CN203858283U - Sub-module current direction judgment circuit of cascaded converter arm - Google Patents
Sub-module current direction judgment circuit of cascaded converter arm Download PDFInfo
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- CN203858283U CN203858283U CN201420217985.9U CN201420217985U CN203858283U CN 203858283 U CN203858283 U CN 203858283U CN 201420217985 U CN201420217985 U CN 201420217985U CN 203858283 U CN203858283 U CN 203858283U
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Abstract
The utility model belongs to the electric power electronic technical field and relates to a sub-module current direction judgment circuit of a cascaded converter arm. The sub-module current direction judgment circuit includes a data selector U11, a voltage comparator U12, a high-speed optocoupler U13, high-speed optocouplers form U14 to U16, a current sensor TA1, resistors from R10 to R19 and a double-pole-single-throw switch KD1. With the sub-module current direction judgment circuit of the utility model adopted, all the current sensors can be mounted on sub modules, and problems existing in insulation against ground and isolation power source supply of the sub modules can be solved, and the insulation level of the current sensors in the sub-module current direction judgment circuits of the utility model is only required to satisfy the rated voltage insulation of the sub modules, and therefore, cost and insulation complexity can be greatly reduced; a multi-current sensor cascaded structure is adopted, so that the sub-module current direction judgment circuit has a redundant property, and if a fault exists on the current sensor installed on a certain sub-module, the sub-module where the current sensor is arranged is only needed to be bypassed, and continuous work of the circuit will not be affected, and the reliability of the sub-module current direction judgment circuit is improved significantly compared with a circuit adopting a single sensor.
Description
Technical field
The utility model belongs to electric and electronic technical field, relates to a kind of submodule direction of current decision circuitry of cascade connection converter device brachium pontis.
Background technology
The development of Power Electronic Technique for building intelligence, clean, modern power systems provides powerful support efficiently, all obtained widely and applied in D.C. high voltage transmission (HVDC) and flexible AC transmission (FACTS) field.Modularization multi-level converter (Modular Multilevel Converter, MMC) and cascade as high-power current converter of new generation, there is transmission line capability large, meritorious idle can independently control, exchange output without complicated filter, reliability is high, can, to plurality of advantages such as passive or weak receiving-end system transmissions of electricity, be considered to the representative art of flexible DC power transmission.
Modularization multi-level converter is three phase full bridge structure, each brachium pontis of this three phase full bridge is in series by n submodule, wherein n is greater than 1 integer, the structure of each submodule is identical, each submodule comprises submodule main circuit and the by-pass switch in parallel with it, by-pass switch can ensure that transverter can work on by the submodule bypass of breaking down, and by-pass switch is with auxiliary normally closed contact.Submodule is the basic structure of transverter, submodule main circuit forms single-phase half H bridge construction by two switching tube K1-K2 with reverse parallel connection diode and direct current capacitors C, or forms single-phase H bridge construction by four switching tube K1-K4 with reverse parallel connection diode and direct current capacitors C.
Aspect the control strategy of modularization multi-level converter, controlling each submodule DC capacitor voltage (control of submodule capacitance voltage) in suitable scope is the important research of a class and engineering problem.In practical submodule capacitance voltage control method, brachium pontis direction of current is an important control parameter, need to measure in real time.Brachium pontis electric current also contains DC component and harmonic except fundametal compoment, cannot accurately measure by electromagnetic current transducer, and existing measuring method is by current sensor measurement brachium pontis electric current, then directly judges direction of current.This determination methods advantage is directly simple, but the shortcoming of this measuring method is: first, measurement point is on brachium pontis connecting line, dielectric level to current sensor and isolation power supply thereof requires very high, this dielectric level requires to have reached the class of insulation identical with transverter AC, generally can reach tens of to hundreds of kV levels.This causes high-voltage current sensor development or type selecting difficulty, has significantly improved complexity and the cost of current direction detection device.The second, once this sensor and accessory circuit thereof break down, cannot judge that brachium pontis electric current causes whole transverter to shut down, and has reduced device reliability.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of submodule direction of current decision circuitry that can significantly reduce current sensor insulating requirements and cost, also can significantly improve the cascade connection converter device brachium pontis of reliability.
