CN118091219A - Battery simulator switching system and control method thereof - Google Patents
Battery simulator switching system and control method thereof Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention provides a battery simulator switch system and a control method thereof, which relate to the technical field of battery simulators and comprise an input starting impact and maintenance switch group, an output starting impact and stop discharge switch group, a battery simulator strong current system and a battery simulator weak current system, wherein the input starting impact and maintenance switch group comprises a discharge protection switch, an alternating current contactor K1 and a soft start alternating current contactor K2, the battery simulator Jiang Dianji system comprises an ACDC (alternating current direct current) part and a DCDC (direct current) part, and the output starting impact and stop discharge switch group comprises an output alternating current contactor K3 and an output soft start alternating current contactor K4.
Description
Technical Field
The invention relates to the technical field of battery simulators, in particular to a battery simulator switching system and a control method thereof.
Background
With the development of new energy automobiles, a battery simulator becomes necessary equipment for testing three-electric systems of the new energy automobiles. The battery simulator is mainly used for simulating a power battery and realizing related tests. The stability and reliability of the battery simulator electrical system directly affect the safety and reliability of the battery simulator itself and the experimental test object.
The battery simulator has complicated control, poor safety and poor stability of an electrical system due to high voltage, high current and high power level. The battery simulator has more internal electrical control units and relatively complex control, and a set of excellent switch control system can greatly improve the functions and performances of the battery simulator. For example, when the battery simulator is maintained, strong electricity cannot be independently controlled and stripped, and the maintenance and test processes are dangerous. The input and output starting processes of the battery simulator have large impact and cause damage to the battery simulator and other equipment over time. The battery simulator fan can not regulate speed, and is low in efficiency and large in noise. The battery simulator has high voltage, high current and high power level, and the current direct-current contactor has the defects of weak current-carrying capacity and easy adhesion of electric shock.
Aiming at the problems, a battery simulator switching system and a control scheme are explored, and the battery simulator switching system has certain research value and practical value.
Disclosure of Invention
The invention aims to provide a battery simulator switch system and a control method thereof, which can realize the effects of strong and weak current stripping during maintenance, no impact in the input and output starting processes, multi-gear speed regulation of a cooling fan, bus discharging in a standing state and the like.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme:
a battery simulator switching system, comprising: the system comprises an input start impact and maintenance switch group, an output start impact and shutdown discharge switch group, a fan speed regulation switch group, a battery simulator strong current system and a battery simulator weak current system;
The input starting impact and maintenance switch group is connected with the mains supply, the battery simulator strong current system is connected with the input starting impact and maintenance switch group, the output starting impact and stop discharging switch group is connected with the battery simulator strong current system, and the fan speed regulating switch group is respectively connected with the input starting impact and maintenance switch group and the battery simulator weak current system.
Further, the input starting impact and maintenance switch group comprises a discharge protection switch, an alternating current contactor K1 and a soft starting alternating current contactor K2;
The output starting impact and stopping discharging switch group comprises an output alternating current contactor K3 and an output soft starting alternating current contactor K4;
the FAN speed regulating switch group comprises an autotransformer, one or more AC contactors and n FANs FAN1 and FAN2 … … FANn;
The battery simulator Jiang Dianji system comprises an ACDC part and a DCDC part, wherein the ACDC is used for converting commercial power into a direct current bus Udc, and the DCDC part is used for converting the direct current bus Udc into a battery simulator output Uo;
The battery simulator weak current system includes a plurality of control relays.
Further, the input start impact and repair switch set includes: powering on an air circuit breaker JI, an alternating current contactor K1, maintaining an air circuit breaker J2, a soft start alternating current contactor K2 and soft start resistors Ra, rb and Rc;
Three-phase mains supply is respectively connected with input terminals 1, 3 and 5 of a power-on air circuit breaker JI, output terminals 2, 4 and 6 of the power-on air circuit breaker JI are respectively connected with input terminals 1, 3 and 5 of an alternating current contactor K1, output terminals 2, 4 and 6 of the power-on air circuit breaker JI are respectively connected with input terminals 1, 3 and 5 of a maintenance air circuit breaker J2, input terminal 7 of the maintenance air circuit breaker J2 is connected with a zero line N of the mains supply, output terminal 8 of the maintenance air circuit breaker J2 is connected with a control terminal A1 of an alternating current contactor K1 and a control terminal K2, the control terminal A2 of the alternating current contactor K1 is connected with a control signal C2, output terminals 2, 4 and 6 of the maintenance air circuit breaker J2 are connected with input terminals 1, 3 and 5 of a soft-start alternating current contactor K2, output terminals 2, 4 and 6 of the soft-start resistors Ra, rb and Rb are respectively connected with one end of the soft-start resistors Ra, rb and Rb, K1 and Rc are respectively connected with the output terminals 2 and 4 of the strong-current system after the soft-start resistors K2 and Rc are connected with the strong-power system;
the control signals C1 and C2 are respectively controlled by relays X1 and X2 in a weak current system of the battery simulator.
