CN102185337B - Grid stimulating device - Google Patents
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- CN102185337B CN102185337B CN 201110116468 CN201110116468A CN102185337B CN 102185337 B CN102185337 B CN 102185337B CN 201110116468 CN201110116468 CN 201110116468 CN 201110116468 A CN201110116468 A CN 201110116468A CN 102185337 B CN102185337 B CN 102185337B
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Abstract
The invention relates to a grid stimulating device which comprises a coupling transformer and at least two inverters, wherein an output fire wire of the inverter A is independently connected with one ends of primary windings of a coupling coil group of the coupling transformer respectively, and the other ends of the connected primary winding or connected series-connected primary winding are connected with an output fire wire of the grid stimulating device; the output ends of other inverters are in respectively independent closed connection with secondary windings of the coupling coil group which is connected with the fire wire of the inverter A, of the coupling transformer; and in the inverters, the output voltage of at least one inverter comprises a fundamental voltage component, and the output voltage of at least one inverter comprises a harmonic voltage component. The invention obviously reduces the switching loss and manufacture cost of the inverters and reduces the manufacture cost of the coupling transformer, thereby effectively reducing the manufacture difficulty and manufacture cost of the grid stimulating device containing harmonic voltage component output and meeting the requirement on the high-capacity grid stimulating device.
Description
Technical field
The present invention relates to a kind of analogue means, be specifically related to a kind of grid stimulating device.
Background technology
Along with the extensive use of all kinds of electric equipments such as generating, transmission of electricity and electricity consumption, grid adaptability becomes the important content that electric equipment detects.Grid adaptability detects the detection generally include contents such as the deviation of line voltage, frequency and flickering, unbalanced source voltages, and more complete grid adaptability detects and also comprises the adaptive Detection of content of mains by harmonics.Because the factors such as the deviation of electrical network and distortion have very large contingency and uncontrollability, grid adaptability detects generally needs the grid stimulating device of configure dedicated to carry out.Grid stimulating device is generally a voltage source, and its output voltage can be divided into first-harmonic part and harmonic wave part on frequency, and harmonic wave partly comprises the several times harmonic wave, and the frequency of harmonic wave is the integral multiple of first-harmonic (this integer is the number of times of harmonic wave).According to concrete needs, the harmonic wave part can further be divided into some groups according to its number of times, such as 2～7 subharmonic, and 8～25 subharmonic etc.
As shown in Figure 1, existing a kind of electrical network analogue system commonly used is voltage falling generator 10(VSG-Voltage Sag Generator), this device comprises based on a plurality of taps of a plurality of transformers or transformer and connection in series-parallel impedance network and machinery or electronic switch combination.This voltage falling generator can simulating grid voltage variation, but function singleness can't change by analog frequency, can't flexible voltage, also can't output harmonic wave.
In order to solve the deficiency of existing voltage falling generator, the voltage disturbance generator (VDG-Voltage Disturbance Generator) based on the Technics of Power Electronic Conversion technology has appearred.Voltage disturbance generator 20 is generally the basic transformation device (wherein comprising crucial inverter section 21) of a cover AC-DC-interchange, as shown in Figure 2, perhaps adopt many cover AC-DC-AC converter to be combined into three-phase system, perhaps be cascaded into more high voltage or a more jumbo converting means.Because three combined or inverter cascades of inverter can think to be the simple extension of single covering device, so still can think in logic to adopt a cover inverter.But the variation of voltage disturbance generator simulating grid voltage and frequency can realize step-less adjustment, also exportable fractional harmonic.
But still there are the following problems for existing voltage disturbance generator:
1, adopt a cover inverter (perhaps many cover inverters cascade) export simultaneously first-harmonic part and harmonic wave partly can be remarkable the switching loss of increasing system, seriously restrict the further expansion of inverter capacity.In the testing standards such as IEC, because the amplitude of the first-harmonic of line voltage part is higher than the amplitude of harmonic wave part far away, after connecting Devices to test work, the amplitude of general fundamental current also is higher than the amplitude of harmonic wave part far away.Based on the pulse-width modulation PWM principle, the switching frequency of inverter generally is required to be more than tens times of its output voltage frequency, and its modulation voltage is through behind output filter like this, could export sinusoidal degree preferably and than the output voltage of high control precision.For example, suppose that the fundamental voltage frequency that inverter need be exported is 50Hz, the switching frequency of its power semiconductor can be 3kHz, and this moment, exportable harmonic wave part generally was no more than (being 350Hz) 7 times, and the corner frequency of its output LC filter can be set to about 700Hz.If need inverter to export the more harmonic components of high order, such as 25 subharmonic (being 1250Hz), the switching frequency that then generally needs to promote its power semiconductor to 12kHz or more than, and corner frequency of adjusting its output LC filter is to the 3kHz.Consequently, in order to support harmonic wave, the switching loss, the particularly loss corresponding with larger fundamental current part of the higher remarkable increasing of power semiconductor switching device frequency meeting system seriously restrict the further expansion of inverter capacity after the adjustment;
2, simultaneously, adopt a cover inverter (perhaps many cover inverters cascade) export simultaneously first-harmonic part and harmonic wave partly can be remarkable difficulty and the cost of increasing system manufacturing.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of grid stimulating device is provided, overcome the system switching loss that existing voltage disturbance generator VDG exists high, seriously restrict large, the high in cost of production defective of further expansion, system's manufacture difficulty of inverter capacity, satisfy the demand for development that the electric equipment grid adaptability detects.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of grid stimulating device, it is characterized in that, comprise coupling transformer and at least two inverters;
The output live wire of a described inverter A is an end of the former limit winding of the coupling coil group of the described coupling transformer of separate connection respectively, is connected former limit winding or the other end of the former limit winding of the mutual series connection that is connected is connected to the output live wire of described grid stimulating device;
The output of other described inverters respectively independent closure connects described coupling transformer by the secondary winding of the described coupling coil group of the live wire of described inverter A connection;
In described inverter, comprise the fundamental voltage composition in the output voltage of at least one inverter, comprise the harmonic voltage composition in the output voltage of at least one inverter.
