CN102857136A - Converter for converting high-voltage direct current into alternating current - Google Patents
Converter for converting high-voltage direct current into alternating current Download PDFInfo
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Abstract
The invention discloses a converter for converting high-voltage direct current into alternating current in a high voltage direct current-light (HVDC-Light) system. The converter is characterized by comprising a direct current/direct current (DC/DC) input stage and a direct current/alternating current (DC/AC) inverting stage; the DC/DC input stage consists of a resonant soft switching converter; the secondary stage of a high-frequency transformer in the converter is provided with independent N*3 windings, the output voltage of each winding is subjected to rectification and capacitive energy storage, and N*3 mutually-isolated and equivalent independent direct current power supplies are formed; and the DC/AC inverting stage comprises N*3 power units, each power unit consists of a single-phase full-bridge inverter, the direct current input end of each power unit is connected to an independent direct current power supply, the alternating current output ends of N power units are sequentially connected in series to form an alternating current output phase of the converter, and three phases are connected into a three-phase alternating current output in a star-shaped (also called as Y-shaped) mode.
Description
Technical field
The present invention relates to a kind of topological structure of semiconductor convertor, relate in particular to a kind of being applied in high pressure HVDC Light (HVDC-Light) system, the high voltage direct current electric energy is converted to a kind of high voltage direct current of simple alternating current electric energy to the topological structure of the converter of exchange conversion.
Background technology
The direct current that the conventional high-tension DC transmission system is used is based on the current source type converter of thyristor to the converter of exchange conversion, its switching frequency is power frequency, the current harmonics frequency is low and content is high, needs jumbo filter to limit the current harmonics that injects AC network; And high pressure HVDC Light technology, all-controlling power electronics device, voltage source converter and pulse modulation technique three large characteristics have been given prominence to, has following advantage than the conventional high-tension HVDC Transmission Technology: 1, can realize the independent control of active power and reactive power, need not extra reactive power compensation; 2, can power to passive AC system; 3, it is above and content is low that the harmonic wave in the output waveform is in 1 KHz, and filter is made easily.
According to the characteristics of high pressure HVDC Light technology, be incorporated into the power networks at wind-force and distributed power generation, the field such as asynchronous interconnected, urban power distribution network increase-volume, isolated island and offshore drilling platform power supply of AC system, obtained increasing application.Be accompanied by the fast development of power electronic technology and improving constantly of large power all-controlled type device cost performance, the high pressure HVDC Light is just becoming the developing direction of following HVDC Transmission Technology, even replaces within the specific limits the conventional high-tension direct current transportation.
At present, in the high pressure HVDC light system, the high voltage direct current electric energy is converted to the topological structure of the converter of simple alternating current electric energy, mainly be two level converters shown in Figure 1, with modularization multi-level converter shown in Figure 2, the device for power switching of the two use all is insulated gate bipolar transistor IGBT, or other field controller.
Wherein, there is following deficiency in two level converters shown in Figure 1: 1, be output as two level waveforms of pulse-width modulation, very high voltage time rate of change dv/dt is arranged, need to use filter just can restore sine and involve the voltage time rate of change that suppresses high; 2, present, the switching frequency of IGBT and is operated under the operating state of hard switching between 1 KHz to 3 KHz in the high pressure HVDC light system.The collection of each IGBT that will use for connecting is penetrated (collector electrode, emitter) both end voltage and is limited in the safe scope (be generally its withstand voltage limit value 70% in), each IGBT two ends is parallel with moving static state voltage equipoise absorbing circuit (by its function, also claiming pressure limiting circuit).Under the operating state of the switching frequency of KHz level and hard switching, the designing and making difficulty of pressure limiting circuit is larger, and power consumption is also larger.
For example, in two level converters of prior art, the IGBT that connects in the converter valve realizes under the condition of current power frequency load current instantaneous value by the end of conducting and is conducting to the conversion of cut-off that the cycle mean value of its transition period electric current is Io * 2
/ π, wherein Io is the load current effective value, π is circumference ratio 3.14, within nonsynchronous time of IGBT switch (such as 1 microsecond) of series connection, load current flow precession static state voltage equipoise absorbing circuit, and need to fall at a switch periods internal consumption energy of this inflow, rise to prevent the voltage accumulation.If moving static state voltage equipoise deboost value Vc is 1000 volts, load current Io effective value is 1000 peaces, IGBT switching frequency Fs is 1500 hertz, and the nonsynchronous time T d of IGBT switch is 1 microsecond, then the cycle average loss Pc=Vc of moving static state voltage equipoise absorbing circuit * Io * 2
/ π * Td * Fs=1350 watt.For the product of making in batches, the position of the asynchronous appearance of power switch is at random, so the moving static state voltage equipoise absorbing circuit of each IGBT two ends parallel connection will design by this power consumption.
Modularization multi-level converter shown in Figure 2, need to take measures capacitance voltage among each submodule SM is maintained identical definite value, the safety of the waveform that ability output distortion degree is low and assurance modules, this has greatly increased the design difficulty of control circuit, that technical bottleneck in the practical application is (referring to Chinese version books ISBN978-7-5083-8953-0, " based on the high voltage dc transmission technology of voltage source converter " the 71st page, China Electric Power Publishing House, 2009).
Two level converters shown in Figure 1 and modularization multi-level converter shown in Figure 2, in the needs electrical isolation, perhaps do not mate between input voltage and the output voltage in the situation of (as inputting 100 kilovolts of direct currents, 10 kilovolts of interchanges of output), need to use bulky Industrial Frequency Transformer, could realize level match and obtain preferably device operating mode.
Summary of the invention
The technical problem that the present invention solves is: evade the large problem of control circuit design difficulty in the modularization multi-level converter, the designing and making difficulty that solves the moving static state voltage equipoise absorbing circuit under the hard switching operating state of IGBT in two level converters is large, also larger problem of power consumption simultaneously, adopt ripe technology, the function topology of multiple mature and reliable is carried out new combination, form new converter topological structure, realization is converted to the high voltage direct current electric energy function, the manufacture difficulty of reduction converter and the raising reliability of simple alternating current electric energy.Simultaneously, the present invention also overcomes in the prior art, in unmatched situation between needs electrical isolation or input voltage and the output voltage, needs to use the technical problems such as bulky Industrial Frequency Transformer.
