CN112994418B - Switch tube driving circuit and refined reactive power compensation device - Google Patents

Switch tube driving circuit and refined reactive power compensation device Download PDF

Info

Publication number
CN112994418B
CN112994418B CN201911310909.6A CN201911310909A CN112994418B CN 112994418 B CN112994418 B CN 112994418B CN 201911310909 A CN201911310909 A CN 201911310909A CN 112994418 B CN112994418 B CN 112994418B
Authority
CN
China
Prior art keywords
circuit
resistor
control circuit
driving
driving chip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911310909.6A
Other languages
Chinese (zh)
Other versions
CN112994418A (en
Inventor
马洪亮
任俊辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hebei Vauban Power Technology Co ltd
Original Assignee
Hebei Vauban Power Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hebei Vauban Power Technology Co ltd filed Critical Hebei Vauban Power Technology Co ltd
Priority to CN201911310909.6A priority Critical patent/CN112994418B/en
Publication of CN112994418A publication Critical patent/CN112994418A/en
Application granted granted Critical
Publication of CN112994418B publication Critical patent/CN112994418B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention belongs to the technical field of electronic transformation, and provides a switching tube driving circuit and a refined reactive power compensation device, which comprise a driving chip, a push-pull circuit and a driving resistor which are sequentially connected, wherein the driving chip is used for being connected with a control circuit, and the driving resistor is used for being connected with a G pole of a switching tube; the device also comprises an isolation power supply, the driving chip is an isolated driving chip, and the driving chip and the push-pull circuit are both connected with the isolation power supply; the driving resistors include an eighth resistor, a ninth resistor, a sixty-second resistor, and a sixty-third resistor. Through above-mentioned technical scheme, the poor problem of reactive power compensator compensation effect among the prior art has been solved.