Further, the output start-up surge and shutdown discharge switch group includes: the output alternating-current contactor K3, the output soft-start alternating-current contactor K4, the output soft-start resistor R2, the discharge protection switch K9 and the discharge resistor R3;
The battery simulator Jiang Dianji is characterized in that an output end Uo+ of the battery simulator Jiang Dianji is connected with an output alternating-current contactor K3 and an input terminal 1 of an output soft-start alternating-current contactor K4, the input terminals 3 and 5 of the output alternating-current contactor K3 are in short circuit, the output terminals 2 and 4 are in short circuit, an output terminal 6 is connected with one end of an output soft-start resistor R2, one end of a discharge resistor R3 and an output positive electrode DC+ of a motor simulator at one point, the other end of the output soft-start resistor R2 is connected with an output terminal 6 of the output soft-start alternating-current contactor K4, the input terminals 3 and 5 of the output soft-start alternating-current contactor K4 are in short circuit, the output terminals 2 and 4 are in short circuit, the other end of the discharge resistor R3 is connected with the upper end of a discharge protection switch K9, the lower end of the discharge protection switch K9 is connected with a negative electrode DC-of the motor simulator, a control terminal A2 of the output soft-start alternating-current contactor K4 is connected with a commercial power zero line N, a control signal C3 is connected with a control terminal A1 of the output soft-start alternating-current contactor K4, a control signal C4 is connected with a control terminal A1 of the output soft-start alternating-current contactor K4, and control signals C4 are respectively connected with a control signal C4, and a control signal C3 and a relay X3 in the battery simulator is respectively controlled by a weak-current system X.
Further, fan speed governing switch group includes: autotransformer AT, AC contactors K5, K6, K7, n FANs FAN1, FAN2 … … FANn;
The head end 0 of the autotransformer AT is connected with a mains supply zero line N, and the tail section Hi of the autotransformer is connected with an output terminal 2 of the power-on air circuit breaker JI; the input terminals 3 of the alternating-current contactors K5, K6 and K7 are respectively short-circuited with the respective input terminals 5, the output terminals 2 are respectively short-circuited with the respective input terminals 4, the control terminal A2 is connected with the mains supply zero line N, and the output terminals 6 are connected with the upper ends of the FANs FAN1 and FAN2 … … FANn after being connected at one point; the input terminal 1 of the alternating current contactor K5 is connected with the tail section Hi of the autotransformer, the input terminal 1 of the alternating current contactor K6 is connected with the second tap Me of the autotransformer, and the input terminal 1 of the alternating current contactor K7 is connected with the first tap Lo of the autotransformer; the lower ends of the FANs FAN1 and FAN2 … … FANn are connected with the head end 0 of the autotransformer; the control terminal A1 of the alternating-current contactor K5 is connected with the control signal C5, the control terminal A1 of the alternating-current contactor K6 is connected with the control signal C6, the control terminal A1 of the alternating-current contactor K7 is connected with the control signal C7, and the control signals C5, C6 and C7 are controlled by the relays X5, X6 and X7 in the weak current system of the battery simulator respectively.
Further, the device also comprises a static discharge switch which is connected with the weak current system of the battery simulator and the strong current system of the battery simulator;
The static discharge switch K8 is a normally closed direct current contactor, a terminal 1 of the static discharge switch K8 is connected with a positive electrode udc+ of a system bus of the battery simulator Jiang Dianji, the other end of the static discharge switch K8 is connected with one end of the discharge resistor R1, the other end of the discharge resistor R1 is connected with a negative electrode Udc-of a system bus of the battery simulator Jiang Dianji, two control ends of the static discharge switch are respectively connected with a control signal C8 and a ground GND of a weak current system of the battery simulator, and the control signal C8 is controlled by a relay X8 in the weak current system of the battery simulator.
Further, the discharge protection switch K9 is an IGBT or MOSfet switch tube.
