CN204031006U - A kind of power model group of three-phase power electronic transformer - Google Patents
A kind of power model group of three-phase power electronic transformer Download PDFInfo
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Abstract
The utility model provides a kind of power model group of three-phase power electronic transformer, and this three-phase power electronic transformer comprises hv filtering device, described power model group, the 5th power model and low voltage filter; Described power model group comprises the power model unit in high-pressure side series connection and low-pressure side parallel connection respectively; Power model unit comprises the first power model, high-pressure side capacitor, the second power model, medium/high frequency power transformer and the 3rd power model that connect successively, the 3rd power model low-voltage side capacitor in parallel, this electric power electric transformer has the function of three-phase electric energy automatic mutual balance concurrently, can tackle preferably the asymmetric load of low-pressure side, the asymmetric of low-pressure side is transformed into on high-tension side symmetry naturally by topological connection.
Description
Technical field
The utility model relates to a kind of device of electric power electric transformer technical field, specifically relates to a kind of power model group of three-phase power electronic transformer.
Background technology
The proposition of " initiatively power distribution network " concept and constantly practice can solve distributed generation technology and develop and accelerate to apply brought series of technical rapidly.Initiatively power distribution network is intended to improve active distribution capability and the economic operation level of power distribution network to energy, the regenerative resource of actively dissolving, promote distribution network reliability and quality of power supply level, can make power distribution network more efficiently, more move to environmental protection, require higher to the controllability of power distribution network simultaneously.
Distribution transformer is as the basic composition equipment of power distribution network, and its operational reliability, technical performance and economic index can directly affect power supply reliability, the quality of power supply and the intelligent degree of power distribution network.Traditional distribution transformer adopts iron core oil-immersed type or dry type conventionally, and outstanding advantages is that good reliability, efficiency are high, cheap.But in the face of under the background of a series of new challenges, as the power transformer of the most basic power transmission and transformation device of electric power system, the following deficiency that function singleness shows is more and more obvious in electric power system:
1, volume, weight are large, transformer insulation oil contaminated environment;
2, no-load loss is higher, and when load, output voltage is with load fluctuation;
3, when load-side breaks down, can not isolated fault, will involve mains side;
4,, while being with nonlinear load, distortion current, by the transformer coupled electrical network that enters, can pollute electrical network;
5, when mains side voltage is interfered, can be delivered to again load side, cause the impact on sensitive load;
6, need relevant corollary equipment it is detected and protect;
7, ferromagnetic element is non-linear, causes larger magnetizing inrush current while dropping into electrical network, and iron core magnetic produces harmonic pollution when full, causes line voltage and current distortion, and vibration and noise increase.
Electric power electric transformer (PET) refers to the novel electric power transformer that adopts power electronics converter and medium/high frequency power transformer to realize, it also can have the functions such as Waveform Control, trend control and quality of power supply control in completing the functions such as conventional transformer transformation, isolation and energy transmission.Electric power electric transformer can be used as seamless interfacing and the dynamic control point of power transmission network and power distribution network, play the function of similar energy router, the trend of power distribution network is realized to flexible control, dynamic passive compensation and failure current limit, improve the receiving ability of regenerative resource, reduce via net loss, improve the quality of power supply.Electric power electric transformer has the following advantages:
1, volume is little, lightweight, and air natural is cooling, and environmental pollution is little, is more suitable for applying in city than traditional transformer;
2, can export direct current and alternating current simultaneously, meet better the various demand of user;
3, there is DC link, can access very easily the regenerative resource such as photovoltaic, wind-force and energy storage device, improve utilance and the power supply reliability of regenerative resource;
4, there is the controllability of height, can realize constant frequency, constant voltage output, effectively solve and have a large amount of distributed power generations (DG) to connect transformer primary side and secondary side power factor is adjustable, can regulate smoothly, rapidly that power distribution network is meritorious, reactive power flow, during to stable state and fault, power-balance demand compensates fast, is conducive to promote active distribution capability and the economic operation level of power distribution network to energy;
5, have the function of circuit breaker concurrently, large electricity when interrupting system fault that device for high-power power electronic can be instantaneous (delicate level)
6, there is intelligent function, not only can realize detection certainly, self diagnosis, self-shield and the self-recovering function of self, can also realize connected network communication, with the interaction of power distribution network miscellaneous equipment;
7, can realize flexibly phase conversion and Phase-Sequence Transformation.
From structure, electric power electric transformer mainly comprises two fundamentals: power electronics converter and medium/high frequency power transformer.Power electronics converter mainly comprises power electronic device, controller, filter and auxiliary equipment, mainly realizes Waveform Control function.The function of medium/high frequency power transformer is isolation and electric pressure conversion, frequency is usually operated at KHz (kHz) rank, the object that adopts medium/high frequency is mainly significantly to dwindle the volume of transformer, weight reduction, reduces heat radiation and raising capacity and efficiency etc.
The specific implementation of electric power electric transformer is divided two kinds of forms:
1, as shown in fig. 1, without the electric power electric transformer of DC link, also referred to as direct AC/AC type electric power electric transformer, electric power electric transformer is high-frequency ac by the industrial frequency AC of input in primary side Direct Transform, be coupled to after secondary side through medium/high frequency power transformer, direct-reduction becomes industrial frequency AC.In this conversion process, the modulation of primary side and the demodulation of secondary side must be synchronous.There is the features such as transform part is few, simple in structure without the electric power electric transformer of DC link, can reduce greatly the volume and weight of transformer, and can realize easily the control to transformer output voltage amplitude.Weak point is that controllability is not strong, be sometimes difficult to the improvement of the quality of power supply to contribute, and primary side power factor is non-adjustable.