In order to solve the problems of the technologies described above, employing technical scheme is: a kind of submodule direction of current decision circuitry of cascade connection converter device brachium pontis, comprises data selector U11, voltage comparator U12, high speed photo coupling U13, high pressure optocoupler U14-U16, current sensor TA1, resistance R 10-R19 and double-pole single throw KD1;
The punching magnet ring I1-4 of described current sensor TA1 is enclosed within on the electronegative potential output line of H bridge submodule or half H bridge submodule;
In-phase input end 5 pin of voltage comparator U12 described in the output termination of described current sensor TA1;
Described resistance R 10 is connected between in-phase input end 5 pin and reverse input end 4 pin of described voltage comparator U12; The reverse input end 4 pin ground connection of described voltage comparator U12; Output terminal 2 pin of described voltage comparator U12 connect negative pole 2 pin of described high speed photo coupling U13; Described resistance R 14 is connected between positive pole 1 pin and ﹢ 15V direct supply of described high speed photo coupling U13; Described resistance R 11 is connected between negative pole 2 pin and ﹢ 15V direct supply of described high speed photo coupling U13; Collector 4 pin of described high speed photo coupling U13 connect 6 pin of described data selector U11; The emitter 3 pin ground connection of described high speed photo coupling U13; Described resistance R 15 is connected between collector 4 pin and ﹢ 3.3V direct supply of described high speed photo coupling U13;
Negative pole 2 pin of described high pressure optocoupler U14 are through the auxiliary normally closed contact ground connection of the by-pass switch of described H bridge submodule or half H bridge submodule; Negative pole 2 pin of described high pressure optocoupler U14 are the signal input part I1-3 of described submodule direction of current decision circuitry;
Positive pole 1 pin of described high pressure optocoupler U14 connects ﹢ 24V direct supply through described resistance R 12; Collector 4 pin of described high pressure optocoupler U14 connect 3 pin of described data selector U11; The emitter 3 pin ground connection of described high pressure optocoupler U14; Described resistance R 13 is connected between collector 4 pin and ﹢ 3.3V direct supply of described high pressure optocoupler U14;
5 pin of described data selector U11 are the direction input end I1-1 of described submodule direction of current decision circuitry; 2 pin of data selector U11 are the state input end I1-2 of described submodule direction of current decision circuitry; 5 pin of described data selector U11 and 2 pin connect ﹢ 3.3V direct supply through the first contact K11-1 and the second contact K11-2 of described double-pole single throw K11 respectively; 1 pin of data selector U11 is connected with 2 pin; 7 pin of described data selector U11 connect negative pole 2 pin of described high pressure optocoupler U15; 4 pin of described data selector U11 connect negative pole 2 pin of described high pressure optocoupler U16;
Positive pole 1 pin of described high pressure optocoupler U15 connects ﹢ 3.3V direct supply through described resistance R 16; The emitter 3 pin ground connection of described high pressure optocoupler U15; Collector 4 pin of described high pressure optocoupler U15 connect ﹢ 3.3V direct supply through described resistance R 17;
Positive pole 1 pin of described high pressure optocoupler U16 connects ﹢ 3.3V direct supply through described resistance R 18; The emitter 3 pin ground connection of described high pressure optocoupler U16; Collector 4 pin of described high pressure optocoupler U16 connect ﹢ 3.3V direct supply through described resistance R 19;
Collector 4 pin of described high pressure optocoupler U15 are the direction output terminal O1-1 of described submodule direction of current decision circuitry; Collector 4 pin of described high pressure optocoupler U16 are the state output end O1-2 of described submodule direction of current decision circuitry.
The model of described data selector U11 is 74LS157; The model of described U12 voltage comparator is LM339; The model of described high pressure optocoupler U14-U16 is MOC306; The model of described high speed photo coupling U13 is PC817; The model of described current sensor TA1 is LF 2005-S.
The beneficial effects of the utility model are: in the utility model, all current sensors are arranged on submodule, the insulation against ground of submodule and insulating power supply powerup issue solve, in utility model, the dielectric level of current sensor is only required to meet submodule rated voltage insulation (in some kV), significantly reduces costs and complex for insulation degree; The utility model has adopted multiple current sensor cascade structure, there is redundancy properties, if the current sensor of installing on certain submodule exists fault, only need its place submodule bypass, do not affect circuit and work on, its reliability significantly improves compared with single-sensor.
