CN107732931B - Hybrid power electronic transformer based on three-phase matrix transformation and modulation method thereof - Google Patents
Hybrid power electronic transformer based on three-phase matrix transformation and modulation method thereof Download PDFInfo
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- CN107732931B CN107732931B CN201711101054.7A CN201711101054A CN107732931B CN 107732931 B CN107732931 B CN 107732931B CN 201711101054 A CN201711101054 A CN 201711101054A CN 107732931 B CN107732931 B CN 107732931B
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- 239000011159 matrix material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000009466 transformation Effects 0.000 title claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 72
- 238000012163 sequencing technique Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims 1
- 238000011161 development Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a mixed power electronic transformer based on three-phase matrix transformation and a modulation method thereof, wherein a matrix transformer and a filter are added into a traditional three-phase multi-winding transformer to form a novel mixed transformer based on the three-phase matrix transformer, so that unbalance degree and harmonic pollution of a power grid are effectively inhibited, meanwhile, a proper voltage modulation method is introduced, three-phase symmetrical sinusoidal voltage at an input side is modulated into voltage with specified frequency and amplitude at an output end according to a command signal, and sinusoidal output current under the action of the output voltage is modulated into three-phase symmetrical sinusoidal current of the input frequency, thereby achieving the purposes of controlling power quality such as voltage dip and fluctuation compensation, voltage regulation and constant voltage regulation, and greatly improving various indexes of the power quality.
Description
Technical Field
The invention relates to the technical field of application of power electronics in power systems, in particular to a hybrid power electronic transformer based on three-phase matrix transformation and a modulation method thereof.
Background
Electric energy is the most widely used energy source in modern society, the application degree of the electric energy marks the development level of a country, along with the rapid development of science and technology in China and national economy, the demand of people for electric energy is greatly increased, and meanwhile, the electric energy quality is higher and higher, and the electric energy quality has important significance for the safety, economic operation, industrial production and product quality of electric power systems and electric equipment and maintenance of normal living order.
The power transformer is a static induction electric appliance for transmitting alternating current electric energy by changing voltage, in a power system, the position of the power transformer is very important, the power transformer has a large required number and good performance, the power transformer is safe to operate, and the power transformer is applied to the power system and also applied to industrial and mining enterprises needing special power sources, such as: an electric furnace transformer for smelting, a rectifier transformer for electrolysis or chemical industry, an electric welding transformer for welding, a test transformer for testing, a traction transformer for transportation, a reactor for compensation, an arc suppression coil for protection, a transformer for measurement, and the like.
However, the conventional power transformer cannot meet the requirements of the development of the modern power system due to single structural function, at present, more and more power electronic devices are used in the power grid, the influence of the power electronic devices on the power quality is mainly harmonic, and due to nonlinearity of the power electronic devices, a large amount of high-order harmonic waves can be generated during operation and injected into the power system, so that the harmonic content of the system is increased, and then the voltage quality and the three-phase balance are also affected.
Disclosure of Invention
The invention solves the technical problems that: the utility model provides a mixed power electronic transformer based on three-phase matrix transformation and a modulation method thereof, which are used for solving the problems that the traditional transformer can not restrain the harmonic wave of a power grid and can not adjust and stabilize the voltage.
The technical scheme of the invention is as follows:
the utility model provides a hybrid power electronic transformer based on three-phase matrix transformation which characterized in that: the three-phase multi-winding transformer comprises a three-phase multi-winding transformer, a filter and a matrix converter, wherein the primary side of the three-phase multi-winding transformer is connected with a 10kV power grid, and the secondary side a phase of the three-phase multi-winding transformer comprises a phase a 1 Windings, b 1 Winding, secondary side b phase comprising a 2 Windings, b 2 Winding, secondary side c phase contains a 3 Windings, b 3 Windings, said a 1 Windings, a 2 Winding and a 3 The head ends of the windings are connected with the filter inductance of the filter, a 1 Windings, a 2 Winding and a 3 The tail end of the winding is connected with the neutral point of the filter and the inductive load, b 1 Windings, b 2 Winding and b 3 The head ends of the windings are connected with inductive loads, b 1 Windings, b 2 Winding and b 3 The tail ends of the windings are connected with a matrix converter, and the matrix converter is connected with a filter.
The three-phase multi-winding transformer is a power frequency oil immersed transformer.
The primary side of the three-phase multi-winding transformer is connected with a 10kV power grid in a Y-type mode.
