CN204720981U - A kind of three phase network disturbing generating device - Google Patents
A kind of three phase network disturbing generating device Download PDFInfo
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- CN204720981U CN204720981U CN201520442435.1U CN201520442435U CN204720981U CN 204720981 U CN204720981 U CN 204720981U CN 201520442435 U CN201520442435 U CN 201520442435U CN 204720981 U CN204720981 U CN 204720981U
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Abstract
A kind of three phase network disturbing generating device, comprises the three-phase multi winding transformer, power model array and the output filter that connect successively; Power model array comprises three groups of power models that corresponding three-phase exports, and each power model comprises the Three-Phase PWM Rectifier, DC bus link and the single-phase H bridge inverter that connect successively; Three-Phase PWM Rectifier input connects the corresponding secondary three-phase windings of three-phase multi winding transformer, and DC bus link comprises DC capacitor group, and single-phase H bridge inverter output cascade forming apparatus exports substantially; Often organize power model to comprise at least one and export first-harmonic or first-harmonic and add the low-frequency excitation generation power model of harmonic wave and the high frequency components generation power model of at least one output harmonic wave.Three phase network disturbing generating device volume of the present utility model is little, cost is low, is applicable to the requirement of vehicle-carried mobile Site Detection.
Description
Technical field
The utility model relates to a kind of three phase network disturbing generating device detected for grid adaptability.
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 of deviation and the content such as flickering, unbalanced source voltage generally included line voltage, frequency, 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 and generally needs the three phase network disturbing generating device of configure dedicated to carry out.Possesses the three phase network disturbing generating device of harmonic wave ability, its output voltage can be divided into first-harmonic part and harmonic frequency, harmonic comprises several times harmonic wave, and humorous wave frequency is the integral multiple (this integer is the number of times of harmonic wave) of first-harmonic.According to concrete needs, harmonic can be divided into some groups according to its number of times further, as the low-order harmonic of 2 ~ 7 times, and high order harmonic component of 8 ~ 25 times etc.
As shown in Figure 1, Chinese utility model CN102148501A discloses a kind of disturbance generation device for wind power station, and this device possesses harmonic wave ability, is made up of low-frequency voltage disturbing generating device and high frequency voltage disturbing generating device.Wherein, low-frequency voltage disturbing generating device comprises step-down transformer, filter, current changer module in parallel and step-up transformer etc., and high frequency voltage disturbing generating device comprises rectifier transformer, PWM rectifier module, cascaded H-bridges module and filter composition.Low-frequency voltage disturbing generating device is for generation of fundamental voltage disturbance, and high frequency voltage disturbing generating device is for generation of 2 ~ 25 subharmonic voltage disturbances.
There is following defect in above-mentioned existing disturbance generation device for wind power station: although this device adopts circuit breaker to connect low-frequency voltage disturbing generating device and high frequency voltage disturbing generating device two independently device, can reduce the interference between device, but, because this device adopts the independent generating means of two covers, cause system configuration complicated, parts are many, such as low-frequency voltage disturbing generating device and high frequency voltage disturbing generating device all comprise respective input transformer, the input of high frequency voltage disturbing generating device additionally uses 3 single-phase multi winding transformers, low-frequency voltage disturbing generating device also comprises output transformer, low-frequency voltage disturbing generating device and high frequency voltage disturbing generating device all comprise respective filter etc., cause device overall volume huge, weight is large, particularly be difficult to the requirement of applicable vehicle-carried mobile formula Site Detection application scenario, manufacturing cost is high simultaneously.
Utility model content
The technical problems to be solved in the utility model is, provides a kind of three phase network disturbing generating device, overcome existing three phase network disturbing generating device bulky, be difficult to applicable vehicle-carried mobile formula Site Detection application scenario and require and the high defect of manufacturing cost.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of three phase network disturbing generating device, it is characterized in that, comprise the three-phase multi winding transformer, power model array and the output filter that connect successively, three-phase multi winding transformer input connects three phase network, the output connecting test bus of output filter;
Described power model array comprises three groups of power models that a corresponding phase respectively exports, and often group power model comprises and is no less than 2 power models, and each described power model comprises the Three-Phase PWM Rectifier, DC bus link and the single-phase H bridge inverter that connect successively; The input of described Three-Phase PWM Rectifier connects secondary three-phase windings corresponding to described three-phase multi winding transformer, described DC bus link comprises the DC capacitor group be connected between its two poles of the earth, the output cascade of described single-phase H bridge inverter, forms the basic output of three phase network disturbing generating device; Described often to organize at least one power model in power model be the low-frequency excitation generation power model that output voltage comprises fundamental voltage composition or first-harmonic and adds harmonic voltage composition, the high frequency components generation power model of at least one power model to be output voltage be harmonic voltage composition.
