CN104836424A - Energy router with cascaded module voltage automatic balancing circuit - Google Patents
Energy router with cascaded module voltage automatic balancing circuit Download PDFInfo
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- CN104836424A CN104836424A CN201510253119.4A CN201510253119A CN104836424A CN 104836424 A CN104836424 A CN 104836424A CN 201510253119 A CN201510253119 A CN 201510253119A CN 104836424 A CN104836424 A CN 104836424A
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Classifications
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33538—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type
- H02M3/33546—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current
- H02M3/33553—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention discloses an energy router with a cascaded module voltage automatic balancing circuit, belonging to the technical field of power electronic converters. The energy router is formed by a rectifier level, a dual active bridge and an inverter level and comprises three ports which are a high voltage AC port, a low voltage AC port and a low voltage DC port to the outside. N H-bridge rectifier modules are in cascade connection to form the rectifier level, n dual active bridge modules are in cascade connection to form the dual active bridge, and the inverter level is formed by a three-phase H bridge module. Each of the dual active bridge modules is internally provided with a cascade module voltage automatic balancing circuit. According to the energy router, the control of the respective bus voltage balance of each cascade module by a controller can be avoided, the requirements of energy router controller operation sources are reduced, the number of sensors and the collection channels of the controller are reduced at the same time, and when the number of the cascade modules is large, the structure has a large advantage.
Description
Technical field
The invention belongs to converters technical field, particularly relate to a kind of main circuit topology and control method of the energy router for energy the Internet.
Background technology
Along with increasing gradually of the grid-connected electric energy of distributed new, bring a lot of problems and challenge to the various aspects such as stability and economy of traditional electrical network, these problems constrain again a large amount of uses of distributed new conversely.For this reason, use for reference the concept of information interconnected network and router, have scholar to propose to build energy the Internet and energy router to realize in electrical network power flowcontrol more flexibly, and then realize the stability of whole electrical network and the optimization of economy after new-energy grid-connected.In energy the Internet, rely on energy router so a kind of converters device, meet the plug and play of distribution type electric energy, the controlled distribution of electric network swim and the requirement such as electric network security, economy.In traditional electrical network, there are some power electronic equipments can realize the effect of local transformation of electrical energy, as STATCOM STATCOM (Static synchronouscompensator), Static Series Synchronous Compensator SSSC (Static synchronous series compensator) can gain merit and reactive power trend by regulation and control, Dynamic Voltage Regulator DVR (Dynamic voltage regulator) can play dynamic electric voltage restitution, Active Power Filter-APF APF (Active power filter) can play power factor correction, THE UPFC UPFC (Unified power flow controller) can to line voltage distribution, electric current is with meritorious, reactive power trend carries out Comprehensive Control, Unified Power Quality Controller UPQC (Unified power qualityconditioner) can eliminate harmonic voltage in circuit and electric current, improve the quality of power supply.These equipment are the minor betterment and control carried out electric energy under traditional power grid architecture, and energy the Internet rebuilds the network architecture from the angle of entirety, and wherein energy router is the key node realizing its function.
The basic topology of energy router expands on the basis of electric power electric transformer, in order to adapt to the high-tension requirement of electrical network, the basis of electric power electric transformer adopts the technical construction high-voltage alternating port of cascade, modularization or multiplex, some topologys adopt modular multilevel technology at high-pressure side, high voltage direct current port is provided, also provides low-voltage alternating-current, low-voltage direct these two kinds of ports in addition.The energy router of these types can realize utility power quality control, power quick adjustment and switch from net, the function such as multiport transformation of electrical energy and fault current limitation.
