CN113098060B - Intelligent controllable power switch for new energy grid connection - Google Patents
Intelligent controllable power switch for new energy grid connection Download PDFInfo
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- CN113098060B CN113098060B CN202110377091.0A CN202110377091A CN113098060B CN 113098060 B CN113098060 B CN 113098060B CN 202110377091 A CN202110377091 A CN 202110377091A CN 113098060 B CN113098060 B CN 113098060B
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—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
- H02M1/092—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 the control signals being transmitted optically
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention relates to an intelligent controllable power switch for new energy grid connection. The switch comprises a human-computer interface, an MCU, a PWM driving device, a converter, an LCL filter, a voltage sampling module, a current sampling module, a controllable switch auxiliary circuit and a controllable switch main circuit; the switch adopts a full-control power device IGBT module, and an auxiliary circuit is added to realize smooth switching between an isolated island state and a grid-connected state of the inverter, so that the reliability is improved, and the protection fixed value can be conveniently changed. The current value can be accurately obtained, and then overcurrent protection is realized. The invention belongs to a controllable type, only one control signal is needed, and the problems of dead time setting, control signal complementation and the like do not need to be considered.
Description
Technical Field
The invention relates to the field of renewable energy grid connection, and mainly realizes smooth switching of micro-grid connection and island operation states and rapid intelligent protection under the condition of grid faults.
Background
The micro-grid is a small power generation and distribution system formed by collecting a distributed power supply, an energy storage device, an energy conversion device and related load, monitoring and protection devices. The system can realize self control, protection and management, and can be operated in parallel with a public power grid (grid-connected mode) or independently (island mode).
At present, the IEEE standard and national standards for new energy grid connection at home and abroad both put increasingly stringent requirements on the electric energy quality of the micro-grid. Therefore, the microgrid should be as smooth as possible when switching between the island mode and the grid-connected mode so as to reduce voltage spikes, current spikes, oscillations and the like during the switching process. In addition, the micro-grid belongs to a weak grid, and often occurs grid voltage/frequency fluctuation, grid impedance change, harmonic aggravation and other bad phenomena, which easily cause overvoltage and overcurrent, even instability/runaway of the power converter. Therefore, in the event of a grid fault, a quick disconnection from the fault source grid is critical to the protection of the power converter.
The traditional mechanical switch has long action time, most of the traditional mechanical switches are uncontrollable, and are not suitable for the requirements of new energy grid connection, such as an air switch, the on-time is about 20ms, and the off-time is about 100ms, but the traditional mechanical switch cannot be remotely and automatically controlled. The contactor can be remotely controlled, but is not easy to automatically control, the action time is generally dozens to hundreds of milliseconds, but noise exists, the contactor does not play a protection role in fault, and the protection fixed value of the air switch is not easy to adjust. While a Solid State Circuit Breaker (SSCB) based on a fully-controlled power switch device is a novel controllable contactless switch, and has the advantages of fast action, high reliability and small loss, and is more and more favored. Usually, the SSCB can implement overcurrent protection by using a desaturation detection method, but the method not only requires multiple experiments, but also repeatedly tests to obtain a reliable protection threshold, and the debugging period is long; but also is easily influenced by factors such as working environment, temperature, device aging and the like, and has low reliability. Therefore, the intelligent controllable power switch with high reliability, rapid protection and low debugging cost becomes a new favorite in the field of new energy grid-connected application.
OBJECT OF THE INVENTION
The invention aims to provide an intelligent controllable power switch for new energy grid connection, aiming at the defects in the prior art. The switch adopts a full-control power device IGBT module, and an auxiliary circuit is added to realize smooth switching between an isolated island state and a grid-connected state of the inverter, so that the reliability is improved, and the protection fixed value can be conveniently changed. On one hand, the invention is used for realizing smooth switching between the isolated island and the grid-connected state of the inverter; on the other hand, the connection with the power grid needs to be automatically and quickly cut off according to the fault state of the system, so that the bidirectional protection of the inverter and the power grid is realized, the system has the advantages of quick action, high reliability, low loss and the like, and the problems of high power and bidirectional on-off control are solved through the IGBT module.
