CN104242625A - Five-level frequency converter precharging device, control device and control method - Google Patents
Five-level frequency converter precharging device, control device and control method Download PDFInfo
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- CN104242625A CN104242625A CN201410501298.4A CN201410501298A CN104242625A CN 104242625 A CN104242625 A CN 104242625A CN 201410501298 A CN201410501298 A CN 201410501298A CN 104242625 A CN104242625 A CN 104242625A
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Abstract
The invention relates to a five-level frequency converter pre-charging device which comprises a three-phase transformer T, a three-phase switch K and a three-phase AC power supply. The three-phase switch K is arranged between the three-phase transformer T and the three-phase AC power supply. The invention further relates to a control device of the precharging device. The control device comprises a power grid, a high-voltage switch S, the precharging device and a multiple-level frequency converter. The precharging device is arranged between an input filter and the multiple-level frequency converter; one end of the three-phase transformer T is connected between an input end of the multiple-level frequency converter and the input filter, and the other end of the three-phase transformer is connected to one end of the three-phase switch K; one end of the three-phase switch K is connected with the three-phase transformer, and the other end of the three-phase switch K is connected with the three-phase AC power supply; and the high-voltage switch S is arranged between the power grid and the input filter.
Description
Technical field
The present invention relates to a kind of pre-charging device, specifically a kind of multi-level frequency conversion device pre-charging device and control device and control method, belong to high voltage converter art field.
Background technology
For five-level converter, traditional charging circuit is by arranging high-pressure type relay and power resistor formation in each power cell, due to high-voltage relay and power resistor volume larger, cost is higher, and frequency converter contains multiple power cell, and this just causes the components and parts of high voltage converter many, volume is large, cost is high, the feature that power consumption is large, and therefore in the five-level high-voltage frequency converter system of reality, this charging method is difficult to be employed and promote.Rectification is used for containing diode in traditional charging circuit, then charge to capacitor, if the preset value of capacitor charging is higher, the volume of diode can be comparatively large, and cost also can be higher, simultaneously due to the dividing potential drop of power resistor, there is the problem that capacitor does not reach preset value after charging.Traditional charging circuit and charging method general frequency converter for a certain particular level number feature topological structure, narrow application range.Therefore, a kind of new scheme of exigence solves the problems of the technologies described above.
Summary of the invention
The present invention is just for the technical problem existed in prior art, a kind of five-level converter pre-charging device is provided and is provided with control device and the control method of this device, this device overall construction design is ingenious, compact conformation, easy to operate, the component number of whole high voltage converter can be reduced, reduce its volume, reduce cost, reduce power consumption; In addition this technical scheme saves rectifier diode and power resistor, and make capacitor Danone after charging enough reach preset value, the scope of application is wider.
To achieve these goals, technical scheme of the present invention is as follows: a kind of five-level converter pre-charging device, it is characterized in that, described pre-charging device comprises three-phase transformer T, threephase switch K, and three-phase alternating-current supply AC, described threephase switch K is arranged in the middle of three-phase transformer T and three-phase alternating-current supply AC.
As a modification of the present invention, described three-phase transformer is step-up transformer, and threephase switch K is low-voltage alternating-current switch, and three-phase alternating-current supply is low-tension supply, power frequency electric 380V.Described three-phase transformer is step-up transformer, and its secondary side impedance is comparatively large, and rely on direct impedance transformer can play the object of restriction pre-charge current amplitude, secondary side does not need to install power resistor additional.
A kind of control device being provided with pre-charging device as claimed in claim 1 or 2, described control device comprises electrical network, high-voltage switch gear S, pre-charging device and multi-level frequency conversion device, described pre-charging device is arranged between input filter and multi-level frequency conversion device, between the input that one end of described three-phase transformer T is connected to multi-level frequency conversion device and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter.
As a modification of the present invention, described multi-level frequency conversion device is the one in two level converters or three-level converter or five-level converter or other multi-level frequency conversion devices.
