A kind of electric power electric transformer with energy storage device
Technical field
The present invention relates to electrical engineering technical field, in particular to a kind of electric power electric transformer with energy storage device.
Background technique
Electric power electric transformer is a kind of to combine power electronic devices and high frequency transformer, pass through electronic power conversion
Technology realizes the transformer of transformation of electrical energy, except converting with voltage, in addition to the basic functions such as electrical isolation, energy transmission, also has
Controllability is high, and the advantages that controlling waveform, trend, utility power quality control and automatic protection may be implemented, and is power distribution network ideal
Controller switching equipment.In the vehicle-mounted converter system, smart grid/energy internet and distributed type renewable of electric locomotive traction
It is widely used in energy electricity generation grid-connecting system.
Conventional electric power electronic transformer output end uses conventional inverter, to prevent same inverter bridge leg or more switching tube same
When conducting cause inverter to damage, dead time often is added in the switching signal of bridge arm switching tube, this make instead output hand over
Galvanic electricity corrugating is distorted.In addition, topology does not have modular construction, and with the increase of level number, become circuit topology
Must be extremely complex, so, it is necessary to a kind of electric power electric transformer with energy storage device.
Summary of the invention
The embodiment of the invention provides a kind of electric power electric transformers with energy storage device, deposit in the prior art to solve
The problem of.
A kind of electric power electric transformer with energy storage device, comprising: A circuitry phase, B circuitry phase, C circuitry phase and accumulation energy type
Quasi-Z source inventer, electric power electric transformer high pressure flank 10kV power distribution network, connecting terminal A, B, C, the A circuitry phase
End x and the end y of the B circuitry phase be electrically connected with the end z of the C circuitry phase into common point o, the electric power electricity
Sub- transformer low voltage flanks 400V grade power distribution network, connecting terminal a, b, c;
Three-phase 10kV alternating voltage by the A circuitry phase, the B circuitry phase and the C circuitry phase carry out partial pressure with every
From transformation, High Level AC Voltage is transformed to direct current, is all connected with DC bus P and N, the DC bus P and N are electrically connected storage
DC power conversion is that three-phase 400V grade alternating current connects low-voltage network by energy type Quasi-Z source inventer;
The A circuitry phase includes input stage and isolated variable grade, and the input stage is by 9 H bridging connection module cascaded series
At the isolated variable grade is made of 3 unit module cascades, and the unit module is by 3 primary side Multiple coils and a secondary side
Simplex winding is coupled to form, and the A circuitry phase structure and the B circuitry phase structure and the C circuitry phase structure are all the same.
Preferably, the accumulation energy type Quasi-Z source inventer includes: inductance L1, full-controlled switch device S7 and capacitor C2,
One end of the inductance L1 connects DC bus P, and the other end of the inductance L1 connects the emitter of full-controlled switch device S7,
The hair of the full-controlled switch device S7 is connected after the collector series inductance L2 and capacitor C2 of the full-controlled switch device S7
Emitter-base bandgap grading connects DC bus N after the collector shunt capacitance C1 and battery B1 of the full-controlled switch device S7, in the electricity
Feel the collector that full-controlled switch device S1, S3 and S5 are connected between the L2 and capacitor C2, the DC bus N connection is controlled entirely
The emitter of type switching device S4, S6 and S2, the emitter of the full-controlled switch device S1 and the full-controlled switch device
The collector of S4 is connected to output end a, the emitter of the full-controlled switch device S3 and the full-controlled switch device S6
Collector be connected to output end b, the emitter of the full-controlled switch device S5 and the full-controlled switch device S2's
Collector is connected to output end c.
