CN104022629A - Modular circuit suitable for multi-module series-parallel connection system - Google Patents
Modular circuit suitable for multi-module series-parallel connection system Download PDFInfo
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Abstract
The invention relates to a modular circuit suitable for a multi-module series-parallel connection system. The multi-module series-parallel connection system mainly comprises a cascading H bridge converter, a modular multi-level converter and a solid-state transformer. The modular circuit comprises a PCB integrating a main power circuit, a control circuit and a communication circuit. The main power circuit is a power electronic circuit topology which can be, but not limited to, a full H-bridge circuit, a half H-bridge circuit or a dual-active bridge converter; the control circuit comprises a digital signal processor, a sampling circuit, a driving circuit and a protective circuit; the communication circuit comprises an optical fiber transmitter, an optical fiber receiver and a relevant edge conditioning chip, and the communication circuit is connected with an upper layer controller through two communication optical fibers; the optical fiber transmitter assists the modular circuit in sending module information of the modular circuit to the upper layer controller; the optical fiber receiver assists the modular circuit in receiving an control command sent by the upper controller to the modular circuit; the modular circuit suitable for the multi-module series-parallel connection system has the advantages of being simple in whole structure, strong in anti-jamming capability and the like.
Description
Technical field
The present invention relates to a kind of modular circuit that is applicable to multimode series-parallel system, belong to technical field of power systems.
Background technology
In recent years, with full-controlled switch device (as gate level turn-off thyristor GTO, insulated gate bipolar transistor IGBT etc.), for basic electric power network technique of new generation, obtained continuous development.Meanwhile modern society sharply increases the demand of electric power, and the scale of electric power system is also in continuous growth.And full-control type device is to be made by the semi-conducting material of the special impurities of having adulterated, its maximum can withstand voltage and maximum can all have certain limitation by current flowing.In addition, all pressure of a plurality of full-controlled switch devices when series connection or parallel connection is an academic difficult problem with equal flow problem, do not have yet so far good solution.In order to solve the problem of full-control type device voltage and current class deficiency, adopt the solution of multimode series connection or parallel connection very general.Common such as the Cascade H bridging parallel operation (CHB) that is applied to Static Var Compensator (STATCOM), be applied to the modular multilevel converter (MMC) in flexible AC transmission (FACTS) and flexible DC power transmission (VSC-HVDC) field, and the very promising solid-state transformer (SST) that is applied to direct-flow distribution system.
The series-parallel design of multimode has been avoided the direct connection in series-parallel of switching device, has successfully solved the huge contradiction of difference between switching device power grade and grid power grade.And this modular system configuration is also for the design of redundancy fault-tolerant has brought convenience.But a large amount of module connection in series-parallel also makes the control framework of whole system become very complicated, the communication agency between whole system various piece also becomes very huge simultaneously.
For the problems referred to above, academia and industrial quarters have proposed a lot of solutions.What relatively merit attention is a bit the design philosophy of drawing integrated circuit, and power circuit, control circuit and telecommunication circuit are pressed to certain structure assembly in same PCB circuit board.This design, without designing separately control circuit and telecommunication circuit, has been simplified system configuration.And, by the control task of module level, sampling such as voltage, the processing of the faults such as over-voltage and over-current, or even the modulation of switching signal transfers to the control circuit of module self to complete, liberated system master device processed, made it be absorbed in system-level control task, as control of man-machine interaction, active power and reactive power etc.
Regrettably, these design great majority are still only paid close attention to modular circuit self, and communication agency between module and upper strata controller more complicated still.Relatively distinct issues are that telecommunication optical fiber used is more, and the potential of simple optical fiber being underutilized.For this problem, some scholars has proposed the multiplexing way of optical fibre time division, successfully with two optical fiber, has realized communicating by letter between individual module and upper strata controller.But these designs adopt the multiplex circuit of custom-designed complexity to integrate unlike signal, have increased the design difficulty of module.In addition, multimode series-parallel system is generally used in the occasion of high-power, and operational environment electromagnetic interference is serious, thereby this multiplex circuit is easily interfered to go wrong, even can not work, and is therefore also unfavorable for the lifting of system reliability.
