阅读说明：本技术 一种得电自启动的热备空压机组控制系统及方法 (Control system and method for hot standby air compressor unit capable of achieving power-on self-starting ) 是由 刘超 褚小强 杨庚生 陆兵 陈志� 陈磊 沈洋洋 于 2021-09-27 设计创作，主要内容包括：本发明提供一种得电自启动的热备空压机组控制系统及方法,包括空压机组以及综合控制单元,所述空压机组包括通过管道与储气罐连接的主用空压机和备用空压机,且所述主用空压机和备用空压机均设置有单机控制模块；所述综合控制单元包括微控制器以及与所述微控制器连接的第一通讯模块、开关量模块、以太网模块以及后备电源模块,所述第一通讯模块与空压机组的单机控制模块连接,所述开关量模块连接有用于监视电源信号的主用空压机监视器、备用空压机监视器以及市电监视器。本发明通过微控制器与主用空压机和备用空压机的单机控制器进行通讯,实现空压机在热备冗余及断电后的自启动,同时能够联通全厂监控系统,在市电消失后可保持对空压机组系统控制电源及市电电源信号进行实时监视,整体结构简单、易于维护,减少了故障的发生,有效保证了水电站的正常运行。(The invention provides a control system and a control method of a hot standby air compressor unit capable of being automatically started by power supply, wherein the control system comprises an air compressor unit and a comprehensive control unit, the air compressor unit comprises a main air compressor and a standby air compressor which are connected with an air storage tank through pipelines, and the main air compressor and the standby air compressor are both provided with a single-machine control module; the comprehensive control unit comprises a microcontroller, a first communication module, a switching value module, an Ethernet module and a backup power supply module, wherein the first communication module, the switching value module, the Ethernet module and the backup power supply module are connected with the microcontroller, the first communication module is connected with a single machine control module of the air compressor unit, and the switching value module is connected with a main air compressor monitor, a backup air compressor monitor and a mains supply monitor which are used for monitoring power supply signals. The invention realizes the self-starting of the air compressor after hot standby redundancy and power failure by communicating the microcontroller with the single controllers of the main air compressor and the standby air compressor, can communicate a whole plant monitoring system, can keep monitoring the control power supply and the commercial power supply signal of the air compressor unit system in real time after commercial power disappears, has simple integral structure and easy maintenance, reduces the occurrence of faults, and effectively ensures the normal operation of a hydropower station.)

1. The utility model provides a get electric self-starting's hot spare air compressor unit control system which characterized in that includes:

the air compressor unit comprises a main air compressor and a standby air compressor which are connected with an air storage tank through pipelines, and the main air compressor and the standby air compressor are both provided with a single-machine control module; and

the comprehensive control unit comprises a microcontroller, and a first communication module, a switching value module, an Ethernet module and a backup power module which are connected with the microcontroller, wherein the first communication module is respectively connected with a single-machine control module of a main air compressor and a backup air compressor, the switching value module is connected with a main air compressor monitor, a backup air compressor monitor and a commercial power monitor which are used for monitoring power signals, and the Ethernet module is interconnected with a whole plant monitoring network.

2. The electric-power-on self-starting hot standby air compressor unit control system according to claim 1, wherein the stand-alone controller is connected with an input module, an output module and a second communication module, the input module is respectively connected with an emergency stop button, a host temperature monitor, a pressure transmitter and a pressure switch, the output module is connected with a loading valve and a cold area fan, and the second communication module is connected with a frequency converter for controlling the running power of an air compressor.

3. The powered self-starting hot-standby air compressor unit control system according to claim 1, wherein the microcontroller is provided with a buzzer capable of alarming for a failure of the air compressor unit.

4. The electric self-starting hot-standby air compressor unit control system according to claim 1, wherein a display module is further connected to the stand-alone controller.

