CN103441663A - Cascade type high-voltage inverter pre-charging circuit and control method thereof - Google Patents

Cascade type high-voltage inverter pre-charging circuit and control method thereof Download PDF

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Publication number
CN103441663A
CN103441663A CN2013103774175A CN201310377417A CN103441663A CN 103441663 A CN103441663 A CN 103441663A CN 2013103774175 A CN2013103774175 A CN 2013103774175A CN 201310377417 A CN201310377417 A CN 201310377417A CN 103441663 A CN103441663 A CN 103441663A
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China
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phase
net
switch
electrical network
frequency converter
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CN2013103774175A
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Chinese (zh)
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CN103441663B (en
Inventor
邱培春
孙开发
许贤昶
袁俊波
刘卫军
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广州智光电气股份有限公司
广州智光电机有限公司
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Priority to CN201310377417.5A priority Critical patent/CN103441663B/en
Publication of CN103441663A publication Critical patent/CN103441663A/en
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Abstract

The invention discloses a cascade type high-voltage inverter pre-charging circuit and a control method of the cascade type high-voltage inverter pre-charging circuit. The cascade type high-voltage inverter pre-charging circuit comprises a power grid and a transformer, the transformer primary side comprises three phases, the three phases are respectively and electrically connected with the power grid, the cascade type high-voltage inverter pre-charging circuit further comprises a resistor, a first switch and a second switch, the resistor is connected with the first switch in parallel, one of the three phases of the transformer primary side is connected with the power grid through a wire, and the resistor and the second switch are arranged between the other two of the three phases of the transformer primary side and the power grid respectively. Before the high-voltage power is connected, the first switch and the second switch are turned off. After the high-voltage power is connected, pre-charging is carried out on a cascade type high-voltage inverter through the two phases, connected with the power grid, of the cascade type high-voltage inverter, the resistor has the current limiting function, and the safety of equipment is guaranteed. Meanwhile, compared with a general inverter, the cascade type high-voltage inverter is small in size and requires a simple pre-charging circuit.