Different with the requirement of power according to interface type, the physical circuit form of energy router and control method are also different.In these topologys existing, for adapting to the high-tension requirement of electrical network, in energy router, adopt the method for multiple module-cascade to form the port of high-voltage alternating, low-voltage alternating-current and low-voltage direct three types, its canonical topology as shown in Figure 1, this topology is divided into three grades, is rectification stage, two active bridge and inverse cascade respectively.Wherein 4 IGBT module are (as T
h11, T
h12, T
h13, T
h14) a composition H bridge rectification module, form rectification stage after the cascade of n H bridge rectification module, high-voltage alternating port AN is through inductance L
1after be connected to the T of first H bridge rectification module
h11and T
h12the brachium pontis mid point of composition and the T of last H bridge rectification module
hn3and T
hn4the brachium pontis mid point of composition; H bridge inversion module is (as T
h15, T
h16, T
h17, T
h18) and H bridge rectification module (as T
l11, T
l12, T
l13, T
l14) and the high frequency transformer that connects between these two H bridge modules (as T
1) the two active bridge module of composition one, the two active bridge of composition after n two active bridge module cascade; 6 IGBT module (T
o11, T
o12, T
o13, T
o14, T
o15, T
o16) a composition three-phase H bridge inversion module, this module is inverse cascade; Low-voltage alternating-current port UVW inductance (L after filtering
o1, L
o2, L
o3) and filter capacitor (C
o1, C
o2, C
o3) be connected respectively to the mid point of three brachium pontis of three-phase H bridge inversion module; In rectification stage, n H bridge inversion module of n H bridge rectification module and two active bridge is by high voltage bus electric capacity (C
h1c
hn) connect; N H bridge rectification module of two active bridge is connected in parallel on low-voltage bus bar electric capacity C
lon, this bus capacitor is simultaneously as the input capacitance of inverter side three-phase H bridge inversion module; Low-voltage direct port PN is connected respectively to low pressure positive and negative busbar.In above topology, after the two active bridge module of a H bridge rectification module and and high voltage bus capacitor combination, form a cascade module, n cascade module and a three-phase H bridge inversion module and low-voltage bus bar electric capacity C
lcomposition energy router.
Because the component parameters in cascade module each in reality is not quite identical, the busbar voltage of each cascade module can be caused uneven, degradation or damage can be caused.For this reason, in this topology in order to ensure the high voltage bus voltage U between n cascade module
h1u
hmu
hnbalance needs to carry out closed-loop control, needs to carry out closed-loop control to low-voltage bus bar voltage simultaneously.Along with the lifting of high-voltage alternating port voltage grade and the raising of overall transfer power of energy router, the increasing number of cascade module, when carrying out closed-loop control to the busbar voltage of each cascade module, the number of sensors of needs also can increase, the control of the high voltage bus balance of voltage between cascade module can be made to complicate, take more controller resource.Meanwhile, also have scholar to propose to utilize circuit characteristic to realize the topology of the self balancing solid-state transformer of cascade module voltage, as shown in Figure 2, it consists of its topology: entirely control H bridge inverter unit T for one
hm5t
hm8and bus capacitor C
hm, a full control H bridge rectification unit T
lm1t
lm4and bus capacitor C
l, a set of single-phase full bridge uncontrollable rectifier circuit D
m1, D
m2, D
m3, D
m4and the high frequency transformer T be connected between this three
m, wherein, high frequency transformer T
mthere is an independent winding N on former limit
m1, secondary has upper and lower two independent winding N
m2and N
m3; Former limit winding N
m1with entirely control H bridge inverter unit T
hm5t
hm8connect; Winding N above secondary
m2with entirely control H bridge rectification module T
lm1t
lm4connect; Winding N below secondary
m3with single-phase full bridge uncontrollable rectifier circuit D
m1, D
m2, D
m3, D
m4connect, it exports and top winding N
m2output be connected in parallel on C together
ltwo ends.The benefit done like this is under voltage levels, avoid to each cascade module separately busbar voltage balance control, reduce the requirement to controller calculation resources, reduce the quantity of transducer and the acquisition channel of controller, shortcoming is that the full-bridge uncontrollable rectifier circuit increased can bring certain device loss simultaneously.
Summary of the invention
The object of the invention is the weak point for improving prior art, proposing a kind of energy router of new cascade module voltage automatic balance function.The present invention is on the basis of existing energy router topology, increase cascade voltage automatic balancing circuit, make under high input voltage grade, controller is avoided to control each cascade module busbar voltage balance separately, reduce the requirement to energy router controller calculation resources, reduce the quantity of transducer and the acquisition channel of controller, when the quantity of cascade module is a lot, this structure reveals very large advantage simultaneously.