5. A control method of a power-on self-starting hot standby air compressor unit is realized based on the control system of the power-on self-starting hot standby air compressor unit as claimed in any one of claims 1 to 4, and is characterized by specifically comprising the following steps:

setting a pressure limit value of an air compressor unit to enable the pressure limit value of a main air compressor to be within the range of the pressure limit value of a standby air compressor;

step two, controlling the frequency converter to accelerate from the operation power of 0Hz to the lower limit value of frequency through the single-machine controller and then continuously operating until internal pressure is built in an air storage tank communicated with the air compressor unit;

step three, controlling a loading valve to be opened through a single-machine controller, continuously loading and operating, monitoring a loading pressure value through a pressure transmitter, and adjusting the limit value of the operating frequency of the air compressor according to a PID algorithm;

step four, after the air compressor unit continuously works for a period of time, the standby air compressor is dormant, and the main air compressor runs at constant pressure;

and step five, monitoring the pipeline pressure in real time, and automatically waking up the standby air compressor to start air supply when the main air compressor is abnormal and the pipeline pressure is gradually reduced to a pressure value for dormancy waking up.

Technical Field

The invention relates to the technical field of hydropower station air compressor unit control, in particular to a system and a method for controlling a hot standby air compressor unit capable of being automatically started by power supply.

Background

A control system of a hollow compressor unit in a hydropower station is an important component of auxiliary equipment of the hydropower station and aims to provide a pressure air source for an oil pressure device of a hydroelectric speed regulator, ensure the pressure of pressure oil of the speed regulator and guarantee the precondition that the speed regulator of the hydropower station, even a water turbine and a generator can normally operate when the hollow compressor unit normally operates.

At present, the traditional automatic control system technology of the air compressor unit is quite mature, the fault resolution capability and the fault processing capability are high, but no better solution exists how to realize the self-starting of the air compressor after the hot standby redundancy and the power failure, and the normal power generation of the whole hydropower station is influenced; meanwhile, the control power supply of the air compressor system and the monitoring of the commercial power supply signal cannot be realized with a whole plant monitoring system after power failure, and the requirement of stable operation of the current hydropower station cannot be met.

Disclosure of Invention

The invention aims to provide a control system of a hot standby air compressor unit capable of being automatically started by power supply, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

a power-on self-starting hot spare air compressor unit control system comprises:

the air compressor unit comprises a main air compressor and a standby air compressor which are connected with an air storage tank through pipelines, and the main air compressor and the standby air compressor are both provided with a single-machine control module; and

the comprehensive control unit comprises a microcontroller, and a first communication module, a switching value module, an Ethernet module and a backup power supply module which are connected with the microcontroller, wherein the first communication module is respectively connected with a single-machine control module of a main air compressor and a backup air compressor, and the switching value module is connected with a main air compressor monitor, a backup air compressor monitor and a mains supply monitor which are used for monitoring power supply signals.

Further, the stand-alone controller is connected with input module, output module and second communication module, input module is connected with emergency stop button, host computer temperature monitor, pressure transmitter and pressure switch respectively, output module is connected with loading valve and cold district fan, second communication module is connected with the converter of control air compressor machine operating power.

Preferably, the microcontroller is provided with a buzzer capable of alarming a fault of the air compressor unit.

Preferably, the stand-alone controller is further connected with a display module.

A control method of a power-on self-starting hot standby air compressor unit is realized based on the control system of the power-on self-starting hot standby air compressor unit, and specifically comprises the following steps:

setting a pressure limit value of an air compressor unit to enable the pressure limit value of a main air compressor to be within the range of the pressure limit value of a standby air compressor;

step two, controlling the frequency converter to accelerate from the operation power of 0Hz to the lower limit value of frequency through the single-machine controller and then continuously operating until internal pressure is built in an air storage tank communicated with the air compressor unit;

step three, controlling a loading valve to be opened through a single-machine controller, continuously loading and operating, monitoring a loading pressure value through a pressure transmitter, and adjusting the limit value of the operating frequency of the air compressor according to a PID algorithm;

step four, after the air compressor unit continuously works for a period of time, the standby air compressor is dormant, and the main air compressor runs at constant pressure;

and step five, monitoring the pipeline pressure in real time, and automatically waking up the standby air compressor to start air supply when the main air compressor is abnormal and the pipeline pressure is gradually reduced to a pressure value for dormancy waking up.

According to the technical scheme, the microcontroller is communicated with the single-machine controllers of the main air compressor and the standby air compressor, so that the air compressors are automatically started after hot standby redundancy and power failure are realized, the whole plant monitoring system can be communicated, the control power supply and the mains supply signals of the air compressor unit system can be monitored in real time after mains supply disappears, the whole structure is simple, the maintenance is easy, the occurrence of faults is reduced, and the normal operation of a hydropower station is effectively ensured.