A control method of a battery simulator switch system is used for controlling the battery simulator switch system and comprises input start impact and maintenance switch set control logic during normal operation, input start impact and maintenance switch set control logic during maintenance, output start impact and shutdown discharge related set control logic and fan speed regulation switch set control logic:
the input start impact and maintenance switch group control logic during normal operation is as follows:
In the input starting process, the commercial power firstly passes through a soft start alternating current contactor K2 and soft start resistors Ra, rb and Rc at the time t0 to precharge a bus capacitor of a battery simulator Jiang Dianji system, and the bus capacitor reaches the precharge voltage after the soft start time; at the moment t1, the alternating current contactor K1 is attracted, and the commercial current passes through the alternating current contactor K1; the soft start alternating current contactor K2 is disconnected at the moment t2, and soft start resistors Ra, rb and Rc are separated from the strong current system of the mains supply and the battery simulator;
the input start impact and maintenance switch group control logic during maintenance is as follows:
the alternating-current contactor K1, the soft-start alternating-current contactor K2 and the mains supply zero line are disconnected, so that the mains supply and the battery simulator Jiang Dianji are disconnected, and the battery simulator is subjected to safety test maintenance under the weak current power supply;
The output start-up impact and shutdown discharge related group control logic is as follows:
When no abnormal alarm exists, the output of the battery simulator is started at the time t0, the soft start alternating current contactor K4 is closed, the alternating current contactor K3 is closed at the time t1 after the output soft start time, the soft start alternating current contactor K4 is opened at the time t2, and the output of the battery simulator is stopped at the time t 3; when abnormality alarm exists, the battery simulator outputs and starts at the moment t0, the output soft start alternating current contactor K4 is closed, the output alternating current contactor K3 is closed at the moment t1 after the output soft start time, the system abnormality alarm at the moment t1', the output alternating current contactor K3 and the output soft start alternating current contactor K4 are opened, and the discharge protection switch is closed;
the fan speed regulation switch group control logic is as follows:
When the temperature rises but is lower than T0, the alternating current contactors K5, K6 and K7 are disconnected, and the fan does not rotate;
when the temperature rises to T0, the alternating current contactor K7 is closed, the first tap Lo of the autotransformer supplies power to the fan, and the fan runs at low-gear wind speed;
When the temperature continues to rise to T1, the alternating current contactor K7 is opened, after the safety time td passes, the alternating current contactor K6 is closed, the second tap Me of the autotransformer supplies power to the fan, and the fan runs at a medium-speed wind speed;
When the temperature continues to rise to T2, the alternating-current contactor K6 is opened, after the safety time td passes, the alternating-current contactor K5 is closed, the tail end Hi of the autotransformer supplies power to the fan, and the fan runs at high-grade wind speed;
When the temperature is reduced but is higher than T2, the alternating current contactor K5 is closed, the tail end Hi of the autotransformer supplies power to the fan, and the fan runs at high-speed wind speed;
When the temperature is reduced to T2, the alternating current contactor K5 is opened, after the safety time td passes, the alternating current contactor K6 is closed, the second tap Me of the autotransformer supplies power to the fan, and the fan runs at a medium-speed wind speed;
when the temperature is reduced to T1, the alternating-current contactor K6 is opened, after the safety time td passes, the alternating-current contactor K7 is closed, the first tap Lo of the autotransformer supplies power to the fan, and the fan runs at a low-gear wind speed;
when the temperature continues to drop to T0, the alternating current contactor K7 is disconnected, and the fan stops running;
Wherein T0 is a low-grade temperature threshold of the fan, T1 is a medium-grade temperature threshold of the fan, T2 is a high-grade temperature threshold of the fan, and T0 is less than T1 is less than T2.
Further, in the control logic of the input start impact and maintenance switch group during normal operation, the maintenance air circuit breaker J2 is manually closed and kept normally closed, the power-on air circuit breaker JI is manually closed, the system works, and the manual opening system stops working; at time t0, the power-on air circuit breaker JI is manually closed, the soft start alternating current contactor K2 is closed, and the soft start time is entered; manually opening the power-on air circuit breaker JI at the time t 3;
in the control logic of the input start impact and maintenance switch group during maintenance, the maintenance air circuit breaker J2 is manually disconnected, so that the control terminals A1 of the alternating current contactor K1 and the soft start alternating current contactor K2 are disconnected from the mains supply zero line N.
Further, the method also comprises a static discharge logic:
The static discharge switch K8 is a normally closed direct current contactor, after the power-on air circuit breaker JI is manually closed, the weak current system of the battery simulator controls the contactor X8 to control the K8 to be opened, after the power-on air circuit breaker JI is manually opened, the static discharge switch K8 is automatically closed, the bus capacitor is discharged through the K8 and the discharge resistor R1, and no residual electric quantity exists in the simulator under the static condition.
The invention has the advantages that: the battery simulator switching system and the control method thereof effectively solve the problems that the battery simulator is complicated in control, poor in safety and poor in stability due to high voltage, high current and high power level, and the AC contactor is successfully used in a high-voltage and high-current DC occasion, so that the defects of weak current-carrying capacity and easy adhesion of electric shock of the DC contactor are overcome, and the overall stability and reliability of the battery simulator are improved.