In three phase network disturbing generating device of the present utility model, comprise controller, this controller and each described power model communicate to connect.
In three phase network disturbing generating device of the present utility model, the former limit three-phase windings of described three-phase multi winding transformer is star connection or delta connection, each three-phase windings of secondary is star connection or delta connection.
In three phase network disturbing generating device of the present utility model, described output filter comprises the capacitor adopting star connection or delta connection to connect.
In three phase network disturbing generating device of the present utility model, described output filter comprises reactor, and this reactor is arranged on the three-phase line that described power model array is connected with described capacitor.
In three phase network disturbing generating device of the present utility model, described power model comprises DC chopper circuit, and this DC chopper circuit is connected between the two poles of the earth of described DC bus link.
In three phase network disturbing generating device of the present utility model, comprise three-phase output transformer, its former and deputy limit three-phase windings is star connection or delta connection; After this three-phase output transformer is connected to described power model array, before described output filter or after described output filter.
Implement three phase network disturbing generating device of the present utility model, compared with the prior art, its beneficial effect is:
1. adopt three-phase multi winding transformer, power model array and output filter structure, the direct cascade of output of the low-frequency excitation generation power model wherein in power model array and high frequency components generation power model, and input shares three-phase multi winding transformer, export and share output filter, system configuration is succinct, significantly can reduce overall complexity and the number of devices of the three phase network disturbing generating device comprising harmonic voltage fan-out capability, thus reduction overall volume, weight and manufacturing cost, portable structure can be adopted, meet wind energy turbine set on-the-spot test to high pressure, the requirement of high-capacity three-phase grid disturbance generating means,
2. in device, the outlet side H bridge inverter of each power model can adopt the pulse modulation technology of phase-shifting carrier wave, can improve the equivalent switching frequency of output, promotes response speed, and reduces the volume and weight of output filter;
3. device medium and low frequency disturbance generation power model and the cascade of high frequency components generation power model outlet side, the electric current flow through is identical, but compared with low-frequency excitation generation power model, the switching frequency of high frequency components generation power model needs higher, to ensure the output accuracy of higher harmonic voltage composition, by reducing the input voltage of high frequency components generation power model, DC bus-bar voltage and output voltage are offset to be increased because switching frequency improves the switching loss brought, thus balance the switching loss of each power model, thus reduce the design of system, manufacture difficulty and holistic cost,
4. the power model in device, in the DC bus link that its Three-Phase PWM Rectifier is connected with single-phase H bridge inverter, can DC chopper circuit be set, the extreme dynamic process that reply equipment under test occurs in grid adaptability test process, the stability of lifting device, reduces the impact on on-the-spot electrical network;
5. device middle controller is connected by optical-fibre communications with each power model, the anti-interference of elevator system and operational reliability.
Accompanying drawing explanation
Fig. 1 is the existing structure chart possessing the three phase network disturbing generating device of harmonic voltage fan-out capability.
Fig. 2 is the System's composition figure of the utility model three phase network disturbing generating device.
Fig. 3 is the connection layout of A group power model output cascade and three-phase multi winding transformer in the utility model three phase network disturbing generating device embodiment one.
Fig. 4 is the System's composition figure of the utility model three phase network disturbing generating device embodiment one.
Fig. 5 is the System's composition figure of the utility model three phase network disturbing generating device embodiment two.
Fig. 6 is the System's composition figure of the utility model three phase network disturbing generating device embodiment three.
Fig. 7 is one of circuit structure that in the utility model three phase network disturbing generating device, power model is corresponding.
Fig. 8 is the circuit structure two that in the utility model three phase network disturbing generating device, power model is corresponding.
Fig. 9 is the circuit structure three that in the utility model three phase network disturbing generating device, power model is corresponding.
Figure 10 ~ Figure 13 is the common configuration mode of three-phase multi winding transformer in the utility model three phase network disturbing generating device.
Figure 14 is the communication connected mode of the utility model three phase network disturbing generating device middle controller and power model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 2 and Figure 3, three phase network disturbing generating device of the present utility model comprises three-phase multi winding transformer 10, power model array 20 and output filter 30.