Description

Switch tube driving circuit and refined reactive power compensation device
Technical Field
The invention belongs to the technical field of electronic transformation, and relates to a switching tube driving circuit and a refined reactive power compensation device.
Background
The existing low-voltage reactive compensation products are mainly classified into the following three types:
1. step compensation: the most common design is to use several capacitors of the same capacity, where the step size is the capacity of a single capacitor. And calculating according to the standard value, and if the total compensation quantity is 1, the stepping step is the reciprocal of the number of the capacitors. For example: when 10 20Kvar capacitors are installed in one set of compensation device, the total compensation amount is 200Kvar, and the step size is 20Kvar. The step size is 1/10 per unit value. The design scheme is simple, and the capacitor can be circularly switched easily. The defect is that the step size is too large, even if 15 capacitors are installed, the step size is still 1/15, and when the load of a compensated user is light, a good compensation effect cannot be obtained.
2. Static var generator: static var generator, english description is: static Var Generator, abbreviated as SVG, is a device that performs dynamic reactive power compensation using a power semiconductor bridge converter with free commutation. SVG also has some problems: the price is too high, and the price of a set of static var generators is different from hundreds of thousands to millions, so that the popularization of the static var generators is greatly influenced; the consumption is very big because its theory of operation is IGBT phase shift principle, and IGBT can give out very big geothermal energy when switching on, therefore SVG need force the forced air cooling always, has caused the energy waste on the ground.
3. Active power filter: the dynamic tracking compensation method is characterized in that the method is described as Active power filter, APF for short, compensation current can be controlled and actively output by sampling load current and separating each harmonic from reactive power, corresponding current in the load is offset, dynamic tracking compensation is realized, and APF is complex to control and poor in compensation effect at present.
Disclosure of Invention
The invention provides a switching tube driving circuit and a refined reactive power compensation device, and solves the problem that the reactive power compensation device in the prior art is poor in compensation effect.
The technical scheme of the invention is realized as follows:
the utility model provides a switch tube drive circuit, is including the driver chip, push-pull circuit and the drive resistor that connect gradually, driver chip is used for being connected with control circuit, drive resistor is used for being connected with the G utmost point of switch tube.
The drive chip is an isolated drive chip, and the drive chip and the push-pull circuit are both connected with the isolated power supply.
Further, the driving resistors comprise an eighth resistor, a ninth resistor, a sixty-second resistor and a sixty-third resistor,
the eighth resistor is connected with the ninth resistor in parallel, the sixty-two resistor is connected with the sixty-three resistor in parallel, one end of the eighth resistor and one end of the ninth resistor are connected with one end of the sixty-two resistor, the other end of the eighth resistor is connected with the output of the push-pull circuit, and the other end of the sixty-two resistor is used for being connected with the G pole of the switching tube.
Further, the circuit also comprises a protection circuit, wherein the protection circuit comprises a sampling circuit, a NOT gate circuit and an optical coupling isolation circuit which are connected in sequence,
the sampling circuit comprises a fourth resistor, a fifth resistor, a thirteenth resistor, an eleventh resistor, a second capacitor, a third resistor, a tenth resistor and a first capacitor, a parallel branch consisting of the fourth resistor and the fifth resistor, a parallel branch consisting of the thirteenth resistor and the eleventh resistor and a parallel branch consisting of the thirteenth resistor and the eleventh resistor are sequentially connected with the second capacitor, a series branch consisting of the first capacitor and the tenth resistor and the third resistor are both connected with the second capacitor in parallel,
two ends of a parallel branch consisting of the fourth resistor and the fifth resistor are respectively used for being connected with an E pole and a C pole of a switching tube, a connecting point of the first capacitor and the tenth resistor is connected with an input end of the NOT gate circuit,
and the output end of the optical coupling isolation circuit is used for being connected with a control circuit.
Further, the optical coupling isolation circuit is connected with the control circuit through a feedback signal interface circuit, the feedback signal interface circuit comprises a shaping circuit I and a level conversion circuit I which are connected in sequence,
the input of the shaping circuit I is connected with the optical coupling isolation circuit, and the output of the level conversion circuit I is used for being connected with the control circuit.
The invention also provides a refined reactive power compensation device, which comprises
The control circuit is used for controlling the power supply,
the pulse conditioning circuit is connected between the control circuit and the driving chip through the pulse conditioning circuit, the pulse conditioning circuit comprises a level switching circuit II, an AND gate circuit and a shaping circuit II which are sequentially connected,