Drawings
FIG. 1 is a schematic diagram of a battery simulator switching system;
FIG. 2 is a logic diagram of the control of the input start up surge and maintenance switch set during normal operation;
FIG. 3 is a logic diagram for controlling the output of an abnormal alarm for starting up the surge and stopping the discharge switch set;
FIG. 4 is a logic diagram for controlling the output of an abnormal alarm for a start-up surge and shutdown discharge switch set;
FIG. 5 is a logic diagram of fan speed control switch set control when temperature rises;
fig. 6 is a logic diagram of fan speed control switch set control as temperature drops.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
The embodiment proposes a battery simulator switch system, please refer to fig. 1, which includes an input start-up impact and maintenance switch set, an output start-up impact and shutdown discharge switch set, a battery simulator strong current system, a battery simulator weak current system, a fan speed regulation switch set, and a standing discharge switch.
The input start impact and repair switch set includes: the power-on air circuit breaker JI, the alternating-current contactor K1, the maintenance air circuit breaker J2, the soft-start alternating-current contactor K2 and the soft-start resistors Ra, rb and Rc. The three-phase mains supply is respectively connected with input terminals 1,3 and 5 of a power-on air circuit breaker JI, output terminals 2, 4 and 6 of the power-on air circuit breaker JI are respectively connected with input terminals 1,3 and 5 of an alternating current contactor K1, output terminals 2, 4 and 6 of the power-on air circuit breaker JI are respectively connected with input terminals 1,3 and 5 of a maintenance air circuit breaker J2, input terminal 7 of the maintenance air circuit breaker J2 is connected with a zero line N of the mains supply, output terminal 8 of the maintenance air circuit breaker J2 is connected with a control terminal A1 of an alternating current contactor K1 and K2, a control terminal A2 of the alternating current contactor K1 is connected with a control signal C2, output terminals 2, 4 and 6 of the maintenance air circuit breaker J2 are connected with input terminals 1,3 and 5 of a soft start alternating current contactor K2, output terminals 2, 4 and 6 of the soft start alternating current contactor K2 are connected with one ends of soft start resistors Ra, rb and Rb, and the other ends of the soft start resistors K2 and Rb are respectively connected with output terminals 2 and 4 of an analog system strong electric system.
The output start-up impact and shutdown discharge switch group includes: the output alternating-current contactor K3, the output soft-start alternating-current contactor K4, the output soft-start resistor R2, the discharge protection switch K9 and the discharge resistor R3. The battery simulator Jiang Dianji is connected with the input terminals 1 of the output alternating-current contactor K3 and the output soft-start alternating-current contactor K4, the input terminals 3 and 5 of the output alternating-current contactor K3 are in short circuit, the output terminals 2 and 4 are in short circuit, the output terminal 6 is connected with one end of the output soft-start resistor R2, one end of the discharge resistor R3 and the output positive electrode DC+ of the motor simulator at one point, the other end of the output soft-start resistor R2 is connected with the output terminal 6 of the output soft-start alternating-current contactor K4, the input terminals 3 and 5 of the output soft-start alternating-current contactor K4 are in short circuit, the output terminals 2 and 4 are in short circuit, the other end of the discharge resistor R3 is connected with the upper end of the discharge protection switch K9, the lower end of the discharge protection switch K9 is connected with the output negative electrode DC-of the motor simulator, the control terminal A2 of the output soft-start alternating-current contactor K4 is connected with the mains zero line N, the control terminal A1 of the output alternating-current contactor K3 is connected with the control signal C3, and the control terminal A1 of the output soft-start alternating-current contactor K4 is connected with the control signal C4. The AC contactor is successfully used in high-voltage high-current DC occasions by outputting the starting impact and stopping discharge switch group.
The battery simulator strong current system and the battery simulator weak current system are both connected with the input starting impact and maintenance switch group and comprise an ACDC part and a DCDC part, wherein the ACDC converts commercial power into a direct current bus Udc, and the DCDC part converts the direct current bus Udc into a battery simulator output Uo.
The weak current system of the battery simulator comprises relays X1 and X2 … … X9, one ends of the relays X1 and X2 … … X7 are connected with an output terminal 2 of the power-on air circuit breaker JI, and the other ends of the relays X1 and X2 … … X7 sequentially output control signals C1 and C2 … … C7; one end of the relay X8 is connected with a +24V power supply, and the other end of the relay X8 generates a C8 control signal; one end of the relay X9 is connected with an ON signal, and the other end of the relay X9 generates a C9 control signal.
The fan speed regulation switch group includes: autotransformer AT, AC contactors K5, K6, K7, n FANs FAN1, FAN2 … … FANn. The head end 0 of the autotransformer AT is connected with a mains supply zero line N, and the tail section Hi of the autotransformer is connected with an output terminal 2 of the power-on air circuit breaker JI; the input terminals 3 of the alternating-current contactors K5, K6 and K7 are respectively short-circuited with the respective input terminals 5, the output terminals 2 are respectively short-circuited with the respective input terminals 4, the control terminal A2 is connected with the mains supply zero line N, and the output terminals 6 are connected with the upper ends of the FANs FAN1 and FAN2 … … FANn after being connected at one point; the input terminal 1 of the alternating current contactor K5 is connected with the tail section Hi of the autotransformer, the input terminal 1 of the alternating current contactor K6 is connected with the second tap Me of the autotransformer, and the input terminal 1 of the alternating current contactor K7 is connected with the first tap Lo of the autotransformer; the lower ends of the FANs FAN1 and FAN2 … … FANn are connected with the head end 0 of the autotransformer; the control terminal A1 of the ac contactor K5 is connected to the control signal C5, the control terminal A1 of the ac contactor K6 is connected to the control signal C6, and the control terminal A1 of the ac contactor K7 is connected to the control signal C7.
