through the execution unit, and then make radiator fan can in time dispel the heat to the battery, prevent that the battery from overheated, burn out the inside components and parts of battery.

In some embodiments of the present application, the setting unit is specifically configured to:

In this embodiment, the setting unit is further configured to set a rotation speed and a rotation time of the cooling fan according to a relationship between the temperature a of the storage battery and the temperature of each preset storage battery.

In some embodiments of the present application, the setting unit sets the rotation speed and the rotation time of the heat radiation fan to i < th > preset rotation speed Ci and i < th > preset rotation time Di, respectively, i=1, 2,3,4,5;

In this embodiment, the temperature E of the battery is the temperature of the collected battery after the execution unit controls the cooling fan according to the i-th preset rotation speed Ci and the i-th preset rotation time Di, and whether the cooling treatment of the battery needs to be continued is judged according to the relation between the temperature E of the battery and the preset temperature α, so that the problem that the cooling effect of the battery is not in place can be prevented.

In some embodiments of the present application, when the judging module judges that the heat dissipation process needs to be continued on the storage battery, the setting unit corrects the rotation speed and the rotation time of the heat dissipation fan according to a temperature difference E- α between the adjustment temperature E of the storage battery and the preset temperature α.

In some embodiments of the present application, the setting unit is configured to preset a temperature difference matrix G, set G (G1, G2, G3, G4), where G1 is a first preset temperature difference, G2 is a second preset temperature difference, G3 is a third preset temperature difference, G4 is a fourth preset temperature difference, and G1 < G2 < G3 < G4;

In this embodiment, the setting unit is further configured to correct the rotation speed and rotation time of the cooling fan according to the relationship between the temperature difference E- α and each preset temperature difference.

In summary, the embodiment of the invention comprises an acquisition module, a judgment module and a discharging module, wherein the acquisition module is used for acquiring the voltage data value of a bus of a power plant in real time, the judgment module is used for judging and comparing the voltage data value with a preset voltage value, when the voltage data value is smaller than the preset voltage value, the alternating current input switch of the high-frequency switch is disconnected, the detection module is used for acquiring a load connected with the high-frequency switch, detecting the working state of the load, and when the load is in an idle state, the alternating current input switch of the high-frequency switch is started, the charging module is used for controlling the high-frequency switch to charge a storage battery when the alternating current input switch of the high-frequency switch is started, and the discharging module is used for controlling the storage battery to supply power to the load under the preset condition.

In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Although the invention has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the entire description of these combinations is not made in the present specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Those of ordinary skill in the art will appreciate that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power plant direct current system battery charging module burn-out prevention system, comprising:

2. The power plant direct current system battery charging module burn-out prevention system of claim 1, wherein the determination module is specifically configured to:

3. The power plant direct current system battery charging module burnout prevention system of claim 1,

the acquisition module is also used for acquiring the power supply current of the storage battery in real time;

4. The power plant dc system battery charging module burn-out prevention system of claim 3, further comprising:

5. The power plant dc system battery charging module burn-out prevention system of claim 3, further comprising:

6. The power plant dc system battery charging module burn-out prevention system of claim 4, further comprising:

7. The power plant direct current system battery charging module burnout prevention system according to claim 6, wherein the setting unit is specifically configured to:

8. The power plant DC system battery charging module burn out prevention system of claim 7,

the setting unit sets the rotation speed and the rotation time of the cooling fan to be i < th > preset rotation speed Ci and i < th > preset rotation time Di, respectively, i=1, 2,3,4,5;

9. The power plant DC system battery charging module burn out prevention system of claim 8,

when the judging module judges that the heat dissipation treatment of the storage battery is required to be continued, the setting unit corrects the rotation speed and the rotation time of the heat dissipation fan according to a temperature difference E-alpha between the regulating temperature E of the storage battery and the preset temperature alpha.

10. The power plant DC system battery charging module burn out prevention system of claim 9,

the setting unit is used for presetting a temperature difference matrix G and setting G (G1, G2, G3 and G4), wherein G1 is a first preset temperature difference, G2 is a second preset temperature difference, G3 is a third preset temperature difference, G4 is a fourth preset temperature difference, and G1 is more than G2 and less than G3 and less than G4;