2, as shown in Figure 2, containing the electric power electric transformer of DC link, also referred to as AC/DC/AC type electric power electric transformer, the industrial frequency AC of input is transformed into direct current through rectifier, modulate after becoming high frequency square wave and be loaded on medium/high frequency power transformer first side winding by inverter circuit again, and be coupled to the secondary side winding of medium/high frequency power transformer, subsequently, high frequency square wave is rectified into direct voltage, and another mistake becomes needed interchange output.But in general, its controllability is stronger, can ensure that transformer first and second side all has the good quality of power supply, but conversion process relative complex, required device number is also more.
Electric power electric transformer containing DC link is greatly strengthened than the controllability of the electric power electric transformer without DC link, pulse modulation technology (PWM) can be realized the flexible control of transformer high-voltage, low-pressure side voltage, electric current and power, progressively becomes electric power electric transformer main developing direction from now on.
Granted publication number is in a kind of novel electric power electric transformer in the open hurdle of the patent of invention of CN 101707443 B, proposes to obtain a shared high voltage direct current by multiple MMC brachium pontis are in parallel, and then with after DC capacitor series connection dividing potential drop, the method for conversion successively.Although the shared high voltage direct current of multiple MMC brachium pontis really can be with solving asymmetry problem.But because the voltage of the access direct current systems such as the regenerative resource such as photovoltaic, wind-force and energy storage device is conventionally lower, and DC voltage value is not necessarily equal, needs multiple low-voltage directs, instead of a high voltage direct current.Therefore, multiple MMC brachium pontis share this advantage of the high voltage direct current producing and can not give full play of, and the relatively many shortcomings of the power electronic device number that this scheme adopts and capacitor number of units are not offset effectively.
Therefore need the power model group that proposes a kind of new three-phase power electronic transformer to solve the problems referred to above that prior art exists.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the utility model provides a kind of power model group of three-phase power electronic transformer.
Realizing the solution that above-mentioned purpose adopts is:
A power model group for three-phase power electronic transformer, described three-phase power electronic transformer comprises hv filtering device, described power model group, the 5th power model and low voltage filter; Its improvements are:
Described power model group comprises the power model unit in high-pressure side series connection and low-pressure side parallel connection respectively;
Described power model unit comprises the first power model, high-pressure side capacitor, the second power model, medium/high frequency power transformer and the 3rd power model that connect successively, described the 3rd power model low-voltage side capacitor in parallel;
Described the first power model is for being transformed into direct current by industrial-frequency alternating current; Described high-pressure side capacitor is used for providing direct voltage to support and power storage; Described the second power model is for being transformed into medium/high frequency alternating current by direct current; Described medium/high frequency power transformer is for electric pressure conversion and electrical isolation between high-pressure side and low-pressure side; Described the 3rd power model is for being transformed into direct current by medium/high frequency alternating current; Described low-voltage side capacitor is used for providing direct voltage to support and power storage;
Described the first power model, the second power model and the 3rd power model all adopt H bridge main circuit topology.
Further, described the 3rd power model comprises the power model of a power model or three same capabilities.
Further, in the time that described the 3rd power model comprises a power model, described medium/high frequency power transformer employing 1 turns the transformer of 1 structure; Described power model unit is the power model unit of M structure.
Further, in the time that described the 3rd power model comprises the power model of three same capabilities, described medium/high frequency power transformer employing 1 turns the transformer of 3 structures; Described power model unit is the power model unit of M/3 structure.
Further, when described the second power model for same capability, the 3rd power model comprises the power model that a capacity is L or comprises the power model that three capacity are 1/3L.
Further, the compound mode of described power model group requires to determine according to the output of the withstand voltage level of high-pressure side rated voltage, described the first power model and power model group;
Can provide corresponding power according to the number of described power model unit, meet different output power requirement.
Further, if when the AC serial number of described the first power model is 3n, every power model cell formation power model group that adopts mutually 3n M structure, the overall number of reduction power model and corresponding cost, n is positive integer.
Further, if when the AC serial number of described the first power model is 3n+1, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 1 M/3 structure of adopting mutually, the overall number and the corresponding cost that reduce power model, n is positive integer.
Further, if when the AC serial number of described the first power model is 3n+2, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 2 M/3 structures of adopting mutually, to reduce overall number and the corresponding cost of power model, n is positive integer.
Further, if the AC serial number of described the first power model is 3n+1 or 3n+2, and while having direct current output to require, every respective combination that adopts mutually the power model unit of M structure and the power model unit of M/3 structure forms corresponding power module group to meet corresponding direct current output, adopt the respective combination of the power model unit of M structure and the power model unit of M/3 structure to form corresponding power module group to meet the corresponding output that exchanges simultaneously, to reduce overall number and the corresponding cost of power model, n is positive integer.
Further, described the first power model, the second power model and the 3rd power model are all realized the two-way flow of guaranteeing power in the time of AC-DC conversion;
Four brachium pontis of described H bridge main circuit topology comprise respectively anti-paralleled diode in parallel and can turn-off power electronic device;
The described power electronic device of turn-offing comprises IGBT, IEGT, GTO, IGCT and BIGT.
Further, under the prerequisite of not required power two-way flow, the brachium pontis of the H bridge main circuit topological structure that described the 3rd power model adopts adopts respectively rectifier diode, simplifies and controls, and reduces number of devices and cost.
Further, the high-voltage alternating side of described power model group is connected with electrical network through described hv filtering device, adopts between phase and phase triangle to connect or Y-connection.