Be provided with a control method for the control device of pre-charging device, it is characterized in that, described rate-determining steps is as follows; Step 1, opens high-voltage switch gear S, and closed threephase switch K, by three-phase alternating-current supply AC, flows through threephase switch K, charge through transformer to the electric capacity in multi-level frequency conversion device; Step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device; Step 3, closed high switch S, disconnects threephase switch K, and multi-level frequency conversion device access electrical network, enters and treat running status.The operation principle of this control device, disconnect high-voltage switch gear S, closed threephase switch K, three-phase alternating-current supply AC is boosted by three-phase transformer T, and the ac voltage after boosting is generally got identical with grid side magnitude of voltage, and then the capacitor in multi-level frequency conversion device is charged, the voltage at capacitor two ends is detected simultaneously, when the magnitude of voltage of each capacitor all reaches supplementing with money in advance of setting, then cut-off switch K, closed high switch S, system then enters and treats running status.
A kind of control device and control method being provided with diode-clamped five-level frequency converter, it is characterized in that, described control device comprises pre-charging device, electrical network, high-voltage switch gear S, input filter, three-phase diode clamped five-level frequency converter, wherein pre-charging device, electrical network, high-voltage switch gear S, pre-charging device comprises three-phase transformer T, threephase switch K, and three-phase alternating-current supply AC, described threephase switch K is arranged in the middle of three-phase transformer T and three-phase alternating-current supply AC, described pre-charging device is arranged between input filter and diode-clamped five-level frequency converter, between the input that one end of described three-phase transformer T is connected to diode-clamped five-level frequency converter and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter, described diode-clamped five-level frequency converter control method is divided into three steps, step 1, open high-voltage switch gear S, Closing Switch K, by power supply AC, flow through K switch, through transformer, the electric capacity in five-level converter is charged, step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device, step 3, closed high switch S, disconnects threephase switch K, and three-phase diode clamped five-level frequency converter access electrical network, enters and treat running status.
A kind of control device and control method being provided with three-phase striding capacitance type five-level converter, it is characterized in that, described control device comprises pre-charging device, electrical network, high-voltage switch gear S, input filter, three-phase striding capacitance type five-level converter, described pre-charging device comprises three-phase transformer T, threephase switch K, and three-phase alternating-current supply AC, described threephase switch K is arranged in the middle of three-phase transformer T and three-phase alternating-current supply AC, described control device is arranged between input filter and three-phase striding capacitance type five-level converter, between the input that one end of described three-phase transformer T is connected to three-phase striding capacitance type five-level converter and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter, described control method is divided into three steps, and step 1 opens high-voltage switch gear S, and closed threephase switch K, by power supply AC, flows through threephase switch K, charge through transformer to the electric capacity in five-level converter, step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device, step 3, closed high switch S, disconnects threephase switch K, and three-phase striding capacitance type five-level converter access electrical network, enters and treat running status.
A kind of active neutral point clamp type five-level converter pre-charging device and control method, it is characterized in that, described pre-charging device comprises three-phase active neutral point clamp type five-level converter, electrical network, high-voltage switch gear S, input filter, three-phase active neutral point clamp type five-level converter, described pre-charging device is arranged between input filter and three-phase striding capacitance type five-level converter, between the input that one end of described three-phase transformer T is connected to three-phase striding capacitance type five-level converter and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter, described three-phase active neutral point clamp type five-level converter control method is divided into three steps, step 1, opens high-voltage switch gear S, closed threephase switch K, by three-phase alternating-current supply AC, flow through threephase switch K, through transformer, the electric capacity in five-level converter is charged, step 2, opens high-voltage switch gear S and K switch, excision pre-charging device, step 3, closed high switch S, cut-off switch K, three-phase active neutral point clamp type five-level converter, enters and treats running status.The order charged to the electric capacity in three-phase active neutral point clamp type five-level converter in described step 1 is as follows, first fill three capacitors in three-phase brachium pontis, treat that three capacitors reach preset value, then the capacitor of two on DC bus is pre-charged to preset value.
