阅读说明：本技术 一种离心式冷水机组双启动装置及其控制方法 (Double-starting device of centrifugal water chilling unit and control method thereof ) 是由 田庆伟 于 2020-11-23 设计创作，主要内容包括：一种离心式冷水机组双启动装置及其控制方法,属于水冷机控制技术领域。本发明提供一种能够保证冷水机组安全稳定运行、冗余度低、成本低廉的双启动装置及其控制方法。双启动装置,高压进线柜与外部电源连接,高压进线柜与高压变频柜连接,高压变频柜与冷水机连接,旁路开关与高压变频柜并联,控制单元与高压进线柜连接,旁路开关的控制端与控制单元连接,高压变频柜与控制单元双向连接。其控制方法,检测模块检测高压进线柜的就绪信号是否闭合、是否反馈闭合信号、高压变频柜的就绪信号是否闭合、是否反馈闭合信号,实时检测高压变频柜的工作状态,若有异常,则发出分闸命令,并同时切换定频模式。本发明主要用于控制离心式冷水机组的启动方式。(A double-starting device of a centrifugal water chilling unit and a control method thereof belong to the technical field of water chiller control. The invention provides a double-starting device which can ensure the safe and stable operation of a water chilling unit, has low redundancy and low cost and a control method thereof. The high-voltage inlet cabinet is connected with an external power supply, the high-voltage inlet cabinet is connected with the high-voltage frequency conversion cabinet, the high-voltage frequency conversion cabinet is connected with the water chiller, the bypass switch is connected with the high-voltage frequency conversion cabinet in parallel, the control unit is connected with the high-voltage inlet cabinet, the control end of the bypass switch is connected with the control unit, and the high-voltage frequency conversion cabinet is connected with the control unit in a two-way mode. The control method comprises the steps that a detection module detects whether a ready signal of a high-voltage incoming line cabinet is closed or not, whether a closing signal is fed back or not, whether a ready signal of a high-voltage frequency conversion cabinet is closed or not, whether a closing signal is fed back or not, the working state of the high-voltage frequency conversion cabinet is detected in real time, if the working state is abnormal, a brake opening command is sent, and a fixed frequency mode is switched at the same time. The invention is mainly used for controlling the starting mode of the centrifugal water chilling unit.)

1. The utility model provides a centrifugal chiller double-start device, its characterized in that, it includes high-pressure inlet wire cabinet, high-pressure inverter cabinet, bypass switch, the control unit and cold water machine, high-pressure inlet wire cabinet is connected with external power source, the output of high-pressure inlet wire cabinet with the input of high-pressure inverter cabinet is connected, the output of high-pressure inverter cabinet with the input of cold water machine is connected, bypass switch with the high-pressure inverter cabinet is parallelly connected, the control unit's input with the high-pressure inlet wire cabinet is connected, bypass switch's control end with the control unit's output is connected, the high-pressure inverter cabinet with the control unit both way junction.

2. The dual-starting device of a centrifugal chiller according to claim 1, further comprising a transformer, wherein the transformer is disposed at an output end of the high-voltage incoming cabinet, and an output end of the transformer is connected to an input end of the control unit.

3. The centrifugal chiller double start device according to claim 1, wherein the control unit comprises a detection module, a judgment module, a command module and an alarm module,

the detection module is used for detecting the current running states of the high-voltage incoming line cabinet and the high-voltage frequency conversion cabinet and the output current of the high-voltage incoming line cabinet in real time;

the judging module is used for judging whether the signal detected by the detecting module is the same as a target signal or not;

the command module is used for outputting a control command according to the signals of the detection module and the judgment module;

the alarm module is used for monitoring the detection module, the judgment module and the command module in real time, outputting an alarm signal according to the current states of the detection module, the judgment module and the command module and stopping the machine.