Description

Precharge circuit for cascade high-voltage frequency converter and control method thereof
Technical field
The present invention relates to a kind of frequency-converter device technical field, particularly relate to precharge circuit for cascade high-voltage frequency converter and control method thereof.
Background technology
Cascaded high-voltage frequency converter, adopt the cell cube serial connection technology, have stable, without characteristics such as harmonic wave, direct voltage outputs, at home and abroad obtain a wide range of applications.
Cascaded high-voltage frequency converter generally comprises transformer, cell cube and controller, as shown in Figure 1, each of frequency converter is all to be in series through phase shift by a plurality of power cells mutually, wherein cell cube adopts and hands over the orthogonal translation circuit, filtering is carried out by electric capacity in centre, as shown in Figure 2, while switching on to cascaded high-voltage frequency converter, this electric capacity will there will be a very large pre-charge current, easily damage electric capacity, general cascaded high-voltage frequency converter, a pre-charge resistance and the by-pass switch in parallel with this pre-charge resistance can be set between the rectifier bridge of each cell cube and electric capacity, pre-charge resistance plays the effect of current limliting when cascaded high-voltage frequency converter is switched on, prevent capacitance damage, but, in the system of cascaded high-voltage frequency converter, tens even more cell cubes have been generally included, each cell cube needs to arrange a pre-charge resistance and by-pass switch thereof, will cause like this volume of cascaded high-voltage frequency converter very large, cost is also very high, also very inconvenient when controlling.
Summary of the invention
The object of the present invention is to provide a kind of precharge circuit for cascade high-voltage frequency converter simple in structure, with low cost.
A further object of the invention is to provide a kind of control method of controlling precharge circuit for cascade high-voltage frequency converter simple, with low cost.
In order to realize purpose of the present invention, the technical scheme of taking is:
A kind of precharge circuit for cascade high-voltage frequency converter, comprise electrical network, transformer, the transformer primary side comprises three phases, three are electrically connected with electrical network respectively mutually, also comprise resistance, the first switch, second switch, resistance and the first switch are in parallel, and three of the transformer primary side have one to be connected by wire with electrical network in mutually, resistance and second switch be separately positioned on three of the transformer primary side mutually between two phases of residue and electrical network.
Before connecting high-tension electricity, disconnect the first switch and second switch, the cascaded high-voltage frequency converter primary side only has two-phase to be connected with electrical network, wherein one directly is connected with electrical network by wire, another is connected with electrical network by resistance, after connecting high-tension electricity, the two-phase be connected with electrical network in cascaded high-voltage frequency converter is to cascaded high-voltage frequency converter precharge, resistance plays metering function, in this way, reduced pre-charge current, guaranteed the safe handling of equipment, simultaneously, whole cascaded high-voltage frequency converter only need be used the resistance and two control switchs that play metering function, for general cascaded high-voltage frequency converter, cascaded high-voltage frequency converter volume of the present invention is less, the pre-charge circuit needed is simpler, reduced cost, also convenient during control.
Below technical scheme is further illustrated:
Preferably, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, resistance and the first switch are arranged between net side first-phase and electrical network, second switch is arranged between net side second-phase and electrical network, and net side third phase is connected by wire with electrical network.
Preferably, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, resistance and the first switch are arranged between net side first-phase and electrical network, between net side second-phase and electrical network, by wire, be connected, second switch is arranged between net side third phase and electrical network.
Preferably, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, second switch is arranged between net side first-phase and electrical network, resistance and the first switch are arranged between net side second-phase and electrical network, between net side third phase and electrical network, by wire, are connected.
Preferably, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, second switch is arranged between net side first-phase and electrical network, between net side second-phase and electrical network, by wire, be connected, resistance and the first switch are arranged between net side third phase and electrical network.
Preferably, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, between net side first-phase and electrical network, by wire, be connected, resistance and the first switch are arranged between net side second-phase and electrical network, and second switch is arranged between net side third phase and electrical network.
Preferably, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, between net side first-phase and electrical network, by wire, be connected, second switch is arranged between net side second-phase and electrical network, and resistance and the first switch are arranged between net side third phase and electrical network.
The present invention also provides a kind of control method of precharge circuit for cascade high-voltage frequency converter, comprise the following steps: connect and control power supply, under holding state, disconnect the first switch and second switch, connect high-tension electricity when keeping the first switch, second switch in off-state, elapsed time T, closed the first switch and second switch, precharge completes.
Before connecting high-tension electricity, keep the first switch, second switch in off-state, after connecting high-tension electricity, the process T time is closed the first switch, second switch again, this mode can guarantee that equipment carries out safe precharge, after elapsed time T, pre-charge current is reduced to the value of a safety, and at this moment, with regard to closed the first switch of energy, second switch, precharge completes.
Preferably, when the capacitance voltage in cell cube reaches rated voltage 60%-80%, closed the first switch and second switch.When the capacitance voltage in cell cube reaches rated voltage 60%-80%, pre-charge current will drop to a comparatively safe value, at this moment closed the first switch, second switch, and precharge completes.
Preferably, when the capacitance voltage in cell cube reaches rated voltage 70%, closed the first switch and second switch.
Advantage of the present invention is:
Precharge circuit for cascade high-voltage frequency converter of the present invention and control method thereof, before connecting high-tension electricity, disconnect the first switch and second switch, the cascaded high-voltage frequency converter primary side only has two-phase to be connected with electrical network, wherein one directly is connected with electrical network by wire, another is connected with electrical network by resistance, after connecting high-tension electricity, the two-phase be connected with electrical network in cascaded high-voltage frequency converter is to cascaded high-voltage frequency converter precharge, resistance plays metering function, in this way, reduced pre-charge current, guaranteed the safe handling of equipment, simultaneously, whole cascaded high-voltage frequency converter only need be used the resistance and two control switchs that play metering function, for general cascaded high-voltage frequency converter, cascaded high-voltage frequency converter volume of the present invention is less, the pre-charge circuit needed is simpler, reduced cost, also convenient during control.
Cascaded high-voltage frequency converter of the present invention has three phases, three have between a phase corresponding with electrical network in mutually and connect by wire, between all the other two phases corresponding with electrical network, resistance and second switch are set respectively, because three of cascaded high-voltage frequency converters are equivalent mutually, resistance, second switch, directly by wire, connect six kinds of situations can be arranged, above-mentioned six kinds of situations all can guarantee that equipment reaches safe pre-charge process, the user can, according to different needs, be chosen between different phases resistance, second switch, wire are set.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of cascaded high-voltage frequency converter;
Fig. 2 is the schematic diagram of cell cube in cascaded high-voltage frequency converter;
Fig. 3 is the schematic diagram of cascade type high-voltage frequency converter pre-charging circuit of the present invention;
Fig. 4 is the block diagram of the control method of cascade type high-voltage frequency converter pre-charging circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated:
Consult Fig. 1-3, in an embodiment of the present invention, a kind of precharge circuit for cascade high-voltage frequency converter, comprise electrical network, transformer, the transformer primary side comprises three phases, three are electrically connected with electrical network respectively mutually, also comprise resistance R, the first K switch M1, second switch KM2, resistance R and the first K switch M1 are in parallel, three of the transformer primary side have one to be connected by wire with electrical network in mutually, resistance R and second switch KM2 be separately positioned on three of the transformer primary side mutually between two phases of residue and electrical network.
Before connecting high-tension electricity, disconnect the first K switch M1 and second switch KM2, the cascaded high-voltage frequency converter primary side only has two-phase to be connected with electrical network, wherein one directly is connected with electrical network by wire, another is connected with electrical network by resistance R, after connecting high-tension electricity, the two-phase be connected with electrical network in cascaded high-voltage frequency converter is to cascaded high-voltage frequency converter precharge, resistance R plays metering function, in this way, reduced pre-charge current, guaranteed the safe handling of equipment, simultaneously, whole cascaded high-voltage frequency converter only need be used the resistance R and two control switchs that play metering function, for general cascaded high-voltage frequency converter, cascaded high-voltage frequency converter volume of the present invention is less, the pre-charge circuit needed is simpler, reduced cost, also convenient during control.
Embodiment 1:
Three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, resistance R and the first K switch M1 are arranged between net side first-phase and electrical network, second switch KM2 is arranged between net side second-phase and electrical network, and net side third phase is connected by wire with electrical network.
Embodiment 2:
Three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, resistance R and the first K switch M1 are arranged between net side first-phase and electrical network, between net side second-phase and electrical network, by wire, be connected, second switch KM2 is arranged between net side third phase and electrical network.
Embodiment 3:
Three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, second switch KM2 is arranged between net side first-phase and electrical network, resistance R and the first K switch M1 are arranged between net side second-phase and electrical network, between net side third phase and electrical network, by wire, are connected.
Embodiment 4:
Three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, second switch KM2 is arranged between net side first-phase and electrical network, between net side second-phase and electrical network, by wire, be connected, resistance R and the first K switch M1 are arranged between net side third phase and electrical network.
Embodiment 5:
Three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, between net side first-phase and electrical network, by wire, be connected, resistance R and the first K switch M1 are arranged between net side second-phase and electrical network, and second switch KM2 is arranged between net side third phase and electrical network.
Embodiment 6:
Three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, between net side first-phase and electrical network, by wire, be connected, second switch KM2 is arranged between net side second-phase and electrical network, and resistance R and the first K switch M1 are arranged between net side third phase and electrical network.
As shown in Figure 3,4, the present invention also provides a kind of control method of precharge circuit for cascade high-voltage frequency converter, comprise the following steps: connect and control power supply, under holding state, disconnect the first K switch M1 and second switch KM2, connect high-tension electricity, elapsed time T when keeping the first K switch M1, second switch KM2 in off-state, closed the first K switch M1 and second switch KM2, precharge completes.
Before connecting high-tension electricity, keep the first K switch M1, second switch KM2 in off-state, after connecting high-tension electricity, the process T time is closed the first K switch M1, second switch KM2 again, this mode can guarantee that equipment carries out safe precharge, after elapsed time T, pre-charge current is reduced to the value of a safety, and at this moment, with regard to energy closed the first K switch M1, second switch KM2, precharge completes.
When the capacitance voltage in cell cube reaches rated voltage 60%-80%, especially 70% the time, closed the first K switch M1 and second switch KM2.When the capacitance voltage in cell cube reaches rated voltage 60%-80%, pre-charge current will drop to a comparatively safe value, at this moment closed the first switch, second switch, and precharge completes.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (9)