In grid stimulating device of the present invention, described inverter is single-phase inverter, the output live wire of described inverter A connects former limit winding one end of the coupling coil group of described coupling transformer, the other end of the former limit winding of the mutual series connection that is connected former limit winding or is connected is connected to the output live wire of described grid stimulating device, and the output zero line of described inverter A is connected to the output zero line of described grid stimulating device;
The output live wire of other described inverters be connected the respectively two ends of the secondary winding of the described coupling coil group that connected by the live wire of described inverter A of the described coupling transformer of separate connection of zero line.
In grid stimulating device of the present invention, the quantity of the coupling coil group of the described coupling transformer that the live wire of described inverter A connects is one or more, and the quantity of other described inverters that connects the secondary winding of the described coupling coil group that is connected by described inverter A corresponds to one or corresponding a plurality of.
In grid stimulating device of the present invention, described inverter comprises DC link, half-bridge converter and single phase filter.
In grid stimulating device of the present invention, described inverter adopts inverter structure one, this inverter structure one comprises: described DC link comprises the dc capacitor group of two groups of equities of series connection, described half-bridge converter comprises the power semiconductor switch of two series connection, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point of described DC link connects the output zero line, the mid point of described half-bridge converter connects described single phase filter, mid point, the other end that described filter reactance one end connects described half-bridge converter connects described filter capacitor group and output live wire, described filter capacitor group one end connects described filter reactance and described output live wire, and the other end connects described DC link mid point and described output zero line;
Or described inverter adopts inverter structure two, this inverter structure two comprises: described DC link comprises the dc capacitor group, described half-bridge converter comprises two brachium pontis, each brachium pontis comprises two power semiconductor switches that are in series, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point that the mid point of a brachium pontis of described half-bridge converter connects described filter reactance, another brachium pontis connects described filter capacitor and output zero line, described filter reactance one end connects the mid point of a brachium pontis of described half-bridge converter, the other end connects filter capacitor group and output live wire, described filter capacitor group one end connects this filter reactance and described output live wire, and the other end connects mid point and the described output zero line of another brachium pontis of described half-bridge converter;
Or described inverter adopts inverter structure one and inverter structure two.
In grid stimulating device of the present invention, described inverter A is three-phase inverter, each bar live wire of this inverter A is an end of the former limit winding of the coupling coil group of the described coupling transformer of separate connection respectively, the other end of the former limit winding of the mutual series connection that is connected former limit winding or is connected is connected to the output live wire of described grid stimulating device, and the output zero line of described inverter A is connected to the output zero line of described grid stimulating device.
In grid stimulating device of the present invention, described inverter A adopts inverter structure three, this inverter structure three comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, the mid point of described DC link connects the output zero line, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively described filter capacitor group and output live wire, and described three filter capacitor group one ends connect separately respectively described filter reactance group and output live wire, the other end connects described DC link mid point and output zero line;
Other described inverters adopt inverter structure one, this inverter structure one comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described half-bridge converter comprises the power semiconductor switch of two series connection, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point of described DC link connects the output zero line, the mid point of described half-bridge converter connects described single phase filter, mid point, the other end that described filter reactance one end connects described half-bridge converter connects described filter capacitor group and output live wire, described filter capacitor group one end connects described filter reactance and described output live wire, and the other end connects described DC link mid point and described output zero line;
Or other described inverters adopt inverter structure two, this inverter structure two comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group, described half-bridge converter comprises two brachium pontis, each brachium pontis comprises two power semiconductor switches that are in series, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point that the mid point of a brachium pontis of described half-bridge converter connects described filter reactance, another brachium pontis connects described filter capacitor and output zero line, described filter reactance one end connects the mid point of a brachium pontis of described half-bridge converter, the other end connects filter capacitor group and output live wire, described filter capacitor group one end connects this filter reactance and described output live wire, and the other end connects mid point and the described output zero line of another brachium pontis of described half-bridge converter;
Or other described inverters adopt described inverter structure one and described inverter structure two;
Or other described inverters adopt described inverter structure three;
Or other described inverters adopt described inverter structure four, this inverter structure four comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively the output live wire, and described three filter capacitor groups are connected across separately respectively described output live wire and fail.
In grid stimulating device of the present invention, described inverter A is three-phase inverter, the live wire of this inverter A is an end of the former limit winding of the coupling coil group of the described coupling transformer of separate connection respectively, is connected former limit winding or the other end of the former limit winding of the mutual series connection that is connected is connected to the output live wire of described grid stimulating device.
In grid stimulating device of the present invention, described inverter A adopts inverter structure four, this inverter structure four comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively the output live wire, and described three filter capacitor groups are connected across separately respectively on the described output live wire;
Other described inverters adopt inverter structure one, this inverter structure one comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described half-bridge converter comprises the power semiconductor switch of two series connection, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point of described DC link connects the output zero line, the mid point of described half-bridge converter connects described single phase filter, mid point, the other end that described filter reactance one end connects described half-bridge converter connects described filter capacitor group and output live wire, described filter capacitor group one end connects described filter reactance and described output live wire, and the other end connects described DC link mid point and described output zero line;
Or other described inverters adopt inverter structure two, this inverter structure two comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group, described half-bridge converter comprises two brachium pontis, each brachium pontis comprises two power semiconductor switches that are in series, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point that the mid point of a brachium pontis of described half-bridge converter connects described filter reactance, another brachium pontis connects described filter capacitor and output zero line, described filter reactance one end connects the mid point of a brachium pontis of described half-bridge converter, the other end connects filter capacitor group and output live wire, described filter capacitor group one end connects this filter reactance and described output live wire, and the other end connects mid point and the described output zero line of another brachium pontis of described half-bridge converter;
Or other described inverters adopt described inverter structure one and described inverter structure two;
Or other described inverters adopt described inverter structure four;
Or other described inverters adopt described inverter structure three, this inverter structure three comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, the mid point of described DC link connects the output zero line, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively described filter capacitor group and output live wire, and described three filter capacitor group one ends connect separately respectively described filter reactance group and output live wire, the other end connects described DC link mid point and output zero line.
In grid stimulating device of the present invention, the switching frequency of described inverter is at least two kinds of frequencies.