The technical solution used in the present invention is, a kind of high voltage direct current is to the converter of exchange conversion, comprise that DC-to-DC conversion (DC/DC) input stage and direct current are to exchange conversion (DC/AC) inverse cascade, it is characterized in that: described DC/DC input stage is made of resonance type soft switch transducer, high frequency transformer in this converter is secondary independently N * 3 winding, the output voltage of each winding forms N * 3 mutually isolation, an equivalent independent DC power supply altogether all through over commutation and capacitance energy storage; Described DC/AC inverse cascade is made of N * 3 power cell, each power cell is made of single-phase full bridge formula inverter, its direct-flow input end respectively connects a described independent DC power supply, the ac output end of every N power cell is followed in series to form the phase that converter exchanges output, and three-phase connects and composes three-phase alternating current output according to star-like (also claiming the Y type) mode.
The further technical scheme of the first of the present invention is: the resonance type soft switch transducer of described DC/DC input stage, it is LC series resonance-type Zero Current Switch half-bridge converter (or full-bridge converter), comprise: 2 converter valve connect into half-bridge, its output is series resonance inductor, high frequency transformer is elementary, resonant capacitance is connected to high voltage direct current negative terminal (or other 2 converter valve connect into the output of half-bridge) successively, and the high-low voltage end of the half-bridge that described converter valve consists of connects respectively the positive and negative end of high voltage direct current.Each converter valve is comprised of a plurality of power switching device series, and the two ends of each device for power switching are parallel with by RCD(resistance, electric capacity, diode) pressure limiting circuit that consists of, and anti-paralleled diode.The switch periods of converter valve is greater than 2 times of harmonic period.
The annexation of RCD pressure limiting circuit wherein (comprise follow-up mention) and anti-paralleled diode, consistent, described RCD pressure limiting circuit is comprised of discharge resistance R, the temporary capacitor C of energy and clamping diode D, behind wherein said discharge resistance, the temporary Capacitance parallel connection of energy, one end connects the anode of anti-paralleled diode, the other end connects the negative electrode of clamping diode, the negative electrode of the anodic bonding anti-paralleled diode of described clamping diode.
The further technical scheme of the second of the present invention, the resonance type soft switch transducer of described DC/DC input stage, it is LLC series resonance-type Zero-voltage switch half-bridge converter (or full-bridge converter), comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor successively, the high frequency transformer armature winding, resonant capacitance is connected to the negative terminal (or other 2 converter valve connect into the output of half-bridge) of high voltage direct current, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal also comprises the magnetizing inductance of high frequency transformer armature winding equivalence.Each converter valve is comprised of a plurality of power switching device series, the pressure limiting circuit that the two ends of each device for power switching are parallel with Absorption Capacitance, are made of RCD, and anti-paralleled diode.The a little higher than resonance frequency of the switching frequency of converter valve also is that switch periods is shorter than harmonic period.
The third further technical scheme of the present invention, the resonance type soft switch transducer of described DC/DC input stage, it is the LLC series resonance-type Zero-voltage switch half-bridge converter with the resonant capacitance voltage clamp, comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor successively, high frequency transformer is elementary, resonant capacitance is connected to the negative terminal of high voltage direct current, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal, the magnetizing inductance that also comprises the elementary equivalence of high frequency transformer, come adjusting inductance to the size that needs by the length of the used air gap that iron core is opened of high frequency transformer, also comprise 2 clamping diode valves that resonant capacitance voltage carried out clamp, one and resonance Capacitance parallel connection in the wherein said clamping diode valve, its anode tap connects the negative terminal of high voltage direct current, the cathode terminal of another clamping diode valve connects the anode of high voltage direct current, and its anode tap connects the negative electrode of previous clamping diode valve; Described each clamping diode valve is formed by connecting in the same way by a plurality of diodes; Described each converter valve is composed in series by a plurality of device for power switching are equidirectional, the pressure limiting circuit that the two ends of each device for power switching are parallel with Absorption Capacitance, are made of RCD, and anti-paralleled diode.The switching frequency of converter valve approximates resonance frequency.
Further technical scheme of the present invention is: the resonance type soft switch transducer of described DC/DC input stage, resonant inductance wherein are to be made of satiable inductor, the series connection of routine (unsaturated) inductance.
Further technical scheme of the present invention is: the device for power switching in the described converter valve is insulated gate bipolar transistor IGBT, or power field effect pipe POWER MOSFET etc., or gate level turn-off thyristor GTO, or integrated gate commutated thyristor IGCT, or huge transistor GTR.
High voltage direct current provided by the invention is made of DC/DC input stage, DC/AC inverse cascade serial connection to the converter of exchange conversion, its technique effect is: to be operated in soft switch be under no-voltage or the zero current condition to converter valve in the DC/DC input stage, the equal pressure-volume of sound attitude of device for power switching realizes that easily power consumption is lower in the converter valve; Comprise high frequency transformer in the DC/DC input stage, realize electrical isolation and level conversion, do not need extra Industrial Frequency Transformer.The power unit cascade framework is adopted in the output of DC/AC inverse cascade, can adopt the control technologys such as ripe phase-shifting carrier wave modulation or the stacked modulation of carrier wave, realizes easily; The DC/AC inverse cascade is many level outputs, and voltage change ratio is low, good output waveform, and filter capacity is little, and part occasion (such as motor-driven) just can be used without filtering.
Description of drawings
Fig. 1 is the topology diagram of two level converters of one of prior art;
Fig. 2 is the topology diagram of two modularization multi-level converter of prior art;
Fig. 3 (A) is that a kind of high voltage direct current of the embodiment of the invention is to the converter structure figure of exchange conversion;
Fig. 3 (B) is the inside exemplary block diagram of converter valve HLF, power cell PU among Fig. 3 (A);
A kind of LC series resonance-type Zero Current Switch half-bridge converter of Fig. 4 one of DC/DC input stage embodiment that is the described a kind of high voltage direct current of Fig. 3 in the converter of exchange conversion;
Fig. 5 is the oscillogram of main electric weight among Fig. 4;
A kind of LLC series resonance-type Zero-voltage switch half-bridge converter of two of Fig. 6 DC/DC input stage embodiment that is the described a kind of high voltage direct current of Fig. 3 in the converter of exchange conversion;
Fig. 7 is the oscillogram of main electric weight among Fig. 6;
A kind of LLC series resonance-type Zero-voltage switch half-bridge converter with the resonant capacitance voltage clamp of three of Fig. 8 DC/DC input stage embodiment that is the described a kind of high voltage direct current of Fig. 3 in the converter of exchange conversion;
Fig. 9 is in a kind of LC series resonance-type Zero Current Switch half-bridge converter of Fig. 4, and resonant inductance Lr is the oscillogram of the main electric weight when connecting formation by satiable inductor, routine (unsaturated) inductance.