Further, the low-pressure side parallel connection of described power model group, forms the DC source of three tunnels and above each self-isolation, meets different engineering demands.
Further, the DC source of described three tunnels and above each self-isolation, can carry out direct current and convert industrial frequency AC to, provides industrial frequency AC through low voltage filter.
Further, the described industrial frequency AC on Mei San road, can adopt star-star connection and delta connection, and three-phase alternating current interface is provided.
Further, described star-star connection can be drawn neutral point, realizes three-phase four-wire system.
Further, in the middle of described medium/high frequency power transformer, can not draw tap, also can draw tap; Described in while drawing tap, the both sides power model of medium/high frequency power transformer and corresponding capacitor wiring should have corresponding adjustment.
Compared with prior art, the utlity model has following beneficial effect:
1, three-phase power electronic transformer of the present utility model can be realized the basic functions such as the voltage transformation, electrical isolation, energy transmission of conventional electric power transformer; Can realize the functions such as Two-way energy transfer, trend control and the quality of power supply adjusting of electric power electric transformer;
2, the high-pressure side of power model group of the present utility model adopts series system, for different brackets voltage, only need to calculate the serial number of corresponding power model M1, just can bear corresponding voltage according to corresponding power model string connection;
3, the low-pressure side of power model group of the present utility model adopts parallel way, for different output power, only need to calculate the number in parallel of corresponding power model, counts parallel connection corresponding power just can be provided according to corresponding power model;
4, three-phase power electronic transformer of the present utility model be easy to modularization, standardization, can redundancy, thereby be convenient to design, processing, assembling, debugging and maintenance etc.;
5, circuit topology of the present utility model itself has had the function of three-phase electric energy automatic mutual balance concurrently, can tackle preferably the asymmetric load of low-pressure side, and the asymmetric of low-pressure side is transformed into on high-tension side symmetry naturally by topological connection;
6, the DC side of three-phase power electronic transformer of the present utility model can conveniently access the regenerative resource such as photovoltaic, wind-force and energy storage device, improves renewable energy utilization rate and power supply reliability;
7, three-phase power electronic transformer of the present utility model provides two kinds of topological structures and to control order ground flexible Application according to different power grades;
If 8 power flow directions do not need to realize two-way flow, can further simplify corresponding topological structure to three-phase power electronic transformer of the present utility model, reduce the complexity of control system, the spending of saving equipment.
Brief description of the drawings
Fig. 1 is the electric power electric transformer schematic diagram without DC link;
Fig. 2 is the electric power electric transformer schematic diagram containing DC link;
Fig. 3 is the structural representation of the three phase power module group one of mutual balance in the utility model;
Fig. 4 is the simplified structure schematic diagram of the three phase power module group one of mutual balance in the utility model;
Fig. 5 is the structural representation of the three phase power module group two of mutual balance in the utility model;
Fig. 6 is the simplified structure schematic diagram of the three phase power module group two of mutual balance in the utility model;
Fig. 7 is the schematic diagram of three-phase power electronic transformer embodiment mono-in the present embodiment;
Fig. 8 is the schematic diagram of three-phase power electronic transformer embodiment bis-in the present embodiment;
Fig. 9 is the schematic diagram of three-phase power electronic transformer embodiment tri-in the present embodiment;
Figure 10 is H bridge main circuit topological structure schematic diagram in the utility model;
Figure 11 is with tapped DC/DC conversion schematic diagram in the utility model;
Figure 12 is diode rectification schematic diagram in the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The power model group of a kind of three-phase power electronic transformer that the utility model provides, this power model group can be used for modularization, can balance asymmetric load, low-voltage direct can be provided.Electric power electric transformer (PET) refers to the novel electric power transformer that adopts power electronics converter and medium/high frequency power transformer to realize.
This power model group comprises the power model unit of high-pressure side series connection, low-pressure side parallel connection, power model unit comprises the first power model, high-pressure side capacitor, the second power model, medium/high frequency power transformer and the 3rd power model that connect successively, the 3rd power model low-voltage side capacitor in parallel; The first power model is for being transformed into direct current by industrial-frequency alternating current; High-pressure side capacitor is used for providing direct voltage to support and power storage; The second power model is for being transformed into medium/high frequency alternating current by direct current; Medium/high frequency power transformer is for electric pressure conversion and electrical isolation between high-pressure side and low-pressure side; The 3rd power model is for being transformed into direct current by medium/high frequency alternating current; Described low-voltage side capacitor is used for providing direct voltage to support and power storage.
Described the 3rd power model comprises the power model of the capacity such as a power model or three.In the time that the 3rd power model is a power model, medium/high frequency power transformer employing 1 turns the transformer of 1 structure; In the time that the 3rd power model comprises three power models, medium/high frequency power transformer employing 1 turns the transformer of 3 structures.In the time that described the 3rd power model comprises a power model, described medium/high frequency power transformer employing 1 turns the transformer of 1 structure; Described power model unit is the power model unit of M structure.In the time that described the 3rd power model comprises the power model of three same capabilities, described medium/high frequency power transformer employing 1 turns the transformer of 3 structures; Described the 3rd power model unit is the power model unit of M/3 structure.
If for the second power model M2 of same capability, the 3rd power model can be a power model that capacity is L, or comprises the power model that three capacity are 1/3L.
In the utility model, the compound mode of power model group requires to determine according to the output of the withstand voltage level of high-pressure side rated voltage, described the first power model and power model group; The series connection of high-pressure side, power model unit, low-pressure side parallel connection, for different power outputs, can provide corresponding power according to the number of different capacity modular unit, meets different output power requirement.