The matrix converter comprises a first switch group, a second switch group and a third switch group, wherein the first switch group comprises a switch S aA 、S aB 、S aC The second switch group comprises a switch S bA 、S bB 、S bC The third switch group comprises a switch S cA 、S cB 、S cC ，S aA And S is equal to aB S and S aC Sequentially connected S bA And S is equal to bB S and S bC Sequentially connected S cA And S is equal to cB S and S cC Are connected in turn.
The switch S aA 、S aB 、S aC 、S bA 、S bB 、S bC 、S cA 、S cB 、S cC The two sets of bidirectional switch structures are connected in series.
The bidirectional switch structure comprises an IGBT semiconductor and a reverse diode, wherein the IGBT semiconductor and the reverse diode are connected in parallel.
The utility model provides a hybrid power electronic transformer based on three-phase matrix transformation which characterized in that: the modulation method comprises the following steps:
step 1: collecting input current, sequencing input current instructions, and dividing three input phases of the converter into a maximum phase, an intermediate phase and a minimum phase of the instruction current;
step 2: sequencing the three-phase command current amplitude values, and dividing three input phases of the converter into a command current amplitude maximum phase, an amplitude intermediate phase and an amplitude minimum phase;
step 3: dividing a power supply period into six parts according to the maximum phases of the command current, and determining the names of all input phases of the converter according to the sequence of the instantaneous values of the command current;
step 4: intermediate phase according to command currentThe sign of (2) divides the power supply period of the converter into an X area and a Y area;
step 5: collecting the output command voltage of the converteru oA 、u oB 、u oC Calculating the modulation wave voltage of the output phase voltages of the X area and the Y area;
step 6: PWM carrier modulation is performed on the modulated wave.
The step 1 is to collect input current, order the input current command, divide three input phases of the converter into a maximum phase, an intermediate phase and a minimum phase of command current, and order the input current command according to the following calculation formula:
in the method, in the process of the invention,instruction current maximum phase, intermediate phase and minimum phase respectively, < >> And the input currents are respectively acquired by three phases a, b and c.
The step 2 of sequencing the three-phase command current amplitude, dividing the three input phases of the converter into a command current amplitude maximum phase, an amplitude intermediate phase and an amplitude minimum phase, and sequencing the three-phase command current amplitude according to the calculation formula:
in |i * | max 、|i * | mid 、|i * | min The maximum amplitude phase, the intermediate amplitude phase and the minimum amplitude phase of the command current are respectively adopted,and the input current amplitude values are respectively acquired for the a phase, the b phase and the c phase.
Step 5, outputting command voltage u by the acquisition converter oA 、u oB 、u oC And calculating the modulation wave voltage of the output phase voltages of the X area and the Y area, wherein the calculation formula is as follows:
wherein u is oA 、u oB 、u oC For the inverter to output a command voltage, and outputting the modulated wave voltage of the phase voltage for the X area and the Y area.
The invention has the beneficial effects that: the invention forms a novel hybrid transformer based on a three-phase matrix converter by adding the matrix converter and the filter into the traditional three-phase multi-winding transformer, effectively inhibits unbalance degree and harmonic pollution of a power grid, simultaneously introduces a proper voltage modulation method, modulates three-phase symmetrical sinusoidal voltage at an input side into voltage with specified frequency and amplitude at an output end according to an instruction signal, modulates sinusoidal output current under the action of the output voltage into three-phase symmetrical sinusoidal current with the input frequency, and achieves the aims of controlling the quality of electric energy such as voltage dip and fluctuation compensation, voltage adjustment, constant voltage adjustment and the like, so that various indexes of the quality of the electric energy are greatly improved.
Drawings
The hybrid power electronic transformer topology of fig. 1;
fig. 2 shows a bi-directional switch structure.
Detailed Description
A mixed power electronic transformer based on three-phase matrix transformation comprises a three-phase multi-winding transformer, a filter and a matrix transformer, wherein the primary side of the three-phase multi-winding transformer is connected with a 10kV power grid, and the secondary side a phase of the three-phase multi-winding transformer comprises a 1 Windings, b 1 Winding, secondary side b phase comprising a 2 Windings, b 2 Winding, secondary side c phase contains a 3 Windings, b 3 Windings, said a 1 Windings, a 2 Winding and a 3 The head ends of the windings are connected with the filter inductance of the filter, a 1 Windings, a 2 Winding and a 3 The tail end of the winding is connected with the neutral point of the filter and the inductive load, b 1 Windings, b 2 Winding and b 3 The head ends of the windings are connected with inductive loads, b 1 Windings, b 2 Winding and b 3 The tail ends of the windings are connected with a matrix converter, the matrix converter is connected with a filter, and the front end of the converter is provided with an LC filter for filtering high-frequency components in the current at the input side of the converter.
