CN108199575A - A kind of high-power converter soft starting circuit - Google Patents

A kind of high-power converter soft starting circuit Download PDF

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Publication number
CN108199575A
CN108199575A CN201810140330.9A CN201810140330A CN108199575A CN 108199575 A CN108199575 A CN 108199575A CN 201810140330 A CN201810140330 A CN 201810140330A CN 108199575 A CN108199575 A CN 108199575A
Authority
CN
China
Prior art keywords
circuit
fuse
power
rectifier diode
diode component
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.)
Pending
Application number
CN201810140330.9A
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Chinese (zh)
Inventor
徐耀
赵勇
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.)
Renergy Electric Tianjin Ltd
Original Assignee
Renergy Electric Tianjin 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 Renergy Electric Tianjin Ltd filed Critical Renergy Electric Tianjin Ltd
Priority to CN201810140330.9A priority Critical patent/CN108199575A/en
Publication of CN108199575A publication Critical patent/CN108199575A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • H02M1/325Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

Abstract

The invention discloses a kind of high-power converter soft starting circuit, including inverter loop and the bypass circuit being arranged on inverter loop;Bypass circuit includes rectifier diode component V, at least one charging resistor R, AC fuse FU1, DC fuse FU2 and contactor KM1;The high-power converter soft starting circuit can reduce surge impact of the power supply to the DC capacitor of busbar, realize the complete soft start of system.