If when the AC serial number of described the first power model is 3n, every power model cell formation power model group that adopts mutually 3n M structure, the overall number of reduction power model and corresponding cost, n is positive integer.
If when the AC serial number of described the first power model is 3n+1, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 1 M/3 structure of adopting mutually, the overall number and the corresponding cost that reduce power model, n is positive integer.
If when the AC serial number of described the first power model is 3n+2, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 2 M/3 structures of adopting mutually, to reduce overall number and the corresponding cost of power model, n is positive integer.
If the AC serial number of described the first power model is 3n+1 or 3n+2, and while having direct current output to require, every respective combination that adopts mutually the power model unit of M structure and the power model unit of M/3 structure forms corresponding power module group to meet corresponding direct current output, adopt the respective combination of the power model unit of M structure and the power model unit of M/3 structure to form corresponding power module group to meet the corresponding output that exchanges simultaneously, to reduce overall number and the corresponding cost of power model, n is positive integer.
The first power model, the second power model and the 3rd power model all adopt H bridge main circuit topology, realize the two-way flow of guaranteeing power in the time of AC-DC conversion;
Four brachium pontis of described H bridge main circuit topology comprise respectively anti-paralleled diode in parallel and can turn-off power electronic device;
The described power electronic device of turn-offing comprises IGBT, IEGT, GTO, IGCT and BIGT etc.
Under the prerequisite of not required power two-way flow, described the 3rd power model also can adopt diode to make rectifier diode, and the brachium pontis of above-mentioned H bridge main circuit topological structure adopts respectively rectifier diode, simplifies and controls, and reduces number of devices and cost.
The high-voltage alternating side of power model group is connected with electrical network through described hv filtering device, adopts between phase and phase triangle to connect or Y-connection.The low-pressure side parallel connection of power model group, forms the DC source of three tunnels and above each self-isolation, meets different engineering demands.
The DC source of above-mentioned three tunnels and above each self-isolation, can carry out direct current and convert industrial frequency AC to, provides industrial frequency AC through low voltage filter.The described industrial frequency AC on Mei San road, can adopt star-star connection and delta connection, and three-phase alternating current interface is provided.
Described star-star connection can be drawn neutral point, realizes three-phase four-wire system.
In the middle of described medium/high frequency power transformer, can not draw tap, also can draw tap.Described in while drawing tap, the both sides power model of medium/high frequency power transformer and corresponding capacitor wiring should have corresponding adjustment.
In the time adopting the 3rd power model of different structure, the structure of power model unit is as follows respectively:
One, the first power model unit topological structure
As shown in Figure 3, Fig. 3 is the structural representation of the three phase power module group one of mutual balance in the utility model, and this power model group comprises 9 power models, 3 medium/high frequency power transformers and 6 capacitors.9 power models are respectively 3 the first power model M1,3 the second power model M2 and 3 the 3rd power model M3.
3 capacitors are in high-pressure side, and 3 capacitors are in low-pressure side, and wherein, 3 low-voltage side capacitors can replace with a more jumbo capacitor.
The first power model M1 is for being transformed into direct current by industrial frequency AC, high-pressure side capacitor is used for providing direct voltage to support and power storage, the second power model M2 is for becoming DC converting medium/high frequency to exchange, medium/high frequency power transformer is for electric pressure conversion and electrical isolation between high-pressure side and low-pressure side, the 3rd power model M3 is for medium/high frequency exchange conversion is become to direct current, and low-voltage side capacitor is used for providing direct voltage to support and power storage.
The three phase power module group of this mutual balance has 6 high-voltage alternating ends and 2 low-voltage direct ends.6 high-voltage alternating ends are respectively A11, A12, B11, B12, C11 and C12.Wherein, A11 exchanges access terminal with A12Wei mono-tunnel, and B11 exchanges access terminal with B12Wei mono-tunnel, and C11 exchanges access terminal with C12Wei mono-tunnel.2 low-voltage direct ends are respectively DC1+ and DC1-.
The high-voltage alternating of A phase is by A11 and this two termination of A12 the first power model M1, and the first power model M1 is transformed into after direct current industrial frequency AC to high-pressure side capacitor.
The second power model M2 mono-termination high-pressure side capacitor, and connect medium/high frequency power transformer after becoming medium/high frequency to exchange DC converting, medium/high frequency power transformer meets the 3rd power model M3 after realizing electric pressure conversion and electrical isolation, the a11 of the 3rd power model M3 and a12 form a road direct current, connect low-voltage side capacitor.It is similar to c11 and the c12 wiring of low-pressure side that the high-pressure side B11 of B phase and B12 arrive the b11 of low-pressure side and the high-pressure side C11 of b12 and C phase and C12, repeats no longer one by one.
High-voltage alternating end A11, A12, B11, B12, C11, C12 is independent separately, so that select the serial number of corresponding the first power model M1 according to corresponding alternating voltage.
A11, the b11 of low-pressure end is connected by public DC bus DC1+ with c11, and a12, the b12 of low-pressure end is connected by public DC bus DC1-with c12, is convenient to realize the mutual balance between three-phase.
The three phase power module group of this mutual balance can realize the two-way flow of power, can be from high-voltage alternating effluent to low-voltage direct side, and also can be from low-voltage direct effluent to high-voltage alternating side.If Practical Project only need to be realized the one-way flow of power, corresponding power model can be simplified, and to reduce the complexity of control, reduces the cost of equipment simultaneously.
