CN110649825A - Control system and control method for low-harmonic frequency converter of air conditioner - Google Patents
Control system and control method for low-harmonic frequency converter of air conditioner Download PDFInfo
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- CN110649825A CN110649825A CN201911177414.0A CN201911177414A CN110649825A CN 110649825 A CN110649825 A CN 110649825A CN 201911177414 A CN201911177414 A CN 201911177414A CN 110649825 A CN110649825 A CN 110649825A
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- air conditioner
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0018—Air-conditioning means, i.e. combining at least two of the following ways of treating or supplying air, namely heating, cooling or ventilating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a control system and a control method for a low-harmonic frequency converter of an air conditioner, wherein the control system for the low-harmonic frequency converter of the air conditioner comprises the following components: the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; the control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit; the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction; according to the invention, through acquiring the working state signals output by the controllable rectifier and the inverter, the normal power supply of the inverter by the controllable rectifier under a normal state and a special power supply mode under a fault state are realized, the normal work of the air conditioning unit is ensured as much as possible, and the redundant power supply capacity under the fault state is improved.
Description
Technical Field
The invention relates to the field of rail transit air conditioner control, in particular to a control system and a control method of an air conditioner low-harmonic frequency converter.
Background
With the increasing requirements of energy conservation and low harmonic of railway products in the railway and subway industries, the track air conditioner increasingly adopts a low harmonic frequency conversion technology, wherein a low harmonic frequency converter system is adopted to supply power to an air conditioner compressor.
When the system normally works, three-phase AC380V input power is rectified by the controllable rectifier, then direct current bus voltage is output to serve as direct current input of the inverter, three-phase alternating current power supplies of 0 ~ 100Hz and 0 ~ 380V are provided for the compressor after inversion and frequency modulation, the controllable rectifier and the inverter are respectively communicated with the air conditioner controller through communication ports and transmit parameters such as current, voltage and frequency, the controllable rectifier and the inverter feed fault signals back to the air conditioner controller through a dry joint, the air conditioner controller controls the three-phase AC380V input contactor at the front end of the controllable rectifier according to the working state of the controllable rectifier and the inverter, the air conditioner controller controls starting of the inverter through a digital quantity output port of the air conditioner controller, the air conditioner controller controls output frequency of the inverter through an analog quantity output port of the air conditioner controller, each air conditioner unit generally consists of two mutually independent systems, and therefore the two sets of low-harmonic-frequency converter systems are required to supply power for the compressor, namely the two sets of mutually independent rectifiers and inverters are added.
Therefore, the two sets of mutually independent low-harmonic frequency converter systems cannot realize the cross power supply of the controllable rectifier and the inverter, when the controllable rectifier and the inverter of different systems simultaneously fail, two compressors of the air conditioning unit can not work normally, the normal operation of the whole air conditioning unit is influenced, and the emergency mutual backup function is lacked, when one controllable rectifier fails, the corresponding compressor can not work normally, when one equipment fails, the other equipment in the same system can report the failure, the misjudgment of the failed equipment is caused, and an emergency working scheme of a specific emergency situation is lacked, when the two controllable rectifiers can not work normally, the two compressors of the air conditioning unit can not work normally, the normal operation of the whole air conditioning unit is influenced, and the problem that the frequency converter system has a plurality of external communication interfaces is also existed, so that the communication interface of the air conditioner controller is limited and the communication mode is fixed.
Therefore, it is desirable to develop a new control system and method for a low-harmonic inverter of an air conditioner to solve the above problems.
Disclosure of Invention
The invention aims to provide a control system and a control method for a low-harmonic frequency converter of an air conditioner.
In order to solve the above technical problem, the present invention provides a control system for a low-harmonic inverter of an air conditioner, comprising: the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; the control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit; and the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction.
Further, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when normal signals of the first controllable rectifier, the second controllable rectifier, the first inverter and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output first bus voltage to the first inverter, controls the second controllable rectifier to output second bus voltage to the second inverter, and controls the first inverter and the second inverter to start.
Further, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when the normal signals of the first controllable rectifier, the second controllable rectifier and the second inverter and the fault signal of the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a second inverter starting signal to the control switching unit, namely the control switching unit controls the second controllable rectifier to output second bus voltage to the second inverter and controls the second inverter to start; and when the normal signals of the first controllable rectifier, the second controllable rectifier, the first inverter and the fault signals of the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a first inverter starting signal to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter and controls the first inverter to start.