Embodiment
Below in conjunction with specific embodiment, technical solution of the present invention is described further.
(1) a kind of high voltage direct current of the embodiment of the invention is to the converter of exchange conversion.
As shown in Figure 3, embodiments of the invention, a kind of high voltage direct current is to the converter of exchange conversion, comprise: DC-to-DC conversion (DC/DC) input stage and direct current are to exchange conversion (DC/AC) inverse cascade, wherein the DC/DC input stage is made of resonance type soft switch transducer, BYQ-T1 level of high frequency transformer in this converter has independently N * 3 winding, the output voltage of each winding is all through over commutation and capacitance energy storage, form altogether mutually isolation of N * 3, (numbering is from DCA1 for equivalent independent DC power supply, DCA2, to DCAn, from DCB1, DCB2, to DCBn, from DCC1, DCC2, to DCCn, N * 3 altogether); Wherein, the DC/AC inverse cascade is made of N * 3 a power cell PU, each power cell PU is made of single-phase full bridge formula inverter, its direct-flow input end respectively connects a described independent DC power supply, the ac output end of every N power cell is followed in series to form the phase that converter exchanges output, three-phase connects and composes three-phase alternating current output UA according to star-like (also claiming the Y type) mode, UB, UC, independent DC power supply DCA1 wherein, DCA2, to DCAn, power supply is to the power cell of UA phase, independent DC power supply DCB1, DCB2, to DCBn, power supply is to the power cell of UB phase, independent DC power supply DCC1, DCC2, to DCCn, power supply is to the power cell of UC phase.
Above-mentioned high voltage direct current is in the converter of exchange conversion, and what the DC/AC inverse cascade adopted is ripe power unit cascade topological structure.Each power cell is made of single-phase full bridge formula inverter, and the inner device for power switching that uses is not connected, and does not have the technical barrier related with the device series connection; Simultaneously, each power cell adopts independent current source power supply equivalent, isolation, and the natural assurance of cell voltage does not need to take above the inversion control special measure, inversion control can adopt the pulse modulation technologies such as ripe phase-shifting carrier wave modulation or the stacked modulation of carrier wave, realizes simple, easy; The DC/AC inverse cascade is many level outputs, and the output voltage rate of change is low, and waveform approaches sinusoidal wave, and simple filtering just can obtain the sinusoidal waveform of low distortion, and the part occasion even just can not used with filtering, such as motor-driven.Because what use is ripe technology, repeats no more the operation principle of DC/AC inverse cascade here.
Described high voltage direct current comprises high frequency transformer in the DC/DC input stage in the converter of exchange conversion, can realize electrical isolation and level conversion, does not need extra Industrial Frequency Transformer.
Described high voltage direct current is in the converter of exchange conversion, what the DC/DC input stage adopted is the resonant type soft-switch topological structure, in the low tension switch power supply, also generally adopt, but converter valve is made of single device for power switching in the low tension switch power supply, be used for now high pressure HVDC Light occasion, converter valve is comprised of a plurality of power switching device series, and how its moving static state voltage equipoise guarantees, needs special concern.
The core technology difficult problem of power switching device series application is simply described by following elder generation, also is voltage-sharing, comprising: static state voltage equipoise, dynamic voltage balancing.All press by realizing at each device for power switching two ends parallel connection pressure limiting circuit (or claiming moving static state voltage equipoise absorbing circuit), purpose is to guarantee that the both end voltage of each device for power switching is in safety limit, such as its withstand voltage limit value 70% in, this safety limit is also referred to as all presses desired value.
Static state refers to that whole device for power switching of connecting are in conducting and the cut-off state of stable state.When being in the conducting state of stable state, there is not the danger of overvoltage in the device both end voltage within the three ten-day period of hot season.When being in the cut-off state of stable state, device creepage is little in the device for power switching of series connection bears higher voltage, because the little equivalent resistance that means of leakage current is high, higher voltage will be born in high resistance device two ends in the series arm.Because leakage current is very little during the cut-off of general device for power switching, in the milliampere level, as long as the pressure drop that the discharge resistance of milliampere level leakage current in pressure limiting circuit (in parallel with the device for power switching of correspondence) forms is no more than the safety limit of device for power switching, all pressures when just having realized cut-off state, additional power consumption is in a watt level, and Design and implementation does not all have difficulty.Follow-up explanation will repeat no more the static state voltage equipoise problem.
Dynamically refer to the of short duration process of device for power switching generation state conversion, comprising: change the process of cut-off into, changed into the process of conducting by cut-off by conducting.Because the parameter of device for power switching and its control circuit has discreteness, also comprise temperature sensitivity and time variation, the time length of the opening process of device for power switching, turn off process may be inconsistent, can cause the device for power switching that opening process is long, turn off process is short to bear " relatively high voltage ".The task of pressure limiting circuit is the amplitude of restriction aforementioned " relatively high voltage ", guarantees that the both end voltage of each device for power switching is in safety limit.
What be worth particularly pointing out is, the converter valve among the present invention is change over switch state under no-voltage or the zero current condition at soft switch, and the equal pressure-volume of sound attitude of device for power switching easily realizes in the converter valve, and power consumption is lower.
Concrete reason describes in detail in follow-up embodiment.
(2) a kind of LC series resonance-type Zero Current Switch half-bridge converter of one of a kind of high voltage direct current DC/DC input stage embodiment in the converter of exchange conversion.
As shown in Figure 4, the resonance type soft switch transducer of the DC/DC input stage of the described a kind of high voltage direct current of Fig. 3 in the converter of exchange conversion, it is a kind of LC series resonance-type Zero Current Switch half-bridge converter, comprise: the half-bridge that 2 converter valve (HLF-1, HLF-2) connect into, its output O1 negative terminal DC-that series resonance inductor Lr, high frequency transformer BYQ-T1 are elementary successively, resonant capacitance Cr is connected to high voltage direct current, the high-low voltage end of the half-bridge that described converter valve consists of connects respectively the positive and negative end of high voltage direct current.