In control device, for the five-level converter of different topology structure, not identical with charging order to the charging method of its internal capacitor yet.But, the main principle of whole charging method is identical, described pre-charging device is as follows for the main principle of the five-level converter charging method of different topology structure, 1, when there is not capacitor in brachium pontis, when only having DC bus two ends to be connected with capacitor, directly the capacitor at DC bus two ends is charged; 2, when DC bus two ends are connected with capacitor, when having in each brachium pontis and only have a capacitor, after first the capacitor in brachium pontis will being charged to set point, the capacitor at DC bus two ends is being charged to set point; 2, when DC bus two ends are connected with capacitor, when having multiple capacitor in each brachium pontis, its charging order is as follows, first fill the capacitor near output, treat that three capacitors reach preset value, then fill time capacitor of close output, the like, till finally the capacitor on DC bus being charged to preset value.
Relative to prior art, advantage of the present invention is as follows, 1) overall construction design is ingenious, greatly reduces the component number of whole high voltage converter, reduces its volume, reduces cost, reduces power consumption; 2) this technical scheme saves rectifier diode and power resistor, makes capacitor can reach preset value after charging, realizes preset value by the turn ratio reasonably designing the former limit of three-phase transformer T and secondary; 3) this control device is applicable to the one in two level converters or three-level converter or five-level converter or other multi-level frequency conversion devices, and range of application is more extensive.
Accompanying drawing explanation
Fig. 1 is the general five-level converter circuit structure diagram comprising pre-charging device circuit of the present invention;
Fig. 2 is the diode-clamped five-level converter circuit structure figure comprising pre-charging device circuit of the present invention;
Fig. 3 is the striding capacitance type five-level converter circuit structure diagram comprising pre-charging device circuit of the present invention;
Fig. 4 is the active neutral point clamp type five-level converter circuit structure diagram comprising pre-charging device circuit of the present invention;
Fig. 5 comprises the general five-level converter circuit structure diagram that pre-charging device of the present invention simplifies rear circuit.
Wherein, T is three-phase transformer, and K is threephase switch, and AC is three-phase alternating-current supply, and S is high-voltage switch gear.
Embodiment
In order to deepen the understanding of the present invention and understanding, below in conjunction with accompanying drawing, the invention will be further described and introduce.
embodiment 1:it is the general five-level converter circuit structure diagram comprising pre-charging device circuit of the present invention see Fig. 1, Fig. 1.As shown in Figure 1, described pre-charging device comprises 1 three-phase transformer T, 1 threephase switch K, and No. 1 three-phase alternating-current supply AC; One end of described three-phase transformer T can be connected between the input of five-level converter and input filter, also can be connected between high-voltage switch gear S and input filter, and the other end of three-phase transformer T connects one end of threephase switch K.One end of described threephase switch K connects three-phase transformer, and the other end connects three-phase alternating-current supply AC.
The control method of this control device is divided into three steps, step 1, opens high-voltage switch gear S, and closed threephase switch K, by three-phase first stream power supply AC, flows through threephase switch K, charge through transformer to the electric capacity in five-level converter; Step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device; Step 3, closed high switch S, disconnects threephase switch K, and five-level converter access electrical network, enters and treat running status.Described general five-level converter circuit structure, also can replace with general two level converter circuit structures or general three-level converter circuit structure or general multi-level frequency conversion device circuit structure.
embodiment 2:fig. 2 is the diode-clamped five-level converter circuit structure figure comprising pre-charging device circuit of the present invention, as shown in Figure 2, described diode-clamped five-level converter circuit structure figure comprises pre-charging device of the present invention, electrical network, high-voltage switch gear S, input filter, three-phase diode clamped five-level frequency converter, wherein pre-charging device, electrical network, high-voltage switch gear S, the position annexation of input filter is identical with embodiment 1.
Be divided into three steps for described diode-clamped five-level frequency converter control method, step 1, open high-voltage switch gear S, Closing Switch K, by power supply AC, flow through K switch, through transformer, the electric capacity in five-level converter is charged; Step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device; Step 3, closed high switch S, disconnects threephase switch K, and three-phase diode clamped five-level frequency converter access electrical network, enters and treat running status.
embodiment 3:see Fig. 3, Fig. 3 is the striding capacitance type five-level converter circuit structure diagram comprising pre-charging device circuit of the present invention, and as shown in Figure 3, described three-phase striding capacitance type five-level converter circuit structure diagram comprises pre-charging device of the present invention, electrical network, high-voltage switch gear S, input filter, three-phase striding capacitance type five-level converter, wherein pre-charging device, electrical network, high-voltage switch gear S, the position annexation of input filter is identical with embodiment 1.