The technical scheme of the invention is as follows:
an intelligent controllable power switch for new energy grid connection comprises a human-computer interface, an MCU, a PWM driving device, a converter, an LCL filter, a voltage sampling module, a current sampling module, a controllable switch auxiliary circuit and a controllable switch main circuit;
the connection relationship is as follows: the human-computer interface, the MCU, the PWM driving device, the converter and the LCL filter are sequentially connected in series; the input end of the voltage sampling module is connected with the current output end of the inductive current in the LCL filter, and the output end of the voltage sampling module is connected with the MCU; the input end of the current sampling module is connected with the voltage output end of the capacitor voltage in the LCL filter, and the output end of the current sampling module is connected with the MCU; two ends of the main circuit of the controllable switch are respectively connected with an auxiliary circuit, and the input end of a control signal (Drive) of the main circuit is connected with the MCU; one of the two auxiliary circuits is connected with the output end of the LCL filter in series, and the other auxiliary circuit is connected with the power grid in series;
the main circuit of the controllable switch comprises the following components: MCU respectively and resistance RS 1 And a resistor RS 2 Is connected to one terminal of a resistor RS 1 The other end of the resistor is connected with an ANODE pin of the first photoelectric coupler, and a resistor RS 2 The other end of the second optical coupler is connected with an ANODE pin of the second optical coupler; the CATHODE pins of the two photoelectric couplers are grounded, the VEE pin of the photoelectric coupler is connected with a-15V power supply, and the VCC pin is connected with a +15V power supply; IGBT module VT 1 The 5 port of the first photoelectric coupler is connected with the reference ground of the power supply of the first photoelectric coupler; IGBT module VT 1 The 7 port of the second photoelectric coupler is connected with the reference ground of the power supply of the second photoelectric coupler; OUTPUT pin of first photoelectric coupler is connected with IGBT module VT 1 The OUTPUT pin of the second photoelectric coupler is connected with the IGBT module VT 2 6 ports of (2); the 3 port of the IGBT module is connected with the cathode of the diode D1, and the 2 port of the IGBT module is connected with the lower diode D 2 Anode of (2), diode D 1 And diode D 2 Is connected with the cathode;
the controllable switch auxiliary circuits are two, and each controllable switch auxiliary circuit consists of a voltage dependent resistor VDR, a capacitor C and a resistor R which are connected in parallel; one end of the first controllable switch auxiliary circuit and an upper diode D in the main controllable switch circuit 1 Anode (lower diode D) 2 Cathode of the second controllable switch auxiliary circuit, one end of the second controllable switch auxiliary circuit is connected with a port of an IGBT module in the controllable switch main circuit; of the first controllable switch auxiliary circuitOne end of the first controllable switch auxiliary circuit is connected with the other end of the first controllable switch auxiliary circuit and is grounded;
the first photoelectric coupler and the second photoelectric coupler are the same and are FOD3180SD; each photoelectric coupler is provided with a power supply, the power supply is a direct current power supply, and the voltage is 15V.
The IGBT module is formed by connecting two IGBTs in series.
The beneficial effects of the invention are as follows:
(1) The IGBT module is realized by adopting a common IGBT module on the market, has high reliability, is easy to realize and is convenient for engineering batch production.
(2) The device has high symmetry in terms of element parameters, circuit layout, electrical parameters and the like, and is particularly suitable for an alternating current power circuit.
(3) The power switch is controllable, only one control signal is provided, and the problems of dead time setting, control signal complementation and the like do not need to be considered; and the control signal is compatible with 3.3V CMOS and 5V TTL, and can be generated by any one of the commonly used microprocessors (such as DSP, FPGA, ARM and the like).
(4) Because bidirectional conduction is required to be realized in alternating current power, and the diode has unidirectional conduction, the invention avoids the direct connection problem caused by the simultaneous conduction of the upper bridge arm power tube and the lower bridge arm power tube of the IGBT power module through the design of the reverse parallel diode, and skillfully realizes the bidirectional conduction and bidirectional blocking functions of current. And the current protection does not adopt a method of desaturation detection, because the desaturation detection not only needs repeated tests to obtain a threshold value, but also is difficult to change the threshold value, and can shift along with the aging of components. And the current value can be accurately obtained by adopting the current sensor, so that overcurrent protection is realized.