A kind of energy router with cascade module voltage automatic balancing circuit that the present invention proposes, be applied in single phase power supply system, it is characterized in that, this topology is made up of rectification stage, two active bridge, inverse cascade, externally has high-voltage alternating, low-voltage alternating-current and low-voltage direct three kinds of ports respectively; Wherein 4 IGBT module form a H bridge rectification module, and form rectification stage after the cascade of n H bridge rectification module, this rectification stage is single phase system; High-voltage alternating port is through inductance L
1after be connected to first H bridge rectification module first and second IGBT module composition brachium pontis mid point and last H bridge rectification module third and fourth IGBT module composition brachium pontis mid point; Form a H bridge inversion module by 4 IGBT module and form a H bridge rectification module by 4 IGBT module and the high frequency transformer that is connected between this H bridge inversion module with H bridge rectification module forms a two active bridge module, the two active bridge of composition after n two active bridge module cascade; 6 IGBT module form a three-phase H bridge inversion module, and this module is inverse cascade; Low-voltage alternating-current port after filtering inductance and filter capacitor is connected respectively to the mid point of three brachium pontis of three-phase H bridge inversion module; In rectification stage, n H bridge rectification module is connected by high voltage bus electric capacity with n H bridge inversion module of two active bridge; N H bridge rectification module of two active bridge is connected in parallel on low-voltage bus bar electric capacity, and this bus capacitor is simultaneously as the input capacitance of inverter side three-phase H bridge inversion module; Low-voltage direct port is connected respectively to low pressure positive and negative busbar; It is characterized in that, in each two active bridge module, be provided with cascade module voltage automatic balancing circuit; This cascade module voltage automatic balancing circuit is formed by a single-phase semi-bridge uncontrollable rectifier circuit with at one group of tapped winding of band that high frequency transformer secondary increases, this winding output is connected with the AC of single-phase semi-bridge uncontrollable rectifier circuit, the DC output end of single-phase semi-bridge uncontrollable rectifier circuit is connected in parallel on low-voltage direct bus, jointly forms automatic balancing circuit.
The control method with the energy router of cascade module voltage automatic balancing circuit proposed for the present invention is: to the closed-loop control of the closed-loop control of the low-voltage direct busbar voltage of energy router and the high voltage dc bus voltage to first cascade module in energy router, and utilize phase-shifting carrier wave mode to carry out opened loop control to the high voltage dc bus voltage of remaining cascade module.Wherein, high-voltage alternating port can adopt the cascade multilevel converter structure based on two level or many level block;
Technical characterstic of the present invention and beneficial effect:
The present invention is on the basis of the existing topology of energy router, increase cascade voltage automatic balancing circuit, make under voltage levels, controller is avoided to control cascade module busbar voltage balance separately, adopt opened loop control in controlling simultaneously, the requirement to controller collection and calculation resources can be reduced, reduce the quantity of transducer and the acquisition channel of controller simultaneously.Cascade module voltage automatic balancing circuit in the present invention adopts half-bridge uncontrollable rectifier circuit 2 diodes fewer than full-bridge uncontrollable rectifier circuit, reduces the loss that this partial circuit brings.
Described energy router main circuit topology can be applied in single phase power supply system, also extends to three-phase power supply system.
Adopt the present invention when the quantity of cascade module is a lot, the method embodies very large advantage.
Accompanying drawing explanation
Fig. 1 is existing single-phase energy router main circuit topological structure schematic diagram;
Fig. 2 is existing cascade module voltage automatic balancing circuit structural representation;
Fig. 3 is single-phase energy router main circuit topological structure schematic diagram proposed by the invention;
Fig. 4 is single-phase energy router cascade module voltage automatic balancing circuit structural representation proposed by the invention;
Fig. 5 is the high voltage dc bus voltage control method schematic diagram based on cascade module voltage automatic balancing circuit proposed by the invention;
Fig. 6 is the low-voltage direct busbar voltage control method schematic diagram based on cascade module voltage automatic balancing circuit proposed by the invention;
Fig. 7 is three-phase energy router main circuit topological structure schematic diagram proposed by the invention;
Fig. 8 is the effect contrast figure of cascade module voltage automatic balancing circuit before and after switching proposed by the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The energy router with cascade module voltage automatic balancing circuit proposed by the invention, the topological structure be applied in single phase power supply system is the improvement on Fig. 1 architecture basics, as shown in Figure 3.This topology is made up of rectification stage, two active bridge, inverse cascade, externally has high-voltage alternating, low-voltage alternating-current and low-voltage direct three kinds of ports respectively.Wherein 4 IGBT module are (as T