Summary of the invention
The object of the invention is to for the technical problem such as the complex structure existing in prior art, reliability be lower, and a kind of modular circuit that is applicable to multimode series-parallel system has been proposed, it take a powerful digital signal processor is core control circuit, by digital signal processor, carry out conditioning and the integration of various signals, thereby simplify the design of module self, simplified the design of communication agency between module and upper strata controller, antijamming capability is stronger, and reliability is higher.
The object of the invention is to complete by following technical solution, described multimode series-parallel system mainly comprises Cascade H bridging parallel operation, modular multilevel converter and solid-state transformer; Described modular circuit comprises a PCB circuit board that is integrated with main power circuit, control circuit and telecommunication circuit;
Described main power circuit is but is not limited to a kind of Power Electronic Circuit topology in full H bridge circuit, half H bridge circuit or two active bridge converter;
Described control circuit comprises digital signal processor, sample circuit, drive circuit and a protective circuit; Described control circuit is realized electrical isolation by opto-coupler chip and voltage hall sensor and described main power circuit;
Described telecommunication circuit comprises a fiber optic transmitter, a fiber optic receiver and relevant edge conditioning chip, and this telecommunication circuit is connected with upper strata controller by two telecommunication optical fibers; Wherein said fiber optic transmitter sends " module information " for modular circuit to upper strata controller; Described fiber optic receiver receives upper strata controller for modular circuit and sends " control command " to modular circuit.
The value of " module information " of the present invention comprises voltage and the operating state of module, and described digital signal processor is integrated into two frame 8 position digital signals by the voltage of described module and operating state, and adopts serial communication interface to send to upper strata controller;
Two described frame 8 position digital signals are defined as:
Low four of the first frame of digital signal is module status information, and the Gao Siwei of the first frame of digital signal is low four information of voltage, and the second frame of digital signal is voltage high eight-bit information;
Described module status information is defined as:
B0001 representation module sends coomand mode in waiting for upper strata controller; B0010 representation module is in normal operating conditions; B1011 representation module is in stopped status; B1101 representation module is in overcurrent protection state; B1100 representation module is in overvoltage protection state; B1111 and B1110 represent that main power circuit has switching tube that fault has occurred.
" control command " of the present invention comprises driving pulse, halt instruction and wakes instruction up; Described digital signal processor is differentiated described " control command ";
Described driving pulse refers to that upper strata controller is sent to module controller for controlling the closed order with disconnecting of main power circuit switching tube; Described driving pulse is one group of continuous impulse, by described digital signal processor, generates the multipair continuous impulse that has each other certain phase difference, and every a pair of continuous impulse comprises two each other with the complementary pulse of Dead Time;
Described halt instruction is one group " high-frequency impulse "; Described high-frequency impulse frequency is far above driving pulse; Described digital signal processor is determined halt instruction by the high-frequency impulse hopping edge of judgement some, blocks described drive circuit;
The described effect that wakes instruction up is to make the module in stopped status come back to normal operating conditions; The described instruction that wakes up is one group " low-frequency pulse ", and described low-frequency pulse frequency is lower than switching pulse; Described digital signal processor is determined and is waken up instruction by the low-frequency pulse hopping edge of judgement some, removes the blockade to described drive circuit.
The present invention has the following advantages with respect to prior art tool:
1) to take a powerful digital signal processor be core to described control circuit, carries out conditioning and the integration of various signals by digital signal processor, simplified the design of module self.
2) described telecommunication circuit only comprises a pair of fiber optical transceiver, has simplified the design of communication agency between module and upper strata controller.
3) described module is not used complicated signal multiplexing modulate circuit, and design style is brief, and has carried out electrical isolation between control circuit and main power circuit, and antijamming capability is stronger, and reliability is higher.
Accompanying drawing explanation
Fig. 1 is the basic boom of modular circuit of the present invention and the information flow between circuit unit.
Fig. 2 is that modular circuit of the present invention transmits the formal definition of " module information " to upper strata controller.
Fig. 3 is the working timing figure of modular circuit response upper strata controller of the present invention " control command ".
