CN106953532A - The improvement topology and its implementation of multiple-pulse AC/DC converters in a kind of HVDC and VFD systems - Google Patents
The improvement topology and its implementation of multiple-pulse AC/DC converters in a kind of HVDC and VFD systems Download PDFInfo
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- CN106953532A CN106953532A CN201710269322.XA CN201710269322A CN106953532A CN 106953532 A CN106953532 A CN 106953532A CN 201710269322 A CN201710269322 A CN 201710269322A CN 106953532 A CN106953532 A CN 106953532A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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Abstract
The present invention relates to a kind of improvement topology of multiple-pulse AC/DC converters in HVDC and VFD systems and its implementation, the six pulse rectifier modules that its structure is connected including four three-phase transformers separated, four, the secondary of the three-phase transformer of four separation is respectively connecting to four six pulse rectifier modules；The primary and secondary winding of the three-phase transformer is controlled tap changing winding by power semiconductor and then is obtained variable phase shifting angle and turn ratio with Z-shaped configuration.The present invention is simple in construction, can be reconfigured in its immediate umber of pulse.
Description
Technical field
The present invention relates to multiple-pulse AC/DC converter technologies field, multiple-pulse in particularly a kind of HVDC and VFD systems
The improvement topology and its implementation of AC/DC converters.
Background technology
Nowadays, the reliability of D.C. high voltage transmission (HVDC) and frequency conversion drive (VFD) system, availability and maintainability are
Effectively ensure the key criterion of global power generation needs.In such systems, for bearing that ultra high power AC/DC and DC/AC are changed
Carry change of current converter technology (LCC) and pulsation DC or AC power, but also the efficient and high power provided to AC systems are not only provided
Quality interfaces (for example, power network, motor).
A) the routine multiple-pulse AC/DC rectifiers are technologies earliest and most well-known in HVDC and VFD system industries.It is
Efficiently and reliable, its framework can allow its ongoing operation even in faulty condition.Fig. 9 is to be based on 12 pulse rectifiers
IGCT, also referred to as 12 pulse LCR (load current-change rectifier).It is one by 12 pulse transformers (or phase-shifting transformer)
With the current source converter of the 6 pulse rectifiers composition of two series connection.Between each secondary windings and armature winding of transformer
Deviation angle (δ1=0 and δ2=30 °) it is for obtaining the pulsation DC work(with the current harmonics for reducing voltage ripple and grid side
The key element of rate.However, the structure of 12 pulse transformers can not be such that rectifier is effectively operated under degraded mode.For example,
If being fitted without redundancy transformer, any portion of catastrophe failure of transformer may cause whole system to be closed；Also include superfluous
Remaining transformer will increase the size and cost of commutation system.
B) the problem of modern multiple-pulse AC/DC rectifiers are in order to overcome related to the pulse converter of single thread 12, in many
The connected in series or in parallel of two or more 12 pulse converters has been developed in project.Figure 10 is to be based on connecting in DC sides connecting
The example of 12 pulse rectifiers of two threads or module (12 pulse transformers and rectifier) that connect.With the topology shown in Fig. 9
Structure is on the contrary, in the case where a module breaks down, it can continue to work as the pulse rectifier of individual module 12.By
There is identical power in each part of module, its structure is more suitable for very high-power application.However, it is related to important number
The part of amount, to ensure and the pulse converter part identical output performance of single module 12.This is produced according in DC side
Umber of pulse (i.e. 12 pulses) and assess in the current harmonics component that grid side is propagated.Accordingly, it would be desirable to the pulse of single line 12
The identical filter of the identical size of rectifier.In addition, may relate to and AC systems using filter in high power system
The risk of the electric resonance of (for example, power network, AC motor).
The content of the invention
In view of this, the purpose of the present invention is to propose to a kind of improvement of multiple-pulse AC/DC converters in HVDC and VFD systems
Topology and its implementation, it is simple in construction, after part of module breaks down, it can be weighed in its immediate umber of pulse
New configuration.
The present invention is realized using following scheme：The improvement of multiple-pulse AC/DC converters is opened up in a kind of HVDC and VFD systems
Flutter, specifically include four separation three-phase transformers, four series connection six pulse rectifier modules, it is described four separation three-phase
The secondary of transformer is respectively connecting to four six pulse rectifier modules；The primary and secondary winding of the three-phase transformer
With Z-shaped configuration, and tap changing winding is controlled by power semiconductor and then variable phase shifting angle and turn ratio is obtained.
Further, for the three-phase transformer, by selecting the tap level of each winding to obtain Z-shaped connection, Y
The combination of shape connection, triangle connection or above-mentioned connection.