4. A control method of a double-starting device of a centrifugal water chilling unit is characterized by comprising the following steps:

s1, inputting a starting command;

s2, the detection module detects whether a ready signal of the high-voltage incoming line cabinet is closed, if so, a closing instruction of the incoming line cabinet is sent, and if not, the command module outputs an alarm signal to the alarm module;

s3, the detection module detects whether the high-voltage incoming cabinet feeds back a closing signal, if so, S4 is executed, and if not, the command module outputs an alarm signal to the alarm module;

s4, the detection module detects whether a ready signal of the high-voltage frequency conversion cabinet is closed, and if yes, a closing instruction of the high-voltage frequency conversion cabinet is sent; if not, the command module outputs a command for switching the fixed frequency mode;

s5, the detection module detects whether the high-voltage frequency conversion cabinet feeds back a closing signal, if so, the command module outputs a frequency conversion control command; if not, the command module sends a brake opening command to the high-voltage frequency conversion cabinet and simultaneously outputs a command for switching a fixed frequency mode;

and S6, the detection module detects the working state of the high-voltage frequency conversion cabinet in real time, if no fault exists, the frequency conversion control is continuously executed, and if a fault occurs, the command module sends a brake opening command to the high-voltage frequency conversion cabinet and simultaneously outputs a command for switching a fixed frequency mode.

5. The control method of the double-starting device of the centrifugal chiller according to claim 4, wherein the constant frequency mode is specifically that a closing instruction is output to a bypass switch to cut off the variable frequency control of the high-voltage variable frequency cabinet, and the chiller enters the constant frequency control.

Technical Field

The invention belongs to the technical field of water cooler control, and particularly relates to a double-starting device of a centrifugal water chilling unit and a control method thereof.

Background

Under the normal condition, in order to ensure the normal starting of the centrifugal water chilling unit and avoid serious consequences on industrial production and use caused by long-time shutdown, a standby starting cabinet needs to be configured, so that when a high-voltage frequency conversion cabinet fails, the water chilling unit is started by the standby starting cabinet, or two frequency conversion cabinets are adopted to control the same water chilling unit, and the common point of the two modes is that the control cost is very high.

Therefore, a centrifugal chiller double-starting device and a control method thereof, which can ensure safe and stable operation of a chiller, have low redundancy and low cost, are needed.

Disclosure of Invention

The invention provides a centrifugal water chilling unit double-starting device and a control method thereof, which can ensure safe and stable operation of a water chilling unit, have low redundancy and low cost, and aim at overcoming the defects that the existing centrifugal water chilling unit cannot ensure safe and stable operation and a starting device is additionally arranged to cause high redundancy and high cost.

The technical scheme of the invention is as follows:

the invention relates to a double-starting device of a centrifugal water chilling unit, which comprises a high-voltage inlet cabinet, a high-voltage frequency conversion cabinet, a bypass switch, a control unit and a water chiller, wherein the high-voltage inlet cabinet is connected with an external power supply, the output end of the high-voltage inlet cabinet is connected with the input end of the high-voltage frequency conversion cabinet, the output end of the high-voltage frequency conversion cabinet is connected with the input end of the water chiller, the bypass switch is connected with the high-voltage frequency conversion cabinet in parallel, the input end of the control unit is connected with the high-voltage inlet cabinet, the control end of the bypass switch is connected with the output end of the control unit, and the high-voltage frequency conversion cabinet is connected with the control unit.

Further: the transformer is arranged at the output end of the high-voltage incoming line cabinet, and the output end of the transformer is connected with the input end of the control unit.

Further: the control unit comprises a detection module, a judgment module, a command module and an alarm module,

the detection module is used for detecting the current running states of the high-voltage incoming line cabinet and the high-voltage frequency conversion cabinet and the output current of the high-voltage incoming line cabinet in real time;

the judging module is used for judging whether the signal detected by the detecting module is the same as a target signal or not;

the command module is used for outputting a control command according to the signals of the detection module and the judgment module;

the alarm module is used for monitoring the detection module, the judgment module and the command module in real time, outputting an alarm signal according to the current states of the detection module, the judgment module and the command module and stopping the machine.