Be divided into three steps, step 1 for described three-phase striding capacitance type five-level converter control method, open high-voltage switch gear S, closed threephase switch K, by power supply AC, flows through threephase switch K, charges through transformer to the electric capacity in five-level converter; Step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device; Step 3, closed high switch S, disconnects threephase switch K, and three-phase striding capacitance type five-level converter access electrical network, enters and treat running status.
The order charged to the electric capacity in three-phase striding capacitance type five-level converter in described step 1 is as follows, first fill three capacitors near output, treat that three capacitors reach preset value, fill time three capacitors of close output again, the like, finally the single capacitor on DC bus is pre-charged to preset value, be specially, shown in Fig. 3, first build pressure for Ca1, Cb1, Cc1, conduction device is Da3, Da4, Da5, Da6, Da7, Da8, Db3, Db4, Db5, Db6, Db7, Db8, Dc3, Dc4, Dc5, Dc6, Dc7, Dc8; By the voltage on hardware circuit respectively Detection capacitance Ca1, Cb1, Cc1, treat that the voltage of three electric capacity all reaches preset value, start to build pressure to electric capacity Ca2, Cb2, Cc2, conduction device is Da5, Da6, Da7, Da8, Db5, Db6, Db7, Db8, Dc5, Dc6, Dc7, Dc8; By the voltage on hardware circuit respectively Detection capacitance Ca2, Cb2, Cc2, treat that the voltage of three electric capacity all reaches preset value, start to build pressure to electric capacity Ca3, Cb3, Cc3, conduction device is Da7, Da8, Db7, Db8, Dc7, Dc8; By the voltage on hardware circuit respectively Detection capacitance Ca3, Cb3, Cc3, treat that the voltage of three electric capacity all reaches preset value, start to build pressure to electric capacity Cdc, need not any device of conducting.
embodiment 4:see Fig. 4, Fig. 4 is the active neutral point clamp type five-level converter circuit structure diagram comprising pre-charging device circuit of the present invention, and as shown in Figure 4, described three-phase active neutral point clamp type five-level converter circuit structure diagram comprises pre-charging device of the present invention, electrical network, high-voltage switch gear S, input filter, three-phase active neutral point clamp type five-level converter, wherein pre-charging device, electrical network, high-voltage switch gear S, the position annexation of input filter is identical with embodiment 1.
Be divided into three steps, step 1 for described three-phase active neutral point clamp type five-level converter control method, open high-voltage switch gear S, closed threephase switch K, by three-phase alternating-current supply AC, flow through threephase switch K, through transformer, the electric capacity in five-level converter is charged; Step 2, opens high-voltage switch gear S and K switch, excision pre-charging device; Step 3, closed high switch S, cut-off switch K, three-phase active neutral point clamp type five-level converter, enters and treats running status.The order charged to the electric capacity in three-phase active neutral point clamp type five-level converter in described step 1 is as follows, first fill three capacitors in three-phase brachium pontis, treat that three capacitors reach preset value, then the capacitor of two on DC bus is pre-charged to preset value.The charging method of described frequency converter inner capacitor is that the conducting and shutoff by controlling switching tube in frequency converter realizes, detailed process is as follows, capacitor charging order is that the conducting and shutoff by controlling switching tube in frequency converter realizes, as Fig. 4, be divided into 4 steps, step 1, when building pressure for Cup and Cdown, without the need to opening any switching tube, this stage is only to two electric capacity Cup and Cdown
Set up the voltage of half; Step 2, for flying capacitor Cfa, Cfb, Cfc build pressure, conduction device: Sa9, Sa10, Sb9, Sb10, Sc9, Sc10, and the voltage of flying capacitor all reaches set builds pressure value; Step 3, builds pressure, conduction device for Cup: Sa5, Sa6, Sb5, Sb6, Sc5, Sc6, builds pressure and terminates rear Up Highway UHW capacitance voltage and reach and set build pressure value; Step 4, builds pressure, conduction device for Cdown: Sa3, Sa4, Sb3, Sb4, Sc3, Sc4, builds pressure and terminates rear Down Highway capacitance voltage and reach and set build pressure value.