By the three phase power module group of the mutual balance in Fig. 3, adopt the schematic diagram of more simplifying, as shown in the simplified structure schematic diagram of the three phase power module group one of mutual balance in Fig. 4.Power model M in Fig. 4 is the organized assembles of the first power model M1, high-pressure side capacitor, the second power model M2, medium/high frequency power transformer, the 3rd power model M3 and low-voltage side capacitor in Fig. 3.Rough schematic view in Fig. 4 has embodied a concentrated reflection of power model M can realize series connection in high-pressure side, can realize feature in parallel in low-pressure side.
Two, the second power model unit topological structure
As shown in Figure 5, three phase power module group two structural representations that Fig. 5 is a kind of mutual balance, this three phase power module group two comprises that 15 power models, 31 tunnels turn medium/high frequency power transformer and 12 capacitors on 3 tunnels.
15 power models are respectively 3 the first power model M1,3 the second power model M2 and 9 the 4th power model M4.
3 capacitors are in high-pressure side, and 9 capacitors are in low-pressure side, and wherein, 9 low-voltage side capacitors can replace with 3 jumbo capacitors.
It should be noted that: the circuit topology of the 3rd power model M3 in the 4th power model M4 and Fig. 3 in Fig. 5 can be identical, still, for the second power model M2 of same capability, the capacity of the 4th power model M4 only has 1/3 of the 3rd power model M3 conventionally.
The first power model M1 is for being transformed into direct current by industrial frequency AC, high-pressure side capacitor is used for providing direct voltage to support and power storage, the second power model M2 is for becoming DC converting medium/high frequency to exchange, 1 tunnel turns the medium/high frequency power transformer on 3 tunnels for electric pressure conversion and electrical isolation between high-pressure side and low-pressure side, the 4th power model M4 is for medium/high frequency exchange conversion is become to direct current, and low-voltage side capacitor is used for providing direct voltage to support and power storage.
The three phase power module group of this mutual balance has 6 high-voltage alternating ends and 6 low-voltage direct ends.6 high-voltage alternating ends are respectively A11, A12, and B11, B12, C11 and C12, wherein A11 exchanges access terminal with A12Wei mono-tunnel, and B11 exchanges access terminal with B12Wei mono-tunnel, and C11 exchanges access terminal with C12Wei mono-tunnel.6 low-voltage direct ends are respectively DC1a+, DC1a-, DC1b+, DC1b-, DC1c+ and DC1c-, wherein DC1a+ and DC1a-Wei Yi road direct current access terminal, DC1b+ and DC1b-Wei Yi road direct current access terminal, DC1c+ and DC1c-Wei Yi road direct current access terminal.
The high-voltage alternating of A phase is by A11 and this two termination of A12 the first power model M1, the first power model M1 is transformed into after direct current industrial frequency AC to high-pressure side capacitor, the second power model M2 mono-termination high-pressure side capacitor, and connect medium/high frequency power transformer after becoming medium/high frequency to exchange DC converting, when medium/high frequency power transformer is realized electric pressure conversion and electrical isolation, also realize 1 tunnel and turn the function on 3 tunnels.The normally uniform distribution of the power on 3 tunnels.
The low-pressure side three tunnel outputs of medium/high frequency power transformer meet respectively 3 power model M4.3 power model M4 realize separately medium/high frequency exchange conversion and become after direct current, are connected respectively by low-pressure end aa11, aa12, ba11, ba12, ca11 and ca12 with three low-voltage side capacitors.Wherein, aa11 and aa12 form a road direct current, and ba11 and ba12 form a road direct current, and ca11 and ca12 form a road direct current.It is similar to ac11, ac12, bc11, bc12, cc11 and the cc12 wiring of low-pressure side that the high-pressure side B11 of B phase and B12 arrive ab11, ab12, bb11, bb12, cb11 and the cb12 of low-pressure side and the high-pressure side C11 of C phase and C12, repeats no longer one by one.
High-voltage alternating end A11, A12, B11, B12, C11, C12 is independent separately, so that select the serial number of corresponding power model M1 according to corresponding alternating voltage.Aa11, the ab11 of low-pressure end is connected by public DC bus DC1a+ with ac11, aa12, the ab12 of low-pressure end is connected by public DC bus DC1a-with ac12, ba11, the bb11 of low-pressure end is connected by public DC bus DC1b+ with bc11, ba12, the bb12 of low-pressure end is connected by public DC bus DC1b-with bc12, ca11, the cb11 of low-pressure end is connected by public DC bus DC1c+ with cc11, and ca12, the cb12 of low-pressure end is connected by public DC bus DC1c-with cc12.
The three phase power module group of this mutual balance can realize the two-way flow of power, can be from high-voltage alternating effluent to low-voltage direct side, and also can be from low-voltage direct effluent to high-voltage alternating side.
By the three phase power module group of a kind of mutual balance in Fig. 5, adopt the schematic diagram of more simplifying, as shown in three phase power module group two simplified structures of mutual balance in Fig. 6.Power model M/3 in Fig. 6 is the organized assembles that the first power model M1, high-pressure side capacitor, the second power model M2,1 tunnel in accompanying drawing 5 turns medium/high frequency power transformer, power model M4 and the low-voltage side capacitor on 3 tunnels.
Rough schematic view in Fig. 6 has embodied a concentrated reflection of power model M/3 can realize series connection in high-pressure side, can realize feature in parallel in low-pressure side.
Power model group one in Fig. 4 exchanges the conversion of He Yi road direct current for realizing three tunnels, the power model group two in Fig. 6 exchanges the conversion of He San road direct current for realizing three tunnels.