Each converter valve respectively by a plurality of device for power switching Q1, Q2 ..., Qn is composed in series, each device for power switching two ends is parallel with pressure limiting circuit, and anti-paralleled diode.Be the convenience of narration, take the connected mode of device for power switching Q1 as example explanation and pressure limiting circuit, anti-paralleled diode etc., all the other by that analogy.
For example, the high voltage end of described device for power switching Q1 (such as collector electrode C of insulated gate bipolar transistor IGBT etc.), low-voltage end (such as emitter E of insulated gate bipolar transistor IGBT etc.) connect respectively negative electrode, the anode of anti-paralleled diode D11; After discharge resistance R1 in the described pressure limiting circuit, temporary capacitor C 1 parallel connection of energy, an end connects the anode of anti-paralleled diode D11, and the other end connects the negative electrode of clamping diode D1, the negative electrode of the anodic bonding anti-paralleled diode D11 of clamping diode D1.
The realization of the dynamic voltage balancing of the device for power switching in the converter valve is described below in conjunction with oscillogram.
Fig. 5 is the oscillogram of main electric weight among Fig. 4, consistent (referring to Chinese version books ISBN7-03-007766-0 with the typical waveform of low pressure LC series resonance-type Zero Current Switch half-bridge converter, " soft switch technique of direct-current switch power supply " the 69th page, Science Press, 2000).
As shown in Figure 5, wherein: QD1, QD2 are respectively the control signals of converter valve HLF-1, converter valve HLF-2, and high level represents the controlled conducting of converter valve, and low level represents the controlled cut-off of converter valve; VO1 be output point O1 with respect to the voltage of the negative DC-of high voltage direct current, Vin be high voltage direct current positive and negative between the voltage of (between DC+, the DC-), resonance current iLr is the electric current of resonant inductance Lr, clamp current iD1 is the electric current that flows into pressure limiting circuit.
Harmonic period Tr determines that by resonant inductance Lr, resonant capacitance Cr length is t4-t0, and the switch periods of converter valve surpasses 2 times of harmonic period Tr, realizes Zero Current Switch control.
Be the convenience of narration, suppose that opening process device for power switching long, that turn off process is short all is Q1 among the converter valve HLF-1.For other situation, can contrast understanding, conclusion is identical.
1.t0-t1 the time period
As shown in Figure 5, at moment t0, converter valve HLF-1 conducting under the effect of control signal QD1, high-voltage DC power supply Vin is by elementary, the resonant capacitance Cr of converter valve HLF-1, resonant inductance Lr, high frequency transformer BYQ-T1, form current path, produce resonance current iLr, size rises according to sinusoidal rule from 0 beginning.
Device for power switching Q1 opening process is longer, until t1 just enters complete conducting state constantly.
In t0-t1 time period, not conducting of device for power switching Q1, resonance current iLr will enter voltage limiting circuit, its waveform is shown in clamp current iD1 among Fig. 5, flow through clamping diode D1, the temporary capacitor C 1 of energy, cause capacitor C 1 both end voltage to rise, can select the suitable appearance value of capacitor C 1, make the maximum that rises to still be lower than the safety limit of device for power switching Q1.This section is in the period, and device for power switching Q1 both end voltage is about capacitor C 1 both end voltage (only differing the forward conduction voltage of a clamping diode D1, in the 2V).
Within the remaining time of a switch periods, the temporary capacitor C 1 of energy is by discharge resistance R1 discharge.For preventing the progressively accumulation of capacitor C 1 voltage, the numerical value of choose reasonable resistance R 1 makes capacitor C 1 voltage can return to device for power switching Q1 and opens front numerical value.
Because the current value among the present invention during device for power switching Q1 conducting is smaller, needs temporary energy with consuming also less, effectively reduces the design difficulty of voltage limiting circuit, realizes easily.
Concrete effect describes in detail after the course of work is described.
2.t1--t2 the time period
As shown in Figure 5, t1-t2 is in the time period, and high-voltage DC power supply Vin continues resonance by elementary, the resonant capacitance Cr of converter valve HLF-1, resonant inductance Lr, high frequency transformer BYQ-T1, to t2 constantly, reaches the resonance half period, and resonance current iLr amplitude is 0.
3.t2-t3 the time period
As shown in Figure 5, having spent the resonance half period is that t2 is after the moment, high-voltage DC power supply Vin is by converter valve HLF-1, resonant inductance Lr, high frequency transformer BYQ-T1's is elementary, resonant capacitance Cr, continue resonance, direction occurs and changes in resonance current iLr, increase in the other direction by sinusoidal rule, to the t3 antiparallel diode current flow of each device for power switching among the converter valve HLF-1 constantly, this moment, the switch-off power switching device was zero current, no-voltage is turn-offed, do not produce turn-off power loss, the current value of timing period, magnitude of voltage all is approximately 0, does not have electric current to enter voltage limiting circuit, it is not proposed additional requirement.The problem that does not also have dynamic voltage balancing.
3.t3-t4 the time period
As shown in Figure 5, resonance current iLr continues to keep negative direction, until constantly harmonic period end of t4, resonance current iLr is attributed to 0.
4. t4-t5 time period
As shown in Figure 5, device for power switching all is in cut-off state in the converter valve, is equivalent to aforesaid static state, and relevant issues are explained, and no longer repeats.
To t5 constantly, the converter valve of conducting changes to HLF-2, and the situation when being HLF-1 with aforesaid converter valve is consistent, can contrast understanding.
The conditions such as the two level converter Same Efficieneys output of one of the below's employing and prior art, equivalent device discreteness are estimated the loss of voltage limiting circuit in the present embodiment.
In the prior art, Vin is the voltage of high voltage direct current between positive and negative, also is every peak-to-peak value of exporting mutually sinusoidal voltage, every phase output voltage effective value Vo=Vin/2
, the load current effective value is Io, is 1 to calculate the maximum gross output Po of three-phase=3 * Vo * Io according to power factor.
In the present embodiment, the power output of half-bridge converter is about Vin/2 * Iav, and wherein Iav is the mean value of absolute value between t5-t0 of resonance current iLr, and that presses the power equity concerns 3 * Vo * Io=Vin/2 * Iav, obtains Iav=3 * Io/
If the switch periods of setting converter valve is 2.2 times of harmonic period, time period t 5-t0 is the switch half period, should be 1.1 times of harmonic period t4-t0, is 2.2 times of resonance half period t2-t0, i.e. (t5-t0)=2.2 * (t2-t0).