Further, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when the normal signals of the second controllable rectifier and the first inverter and the fault signals of the first controllable rectifier and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a first inverter starting signal to the control switching unit, namely the control switching unit controls the second controllable rectifier to output second bus voltage to the first inverter and controls the first inverter to start; and when the normal signals of the first controllable rectifier and the second inverter and the fault signals of the second controllable rectifier and the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a second inverter starting signal to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output the first bus voltage to the second inverter and controls the second inverter to start.
Further, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when normal signals of the second controllable rectifier, the first inverter and the second inverter and fault signals of the first controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, namely the control switching unit controls the second controllable rectifier to output second bus voltage to the first inverter and the second inverter and controls the first inverter and the second inverter to carry out starting under the condition of reducing rated power; and when the normal signals of the first controllable rectifier, the first inverter and the second inverter and the fault signal of the second controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter and the second inverter and controls the first inverter and the second inverter to carry out starting under the condition of reducing rated power.
Further, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when normal signals of the second controllable rectifier and the second inverter and fault signals of the first controllable rectifier and the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller is suitable for controlling the controllable rectifier and the inverter which are arranged in a crossed mode to carry out cross power supply through the control switching unit, and judging the fault signals again, namely if the first controllable rectifier and the first inverter are recovered to be normal, the cross power supply is kept; if the first inverter is recovered to be normal, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode; when normal signals of the first controllable rectifier and the first inverter and fault signals of the second controllable rectifier and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller is suitable for controlling the controllable rectifier and the inverter which are arranged in a crossed mode to carry out cross power supply through the control switching unit, and judging the fault signals again, namely if the second controllable rectifier and the second inverter are recovered to be normal, the cross power supply is kept; and if the second inverter is recovered to be normal, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode.
Further, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; the first inverter and the second inverter are both universal frequency converters, namely when fault signals of the first controllable rectifier and the second controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, and the control switching unit controls the first inverter and the second inverter to be connected with three-phase voltage and controls the first inverter and the second inverter to be started.
In another aspect, the present invention provides a method for controlling a low-harmonic inverter of an air conditioner, including: the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; the control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit; and the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction.
Further, if the controllable rectifier and the inverter which are arranged in a crossed mode have faults at the same time, the control switching unit starts the other controllable rectifier and the other inverter to work in a crossed power supply mode.
Further, if one of the controllable rectifiers fails, the control switching unit starts the two inverters in a one-to-two power supply mode and performs frequency reduction control on the two inverters.
Further, the control method of the air conditioner low-harmonic frequency converter is suitable for judging that the corresponding controllable rectifier and the inverter have faults at the same time through cross power supply, and the control switching unit selects the other controllable rectifiers to supply power to the inverter.
Further, the inverter is a universal frequency converter, that is, when two controllable rectifiers simultaneously fail, the control switching unit connects the three-phase voltage to the corresponding universal frequency converter and controls the working frequency of the two universal frequency converters.
The invention has the advantages that the normal power supply of the inverter by the controllable rectifier under the normal state and the special power supply mode under the fault state are realized by the controllable rectifier by acquiring the working state signals output by the controllable rectifier and the inverter, the normal work of the air conditioning unit is ensured as much as possible, and the redundant power supply capacity under the fault state is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic block diagram of an air conditioner low harmonic inverter control system of the present invention;
FIG. 2 is a flow chart of the operation of the normal power supply condition of the present invention;
FIG. 3-1 is a flowchart illustrating a first power condition when the inverter of the present invention fails;
3-2 is a work flow diagram of a second power supply condition when the inverter of the present invention fails;
FIG. 4-1 is a flowchart illustrating a first cross-supply condition of the present invention;
FIG. 4-2 is a flowchart illustrating the operation of the cross-feed condition two of the present invention;
FIG. 5-1 is a flow chart of the operation of the one-to-two power supply condition one of the present invention;
FIG. 5-2 is a flow chart of the operation of a one-to-two power supply condition two of the present invention;
FIG. 6 is a flow chart of the operation of the fault device for determining the operating condition of the present invention;
fig. 7 is a flow chart of the general inverter group emergency operation of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1
Fig. 1 is a schematic block diagram of a control system of an air conditioner low-harmonic inverter according to the present invention.
In this embodiment, as shown in fig. 1, the present embodiment provides a control system for a low-harmonic inverter of an air conditioner, which includes: the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; the control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit; and the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction.