Conventional mechanical switches, such as air switches, have an on time of about 20ms and an off time of about 100ms, but cannot be remotely controlled automatically. The contactor can be remotely controlled, but is not easy to be automatically controlled, the action time is generally dozens of milliseconds to hundreds of milliseconds, and noise exists. The on-time of the invention is about tens of microseconds, and the off-time is hundreds of microseconds, thus greatly shortening the action time.
In short-circuit current protection, a common solid-state circuit breaker needs to repeatedly test to obtain a reliable protection threshold value by adopting a desaturation detection method. The invention can adopt a mode of detecting the current by the current sensor and then controlling the current in real time in short-circuit current protection, replaces a desaturation detection method, realizes current detection by the current sensor, and has the advantages of flexibility, convenience and high reliability.
Drawings
Fig. 1 is a schematic block diagram of the overall structure of a controllable power switch.
Fig. 2 is a circuit diagram of a controllable power switch.
Fig. 3 is an enlarged circuit diagram of a novel point of the controllable power switch.
Fig. 4 shows experimental test results of the controllable power switch, wherein fig. 4a shows a forward turn-on characteristic, fig. 4b shows a forward turn-off characteristic, fig. 4c shows a reverse turn-on characteristic, and fig. 4d shows a reverse turn-off characteristic;
wherein, 1-human-computer interface; 2-MCU;3-PWM driving means; 4-a converter; 5-LCL filter; 6-a voltage sampling module; 7-a current sampling module; 8-a controllable switching aid circuit; 9-a controllable switch main circuit; 10-power grid.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
The intelligent controllable power switch provided by the invention can be controlled by any microcontroller (such as DSP, FPGA, ARM and the like) with 3.3V CMOS or 5V TTL digital control signal output capability. The circuit is divided into a main circuit and an auxiliary circuit according to the different functions to be realized, and the detailed description is provided below.
The invention relates to an overall structure of an intelligent controllable switch (a controllable switch for short) for new energy grid connection, which is shown in figures 1 and 2: the controllable switch comprises a human-computer interface 1, an MCU2, a PWM driving device 3, a converter 4, an LCL filter 5, a voltage sampling module 6, a current sampling module 7, a controllable switch auxiliary circuit 8 and a controllable switch main circuit 9;
the connection relationship is as follows: the human-computer interface 1, the MCU2, the PWM driving device 3, the converter 4 and the LCL filter 5 are sequentially connected in series; the input end of the voltage sampling module 6 is connected with the current output end of the inductive current in the LCL filter 5, and the output end is connected with the MCU2; the input end of the current sampling module 7 is connected with the voltage output end of the capacitor voltage in the LCL filter 5, and the output end is connected with the MCU2; two ends of a main circuit 9 of the controllable switch are respectively connected with an auxiliary circuit 8, and a control signal (Drive) input end of the main circuit is connected with the MCU2; one of the two auxiliary circuits 8 is connected in series with the output end of the LCL filter, and the other auxiliary circuit is connected in series with the power grid 10;
thus, the MCU2, the PWM driving device 3, the converter 4, the LCL filter 5 and the voltage sampling module 6 form a voltage closed loop during operation; the MCU2, the PWM driving device 3, the converter 4, the LCL filter 5 and the current sampling module 7 form a current closed loop. The action current of the controllable switch can automatically or manually control the on-off of the controllable switch according to the current magnitude in the actual circuit, so that the on-off of the new energy power generation device and the power grid is realized.
The human-machine interface 1 is a known technology, and the embodiment adopts a ControlDesk (a simulation platform based on a computer) of dsace corporation in germany.
The MCU2 is a known device, and the embodiment adopts a MicroLabBox of dSPACE Germany;
the voltage sampling module 6 is specifically LV25-P of Lyme (LEM), in actual use, a 47K omega/5W resistor is connected in series with the primary side of the module, a 200 omega patch resistor is connected in series with the secondary side of the module and grounded, and an operational amplifier is connected to the secondary side of the module, so that the operational amplifier can convert the measured voltage of 0-500V into a voltage signal of 0-5V (the rated peak value of the national power grid is 311V).
The current sampling module 7 is specifically LAX100-NP from Lyme (LEM). In practical use, a 51 omega patch resistor is connected in series with the secondary side of the module and grounded, and meanwhile, the secondary side is connected with a circuit with the amplification factor of 4:1, so that the operational amplifier circuit can convert the measured current of 0-100A into a voltage signal of 0-10V. Note: the current measurement range can be set accordingly depending on the magnitude of the inverter power class.