Description

A kind of high-power converter soft starting circuit
Technical field
The present invention relates to technical field of wind power generation, more particularly to a kind of high-power converter soft starting circuit.
Background technology
Wind energy has become the renewable clear energy sources that current techniques are most ripe, most have scale development condition.Wind-power electricity generation Unit is a set of automatic adjustment, unattended automatic equipment;And carry the current transformer of main converting electrical energy task then It is the pith in whole system.
Either double feed wind power generator group current transformer or total power generating set current transformer are all to use AC/DC, The conversion regime of DC/AC, DC dc bus uses a large amount of DC capacitor, in this way in current transformer start-up course, if directly Network voltage is passed through, according to I=C*dU/dt, capacitance generation can be caused greatly to shove, it is therefore desirable to which bypass is set in net side circuit A soft starting circuit is put, after busbar voltage is increased to certain value by the form for increasing impedance, accesses network voltage, in this way Avoid the excessive generation shoved.
Mainly by grid-connected switch bypass, grid side accesses net side by resistance and switchs the charging modes generally used now The power device exchange side of rear end charges, and circuit is as shown in Figure 1, charging treats that DC bus-bar voltage reaches certain numerical value later Later, grid-connected switch is closed, then resistance loop cut off, the drawbacks of such method is the continuous hair needed with wind-powered electricity generation industry Exhibition, the capacity of wind turbine also develop to increased direction, are all to carry out electric energy conversion using power electronic equipment, all suffer from defeated The phenomenon that harmonic wave capacity increase gone out, and then filter circuit capacity is caused to become larger, the capacity of filter capacitor becomes larger, such exchange side Filter capacitor in parallel has shared fractional voltage Of, and d-c bus voltage value is made to be extremely difficult to expection voltage, is unable to reach soft open Dynamic effect, reaches expection voltage, the charging time can increase or charging current even if to charging resistor parameter recalculate Increase, charge circuit device capacitance is caused to increase, volume increases, and increases current transformer cost and uses space.In addition, use power The rectification that the reversed fast diode of device inside charges, influences the power device service life.
Invention content
The object of the present invention is to provide a kind of high-power converter soft starting circuits.
For this purpose, technical solution of the present invention is as follows:
A kind of high-power converter soft starting circuit, including inverter loop, inverter loop includes being arranged on direct current mother Filter capacitor C1 and three groups of power device units for being arranged on filter capacitor C1 both ends parallel between line positive and negative anodes;Every group of power Device cell includes two identical power modules being cascaded;Each power module includes a triode VT and diode D being connected in parallel between triode VT collector and emitters;Two power moulds of every group of power device unit A circuit composition three-phase voltage circuit is drawn between block respectively;Inductance L and protection switch are in series on every circuit;It is same with this When, a star-like capacitance C being made of three capacitances is further included, three pins of star-like capacitance C are connected respectively to three-phase voltage Between inductance L and protection switch on circuit;Further include the bypass circuit being arranged on inverter loop;Bypass circuit includes whole Flow diode assembly V, at least one charging resistor R, AC fuse FU1, DC fuse FU2 and contactor KM1;Rectification two The positive pin of pole pipe component V connects dc bus anode by DC fuse FU2, and the negative pin of rectifier diode component V passes through DC fuse FU2 connects the cathode of dc bus;Charging electricity is additionally provided between DC fuse FU2 and rectifier diode component Hinder R;Contactor KM1 has been sequentially connected in series on the three-line that three AC pins of rectifier diode component V are drawn and has been exchanged and has been melted Disconnected device FU1;Three AC fuse FU1 are connected respectively on the circuit after three protection switch of inverter loop, so as to make side Road circuit forming circuit.
Further, the charging resistor R quantity is one, is arranged on the anode and direct current of rectifier diode component V Between fuse FU2.
Further, the charging resistor R quantity is two, be separately positioned on the anode of rectifier diode component V with Between DC fuse FU2 between the cathode of rectifier diode component V and DC fuse FU2.
Further, the protection switch is circuit breaker Q.
Further, the protection switch is contactor KM2, and breaker is provided on the right side of contactor.
Compared with prior art, which can reduce direct current of the power supply to busbar The surge impact of appearance realizes the complete soft start of system, and in the short circuit of soft start exchange side, rectifier diode breakdown, direct current Effective circuit protection effect is carried out when side short circuit or resistance failure, in order to avoid the state of affairs is magnified, increases reliability, improves high-power The working life of current transformer, is widely used.
Description of the drawings
Fig. 1 is the circuit diagram of existing soft starting circuit.
Fig. 2 is the circuit diagram of the first soft starting circuit provided by the invention.
Fig. 3 is the circuit diagram of second of soft starting circuit provided by the invention.
Fig. 4 is the circuit diagram of the third soft starting circuit provided by the invention.
Fig. 5 is the circuit diagram of the 4th kind of soft starting circuit provided by the invention.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair It is bright to have any restrictions.
Embodiment one:
A kind of high-power converter soft starting circuit, as shown in Figure 2-5, including inverter loop, inverter loop includes The filter capacitor C1 and three groups of power devices for being arranged on filter capacitor C1 both ends parallel being arranged between dc bus positive and negative anodes Unit;Every group of power device unit includes two identical power modules being cascaded;Each power module is equal The diode D between triode VT collector and emitters is connected in parallel on including a triode VT and one;Every group of power device A circuit composition three-phase voltage circuit is drawn between two power modules of unit respectively;Be in series on every circuit inductance L and Protection switch;At the same time, a star-like capacitance C being made of three capacitances, three pins difference of star-like capacitance C are further included It is connected between inductance L and the protection switch on three-phase voltage circuit;Further include the bypass circuit being arranged on inverter loop; Bypass circuit includes rectifier diode component V, at least one charging resistor R, AC fuse FU1, DC fuse FU2 and connects Tentaculum KM1;The positive pin of rectifier diode component V connects dc bus anode, rectifier diode component by DC fuse FU2 The negative pin of V connects the cathode of dc bus by DC fuse FU2;Between DC fuse FU2 and rectifier diode component It is additionally provided with charging resistor R;Contact has been sequentially connected in series on the three-line that three AC pins of rectifier diode component V are drawn Device KM1 and AC fuse FU1;Three AC fuse FU1 are connected respectively to the line after three protection switch of inverter loop On the road, so as to be formed into a loop bypass circuit.
The charging resistor R quantity is one, is arranged on the anode of rectifier diode component V and DC fuse FU2 Between;The protection switch is contactor KM2, and breaker is provided on the right side of contactor.
Embodiment 2:
The difference lies in the charging resistor R quantity is two, is separately positioned on two pole of rectification with embodiment 1 Between the anode of tube assembly V and DC fuse FU2 between the cathode of rectifier diode component V and DC fuse FU2.
Embodiment 3:
The difference lies in the protection switch is circuit breaker Q with embodiment 1.
Embodiment 4:
The difference lies in the charging resistor R quantity is two, is separately positioned on two pole of rectification with embodiment 1 Between the anode of tube assembly V and DC fuse FU2 between the cathode of rectifier diode component V and DC fuse FU2;It states Protection switch for contactor KM2, and breaker is provided on the right side of contactor.
The operation principle of high-power converter soft starting circuit provided by the invention is as follows:
Soft starting circuit exchange side is connected directly to the transformer of power grid box-type substation due to front end, large capacity (2MW with On) Wind turbines peak value of short can reach more than 20kA, it is necessary to the protection equipment that can be reached 50kA using breaking capacity is come When ensureing this loop fault can the source of trouble of disjunction in time, in order to avoid the extension that causes the accident, therefore use AC fuse FU1;
DC side, which breaks down, is likely to occur in charging resistor R front-end and back-end, a kind of situation charging resistor R to direct current mother Short trouble occurs for line capacitance C1, and when dc bus energy is by DC fuse FU2, DC fuse FU2 disjunctions are another Situation charging resistor R breaks down to circuit between rectifier diode or due to the failure that diode breakdown occurs, due to filling Resistance R exists, and the power limited that dc bus provides, to ensure rapid disengagement failure source, while the type selecting of resistance is ensureing In the case of smaller power and volume, it will not be burnt because excessive fault current is born for a long time, cause the accident expansion Bigization, thus it is very fast using breaking speed, to fault current than more sensitive fastp-acting fuse FU2;
The high-power converter soft starting circuit that this programme is provided be used in full power convertor in, use two resistance values for 20 Ω, power are connected in series to rectifier diode component V to direct current positive bus and rectifier bridge to negative busbar respectively for 400W charging resistors R Circuit on, when detecting that busbar voltage reaches 1.2 times of network voltage, be closed protection switch, flow through protection switch to rear The moment impact current peak at end is about 2300A, filter capacitor C1 and dc-link capacitance dash current peak value difference 1300A And 1550A, filter capacitor C1 parameter requests can be met, it is different since the charging voltage that setting dc bus need to reach is identical Embodiment protection switch combined floodgate moment impact electric current, filter capacitor C1 and dc bus dash current peak value are essentially identical, three-phase Peak power is 3*9.42=28.26kW.
Electric current is surveyed in bypass circuit rectifier diode component V exchanges and direct current surveys current peak and respectively may be about 27A and 28A, is handed over Flowing side increases by three AC10A, 690V AC fuse FU1, and DC side increases by two DC12A, 1000V DC fuse FU2, filter The wave capacitance C1 charging time is 2.1s, fully meets startup time requirement.