The invention discloses a control method of a double-starting device of a centrifugal water chilling unit, which comprises the following steps:

s1, inputting a starting command;

s2, the detection module detects whether a ready signal of the high-voltage incoming line cabinet is closed, if so, a closing instruction of the incoming line cabinet is sent, and if not, the command module outputs an alarm signal to the alarm module;

s3, the detection module detects whether the high-voltage incoming cabinet feeds back a closing signal, if so, S4 is executed, and if not, the command module outputs an alarm signal to the alarm module;

s4, the detection module detects whether a ready signal of the high-voltage frequency conversion cabinet is closed, and if yes, a closing instruction of the high-voltage frequency conversion cabinet is sent; if not, the command module outputs a command for switching the fixed frequency mode;

s5, the detection module detects whether the high-voltage frequency conversion cabinet feeds back a closing signal, if so, the command module outputs a frequency conversion control command; if not, the command module sends a brake opening command to the high-voltage frequency conversion cabinet and simultaneously outputs a command for switching a fixed frequency mode;

and S6, the detection module detects the working state of the high-voltage frequency conversion cabinet in real time, if no fault exists, the frequency conversion control is continuously executed, and if a fault occurs, the command module sends a brake opening command to the high-voltage frequency conversion cabinet and simultaneously outputs a command for switching a fixed frequency mode.

Further: the fixed frequency mode is specifically to output a closing instruction to a bypass switch, cut off the variable frequency control of the high-voltage variable frequency cabinet, and the water chiller enters the fixed frequency control.

The invention has the beneficial effects that:

the invention relates to a double-starting device of a centrifugal water chilling unit and a control method thereof, which are suitable for high-voltage variable-frequency starting of the centrifugal water chilling unit in important places. The invention changes the original single starting mode into the double starting mode with the main and standby functions by adding the bypass switch, simply transforming the high-voltage incoming line cabinet at the user side and controlling the high-voltage incoming line cabinet by the control unit at the equipment side. The control unit judges whether the starting mode and the running mode need to be switched or not by detecting the ready and running feedback of the frequency conversion cabinet and the fault signal of the frequency conversion cabinet. When the high-voltage frequency conversion cabinet breaks down, the high-voltage incoming cabinet at the user side can be used as a standby starting cabinet, so that a large amount of cost and occupied space are saved. The main characteristics are as follows: the main and standby functions of a double-starting cabinet mode can be realized without configuring two sets of starting cabinets, so that a large amount of cost and occupied area are saved; the incoming cabinet at the user side is automatically controlled by the equipment side control unit; the current transformer for collecting current signals is arranged on the side of the inlet wire cabinet, and when the operation is switched to the fixed-frequency operation, the control unit does not need to change the collected signals. The control unit has a fixed frequency control program and a variable frequency control program and has a self-switching function.

Drawings

FIG. 1 is a schematic structural diagram of a double starting device of a centrifugal chiller according to the present invention;

fig. 2 is a flowchart of a control method of the dual start apparatus.

Detailed Description

The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Example 1

The embodiment is described with reference to fig. 1 and fig. 2, in this embodiment, a centrifugal chiller double-start device according to this embodiment includes a high-voltage incoming cabinet, a high-voltage frequency conversion cabinet, a bypass switch, a control unit, and a chiller, where the high-voltage incoming cabinet is connected to an external power supply, an output end of the high-voltage incoming cabinet is connected to an input end of the high-voltage frequency conversion cabinet, an output end of the high-voltage frequency conversion cabinet is connected to an input end of the chiller, the bypass switch is connected in parallel to the high-voltage frequency conversion cabinet, an input end of the control unit is connected to the high-voltage incoming cabinet, a control end of the bypass switch is connected to an output end of the control unit, and the high-voltage frequency conversion cabinet is connected to the control unit. The transformer is arranged at the output end of the high-voltage incoming line cabinet, and the output end of the transformer is connected with the input end of the control unit.