Further, each winding of the three-phase transformer is constituted by braid coil.
Changed the invention allows for a kind of based on multiple-pulse AC/DC converters in HVDC and VFD systems described above
Enter the implementation method of topology, specifically include following steps：
Step S1：Control the expectation winding of three-phase transformer primary side to connect using semiconductor devices and obtain desired
Angle of phase displacement, the initial period, primary and secondary winding is arranged by zigzag；
Step S2：When part three-phase transformer or six pulse rectifier modules break down, according to remaining transformer
Phase shift angle δ, umber of pulse P determine voltage ratio；
Step S3：P, δ and M are calculated using following formula：
P=6n；
M=Vab/VAB
Wherein, M is voltage ratio, and δ is phase shift angle, and P is voltage UdcIn umber of pulse；N is the rectifier mould being connected in series
The quantity of block, VabWith VABRespectively three-phase transformer is secondary with primary voltage；
Step S4：If umber of pulse is 18, voltage ratio is set to：
Vab/VAB=1/3；
If umber of pulse is 12, voltage ratio is set to：
Vab/VAB=1/2；
Step S5：The voltage ratio calculated according to step S4, configuration transformation is turned on and off by control semiconductor devices
The tap winding of device.
Compared with prior art, the present invention has following beneficial effect：
1st, the present invention is after part of module (transformer or rectifier) breaks down, and converter can be immediate at its
Umber of pulse is reconfigured.
2nd, the present invention is more less expensive than standard topology.
3rd, when the transformer and rectifier using same nominal power, the present invention can bear identical quantity of power.This
Outside, its less current harmonics component that less AC components for DC sides voltage that is added to are provided and propagated in grid side.
Brief description of the drawings
Fig. 1 is the structural representation of the variable phase-shifting transformer of three-phase of 4 separation of the embodiment of the present invention.
Fig. 2 is that the embodiment of the present invention for multi-pulse rectifier conventional topologies typicallys represent figure.
Fig. 3 is the topological example of the accepted standard in high power HVDC or VFD system of the embodiment of the present invention.
Fig. 4 is the topology diagram of the electronics Z/z transformers based on 24 pulse rectifiers of the embodiment of the present invention.
Fig. 5 is the winding and its configuration figure of step change mechanism of the Three-phase electronic Z/z transformers of the embodiment of the present invention.
Fig. 6 changes schematic diagram for the Three-phase electronic Z/z transformer tappings of the embodiment of the present invention.
Fig. 7 is the structure chart of the electronics Z/z transformers (single phase model) of the embodiment of the present invention.
Fig. 8 is N in failure conditions3,kTap-change order truth table figure.
Fig. 9 is the topology diagram of the high-power AC/DC converters of conventional 12 pulses of the embodiment of the present invention.
Figure 10 is the topology diagram of the modern 12 pulse power AC/DC converters of the embodiment of the present invention.
Figure 11 is the flow chart of the transformer tap changer order of the embodiment of the present invention.
Figure 12 is the voltage between lines figure measured in the primary side of transformer of the embodiment of the present invention.
Figure 13 is the power network current schematic diagram under the normal mode of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
As shown in Fig. 1 to 13, a kind of changing for multiple-pulse AC/DC converters in HVDC and VFD systems is present embodiments provided
Enter topology and its implementation.
Wherein, Fig. 1 is the structural representation of the variable phase-shifting transformer of three-phase of 4 separation of the present embodiment, specifically includes four
The three-phase transformer of individual separation, four series connection six pulse rectifier modules, it is described four separation three-phase transformer secondary
It is respectively connecting to four six pulse rectifier modules；The primary and secondary winding of the three-phase transformer with Z-shaped configuration, and
Tap changing winding is controlled by power semiconductor and then variable phase shifting angle and turn ratio is obtained.
In the present embodiment, for the three-phase transformer, by selecting the tap level of each winding to obtain Z-shaped company
Connect, Y shape is connected, triangle is connected or the combination of above-mentioned connection.
In the present embodiment, each winding of the three-phase transformer is constituted by braid coil.