As shown in Figure 5, consider that the resonance current iLr of half period before the resonance (seeing that t0-t2 is interval among Fig. 5) is large and occupy larger component, the current i D1 of inflow voltage limiting circuit and the resonance current iLr's of t0-t1 time period is consistent, so analyzing-namely suppose the later half cycle iLr of harmonic period by worst situation is 0, all power outputs were transmitted in the front half period of resonance, namely resonance current iLr is approximately the half-wave sine wave, its hemiwave time length is t2-t0, and is consistent at the mean value between the t2-t0 and the mean value Iav between the t5-t0.As seen, in the worst situation, the peak I p of resonance current iLr satisfies following relation: Ip * 2/ π * (t2-t0)=Iav * (t5-t0), find the solution and obtain Ip=Iav * pi/2 * (t5-t0)/(t2-t0)=3 * Io/
* pi/2 * 2.2=7.3 * Io.The average iD1av of clamp current iD1 between t1-t0 approximates 0.5 * Ip * sin(2 * π * (t1-t0)/(t4-t0)).
If the switching frequency Fs of converter valve is 1500 hertz, switch periods is 667 microseconds, and harmonic period is 667/2.2=303 microsecond.If moving static state voltage equipoise desired value Vc is 1000 volts, threephase load electric current I o is 1000 peaces in the prior art topology, the nonsynchronous time T d of IGBT switch is 1 microsecond, then the cycle average loss Pc=Vc of voltage limiting circuit * iD1av * Td * Fs=1000 * 0.5 * 7.3 * 1000 * sin(2 * 3.14 * 1/303) * 1/1000000 * 1500=114 watts.Than 1350 watts of the prior art, the amplitude of its decline is obvious, and loss is not as good as 1/10 of initial value.
As seen, a kind of LC series resonance-type Zero Current Switch half-bridge converter of one of a kind of high voltage direct current of the present invention DC/DC input stage embodiment in the converter of exchange conversion, device for power switching Q1 is smaller by the current value during the transfer lag of conducting, voltage limiting circuit need to be kept in the energy that consumes also less, effectively reduce design difficulty, it is also easy to realize; Device for power switching Q1 is that zero current, no-voltage are turn-offed by the conversion that is conducting to cut-off, does not have electric current to enter voltage limiting circuit, it is not proposed additional requirement.The problem that does not also have dynamic voltage balancing.
(3) a kind of LLC series resonance-type Zero-voltage switch half-bridge converter of two of a kind of high voltage direct current DC/DC input stage embodiment in the converter of exchange conversion.
As shown in Figure 6, the resonance type soft switch transducer of the DC/DC input stage of the described a kind of high voltage direct current of Fig. 3 in the converter of exchange conversion, it is a kind of LLC series resonance-type Zero-voltage switch half-bridge converter, comprise: 2 converter valve (HLF-1, HLF-2) half-bridge that connects into, its output O1 is series resonance inductor Lr successively, high frequency transformer BYQ-T1's is elementary, resonant capacitance Cr is connected to the negative terminal DC-of high voltage direct current, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal also comprises the equivalent magnetizing inductance Lp that high frequency transformer is elementary.
Each converter valve respectively by a plurality of device for power switching Q1, Q2 ..., Qn is composed in series, each device for power switching two ends is parallel with Absorption Capacitance, and anti-paralleled diode, pressure limiting circuit.Be the convenience of narration, take device for power switching Q1 as the example explanation with the connected mode of pressure limiting circuit, anti-paralleled diode, Absorption Capacitance etc., all the other by that analogy.
For example, the high voltage end of aforesaid device for power switching Q1 (such as the collector electrode C of insulated gate bipolar transistor IGBT), low-voltage end (such as the emitter E of insulated gate bipolar transistor IGBT) connect respectively negative electrode, the anode of anti-paralleled diode D11; After discharge resistance R1 in the described pressure limiting circuit, temporary capacitor C 1 parallel connection of energy, an end connects the anode of anti-paralleled diode D11, and the other end connects the negative electrode of clamping diode D1, the negative electrode of the anodic bonding anti-paralleled diode D11 of clamping diode D1.Described Absorption Capacitance C11 is attempted by between the high-low voltage end of device for power switching Q1.
The realization of the dynamic voltage balancing of the device for power switching in the converter valve is described below in conjunction with oscillogram.
Fig. 7 is the oscillogram of main electric weight among Fig. 6, consistent (referring to Chinese version books ISBN7-03-007766-0 with the typical waveform figure of low pressure LLC series resonance-type Zero-voltage switch half-bridge converter, " soft switch technique of direct-current switch power supply " the 74th page, Science Press, 2000).
As shown in Figure 7, wherein: QD1, QD2 are respectively the control signals of converter valve HLF-1, converter valve HLF-2, and high level represents the controlled conducting of converter valve, and low level represents the controlled cut-off of converter valve; VO1 be output point O1 with respect to the voltage of the negative DC-of high voltage direct current, Vin be high voltage direct current positive and negative between the voltage of (between DC+, the DC-), resonance iLr is the electric current of resonant inductance Lr, clamp current iD1 is the total current that enters pressure limiting circuit and Absorption Capacitance.
Harmonic period Tr determines that by resonant inductance Lr, resonant capacitance Cr resonance half period length is t4-t0, and the switch periods of converter valve is slightly shorter than harmonic period Tr, realizes zero voltage switch control.
Be the convenience of narration, suppose that opening process device for power switching long, that turn off process is short all is Q1 among the converter valve HLF-1.For other situation, can contrast understanding, conclusion is identical.
1. t0-t1 time period
As shown in Figure 7, at moment t0, converter valve HLF-1 conducting under the effect of control signal QD1, high-voltage DC power supply Vin is by elementary, the resonant capacitance Cr of converter valve HLF-1, resonant inductance Lr, high frequency transformer BYQ-T1, form current path, produce resonance current iLr, size rises according to sinusoidal rule from 0 beginning.All device for power switching comprise that Q1 is in conduction period, and Absorption Capacitance C11 both end voltage is essentially 0.
At whole switch in the cycle, the device for power switching that consists of converter valve HLF-1 is under zero current, zero voltage condition, finishes from by the end of the state conversion of conducting, does not have clamp current to flow into pressure limiting circuit, and the work of pressure limiting circuit is not had added influence.This situation is illustrating that converter valve HLF-2 is from describing in detail, because the operative scenario of 2 converter valve is consistent when the state of conducting is changed.