The three-phase multi-winding transformer is a power frequency oil immersed transformer.
The primary side of the three-phase multi-winding transformer is connected with a 10kV power grid in a star-shaped mode, and high-order harmonic waves are effectively prevented from being transmitted to the power grid system.
The matrix converter is a switch array composed of a first switch group, a second switch group and a third switch group, wherein the first switch group comprises a switch S aA 、S aB 、S aC The second switch group comprises a switch S bA 、S bB 、S bC The third switch group comprises a switch S cA 、S cB 、S cC ，S aA 、S aB 、S aC Sequentially connected S aA And S is equal to aB S and S aC Sequentially connected S bA And S is equal to bB S and S bC Sequentially connected S cA And S is equal to cB S and S cC The matrix converter has good output characteristics, high and controllable input power factor, and can effectively eliminate harmonic pollution of the power grid without larger filter capacitance and has quick dynamic response.
The switch S aA 、S aB 、S aC 、S bA 、S bB 、S bC 、S cA 、S cB 、S cC The two sets of bidirectional switch structures are connected in series.
The bidirectional switch structure comprises an IGBT semiconductor and a reverse diode, wherein the IGBT semiconductor and the reverse diode are connected in parallel.
A modulation method of a hybrid power electronic transformer based on three-phase matrix transformation comprises the following steps:
step 1: collecting input current, sequencing input current instructions, and dividing three input phases of the converter into a maximum phase, an intermediate phase and a minimum phase of the instruction current;
step 2: sequencing the three-phase command current amplitude values, and dividing three input phases of the converter into a command current amplitude maximum phase, an amplitude intermediate phase and an amplitude minimum phase;
step 3: dividing a power supply period into six parts according to the maximum difference of command current amplitude values, determining the names of all input phases of the converter according to the sequence of command current instantaneous values, and calling the voltages of corresponding phases according to the corresponding names;
step 4: intermediate phase according to command currentThe sign of (a) divides the power cycle of the converter into X area and Y area when/>X region when->The time is the Y area;
step 5: collecting the output command voltage u of the converter oA 、u oB 、u oC Calculating the modulation wave voltage of the output phase voltages of the X area and the Y area;
step 6: and carrying out PWM carrier modulation on the modulated wave, outputting positive and negative modulated waves finally according to different partitions and the magnitude of the output command phase voltage, carrying out carrier PWM modulation, thus obtaining the voltage with the designated frequency and amplitude, and modulating the sinusoidal output current under the action of the output voltage into three-phase symmetrical sinusoidal current with the input frequency.
The step 1 is to collect input current, order the input current command, divide three input phases of the converter into a maximum phase, an intermediate phase and a minimum phase of command current, and order the input current command according to the following calculation formula:
in the method, in the process of the invention,instruction current maximum phase, intermediate phase and minimum phase respectively, < >> And the input currents are respectively acquired by three phases a, b and c.
The step 2 of sequencing the three-phase command current amplitude, dividing the three input phases of the converter into a command current amplitude maximum phase, an amplitude intermediate phase and an amplitude minimum phase, and sequencing the three-phase command current amplitude according to the calculation formula:
in |i * | max 、|i * | mid 、|i * | min The maximum amplitude phase, the intermediate amplitude phase and the minimum amplitude phase of the command current are respectively adopted,and the input current amplitude values are respectively acquired for the a phase, the b phase and the c phase.
Step 5, outputting command voltage u by the acquisition converter oA 、u oB 、u oC And calculating the modulation wave voltage of the output phase voltages of the X area and the Y area, wherein the calculation formula is as follows:
wherein u is oA 、u oB 、u oC For the inverter to output a command voltage, and outputting the modulated wave voltage of the phase voltage for the X area and the Y area.