the input end of the second level conversion circuit is connected with the control circuit,
one input end of the AND gate circuit is connected with the output end of the level switching circuit II, the other input end of the AND gate circuit is connected with a direct current power supply,
and the output of the second shaping circuit is connected with the driving chip.
And the signal acquisition circuit comprises a power grid current sampling circuit, a power grid voltage sampling circuit, a bus voltage sampling circuit, a compensation device output current sampling circuit and a load current sampling circuit which are all connected with the control circuit.
Furthermore, the grid current sampling circuit, the grid voltage sampling circuit, the bus voltage sampling circuit, the compensation device output current sampling circuit and the load current sampling circuit are all connected with the control circuit through an AD conversion chip.
The control circuit comprises a DSP control circuit and an FPGA control circuit which are connected in sequence, and the driving circuit and the signal acquisition circuit are connected with the FPGA control circuit.
Furthermore, the DSP control circuit comprises a first DSP control circuit and a second DSP control circuit which are redundant with each other, and the first DSP control circuit and the second DSP control circuit are both connected with the FPGA control circuit.
The working principle of the invention is as follows:
the reactive power compensation device comprises a control circuit, a driving circuit and a power circuit which are sequentially connected, wherein the power circuit is external, the power circuit is three-phase output, each phase comprises four switching tubes, the control circuit and the driving circuit are divided into three groups, each group comprises four-way output, and the four-way output respectively controls the four switching tubes of each phase of the power circuit, so that three-level output of the power circuit is realized, and fine compensation is performed on a three-phase power grid.
The invention has the beneficial effects that:
1. after the driving chip receives a control signal sent by the control circuit, the driving chip outputs driving current, and the driving current is amplified by the push-pull circuit and then is connected to the G pole of the switching tube through the driving resistor, so that the driving control of the switching tube is realized. And calculating corresponding control signals according to the compensation requirement, and controlling the on and off of the switching tube to output corresponding compensation current.
The driving current ratio required by the switch tube is larger, and the push-pull circuit can amplify the driving current output by the driving chip so as to ensure the reliable conduction of the switch tube and further ensure that the reactive power compensation device can perform accurate compensation as required.
2. According to the invention, the input end of the driving chip is connected with the control circuit, the other end of the driving chip is connected with the switch tube through the push-pull circuit, and the isolation power supply provides an isolated power supply for the driving chip and the push-pull circuit, so that an interference signal at the side of the switch tube is prevented from entering the control circuit, and the reliable work of the control circuit is ensured.
3. The driving resistor adopts a series-parallel connection mode of the eighth resistor, the ninth resistor, the sixty-second resistor and the sixty-third resistor, so that the current bearing capacity can be increased, the heating value is reduced, the reliability of the driving resistor is improved, and the service life of the driving resistor is prolonged.
4. When the switch tube works normally, the voltage drop at two ends of the switch tube C, E is very small, the voltage at two ends of C1 in the sampling circuit is very small, one end of C1 is input into the NOT gate circuit, and the NOT gate circuit outputs high level.
When the switch tube is in overcurrent or short circuit, the voltage drop at two ends of the switch tube C, E is increased, the voltage at two ends of the C1 in the sampling circuit is increased, one end of the C1 is input into the NOT gate circuit, when the voltage of the C1 is larger than a set value, the output of the NOT gate circuit is at a low level, the low level signal is a fault signal, the fault signal is transmitted to the control circuit through the optical coupling isolation circuit, and after the control circuit detects the fault signal, the switch tube is controlled to be turned off, so that the circuit components are prevented from being damaged.
5. In the invention, a shaping circuit I consists of a Schmitt trigger, and a fault signal output by an optical coupling isolation circuit is filtered by the shaping circuit I to remove a jitter signal therein, so that false alarm caused by the jitter signal is prevented; the level conversion circuit comprises a two-level conversion chip, performs two-level conversion, converts the level of the fault signal into a signal which can be identified by the control circuit, and ensures that the control circuit can timely and accurately receive the fault signal.
6. The invention also provides a switch tube driving circuit and a refined reactive power compensation device, wherein the control circuit is used for outputting a control signal to the driving chip, receiving a fault signal fed back by the driving circuit and making a response in time, so that the whole reactive power compensation device is ensured to operate without faults.