Brief description of the drawings
Fig. 1 is H bridge main circuit submodule direction of current decision circuitry schematic diagram.
Fig. 2 is half H bridge main circuit submodule direction of current decision circuitry schematic diagram.
Fig. 3 is that cascade connection converter device brachium pontis (submodule is H bridge main circuit) direction of current judges principle schematic.
Fig. 4 is that cascade connection converter device brachium pontis (submodule is half H bridge main circuit) direction of current judges principle schematic.
In Fig. 3-4, SM1-SMn be the submodule of cascade connection converter device brachium pontis be half H bridge main circuit the 1st to n submodule; SMQ1-SMQn be the submodule of cascade connection converter device brachium pontis be H bridge main circuit the 1st to n submodule.
Embodiment
From the embodiment shown in Fig. 1-4, it comprises data selector U11, voltage comparator U12, high speed photo coupling U13, high pressure optocoupler U14-U16, current sensor TA1, resistance R 10-R19 and double-pole single throw KD1;
Described current sensor TA1 punching magnet ring I1-4 be enclosed within on the electronegative potential output line of H bridge submodule or half H bridge submodule;
In-phase input end 5 pin of voltage comparator U12 described in the output termination of described current sensor TA1;
Described resistance R 10 is connected between in-phase input end 5 pin and reverse input end 4 pin of described voltage comparator U12; The reverse input end 4 pin ground connection of described voltage comparator U12; Output terminal 2 pin of described voltage comparator U12 connect negative pole 2 pin of described high speed photo coupling U13; Described resistance R 14 is connected between positive pole 1 pin and ﹢ 15V direct supply of described high speed photo coupling U13; Described resistance R 11 is connected between negative pole 2 pin and ﹢ 15V direct supply of described high speed photo coupling U13; Collector 4 pin of described high speed photo coupling U13 connect 6 pin of described data selector U11; The emitter 3 pin ground connection of described high speed photo coupling U13; Described resistance R 15 is connected between collector 4 pin and ﹢ 3.3V direct supply of described high speed photo coupling U13;
Negative pole 2 pin of described high pressure optocoupler U14 are through the auxiliary normally closed contact ground connection of the by-pass switch of described H bridge submodule or half H bridge submodule; Negative pole 2 pin of described high pressure optocoupler U14 are the signal input part I1-3 of described submodule direction of current decision circuitry;
Positive pole 1 pin of described high pressure optocoupler U14 connects ﹢ 24V direct supply through described resistance R 12; Collector 4 pin of described high pressure optocoupler U14 connect 3 pin of described data selector U11; The emitter 3 pin ground connection of described high pressure optocoupler U14; Described resistance R 13 is connected between collector 4 pin and ﹢ 3.3V direct supply of described high pressure optocoupler U14;
5 pin of described data selector U11 are the direction input end I1-1 of described submodule direction of current decision circuitry; 2 pin of data selector U11 are the state input end I1-2 of described submodule direction of current decision circuitry; 5 pin of described data selector U11 and 2 pin connect ﹢ 3.3V direct supply through the first contact K11-1 and the second contact K11-2 of described double-pole single throw K11 respectively; 1 pin of data selector U11 is connected with 2 pin; 7 pin of described data selector U11 connect negative pole 2 pin of described high pressure optocoupler U15; 4 pin of described data selector U11 connect negative pole 2 pin of described high pressure optocoupler U16;
Positive pole 1 pin of described high pressure optocoupler U15 connects ﹢ 3.3V direct supply through described resistance R 16; The emitter 3 pin ground connection of described high pressure optocoupler U15; Collector 4 pin of described high pressure optocoupler U15 connect ﹢ 3.3V direct supply through described resistance R 17;
Positive pole 1 pin of described high pressure optocoupler U16 connects ﹢ 3.3V direct supply through described resistance R 18; The emitter 3 pin ground connection of described high pressure optocoupler U16; Collector 4 pin of described high pressure optocoupler U16 connect ﹢ 3.3V direct supply through described resistance R 19;
Collector 4 pin of described high pressure optocoupler U15 are the direction output terminal O1-1 of described submodule direction of current decision circuitry; Collector 4 pin of described high pressure optocoupler U16 are the state output end O1-2 of described submodule direction of current decision circuitry.