Fig. 4 is the main program flow chart of the digital signal processor of modular circuit of the present invention.
Fig. 5 is the enhancing capturing unit interrupt routine flow chart of the digital signal processor of modular circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing and instantiation, the invention will be further described.Shown in accompanying drawing, a kind of modular circuit that is applicable to multimode series-parallel system of the present invention, described multimode series-parallel system mainly comprises Cascade H bridging parallel operation CHB, modular multilevel converter MMC and solid-state transformer SST; Described modular circuit comprises a PCB circuit board that is integrated with main power circuit, control circuit and telecommunication circuit;
Described main power circuit is but is not limited to a kind of Power Electronic Circuit topology in full H bridge circuit, half H bridge circuit or two active bridge converter DAB;
Described control circuit comprises digital signal processor DSP, sample circuit, drive circuit and a protective circuit; Described control circuit is realized electrical isolation by opto-coupler chip and voltage hall sensor and described main power circuit;
Described telecommunication circuit comprises a fiber optic transmitter, a fiber optic receiver and relevant edge conditioning chip, and this telecommunication circuit is connected with upper strata controller by two telecommunication optical fibers; Wherein said fiber optic transmitter sends " module information " for modular circuit to upper strata controller; Described fiber optic receiver receives upper strata controller for modular circuit and sends " control command " to modular circuit.
The value of " module information " of the present invention comprises voltage and the operating state of module, and described digital signal processor DSP is integrated into two frame 8 position digital signals by the voltage of described module and operating state, and adopts serial communication interface SCI to send to upper strata controller;
Two described frame 8 position digital signals are defined as:
Low four of the first frame of digital signal is module status information, and the Gao Siwei of the first frame of digital signal is low four information of voltage, and the second frame of digital signal is voltage high eight-bit information;
Described module status information is defined as:
B0001 representation module sends coomand mode (Waiting) in waiting for upper strata controller; B0010 representation module is in normal operating conditions (Working); B1011 representation module is in stopped status (Stop); B1101 representation module is in overcurrent protection state (OC); B1100 representation module is in overvoltage protection state (OV); B1111 and B1110 represent that main power circuit has switching tube that fault has occurred.
" control command " of the present invention comprises driving pulse, halt instruction and wakes instruction up; Described digital signal processor (DSP) is differentiated described " control command ";
Described driving pulse refers to that upper strata controller is sent to module controller for controlling the closed order with disconnecting of main power circuit switching tube; Described driving pulse is one group of continuous impulse, by described digital signal processor DSP, generates the multipair continuous impulse that has each other certain phase difference, and every a pair of continuous impulse comprises two each other with the complementary pulse of Dead Time;
Described halt instruction is one group " high-frequency impulse "; Described high-frequency impulse frequency is far above driving pulse; Described digital signal processor DSP is determined halt instruction by the high-frequency impulse hopping edge of judgement some, blocks described drive circuit;
The described effect that wakes instruction up is to make the module in stopped status come back to normal operating conditions; The described instruction that wakes up is one group " low-frequency pulse ", and described low-frequency pulse frequency is lower than switching pulse; Described digital signal processor DSP is determined and is waken up instruction by the low-frequency pulse hopping edge of judgement some, removes the blockade to described drive circuit.
Embodiment: the present invention is described by the following examples again, but the scope of application of the present invention is not limited to this example.
Shown in Fig. 1, the structure of modular circuit of the present invention comprises main power circuit, control circuit, telecommunication circuit.
Described main power circuit can be various Power Electronic Circuit topologys, and such as full H bridge circuit, half H bridge circuit, or even two initiatively bridge converters of relative complex, take the simplest half-bridge circuit as example; Full-controlled switch device adopts insulated gate bipolar transistor IGBT.
Described control circuit comprises a digital signal processor, sample circuit, drive circuit, protective circuit.Described control circuit is realized electrical isolation by opto-coupler chip and voltage hall sensor and main power circuit.The TMS320F28035 chip that digital signal processor adopts TI company to produce, this chip carries serial communication interface SCI and strengthens capturing unit eCAP.All functions of the presently claimed invention all can realize by programming on this chip, and Fig. 4 i.e. the main program flow chart of described digital signal processor.