The static discharge switch K8 is a normally closed direct current contactor, a terminal 1 of the static discharge switch K8 is connected with a positive electrode udc+ of a system bus of the battery simulator Jiang Dianji, the other end of the static discharge switch K8 is connected with one end of the discharge resistor R1, the other end of the discharge resistor R1 is connected with a negative electrode Udc-of a system bus of the battery simulator Jiang Dianji, two control ends of the static discharge switch are respectively connected with a control signal C8 and a ground GND of a weak current system of the battery simulator, and the control signal C8 is controlled by a relay X8 in the weak current system of the battery simulator.
Example 2
The embodiment provides a control method of a battery simulator switch system, which is used for controlling the battery simulator switch system of the embodiment 1, and comprises input start impact and maintenance switch set control logic during normal operation, input start impact and maintenance switch set control logic during maintenance, output start impact and shutdown discharge switch set control logic, fan speed regulation switch set control logic and standing discharge logic.
The service air circuit breaker J2 is manually closed and kept normally closed. The power-on air circuit breaker JI is operated by a manual closing system and the manual opening system is stopped. Referring to fig. 2, the input start impact and maintenance switch set control logic during normal operation is: the power-on air circuit breaker JI is manually closed at the time t0, the relay X2 controls the soft-start alternating-current contactor K2 to be closed, the relay X1 controls the alternating-current contactor K1 to be closed at the time t1 after the soft-start time t1 is elapsed, the relay X2 controls the soft-start alternating-current contactor K2 to be opened at the time t2, and the alternating-current contactor K1 is kept closed until the power-on air circuit breaker JI is manually opened at the time t 3. The effect is as follows: in the input starting process, the commercial power firstly pre-charges the bus capacitor of the battery simulator Jiang Dianji through the soft start alternating current contactor K2 and soft start resistors Ra, rb and Rc, the bus capacitor reaches the pre-charging voltage after the soft start time passes through soft start time t1-t0, and then the current impact of the commercial power on the bus capacitor of the battery simulator in the input starting process is avoided by sucking the alternating current contactor K1. After the time t2, the soft start alternating current contactor K2 is disconnected, soft start resistors Ra, rb and Rc are separated from the commercial power and the battery simulator strong current system, and the soft start resistors Ra, rb and Rc are not burnt even if the alternating current contactor K1 is abnormally disconnected.
The input start impact and maintenance switch group control logic during maintenance is as follows: when the maintenance is ready, the maintenance air breaker J2 is manually disconnected, so that the control terminals A1 of the alternating-current contactor K1 and the soft-start alternating-current contactor K2 are disconnected from the mains supply zero line N, the mains supply and the battery simulator Jiang Dianji are disconnected, and the safety test maintenance is carried out on the battery simulator only under weak current power supply.
Referring to fig. 3, when the output start impact and shutdown discharge related group control logic has no abnormal alarm, the battery simulator outputs and starts at the time t0, the relay X4 controls the output soft start ac contactor K4 to be closed, the relay X3 controls the output ac contactor K3 to be closed after the output soft start time t1-t0, and the relay X4 controls the output soft start ac contactor K4 to be opened at the time t2 until the output of the battery simulator stops at the time t 3. And the starting impact of the output starting of the battery simulator on the external tested equipment is avoided.
Referring to fig. 4, when an abnormal alarm exists, the output of the t0 battery simulator is started, the relay X4 controls the output soft start alternating current contactor K4 to be closed, the relay X3 controls the output alternating current contactor K3 to be closed after the output soft start time t1-t0, the system abnormal alarm is performed at the time t1', the relay X3X4 controls the output alternating current contactor K3 to be disconnected from the output soft start alternating current contactor K4, the relay X3 controls the discharge protection switch K9 to be closed, and the external tested equipment releases energy through the electric protection switch K9 and the discharge resistor R3 so as to avoid damage. In order to ensure that the cut-in time of the discharge protection is short enough when the system alarms abnormally, the discharge protection switch K9 is an IGBT or MOSfet switch tube.