The model of described data selector U11 is 74LS157; The model of described U12 voltage comparator is LM339; The model of described high pressure optocoupler U14-U16 is MOC306; The model of described high speed photo coupling U13 is PC817; The model of described current sensor TA1 is LF 2005-S.
A brachium pontis of modularization multi-level converter is in series by the 1st submodule to the n submodule, and each submodule main circuit is parallel with by-pass switch Kp1-Kpn.Submodule main circuit can be half H bridge, can be also H bridge.Brachium pontis electric current positive dirction is defined as by the 1st submodule and flows to n submodule, and n is greater than 1 integer.The purpose of this utility model detects this direction of current exactly.
When the direction output terminal On-1 of the submodule direction of current decision circuitry of cascade connection converter device brachium pontis is high level and state output end On-2 while being low level, brachium pontis direction of current is for just; In the time that the direction output On-1 of the submodule direction of current decision circuitry of cascade connection converter device brachium pontis end is low level for low level and state output end On-2, brachium pontis direction of current is for negative; In the time that the state output end of the submodule direction of current decision circuitry of cascade connection converter device brachium pontis is high level, all submodule main circuits of brachium pontis are all bypassed, and brachium pontis direction of current judged result is invalid.When modularization multi-level converter operation, the situation that brachium pontis does not exist all submodule main circuits to be all bypassed, therefore necessarily have a submodule main circuit not being bypassed for detection of brachium pontis direction of current.
The course of work of the present utility model is as follows:
In the time measuring, submodule direction of current decision circuitry by the identical cascade connection converter device brachium pontis of n structure forms measurement mechanism, and the submodule direction of current decision circuitry of the cascade connection converter device brachium pontis that a described n structure is identical is the 1st to n submodule direction of current decision circuitry UNIT1-UNITn; The direction output terminal O1-1 of described the 1st submodule direction of current decision circuitry UNIT1 meets the direction input end I2-1 of described the 2nd submodule direction of current decision circuitry UNIT2; The state output end O1-2 of described the 1st submodule direction of current decision circuitry UNIT1 meets the state input end I2-2 of described the 2nd submodule direction of current decision circuitry UNIT2; The direction input end In-1 of described n submodule direction of current decision circuitry UNITn connects the direction output terminal of submodule direction of current decision circuitry before it; The state output end of the state input In-2 termination of described n submodule direction of current decision circuitry UNITn submodule direction of current decision circuitry before it;
The double-pole single throw KD1 closure of described the 1st submodule direction of current decision circuitry, the described the 2nd double-pole single throw KD2-KDn to n submodule direction of current decision circuitry disconnects.
Auxiliary normally closed contact one end ground connection of the 1st submodule direction of current decision circuitry Kp1, negative pole 2 pin of a termination high pressure optocoupler U14, the output signal of high pressure optocoupler U14 is input to 3 pin of data selector U11 by its collector 4 pin, and R12 and R13 are pull-up resistor.In the time that submodule main circuit is normally worked, by-pass switch Kp1 disconnects, and the auxiliary normally closed contact closure of by-pass switch Kp1, after high pressure optocoupler U14, to data selector U11 input low level; In the time that submodule main circuit is deactivated, Kp1 closure, the auxiliary normally closed contact of Kp1 disconnects, after high pressure optocoupler U14, to data selector U11 input high level.
The current sensor TA1 acquisition stream of the 1st submodule direction of current decision circuitry is crossed the current signal (arrow represents positive dirction) of submodule, be converted into voltage signal through R10, through the voltage zero-cross comparator circuit of over-voltage comparator U12 and pull-up resistor R11 composition, pass through again high speed photo coupling U13, be input to 6 pin of data selector U11, R14 and R15 are pull-up resistor.When the former limit of current sensor TA1, current flowing is timing, and voltage comparator U12 exports high level, after high speed photo coupling U13, to data selector U11 input high level; When the former limit of current sensor TA1 current flowing is when negative, voltage comparator U12 output low level, after high speed photo coupling U13, to data selector U11 input low level.