The main circuit 9 of the controllable power switch designed by the invention is connected in series in a power circuit and has bidirectional conduction and bidirectional blocking capabilities, so that the main circuit 9 is suitable for the application scenes of both alternating current micro-grid connection and direct current micro-grid. The partial circuit is the core of the controllable power switch and is realized by common IGBT power modules, power diodes, driving circuits, power circuits and the like on the market.
The connection relation is as follows: MCU respectively and resistance RS 1 Resistance RS 2 Is connected (i.e. gives the Drive signal (Drive)), a resistor RS 1 The other end of the first switch is connected with a2 pin (ANODE pin) of the first photoelectric coupler, and a resistor RS 2 The other end of the second optical coupler is connected with a2 pin (ANODE pin) of the second optical coupler; the CATHODE pins of the two photoelectric couplers are grounded, the VEE pins of the photoelectric couplers are connected with a-15V power supply, and the VCC pins are connected with a +15V power supply; IGBT module VT 1 The 5 port of the first photoelectric coupler is connected with the reference ground of the power supply of the first photoelectric coupler; IGBT module VT 1 The 7 port of the second photoelectric coupler is connected with the reference ground of the power supply of the second photoelectric coupler; the first photocoupler is connected with an IGBT module VT through pins 6 and 7 (namely, an OUTPUT pin 6, a pin 7 and a pin 6 serve as the same OUTPUT end, and the pins 6 and 7 are connected together externally) 1 And the 6 and 7 pins (i.e. OUTPUT pins 6 and 7 are used as the same OUTPUT end, and 6 and 7 are connected together) of the second photoelectric coupler are connected with the IGBT module VT 2 6 ports of (2); the 3 port of the IGBT module is connected with the cathode of the diode D1, and the 2 port of the IGBT module is connected with the lower diode D 2 Anode of (2), diode D 1 Anode of (2) and diode D 2 The cathodes of the two electrodes are connected;
the first photoelectric coupler and the second photoelectric coupler are the same and are FOD3180SD; each photoelectric coupler is provided with a power supply, the power supply is a direct current power supply, and the voltage is 15V.
The IGBT module is formed by connecting two IGBTs in series. The IGBT module is adopted in the invention, so that the power grade is improved. And IGBT module heat dispersion is better.
The system comprises two controllable switch auxiliary circuits 8, and each controllable switch auxiliary circuit 8 is composed ofAll the three are connected in parallel with a piezoresistor VDR, a capacitor C and a resistor R; one end of the first controllable switch auxiliary circuit 8 and the upper diode D in the controllable switch main circuit 9 1 Anode (lower diode D) 2 Cathode of the second controllable switch auxiliary circuit 8) is connected with the port 1 of the IGBT module in the controllable switch main circuit 9; the other end of the first controllable switch auxiliary circuit 8 and the other end of the second controllable switch auxiliary circuit 8 are connected with each other and grounded;
the auxiliary circuit is a buffer circuit which is connected in parallel with two sides of a power switch in the power circuit, and the partial circuit is used for inhibiting overvoltage in the on-off process of the power switch so as to protect an IGBT power module and improve the reliability of the power switch. The partial circuit is formed by connecting a voltage dependent resistor VDR, a capacitor C and a resistor R in parallel.
The following is presented for the above designed research idea:
1 design of the Main Circuit
(1) Selection of power modules
The core of the power module selection lies in the determination of the rated voltage and rated current of the module. For the grid-connected inverter, the grid-connected voltage is 220V (Chinese national standard), and the rated voltage of the power module is 2-3 times on the basis of the allowance. Similarly, the rated current of the power module is also 2-3 times of the rated current of the grid-connected inverter. In this example, the power module is selected as FF150R12KE3G of England, inc., with a rated voltage of 1200V and a rated current of 150A.
(2) Selection of power diodes
The power diodes are connected in series in the power circuit, and the working current of the power diodes is the same as the grid-connected current of the inverter. Therefore, the rated current of the power diode is also 2-3 times of the rated current of the grid-connected inverter. In addition, the rated voltage of the power diode is selected to be 2-3 times of the voltage of the power grid because the power diode plays a role of reverse blocking in the circuit. The RHRG5060 is selected as the power diode in the design example, the reverse withstand voltage is 600V, and the average rectified current is 50A.