Preferably, the H bridging connection module includes four full-controlled switch devices SAi, SAi+1, SAi+2, SAi+3 and electricity
Hold CAm, the collector of the full-controlled switch device SAi is connected with the collector of the full-controlled switch device SAi+1 and connects
It connects in the capacitor CAmOne end, the emitter of the full-controlled switch device SAi+2 and the full-controlled switch device SAi+3
Emitter be connected and be both connected to the capacitor CAmThe other end, the emitter of the full-controlled switch device SAi with it is described
The collector of full-controlled switch device SAi+2 is connected to a connecting terminal, the transmitting of the full-controlled switch device SAi+1
The collector of pole and the full-controlled switch device SAi+3 are connected to a connecting terminal.
The invention has the advantages that:
(1), electric power electric transformer proposed by the present invention have high-pressure side high voltage, low current and low-pressure side low-voltage,
The characteristics of high current, reduces transformer and submodule quantity, improves the power density of electric power electric transformer;
(2), for the present invention during transformation of electrical energy and energy fluctuation, higher level's distribution net side grid entry point electric current THD is enough
It is small, electric power electric transformer can be effectively inhibited and give higher level's power distribution network bring harmonic wave;
(3), electric power electric transformer proposed by the invention has good power tracking performance, is guaranteeing power quality
In the case where, maintenance low-voltage network is stablized, moreover it is possible to which the voltage/frequency for participating in higher level's power distribution network is adjusted, and has certain be used to
Property with damping.
Detailed description of the invention
Fig. 1 is a kind of topological structure signal of electric power electric transformer with energy storage device provided in an embodiment of the present invention
Figure;
Fig. 2 is a kind of every circuitry phase figure of the electric power electric transformer with energy storage device provided in an embodiment of the present invention;
Fig. 3 is a kind of H bridging connection module of the electric power electric transformer with energy storage device provided in an embodiment of the present invention
Structural schematic diagram.
Specific embodiment
Below with reference to the attached drawing in inventive embodiments, technical solution in the embodiment of the present invention carries out clear, complete
Description, it is to be understood that the protection scope of the present invention is not limited by the specific implementation manner.
Distribution network voltage caused by intermittence and power swing of the present invention for the power generation of high permeability distributed generation resource/
Frequency instability problem proposes a kind of new topological structure new suitable for three-phase 10kV/400V electric power electric transformer.It should
The transformer of kind topological structure is also able to achieve close friend's support to higher level's power distribution network while maintaining low-voltage network to stablize.This
Power buffering can be obtained by DC interface by inventing the electric power electric transformer proposed, to maintain low-voltage network function in PET
While rate consumes, also there is the ability that higher level's distribution network voltage/frequency is adjusted that participates in.
The invention patent is directed to disadvantage existing in the prior art, and in isolated variable grade, high frequency transformer is using fixation
The unit module that the primary side Multiple coil of number is coupled with secondary side simplex winding cascades, and structure is simple, convenient for extension.Output end is adopted
With unique impedance network to allow same bridge arm or more switching tube to simultaneously turn on, it is made to have certain stepping functions.
Due to the work normality that pass-through state is Z-source inverter, without being inserted into dead time in commutation course.
Referring to Fig.1, the present invention provides a kind of electric power electric transformers with energy storage device, comprising: A circuitry phase, B phase electricity
Road, C circuitry phase and accumulation energy type Quasi-Z source inventer, electric power electric transformer high pressure flank 10kV power distribution network, and connecting terminal is
A, the end y of B, C, the end x of the A circuitry phase and the B circuitry phase with the end z of the C circuitry phase be electrically connected at
Common point o, the electric power electric transformer low pressure flank 400V grade power distribution network, connecting terminal a, b, c;
Three-phase 10kV alternating voltage by the A circuitry phase, the B circuitry phase and the C circuitry phase carry out partial pressure with every
From transformation, High Level AC Voltage is transformed to direct current, is all connected with DC bus P and N, the DC bus P and N are electrically connected storage
DC power conversion is that three-phase 400V grade alternating current connects low-voltage network by energy type Quasi-Z source inventer.