To t1 constantly, resonance is near 1/2 cycle, the value of resonance current iLr be less on the occasion of, and be to be in zero process of approaching.
2. t1--t2 time period
As shown in Figure 7, at t1 constantly, converter valve HLF-1 is converted to shutoff by conducting under the effect of control signal QD1, and power device turn-offs successively in the process, until t2 all turn-offs constantly.
According to hypothesis, device for power switching Q1 turn-offs in advance, and resonance current iLr flows into the network of Absorption Capacitance and pressure limiting circuit parallel connection, and waveform is shown in clamp current iD1.Device for power switching Q1 just turn-offs, resonance current iLr flows to first Absorption Capacitance C11, cause its both end voltage to rise, if Absorption Capacitance C11 both end voltage rises to above behind the voltage on the temporary capacitor C 1 of energy, most resonance current iLr will flow in the temporary capacitor C 1 of energy, because the value of capacitor C 1 is much larger than Absorption Capacitance C11, the further rate of climb of deboost.Select the appearance value of suitable Absorption Capacitance C11, the temporary capacitor C 1 of energy, so that the t1--t2 time period, the maximum that Absorption Capacitance C11 both end voltage rises to still is lower than the safety limit of device for power switching Q1.
Within the remaining time of a switch periods, i.e. the time beyond the t1--t2 time period, the temporary capacitor C 1 of energy is by discharge resistance R1 discharge.For preventing the progressively accumulation of capacitor C 1 voltage, the numerical value of choose reasonable resistance R 1 makes capacitor C 1 voltage can return to device for power switching Q1 and turn-offs front numerical value.
Because the current value when device for power switching Q1 turn-offs among the present invention is smaller, need temporary energy with consuming also less, effectively reduce the design difficulty of voltage limiting circuit, realize easily.Concrete computational process and (two) joint are similar, no longer repeat.
This time period, resonance current iLr will take the stored charge of the Absorption Capacitance of device for power switching two ends parallel connection among the converter valve HLF-2 away, until it is zero.To moment t2, converter valve HLF-1 turn-offs fully.
3. t2-t3 time period
As shown in Figure 7, it is constant that resonance current iLr keeps positive direction, the anti-paralleled diode conducting afterflow among the converter valve HLF-2.The device for power switching both end voltage is approximately 0 among the converter valve HLF-2.
4. t3-t4 time period
To t3 constantly, converter valve HLF-2 is open-minded under the effect that drives signal QD2, because device for power switching is conducting under no-voltage, zero current condition among the converter valve HLF-2, does not have the problem of dynamic voltage balancing.
To t4 constantly, enter other half switch periods, situation and t0 are constantly similar, no longer repeat.
As seen, a kind of LLC series resonance-type Zero Current Switch half-bridge converter of one of a kind of high voltage direct current of the present invention DC/DC input stage embodiment in the converter of exchange conversion, the current value of device for power switching Q1 during by the transfer lag that is conducting to cut-off is smaller, voltage limiting circuit need to be kept in the energy that consumes also less, effectively reduce design difficulty, it is also easy to realize; Device for power switching Q1 is open-minded under no-voltage, the zero current condition by the conversion by the end of conducting, does not produce supplementary load loss, voltage limiting circuit is not proposed additional requirement.
(4) a kind of LLC series resonance-type Zero-voltage switch half-bridge converter with the resonant capacitance voltage clamp of three of a kind of high voltage direct current DC/DC input stage embodiment in the converter of exchange conversion.
As shown in Figure 8, the resonance type soft switch transducer of the described DC/DC input stage of Fig. 3, it is a kind of LLC series resonance-type Zero-voltage switch half-bridge converter with the resonant capacitance voltage clamp, comprise: 2 converter valve (HLF-1, HLF-2) half-bridge that connects into, its output O1 is series resonance inductor Lr successively, high frequency transformer BYQ-T1's is elementary, resonant capacitance Cr is connected to the negative terminal DC-of high voltage direct current, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal, the elementary equivalent magnetizing inductance Lp that also comprises high frequency transformer, the first clamping diode valve D21 and the second clamping diode valve D22, described the first clamping diode valve D21 and resonance capacitor C r are in parallel, the negative terminal DC-of anodic bonding high voltage direct current, the negative electrode of described the second clamping diode valve D22 connects the anode DC+ of high voltage direct current, the negative electrode of its anodic bonding the first clamping diode valve D21.Described first, second clamping diode valve is all formed by a plurality of diode series aiding connections.That describes in the inside formation of each converter valve, the course of work and the upper joint (three) is consistent, no longer repeats.
(5) the LC series resonance-type Zero Current Switch half-bridge converter of similar aforesaid (two) joint description, it also can be full-bridge converter, comprise: 2 half-bridges that converter valve connects into, its output successively elementary, the resonant capacitance of series resonance inductor, high frequency transformer is connected to the output of the half-bridge that other 2 converter valve connect into, and the high-low voltage end of the half-bridge that described converter valve consists of connects respectively the positive and negative end of high voltage direct current.That describes in the inside formation of each converter valve, the course of work and (two) joint is consistent.
The LLC series resonance-type Zero-voltage switch half-bridge converter that similar aforesaid (three) joint is described, it also can be full-bridge converter, comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor successively, high frequency transformer is elementary, resonant capacitance is connected to the output of the half-bridge that other 2 converter valve connect into, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal, the magnetizing inductance that also comprises the elementary equivalence of high frequency transformer comes adjusting inductance to the size that needs by the length of the used air gap that iron core is opened of high frequency transformer.That describes in the inside formation of each converter valve, the course of work and (three) joint is consistent.
In the resonance type soft switch transducer of the DC/DC input stage of (six) describing in aforementioned chapters and sections (two) to (five) joint, resonant inductance wherein is to be in series by satiable inductor Lr1, unsaturated inductance L r2.
As shown in Figure 9, in a kind of LC series resonance-type Zero Current Switch half-bridge converter for Fig. 4, resonant inductance Lr is the oscillogram of satiable inductor, the main electric weight the when series connection of unsaturated inductance consists of.
Consistent among Fig. 9 among the implication of each symbol and Fig. 5, difference is: time point ts1, the ts2 that increases newly is respectively satiable inductor Lr1 entered, withdraws from saturation condition under forward current time point, corresponding time point did not mark when electric current was negative sense, because this section period does not inject (in parallel with Q1) pressure limiting circuit generation current, do not increase its power consumption.