If 1 pin of data selector U11 i.e. " state input end I1-1 " is low level, the 4 pin outputs of data selector U11 equal 2 pin inputs, and 7 pin outputs equal 5 pin inputs.The output of data selector U11 is through high pressure optocoupler U15-16 isolation, and wherein R16-19 is pull-up resistor.Now, " direction output terminal " equals " direction input end ", and " state output end " equals " state input end ".
If 1 pin of data selector U11 i.e. " state input end I1-1 " is high level, the 4 pin outputs of data selector U11 equal 3 pin inputs (being the 4 pin outputs of U14), and 7 pin outputs equal 6 pin inputs (being the 4 pin outputs of U13).The output of data selector U11 is through high pressure optocoupler U15-16 isolation, and wherein R16-19 is pull-up resistor.Now, " direction output terminal " equals TA1 and detects and flow through the brachium pontis direction of current of submodule 1 (high level is for just, low level is for negative), " state output end " equals the on off state (high level is that submodule main circuit is bypassed, and low level is that submodule main circuit is not bypassed) of the subsidiary auxiliary normally closed contact of by-pass switch Kp1.
In the time that " state input end I1-2 " is low level, " direction output terminal O1-1 " equals " direction input end I1-1 ", and " state output end O1-2 " equals " state input end I1-2 "; In the time that " state input end I1-2 " is high level, " direction output terminal O1-2 " equals this submodule direction of current, and " state output end O1-2 " equals the state of this submodule by-pass switch.
After in whole circuit, n submodule connects, " brachium pontis direction of current " end represents the measured direction of current of first submodule not being bypassed in the 1st submodule to the n submodule (high level for just, low level is for bearing).When modularization multi-level converter operation, the situation that brachium pontis does not exist all submodule main circuits to be all bypassed, therefore necessarily have a submodule main circuit not being bypassed for detection of brachium pontis direction of current.
The state representation cascade connection converter device brachium pontis direction of current of the direction output terminal On-1 of n submodule direction of current decision circuitry.If the state of the direction output terminal On-1 of n submodule direction of current decision circuitry is high level, represent that cascade connection converter device brachium pontis direction of current is for just; The state of the direction output terminal On-1 of n submodule direction of current decision circuitry is low level, represents that cascade connection converter device brachium pontis direction of current is for negative.
Claims (1)
1. a submodule direction of current decision circuitry for cascade connection converter device brachium pontis, is characterized in that: comprise data selector U11, voltage comparator U12, high speed photo coupling U13, high pressure optocoupler U14-U16, current sensor TA1, resistance R 10-R19 and double-pole single throw KD1;
The punching magnet ring I1-4 of described current sensor TA1 is enclosed within on the electronegative potential output line of H bridge submodule or half H bridge submodule;
In-phase input end 5 pin of voltage comparator U12 described in the output termination of described current sensor TA1;
Described resistance R 10 is connected between in-phase input end 5 pin and reverse input end 4 pin of described voltage comparator U12; The reverse input end 4 pin ground connection of described voltage comparator U12; Output terminal 2 pin of described voltage comparator U12 connect negative pole 2 pin of described high speed photo coupling U13; Described resistance R 14 is connected between positive pole 1 pin and ﹢ 15V direct supply of described high speed photo coupling U13; Described resistance R 11 is connected between negative pole 2 pin and ﹢ 15V direct supply of described high speed photo coupling U13; Collector 4 pin of described high speed photo coupling U13 connect 6 pin of described data selector U11; The emitter 3 pin ground connection of described high speed photo coupling U13; Described resistance R 15 is connected between collector 4 pin and ﹢ 3.3V direct supply of described high speed photo coupling U13;
Negative pole 2 pin of described high pressure optocoupler U14 are through the auxiliary normally closed contact ground connection of the by-pass switch of described H bridge submodule or half H bridge submodule; Negative pole 2 pin of described high pressure optocoupler U14 are the signal input part I1-3 of described submodule direction of current decision circuitry;