Referring to fig. 5, when the control logic temperature of the fan speed regulating switch set rises and is lower than T0, the initial state relays X5, X6 and X7 control the ac contactors K5, K6 and K7 to be disconnected, so that the fan does not rotate; when the temperature rises to T0, the relay X7 controls the alternating current contactor K7 to be closed, the first tap Lo of the autotransformer supplies power to the FAN, and the FAN FAN1 to FANn runs at low-speed wind speed; when the temperature continues to rise to T1, the relay X7 controls the alternating current contactor K7 to be opened, after the safety time td passes, the relay X6 controls the alternating current contactor K6 to be closed, the second tap Me of the autotransformer supplies power to the FAN, and the FANs FAN1 to FANn run at medium-speed wind speed; when the temperature continues to rise to T2, the relay X6 controls the alternating current contactor K6 to be opened, after the safety time td passes, the relay X5 controls the alternating current contactor K5 to be closed, the autotransformer tail end Hi supplies power to the FAN, and the FANs FAN1 to FANn operate at high-speed wind speeds. FAN1 through FANn is ac power supply, voltage speed regulation FAN.
Referring to fig. 6, when the temperature is reduced and is higher than T2, the temperature is high at the beginning, the relay X5 controls the ac contactor K5 to be closed, the autotransformer terminal Hi supplies power to the FAN, and the FAN1 to FANn operates at high-speed wind speed; when the temperature is reduced to T2, the relay X5 controls the alternating current contactor K5 to be opened, after the safety time td passes, the relay X6 controls the alternating current contactor K6 to be closed, the second tap Me of the autotransformer supplies power to the FAN, and the FANs FAN1 to FANn run at medium-speed wind speed; when the temperature continues to drop to T1, the relay X6 controls the alternating current contactor K6 to be opened, after the safety time td passes, the relay X7 controls the alternating current contactor K7 to be closed, the first tap Lo of the autotransformer supplies power to the FAN, and the FANs FAN1 to FANn run at low-speed wind speed; when the temperature continues to drop to T0, the relay X7 controls the alternating-current contactor K7 to be disconnected, and the fan stops running.
Wherein T0 is a low-grade temperature threshold of the fan, T1 is a medium-grade temperature threshold of the fan, T2 is a high-grade temperature threshold of the fan, and T0 is less than T1 is less than T2.
Further, the method further comprises the following steps:
The static discharge logic is as follows: the static discharge switch K8 is a normally closed direct current contactor, after the power-on air circuit breaker JI is manually closed, the weak current system of the battery simulator controls the contactor X8 to control the K8 to be opened, after the power-on air circuit breaker JI is manually opened, the static discharge switch K8 is automatically closed, the bus capacitor is discharged through the K8 and the discharge resistor R1, and no residual electric quantity exists in the simulator under the static condition.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A battery simulator switching system, comprising: the system comprises an input start impact and maintenance switch group, an output start impact and shutdown discharge switch group, a fan speed regulation switch group, a battery simulator strong current system and a battery simulator weak current system;
The input starting impact and maintenance switch group is connected with the mains supply, the battery simulator strong current system is connected with the input starting impact and maintenance switch group, the output starting impact and stop discharging switch group is connected with the battery simulator strong current system, and the fan speed regulating switch group is connected with the input starting impact and maintenance switch group and the battery simulator weak current system respectively.
2. The battery simulator switch system of claim 1 wherein the input start shock and repair switch set comprises a discharge protection switch, an ac contactor K1 and a soft start ac contactor K2;
The output starting impact and stopping discharging switch group comprises an output alternating current contactor K3 and an output soft starting alternating current contactor K4;
the FAN speed regulating switch group comprises an autotransformer, one or more AC contactors and n FANs FAN1 and FAN2 … … FANn;
The battery simulator Jiang Dianji system comprises an ACDC part and a DCDC part, wherein the ACDC is used for converting commercial power into a direct current bus Udc, and the DCDC part is used for converting the direct current bus Udc into a battery simulator output Uo;
The battery simulator weak current system includes a plurality of control relays.
3. The battery simulator switch system of claim 1 wherein the input actuation shock and repair switch set comprises: powering on an air circuit breaker JI, an alternating current contactor K1, maintaining an air circuit breaker J2, a soft start alternating current contactor K2 and soft start resistors Ra, rb and Rc;
Three-phase mains supply is respectively connected with input terminals 1, 3 and 5 of a power-on air circuit breaker JI, output terminals 2, 4 and 6 of the power-on air circuit breaker JI are respectively connected with input terminals 1, 3 and 5 of an alternating current contactor K1, output terminals 2, 4 and 6 of the power-on air circuit breaker JI are respectively connected with input terminals 1, 3 and 5 of a maintenance air circuit breaker J2, input terminal 7 of the maintenance air circuit breaker J2 is connected with a zero line N of the mains supply, output terminal 8 of the maintenance air circuit breaker J2 is connected with a control terminal A1 of an alternating current contactor K1 and a control terminal K2, the control terminal A2 of the alternating current contactor K1 is connected with a control signal C2, output terminals 2, 4 and 6 of the maintenance air circuit breaker J2 are connected with input terminals 1, 3 and 5 of a soft-start alternating current contactor K2, output terminals 2, 4 and 6 of the soft-start resistors Ra, rb and Rb are respectively connected with one end of the soft-start resistors Ra, rb and Rb, K1 and Rc are respectively connected with the output terminals 2 and 4 of the strong-current system after the soft-start resistors K2 and Rc are connected with the strong-power system;
the control signals C1 and C2 are respectively controlled by relays X1 and X2 in a weak current system of the battery simulator.