embodiment 5:see Fig. 5, described Fig. 5 comprises the general five-level converter circuit structure diagram that pre-charging device of the present invention simplifies rear circuit, method for simplifying is as follows, three-phase pre-charge circuit is reduced to single-phase pre-charge circuit, circuit after simplification comprises 1 single-phase transformer T, 1 K switch, and 1 road single phase alternating current power supply AC.After described pre-charging device simplifies, circuit breaker in middle K can be two-phase switch, also can be single-phase switch.After described pre-charging device simplifies, in circuit, single-phase transformer can be A phase and B phase with the connection of five-level converter, and also can be A phase and C phase, also can be B phase and C phase.
It should be noted that above-described embodiment, be not used for limiting protection scope of the present invention, equivalents done on the basis of technique scheme or the alternative scope all falling into the claims in the present invention and protect.
Claims (9)
1. a five-level converter pre-charging device, is characterized in that, described pre-charging device comprises three-phase transformer T, threephase switch K, and three-phase alternating-current supply AC, and described threephase switch K is arranged in the middle of three-phase transformer T and three-phase alternating-current supply AC.
2. five-level converter pre-charging device according to claim 1, is characterized in that, described three-phase transformer is step-up transformer, and threephase switch K is low-voltage alternating-current switch, and three-phase alternating-current supply is low-tension supply, power frequency electric 380V.
3. one kind is provided with the control device of pre-charging device as claimed in claim 1 or 2, described control device comprises electrical network, high-voltage switch gear S, pre-charging device and multi-level frequency conversion device, described pre-charging device is arranged between input filter and multi-level frequency conversion device, between the input that one end of described three-phase transformer T is connected to multi-level frequency conversion device and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter.
4. control device according to claim 3, is characterized in that, described multi-level frequency conversion device is the one in two level converters or three-level converter or five-level converter or other multi-level frequency conversion devices.
5. be provided with a control method for the control device of pre-charging device, it is characterized in that, described rate-determining steps is as follows; Step 1, opens high-voltage switch gear S, and closed threephase switch K, by three-phase alternating-current supply AC, flows through threephase switch K, charge through transformer to the electric capacity in multi-level frequency conversion device; Step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device; Step 3, closed high switch S, disconnects threephase switch K, and multi-level frequency conversion device access electrical network, enters and treat running status.
6. one kind is provided with control device and the control method of diode-clamped five-level frequency converter, it is characterized in that, described control device comprises pre-charging device, electrical network, high-voltage switch gear S, input filter, three-phase diode clamped five-level frequency converter, wherein pre-charging device, electrical network, high-voltage switch gear S, pre-charging device comprises three-phase transformer T, threephase switch K, and three-phase alternating-current supply AC, described threephase switch K is arranged in the middle of three-phase transformer T and three-phase alternating-current supply AC, described pre-charging device is arranged between input filter and diode-clamped five-level frequency converter, between the input that one end of described three-phase transformer T is connected to diode-clamped five-level frequency converter and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter, described diode-clamped five-level frequency converter control method is divided into three steps, step 1, open high-voltage switch gear S, Closing Switch K, by power supply AC, flow through K switch, through transformer, the electric capacity in five-level converter is charged, step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device, step 3, closed high switch S, disconnects threephase switch K, and three-phase diode clamped five-level frequency converter access electrical network, enters and treat running status.
7. one kind is provided with control device and the control method of three-phase striding capacitance type five-level converter, it is characterized in that, described control device comprises pre-charging device, electrical network, high-voltage switch gear S, input filter, three-phase striding capacitance type five-level converter, described pre-charging device comprises three-phase transformer T, threephase switch K, and three-phase alternating-current supply AC, described threephase switch K is arranged in the middle of three-phase transformer T and three-phase alternating-current supply AC, described control device is arranged between input filter and three-phase striding capacitance type five-level converter, between the input that one end of described three-phase transformer T is connected to three-phase striding capacitance type five-level converter and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter, described control method is divided into three steps, and step 1 opens high-voltage switch gear S, and closed threephase switch K, by power supply AC, flows through threephase switch K, charge through transformer to the electric capacity in five-level converter, step 2, opens high-voltage switch gear S and threephase switch K, excision pre-charging device, step 3, closed high switch S, disconnects threephase switch K, and three-phase striding capacitance type five-level converter access electrical network, enters and treat running status.