In this embodiment, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively a first inverter and a second inverter which are matched with the first controllable rectifier and the second controllable rectifier; i.e. the first controllable rectifier is matched to the first inverter and the second controllable rectifier is matched to the second inverter.
In this embodiment, by obtaining the operating state signals output by the controllable rectifier and the inverter, the normal power supply of the controllable rectifier to the inverter in the normal state and the special power supply mode in the fault state are realized, the normal operation of the air conditioning unit is ensured as much as possible, and the redundant power supply capability in the fault state is improved.
FIG. 2 is a flow chart of the normal power supply operation of the present invention.
In this embodiment, as an alternative implementation, as shown in fig. 2, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected to the three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when normal signals of the first controllable rectifier, the second controllable rectifier, the first inverter and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output first bus voltage to the first inverter, controls the second controllable rectifier to output second bus voltage to the second inverter, and controls the first inverter and the second inverter to start.
In the present embodiment, please refer to fig. 2, in which the rectifier 1, the rectifier 2, the inverter 1, the inverter 2, the bus voltage DC1, and the bus voltage DC2 refer to the first controllable rectifier, the second controllable rectifier, the first inverter, the second inverter, the first bus voltage, and the second bus voltage, respectively; if the rectifier 1, the rectifier 2, the inverter 1 and the inverter 2 output normal signals and input and output parameters to the control switching unit, namely the rectifier 1 supplies power to the inverter 1 and the rectifier 2 supplies power to the inverter 2, meanwhile, the control switching unit feeds back the normal working information, the input and output parameters of the four devices to the air conditioner controller, and the air conditioner controller outputs starting and frequency signals to the inverter 1 and the inverter 2 after passing through the control switching unit.
FIG. 3-1 is a flowchart illustrating a first power condition when the inverter of the present invention fails;
fig. 3-2 is a work flow diagram of the second power supply condition when the inverter of the invention fails.
In this embodiment, as an alternative implementation, as shown in fig. 3-1 and 3-2, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when the normal signals of the first controllable rectifier, the second controllable rectifier and the second inverter and the fault signal of the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a second inverter starting signal to the control switching unit, namely the control switching unit controls the second controllable rectifier to output second bus voltage to the second inverter and controls the second inverter to start; and when the normal signals of the first controllable rectifier, the second controllable rectifier, the first inverter and the fault signals of the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a first inverter starting signal to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter and controls the first inverter to start.
In the present embodiment, please refer to fig. 3-1 and fig. 3-2, in which the rectifier 1, the rectifier 2, the inverter 1, the inverter 2, the bus voltage DC1, and the bus voltage DC2 refer to the first controllable rectifier, the second controllable rectifier, the first inverter, the second inverter, the first bus voltage, and the second bus voltage, respectively; if the rectifier 1, the rectifier 2 and the inverter 2 output normal signals and input and output parameters, the inverter 1 fails, and the controllable rectifier is kept to normally supply power to the inverter through the control switching unit, namely the rectifier 1 supplies power to the inverter 1 and the rectifier 2 supplies power to the inverter 2, meanwhile, the control switching unit records failure information and feeds back the failure signals of the inverter 1 and the input and output parameters of other equipment to the air conditioner controller, the air conditioner controller outputs the starting of the inverter 2, the frequency signals are transmitted to the inverter 2 through the control switching unit, and a three-phase AC380V _1 contactor at the front end of the rectifier 1 is disconnected; if the rectifier 1, the rectifier 2 and the inverter 1 output normal signals and input and output parameters, the inverter 2 breaks down, the controllable rectifier is kept to normally supply power to the inverter through the control switching unit, namely the rectifier 1 supplies power to the inverter 1, the rectifier 2 supplies power to the inverter 2, meanwhile, the control switching unit records fault information and feeds back the fault signals of the inverter 2 and the input and output parameters of other equipment to the air conditioner controller, the air conditioner controller outputs the starting of the inverter 1, the frequency signals are transmitted to the inverter 1 through the control switching unit, and a three-phase AC380V _2 contactor at the front end of the rectifier 2 is disconnected.
FIG. 4-1 is a flowchart illustrating a first cross-supply condition of the present invention;
fig. 4-2 is a flow chart of the operation of the cross power supply operating condition two of the present invention.