4. The battery simulator switch system of claim 1 wherein the output start-up surge and shutdown discharge switch set comprises: the output alternating-current contactor K3, the output soft-start alternating-current contactor K4, the output soft-start resistor R2, the discharge protection switch K9 and the discharge resistor R3;
The battery simulator Jiang Dianji is characterized in that an output end Uo+ of the battery simulator Jiang Dianji is connected with an output alternating-current contactor K3 and an input terminal 1 of an output soft-start alternating-current contactor K4, the input terminals 3 and 5 of the output alternating-current contactor K3 are in short circuit, the output terminals 2 and 4 are in short circuit, an output terminal 6 is connected with one end of an output soft-start resistor R2, one end of a discharge resistor R3 and an output positive electrode DC+ of a motor simulator at one point, the other end of the output soft-start resistor R2 is connected with an output terminal 6 of the output soft-start alternating-current contactor K4, the input terminals 3 and 5 of the output soft-start alternating-current contactor K4 are in short circuit, the output terminals 2 and 4 are in short circuit, the other end of the discharge resistor R3 is connected with the upper end of a discharge protection switch K9, the lower end of the discharge protection switch K9 is connected with a negative electrode DC-of the motor simulator, a control terminal A2 of the output soft-start alternating-current contactor K4 is connected with a commercial power zero line N, a control signal C3 is connected with a control terminal A1 of the output soft-start alternating-current contactor K4, a control signal C4 is connected with a control terminal A1 of the output soft-start alternating-current contactor K4, and control signals C4 are respectively connected with a control signal C4, and a control signal C3 and a relay X3 in the battery simulator is respectively controlled by a weak-current system X.
5. The battery simulator switch system of claim 3 wherein the fan speed switch bank comprises: autotransformer AT, AC contactors K5, K6, K7, n FANs FAN1, FAN2 … … FANn;
The head end 0 of the autotransformer AT is connected with a mains supply zero line N, and the tail section Hi of the autotransformer is connected with an output terminal 2 of the power-on air circuit breaker JI; the input terminals 3 of the alternating-current contactors K5, K6 and K7 are respectively short-circuited with the respective input terminals 5, the output terminals 2 are respectively short-circuited with the respective input terminals 4, the control terminal A2 is connected with the mains supply zero line N, and the output terminals 6 are connected with the upper ends of the FANs FAN1 and FAN2 … … FANn after being connected at one point; the input terminal 1 of the alternating current contactor K5 is connected with the tail section Hi of the autotransformer, the input terminal 1 of the alternating current contactor K6 is connected with the second tap Me of the autotransformer, and the input terminal 1 of the alternating current contactor K7 is connected with the first tap Lo of the autotransformer; the lower ends of the FANs FAN1 and FAN2 … … FANn are connected with the head end 0 of the autotransformer; the control terminal A1 of the alternating-current contactor K5 is connected with the control signal C5, the control terminal A1 of the alternating-current contactor K6 is connected with the control signal C6, the control terminal A1 of the alternating-current contactor K7 is connected with the control signal C7, and the control signals C5, C6 and C7 are controlled by the relays X5, X6 and X7 in the weak current system of the battery simulator respectively.
6. The battery simulator switch system of claim 1, further comprising a stationary discharge switch coupled to the battery simulator weak current system, the battery simulator strong current system;
The static discharge switch K8 is a normally closed direct current contactor, a terminal 1 of the static discharge switch K8 is connected with a positive electrode Udc+ of a bus of the battery simulator Jiang Dianji, the other end of the static discharge switch K8 is connected with one end of the discharge resistor R1, the other end of the discharge resistor R1 is connected with a negative electrode Udc-of a bus of the battery simulator Jiang Dianji, two control ends of the static discharge switch are respectively connected with a control signal C8 and a ground GND of a weak current system of the battery simulator, and the control signal C8 is controlled by a relay X8 in the weak current system of the battery simulator.
7. The battery simulator switching system of claim 4, wherein the discharge protection switch K9 is an IGBT or MOSfet switching tube.