Claims (5)

1. a kind of high-power converter soft starting circuit, including inverter loop, inverter loop includes being arranged on dc bus Filter capacitor C1 and three groups of power device units for being arranged on filter capacitor C1 both ends parallel between positive and negative anodes;Every group of power device Part unit includes two identical power modules being cascaded;Each power module includes a triode VT An and diode D being connected in parallel between triode VT collector and emitters;Two power modules of every group of power device unit Between draw circuit composition three-phase voltage circuit respectively;Inductance L and protection switch are in series on every circuit;It is same with this When, a star-like capacitance C being made of three capacitances is further included, three pins of star-like capacitance C are connected respectively to three-phase voltage Between inductance L and protection switch on circuit;It is characterized in that, further include the bypass circuit being arranged on inverter loop;It is other Road circuit includes rectifier diode component V, at least one charging resistor R, AC fuse FU1, DC fuse FU2 and contact Device KM1;The positive pin of rectifier diode component V meets dc bus anode, rectifier diode component V by DC fuse FU2 Negative pin the cathode of dc bus is connect by DC fuse FU2;Between DC fuse FU2 and rectifier diode component also It is provided with charging resistor R;Contactor has been sequentially connected in series on the three-line that three AC pins of rectifier diode component V are drawn KM1 and AC fuse FU1;Three AC fuse FU1 are connected respectively to the circuit after three protection switch of inverter loop On, so as to be formed into a loop bypass circuit.
2. high-power converter soft starting circuit according to claim 1, which is characterized in that the charging resistor R numbers It is one to measure, and is arranged between the anode of rectifier diode component V and DC fuse FU2.
3. high-power converter soft starting circuit according to claim 1, which is characterized in that the charging resistor R numbers It is two to measure, and is separately positioned between the anode of rectifier diode component V and DC fuse FU2 and rectifier diode component V Cathode and DC fuse FU2 between.
4. the high-power converter soft starting circuit according to any one in claim 2~3, which is characterized in that described Protection switch be circuit breaker Q.
5. the high-power converter soft starting circuit according to any one in claim 2~3, which is characterized in that described Protection switch for contactor KM2, and breaker is provided on the right side of contactor.
CN201810140330.9A 2018-02-11 2018-02-11 A kind of high-power converter soft starting circuit Pending CN108199575A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810140330.9A CN108199575A (en) 2018-02-11 2018-02-11 A kind of high-power converter soft starting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810140330.9A CN108199575A (en) 2018-02-11 2018-02-11 A kind of high-power converter soft starting circuit

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CN108199575A true CN108199575A (en) 2018-06-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110829575A (en) * 2019-10-23 2020-02-21 科华恒盛股份有限公司 Slow-start bus circuit, method and uninterruptible power supply
CN111697810A (en) * 2020-05-20 2020-09-22 惠州拓邦电气技术有限公司 Slow start control device and method for high-power inverter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203166759U (en) * 2013-04-03 2013-08-28 深圳市汇川技术股份有限公司 A soft starting circuit of a converter power loop circuit
CN204179938U (en) * 2014-11-07 2015-02-25 深圳市永联科技有限公司 The synchronous grid-connected system of a kind of inverter
CN105763037A (en) * 2016-05-16 2016-07-13 浙江工业大学 Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer
CN208028772U (en) * 2018-02-11 2018-10-30 天津瑞能电气有限公司 A kind of high-power converter soft starting circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203166759U (en) * 2013-04-03 2013-08-28 深圳市汇川技术股份有限公司 A soft starting circuit of a converter power loop circuit
CN204179938U (en) * 2014-11-07 2015-02-25 深圳市永联科技有限公司 The synchronous grid-connected system of a kind of inverter
CN105763037A (en) * 2016-05-16 2016-07-13 浙江工业大学 Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer
CN208028772U (en) * 2018-02-11 2018-10-30 天津瑞能电气有限公司 A kind of high-power converter soft starting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110829575A (en) * 2019-10-23 2020-02-21 科华恒盛股份有限公司 Slow-start bus circuit, method and uninterruptible power supply
CN111697810A (en) * 2020-05-20 2020-09-22 惠州拓邦电气技术有限公司 Slow start control device and method for high-power inverter

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Application publication date: 20180622