Implement grid stimulating device of the present invention, compared with the prior art, its beneficial effect is:
1. grid stimulating device adopts at least two inverters that connect by coupler, the inverter capacity that output fundamental voltage composition can be set is larger, and adopt relatively low switching frequency, the inverter capacity that output higher harmonic voltage composition is set is less, and the relatively high switching frequency of employing, significantly reduce switching loss and the manufacturing cost of inverter, be beneficial to the further expansion of inverter capacity;
2. the voltage drop of coupling transformer is mainly the harmonic voltage part, and proportion is less, and the coupling transformer desired volume is less, and manufacturing cost is lower;
3. effectively reduce manufacture difficulty and the manufacturing cost of the grid stimulating device that comprises the output of harmonic voltage composition, satisfy the requirement of large capacity grid stimulating device.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of existing a kind of electrical network analogue system voltage falling generator VSG.
Fig. 2 is the structural representation of existing another kind of electrical network analogue system voltage disturbance generator VDG.
Fig. 3 is the basic principle schematic of grid stimulating device of the present invention.
Fig. 4 is the principle schematic of grid stimulating device embodiment one of the present invention.
Fig. 5 is the structure chart of a kind of execution mode of inverter among the grid stimulating device embodiment one of the present invention.
Fig. 6 is the principle schematic of grid stimulating device embodiment two of the present invention.
Fig. 7 is the structure chart of a kind of execution mode of inverter among the grid stimulating device embodiment two of the present invention.
Fig. 8 is the principle schematic of grid stimulating device embodiment three of the present invention.
Fig. 9 is the structure chart of a kind of execution mode of inverter among the grid stimulating device embodiment three of the present invention.
Figure 10 is the principle schematic of grid stimulating device embodiment four of the present invention.
Figure 11 is the structure chart of a kind of execution mode of inverter among the grid stimulating device embodiment four of the present invention.
Figure 12 to 14 is three kinds of execution modes of inverter direct-flow input circuit in the grid stimulating device of the present invention.
Figure 15 to 17 is three kinds of configuration modes of inverter direct current input in the grid stimulating device of the present invention.
Figure 18 to 20 is three kinds of configuration modes of circuit control device in the grid stimulating device of the present invention.
Embodiment
As shown in Figure 3, the present invention is that grid stimulating device comprises coupling transformer 303 and at least two inverters 301,302, wherein:
Inverter A(such as inverter 301 or inverter 302) an output live wire end of the former limit winding of the coupling coil group of separate connection coupling transformer 303 (" respectively separate connection " refers to that every live wire of inverter A connects respectively the former limit winding of different coupling coil groups or the former limit winding of different one group of a plurality of coupling coil group of mutually connecting separately) respectively, be connected former limit winding or the other end of a plurality of former limit of the mutual series connection winding that is connected is connected to the output live wire of grid stimulating device.The coupling coil group quantity of coupling transformer 303 can be one, and is two or more.Coupling transformer 303 does not herein refer to the coupling transformer on the physical significance, and refers to realize the device of voltage coupling, and therefore, coupling transformer 303 can comprise the coupling transformer on a plurality of physical significances.
(" respectively independent closed the connection " refers to that the secondary winding of the coupling coil group of the coupling transformer 303 that other inverter output ends are connected by the live wire of inverter A with coupling transformer respectively connects into the closed-loop path to the secondary winding of the coupling coil group that the respectively independent closed butt coupling transformer of other inverter output ends in the inverter except inverter A is connected by the live wire of inverter A, can be the two ends that two live wires of other inverters connect this secondary winding, also can be a live wire of other inverters is connected this secondary winding with zero line two ends).
In the inverter of grid stimulating device of the present invention, comprise the fundamental voltage composition in the output voltage of at least one inverter, comprise the harmonic voltage composition in the output voltage of at least one inverter.Like this, with fundamental voltage composition and the coupling of harmonic voltage composition, obtain the output voltage with fundamental voltage composition and harmonic voltage composition by coupling transformer 303.
The output of grid stimulating device connects Devices to test 304.
Below describe with specific embodiment.
Embodiment one
As shown in Figure 4, grid stimulating device of the present invention comprises two single- phase inverters 11,12 and coupling transformer 13, and coupling transformer 13 comprises a coupling coil group M1.Former limit winding one end of the coupling coil group M1 of the output live wire L1 butt coupling transformer 13 of inverter 11, the other end of the former limit winding of coupling coil group M1 is connected to the output live wire of grid stimulating device, the input live wire L that connects Devices to test 14, the secondary winding two ends of the output live wire L2 of inverter 12 and output zero line N2 butt coupling transformer 13, the output zero line N1 of inverter 11 is the output zero line of grid stimulating device, connects the input zero line N of Devices to test 14.
If the output voltage of inverter 11 and inverter 12 is respectively V1, V2, output current is respectively I1, I2, the voltage and current of Devices to test 14 is respectively Vo, Io, the no-load voltage ratio of coupling transformer 13 is n2:n1=k, leakage inductance and the exciting curent of ignoring coupling transformer 13, according to voltage superposition law and transformer based present principles as can be known: Vo=V1+V2/k, I1=Io, I2=Io/k.
If the output capacity of grid stimulating device is 200kVA, fundamental frequency is 50Hz, and the first-harmonic effective value of output voltage is 200V, and to be that 2～25(is the highest be not limited to 25 times required harmonic wave, lower with) inferior, its cumulative magnitude is no more than 10% of first-harmonic.The output current of grid stimulating device is mainly the first-harmonic composition, calculates by first-harmonic and is approximately 200kVA/200V=1000A.Suppose that inverter 11 and inverter 12 bear respectively the output of fundamental voltage and harmonic voltage, and its output voltage all can reach 200V, according to the above-mentioned relation formula, select k=10, then: I1=Io ≈ 1000A, I2=Io/k=Io/10 ≈ 100A.