In this embodiment, as an alternative implementation, as shown in fig. 4-1 and 4-2, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when the normal signals of the second controllable rectifier and the first inverter and the fault signals of the first controllable rectifier and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a first inverter starting signal to the control switching unit, namely the control switching unit controls the second controllable rectifier to output second bus voltage to the first inverter and controls the first inverter to start; and when the normal signals of the first controllable rectifier and the second inverter and the fault signals of the second controllable rectifier and the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a second inverter starting signal to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output the first bus voltage to the second inverter and controls the second inverter to start.
In the present embodiment, please refer to fig. 4-1 and 4-2, in which the rectifier 1, the rectifier 2, the inverter 1, the inverter 2, the bus voltage DC1, and the bus voltage DC2 refer to the first controllable rectifier, the second controllable rectifier, the first inverter, the second inverter, the first bus voltage, and the second bus voltage, respectively; if the rectifier 2 and the inverter 1 output normal signals and input and output parameters, and the rectifier 1 and the inverter 2 have faults, the power supply mode of the controllable rectifier to the inverter is switched to cross power supply through the control switching unit, namely the rectifier 1 supplies power to the inverter 2 and the rectifier 2 supplies power to the inverter 1, the control switching unit records fault information and feeds back the fault signals of the rectifier 1 and the inverter 2 and the input and output parameters of other equipment to the air conditioner controller, the air conditioner controller outputs the starting of the inverter 1, transmits frequency signals to the inverter 1 through the control switching unit, and disconnects a three-phase AC380V _1 contactor at the front end of the rectifier 1; if the rectifier 1 and the inverter 2 output normal signals and input and output parameters, and the rectifier 2 and the inverter 1 have faults, the power supply mode of the controllable rectifier to the inverter is switched to cross power supply through the control switching unit, namely the rectifier 1 supplies power to the inverter 2, and the rectifier 2 supplies power to the inverter 1, meanwhile, the control switching unit records fault information and feeds back the fault signals of the rectifier 2 and the inverter 1 and the input and output parameters of other equipment to the air conditioner controller, the air conditioner controller outputs the starting of the inverter 2, transmits frequency signals to the inverter 2 through the control switching unit, and disconnects a three-phase AC380V _2 contactor at the front end of the rectifier 2.
FIG. 5-1 is a flow chart of the operation of the one-to-two power supply condition one of the present invention;
fig. 5-2 is a flow chart of the operation of the one-to-two power supply condition two of the present invention.
In this embodiment, as an alternative implementation, as shown in fig. 5-1 and 5-2, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when normal signals of the second controllable rectifier, the first inverter and the second inverter and fault signals of the first controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, namely the control switching unit controls the second controllable rectifier to output second bus voltage to the first inverter and the second inverter and controls the first inverter and the second inverter to carry out starting under the condition of reducing rated power; and when the normal signals of the first controllable rectifier, the first inverter and the second inverter and the fault signal of the second controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, namely, the control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter and the second inverter and controls the first inverter and the second inverter to carry out starting under the condition of reducing rated power.
In the present embodiment, please refer to fig. 5-1 and 5-2, in which the rectifier 1, the rectifier 2, the inverter 1, the inverter 2, the bus voltage DC1, and the bus voltage DC2 refer to the first controllable rectifier, the second controllable rectifier, the first inverter, the second inverter, the first bus voltage, and the second bus voltage, respectively; if the rectifier 2, the inverter 1 and the inverter 2 output normal signals and input and output parameters, and the rectifier 1 fails, the power supply mode of the controllable rectifier to the inverter is switched to one-to-two power supply through the control switching unit, namely the rectifier 2 supplies power to the inverter 1 and the inverter 2 together, the control switching unit records fault information and feeds back the fault signals of the rectifier 1 and the input and output parameters of other equipment to the air conditioner controller, starting and frequency signals output by the air conditioner controller are output to the inverter 1 and the inverter 2 through the control switching unit in sequence, and a three-phase AC380V _1 contactor at the front end of the rectifier 1 is disconnected; if the rectifier 1, the inverter 1 and the inverter 2 output normal signals and input and output parameters, and the rectifier 2 fails, the power supply mode of the controllable rectifier to the inverter is switched to one-to-two power supply through the control switching unit, namely the rectifier 1 supplies power to the inverter 1 and the inverter 2 together, the control switching unit records failure information and feeds back the failure signals of the rectifier 2 and the input and output parameters of other equipment to the air conditioner controller, starting and frequency signals output by the air conditioner controller are output to the inverter 1 and the inverter 2 through the control switching unit in sequence, and a three-phase AC380V _2 contactor at the front end of the rectifier 2 is disconnected.