The pulse conditioning circuit is divided into three groups, each group comprises four paths, and the four paths of output of the pulse conditioning circuit respectively correspond to four paths of output of the control circuit, wherein the level conversion circuit II is used for converting the level of the control signal from 3.3V to 15V so as to reach the level which can be identified by the driving chip; the AND gate circuit is used for improving the edge speed of the signal and reducing the edge time of the rising or falling of the signal; and the second shaping circuit comprises a two-stage Schmitt trigger and is used for filtering out jitter signals and ensuring that the driving chip receives accurate control signals.
7. The invention relates to a compensating device, which comprises a power grid current sampling circuit, a power grid voltage sampling circuit, a bus voltage sampling circuit, a load current sampling circuit, a control circuit and a compensating device, wherein the power grid current sampling circuit is used for sampling a power grid current signal, the power grid voltage sampling circuit is used for sampling a power grid current signal, the bus voltage sampling circuit is used for sampling a bus voltage signal, the load current sampling circuit is used for sampling current at a load side, the control circuit calculates current to be compensated according to the sampling values to control the compensating device to output corresponding current, and the compensating device outputs the current sampling circuit to sample the compensating current of the compensating device to realize feedback control of the compensating device.
8. The AD conversion chip converts the analog signal output by the signal acquisition circuit into a digital signal and then outputs the digital signal to the control circuit, so that the control circuit can read conveniently.
9. The control circuit adopts a form of combining a DSP control circuit and an FPGA control circuit, the FPGA control circuit is responsible for reading information fed back by a drive circuit and a signal acquisition circuit and sending data needing to be operated to the DSP control circuit for calculation, the DSP control circuit sends a calculation result to the FPGA control circuit, and the FPGA sends a control instruction according to the calculation result and the information fed back by the drive circuit. The invention fully utilizes the advantages of strong DSP computing capability and high FPGA running speed, and is beneficial to improving the control speed and precision.
10. The first DSP control circuit and the second DSP control circuit are mutually redundant, when one circuit fails, the other circuit is switched in rapidly, and the reliability of the invention is improved.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic block diagram of a driving circuit of the present invention;
FIG. 2 is a schematic diagram of a driving circuit of the present invention;
FIG. 3 is a schematic diagram of an isolated power supply circuit of the present invention;
FIG. 4 is a schematic diagram of a feedback signal interface circuit of the present invention;
FIG. 5 is a schematic block diagram of the reactive power compensation device circuit of the present invention;
FIG. 6 is a schematic diagram of a pulse conditioning circuit of the present invention;
FIG. 7 is a schematic diagram of a grid current sampling circuit of the present invention;
FIG. 8 is a schematic diagram of a grid voltage sampling circuit of the present invention;
FIG. 9 is a schematic diagram of a bus voltage sampling circuit of the present invention;
FIG. 10 is a schematic diagram of a compensation device output current sampling circuit of the present invention;
FIG. 11 is a schematic diagram of a load current sampling circuit of the present invention;
FIG. 12 is a schematic circuit diagram of an AD conversion chip according to the present invention;
FIG. 13 is a schematic diagram of the FPGA control circuit of the present invention;
FIG. 14 is a schematic diagram of a DSP control circuit according to the present invention;
FIG. 15 is a schematic diagram of a second DSP control circuit according to the present invention;
in the figure: the device comprises a control circuit 1, a control circuit 101, a DSP control circuit 1011, a DSP control circuit I, a DSP control circuit 1012, a FPGA control circuit 102, a drive circuit 2, a drive chip 21, a push-pull circuit 22, a drive resistor 23, an isolation power supply 24, a protection circuit 25, a sampling circuit 251, a NOT gate circuit 252, an optical coupling isolation circuit 253, a feedback signal interface circuit 254, a shaping circuit 2541, a level conversion circuit 2542, a pulse conditioning circuit 3, a level conversion circuit 31, an AND gate circuit 32, a shaping circuit 33, a signal acquisition circuit 4, a grid current sampling circuit 41, a grid voltage sampling circuit 42, a bus voltage sampling circuit 43, a compensation device output current sampling circuit 44, a load current sampling circuit 45, an AD conversion chip 5, a power circuit 6 and a switch tube 61.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The switching tube driving circuits are twelve paths with the same structure, and are divided into three groups, which respectively correspond to three-phase outputs of the power circuit 6, wherein one path is as shown in fig. 2, and includes a driving chip 21, a push-pull circuit 22 and a driving resistor 23, which are connected in sequence, the driving chip 21 is used for being connected with the control circuit 1, and the driving resistor 23 is used for being connected with a G pole of the switching tube 61.
In the invention, after the driving chip 21 receives the control signal sent by the control circuit 1, the driving chip 21 outputs the driving current, and the driving current is amplified by the push-pull circuit 22 and then is connected to the G pole of the switching tube 61 by the driving resistor 23, thereby realizing the driving control of the switching tube 61. According to the compensation requirement, a corresponding control signal is calculated, the on and off of the switch tube 61 is controlled, and then the corresponding compensation current can be output.