In embodiment, provide the three-phase power electronic transformer based on above power model unit M and power model unit M/3:
Embodiment mono-, based on the three-phase power electronic transformer of power model unit M.
In the present embodiment, when the AC serial number of the first power model M1 is 3n, every power model cell formation power model group that adopts mutually 3n M structure, the overall number of reduction power model and corresponding cost, n is positive integer.
As shown in Figure 7, Fig. 7 is the schematic diagram of three-phase power electronic transformer embodiment mono-in the present embodiment.For the high-voltage alternating voltage gradation requiring, the AC serial number of calculating corresponding the first power model M1 is 3n, and wherein, n is natural number.If when calculating the AC serial number of corresponding the first power model M1 and being 3n+1 or 3n+2, shown in following embodiment bis-, three.
For each phase, all there is the high-voltage alternating side employing of 3n power model M to be connected in series, and be connected with the corresponding of high-voltage alternating side of electrical network by hv filtering device.Can adopt between phase and phase Y-connection, also can adopt triangle to connect.In the present embodiment one, adopt between phase and phase Y-connection.
The 3n*3 road direct current of 3n*3 power model unit M is divided into 3 groups equably, and by the final 3 road direct currents that form of mode in parallel, is respectively DC1, DC2 and DC3.Zhe San road direct current is realized the power conversion of direct current to industrial frequency AC by power model M5 respectively, obtains three tunnels and exchanges output, is respectively that a1 and the a2 composition first via exchanges, b1 forms with b2 that the second tunnel exchanges and c1 exchanges with c2 composition Third Road.
Above three tunnels exchange at the low voltage filter through separately.Adopt between phase and phase Y-connection, and draw neutral line N, as shown in Figure 7.Above three tunnels exchange and also can adopt triangle to connect.
Embodiment bis-, based on the three-phase power electronic transformer of power model unit M and power model unit M/3.
If when the AC serial number of the first power model M1 is 3n+1, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 1 M/3 structure of adopting mutually, the overall number and the corresponding cost that reduce power model, n is positive integer.
As shown in Figure 8, Fig. 8 is the schematic diagram of three-phase power electronic transformer embodiment bis-in the present embodiment.For the high-voltage alternating voltage gradation requiring, the AC serial number of calculating corresponding the first power model M1 is 3n+1 (n is positive integer).
In the present embodiment, n is natural number 1, and the AC serial number of the first power model M1 is 4.Thereby, in the present embodiment, for each phase, all have the AC employing of 3 power model M and 1 power model M/3 to be connected in series, and be connected with the corresponding of high-voltage alternating side of electrical network by hv filtering device.Can adopt between phase and phase triangle to connect, also can adopt Y-connection.In the present embodiment, adopt between phase and phase triangle to connect.
The 9 road direct currents of 9 power model unit M and the 9 road direct currents of 3 power model unit M/3,18 road direct currents are divided into 3 groups equably altogether, be that a11, a12, aa41, aa42, b11, b12, ab41, ab42, c11, c12, ac41, ac42 are first group, a21, a22, ba41, ba42, b21, b22, bb41, bb42, c21, c22, bc41, bc42 are second group, and a31, a32, ca41, ca42, b31, b32, cb41, cb42, c31, c32, cc41, cc42 are the 3rd group.
Above three groups finally form 3 road direct currents by mode in parallel, are respectively DC1, DC2 and DC3.Zhe San road direct current is realized the power conversion of direct current to industrial frequency AC by the 5th power model M5 respectively, obtains three tunnels and exchanges output, is respectively that a1 and the a2 composition first via exchanges, b1 forms with b2 that the second tunnel exchanges and c1 exchanges with c2 composition Third Road.Above three tunnels exchange at the low voltage filter through separately, adopt between phase and phase Y-connection, and draw neutral line N, as shown in the embodiment bis-in Fig. 8.Above three tunnels exchange and also can adopt triangle to connect.
Embodiment tri-, based on the three-phase power electronic transformer of power model unit M and power model unit M/3.
If the AC serial number of the first power model M1 is 3n+1 or 3n+2, and while having direct current output to require, every respective combination that adopts mutually the power model unit of M structure and the power model unit of M/3 structure forms corresponding power module group to meet corresponding direct current output, adopt the respective combination of the power model unit of M structure and the power model unit of M/3 structure to form corresponding power module group to meet the corresponding output that exchanges simultaneously, to reduce overall number and the corresponding cost of power model, n is positive integer.
As shown in Figure 9, Fig. 9 is the schematic diagram of three-phase power electronic transformer embodiment tri-in the present embodiment.For the high-voltage alternating voltage gradation requiring, the AC serial number of calculating corresponding the first power model M1 is 3n+2 (n is positive integer).
In the present embodiment, n is natural number 1, and the AC serial number of the first power model M1 is 5.Thereby, in the present embodiment, for each phase, all have the AC employing of 4 power model unit M and 1 power model unit M/3 to be connected in series, and be connected with the corresponding of high-voltage alternating side of electrical network by hv filtering device; Can realize and exchange input with this structure, exchange output and direct current and export, below further illustrate as an example of the structure of 4 power model unit M and 1 power model unit M/3 example.
Adopt between phase and phase triangle to connect, also can adopt Y-connection.In this enforcement, adopt between phase and phase triangle to connect.
The 9 road direct currents of 9 power model unit M and the 9 road direct currents of 3 power model unit M/3,18 road direct currents are divided into 3 groups equably altogether, be that a11, a12, aa41, aa42, b11, b12, ab41, ab42, c11, c12, ac41 and ac42 are first group, a21, a22, ba41, ba42, b21, b22, bb41, bb42, c21, c22, bc41 and bc42 are second group, and a31, a32, ca41, ca42, b31, b32, cb41, cb42, c31, c32, cc41 and cc42 are the 3rd group.