The former limit of three-phase multi winding transformer 10 is connected to three-phase mesohigh electrical network, and secondary for overlap three-phase windings more.Power model array 20 comprises 3 groups of power models, often organizes a certain phase that power model correspondence exports, and often group power model comprises and is no less than 2 power models.As shown in Figure 7, each power model comprises Three-Phase PWM Rectifier 21, DC bus link 22 and single-phase H bridge inverter 23, the input of Three-Phase PWM Rectifier 21 connects the secondary three-phase windings of above-mentioned three-phase multi winding transformer 10 correspondence, DC bus link 22 comprises the DC capacitor group be connected between its two poles of the earth, the output cascade of single-phase H bridge inverter 23, forms the basic output of three phase network disturbing generating device.Often organize the output voltage of at least 1 power model in power model and comprise fundamental voltage composition or first-harmonic adds harmonic voltage composition, this power model is called low-frequency excitation generation power model; Often organize the harmonic wave of output voltage voltage component of at least 1 power model in power model, this power model is called high frequency components generation power model.In practical operation, high frequency components generation power model can export based on harmonic voltage, comprise the voltage component of a small amount of first-harmonic, also can realize the object of the invention.
As shown in figure 14, three phase network disturbing generating device comprises controller, and each power model of this controller and three phase network disturbing generating device communicates to connect, and unifies, cooperation control to power model, can the anti-interference of elevator system and operational reliability.This communication connection realizes by optical fiber or alternate manner.
As shown in Figure 10 to Figure 13, the former limit three-phase windings of three-phase multi winding transformer 10 can adopt star connection or delta connection, each three-phase windings of secondary can adopt star connection or delta connection.
As shown in Figure 8, in order to tackle the extreme dynamic process that equipment under test occurs in grid adaptability test process, the stability of lift three-phase grid disturbance generating means, reduce the impact on on-the-spot electrical network, power model can arrange DC chopper circuit 24.This DC chopper circuit 24 is connected between the two poles of the earth of DC bus link 22, before or after the capacitance group that can be connected to DC bus link 22.
In the present embodiment, DC chopper circuit 24 adopts power semiconductor switch (as IGBT etc.) and current-limiting resistance to form, and in other embodiments, can adopt the DC chopper circuit of other structure.
Three phase network disturbing generating device embodiment one
As shown in Figure 4, three phase network disturbing generating device of the present utility model comprises three-phase multi winding transformer, power model array and output filter.Wherein, the former limit of three-phase multi winding transformer is connected to three-phase mesohigh electrical network, and former limit winding is star connection, and secondary comprises 3n and overlaps three-phase windings, and vice-side winding is delta connection.Power model array comprises 3 groups of power models, often organizes a certain phase that power model correspondence exports, and often organizes power model and comprises n power model.
As shown in Figure 7, the circuit structure of power model comprises the Three-Phase PWM Rectifier 21, DC bus link 22 and the single-phase H bridge inverter 23 that possess two level circuit features.DC bus link 22, between Three-Phase PWM Rectifier 21 and single-phase H bridge inverter 23, comprises the DC capacitor group be connected between its two poles of the earth.Three-Phase PWM Rectifier 21 comprises 3 brachium pontis, and single-phase H bridge inverter 23 comprises two brachium pontis, two level circuits that above-mentioned brachium pontis all adopts two power semiconductor switches of connecting (as IGBT etc.) to form.The input of Three-Phase PWM Rectifier 21 connects the secondary three-phase windings of above-mentioned three-phase multi winding transformer 10 correspondence, the output cascade of single-phase H bridge inverter 23, forms the basic output of three phase network disturbing generating device.
For A group power model, its output cascade and with the annexation of three-phase multi winding transformer as shown in Figure 3.Can find out, the output of n H bridge inverter of same phase carries out head and the tail cascade, and namely the tail end of the 1st H bridge inverter connects the head end of the 2nd H bridge inverter, the like, remaining head end A and tail end X after A corresponding power model serial connection.Similarly, remaining head end B and tail end Y after B corresponding power model serial connection; Remaining head end C and tail end Z after C corresponding power model serial connection.Three-phase exports can adopt star connection, and now tail end X, Y and Z is shorted together and forms mid point N.Output filter connects above-mentioned head end A, B, C, output filter can be made up of reactor 31 and capacitor 32, wherein, capacitor 32 adopts delta connection (also can adopt star connection), and this reactor 31 is arranged on the three-phase line that power model array 20 is connected with capacitor 32.