The output current of inverter 11 is about 1000A, and its capacity is about 200Vx1000A=200kVA; The output current of inverter 12 is about 100A, and its capacity is about 200Vx100A=20kVA.Like this, the output current of inverter 12 and capacity all are about inverter 11 or whole grid stimulating device 1/10 times.Equally, the capacity of coupling transformer 13 can be calculated as follows by its former limit winding: the voltage of former limit winding is reduced to V2/k=200V/10=20V, and primary current is I ≈ 1000A, and its capacity is about 20Vx1000A=20kVA.So the capacity of coupling transformer 13 also is about 1/10 times of inverter 11 or whole grid stimulating device.
The single-phase inverter 11 of present embodiment, 12 adopts the structure of single-phase inverter 1000 as shown in Figure 5: this single-phase inverter 1000 comprises DC link 1100, half-bridge converter 1200 and single phase filter 1300, DC link 1100 comprises reciprocity dc capacitor group Cdc1 and the Cdc2 that is in series, DC link 1100 two ends connect the input of half-bridge converter 1200, and the mid point N0 of DC link 1100 connects output zero line Ni simultaneously.Half-bridge converter 1200 comprises power semiconductor switch Q1 and the Q2 of series connection, and the mid point P of half-bridge converter 1200 connects single phase filter.Single phase filter 1300 comprises filter reactance Lf and filter capacitor group Cf, and wherein, mid point P, the other end that filter reactance Lf one end connects half-bridge converter 1200 connect filter capacitor group Cf and output live wire Li; Filter capacitor group Cf one end connects filter reactance Lf and is connected mid point N0 and the output zero line Ni of live wire Li, other end connection DC link 1100.
In other embodiments, single- phase inverter 11,12 also can adopt the structure of single-phase inverter 2000 as shown in Figure 7: this single-phase inverter 2000 comprises DC link 2100, half-bridge converter 2200 and single phase filter 2300, DC link 2100 comprises dc capacitor group Cdc, and its two ends connect half-bridge converter 2200.Half-bridge converter 2200 comprises two brachium pontis, and each brachium pontis is made of two power semiconductor switch series connection respectively, and single phase filter 2300 comprises filter reactance Lf and filter capacitor group Cf.The mid point P1 of a brachium pontis of half-bridge converter 2200 connects the filter reactance Lf in the single phase filter 2300, and the mid point P2 of another brachium pontis connects filter capacitor Cf and the output zero line Ni in the single phase filter 2300; Filter reactance Lf one end of single phase filter 2300 connects the brachium pontis mid point P1 of half-bridge converter, and the other end connects filter capacitor group Cf and output live wire Li; Filter capacitor group Cf one end connects filter reactance Lf and output live wire Li, and the other end connects brachium pontis mid point P2 and the output zero line Ni of half-bridge converter 2200.
In other embodiments, single- phase inverter 11,12 can adopt respectively the structure (seeing above-mentioned) of single-phase inverter 1000 as shown in Figure 5 and the structure (seeing above-mentioned) of single-phase inverter as shown in Figure 7 2000.
Single- phase inverter 11,12 adoptable inverter structures include but not limited to the inverter structure of above-mentioned single-phase inverter 1000, single-phase inverter 2000.
Embodiment two
As shown in Figure 6, grid stimulating device of the present invention comprises three single- phase inverters 21,22,23 and coupling transformer 24, and coupling transformer 24 comprises two coupling coil group M1 and M2.The former limit winding n1 that output live wire L1 butt coupling transformer 24 two coupling coil groups M1 of inverter 21 and M2 connect mutually, the end of n3, the former limit winding n1 of series connection, the other end of n3 are connected to the live wire output of grid stimulating device mutually, connect the input live wire L of Devices to test 25; The output zero line N1 of inverter 21 is the zero line output of grid stimulating device, connects the input zero line N of Devices to test 25.The secondary winding n2 two ends of the output live wire L2 of inverter 22 and output zero line N2 butt coupling coil groups M1, the secondary winding n4 two ends of the output live wire L3 of inverter 23 and output zero line N3 butt coupling coil groups M2.
If inverter 21,22,23 output voltage are respectively V1, V2, V3, output current is respectively I1, I2, I3, the voltage and current of Devices to test 25 is respectively Vo, Io, the no-load voltage ratio of the coupling coil group M1 of coupling transformer 24 is n2:n1=k, and the no-load voltage ratio of coupling coil group M2 is n4:n3=m, ignores leakage inductance and the exciting curent of coupling transformer 24, according to voltage superposition law and transformer based present principles as can be known: Vo=V1+V2/k+V3/m, I1=Io, I2=Io/k, I3=Io/m.
If the output capacity of grid stimulating device is 200kVA, fundamental frequency is 50Hz, and the first-harmonic effective value of output voltage is 200V.Required harmonic wave is 2 ~ 25 times, wherein the cumulative magnitude of 2 ~ 10 times low-order harmonic be no more than first-harmonic 10%, 11 ~ 25 high order harmonic components cumulative magnitude be no more than 5% of first-harmonic.The output current of grid stimulating device is mainly the first-harmonic composition, and numerical value calculates by first-harmonic and is approximately 200kVA/200V=1000A.Suppose that inverter 21,22,23 bears respectively the output of the harmonic voltage of fundamental voltage, 2 ~ 10 times low-order harmonic voltage and 11 ~ 25 times; and its output voltage all can reach 200V; get k=10; m=20; according to above-mentioned relation Shi Kede: I1=Io ≈ 1000A; I2=Io/k=Io/10 ≈ 100A, I3=Io/m=Io/20 ≈ 50A.
The output current of inverter 21 is about 1000A, and its capacity is about 200Vx1000A=200kVA; The output current of inverter 22 is about 100A, and its capacity is about 200Vx100A=20kVA; The output current of inverter 23 is about 50A, and its capacity is about 200Vx50A=10kVA.Like this, the output current of inverter 22 and capacity are inverter 21 or whole grid stimulating device 1/10 times, and the output current of inverter 23 and capacity are inverter 21 or whole grid stimulating device 1/20 times.Equally, the capacity of the coupling coil group M1 of coupling transformer 24 can be calculated as follows by its former limit winding: the voltage of former limit winding is reduced to V2/k=200V/10=20V, and primary current is Io ≈ 1000A, so its capacity is about 20Vx1000A=20kVA.So coupling coil group M1 capacity is about 1/10 times of inverter 21 or whole grid stimulating device.Coupling coil group M2 capacity can be calculated as follows by its former limit winding: the voltage of former limit winding is reduced to V3/m=200V/20=10V, and primary current is Io ≈ 1000A, so its capacity is about 10Vx1000A=10kVA.So coupling coil group M2 capacity is about 1/20 times of inverter 21 or whole grid stimulating device.