These three groups finally form 3 road direct currents by mode in parallel, are respectively DC1, DC2 and DC3.Zhe San road direct current is realized the power conversion of direct current to industrial frequency AC by the 5th power model M5 respectively, obtains three tunnels and exchanges output, is respectively that a1 and the a2 composition first via exchanges, b1 forms with b2 that the second tunnel exchanges and c1 exchanges with c2 composition Third Road.Above three tunnels exchange at the low voltage filter through separately, adopt between phase and phase triangle to connect, as shown in the embodiment tri-in Fig. 9.Zhe San road exchanges and also can adopt Y-connection.
In addition, the 3 road direct currents of 3 power model unit M, a51 and a52 are first via direct current, and b51 and b52 are the second road direct current, and c51 and c52 are Third Road direct current.This 3 road direct current forms independent DC power supply DC4 by parallel connection, so that independent DC power supply output to be provided, and meets corresponding power requirement, as shown in the embodiment tri-in Fig. 9.
Embodiment tetra-, based on the three-phase power electronic transformer of power model unit M and power model unit M/3.
If when the AC serial number of the first power model M1 is 3n+2, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 2 M/3 structures of adopting mutually, to reduce overall number and the corresponding cost of power model, n is positive integer.
Suppose, n is natural number 1, and the AC serial number of the first power model M1 is 5.
For each phase, all there is the AC employing of 3 power model unit M and 2 power model unit M/3 to be connected in series, and be connected with the corresponding of high-voltage alternating side of electrical network by hv filtering device; Realize and exchange input with this structure, exchange output;
For each phase, all there is the AC employing of 3 power model M and 2 power model M/3 to be connected in series, and be connected with the corresponding of high-voltage alternating side of electrical network by hv filtering device.Can adopt between phase and phase triangle to connect, also can adopt Y-connection.In the present embodiment, adopt between phase and phase triangle to connect.Similar to embodiment bis-.
In topological structure of the present utility model, the first power model M1, the second power model M2, the 3rd power model M3, the 4th power model M4 and the 5th power model M5 can adopt H bridge main circuit topological structure as shown in figure 10, to realize the conversion of alternating current-direct current, and keep the two-way flow of power.
H bridge main circuit topological structure is made up of four turn-offed power electronic device with anti-paralleled diode, and IGCT1, IGCT2, IGCT3 and the IGCT4 in figure is only signal, can be that IGBT, IEGT, GTO and BIGT etc. can turn-off power electronic device.
In topological structure of the present utility model, in the middle of the medium/high frequency power transformer in Fig. 3 and Fig. 5, do not draw tap.According to the needs of Practical Project, in the middle of can adopting, draw the medium/high frequency power transformer of tap, as this section from high-pressure side capacitor to low-voltage side capacitor in Fig. 3, can adopt the scheme shown in Figure 11.Scheme shown in Figure 11 can realize from direct current and convert high-frequency ac to, is then converting these functions of direct current to, owing to all adopting the turn-offed power electronic device with anti-paralleled diode, has therefore retained the function of to and fro flow of power.
Only require that if any a certain Practical Project power flows to low-pressure side from high-pressure side, and do not require that low-pressure side flows to high-pressure side, it is unidirectional to be that flow of power is, can not adopt the turn-offed power electronic device with anti-paralleled diode for some power models, and only adopt diode, the diode rectifier circuit as shown in accompanying drawing 12.Launch, can adopt the diode rectifier circuit in Figure 12 for the 4th power M4 in the 3rd power model M3 and Fig. 5 in Fig. 3, to realize the conversion of AC-to DC.
Finally should be noted that: above embodiment is only for illustrating the application's technical scheme but not restriction to its protection range; although the application is had been described in detail with reference to above-described embodiment; those of ordinary skill in the field are to be understood that: those skilled in the art still can carry out all changes, revise or be equal to replacement to the embodiment of application after reading the application; but these change, revise or be equal to replacement, within the claim protection range all awaiting the reply in application.
Claims (18)
1. a power model group for three-phase power electronic transformer, described three-phase power electronic transformer comprises hv filtering device, described power model group, the 5th power model and low voltage filter; It is characterized in that:
Described power model group comprises the power model unit in high-pressure side series connection and low-pressure side parallel connection respectively;
Described power model unit comprises the first power model, high-pressure side capacitor, the second power model, medium/high frequency power transformer and the 3rd power model that connect successively, described the 3rd power model low-voltage side capacitor in parallel;
Described the first power model is for being transformed into direct current by industrial-frequency alternating current; Described high-pressure side capacitor is used for providing direct voltage to support and power storage; Described the second power model is for being transformed into medium/high frequency alternating current by direct current; Described medium/high frequency power transformer is for electric pressure conversion and electrical isolation between high-pressure side and low-pressure side; Described the 3rd power model is for being transformed into direct current by medium/high frequency alternating current; Described low-voltage side capacitor is used for providing direct voltage to support and power storage;
Described the first power model, the second power model and the 3rd power model all adopt H bridge main circuit topology.
2. the power model group of a kind of three-phase power electronic transformer as claimed in claim 1, is characterized in that: described the 3rd power model comprises the power model of a power model or three same capabilities.
3. the power model group of a kind of three-phase power electronic transformer as claimed in claim 2, is characterized in that: in the time that described the 3rd power model comprises a power model, described medium/high frequency power transformer employing 1 turns the transformer of 1 structure; Described power model unit is the power model unit of M structure.