The present embodiment also proposed a kind of based on multiple-pulse AC/DC converters in HVDC and VFD systems described above
The implementation method of topology is improved, following steps are specifically included：
Step S1：Control the expectation winding of three-phase transformer primary side to connect using semiconductor devices and obtain desired
Angle of phase displacement, the initial period, primary and secondary winding is arranged by zigzag；
Step S2：When part three-phase transformer or six pulse rectifier modules break down, according to remaining transformer
Phase shift angle δ, umber of pulse P determine voltage ratio；
Step S3：P, δ and M are calculated using following formula：
P=6n；
M=Vab/VAB
Wherein, M is voltage ratio, and δ is phase shift angle, and P is voltage UdcIn umber of pulse；N is the rectifier mould being connected in series
The quantity of block, VabWith VABRespectively three-phase transformer is secondary with primary voltage；
Step S4：If umber of pulse is 18, voltage ratio is set to：
Vab/VAB=1/3；
If umber of pulse is 12, voltage ratio is set to：
Vab/VAB=1/2；
Step S5：The voltage ratio calculated according to step S4, configuration transformation is turned on and off by control semiconductor devices
The tap winding of device.
More specifically the present embodiment is illustrated below in conjunction with the accompanying drawings.
As shown in Fig. 2 Fig. 2 is typicallying represent for multi-pulse rectifier conventional topologies.The pulse rectifier module of part 6 is provided
Voltage source be constant in amplitude and phase angle.The source-series connections of DC, to meet high power level.These power supplys are isolation
, and pulse P quantity needs angle of phase displacement (between the AC sources of part).Then it is real when (2) and (3) when using relational expression (1)
Existing multiple-pulse conversion.In equation (1), UdcIt is the total D/C voltage obtained from the portion voltage after rectification, and equation (2) is AC sources
Between angle of phase displacement δ；(3) it is D/C voltage UdcIn umber of pulse, n is the quantity for the rectifier being connected in series.
Udc=udc1+udc2+udc3...+udcn (1)
P=6n (3)
In the present embodiment, Fig. 3 is the example of the accepted standard topology in high power HVDC or VFD system.It is one
Individual 24 pulse rectifier, including phase-shifting transformer (also referred to as 24 pulse transformers) and four 6 pulse rectifiers being connected in series
Module, it is associated with the by-pass switch of insertion, to be worked under degraded mode.In order that system is reliable, multi-pulse rectifier
It can be allowed in part of module and occur any failure.With reference to Fig. 2 and equation (1), the operation can use the topology in Fig. 3 to be
Feasible.Unfortunately, because 24 pulse transformer angle of phase displacements are all constant, and be only dependent upon the three-phase in primary side around
One of group (Fig. 3), so always not considering equation (2) and (3) in degraded mode.
If, can this thing happens for example, Fig. 2 is reduced to 4 rectifiers being connected in series by 4 AC powers.
For equation (2) and (3), we obtain δ=15 ° and P=24 under normal operation.If δ be designed to it is constant, by
In under the fault condition of partial fault rectifier module, δ will be equal to δ=15 °, and number of pulses can not be equal to P=18.
In the present embodiment, from Fig. 3, it is considered to k1x(1,2,3.4)And ky2(1,2,3,4)As with each part of module M(1,2,3,4)Phase
Two complementary switch of association.If only one of which module failure, k1x=0 and ky2=1.Remaining module can work on,
But lower power consumption.By only considering equation (1), it appears that remaining system is operated by 18 pulse rectifiers, but situation is not this
Sample.As shown in figure 3, if armature winding is configured to star, equation (2) confession under directions answers two continuous AC sources of remaining rectifier module
Between angle of phase displacement be necessarily equal to 20 °.However, 24 pulse transformer angle of phase displacements be designed as it is constant, equal to 15 °.Therefore, no matter
Which part of transformer is faulty, and remaining system all cannot function as the work of 18 pulse rectifiers；It can be only as 12 pulses
Or 6 pulse rectifier work.
In the present embodiment, in the present embodiment, variable three-phase phase shifting transformer is referred to as electronics Z/z transformers, because
It can be changed for their phase shifting angle and conversion turn ratio by the related electrical interface of the tap change to each winding.
Such as Fig. 4, the topology that the present embodiment improves the reliability of 24 pulse AC/DC converters simultaneously can also be as a frequency converter slightly
Used after modification.It is corresponding by providing based on the 6 pulse rectifier modules being connected in series provided by electronics Z/z transformers
Angle of phase displacement can be operated under degraded mode.The topology proposed uses the three-phase transformer of four separation, wherein just
Level and secondary windings are initially configured in zigzag form, and including can by the power semiconductor that configures in some way come
The tap changing winding of control obtains variable phase shift angle and turn ratio.
In the present embodiment, standard topology is based on single 24 pulse transformer, and secondarily level side, which is produced, has constant phase shift
Angle and 12 phase voltages of turn ratio.For example, when using proposed topology, will control residue if a module failure
Transformer phase shifting angle to produce corresponding angle and turn ratio, so that (or not) phase is operated and maintained as 18 pulse rectifiers
Same quantity of power.These angles are respectively δ1=-20 °, δ2=0 and δ3=+20 ° and turn ratio can be held equal to normal mode
1/4 in formula, or 1/3 can be increased to, to compensate due to power reduction caused by malfunctioning module.