Described telecommunication circuit comprises a fiber optic transmitter, a fiber optic receiver and relevant edge conditioning chip, by two telecommunication optical fibers, is connected with upper strata controller.Described fiber optic transmitter sends " module information " for modular circuit to upper strata controller.Described fiber optic receiver receives upper strata controller for modular circuit and sends " control command " to modular circuit.
Shown in Fig. 2, described " module information " content comprises voltage and the operating state of described module.Adopt digital signal processor that described module voltage and operating state are integrated, and adopt serial communication interface to send to upper strata controller.
Shown in Fig. 3, described " control command " comprises driving pulse, and halt instruction, wakes instruction up.Adopt the enhancing capturing unit eCAP of digital signal processor to differentiate described " control command ", the program circuit of described enhancing capturing unit eCAP interrupt routine as shown in Figure 5.
Described driving pulse refers to that upper strata controller is sent to module controller for controlling the closed order with disconnecting of main power circuit switching tube.Described driving pulse is one group of continuous impulse, by described digital signal processor, produces and a pair ofly comprises two each other with the complementary pulse of Dead Time, as shown in Figure 3.
Described halt instruction is one group " high-frequency impulse ".The frequency of described high-frequency impulse is decided to be to 750kHz.As shown in Figure 3, described digital signal processor is determined halt instruction by judging continuous four high-frequency impulse hopping edges, gives as mistake! Do not find Reference source.Shown protective circuit sends halt command, and protective circuit drives locking signal to block drive circuit to drive circuit transmission as shown in Figure 1.
The described instruction that wakes up makes the module in stopped status come back to normal operating conditions, is one group " low-frequency pulse ", and the described low-frequency pulse frequency of definition is 300Hz.Described digital signal processor DSP wakes instruction up by judging that the rising edge of continuous two low-frequency pulses is determined, cancels the halt command of issuing protective circuit as shown in Figure 1, and protective circuit is cancelled and issued as mistake! Do not find Reference source.The driving locking signal of shown drive circuit, removes the blockade to drive circuit.Now upper strata controller can't send driving pulse downwards immediately, only has when upper strata controller, to receive the normal operating conditions information from module feedback and just again send driving pulse downwards, as shown in Figure 3.
By above examples of implementation, can be found out, compared with prior art, the designed modular circuit of the present invention is simple in structure, and the integration of signal is by the digital signal processor realization of programming, without custom-designed complex structure and the low signal multiplexing modulate circuit of reliability.Module is only used two telecommunication optical fibers with communicating by letter of upper strata controller, has simplified the communication agency of multimode series-parallel system.
Claims (3)
1. be applicable to a modular circuit for multimode series-parallel system, described multimode series-parallel system mainly comprises Cascade H bridging parallel operation (CHB), modular multilevel converter (MMC) and solid-state transformer (SST); It is characterized in that described modular circuit comprises a PCB circuit board that is integrated with main power circuit, control circuit and telecommunication circuit;
Described main power circuit is but is not limited to a kind of Power Electronic Circuit topology in full H bridge circuit, half H bridge circuit or two active bridge converter (DAB);
Described control circuit comprises a digital signal processor (DSP), sample circuit, drive circuit and protective circuit; Described control circuit is realized electrical isolation by opto-coupler chip and voltage hall sensor and described main power circuit;
Described telecommunication circuit comprises a fiber optic transmitter, a fiber optic receiver and relevant edge conditioning chip, and this telecommunication circuit is connected with upper strata controller by two telecommunication optical fibers; Wherein said fiber optic transmitter sends " module information " for modular circuit to upper strata controller; Described fiber optic receiver receives upper strata controller for modular circuit and sends " control command " to modular circuit.