Fig. 6 is a flow chart of the operation of the fault device for determining the operating condition of the present invention.
In this embodiment, as an alternative implementation, as shown in fig. 6, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected to the three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; when normal signals of the second controllable rectifier and the second inverter and fault signals of the first controllable rectifier and the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller is suitable for controlling the controllable rectifier and the inverter which are arranged in a crossed mode to carry out cross power supply through the control switching unit, and judging the fault signals again, namely if the first controllable rectifier and the first inverter are recovered to be normal, the cross power supply is kept; if the first inverter is recovered to be normal, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode; when normal signals of the first controllable rectifier and the first inverter and fault signals of the second controllable rectifier and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller is suitable for controlling the controllable rectifier and the inverter which are arranged in a crossed mode to carry out cross power supply through the control switching unit, and judging the fault signals again, namely if the second controllable rectifier and the second inverter are recovered to be normal, the cross power supply is kept; and if the second inverter is recovered to be normal, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode.
In the present embodiment, please refer to fig. 6, in which the rectifier 1, the rectifier 2, the inverter 1, the inverter 2, the bus voltage DC1, and the bus voltage DC2 refer to the first controllable rectifier, the second controllable rectifier, the first inverter, the second inverter, the first bus voltage, and the second bus voltage, respectively; if the rectifier 2 and the inverter 2 output normal signals and input and output parameters, and the rectifier 1 and the inverter 1 have faults, the cross power supply of the controllable rectifiers which are arranged in a cross mode to the inverter is achieved by controlling the switching unit, meanwhile, the switching unit is controlled to output starting signals of the inverter 1 and the inverter 2, and enough time (about 5 s) for starting the equipment is kept. If the inverter 1 works normally and outputs a normal signal, and the rectifier 1 outputs a fault signal, the rectifier 1 is judged to be in fault, the control switching unit starts the two inverters in a one-to-two power supply mode, and controls the two inverters in a frequency reduction mode. If all the equipment normally works, the cross power supply mode is kept to continue to normally work; if the rectifier 1 works normally and outputs a normal signal, and the inverter 1 outputs a fault signal, the fault of the inverter 1 is judged; if the rectifier 1 and the inverter 1 still output fault signals, normal power supply is switched, meanwhile, the switching unit is controlled to record fault information, input and output parameters of the rectifier 1 and the inverter 1 and other equipment are fed back to the air conditioner controller, the air conditioner controller outputs starting of the inverter 2, frequency signals are transmitted to the inverter 2 after passing through the switching unit, and a three-phase AC380V _1 contactor at the front end of the rectifier 1 is disconnected. On the contrary, when the rectifier 2 and the inverter 2 are failed at the same time, the control mode is the same.
Fig. 7 is a flow chart of the general inverter group emergency operation of the present invention.
In this embodiment, as an alternative implementation, as shown in fig. 7, the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected to the three-phase voltage; the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier; the first inverter and the second inverter are both universal frequency converters, namely when fault signals of the first controllable rectifier and the second controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, and the control switching unit controls the first inverter and the second inverter to be connected with three-phase voltage and controls the first inverter and the second inverter to be started.
In the present embodiment, please refer to fig. 7, in which the rectifier 1, the rectifier 2, the general inverter 1, the general inverter 2, the bus voltage DC1, and the bus voltage DC2 refer to the first controllable rectifier, the second controllable rectifier, the first inverter, the second inverter, the first bus voltage, and the second bus voltage, respectively; under the condition that a universal frequency converter is adopted at the rear stage, if the universal frequency converter 1 and the universal frequency converter 2 output normal signals and input and output parameters, the rectifier 1 and the rectifier 2 have faults, at the moment, the three-phase AC380V _1 and the three-phase AC380V _2 are respectively and directly used as the input of the universal frequency converter 1 and the universal frequency converter 2 through controlling the switching unit, the switching unit is controlled to record fault information and feed back the fault signals of the rectifier 1 and the rectifier 2 and the input and output parameters of other equipment to the air conditioner controller, and the air conditioner controller outputs the starting signals of the universal frequency converter 1 and the universal frequency converter 2 and respectively transmits the frequency signals to the universal frequency converter 1 and the universal frequency converter 2 after controlling the switching unit.