The single-phase inverter 21,22 of present embodiment, 23 adopts the structure (seeing above-mentioned) of single-phase inverter 2000 as shown in Figure 7.In other embodiments, single- phase inverter 21,22,23 can adopt the structure (seeing above-mentioned) of single-phase inverter 1000 as shown in Figure 5.In other embodiments, single- phase inverter 21,22,23 can adopt the structure of single-phase inverter 1000 as shown in Figure 5 and the structure of single-phase inverter as shown in Figure 7 2000.Single- phase inverter 21,22,23 adoptable inverter structures include but not limited to the inverter structure of above-mentioned single-phase inverter 1000, single-phase inverter 2000.
In other embodiments, grid stimulating device can comprise coupling transformer and four single-phase inverters, coupling transformer comprises three coupling coil groups, former limit winding one end of three coupling coil groups of live wire butt coupling transformer of a single-phase inverter A, the other end of the former limit of coupling transformer winding is connected to the live wire output of grid stimulating device, the zero line of this single-phase inverter A is the zero line output of grid stimulating device, and the live wire of other single-phase inverters except single-phase inverter A and zero line be the secondary winding of separate connection coupling transformer coupling coil group respectively.
In like manner, in other embodiments, grid stimulating device can comprise coupling transformer and N single-phase inverter, and coupling transformer comprises N-1 coupling coil group, the connected mode of single-phase inverter and coupling transformer such as above-mentioned.
Embodiment three
As shown in Figure 8, grid stimulating device of the present invention comprises that coupling transformer 33 and two three-phases have zero line inverter 31,32.Coupling transformer 33 comprises three coupling coil group M1, M2, M3, can adopt physically three independently O shaped iron cores, also can adopt an E shaped iron core.
The output live wire L11 of inverter 31, L21, L31 be former limit winding one end of 33 3 coupling coil groups of butt coupling transformer M1, M2, M3 respectively, the former limit winding other end of three coupling coil group M1, M2, M3 is connected to respectively three output live wires of grid stimulating device, connect input live wire L1, L2, the L3 of Devices to test 34, the zero line N1 of inverter 31 is the output zero line N of grid stimulating device; The secondary winding of 33 3 coupling coil groups of coupling transformer M1, M2, M3 is connected between output live wire L12, L22, L32 and the output zero line N2 of inverter 32.
In the present embodiment, the former limit winding quantity of the output live wire L11 of inverter 31, the coupling coil group that L21, L31 connect respectively equates, is symmetrical structure.In other embodiments, the former limit winding quantity of the output live wire L11 of inverter 31, the coupling coil group that L21, L31 connect respectively can be unequal, is unsymmetric structure, also can realize the object of the invention.
If the output phase voltage of inverter 31 and inverter 32 is respectively V1, V2, output current is respectively I1, I2, the phase voltage of Devices to test 34 and electric current are respectively Vo, Io, the no-load voltage ratio n2:n1=k of coupling transformer 33, leakage inductance and the exciting curent of ignoring coupling transformer, according to voltage superposition law and transformer based present principles as can be known: Vo=V1+V2/k, I1=Io, I2=Io/k.
If the output capacity of grid stimulating device is 600kVA, fundamental frequency is 50Hz, and the first-harmonic effective value of output phase voltage is 400V, and required harmonic wave is 2 ~ 25 times, and its cumulative magnitude is no more than 10% of first-harmonic.The electric current of grid stimulating device is mainly the first-harmonic composition, and numerical value calculates by first-harmonic and is approximately 600kVA/3/400V=500A.If inverter 31 and inverter 32 are born respectively the output of fundamental voltage and harmonic voltage, and its output phase voltage all can reach 400V, gets k=10, according to above-mentioned relation Shi Kede: I1=Io ≈ 500A, I2=Io/k=Io/10 ≈ 50A.
The output current of inverter 31 is about 500A, and its capacity is about 400Vx500Ax3=600kVA; The output current of inverter 32 is about 50A, and its capacity is about 400Vx50Ax3=60kVA.Like this, the output current of inverter 32 and capacity are inverter 31 or whole grid stimulating device 1/10 times.Equally, the capacity of a coupling coil group of coupling transformer 33 can be calculated as follows by its former limit winding: the voltage of former limit winding is reduced to V2/k=400V/10=40V, primary current is I1 ≈ 500A, so its capacity is about 40Vx500A=20kVA, so the cumulative capacity of three coupling coil groups of coupling transformer M1, M2, M3 also is about 1/10 times of inverter 31 or whole grid stimulating device.
In the present embodiment, three-phase has zero line inverter 31,32 to adopt three-phase as shown in Figure 9 that the zero line inverter structure is arranged, this three-phase has zero line inverter 3000 to comprise DC link 3100, three phase inverter bridge 3200 and Three-phase electric-wave filter 3300, DC link 3100 comprises reciprocity dc capacitor group Cdc1 and the Cdc2 that is in series, the two ends of DC link 3100 connect the input of three phase inverter bridge 3200, and the mid point N0 of DC link 3100 connects output zero line Ni.Three phase inverter bridge 3200 comprises three brachium pontis, each brachium pontis is made of two power semiconductor switch series connection respectively, Three-phase electric-wave filter 3300 comprises filter reactance Lf1, Lf2, Lf3 and filter capacitor group Cf1, Cf2, Cf3, and mid point P1, P2, the P3 of 3,200 three brachium pontis of three phase inverter bridge connects respectively filter reactance Lf1, Lf2, the Lf3 in the Three-phase electric-wave filter.The filter reactance Lf1 of Three-phase electric-wave filter 3300, Lf2, Lf3 one end connect respectively mid point P1, P2, the P3 of three phase inverter bridge 3200, and the other end connects respectively filter capacitor group Cf1, Cf2, Cf3 and output live wire L1i, L2i, L3i; Filter capacitor group Cf1, Cf2, Cf3 one end connect respectively filter reactance Lf1, Lf2, Lf3 and output live wire L1i, L2i, L3i, 3100 mid point N0 and output zero line Ni in the other end connection DC link.