(3) Drive circuit design
The driving circuit is realized based on a common photoelectric coupler, has strong and weak electric isolation and power amplification effects, and effectively improves the reliability of the circuit. In the design example, the model of the photoelectric coupler is FOD3180SD.
(4) Power supply circuit design
The power circuit is ingenious in design that the reference ground of the upper and lower tube driving circuits of the IGBT power module is effectively separated through two independent power modules, and a conventional bootstrap circuit is omitted. The selection of the power module depends on the amplitude range of the control power and the power demand of the driving circuit. In the design example, the power supply module is WRA2415S-3WR2 of MORSUN (Jinsheng Yang), the input voltage range of the power supply module is 18-36V, and the output voltage of the power supply module is +/-15V.
2, an auxiliary circuit:
composition of controllable switch auxiliary circuit 8
The auxiliary circuit refers to a buffer circuit connected in parallel to both sides of the power switch in the power circuit, as indicated by the dashed box 8 in fig. 3. The partial circuit is used for inhibiting overvoltage in the on-off process of the power switch, so that the IGBT power module is protected, and the reliability of the power switch is improved. The partial circuit is formed by connecting a voltage dependent resistor VDR, a capacitor C and a resistor R in parallel.
(1) Voltage dependent resistor
The inductor in the power circuit and the parasitic inductor generated by the wiring can cause overvoltage when the power switch tube is turned off, which is not favorable for the long-term reliable operation of the IGBT power module and the power diode. Voltage dependent resistor VDR in auxiliary circuit 1 、VDR 2 The resistor is connected in the power circuit in parallel, and the resistance value is very large when the power circuit operates in a steady state, so that the circuit can be regarded as an open circuit; and when the power circuit generates overvoltage, the resistance value is suddenly reduced to absorb power, so that overvoltage protection of the IGBT power module and the power diode is realized.
(2) Capacitor with improved capacitance
Capacitor C 1 、C 2 And the circuit is also connected in parallel in the power circuit and is used for buffering overvoltage and energy generated by equivalent inductance in the power circuit, so that the IGBT power module and the power diode are protected.
(3) Resistance (RC)
Resistance R 1 ，R 2 Is present to give a capacitance C 1 、C 2 Providing respective discharge channels, the discharge time being determined by R x And C x (x =1,2) adjusted to specific discharge time requirements
The control signal of the controllable power switch is generated by the dSPACE MicroLabBox platform and transmitted to the control signal input port (the Drive end of the main circuit 9 in fig. 2) of the power switch through a digital output channel of the platform. The controllable power switch is connected in series in a power test circuit formed by connecting a 100V direct-current power supply and a load resistor of 50 omega in series. The test only takes the controllable switch auxiliary circuit 8 and the controllable switch main circuit 9 in fig. 2. The direction of current flow in fig. 2 is defined as positive direction from left to right and negative direction from right to left.
The test procedure was as follows:
1) Forward on/off test
In fig. 2, a 100V power supply is connected in series to the left side of the left auxiliary circuit 8, and a 50 Ω resistor is connected in series to the right side of the right auxiliary circuit 8.
And controlling the MicroLabBox by a program to enable Drive to be high level. At this time, the IGBT upper and lower bridge arm power tube VT 1 And VT 2 While conducting (see fig. 3). But due to the power diode D 2 The current flows from the in port through the power diode D 1 And upper bridge arm power tube VT 1 And finally out the out port.
And controlling the MicroLabBox by a program to enable Drive to be low level. At this time, the IGBT upper and lower bridge arm power tube VT 1 And VT 2 While being turned off (see fig. 3). An open circuit is formed between in and out in the test circuit, and no current flows through.
The voltage V at the two ends of the load resistor is obtained through experimental tests R (out port voltage), current i flowing through load resistor R And waveforms of the driving signal Drive are shown in fig. 4a and 4 b.
2) Reverse on/off test
In fig. 2, a 50 Ω resistor is connected in series to the left side of the left auxiliary circuit 8, and a 100V power supply is connected in series to the right side of the right auxiliary circuit 8.
Repeating the testing steps in 1). The voltage V at the two ends of the load resistor is obtained through experimental tests R (port voltage in), current i flowing through load resistance R And waveforms of the driving signal Drive are shown in fig. 4c and 4 d.