The accumulation energy type Quasi-Z source inventer includes: inductance L1, full-controlled switch device S7 and capacitor C2, the electricity
The one end for feeling L1 connects DC bus P, and the emitter of the other end connection full-controlled switch device S7 of the inductance L1 is described complete
The emitter of the full-controlled switch device S7, institute are connected after the collector series inductance L2 and capacitor C2 of control type switching device S7
State and connect DC bus N after the collector shunt capacitance C1 and battery B1 of full-controlled switch device S7, in the inductance L2 and
The collector of full-controlled switch device S1, S3 and S5, the DC bus N connection full-controlled switch are connected between the capacitor C2
The emitter of device S4, S6 and S2, the collection of the emitter of the full-controlled switch device S1 and the full-controlled switch device S4
Electrode is connected to output end a, the current collection of the emitter of the full-controlled switch device S3 and the full-controlled switch device S6
Pole is connected to output end b, the collector of the emitter of the full-controlled switch device S5 and the full-controlled switch device S2
It is connected to output end c.
This unique structure allows the switching tube on same bridge arm instantaneously to lead directly to, and improves the safety of system and reliable
Property;In addition, by introducing the straight-through stepping functions for measuring neatly control system, thus also overcome conventional voltage type inverter
The shortcomings that can only being depressured;Further, it compared to traditional single stage type, two-stage type inverter, is realized in the form of single-stage power conversion
Buck and inversion function.In addition, the electric current for flowing into output stage is continuously constant, Er Qieyou due to the effect of inductance L1
It is acted in partial pressure, the voltage on capacitor C2 wants small, and the voltage stress that device is born is small.
Referring to Fig. 2, the A circuitry phase includes input stage and isolated variable grade, and the input stage uses the more level of cascaded H-bridges
Topology is made of 9 H bridging connection module cascades, to reduce the voltage shared on each switching tube;
The isolated variable grade controls energy in bidirectional flow, by 3 unit module cascaded series using more active bridge topologys
Be coupled to form at, the unit module by 3 primary side Multiple coils and a secondary side simplex winding, prime respectively with H bridging connection module
DC capacitor be connected, rear class composes in parallel DC bus, and anode connects P DC bus, and cathode connects N DC bus;The A phase electricity
Line structure and the B circuitry phase structure and the C circuitry phase structure are all the same, and each phase is composed of multiple unit modules,
Structure is simple, convenient for extension.
Referring to Fig. 3, the H bridging connection module include four full-controlled switch devices SAi, SAi+1, SAi+2, SAi+3 and
Capacitor CAm, the collector of the full-controlled switch device SAi be connected with the collector of the full-controlled switch device SAi+1 and
It is connected to the capacitor CAmOne end, the emitter of the full-controlled switch device SAi+2 and the full-controlled switch device SAi
+ 3 emitter is connected and is both connected to the capacitor CAmThe other end, the emitter of the full-controlled switch device SAi and institute
The collector for stating full-controlled switch device SAi+2 is connected to a connecting terminal, the hair of the full-controlled switch device SAi+1
The collector of emitter-base bandgap grading and the full-controlled switch device SAi+3 are connected to a connecting terminal;High pressure industrial frequency AC is converted
The levitating type DC for being 9 for quantity, cascaded multilevel structure enable input stage power device with lesser voltage stress and switch
Frequency is applied to high-power.
In conclusion electric power electric transformer proposed by the present invention has high-pressure side high voltage, low current and low-pressure side low
The characteristics of voltage, high current, reduce transformer and submodule quantity, improves the power density of electric power electric transformer;This
During transformation of electrical energy and energy fluctuation, higher level's distribution net side grid entry point electric current THD is sufficiently small for invention, can effectively inhibit
Electric power electric transformer gives higher level's power distribution network bring harmonic wave;Electric power electric transformer proposed by the invention has good function
Rate tracking performance maintains low-voltage network to stablize, moreover it is possible to participate in the electricity of higher level's power distribution network in the case where guaranteeing power quality
Pressure/frequency is adjusted, and has certain inertia and damping.
Disclosed above is only a specific embodiment of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.