h11, T
h12, T
h13, T
h14) a composition H bridge rectification module, form rectification stage after the cascade of n H bridge rectification module, this rectification stage is single phase system; High-voltage alternating port AN is through inductance L
1after be connected to the T of first H bridge rectification module
h11and T
h12the brachium pontis mid point of composition and the T of last H bridge rectification module
hn3and T
hn4the brachium pontis mid point of composition; H bridge inversion module is (as T
h15, T
h16, T
h17, T
h18) and H bridge rectification module (as T
l11, T
l12, T
l13, T
l14) and the high frequency transformer that connects between these two H bridge modules (as T
1) the two active bridge module of composition one, the two active bridge of composition after n two active bridge module cascade; 6 IGBT module (T
o11, T
o12, T
o13, T
o14, T
o15, T
o16) a composition three-phase H bridge inversion module, this module is inverse cascade, low-voltage alternating-current port UVW inductance (L after filtering
o1, L
o2, L
o3) and filter capacitor (C
o1, C
o2, C
o3) be connected respectively to the mid point of three brachium pontis of three-phase H bridge inversion module; In rectification stage, n H bridge inversion module of n H bridge rectification module and two active bridge is by high voltage bus electric capacity (C
h1c
hn) connect; N H bridge rectification module of two active bridge is connected in parallel on low-voltage bus bar electric capacity C
lon, this bus capacitor is simultaneously as the input capacitance of inverter side three-phase H bridge inversion module; Low-voltage direct port PN is connected respectively to the both positive and negative polarity of low-voltage bus bar.On the basis of said structure, cascade module voltage automatic balancing circuit is provided with in each two active bridge module, this cascade module voltage automatic balancing circuit is formed by a single-phase semi-bridge uncontrollable rectifier circuit with at one group of tapped winding of band that high frequency transformer secondary increases, this winding exports and is connected with the AC of single-phase semi-bridge uncontrollable rectifier circuit, the DC output end of single-phase semi-bridge uncontrollable rectifier circuit is connected in parallel on low-voltage direct bus, jointly forms automatic balancing circuit.Specifically as shown in Figure 4.Entirely control H bridge inverter unit T for one
hm5t
hm8and bus capacitor C
hm, a full control H bridge rectification unit T
lm1t
lm4and bus capacitor C
l, a set of single-phase semi-bridge uncontrollable rectifier circuit D
m1, D
m2and the high frequency transformer T be connected between this three
m, wherein, high frequency transformer T
mthere is an independent winding N on former limit
m1, secondary has upper and lower two independent winding N
m2and N
m3, wherein below winding N
m3intermediate Gray exports tap; Former limit winding N
m1with entirely control H bridge inverter unit T
hm5t
hm8connecting, is high-frequency ac by high-voltage d. c inverse transform; Winding N above secondary
m2with entirely control H bridge rectification unit T
lm1t
lm4connect, be direct current by the high-frequency ac rectification sensed, pass to low-voltage direct bus, the most power in high frequency transformer rely on this channel transfer; Winding N below secondary
m3with single-phase semi-bridge uncontrollable rectifier circuit D
m1, D
m2connect, it exports and top winding N
m2output be connected in parallel on C together
ltwo ends.
The number n of above-mentioned cascade module is determined by the voltage withstand class of high-pressure side alternating voltage grade with the semiconductor switch device adopted.
Operation principle of the present invention is: as high frequency transformer former limit winding N
m1inductive voltage value higher than winding N below transformer secondary
m3inductive voltage value time, diode D in single-phase semi-bridge uncontrollable rectifier circuit
m1, D
m2conducting, is equivalent to high voltage dc bus voltage U
hmhigher than low-voltage direct busbar voltage U
ltime, single-phase semi-bridge uncontrollable rectifier circuit is started working, the power exceeding other cascade module in certain cascade module is delivered on low-voltage direct bus by the half-bridge uncontrollable rectifier circuit in this module, the ratio that the power difference of the cascade module caused due to each cascade high frequency transformer leakage inductance accounts for gross power is very little, and the power therefore transmitted by this branch road is also very little.The high voltage dc bus voltage of each cascade module keeps proportionate relationship according to identical transformer voltage ratio and low-voltage direct busbar voltage, and when controlling low-voltage direct busbar voltage and fixing, the high voltage dc bus voltage of all cascades is with regard to autobalance.
Cascade module voltage automatic balancing circuit topology in the present invention compared with the topology shown in Fig. 2, the many centre taps of winding that secondary increases, adopt half-bridge not control circuit than full-bridge not few 2 diodes of control circuit, reduce the loss of this partial circuit.
The control method with the energy router of cascade module voltage automatic balancing circuit proposed for the present invention is: carry out closed-loop control to the low-voltage direct busbar voltage of energy router, closed-loop control is carried out to the high voltage dc bus voltage of first cascade module in energy router, and opened loop control is carried out to the high voltage dc bus voltage of all the other cascade module, its duty ratio utilizes the duty ratio of first cascade module to adopt phase-shifting carrier wave mode to obtain.