The driving current ratio required by the switch tube 61 is relatively large, and the push-pull circuit 22 can amplify the driving current output by the driving chip 21, so as to ensure that the switch tube 61 is reliably conducted, and further ensure that the reactive power compensation device of the invention can perform accurate compensation as required.
Further, the power supply system also comprises an isolation power supply 24, wherein the isolation power supply 24 is three groups with the same structure, and respectively corresponds to the three-phase output of the power circuit 6, one group is shown in figure 3,
the driving chip 21 is an isolated driving chip, and both the driving chip 21 and the push-pull circuit 22 are connected to an isolated power supply 24.
In the invention, the input end of the driving chip 21 is connected with the control circuit 1, the other end of the driving chip is connected with the switch tube 61 through the push-pull circuit 22, and the isolation power supply 24 provides an isolated power supply for the driving chip 21 and the push-pull circuit 22, so that an interference signal at the side of the switch tube 61 is prevented from entering the control circuit 1, and the reliable work of the control circuit 1 is ensured.
Further, the driving resistor 23 includes an eighth resistor, a ninth resistor, a sixty-second resistor and a sixty-third resistor,
the eighth resistor is connected in parallel with the ninth resistor, the sixty-second resistor is connected in parallel with the sixty-third resistor, one ends of the eighth resistor and the ninth resistor are connected with one end of the sixty-second resistor, the other end of the eighth resistor is connected with the output of the push-pull circuit 22, and the other end of the sixty-second resistor is used for being connected with the G pole of the switching tube 61.
In the invention, the driving resistor 23 adopts a series-parallel connection form of the eighth resistor, the ninth resistor, the sixty-second resistor and the sixty-third resistor, so that the current bearing capacity can be increased, the heat productivity can be reduced, the reliability of the driving resistor 23 can be improved, and the service life of the driving resistor 23 can be prolonged.
Further, the protection circuit 25 is further included, the protection circuit 25 includes a sampling circuit 251, a not gate circuit 252 and an optical coupling isolation circuit 253 which are connected in sequence,
the sampling circuit 251 comprises a fourth resistor, a fifth resistor, a thirteenth resistor, an eleventh resistor, a second capacitor, a third resistor, a tenth resistor and a first capacitor, a parallel branch consisting of the fourth resistor and the fifth resistor, a parallel branch consisting of the thirteenth resistor and the eleventh resistor and a second capacitor are sequentially connected, a series branch consisting of the first capacitor and the tenth resistor and the third resistor are both connected in parallel with the second capacitor,
two ends of a parallel branch consisting of a fourth resistor and a fifth resistor are respectively used for being connected with the E pole and the C pole of the switch tube 61, the connection point of the first capacitor and the tenth resistor is connected with the input end of the NAND gate circuit 252,
the output end of the optical coupling isolation circuit 253 is used for being connected with the control circuit 1.
The type of the driver chip 21 is PC929, and a not gate circuit 252 is disposed between the eighth pin and the ninth pin of the PC 929.
When the switch tube 61 works normally, the voltage drop across the switch tube 61C, E is very small, about 2V, the voltage across C1 in the sampling circuit 251 is very small, one end of C1 is input to the not-gate circuit 252, and the not-gate circuit 252 outputs a high level.
When the switch tube 61 is in overcurrent or short circuit, the voltage drop at two ends of the switch tube 61C, E is increased, the voltage at two ends of the C1 in the sampling circuit 251 is increased, one end of the C1 is input into the not gate circuit 252, when the voltage of the C1 is greater than a set value, the output of the not gate circuit 252 is in a low level, the low level signal is a fault signal, the fault signal is transmitted to the control circuit 1 through the optical coupling isolation circuit 253, and after the control circuit 1 detects the fault signal, the switch tube 61 is controlled to be turned off, so that the circuit components are prevented from being damaged.
Further, the optical coupling isolation circuit 253 is connected with the control circuit 1 through a feedback signal interface circuit 254, the feedback signal interface circuit 254 is twelve paths with the same structure, which are divided into three groups and respectively correspond to three groups of outputs of the power circuit 6, wherein six paths are shown in fig. 4, and include a shaping circuit one 2541 and a level conversion circuit one 2542 which are connected in sequence,
the input of the shaping circuit one 2541 is connected with the optical coupling isolation circuit 253, and the output of the level conversion circuit one 2542 is used for being connected with the control circuit 1.
In the invention, a first shaping circuit 2541 consists of a Schmitt trigger, and a fault signal output by an optical coupling isolation circuit 253 is filtered by the first shaping circuit 2541 to remove a jitter signal therein, so that false alarm caused by the jitter signal is prevented; the first level shift circuit 2542 includes a two-level shift chip, performs two-level shift, converts the level of the fault signal into a signal that can be recognized by the control circuit 1, and ensures that the control circuit 1 can timely and accurately receive the fault signal.