Claims (8)
1. A modulation method of a hybrid power electronic transformer based on three-phase matrix transformation is characterized by comprising the following steps: the hybrid power electronic transformer comprises a three-phase multi-winding transformer, a filter and a matrix converter, wherein the primary side of the three-phase multi-winding transformer is connected with a 10kV power grid, and the secondary side a phase of the three-phase multi-winding transformer comprises a phase a 1 Windings, b 1 Winding, secondary side b phase comprising a 2 Windings, b 2 Winding, secondary side c phase contains a 3 Windings, b 3 Windings, said a 1 Windings, a 2 Winding and a 3 The head ends of the windings are connected with the filter inductance of the filter, a 1 Windings, a 2 Winding and a 3 The tail end of the winding is connected with the neutral point of the filter and the inductive load, b 1 Windings, b 2 Winding and b 3 The head ends of the windings are connected with inductive loads, b 1 Windings, b 2 Winding and b 3 The tail ends of the windings are connected with a matrix converter, and the matrix converter is connected with a filter; the modulation method comprises the following steps:
step 1: collecting input current, sequencing input current instructions, and dividing three input phases of the converter into a maximum phase, an intermediate phase and a minimum phase of the instruction current;
step 2: sequencing the three-phase command current amplitude values, and dividing three input phases of the converter into a command current amplitude maximum phase, an amplitude intermediate phase and an amplitude minimum phase;
step 3: dividing a power supply period into six parts according to the maximum phases of the command current, and determining the names of all input phases of the converter according to the sequence of the instantaneous values of the command current;
step 4: intermediate phase according to command currentThe sign of (2) divides the power supply period of the converter into an X area and a Y area; when->X region when->The time is the Y area;
step 5: collecting the output command voltage u of the converter oA 、u oB 、u oC Calculating the modulation wave voltage of the output phase voltages of the X area and the Y area;
step 5, outputting command voltage u by the acquisition converter oA 、u oB 、u oC And calculating the modulation wave voltage of the output phase voltages of the X area and the Y area, wherein the calculation formula is as follows:
an X region is provided, wherein the X region,
the Y-region of the glass fiber reinforced plastic film,
wherein u is oA 、u oB 、u oC For the inverter to output a command voltage, outputting a modulated wave voltage of a phase voltage for the X region and the Y region;
step 6: PWM carrier modulation is performed on the modulated wave.
2. The modulation method of a hybrid power electronic transformer based on three-phase matrix transformation according to claim 1, wherein: the three-phase multi-winding transformer is a power frequency oil immersed transformer.
3. The modulation method of a hybrid power electronic transformer based on three-phase matrix transformation according to claim 1, wherein: the primary side of the three-phase multi-winding transformer is connected with a 10kV power grid in a Y-type mode.
4. The modulation method of a hybrid power electronic transformer based on three-phase matrix transformation according to claim 1, wherein: the matrix converter comprises a first switch group, a second switch group and a third switch group, wherein the first switch group comprises a switch S aA 、S aB 、S aC The second switch group comprises a switch S bA 、S bB 、S bC The third switch group comprises a switch S cA 、S cB 、S cC ，S aA And S is equal to aB S and S aC Sequentially connected S bA And S is equal to bB S and S bC Sequentially connected S cA And S is equal to cB S and S cC Are connected in turn.
5. The modulation method for the hybrid power electronic transformer based on three-phase matrix transformation according to claim 4, wherein the modulation method comprises the following steps: the switch S aA 、S aB 、S aC 、S bA 、S bB 、S bC 、S cA 、S cB 、S cC The two sets of bidirectional switch structures are connected in series.
6. The modulation method for the hybrid power electronic transformer based on three-phase matrix transformation according to claim 5, wherein the modulation method comprises the following steps: the bidirectional switch structure comprises an IGBT semiconductor and a reverse diode, wherein the IGBT semiconductor and the reverse diode are connected in parallel.
7. The modulation method of a hybrid power electronic transformer based on three-phase matrix transformation according to claim 1, wherein: the step 1 is to collect input current, order the input current command, divide three input phases of the converter into a maximum phase, an intermediate phase and a minimum phase of command current, and order the input current command according to the following calculation formula:
in the method, in the process of the invention,instruction current maximum phase, intermediate phase and minimum phase respectively +.> And the input currents are respectively acquired by three phases a, b and c.
8. The modulation method of a hybrid power electronic transformer based on three-phase matrix transformation according to claim 1, wherein: the step 2 of sequencing the three-phase command current amplitude, dividing the three input phases of the converter into a command current amplitude maximum phase, an amplitude intermediate phase and an amplitude minimum phase, and sequencing the three-phase command current amplitude according to the calculation formula:
in |i * | max 、|i * | mid 、|i * | min The maximum amplitude phase, the intermediate amplitude phase and the minimum amplitude phase of the command current are respectively adopted,and the input current amplitude values are respectively acquired for the a phase, the b phase and the c phase.
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