In other embodiments, three-phase has zero line inverter 32 can adopt three single-phase inverters to replace, the single-phase inverter that adopts adopts the structure (seeing above-mentioned) of single-phase inverter 1000 as shown in Figure 5, also can adopt the structure (seeing above-mentioned) of single-phase inverter 2000 as shown in Figure 7, or the structure that had both adopted single-phase inverter 1000 as shown in Figure 5 also adopts the structure of single-phase inverter 2000 as shown in Figure 7, all can realize the object of the invention.The single-phase inverter structure that adopts includes but not limited to the inverter structure of above-mentioned single-phase inverter 1000, single-phase inverter 2000.
In other embodiments, three-phase has zero line inverter 32 can adopt three-phase as shown in figure 11 to replace without the zero line inverter structure, at this moment, three coupling coil group M1 of coupling transformer 33, the secondary winding of M2, M3 are connected to three-phase without the output live wire L12/L22 of zero line inverter, between L22/L32 and the L32/L12.
As shown in figure 11, three-phase comprises DC link 4100 without zero line inverter 4000, three phase inverter bridge 4200 and Three-phase electric-wave filter 4300, DC link 4100 comprises dc capacitor group Cdc, its two ends connect three phase inverter bridge 4200, three phase inverter bridge 4200 comprises three brachium pontis, each brachium pontis is made of two power semiconductor switch series connection, Three-phase electric-wave filter 4300 comprises filter reactance Lf1, Lf2, Lf3 and filter capacitor group Cf1, Cf2, Cf3, the mid point P1 of 4,200 three brachium pontis of three phase inverter bridge, P2, P3 connects respectively the filter reactance Lf1 of Three-phase electric-wave filter 4300, Lf2, Lf3; The filter reactance Lf1 of Three-phase electric-wave filter 4300, Lf2, Lf3 one end connect respectively mid point P1, P2, the P3 of three phase inverter bridge 4200, and the other end connects respectively filter capacitor group Cf1, Cf2, Cf3 and output live wire L1i, L2i, L3i; Filter capacitor group Cf1, Cf2, Cf3 are connected across respectively between output live wire L1i/L2i, L2i/L3i, the L3i/L1i.
Embodiment four
As shown in figure 10, grid stimulating device of the present invention comprises that coupler transformer 43 and two three-phases are without zero line inverter 41,42.Coupling transformer 43 comprises three coupling coil group M1, M2, M3, can adopt physically three independently O shaped iron cores, also can adopt an E shaped iron core.
Wherein, one end of the coupling coil group M1 of the output live wire L11 of inverter 41, L21, L31 difference butt coupling transformer 43, the former limit winding of M2, M3, the former limit winding other end of three coupling coil group M1, M2, M3 is connected to respectively three output live wires of grid stimulating device, connects respectively input live wire L1, L2, the L3 of Devices to test 44; The secondary winding of coupling coil group M1, M2, M3 is connected to the output live wire L12/L22 of inverter 42, between L22/L32 and the L32/L12.
If the output line voltage of inverter 411 and inverter 42 is respectively V1, V2, output current is respectively I1, I2, the line voltage and current of Devices to test 44 is respectively Vo and Io, if the no-load voltage ratio of coupling transformer 43 is n2:n1=k, leakage inductance and the exciting curent of ignoring coupling transformer, take the line voltage between the L1_L2 as example, can get according to voltage superposition law and transformer based present principles:
Vo
_L1_L2=V1
_L1_L2+V2
_L1_L2/k-V2
_L2_L3/k
=V1
_L1_L2+(V2
_L1_L2-V2
_L2_L3)/k
I1=Io，I2=Io/k
Here, V2
_ L1_L2-V2
_ L2_L3With line voltage V2
_ L1_L2, V2
_ L2_L3Relation just like the relation of line voltage and phase voltage, so V2
_ L1_L2-V2
_ L2_L3Generally can be greater than line voltage V2 on effective value
_ L1_L2And V2
_ L2_L3Effective value.Like this, from the capacity design angle, can design according to following relational expression the effective value of inverter 42 output voltages: Vo＜=V1+V2/k
If the output capacity of grid stimulating device is 600kVA, fundamental frequency is 50Hz, and the first-harmonic effective value of output line voltage is 690V, and required harmonic wave is 2 ~ 25 times, wherein the cumulative magnitude of 2 ~ 7 subharmonic cumulative magnitude that is no more than 10%, 8 ~ 25 subharmonic of first-harmonic is no more than 5% of first-harmonic.The output current of grid stimulating device is mainly the first-harmonic composition, and numerical value calculates by first-harmonic and is approximately 600kVA/1.732/690V=502A.If inverter 41 is born the output of the low-order harmonic voltage of fundamental voltage and 2 ~ 7 times, and its output line voltage can reach 690V; Inverter 42 is born the output of 8 ~ 25 times higher harmonic voltage, and its output line voltage all can reach 345V, gets k=10, according to above-mentioned relation Shi Kede:
V2/k=345/10=690x5%=V1x5%
I1=Io≈502A；I2=Io/k=Io/10≈50A
The output current of inverter 41 is about 502A, and its capacity is about 690Vx502Ax1.732=600kVA; The output current of inverter 42 is about 50A, and its capacity is about 345Vx50Ax1.732=30kVA.Like this, the output current of inverter 42 is about inverter 41 or whole grid stimulating device 1/10 times, and its output capacity is about inverter 41 or whole grid stimulating device 1/20 times.Equally, the capacity of coupling transformer 43 can be calculated as follows by its former limit winding: the voltage of former limit winding is reduced to V1/1.732x5%=690/1.732x5%=20V, and primary current is I1 ≈ 502A, so its capacity is about 20Vx502A=10kVA.So the cumulative capacity of coupling transformer 43 is 1/20 times of inverter 41 or whole grid stimulating device.