Resonance current iLr among comparison diagram 9 and Fig. 5, the oscillogram of clamp current iD1, the amplitude that can find the clamp current iD1 among Fig. 9 will obviously reduce, main cause is near 0 electric current, be that time t0 is between the ts1, resonant inductance (satiable inductor Lr1, unsaturated inductance L r2 is in series) inductance value be Lr1+ Lr2, the several times of Lr2, the rate of climb of the resonance current iLr that it the passes through several times (with respect to resonant inductance only when the unsaturated inductance L r2) that also descend, because at t0 to ts1 in such short time, resonant capacitance Cr both end voltage changes very little, the voltage that acts on the resonant inductance two ends is substantially constant, so the inductance value of the pace of change of resonance current iLr and resonant inductance is inversely proportional to; Until moment ts1, satiable inductor Lr1 enters saturation condition; Constantly the resonant inductance amount only is Lr2 after the ts1, consistent among the rate of climb of resonance current iLr and Fig. 5, and subsequent scenario and above-mentioned chapters and sections (two) are described basically identical, repeat no more.
As seen, resonant inductance is the way that can be in series by pulsactor Lr1, unsaturated inductance L r2, can further reduce near the pace of change of resonance current 0, reduce the energy that flows into the pressure limiting circuit that is connected in parallel on the device for power switching two ends, reduce the energy loss of pressure limiting circuit.
In the resonance type soft switch transducer of the DC/DC input stage of (seven) in aforementioned chapters and sections (two) to (six) joint, describing, device for power switching in the wherein said converter valve is insulated gate bipolar transistor IGBT, or high-power FET POWER MOSFET etc., or gate level turn-off thyristor GTO, or integrated gate commutated thyristor IGCT, huge transistor GTR.
These optional devices all are the full-control type devices, and switching speed is fast than controllable silicon, meet the present invention to the basic demand of device: full control and fast.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a high voltage direct current is to the converter of exchange conversion, it is characterized in that: comprise that DC-to-DC conversion (DC/DC) input stage and direct current are to exchange conversion (DC/AC) inverse cascade, wherein the DC/DC input stage is made of resonance type soft switch transducer, high frequency transformer in this converter is secondary independently N * 3 winding, the output voltage of each winding forms N * 3 mutually isolation, an equivalent independent DC power supply altogether all through over commutation and capacitance energy storage; Wherein the DC/AC inverse cascade comprises N * 3 power cell, each power cell is made of single-phase full bridge formula inverter, its direct-flow input end respectively connects a described independent DC power supply, the ac output end of every N power cell is followed in series to form the phase that converter exchanges output, and three-phase connects and composes three-phase alternating current output according to star-like (also claiming the Y type) mode.
2. a kind of high voltage direct current according to claim 1 is to the converter of exchange conversion, it is characterized in that, the resonance type soft switch transducer of described DC/DC input stage, it is LC series resonance-type Zero Current Switch half-bridge converter, comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor, high frequency transformer is elementary, resonant capacitance is connected to high voltage direct current negative terminal successively, and the high-low voltage end of the half-bridge that described converter valve connects into connects respectively the positive and negative end of high voltage direct current; Described each converter valve comprises a plurality of device for power switching of equidirectional series connection, and at pressure limiting circuit, the anti-paralleled diode of each device for power switching two ends parallel connection; The high voltage end of described device for power switching (such as the collector electrode C of insulated gate bipolar transistor IGBT), low-voltage end (such as the emitter E of insulated gate bipolar transistor IGBT) connect respectively negative electrode, the anode of anti-paralleled diode, described pressure limiting circuit is comprised of discharge resistance, the temporary electric capacity of energy and clamping diode, behind wherein said discharge resistance, the temporary Capacitance parallel connection of energy, one end connects the anode of anti-paralleled diode, the other end connects the negative electrode of clamping diode, the negative electrode of the anodic bonding anti-paralleled diode of described clamping diode; 2 times of the harmonic period that the switch periods of converter valve determines greater than resonant inductance, resonant capacitance are realized the converter valve Zero Current Switch.
3. a kind of high voltage direct current according to claim 1 is to the converter of exchange conversion, it is characterized in that, the resonance type soft switch transducer of described DC/DC input stage, it is LLC series resonance-type Zero-voltage switch half-bridge converter, comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor successively, high frequency transformer is elementary, resonant capacitance is connected to the negative terminal of high voltage direct current, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal, the magnetizing inductance that also comprises the elementary equivalence of high frequency transformer comes adjusting inductance to the size that needs by the length of high frequency transformer air gap that iron core is opened; Described each converter valve comprises a plurality of device for power switching of equidirectional series connection, and at Absorption Capacitance, anti-paralleled diode and the pressure limiting circuit of each device for power switching two ends parallel connection; The high voltage end of described device for power switching (such as the collector electrode C of insulated gate bipolar transistor IGBT), low-voltage end (such as the emitter E of insulated gate bipolar transistor IGBT) connect respectively negative electrode, the anode of anti-paralleled diode, described pressure limiting circuit is comprised of discharge resistance, the temporary electric capacity of energy and clamping diode, behind wherein said discharge resistance, the temporary Capacitance parallel connection of energy, one end connects the anode of anti-paralleled diode, the other end connects the negative electrode of clamping diode, the negative electrode of the anodic bonding anti-paralleled diode of described clamping diode; The switch periods of converter valve is slightly shorter than the harmonic period of resonant inductance, resonant capacitance decision, realizes the converter valve zero voltage switch.