2. the modular circuit that is applicable to multimode series-parallel system according to claim 1, described in it is characterized in that, the value of " module information " comprises voltage and the operating state of module, described digital signal processor (DSP) is integrated into two frame 8 position digital signals by the voltage of described module and operating state, and adopts serial communication interface (SCI) to send to upper strata controller;
Two described frame 8 position digital signals are defined as:
Low four of the first frame of digital signal is module status information, and the Gao Siwei of the first frame of digital signal is low four information of voltage, and the second frame of digital signal is voltage high eight-bit information;
Described module status information is defined as:
B0001 representation module sends coomand mode (Waiting) in waiting for upper strata controller; B0010 representation module is in normal operating conditions (Working); B1011 representation module is in stopped status (Stop); B1101 representation module is in overcurrent protection state (OC); B1100 representation module is in overvoltage protection state (OV); B1111 and B1110 represent that main power circuit has switching tube that fault has occurred.
3. the modular circuit that is applicable to multimode series-parallel system according to claim 1, is characterized in that described " control command " comprises driving pulse, halt instruction and wake instruction up; Described digital signal processor (DSP) is differentiated described " control command ";
Described driving pulse refers to that upper strata controller is sent to module controller for controlling the closed order with disconnecting of main power circuit switching tube; Described driving pulse is one group of continuous impulse, by described digital signal processor (DSP), generate the multipair continuous impulse that has each other certain phase difference, and every a pair of continuous impulse comprises two each other with the complementary pulse of Dead Time;
Described halt instruction is one group " high-frequency impulse "; Described high-frequency impulse frequency is far above driving pulse; Described digital signal processor (DSP) is determined halt instruction by the high-frequency impulse hopping edge of judgement some, blocks described drive circuit;
The described effect that wakes instruction up is to make the module in stopped status come back to normal operating conditions; The described instruction that wakes up is one group " low-frequency pulse ", and described low-frequency pulse frequency is lower than switching pulse; Described digital signal processor (DSP) is determined and is waken up instruction by the low-frequency pulse hopping edge of judgement some, removes the blockade to described drive circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410196657.XA CN104022629A (en) | 2014-05-09 | 2014-05-09 | Modular circuit suitable for multi-module series-parallel connection system |
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| CN201410196657.XA CN104022629A (en) | 2014-05-09 | 2014-05-09 | Modular circuit suitable for multi-module series-parallel connection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| US11088610B2 (en) | 2019-08-14 | 2021-08-10 | Delta Electronics (Shanghai) Co., Ltd. | Driving and controlling method for switching element and circuit thereof |
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| CN201774458U (en) * | 2010-07-22 | 2011-03-23 | 荣信电力电子股份有限公司 | MMC (modular multilevel converter)-based transformerless four-quadrant topological structure of high-voltage variable frequency power source |
| CN102130612A (en) * | 2010-12-20 | 2011-07-20 | 中国电力科学研究院 | Integrated control sub-module board for simulating multi-level modular converter (MMC) sub-module |
| CN102148579A (en) * | 2010-12-20 | 2011-08-10 | 中国电力科学研究院 | Equitime constant reduced submodule plate simulating plurality of submodules of MMC (Multi-level Modular Converte) |
| CN103684014A (en) * | 2013-12-20 | 2014-03-26 | 浙江省电力设计院 | Method applicable to communication between sub-module controller and upper layer controller of modular multi-level converter |
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- 2014-05-09 CN CN201410196657.XA patent/CN104022629A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201774458U (en) * | 2010-07-22 | 2011-03-23 | 荣信电力电子股份有限公司 | MMC (modular multilevel converter)-based transformerless four-quadrant topological structure of high-voltage variable frequency power source |
| CN102130612A (en) * | 2010-12-20 | 2011-07-20 | 中国电力科学研究院 | Integrated control sub-module board for simulating multi-level modular converter (MMC) sub-module |
| CN102148579A (en) * | 2010-12-20 | 2011-08-10 | 中国电力科学研究院 | Equitime constant reduced submodule plate simulating plurality of submodules of MMC (Multi-level Modular Converte) |
| CN103684014A (en) * | 2013-12-20 | 2014-03-26 | 浙江省电力设计院 | Method applicable to communication between sub-module controller and upper layer controller of modular multi-level converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| US11088610B2 (en) | 2019-08-14 | 2021-08-10 | Delta Electronics (Shanghai) Co., Ltd. | Driving and controlling method for switching element and circuit thereof |
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Application publication date: 20140903 |