8. an active neutral point clamp type five-level converter pre-charging device and control method, it is characterized in that, described pre-charging device comprises three-phase active neutral point clamp type five-level converter, electrical network, high-voltage switch gear S, input filter, three-phase active neutral point clamp type five-level converter, described pre-charging device is arranged between input filter and three-phase striding capacitance type five-level converter, between the input that one end of described three-phase transformer T is connected to three-phase striding capacitance type five-level converter and input filter, the other end connects one end of threephase switch K, one end of described threephase switch K connects three-phase transformer, the other end connects three-phase alternating-current supply AC, described high-voltage switch gear S is arranged between electrical network and input filter, described three-phase active neutral point clamp type five-level converter control method is divided into three steps, step 1, opens high-voltage switch gear S, closed threephase switch K, by three-phase alternating-current supply AC, flow through threephase switch K, through transformer, the electric capacity in five-level converter is charged, step 2, opens high-voltage switch gear S and K switch, excision pre-charging device, step 3, closed high switch S, cut-off switch K, three-phase active neutral point clamp type five-level converter, enters and treats running status.
9. the order charged to the electric capacity in three-phase active neutral point clamp type five-level converter in step 1 described in is as follows, first fill three capacitors in three-phase brachium pontis, treat that three capacitors reach preset value, then the capacitor of two on DC bus is pre-charged to preset value.
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| CN106877709A (en) * | 2017-03-15 | 2017-06-20 | 中冶华天南京电气工程技术有限公司 | One kind is used for high voltage converter pre-charging device and method |
| CN108063547A (en) * | 2016-11-08 | 2018-05-22 | 台达电子工业股份有限公司 | Pre-charging device and frequency converter |
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| CN102594159B (en) * | 2012-02-16 | 2014-06-04 | 华为技术有限公司 | Intermediate-voltage concatenated frequency converter, pre-charging method and system |
| CN102983735B (en) * | 2012-12-21 | 2015-05-20 | 山东大学 | Pre-charge system and method for capacitor of modular multi-level matrix converter |
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| CN108063547A (en) * | 2016-11-08 | 2018-05-22 | 台达电子工业股份有限公司 | Pre-charging device and frequency converter |
| CN108063547B (en) * | 2016-11-08 | 2019-09-20 | 台达电子工业股份有限公司 | Pre-charging device and frequency converter |
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| CN109617445A (en) * | 2018-12-10 | 2019-04-12 | 上海交通大学 | Five-level converter DC side charging soft starting circuit and method |
| CN109617445B (en) * | 2018-12-10 | 2020-07-17 | 上海交通大学 | DC side charging soft start circuit and method for five-level converter |
| US11329569B2 (en) | 2020-01-03 | 2022-05-10 | Delta Electronics, Inc. | Power conversion system |
| US11374490B2 (en) | 2020-02-21 | 2022-06-28 | Delta Electronics, Inc. | Power conversion system |
| CN115333211A (en) * | 2022-07-29 | 2022-11-11 | 重庆大学 | Soft charging circuit and method of power grid side power supply hybrid multi-level converter |
| CN115333211B (en) * | 2022-07-29 | 2024-04-30 | 重庆大学 | Soft charging circuit and method for power grid side power supply hybrid multi-level converter |
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| CN104242625B (en) | 2019-01-04 |
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Denomination of invention: A pre charging device, control device, and control method for a five level inverter Effective date of registration: 20230306 Granted publication date: 20190104 Pledgee: Bank of China Limited by Share Ltd. Xuzhou Copper Mt branch Pledgor: CHINA MINING DRIVES & AUTOMATION Co.,Ltd. Registration number: Y2023320000124 |
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