In the present embodiment, three-phase adopts as shown in figure 11 three-phase without the inverter structure (seeing above-mentioned) of zero line inverter 4000 without zero line inverter 41,42, in other embodiments, three-phase can adopt three-phase as shown in Figure 9 to have the zero line inverter structure to replace without zero line inverter 42, at this moment, the secondary winding of three of coupling transformer 43 coupling coil group M1, M2, M3 is connected to three-phase has between output live wire L12, the L22 and L32 and zero line N2 of zero line inverter.
In other embodiments, three-phase can adopt three single-phase inverters to replace without zero line inverter 42, the single-phase inverter that adopts adopts the structure (seeing above-mentioned) of single-phase inverter 1000 as shown in Figure 5, also can adopt the structure (seeing above-mentioned) of single-phase inverter 2000 as shown in Figure 7, or the structure that had both adopted single-phase inverter 1000 as shown in Figure 5 also adopts the structure of single-phase inverter 2000 as shown in Figure 7, all can realize the object of the invention.The single-phase inverter structure that adopts includes but not limited to the inverter structure of above-mentioned single-phase inverter 1000, single-phase inverter 2000.
In the various embodiments described above, the switching frequency of each inverter can adopt same frequency, also can adopt different frequency, all can realize the object of the invention.When adopting different switching frequency, inverter such as main output first-harmonic or low-order harmonic voltage composition adopts lower switching frequency, be conducive to reduce its switching loss, thereby reduce manufacture difficulty and the manufacturing cost of whole grid stimulating device, satisfy the requirement of large capacity grid stimulating device.
In the various embodiments described above, the direct current input of each inverter can be fully independently, also can all share (namely all inverters share same direct current input), perhaps partial common (being that the part inverter shares same direct current input) is shown in Figure 12 to 14.
In the various embodiments described above, on control mode, each inverter can adopt separately independently controller to control respectively, also can unify control by the same set of controller of all or part of employing, shown in Figure 15 to 17.When adopting many cover controllers, generally also need between many cover controllers, the communication conditioning unit to be set.
In the various embodiments described above, the physics realization of corresponding controller can be adopted analog circuit, digital circuit or processor; The control model of corresponding controller can adopt open loop control, perhaps closed-loop control, and perhaps part adopts open loop control, and part adopts closed-loop control, shown in Figure 18 to 20.
In the various embodiments described above, grid stimulating device adopts a plurality of inverters and coupling transformer, can be according to the proportion requirement of different frequency composition in the output voltage, the inverter of different capabilities is set, and each inverter can adopt different switching frequencies and filter, ensureing under the prerequisite of output performance separately, can effectively reduce switching loss and manufacturing cost, thereby realize the optimal design of whole grid stimulating device.
Claims (10)
1. a grid stimulating device is characterized in that, comprises coupling transformer and at least two inverters;
The output live wire of a described inverter A is an end of the former limit winding of the coupling coil group of the described coupling transformer of separate connection respectively, is connected former limit winding or the other end of the former limit winding of the mutual series connection that is connected is connected to the output live wire of described grid stimulating device;
The output of other described inverters respectively independent closure connects described coupling transformer by the secondary winding of the described coupling coil group of the live wire of described inverter A connection;
In described inverter, comprise the fundamental voltage composition in the output voltage of at least one inverter, comprise the harmonic voltage composition in the output voltage of at least one inverter.
2. grid stimulating device as claimed in claim 1, it is characterized in that, described inverter is single-phase inverter, the output live wire of described inverter A connects former limit winding one end of the coupling coil group of described coupling transformer, the other end of the former limit winding of the mutual series connection that is connected former limit winding or is connected is connected to the output live wire of described grid stimulating device, and the output zero line of described inverter A is connected to the output zero line of described grid stimulating device;
The output live wire of other described inverters be connected the respectively two ends of the secondary winding of the described coupling coil group that connected by the live wire of described inverter A of the described coupling transformer of separate connection of zero line.
3. grid stimulating device as claimed in claim 2, it is characterized in that, the quantity of the coupling coil group of the described coupling transformer that the live wire of described inverter A connects is one or more, and the quantity of other described inverters that connects the secondary winding of the described coupling coil group that is connected by described inverter A corresponds to one or corresponding a plurality of.
4. grid stimulating device as claimed in claim 2 is characterized in that, described inverter comprises DC link, half-bridge converter and single phase filter.
5. grid stimulating device as claimed in claim 4, it is characterized in that, described inverter adopts inverter structure one, this inverter structure one comprises: described DC link comprises the dc capacitor group of two groups of equities of series connection, described half-bridge converter comprises the power semiconductor switch of two series connection, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point of described DC link connects the output zero line, the mid point of described half-bridge converter connects described single phase filter, mid point, the other end that described filter reactance one end connects described half-bridge converter connects described filter capacitor group and output live wire, described filter capacitor group one end connects described filter reactance and described output live wire, and the other end connects described DC link mid point and described output zero line;
Or described inverter adopts inverter structure two, this inverter structure two comprises: described DC link comprises the dc capacitor group, described half-bridge converter comprises two brachium pontis, each brachium pontis comprises two power semiconductor switches that are in series, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point that the mid point of a brachium pontis of described half-bridge converter connects described filter reactance, another brachium pontis connects described filter capacitor and output zero line, described filter reactance one end connects the mid point of a brachium pontis of described half-bridge converter, the other end connects filter capacitor group and output live wire, described filter capacitor group one end connects this filter reactance and described output live wire, and the other end connects mid point and the described output zero line of another brachium pontis of described half-bridge converter;
Or described inverter adopts inverter structure one and inverter structure two.
6. grid stimulating device as claimed in claim 1, it is characterized in that, described inverter A is three-phase inverter, each bar live wire of this inverter A is an end of the former limit winding of the coupling coil group of the described coupling transformer of separate connection respectively, the other end of the former limit winding of the mutual series connection that is connected former limit winding or is connected is connected to the output live wire of described grid stimulating device, and the output zero line of described inverter A is connected to the output zero line of described grid stimulating device.