Example 2
On the basis of embodiment 1, this embodiment provides a control method for a low-harmonic inverter of an air conditioner, which includes: the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; the control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit; and the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction.
Specifically, the control method of the air conditioner low-harmonic frequency converter is suitable for adopting the control system of the air conditioner low-harmonic frequency converter provided in the embodiment 1.
In the present embodiment, the air conditioner low-harmonic inverter control system has been explained in embodiment 1.
In this embodiment, as an optional implementation manner, if the controllable rectifier and the inverter arranged in the cross fail at the same time, the control switching unit starts another controllable rectifier and the inverter to operate in the cross power supply manner.
In this embodiment, as an optional implementation manner, if one of the controllable rectifiers fails, the control switching unit starts the two inverters by using a one-to-two power supply method, and performs down-conversion control on the two inverters.
In this embodiment, as an optional implementation manner, the control method of the air conditioner low-harmonic frequency converter is adapted to determine that the corresponding controllable rectifier and the inverter have a fault at the same time through cross power supply, and the control switching unit selects the remaining controllable rectifiers to supply power to the inverter.
In this embodiment, the controllable rectifiers and inverters corresponding to the simultaneous failure are determined to belong to the matched controllable rectifiers and inverters through cross power supply, and the control switching unit selects the other controllable rectifiers to supply power to the inverters matched with the other controllable rectifiers.
In this embodiment, as an optional implementation manner, the inverter is a universal frequency converter, that is, when two controllable rectifiers fail simultaneously, the control switching unit connects the three-phase voltage to the corresponding universal frequency converter and controls the operating frequencies of the two universal frequency converters.
In this embodiment, as an optional implementation manner, the control switching unit is adapted to perform overall control on the controllable rectifier set and the inverter set, and integrate a plurality of different communication ports into one communication port to communicate with the air conditioner controller.
In summary, the invention realizes the normal power supply of the inverter by the controllable rectifier under the normal state and the special power supply mode under the fault state by acquiring the working state signals output by the controllable rectifier and the inverter, ensures the normal work of the air conditioning unit as much as possible, and improves the redundant power supply capacity under the fault state; the controllable rectifier can realize the cross power supply of the inverter when one controllable rectifier and one inverter of two sets of mutually independent low-harmonic frequency converter systems simultaneously fail; under the condition that one controllable rectifier has a fault, the normal work of the two inverters with the air-conditioning compressor can be ensured; when two devices of the same system have faults, the states of the two fault devices can be judged again, so that accurate fault devices are determined and controlled; when the universal frequency converter is used at the rear stage, if two controllable rectifiers have faults, the two on-state frequency converters can be used for supplying power to the compressor directly, and the safety of train passengers can be ensured in emergency; the two sets of frequency converters are subjected to master control, the control is flexible, the communication is convenient, the reliability of the frequency converters is improved, and the normal operation of an air conditioning unit and a train and the safety of passengers are ensured.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (12)
1. The utility model provides an air conditioner low harmonic converter control system which characterized in that includes:
the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; wherein
The control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit;
and the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction.
2. The air conditioner low harmonic inverter control system of claim 1,
the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage;
the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier;
when the normal signals of the first controllable rectifier, the second controllable rectifier, the first inverter and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends the starting signals of the first inverter and the second inverter to the control switching unit, namely
The control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter, controls the second controllable rectifier to output the second bus voltage to the second inverter, and controls the first inverter and the second inverter to start.
3. The air conditioner low harmonic inverter control system of claim 1,
the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage;
the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier;
when the normal signals of the first controllable rectifier, the second controllable rectifier and the second inverter and the fault signal of the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a starting signal of the second inverter to the control switching unit, namely
The control switching unit controls the second controllable rectifier to output a second bus voltage to the second inverter and controls the second inverter to start; and
when the normal signal of the first controllable rectifier, the second controllable rectifier, the first inverter and the fault signal of the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a starting signal of the first inverter to the control switching unit, namely
The control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter and controls the first inverter to start.
4. The air conditioner low harmonic inverter control system of claim 1,
the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage;
the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier;
when the normal signal of the second controllable rectifier and the first inverter and the fault signal of the first controllable rectifier and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a starting signal of the first inverter to the control switching unit, namely
The control switching unit controls the second controllable rectifier to output a second bus voltage to the first inverter and controls the first inverter to start; and
when the normal signals of the first controllable rectifier and the second inverter and the fault signals of the second controllable rectifier and the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends a starting signal of the second inverter to the control switching unit, namely
The control switching unit controls the first controllable rectifier to output the first bus voltage to the second inverter and controls the second inverter to start.