From fig. 4a it can be seen that when Drive is changed from 0V to 5V, the current in the circuit reaches 2A for the first time through about 16 mus, and reaches steady state through about 40 mus current value. From fig. 4b it can be seen that when Drive goes from 5V to 0V, the current in the circuit reaches steady state over about 400 mus.
It can be seen from fig. 4c that when Drive is changed from 0V to 5V, the current in the circuit reaches 2A for the first time through about 16 mus and reaches steady state through about 40 mus current value. It can be seen from fig. 4d that when Drive changes from 5V to 0V, the current in the circuit reaches steady state over about 400 mus.
It can also be seen from fig. 4 that the current waveforms are approximately the same for the forward and reverse cases, which is of great significance for reducing the bias in an ac circuit.
The experimental result shows that the power circuit can realize bidirectional conduction and bidirectional blocking, the on-off time is in the uS level, no obvious overvoltage and overcurrent phenomena exist, and the requirement of new energy grid connection is met.
The invention is not the best known technology.
Claims (2)
1. An intelligent controllable power switch for new energy grid connection is characterized in that the switch comprises a human-computer interface, an MCU, a PWM driving device, a converter, an LCL filter, a voltage sampling module, a current sampling module, a controllable switch auxiliary circuit and a controllable switch main circuit;
the connection relationship is as follows: the human-computer interface, the MCU, the PWM driving device, the converter and the LCL filter are sequentially connected in series; the input end of the current sampling module is connected with the current output end of the inductive current in the LCL filter, and the output end of the current sampling module is connected with the MCU; the input end of the voltage sampling module is connected with the voltage output end of the capacitor voltage in the LCL filter, and the output end of the voltage sampling module is connected with the MCU; two ends of the main circuit of the controllable switch are respectively connected with an auxiliary circuit, and the control signal input end of the main circuit is connected with the MCU; one of the two auxiliary circuits is connected with the output end of the LCL filter in series, and the other auxiliary circuit is connected with the power grid in series;
the main circuit of the controllable switch comprises the following components: MCU respectively and resistance RS 1 Resistance RS 2 Is connected to one terminal of a resistor RS 1 The other end of the resistor is connected with an ANODE pin of the first photoelectric coupler, and a resistor RS 2 The other end of the second optical coupler is connected with an ANODE pin of the second optical coupler; the CATHODE pins of the two photoelectric couplers are grounded, the VEE pin of the photoelectric coupler is connected with a-15V power supply, and the VCC pin is connected with a +15V power supply; IGBT module VT 1 The 5 port of the first photoelectric coupler is connected with the reference ground of the power supply of the first photoelectric coupler; IGBT module VT 2 The 7 port of the second photoelectric coupler is connected with the reference ground of the power supply of the second photoelectric coupler; OUTPUT pin of first photoelectric coupler is connected with IGBT module VT 1 The OUTPUT pin of the second photoelectric coupler is connected with the IGBT module VT 2 A gate of (2); IGBT module VT 1 Is connected to the cathode of the diode D1, and the IGBT module VT 2 Emitter-connected diode D 2 Anode of (2), diode D 1 Anode of (2) and diode D 2 Is connected with the cathode;
the controllable switch auxiliary circuits are two, and each controllable switch auxiliary circuit consists of a voltage dependent resistor VDR, a capacitor C and a resistor R which are connected in parallel; one end of the first controllable switch auxiliary circuit and the upper diode D in the controllable switch main circuit 1 The anode of the second controllable switch auxiliary circuit is connected with the port 1 of the IGBT module in the controllable switch main circuit; the other end of the first controllable switch auxiliary circuit and the other end of the second controllable switch auxiliary circuit are connected with each other and grounded.
2. The intelligent controllable power switch for the new energy grid connection according to claim 1, wherein the first photocoupler and the second photocoupler are the same; the IGBT module is formed by connecting two IGBTs in series.
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| CN104253447A (en) * | 2014-10-11 | 2014-12-31 | 国家电网公司 | Driving control system of intelligent isolation switch of micro power grid |
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| CN105098782A (en) * | 2014-12-24 | 2015-11-25 | 上海电气集团股份有限公司 | Intelligent micro-grid switching and protection device and system |
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