Drawings

FIG. 1 is a schematic diagram of the integrated control unit of the present invention;

FIG. 2 is a schematic structural diagram of a single-machine controller of the air compressor according to the present invention;

FIG. 3 is a flow chart illustrating steps of the control method according to the present invention;

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The control system of the hot standby air compressor unit capable of being automatically started after power is obtained as shown in fig. 1 comprises an air compressor unit and a comprehensive control unit, wherein the air compressor unit comprises a main air compressor and a standby air compressor which are connected with an air storage tank through pipelines, and the main air compressor and the standby air compressor are both provided with a single-machine control module; the comprehensive control unit comprises a microcontroller, and a first communication module, a switching value module, an Ethernet module and a backup power supply module which are connected with the microcontroller, wherein the first communication module is respectively connected with a single-machine control module of a main air compressor and a backup air compressor, and the switching value module is connected with a main air compressor monitor, a backup air compressor monitor and a mains supply monitor which are used for monitoring power supply signals.

Specifically, as shown in fig. 2, the stand-alone controller is connected with an input module, an output module and a second communication module, the input module is respectively connected with an emergency stop button, a host temperature monitor, a pressure transmitter and a pressure switch, the output module is connected with a loading valve and a cold area fan, and the second communication module is connected with a frequency converter for controlling the operation power of the air compressor; in specific use, a power loop of the air compressor unit consists of an air circuit breaker, a frequency converter and an air compressor motor, wherein the frequency converter can carry out frequency conversion transformation on the air compressor so as to stabilize air supply pressure; and the cooling fan power loop consists of an air circuit breaker, a contactor and a cooling fan.

Meanwhile, the microcontroller of the preferred embodiment is provided with a buzzer capable of alarming the fault of the air compressor unit, so that a worker can quickly deal with the fault and normal operation of a hydropower station is ensured; the single-machine controller is also connected with a display module, and a co-homed visual interface is convenient for co-workers to operate and inquire information.

The control method for the hot standby air compressor unit capable of being automatically started by power supply shown in fig. 3 is realized based on the control system for the hot standby air compressor unit capable of being automatically started by power supply, and specifically comprises the following steps:

s1, setting a pressure limit value of the air compressor unit to enable the pressure limit value of the main air compressor to be within the range of the pressure limit value of the standby air compressor;

specifically, the set value of the upper pressure limit of the main air compressor is lower than the set value of the upper pressure limit of the standby air compressor, and the set value of the lower pressure limit of the main air compressor is higher than the set value of the lower pressure limit of the standby air compressor.

S2, controlling the frequency converter to accelerate from 0Hz operation power to a frequency lower limit value through the single-machine controller and then continuously operating until internal pressure is built in an air storage tank communicated with the air compressor unit;

s3, controlling the loading valve to be opened through the single-machine controller, continuously loading and operating, monitoring the loading pressure value through the pressure transmitter, and adjusting the limit value of the operating frequency of the air compressor according to the PID algorithm;

in specific use, when the loading pressure is continuously higher than the unloading pressure, the system controls the air compressor to sleep until the loading pressure is lower than the sleep awakening pressure, and then the air compressor is awakened and continues to operate;

s4, after the air compressor unit continuously works for a period of time, the standby air compressor is dormant, and the main air compressor runs at a constant pressure;

and S5, monitoring the pipeline pressure in real time, and automatically waking up the standby air compressor to start air supply when the main air compressor is abnormal and the pipeline pressure is gradually reduced to a pressure value for waking up from dormancy.

The preferred embodiment adopts the microcontroller to communicate with the single-machine controllers of the main air compressor and the standby air compressor, if the mains supply is powered off, the microcontroller has the electricity storage function by virtue of the backup power module, so that the control power supply and the mains supply signal of the air compressor set system can be kept monitored after the mains supply disappears, the communication relation is kept, the recording and the analysis are carried out, the fault type of the previous shutdown is judged by the analysis result of the micro-control root moment after the mains supply is recovered, and if the fault type is caused by the mains supply disappearance, the main air compressor can be automatically started, so that the normal supply of an air system of a hydropower station and the normal operation of the hydropower station are ensured.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.