4. a kind of high voltage direct current according to claim 1 is to the converter of exchange conversion, it is characterized in that, the resonance type soft switch transducer of described DC/DC input stage, it is the LLC series resonance-type Zero-voltage switch half-bridge converter with the resonant capacitance voltage clamp, comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor successively, high frequency transformer is elementary, resonant capacitance is connected to the negative terminal of high voltage direct current, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal, the magnetizing inductance that also comprises the elementary equivalence of high frequency transformer, come adjusting inductance to the size that needs by the length of high frequency transformer air gap that iron core is opened, also comprise resonant capacitance voltage is carried out first of clamp, the second clamping diode valve, wherein said the first clamping diode valve and resonance Capacitance parallel connection, the negative terminal of its anodic bonding high voltage direct current, the negative electrode of the second clamping diode valve, anode connects respectively the anode of high voltage direct current, the negative electrode of the first clamping diode valve; Described each diode valve is formed by connecting in the same way by a plurality of diodes; Described each converter valve comprises a plurality of device for power switching of equidirectional series connection, and at Absorption Capacitance, anti-paralleled diode and the pressure limiting circuit of each device for power switching two ends parallel connection; The high voltage end of described device for power switching (such as the collector electrode C of insulated gate bipolar transistor IGBT), low-voltage end (such as the emitter E of insulated gate bipolar transistor IGBT) connect respectively negative electrode, the anode of anti-paralleled diode, described pressure limiting circuit is comprised of discharge resistance, the temporary electric capacity of energy and clamping diode, behind wherein said discharge resistance, the temporary Capacitance parallel connection of energy, one end connects the anode of anti-paralleled diode, the other end connects the negative electrode of clamping diode, the negative electrode of the anodic bonding anti-paralleled diode of described clamping diode; The switch periods of converter valve approximates the harmonic period of resonant inductance, resonant capacitance decision, realizes the converter valve zero voltage switch.
5. a kind of high voltage direct current according to claim 1 is to the converter of exchange conversion, it is characterized in that, the resonance type soft switch transducer of described DC/DC input stage, it is LC series resonance-type Zero Current Switch full-bridge converter, comprise: 2 half-bridges that converter valve connects into, its output successively elementary, the resonant capacitance of series resonance inductor, high frequency transformer is connected to the output of the half-bridge that other 2 converter valve connect into, and the high-low voltage end of the half-bridge that described converter valve consists of connects respectively the positive and negative end of high voltage direct current; Described each converter valve comprises a plurality of device for power switching of equidirectional series connection, and at anti-paralleled diode and the pressure limiting circuit of each device for power switching two ends parallel connection; The high voltage end of described device for power switching (such as the collector electrode C of insulated gate bipolar transistor IGBT), low-voltage end (such as the emitter E of insulated gate bipolar transistor IGBT) connect respectively negative electrode, the anode of anti-paralleled diode, described pressure limiting circuit is comprised of discharge resistance, the temporary electric capacity of energy and clamping diode, behind wherein said discharge resistance, the temporary Capacitance parallel connection of energy, one end connects the anode of anti-paralleled diode, the other end connects the negative electrode of clamping diode, the negative electrode of the anodic bonding anti-paralleled diode of described clamping diode; 2 times of the harmonic period that the switch periods of converter valve determines greater than resonant inductance, resonant capacitance are realized the converter valve Zero Current Switch.
6. a kind of high voltage direct current according to claim 1 is to the converter of exchange conversion, it is characterized in that, the resonance type soft switch transducer of described DC/DC input stage, it is LLC series resonance-type full-bridge converter of zero-voltage switch, comprise: 2 half-bridges that converter valve connects into, its output is series resonance inductor successively, high frequency transformer is elementary, resonant capacitance is connected to the output of the half-bridge that other 2 converter valve connect into, the height of the half-bridge that described converter valve consists of, low-voltage end is just connecting respectively high voltage direct current, negative terminal, the magnetizing inductance that also comprises the elementary equivalence of high frequency transformer comes adjusting inductance to the size that needs by the length of high frequency transformer air gap that iron core is opened; Described each converter valve comprises a plurality of device for power switching of equidirectional series connection, and at Absorption Capacitance, anti-paralleled diode and the pressure limiting circuit of each device for power switching two ends parallel connection; The high voltage end of described device for power switching (such as the collector electrode C of insulated gate bipolar transistor IGBT), low-voltage end (such as the emitter E of insulated gate bipolar transistor IGBT) connect respectively negative electrode, the anode of anti-paralleled diode, described pressure limiting circuit is comprised of discharge resistance, the temporary electric capacity of energy and clamping diode, behind wherein said discharge resistance, the temporary Capacitance parallel connection of energy, one end connects the anode of anti-paralleled diode, the other end connects the negative electrode of clamping diode, the negative electrode of the anodic bonding anti-paralleled diode of described clamping diode; The switch periods of converter valve is slightly shorter than the harmonic period of resonant inductance, resonant capacitance decision, realizes the converter valve zero voltage switch.
According to claim 2 or 3 or 4 or 5 or 6 described a kind of high voltage direct current to the converter of exchange conversion, it is characterized in that, the resonance type soft switch transducer of described DC/DC input stage, resonant inductance wherein are to be made of satiable inductor, the series connection of routine (unsaturated) inductance.
According to claim 2 or 3 or 4 or 5 or 6 or 7 described a kind of high voltage direct current to the converter of exchange conversion, it is characterized in that, the device for power switching that consists of described converter valve is igbt (IGBT), or power field effect pipe (POWER MOSFET), or gate level turn-off thyristor (GTO), or integrated gate commutated thyristor (IGCT), or huge transistor (GTR).
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| CN107453595A (en) * | 2017-08-17 | 2017-12-08 | 国家电网公司 | Series IGBT sync control device based on synchro source technology |
| CN109417348A (en) * | 2016-06-28 | 2019-03-01 | Abb瑞士股份有限公司 | The protection of semiconductor in power converter |
| CN116896285A (en) * | 2023-09-11 | 2023-10-17 | 湖南大学 | Mixed carrier modulation method of multi-level converter |
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| US5757633A (en) * | 1995-12-04 | 1998-05-26 | General Atomics | High efficiency multistep sinewave synthesizer |
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| US5642275A (en) * | 1995-09-14 | 1997-06-24 | Lockheed Martin Energy System, Inc. | Multilevel cascade voltage source inverter with seperate DC sources |
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| CN109417348A (en) * | 2016-06-28 | 2019-03-01 | Abb瑞士股份有限公司 | The protection of semiconductor in power converter |
| CN109417348B (en) * | 2016-06-28 | 2022-03-29 | 日立能源瑞士股份公司 | Protection of semiconductors in power converters |
| CN107453595A (en) * | 2017-08-17 | 2017-12-08 | 国家电网公司 | Series IGBT sync control device based on synchro source technology |
| CN107453595B (en) * | 2017-08-17 | 2019-07-02 | 国家电网公司 | Series IGBT sync control device based on synchro source technology |
| CN116896285A (en) * | 2023-09-11 | 2023-10-17 | 湖南大学 | Mixed carrier modulation method of multi-level converter |
| CN116896285B (en) * | 2023-09-11 | 2023-11-14 | 湖南大学 | Mixed carrier modulation method of multi-level converter |
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