As shown in fig. 5-15, the present invention further provides a refined reactive power compensation device, which includes
The control circuit 1 is provided with a control circuit,
the pulse conditioning circuit 3, the control circuit 1 and the driving chip 21 are connected through the pulse conditioning circuit 3, the pulse conditioning circuit 3 is eleven paths with the same structure, which are divided into three groups and respectively correspond to three-phase outputs of the power circuit 6, wherein one path is shown in figure 6 and comprises a level conversion circuit II 31, an AND circuit 32 and a shaping circuit II 33 which are connected in sequence,
the input end of the second level shift circuit 31 is connected with the control circuit 1,
one input end of the and circuit 32 is connected with the output end of the second level shifter circuit 31, the other input end is connected with the direct current power supply,
the output of the second shaping circuit 33 is connected to the driver chip 21.
The invention also provides a switch tube driving circuit and a refined reactive power compensation device, wherein the control circuit 1 is used for outputting a control signal to the driving chip 21, receiving a fault signal fed back by the driving circuit 2 and making a response in time, so that the whole reactive power compensation device is ensured to operate without faults.
The pulse conditioning circuit 3 is divided into three groups, each group is four, and the four groups of pulse conditioning circuits respectively correspond to four paths of output of the control circuit 1, wherein the level conversion circuit II 31 is used for converting the level of the control signal from 3.3V to 15V to reach the level which can be identified by the driving chip 21; the and circuit 32 is used for increasing the edge speed of the signal and reducing the rising or falling edge time of the signal; the second shaping circuit 33 includes two stages of schmitt triggers for filtering out the jitter signal and ensuring that the driver chip 21 receives an accurate control signal.
Further, the device also comprises a signal acquisition circuit 4, wherein the signal acquisition circuit 4 comprises a power grid current sampling circuit 41, a power grid voltage sampling circuit 42, a bus voltage sampling circuit 43, a compensation device output current sampling circuit 44 and a load current sampling circuit 45 which are all connected with the control circuit 1.
According to the invention, a power grid current sampling circuit 41 is used for sampling a power grid current signal, a power grid voltage sampling circuit 42 is used for sampling a power grid current signal, a bus voltage sampling circuit 43 is used for sampling a bus voltage signal, a load current sampling circuit 45 is used for sampling current at a load side, a control circuit 1 calculates current to be compensated according to the sampling values to control the compensation device to output corresponding current, and a compensation device output current sampling circuit 44 is used for sampling compensation current of the compensation device to realize feedback control of the compensation device.
Further, the grid current sampling circuit 41, the grid voltage sampling circuit 42, the bus voltage sampling circuit 43, the compensation device output current sampling circuit 44, and the load current sampling circuit 45 are all connected to the control circuit 1 through the AD conversion chip 5. The AD conversion chips 5 are three groups having the same structure, and respectively correspond to the outputs of the signal acquisition circuit 4, where one group is shown in fig. 12.
According to the invention, the AD conversion chip 5 converts the analog signal output by the signal acquisition circuit 4 into a digital signal, and then outputs the digital signal to the control circuit 1, so that the control circuit 1 can read conveniently.
Further, the control circuit 1 comprises a DSP control circuit 101 and an FPGA control circuit 102 which are connected in sequence, and the driving circuit 2 and the signal acquisition circuit 4 are both connected to the FPGA control circuit 102.
The control circuit 1 of the invention adopts a form of combining the DSP control circuit 101 and the FPGA control circuit 102, the FPGA control circuit 102 is responsible for reading information fed back by the drive circuit 2 and the signal acquisition circuit 4 and sending data required to be operated to the DSP control circuit 101 for calculation, the DSP control circuit 101 sends a calculation result to the FPGA control circuit 102, and the FPGA issues a control instruction according to the calculation result and the information fed back by the drive circuit 2. The invention fully utilizes the advantages of strong DSP computing capability and high FPGA running speed, and is beneficial to improving the control speed and precision.
Further, the DSP control circuit 101 includes a first DSP control circuit 1011 and a second DSP control circuit 1012 which are redundant to each other, and both the first DSP control circuit 1011 and the second DSP control circuit 1012 are connected to the FPGA control circuit 102.
In the invention, the first DSP control circuit 1011 and the second DSP control circuit 1012 are mutually redundant, when one circuit fails, the other circuit is switched in quickly, and the reliability of the invention is improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A switching tube driving circuit is characterized by comprising a driving chip (21), a push-pull circuit (22) and a driving resistor (23) which are sequentially connected, wherein the driving chip (21) is used for being connected with a control circuit (1), the driving resistor (23) is used for being connected with a G pole of a switching tube (61),