In the present embodiment, Fig. 5,6 show the winding of electronics Z/z transformers and its configuration of step change mechanism.Just
Level and secondary windings are by Nk(1,2,3,4)Winding is constituted.N1And N2It is the winding positioned at primary side, and N3And N4It is to be located at primary side
Winding, as shown in Figure 5.Initially, primary and secondary winding is Z-shaped connection (Z/z).By knowing that Z/z connections are Y shape and triangle
The combination of connection, can obtain one of which by properly selecting the tap level of each winding.If for example, N2
=0 and N3=0, then obtain the transformer connected in Y shape (Y/y) form.Similarly, if N2=0 and N4=0, we obtain with
The transformer of star-delta (Y/d) configuration.Therefore, the present embodiment can use Z/z connections distinct model export it is all can
Can put substantially about assembling, as shown in Figure 5.
In the present embodiment, as shown in fig. 6, each winding N in Figure 5k(1,2,3,4)It is made up of k.n braid coil.
Winding change principle is to make cursor k steppings from k.n to k.0 (or in the opposite direction).As winding N1-N2Or N3-N4Tap light
When being marked between k.0≤k≤k.n, winding is connected in zigzag form.When cursor be located at k.0 identical position when, they
Configured in triangle or Y-connection.The Discrete Change of angle of phase displacement and umber of turn ratio is used to be defined in normal or degraded mode
N1, N2, N3And N4Right value.By knowing that voltage ratio M and phase shift angle δ can obtain the number of turn in any pattern, wherein
M=Vab/VAB.Calculate the umber of turn ratio of each mode of operation.Any mould can be obtained by understanding voltage ratio M and angle of phase displacement δ
The number of turn of formula.It is used as design example, it is considered to 18 pulse rectifiers；M=3, system has 03 6 impulse commutation module, Ran Houxuan
03 electronics Z/z transformer is selected, with following angle of phase displacement：δ1=-20 °, δ2=0 and δ3=+20 °.If we consider that Z/z around
Assemble and be set to Y/z1, Y/y and Y/z2, the equation of the turn ratio contributed under regulation each case respectively in equation (4), (5) and
(6) provided in.
Wherein, N2=N4=0 (4)
Wherein, N2=0 (6)
In the present embodiment, Fig. 7 shows the method for realizing electronics Z/z transformers.This idea comes from one kind
The technology of transformer tap changer referred to as in HVDC and VFD systems, for controlling pulse dc power to prevent power source change
Or in serious transient phenomenon.As it was previously stated, the present embodiment uses semiconductor devices (can bi-directionally or uni-directionally switch).Switch
Group (T1,Tp1) and (T2,Tp2) be used to control the expectation winding of primary side to connect, and T31,T13...T3n,T1nAnd T41,T14...T4n,
T14For obtaining desired angle of phase displacement.For example, in primary side, working as T2,Tp1Close and T1,Tp2During disconnection, Y shape connection is obtained
(N2=0).Work as T2,Tp1Disconnect and T1,Tp2During closure, triangle connection (N is obtained1=0).For secondary windings, it is considered to N3By
The situation of 5 tap winding compositions, N3,1Corresponding to minimum value, N3,kCorresponding to peak.
The number of windings between two taps：
N3,(k,k-1)=N3,k-N3,k-1 (7)
Corresponding value between tap 0 and k：
N3,(0,k)=N3,k-1+(N3,k-N3,k-1) (8)
T3,kAnd Tp3,kIt is and N3The associated switch of tap winding.In failure conditions, as the N3 for considering there are 5 taps
During winding, N3,kTap-change order truth table, as shown in Figure 8.
In the present embodiment, as shown in figure 11, when some transformers or 6 pulse rectifier modules break down, first
Determine the quantity of malfunctioning module.This contributes to by determining that umber of pulse P and remaining transformer phase shifting angle δ will select to predict
Optimum operation.Determine whether power keeps constant.It is manageable most that this depends on each remaining transformer and rectifier
It is high-power.It may decide that holding and normal mode identical power.This means increase voltage ratio is (for example, Vab/VAB=1/3,
If umber of pulse is 18 pulses or Vab/VAB=1/2, if 12 pulses).It can also determine to reduce power.It means that right
In all possible degraded mode, V is keptab/VAB=1/4.