4. the power model group of a kind of three-phase power electronic transformer as claimed in claim 2, is characterized in that: in the time that described the 3rd power model comprises the power model of three same capabilities, described medium/high frequency power transformer employing 1 turns the transformer of 3 structures; Described power model unit is the power model unit of M/3 structure.
5. the power model group of a kind of three-phase power electronic transformer as claimed in claim 2, it is characterized in that: when described the second power model for same capability, the 3rd power model comprises the power model that a capacity is L or comprises the power model that three capacity are 1/3L.
6. the power model group of a kind of three-phase power electronic transformer as claimed in claim 1, is characterized in that: the compound mode of described power model group requires to determine according to the output of the withstand voltage level of high-pressure side rated voltage, described the first power model and power model group;
Can provide corresponding power according to the number of described power model unit, meet different output power requirement.
7. the power model group of a kind of three-phase power electronic transformer as claimed in claim 6, it is characterized in that: if when the AC serial number of described the first power model is 3n, every power model cell formation power model group that adopts mutually 3n M structure, the overall number and the corresponding cost that reduce power model, n is positive integer.
8. the power model group of a kind of three-phase power electronic transformer as claimed in claim 6, it is characterized in that: if when the AC serial number of described the first power model is 3n+1, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 1 M/3 structure of adopting mutually, the overall number and the corresponding cost that reduce power model, n is positive integer.
9. the power model group of a kind of three-phase power electronic transformer as claimed in claim 6, it is characterized in that: if when the AC serial number of described the first power model is 3n+2, and while not having independent direct current output to require, the every power model unit of 3n M structure and power model cell formation power model group of 2 M/3 structures of adopting mutually, to reduce overall number and the corresponding cost of power model, n is positive integer.
10. the power model group of a kind of three-phase power electronic transformer as claimed in claim 6, it is characterized in that: if the AC serial number of described the first power model is 3n+1 or 3n+2, and while having direct current output to require, every respective combination that adopts mutually the power model unit of M structure and the power model unit of M/3 structure forms corresponding power module group to meet corresponding direct current output, adopt the respective combination of the power model unit of M structure and the power model unit of M/3 structure to form corresponding power module group to meet the corresponding output that exchanges simultaneously, to reduce overall number and the corresponding cost of power model, n is positive integer.
The power model group of 11. a kind of three-phase power electronic transformers as claimed in claim 1, is characterized in that: described the first power model, the second power model and the 3rd power model are all realized the two-way flow of guaranteeing power in the time of AC-DC conversion;
Four brachium pontis of described H bridge main circuit topology comprise respectively anti-paralleled diode in parallel and can turn-off power electronic device;
The described power electronic device of turn-offing comprises IGBT, IEGT, GTO, IGCT and BIGT.
The power model group of 12. a kind of three-phase power electronic transformers as claimed in claim 1, it is characterized in that: under the prerequisite of not required power two-way flow, the brachium pontis of the H bridge main circuit topological structure that described the 3rd power model adopts adopts respectively rectifier diode, simplify and control, reduce number of devices and cost.
The power model group of 13. a kind of three-phase power electronic transformers as claimed in claim 1, is characterized in that: the high-voltage alternating side of described power model group is connected with electrical network through described hv filtering device, adopts between phase and phase triangle to connect or Y-connection.
The power model group of 14. a kind of three-phase power electronic transformers as claimed in claim 1, is characterized in that: the low-pressure side parallel connection of described power model group, form the DC source of three tunnels and above each self-isolation, and meet different engineering demands.
The power model group of 15. a kind of three-phase power electronic transformers as claimed in claim 14, is characterized in that: the DC source of described three tunnels and above each self-isolation, and can carry out direct current and convert industrial frequency AC to, provide industrial frequency AC through low voltage filter.
The power model group of 16. a kind of three-phase power electronic transformers as claimed in claim 15, is characterized in that: the described industrial frequency AC on Mei San road, can adopt star-star connection and delta connection, and three-phase alternating current interface is provided.
The power model group of 17. a kind of three-phase power electronic transformers as claimed in claim 16, is characterized in that: described star-star connection can be drawn neutral point, realizes three-phase four-wire system.
The power model group of 18. a kind of three-phase power electronic transformers as claimed in claim 1, is characterized in that: in the middle of described medium/high frequency power transformer, can not draw tap, also can draw tap;
Described in while drawing tap, the both sides power model of medium/high frequency power transformer and corresponding capacitor wiring should have corresponding adjustment.
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| CN201420465851.9U CN204031006U (en) | 2014-08-18 | 2014-08-18 | A kind of power model group of three-phase power electronic transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
| CN109950923A (en) * | 2019-03-26 | 2019-06-28 | 国网北京市电力公司 | AC-AC converter device, the connection method of power grid and device |
| CN110890781A (en) * | 2018-09-06 | 2020-03-17 | 乐金电子研发中心(上海)有限公司 | Modularized vehicle-mounted charger |
-
2014
- 2014-08-18 CN CN201420465851.9U patent/CN204031006U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184356A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Power module group of three-phase power electronic transformer |
| CN104184356B (en) * | 2014-08-18 | 2017-07-14 | 国家电网公司 | A kind of power model group of three-phase power electronic transformer |
| CN110890781A (en) * | 2018-09-06 | 2020-03-17 | 乐金电子研发中心(上海)有限公司 | Modularized vehicle-mounted charger |
| CN109950923A (en) * | 2019-03-26 | 2019-06-28 | 国网北京市电力公司 | AC-AC converter device, the connection method of power grid and device |
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