the driving resistor (23) comprises an eighth resistor, a ninth resistor, a sixty-second resistor and a sixty-third resistor,
the eighth resistor is connected with the ninth resistor in parallel, the sixty-second resistor is connected with the sixty-third resistor in parallel, one end of the eighth resistor is connected with one end of the sixty-second resistor, the other end of the eighth resistor is connected with the output of the push-pull circuit (22), and the other end of the sixty-second resistor is used for being connected with the G pole of a switching tube (61),
the circuit further comprises a protection circuit (25), wherein the protection circuit (25) comprises a sampling circuit (251), a NOT gate circuit (252) and an optical coupling isolation circuit (253) which are sequentially connected,
the sampling circuit (251) comprises a fourth resistor, a fifth resistor, a thirteenth resistor, an eleventh resistor, a second capacitor, a third resistor, a tenth resistor and a first capacitor, a parallel branch consisting of the fourth resistor and the fifth resistor, a parallel branch consisting of the thirteenth resistor and the eleventh resistor and a parallel branch consisting of the thirteenth resistor and the eleventh resistor are sequentially connected with the second capacitor, a series branch consisting of the first capacitor and the tenth resistor and the third resistor are both connected with the second capacitor in parallel,
the two ends of a parallel branch composed of the fourth resistor and the fifth resistor are respectively used for being connected with an E pole and a C pole of a switch tube (61), the connection point of the first capacitor and the tenth resistor is connected with the input end of a NOT gate circuit (252), the output end of the NOT gate circuit (252) is connected to the input end of an optical coupling isolation circuit (253), and the output end of the optical coupling isolation circuit (253) is used for being connected with a control circuit (1).
2. The switching tube driving circuit according to claim 1, further comprising an isolation power supply (24), wherein the driving chip (21) is an isolated driving chip, and both the driving chip (21) and the push-pull circuit (22) are connected to the isolation power supply (24).
3. The switch tube driving circuit according to claim 1, wherein the optical coupling isolation circuit (253) is connected with the control circuit (1) through a feedback signal interface circuit (254), the feedback signal interface circuit (254) comprises a first shaping circuit (2541) and a first level conversion circuit (2542) which are connected in sequence,
the input of the shaping circuit I (2541) is connected with the optical coupling isolation circuit (253), and the output of the level conversion circuit I (2542) is used for being connected with the control circuit (1).
4. A refined reactive power compensator comprising a switching tube driver circuit as claimed in any one of claims 1~3, further comprising
The control circuit (1) is provided,
the control circuit (1) is connected with the driving chip (21) through the pulse conditioning circuit (3), the pulse conditioning circuit (3) comprises a level conversion circuit II (31), an AND gate circuit (32) and a shaping circuit II (33) which are sequentially connected,
the input end of the second level conversion circuit (31) is connected with the control circuit (1),
one input end of the AND gate circuit (32) is connected with the output end of the level switching circuit II (31), the other input end is connected with a direct current power supply,
and the output of the second shaping circuit (33) is connected with the driving chip (21).
5. A refined reactive power compensation device according to claim 4, further comprising a signal acquisition circuit (4), said signal acquisition circuit (4) comprising a grid current sampling circuit (41), a grid voltage sampling circuit (42), a bus voltage sampling circuit (43), a compensation device output current sampling circuit (44) and a load current sampling circuit (45), all connected to said control circuit (1).
6. A refined reactive power compensator according to claim 5, characterized in that the grid current sampling circuit (41), the grid voltage sampling circuit (42), the bus voltage sampling circuit (43), the compensator output current sampling circuit (44) and the load current sampling circuit (45) are all connected to the control circuit (1) through an AD conversion chip (5).
7. A refined reactive power compensation device according to claim 5, characterized in that said control circuit (1) comprises a DSP control circuit (101) and an FPGA control circuit (102) connected in sequence, and said driving circuit (2) and said signal acquisition circuit (4) are both connected to said FPGA control circuit (102).
8. A refined reactive power compensation device according to claim 7, wherein said DSP control circuit (101) comprises a first DSP control circuit (1011) and a second DSP control circuit (1012) that are redundant to each other, and said first DSP control circuit (1011) and said second DSP control circuit (1012) are both connected to said FPGA control circuit (102).
CN201911310909.6A 2019-12-18 2019-12-18 Switch tube driving circuit and refined reactive power compensation device Active CN112994418B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911310909.6A CN112994418B (en) 2019-12-18 2019-12-18 Switch tube driving circuit and refined reactive power compensation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911310909.6A CN112994418B (en) 2019-12-18 2019-12-18 Switch tube driving circuit and refined reactive power compensation device