Positive pole 1 pin of described high pressure optocoupler U14 connects ﹢ 24V direct supply through described resistance R 12; Collector 4 pin of described high pressure optocoupler U14 connect 3 pin of described data selector U11; The emitter 3 pin ground connection of described high pressure optocoupler U14; Described resistance R 13 is connected between collector 4 pin and ﹢ 3.3V direct supply of described high pressure optocoupler U14;
5 pin of described data selector U11 are the direction input end I1-1 of described submodule direction of current decision circuitry; 2 pin of data selector U11 are the state input end I1-2 of described submodule direction of current decision circuitry; 5 pin of described data selector U11 and 2 pin connect ﹢ 3.3V direct supply through the first contact K11-1 and the second contact K11-2 of described double-pole single throw K11 respectively; 1 pin of data selector U11 is connected with 2 pin; 7 pin of described data selector U11 connect negative pole 2 pin of described high pressure optocoupler U15; 4 pin of described data selector U11 connect negative pole 2 pin of described high pressure optocoupler U16;
Positive pole 1 pin of described high pressure optocoupler U15 connects ﹢ 3.3V direct supply through described resistance R 16; The emitter 3 pin ground connection of described high pressure optocoupler U15; Collector 4 pin of described high pressure optocoupler U15 connect ﹢ 3.3V direct supply through described resistance R 17;
Positive pole 1 pin of described high pressure optocoupler U16 connects ﹢ 3.3V direct supply through described resistance R 18; The emitter 3 pin ground connection of described high pressure optocoupler U16; Collector 4 pin of described high pressure optocoupler U16 connect ﹢ 3.3V direct supply through described resistance R 19;
Collector 4 pin of described high pressure optocoupler U15 are the direction output terminal O1-1 of described submodule direction of current decision circuitry; Collector 4 pin of described high pressure optocoupler U16 are the state output end O1-2 of described submodule direction of current decision circuitry;
The model of described data selector U11 is 74LS157; The model of described U12 voltage comparator is LM339; The model of described high pressure optocoupler U14-U16 is MOC306; The model of described high speed photo coupling U13 is PC817; The model of described current sensor TA1 is LF 2005-S.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420217985.9U CN203858283U (en) | 2014-04-30 | 2014-04-30 | Sub-module current direction judgment circuit of cascaded converter arm |
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| CN201420217985.9U CN203858283U (en) | 2014-04-30 | 2014-04-30 | Sub-module current direction judgment circuit of cascaded converter arm |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238352A (en) * | 2016-08-30 | 2016-12-21 | 扬州江新电子有限公司 | A kind of bi-directional symmetrical type integrated device separator control circuit and method for separating |
| PL423144A1 (en) * | 2017-10-12 | 2019-04-23 | Akademia Gorniczo Hutnicza Im Stanislawa Staszica W Krakowie | System for measuring voltage with galvanic separation |
| CN111917318A (en) * | 2020-07-08 | 2020-11-10 | 南京南瑞继保电气有限公司 | Bridge arm current direction determination method of modular multilevel converter |
-
2014
- 2014-04-30 CN CN201420217985.9U patent/CN203858283U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238352A (en) * | 2016-08-30 | 2016-12-21 | 扬州江新电子有限公司 | A kind of bi-directional symmetrical type integrated device separator control circuit and method for separating |
| CN106238352B (en) * | 2016-08-30 | 2018-12-11 | 扬州江新电子有限公司 | A kind of bi-directional symmetrical type integrated device sorting machine control circuit and method for separating |
| PL423144A1 (en) * | 2017-10-12 | 2019-04-23 | Akademia Gorniczo Hutnicza Im Stanislawa Staszica W Krakowie | System for measuring voltage with galvanic separation |
| CN111917318A (en) * | 2020-07-08 | 2020-11-10 | 南京南瑞继保电气有限公司 | Bridge arm current direction determination method of modular multilevel converter |
| CN111917318B (en) * | 2020-07-08 | 2021-12-10 | 南京南瑞继保电气有限公司 | Bridge arm current direction determination method of modular multilevel converter |
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Granted publication date: 20141001 Termination date: 20160430 |