Configuration:

1. high-voltage inlet wire cabinet: a ready signal, an operation feedback signal, and a current transformer;

2. high-voltage frequency conversion cabinet: ready signal, operation feedback signal, fault signal;

3. a bypass switch: cutting off the passage of the frequency conversion cabinet;

4. a control unit: the frequency conversion control device is provided with a frequency conversion control program, a fixed frequency control program and a control module, and can automatically switch to a fixed frequency mode to start the motor when a fault or unavailability of the frequency conversion cabinet is detected before the motor is started or when the motor runs.

Example 2

The present embodiment is described with reference to embodiment 1, in this embodiment, the centrifugal chiller double-start apparatus according to this embodiment includes a detection module, a determination module, a command module, and an alarm module,

the detection module is used for detecting the current running states of the high-voltage incoming line cabinet and the high-voltage frequency conversion cabinet and the output current of the high-voltage incoming line cabinet in real time;

the judging module is used for judging whether the signal detected by the detecting module is the same as a target signal or not;

the command module is used for outputting a control command according to the signals of the detection module and the judgment module;

the alarm module is used for monitoring the detection module, the judgment module and the command module in real time, outputting an alarm signal according to the current states of the detection module, the judgment module and the command module and stopping the machine.

Example 3

The present embodiment is described with reference to embodiment 1, and in this embodiment, a method for controlling a dual start device of a centrifugal chiller according to the present embodiment includes the following steps:

s1, inputting a starting command; the control program is operated in a frequency conversion mode by default;

s2, the detection module detects whether a ready signal of the high-voltage incoming line cabinet is closed, if so, a closing instruction of the incoming line cabinet is sent, and if not, the command module outputs an alarm signal to the alarm module; closing a ready signal of the inlet wire cabinet, sending out closing of the inlet wire cabinet, or else, alarming and stopping;

s3, the detection module detects whether the high-voltage incoming cabinet feeds back a closing signal, if so, S4 is executed, and if not, the command module outputs an alarm signal to the alarm module; after the inlet cabinet is switched on, detecting whether the operation feedback of the inlet cabinet is closed, if so, detecting whether the variable frequency cabinet is ready, otherwise, alarming and stopping;

s4, the detection module detects whether a ready signal of the high-voltage frequency conversion cabinet is closed, and if yes, a closing instruction of the high-voltage frequency conversion cabinet is sent; if not, the command module outputs a command for switching the fixed frequency mode; the fixed frequency mode is specifically that a closing instruction is output to a bypass switch, the variable frequency control of the high-voltage variable frequency cabinet is cut off, and the water chiller enters the fixed frequency control; after the incoming line cabinet is switched on, detecting whether the frequency conversion cabinet is ready, if so, sending a switching-on instruction of the frequency conversion cabinet, otherwise, automatically switching the control program into a constant frequency mode;

s5, the detection module detects whether the high-voltage frequency conversion cabinet feeds back a closing signal, if so, the command module outputs a frequency conversion control command; if not, the command module sends a brake opening command to the high-voltage frequency conversion cabinet and simultaneously outputs a command for switching a fixed frequency mode; after the variable frequency cabinet is switched on, detecting the operation feedback of the variable frequency cabinet, if the variable frequency cabinet is switched on, the motor enters a variable frequency mode for control, otherwise, sending a switching-off instruction of the variable frequency cabinet, and automatically switching a control program into a constant frequency mode;

and S6, the detection module detects the working state of the high-voltage frequency conversion cabinet in real time, if no fault exists, the frequency conversion control is continuously executed, and if a fault occurs, the command module sends a brake opening command to the high-voltage frequency conversion cabinet and simultaneously outputs a command for switching a fixed frequency mode. After the motor enters a frequency conversion mode for control, detecting the fault of the frequency conversion cabinet in real time, if the fault exists, sending a switching-off instruction of the frequency conversion cabinet, and automatically switching a control program into a constant frequency mode; and after the control program is automatically switched to a constant-frequency mode, a bypass cabinet closing instruction is sent, and the motor enters constant-frequency control.