Publications (2)

Publication Number Publication Date
CN112994418A CN112994418A (en) 2021-06-18
CN112994418B true CN112994418B (en) 2022-12-23

Family

ID=76343944

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911310909.6A Active CN112994418B (en) 2019-12-18 2019-12-18 Switch tube driving circuit and refined reactive power compensation device

Country Status (1)

Country Link
CN (1) CN112994418B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204119014U (en) * 2014-11-03 2015-01-21 哈尔滨同为电气股份有限公司 A kind of IGBT for three level drives and protective circuit
CN106411297B (en) * 2015-07-29 2019-07-12 国网智能电网研究院 A kind of high temperature driven protection circuit based on silicon-on-insulator chip
CN206619909U (en) * 2017-02-09 2017-11-07 中国石油化工股份有限公司 A kind of oil pumper dynamic reactive compensation device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
一种电流馈电交错正激的两级式DC/DC变换器;黄超 等;《电器与能效管理技术》;20181031(第20期);第82-85、92页 *

Also Published As

Publication number Publication date
CN112994418A (en) 2021-06-18

Similar Documents

Publication Publication Date Title
CN204465376U (en) Inverter and alternating current voltage sampling circuit thereof
CN201623651U (en) Single-stage three-phase solar photovoltaic grid-connected inverter
CN102055364B (en) Operation of three level converter
CN103280952A (en) Control system for modular multilevel converter and application method of control system
CN104965136A (en) Three-level converter power unit double pulse test method
CN103457283A (en) Super capacitor dynamic voltage recovery system and power supply system
CN105281361B (en) A kind of five-level double step-down combining inverter
CN202084939U (en) Intelligent comprehensive electric power compensation device
CN103219912B (en) Control method suitable for universal input voltage buck-boost grid-connected inverter
CN103312153B (en) A kind of parallel multi input coupling inductance buck-boost converter
CN105406752A (en) Control system for I-type and T-type three-level bidirectional PWM (Pulse-Width Modulation) rectifiers
CN112994418B (en) Switch tube driving circuit and refined reactive power compensation device
CN101882863B (en) Unit bypass circuit of unit cascaded high-voltage frequency converter
CN104201726A (en) UPS (Uninterrupted Power Supply) power supply system and current converting method thereof
CN201345067Y (en) Full digital power regulating device
CN203434638U (en) Solar cell grid-connected power generation system
CN115764817A (en) Quick shutoff device supporting two-way photovoltaic module input and having monitoring function
CN205724989U (en) Charge-discharge control system is all pressed in super capacitor group energy storage
CN213990125U (en) Bidirectional overcurrent protection device of bidirectional DC/DC converter
CN104901303A (en) Bidirectional Cuk circuit-based voltage balancer
CN208110887U (en) A kind of power grid simulation system based on RT-LAB
CN203859692U (en) Power supply device and N line lack protection circuit thereof
CN202712849U (en) PV module parallel array
CN206389293U (en) A kind of Single-Phase Inverter Source
CN202586370U (en) Photovoltaic grid-connected inverter control system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: A Switch Driver Circuit and Refined Reactive Power Compensation Device

Effective date of registration: 20231031

Granted publication date: 20221223

Pledgee: Hebei Bank Co.,Ltd. Xinshi South Road Branch

Pledgor: HEBEI VAUBAN POWER TECHNOLOGY Co.,Ltd.

Registration number: Y2023110000456

PE01 Entry into force of the registration of the contract for pledge of patent right