1. a precharge circuit for cascade high-voltage frequency converter, comprise electrical network, transformer, the transformer primary side comprises three phases, three are electrically connected with electrical network respectively mutually, it is characterized in that, also comprise resistance, the first switch, second switch, resistance and the first switch are in parallel, three of the transformer primary side have one to be connected by wire with electrical network in mutually, resistance and second switch be separately positioned on three of the transformer primary side mutually between two phases of residue and electrical network.
2. precharge circuit for cascade high-voltage frequency converter according to claim 1, it is characterized in that, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, resistance and the first switch are arranged between net side first-phase and electrical network, second switch is arranged between net side second-phase and electrical network, and net side third phase is connected by wire with electrical network.
3. precharge circuit for cascade high-voltage frequency converter according to claim 1, it is characterized in that, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, resistance and the first switch are arranged between net side first-phase and electrical network, between net side second-phase and electrical network, by wire, be connected, second switch is arranged between net side third phase and electrical network.
4. precharge circuit for cascade high-voltage frequency converter according to claim 1, it is characterized in that, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, second switch is arranged between net side first-phase and electrical network, resistance and the first switch are arranged between net side second-phase and electrical network, between net side third phase and electrical network, by wire, are connected.
5. precharge circuit for cascade high-voltage frequency converter according to claim 1, it is characterized in that, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, second switch is arranged between net side first-phase and electrical network, between net side second-phase and electrical network, by wire, be connected, resistance and the first switch are arranged between net side third phase and electrical network.
6. precharge circuit for cascade high-voltage frequency converter according to claim 1, it is characterized in that, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, between net side first-phase and electrical network, by wire, be connected, resistance and the first switch are arranged between net side second-phase and electrical network, and second switch is arranged between net side third phase and electrical network.
7. precharge circuit for cascade high-voltage frequency converter according to claim 1, it is characterized in that, three of described transformer primary side are respectively net side first-phase, net side second-phase, net side third phase mutually, between net side first-phase and electrical network, by wire, be connected, second switch is arranged between net side second-phase and electrical network, and resistance and the first switch are arranged between net side third phase and electrical network.
8. the control method of a precharge circuit for cascade high-voltage frequency converter, it is characterized in that, comprise the following steps: connect and control power supply, under holding state, disconnect the first switch and second switch, connect high-tension electricity, elapsed time T when keeping the first switch, second switch in off-state, closed the first switch and second switch, precharge completes.
9. the control method of precharge circuit for cascade high-voltage frequency converter according to claim 8, is characterized in that, when the capacitance voltage in power cell reaches rated voltage 60%-80%, and closed the first switch and second switch.
CN201310377417.5A 2013-08-26 2013-08-26 Precharge circuit for cascade high-voltage frequency converter and control method thereof CN103441663B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105720893A (en) * 2014-12-02 2016-06-29 永济新时速电机电器有限责任公司 Traction converter with secondary filter circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1545198A (en) * 2003-09-28 2004-11-10 北京利德华福电气技术有限公司 Second generation high-voltage large-power frequency converter
CN102306938A (en) * 2011-09-09 2012-01-04 北京索英电气技术有限公司 Starting method for current transformer
JP2012210085A (en) * 2011-03-30 2012-10-25 Toyota Motor Corp Power source control device, motor drive system including the same, and method of controlling power source control device
CN203457041U (en) * 2013-08-26 2014-02-26 广州智光电气股份有限公司 Cascading-type high-voltage inverter pre-charging circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1545198A (en) * 2003-09-28 2004-11-10 北京利德华福电气技术有限公司 Second generation high-voltage large-power frequency converter
JP2012210085A (en) * 2011-03-30 2012-10-25 Toyota Motor Corp Power source control device, motor drive system including the same, and method of controlling power source control device
CN102306938A (en) * 2011-09-09 2012-01-04 北京索英电气技术有限公司 Starting method for current transformer
CN203457041U (en) * 2013-08-26 2014-02-26 广州智光电气股份有限公司 Cascading-type high-voltage inverter pre-charging circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105720893A (en) * 2014-12-02 2016-06-29 永济新时速电机电器有限责任公司 Traction converter with secondary filter circuit

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Address after: 510760 No. 51 Punan Road, Yunpu Industrial Zone, Huangpu District, Guangzhou City, Guangdong Province

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