5. The air conditioner low harmonic inverter control system of claim 1,
the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage;
the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier;
when the normal signals of the second controllable rectifier, the first inverter and the second inverter and the fault signal of the first controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends the starting signals of the first inverter and the second inverter to the control switching unit, namely the starting signals of the first inverter and the second inverter are sent to the control switching unit
The control switching unit controls the second controllable rectifier to output a second bus voltage to the first inverter and the second inverter and controls the first inverter and the second inverter to start by reducing rated power; and
when the normal signals of the first controllable rectifier, the first inverter and the second inverter and the fault signal of the second controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends the starting signals of the first inverter and the second inverter to the control switching unit, namely the starting signals of the first inverter and the second inverter are sent to the control switching unit
The control switching unit controls the first controllable rectifier to output the first bus voltage to the first inverter and the second inverter, and controls the first inverter and the second inverter to carry out rated power reduction starting.
6. The air conditioner low harmonic inverter control system of claim 1,
the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage;
the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier;
when the normal signals of the second controllable rectifier and the second inverter and the fault signals of the first controllable rectifier and the first inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller is suitable for controlling the controllable rectifier and the inverter which are arranged in a crossed mode to carry out cross power supply through the control switching unit and judging the fault signals again, namely
If the first controllable rectifier and the first inverter recover to be normal, cross power supply is kept;
if the first inverter is recovered to be normal, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode; and
when the normal signal of the first controllable rectifier and the first inverter and the fault signal of the second controllable rectifier and the second inverter are sent to the air conditioner controller through the control switching unit, the air conditioner controller is suitable for controlling the controllable rectifier and the inverter which are arranged in a crossed mode to carry out cross power supply through the control switching unit and judging the fault signal again, namely
If the second controllable rectifier and the second inverter recover to be normal, cross power supply is kept;
and if the second inverter is recovered to be normal, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode.
7. The air conditioner low harmonic inverter control system of claim 1,
the two controllable rectifiers are a first controllable rectifier and a second controllable rectifier which are connected with three-phase voltage;
the two inverters are respectively matched with the first controllable rectifier and the second controllable rectifier;
the first inverter and the second inverter are both universal frequency converters, namely
When fault signals of the first controllable rectifier and the second controllable rectifier are sent to the air conditioner controller through the control switching unit, the air conditioner controller sends starting signals of the first inverter and the second inverter to the control switching unit, and the control switching unit controls the first inverter and the second inverter to be connected to three-phase voltage and controls the first inverter and the second inverter to be started.
8. A control method for a low-harmonic frequency converter of an air conditioner is characterized by comprising the following steps:
the air conditioner comprises an air conditioner controller, a control switching unit electrically connected with the air conditioner controller, at least two controllable rectifiers and two inverters matched with the two controllable rectifiers; wherein
The control switching unit is suitable for acquiring fault parameters of the controllable rectifier and/or the inverter and sending the fault parameters to the air conditioner controller, and the air conditioner controller generates an inverter adjusting instruction corresponding to the fault parameters to the control switching unit;
and the control switching unit controls the corresponding inverter to work according to the inverter adjusting instruction.
9. The control method of the low-harmonic inverter of the air conditioner according to claim 8,
and if the controllable rectifier and the inverter which are arranged in a crossed manner have faults simultaneously, the control switching unit starts the other controllable rectifier and the other controllable inverter to work in a crossed power supply manner.
10. The control method of the low-harmonic inverter of the air conditioner according to claim 8,
if one of the controllable rectifiers fails, the control switching unit starts the two inverters in a one-to-two power supply mode and controls the two inverters in a frequency reduction mode.
11. The control method of the low-harmonic inverter of the air conditioner according to claim 8,
the control method of the air conditioner low-harmonic frequency converter is suitable for judging that the corresponding controllable rectifier and the inverter have faults at the same time through cross power supply, and the control switching unit selects the other controllable rectifiers to supply power to the inverter.
12. The control method of the low-harmonic inverter of the air conditioner according to claim 8,
the inverter being a universal frequency converter, i.e.
When the two controllable rectifiers simultaneously break down, the control switching unit connects the three-phase voltage to the corresponding universal frequency converter and controls the working frequency of the two universal frequency converters.
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