Fig. 5 is the high voltage dc bus voltage control method based on cascade module voltage automatic balancing circuit proposed by the invention.In Fig. 5,
the high voltage dc bus voltage reference value of first cascaded H-bridges inversion module, U
h1be the high-voltage dc voltage actual measured value of first cascaded H-bridges inversion module, U
sfor high-voltage alternating port phase voltage measured value, I
sfor current on line side measured value,
be the current instruction value of first cascaded H-bridges inversion module, d
1... d
nfor the duty cycle control signal of driving pulse in the former limit n of a high frequency transformer cascaded H-bridges inversion module.
and U
h1through comparison the error signal that obtains after proportional integrator PI with U
sthe phase place obtained through phase-locked loop pll enters multiplier, obtains
this is voltage control outer shroud;
with I
sthrough comparison the error signal that obtains after proportional integrator PI with U
sbe added, obtain the duty cycle control signal d of the driving pulse of first cascaded H-bridges inversion module
1, the duty cycle control signal d of driving pulse in the former limit n of a high frequency transformer cascaded H-bridges inversion module is then obtained through phase-shifting carrier wave sinusoidal pulse width modulation mode (CPS-SPWM)
1... d
n.
Fig. 6 is the low-voltage direct busbar voltage control method based on cascade module voltage automatic balancing circuit proposed by the invention.In Fig. 6,
the reference value of low-voltage direct busbar voltage, U
lfor the measured value of low-voltage direct busbar voltage, D
1... D
nfor the duty cycle control signal of driving pulse in high frequency transformer secondary n cascaded H-bridges rectification module.
for the initial phase shifting angle of high frequency transformer secondary first cascaded H-bridges rectification module
and U
lthrough comparison the error signal that obtains after proportional integrator PI with
be added, obtain the duty cycle control signal D of the driving pulse of first cascaded H-bridges rectification module
1, the duty cycle control signal D of driving pulse in high frequency transformer secondary n cascaded H-bridges rectification module is then obtained through phase-shifting carrier wave sinusoidal pulse width modulation mode (CPS-SPWM)
1... D
n.
Described energy router topology also can expand in three-phase power supply system.
Fig. 7 is the proposed by the invention three-phase energy router main circuit topology be applied in three-phase power supply system.In Fig. 7, described rectification stage and two active bridge are adopted by single phase system and star-likely connect and compose three-phase system on Fig. 3 basis, and other part is identical with Fig. 3.
Fig. 8 is in the serious unbalanced situation of energy router high voltage bus voltage of existing three cascade module, the waveform that after dropping into cascade module voltage automatic balancing circuit of the present invention, energy router three high voltage bus voltage resume balance.The wherein 1 high voltage bus voltage waveform representing first cascade module, the 2 high voltage bus voltage waveforms representing second cascade module, the 3 high voltage bus voltage waveforms representing the 3rd cascade module, before 0.1 second, the busbar voltage of the 3rd module is far above the busbar voltage of the first two module, dropped into cascade module voltage automatic balancing circuit 0.1 second time after, through after a while, the high voltage bus voltage resume balance of three cascade module.
The above, be only the present invention preferably embodiment be not intended to limit, be anyly familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (3)
1. one kind has the energy router of cascade module voltage automatic balancing circuit, be applied in single phase power supply system, it is characterized in that, this energy router is made up of rectification stage, two active bridge, inverse cascade, externally has high-voltage alternating, low-voltage alternating-current and low-voltage direct three kinds of ports respectively; Wherein 4 IGBT module form a H bridge rectification module, and form rectification stage after the cascade of n H bridge rectification module, this rectification stage is single phase system; High-voltage alternating port is through inductance L
1after be connected to first H bridge rectification module first and second IGBT module composition brachium pontis mid point and last H bridge rectification module third and fourth IGBT module composition brachium pontis mid point; Form a H bridge inversion module by 4 IGBT module and form a H bridge rectification module by 4 IGBT module and the high frequency transformer that is connected between this H bridge inversion module with H bridge rectification module forms a two active bridge module, the two active bridge of composition after n two active bridge module cascade; 6 IGBT module form a three-phase H bridge inversion module, and this module is inverse cascade; Low-voltage alternating-current port after filtering inductance and filter capacitor is connected respectively to the mid point of three brachium pontis of three-phase H bridge inversion module; In rectification stage, n H bridge rectification module is connected by high voltage bus electric capacity with n H bridge inversion module of two active bridge; N H bridge rectification module of two active bridge is connected in parallel on low-voltage bus bar electric capacity, and this bus capacitor is simultaneously as the input capacitance of inverter side three-phase H bridge inversion module; Low-voltage direct port is connected respectively to low pressure positive and negative busbar; It is characterized in that, in each two active bridge module, be provided with cascade module voltage automatic balancing circuit;
This cascade module voltage automatic balancing circuit is formed by a single-phase semi-bridge uncontrollable rectifier circuit with at one group of tapped winding of band that high frequency transformer secondary increases, this winding output is connected with the AC of single-phase semi-bridge uncontrollable rectifier circuit, the DC output end of single-phase semi-bridge uncontrollable rectifier circuit is connected in parallel on low-voltage direct bus, jointly forms automatic balancing circuit.