In the present embodiment, in P, after δ and M are known, the tap winding of remaining transformer is configured, then use with it is attached
The decoding function of all related powers switch similar Fig. 8 produces switching signal, so as in time of each electronics Z/z transformers
Level side turns on and off corresponding switch.
Figure 12 is the voltage between lines figure that the present embodiment is measured in the primary side of transformer, and Figure 13 is the present embodiment normal mode
Under power network current schematic diagram.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with
Modification, should all belong to the covering scope of the present invention.
Claims (4)
1. the improvement topology of multiple-pulse AC/DC converters in a kind of HVDC and VFD systems, it is characterised in that：Including four separation
Three-phase transformer, four series connection six pulse rectifier modules, it is described four separation three-phase transformer secondary connect respectively
It is connected to four six pulse rectifier modules；The primary and secondary winding of the three-phase transformer passes through work(with Z-shaped configuration
Rate semiconductor devices controls tap changing winding and then obtains variable phase shifting angle and turn ratio.
2. the improvement topology of multiple-pulse AC/DC converters in a kind of HVDC and VFD systems according to claim 1, it is special
Levy and be：For the three-phase transformer, Z-shaped connection, Y shape connection, three are obtained by selecting the tap level of each winding
Angle connection or the combination of above-mentioned connection.
3. the improvement topology of multiple-pulse AC/DC converters in a kind of HVDC and VFD systems according to claim 1, it is special
Levy and be：Each winding of the three-phase transformer is constituted by braid coil.
4. the realization of the improvement topology of multiple-pulse AC/DC converters in a kind of HVDC and VFD systems based on described in claim 1
Method, it is characterised in that：Comprise the following steps：
Step S1：The expectation winding for controlling three-phase transformer primary side using semiconductor devices connects and obtained desired phase shift
Angle, the initial period, primary and secondary winding is arranged by zigzag；
Step S2：When part three-phase transformer or six pulse rectifier modules break down, according to the phase of remaining transformer
Move angle δ, umber of pulse P and determine voltage ratio；
Step S3：P, δ and M are calculated using following formula：
P=6n；
M=Vab/VAB
Wherein, M is voltage ratio, and δ is phase shift angle, and P is voltage UdcIn umber of pulse；N is the rectifier module being connected in series
Quantity, VabWith VABRespectively three-phase transformer is secondary with primary voltage；
Step S4：If umber of pulse is 18, voltage ratio is set to：
Vab/VAB=1/3；
If umber of pulse is 12, voltage ratio is set to：
Vab/VAB=1/2；
Step S5：The voltage ratio calculated according to step S4, transformer is configured by controlling turning on and off for semiconductor devices
Tap winding.
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| CN108448905A (en) * | 2018-04-08 | 2018-08-24 | 福州大学 | A kind of multi-tap phase-shifting transformer for cascade multilevel inverter |
| CN113193777A (en) * | 2021-03-18 | 2021-07-30 | 中国人民解放军海军工程大学 | Twelve-phase three-level H-bridge direct-current side cascade propulsion frequency converter and capacitor voltage balance control method |
| CN113851990A (en) * | 2021-08-11 | 2021-12-28 | 浙江大有实业有限公司带电作业分公司 | Method for replacing box-type transformer with low-voltage side completely uninterrupted |
| CN115776225A (en) * | 2023-02-09 | 2023-03-10 | 国网湖北省电力有限公司经济技术研究院 | Redundant fault-tolerant control method for power electronic transformer |
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| CN108448905A (en) * | 2018-04-08 | 2018-08-24 | 福州大学 | A kind of multi-tap phase-shifting transformer for cascade multilevel inverter |
| CN113193777A (en) * | 2021-03-18 | 2021-07-30 | 中国人民解放军海军工程大学 | Twelve-phase three-level H-bridge direct-current side cascade propulsion frequency converter and capacitor voltage balance control method |
| CN113193777B (en) * | 2021-03-18 | 2022-12-06 | 中国人民解放军海军工程大学 | Twelve-phase three-level H-bridge direct-current side cascade propulsion frequency converter and capacitor voltage balance control method |
| CN113851990A (en) * | 2021-08-11 | 2021-12-28 | 浙江大有实业有限公司带电作业分公司 | Method for replacing box-type transformer with low-voltage side completely uninterrupted |
| CN115776225A (en) * | 2023-02-09 | 2023-03-10 | 国网湖北省电力有限公司经济技术研究院 | Redundant fault-tolerant control method for power electronic transformer |
| CN115776225B (en) * | 2023-02-09 | 2023-05-12 | 国网湖北省电力有限公司经济技术研究院 | Redundant fault-tolerant control method for power electronic transformer |
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