8. A control method for a battery simulator switch system, for controlling the battery simulator switch system according to any one of claims 1 to 7, comprising a normal operation input start-up impact and maintenance switch group control logic, a maintenance input start-up impact and maintenance switch group control logic, an output start-up impact and shutdown discharge switch group control logic, and a fan speed regulation switch group control logic:
the input start impact and maintenance switch group control logic during normal operation is as follows:
In the input starting process, the commercial power firstly passes through a soft start alternating current contactor K2 and soft start resistors Ra, rb and Rc at the time t0 to precharge a bus capacitor of a battery simulator Jiang Dianji system, and the bus capacitor reaches the precharge voltage after the soft start time; at the moment t1, the alternating current contactor K1 is attracted, and the commercial current passes through the alternating current contactor K1; the soft start alternating current contactor K2 is disconnected at the moment t2, and soft start resistors Ra, rb and Rc are separated from the strong current system of the mains supply and the battery simulator;
the input start impact and maintenance switch group control logic during maintenance is as follows:
the alternating-current contactor K1, the soft-start alternating-current contactor K2 and the mains supply zero line are disconnected, so that the mains supply and the battery simulator Jiang Dianji are disconnected, and the battery simulator is subjected to safety test maintenance under the weak current power supply;
The output start-up impact and shutdown discharge related group control logic is as follows:
When no abnormal alarm exists, the output of the battery simulator is started at the time t0, the soft start alternating current contactor K4 is closed, the alternating current contactor K3 is closed at the time t1 after the output soft start time, the soft start alternating current contactor K4 is opened at the time t2, and the output of the battery simulator is stopped at the time t 3; when abnormality alarm exists, the battery simulator outputs and starts at the moment t0, the output soft start alternating current contactor K4 is closed, the output alternating current contactor K3 is closed at the moment t1 after the output soft start time, the system abnormality alarm at the moment t1', the output alternating current contactor K3 and the output soft start alternating current contactor K4 are opened, and the discharge protection switch is closed;
the fan speed regulation switch group control logic is as follows:
When the temperature rises but is lower than T0, the alternating current contactors K5, K6 and K7 are disconnected, and the fan does not rotate;
when the temperature rises to T0, the alternating current contactor K7 is closed, the first tap Lo of the autotransformer supplies power to the fan, and the fan runs at low-gear wind speed;
When the temperature continues to rise to T1, the alternating current contactor K7 is opened, after the safety time td passes, the alternating current contactor K6 is closed, the second tap Me of the autotransformer supplies power to the fan, and the fan runs at a medium-speed wind speed;
When the temperature continues to rise to T2, the alternating-current contactor K6 is opened, after the safety time td passes, the alternating-current contactor K5 is closed, the tail end Hi of the autotransformer supplies power to the fan, and the fan runs at high-grade wind speed;
When the temperature is reduced but is higher than T2, the alternating current contactor K5 is closed, the tail end Hi of the autotransformer supplies power to the fan, and the fan runs at high-speed wind speed;
When the temperature is reduced to T2, the alternating current contactor K5 is opened, after the safety time td passes, the alternating current contactor K6 is closed, the second tap Me of the autotransformer supplies power to the fan, and the fan runs at a medium-speed wind speed;
when the temperature is reduced to T1, the alternating-current contactor K6 is opened, after the safety time td passes, the alternating-current contactor K7 is closed, the first tap Lo of the autotransformer supplies power to the fan, and the fan runs at a low-gear wind speed;
when the temperature continues to drop to T0, the alternating current contactor K7 is disconnected, and the fan stops running;
Wherein T0 is a low-grade temperature threshold of the fan, T1 is a medium-grade temperature threshold of the fan, T2 is a high-grade temperature threshold of the fan, and T0 is less than T1 is less than T2.
9. The control method of the battery simulator switch system according to claim 8, wherein in the normal operation input start-up impact and maintenance switch group control logic, the maintenance air circuit breaker J2 is manually closed and kept normally closed, the power-on air circuit breaker JI is manually closed, the system is operated, and the system is manually opened to stop the operation; at time t0, the power-on air circuit breaker JI is manually closed, the soft start alternating current contactor K2 is closed, and the soft start time is entered; manually opening the power-on air circuit breaker JI at the time t 3;
in the control logic of the input start impact and maintenance switch group during maintenance, the maintenance air circuit breaker J2 is manually disconnected, so that the control terminals A1 of the alternating current contactor K1 and the soft start alternating current contactor K2 are disconnected from the mains supply zero line N.
10. The battery simulator switch system control method of claim 8, further comprising a rest discharge logic:
The static discharge switch K8 is a normally closed direct current contactor, after the power-on air circuit breaker JI is manually closed, the weak current system of the battery simulator controls the contactor X8 to control the K8 to be opened, after the power-on air circuit breaker JI is manually opened, the static discharge switch K8 is automatically closed, the bus capacitor is discharged through the K8 and the discharge resistor R1, and no residual electric quantity exists in the simulator under the static condition.
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