7. grid stimulating device as claimed in claim 6, it is characterized in that, described inverter A adopts inverter structure three, this inverter structure three comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, the mid point of described DC link connects the output zero line, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively described filter capacitor group and output live wire, and described three filter capacitor group one ends connect separately respectively described filter reactance group and output live wire, the other end connects described DC link mid point and output zero line;
Other described inverters adopt inverter structure one, this inverter structure one comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described half-bridge converter comprises the power semiconductor switch of two series connection, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point of described DC link connects the output zero line, the mid point of described half-bridge converter connects described single phase filter, mid point, the other end that described filter reactance one end connects described half-bridge converter connects described filter capacitor group and output live wire, described filter capacitor group one end connects described filter reactance and described output live wire, and the other end connects described DC link mid point and described output zero line;
Or other described inverters adopt inverter structure two, this inverter structure two comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group, described half-bridge converter comprises two brachium pontis, each brachium pontis comprises two power semiconductor switches that are in series, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point that the mid point of a brachium pontis of described half-bridge converter connects described filter reactance, another brachium pontis connects described filter capacitor and output zero line, described filter reactance one end connects the mid point of a brachium pontis of described half-bridge converter, the other end connects filter capacitor group and output live wire, described filter capacitor group one end connects this filter reactance and described output live wire, and the other end connects mid point and the described output zero line of another brachium pontis of described half-bridge converter;
Or other described inverters adopt described inverter structure one and described inverter structure two;
Or other described inverters adopt described inverter structure three;
Or other described inverters adopt described inverter structure four, this inverter structure four comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively the output live wire, and described three filter capacitor groups are connected across separately respectively on the described output live wire.
8. grid stimulating device as claimed in claim 1, it is characterized in that, described inverter A is three-phase inverter, the live wire of this inverter A is an end of the former limit winding of the coupling coil group of the described coupling transformer of separate connection respectively, is connected former limit winding or the other end of the former limit winding of the mutual series connection that is connected is connected to the output live wire of described grid stimulating device.
9. grid stimulating device as claimed in claim 8, it is characterized in that, described inverter A adopts inverter structure four, this inverter structure four comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively the output live wire, and described three filter capacitor groups are connected across separately respectively on the described output live wire;
Other described inverters adopt inverter structure one, this inverter structure one comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described half-bridge converter comprises the power semiconductor switch of two series connection, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point of described DC link connects the output zero line, the mid point of described half-bridge converter connects described single phase filter, mid point, the other end that described filter reactance one end connects described half-bridge converter connects described filter capacitor group and output live wire, described filter capacitor group one end connects described filter reactance and described output live wire, and the other end connects described DC link mid point and described output zero line;
Or other described inverters adopt inverter structure two, this inverter structure two comprises DC link, half-bridge converter and single phase filter, described DC link comprises the dc capacitor group, described half-bridge converter comprises two brachium pontis, each brachium pontis comprises two power semiconductor switches that are in series, and described single phase filter comprises filter reactance and filter capacitor group; Described DC link two ends connect described half-bridge converter input, the mid point that the mid point of a brachium pontis of described half-bridge converter connects described filter reactance, another brachium pontis connects described filter capacitor and output zero line, described filter reactance one end connects the mid point of a brachium pontis of described half-bridge converter, the other end connects filter capacitor group and output live wire, described filter capacitor group one end connects this filter reactance and described output live wire, and the other end connects mid point and the described output zero line of another brachium pontis of described half-bridge converter;
Or other described inverters adopt described inverter structure one and described inverter structure two;
Or other described inverters adopt described inverter structure four;
Or other described inverters adopt described inverter structure three, this inverter structure three comprises DC link, three phase inverter bridge and Three-phase electric-wave filter, described DC link comprises the dc capacitor group of two groups of equities of series connection, described three phase inverter bridge comprises three brachium pontis, each described brachium pontis comprises the power semiconductor switch of two series connection, described Three-phase electric-wave filter comprises three filter reactance groups and three filter capacitor groups, described DC link two ends connect described three phase inverter bridge input, the mid point of described DC link connects the output zero line, filter reactance group in the described Three-phase electric-wave filter of mid point difference separate connection of three brachium pontis of described three phase inverter bridge, described three filter reactance group one ends connect separately respectively the mid point of described three phase inverter bridge, the other end connects separately respectively described filter capacitor group and output live wire, and described three filter capacitor group one ends connect separately respectively described filter reactance group and output live wire, the other end connects described DC link mid point and output zero line.
10. such as the described grid stimulating device of one of claim 1 to 9, it is characterized in that the switching frequency of described inverter is at least two kinds of frequencies.
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| CN106950512B (en) * | 2017-02-14 | 2022-01-18 | 中国电力科学研究院 | Energy storage converter grid-connected and grid-disconnected characteristic integrated detection system and method |
| CN107332231A (en) * | 2017-06-13 | 2017-11-07 | 合肥工业大学 | Suitable for MW grades of high-power grid simulator topological structure |
| CN107294095B (en) * | 2017-06-20 | 2019-09-10 | 合肥工业大学 | System and control method with harmonic voltage generation and ZIP virtual load |
| CN113054855B (en) * | 2021-03-11 | 2022-12-02 | 机械工业第九设计研究院股份有限公司 | Source-complementary mutual-aid power supply for simulating voltage swing and control method |
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| CN101064479A (en) * | 2007-01-11 | 2007-10-31 | 西安交通大学 | Superposition principle based programmable harmonic voltage source for large power test |
| CN101464501A (en) * | 2007-12-20 | 2009-06-24 | 上海联能仪表有限公司 | Calibrating apparatus for electric energy quality test analyzer |
| CN101692112A (en) * | 2009-09-07 | 2010-04-07 | 东南大学 | High-power electric energy quality signal generator for testing 400Hz electric equipment |
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| CN101064479A (en) * | 2007-01-11 | 2007-10-31 | 西安交通大学 | Superposition principle based programmable harmonic voltage source for large power test |
| CN101464501A (en) * | 2007-12-20 | 2009-06-24 | 上海联能仪表有限公司 | Calibrating apparatus for electric energy quality test analyzer |
| CN101692112A (en) * | 2009-09-07 | 2010-04-07 | 东南大学 | High-power electric energy quality signal generator for testing 400Hz electric equipment |
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