2. energy router as claimed in claim 1, is characterized in that, described cascade voltage automatic balancing circuit is made up of the single-phase semi-bridge uncontrollable rectifier circuit formed with tapped winding and two diodes.
3. energy router as claimed in claim 1, it is characterized in that, described energy router expands in three-phase power supply system; Described rectification stage changes three-phase system into by single phase system, and described rectification stage is that three-phase system adopts that three-phase is star-like is formed by connecting by single phase system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510253119.4A CN104836424A (en) | 2015-05-18 | 2015-05-18 | Energy router with cascaded module voltage automatic balancing circuit |
Applications Claiming Priority (1)
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| CN108270356A (en) * | 2018-01-29 | 2018-07-10 | 浙江大学 | DC distribution network energy router and its control method based on PWM/ diode mixed-rectification structures |
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| CN110829845A (en) * | 2019-09-27 | 2020-02-21 | 西安交通大学 | Power electronic transformer topology with power self-balancing capability and control method thereof |
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| CN113241962A (en) * | 2021-06-07 | 2021-08-10 | 昆明理工大学 | Power electronic transformer based on three-phase four-leg MMC and control method thereof |
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| CN107332443B (en) * | 2017-08-14 | 2019-11-19 | 浙江大学 | A kind of DC solid transformer and its control method |
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| CN109361206B (en) * | 2018-09-28 | 2022-05-10 | 哈尔滨中创电气技术有限公司 | Energy control method of ship medium-voltage power grid structure based on multi-terminal DC-DC converter |
| CN111245200A (en) * | 2018-11-28 | 2020-06-05 | 中电普瑞科技有限公司 | Control method and system for cascaded H-bridge multi-level converter |
| CN111245200B (en) * | 2018-11-28 | 2022-09-06 | 中电普瑞科技有限公司 | Control method and system for cascaded H-bridge multi-level converter |
| CN110247416A (en) * | 2019-06-21 | 2019-09-17 | 浙江大学 | Multiport direct current flexibility multimode switching device based on bifurcated bridge arm structure |
| CN112398308A (en) * | 2019-08-14 | 2021-02-23 | 南京南瑞继保电气有限公司 | Multi-port energy router and control system and control method thereof |
| CN112398308B (en) * | 2019-08-14 | 2022-08-26 | 南京南瑞继保电气有限公司 | Multi-port energy router and control system and control method thereof |
| CN110556833A (en) * | 2019-09-05 | 2019-12-10 | 北京国电光宇机电设备有限公司 | Multi-port microgrid energy router |
| CN110829845A (en) * | 2019-09-27 | 2020-02-21 | 西安交通大学 | Power electronic transformer topology with power self-balancing capability and control method thereof |
| CN113241962A (en) * | 2021-06-07 | 2021-08-10 | 昆明理工大学 | Power electronic transformer based on three-phase four-leg MMC and control method thereof |
| CN113241962B (en) * | 2021-06-07 | 2023-11-28 | 昆明理工大学 | Power electronic transformer based on three-phase four-bridge arm MMC and control method thereof |
| CN114123823A (en) * | 2021-12-06 | 2022-03-01 | 国网山东省电力公司电力科学研究院 | Common high-frequency alternating current bus electric energy router high-frequency oscillation analysis method and system |
| CN114123823B (en) * | 2021-12-06 | 2023-09-22 | 国网山东省电力公司电力科学研究院 | High-frequency oscillation analysis method and system for common high-frequency alternating-current bus electric energy router |
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