Suppose that the input and output rated voltage of this three phase network disturbing generating device is 10kV, output capacity is 5MVA, then the power module cascade connection number N of above-mentioned every phase can be 11.9 low-frequency excitation generation power models wherein can be set, the three-phase input voltage of power model can be designed to 690V, and its single-phase output voltage comprises fundamental voltage composition and low-order harmonic voltage, can be designed to 642V, like this, the first-harmonic line voltage after system cascade can reach 10kV.2 high frequency components generation power models separately can be set, the three-phase input voltage of power model can be designed to 345V, and its single-phase output voltage comprises higher harmonic voltage, can be designed to 321V, humorous swash voltage after such system cascade can reach 1.1kV, meets the test request of mains by harmonics.The voltage of the correspondence pair side winding of three-phase multi winding transformer also needs to match with it.When power model adopts above-mentioned two level circuit, low-frequency excitation generation power model can adopt the IGBT power semiconductor switch of 1700V, and high frequency components generation power model then can adopt the IGBT power semiconductor switch of 1200V.Two kinds of power models also all can adopt the input voltage of 690V and the output voltage of 642V when realizing, and all adopt the IGBT device of 1700V, but the design of above-mentioned differentiation can optimization system cost.
According to the requirement of output voltage frequency scope, above-mentioned low-frequency excitation generation power model can adopt lower switching frequency, as 1kHz; High frequency components generation power model then needs to adopt higher switching frequency, as 9kHz.For high frequency components generation power model, the rising of switching frequency can bring the increase of switching loss and cooling requirements.And the above-mentioned input voltage of reduction high frequency components generation power model and the measure of output voltage can be offset switching frequency to a certain extent and raised the switching loss brought and increase, thus balance the switching loss of each power model, reduce the design of system, manufacture difficulty and holistic cost.Two kinds of power models also can all adopt higher switching frequency as 9kHz when realizing, but the design of above-mentioned differentiation can optimization system cost.
Single-phase H bridge inverter can reach 9kHz after 9 grades of cascades, thus promotes response speed, and reduces the volume and weight of output filter.Accordingly, the cut-off frequency of output filter can be arranged on 3kHz to 5kHz.
This three phase network disturbing generating device comprises controller, and controller is connected by optical fiber communication with each power model, unifies, cooperation control to power model, can the anti-interference of elevator system and operational reliability.
Three phase network disturbing generating device embodiment two
As shown in Figure 5, three phase network disturbing generating device of the present utility model comprises three-phase multi winding transformer, power model array and output filter.Wherein, the former limit of three-phase multi winding transformer is connected to three-phase mesohigh electrical network, and former limit winding is delta-connection, and secondary comprises 3n and overlaps three-phase windings, and vice-side winding is star connection.Power model array comprises 3 groups of power models, often organizes a certain phase that power model correspondence exports, and often organizes power model and comprises n power model.As shown in Figure 8, the circuit structure of power model comprises the Three-Phase PWM Rectifier, DC bus link, DC chopper circuit and the single-phase H bridge inverter that possess two level circuit features.DC bus link, between Three-Phase PWM Rectifier and single-phase H bridge inverter, comprises and is connected to DC capacitor group between its two poles of the earth; DC chopper circuit is articulated between the positive and negative bus of DC bus link, to tackle the extreme dynamic process in test process, the stability of lifting device, reduces the impact on on-the-spot electrical network.Three-Phase PWM Rectifier comprises 3 brachium pontis, single-phase H bridge inverter comprises two brachium pontis, DC chopper circuit comprises half brachium pontis and energy consumption resistance, two level circuits that above-mentioned brachium pontis all adopts two power semiconductor switches of connecting (as IGBT) to form.The input of Three-Phase PWM Rectifier connects secondary three-phase windings corresponding to above-mentioned three-phase multi winding transformer, the output cascade of single-phase H bridge inverter, forms the basic output of three phase network disturbing generating device.The output of n H bridge inverter of same phase carries out head and the tail cascade, and namely the tail end of the 1st H bridge inverter connects the head end of the 2nd H bridge inverter, the like, remaining head end A and tail end X after A corresponding power model serial connection.Similarly, remaining head end B and tail end Y after B corresponding power model serial connection; Remaining head end C and tail end Z after C corresponding power model serial connection.Three-phase exports can adopt delta connection, and now tail end X connects head end B, and tail end Y connects head end C, and tail end Z connects head end A, forms closed triangle.Output filter connects above-mentioned head end A, B, C, is made up of reactor, capacitor and resistance, and wherein, capacitor is in series with a resistor, and in wye connection, reactor is arranged on the three-phase line that power model array is connected with capacitor.
Suppose that the input and output rated voltage of this three phase network disturbing generating device is 10kV, output capacity is 7.5MVA, then the power module cascade connection number N of above-mentioned every phase can be 18.Wherein, can arrange 15 low-frequency excitation generation power models, the three-phase input voltage of power model can be designed to 690V, and its single-phase output voltage comprises fundamental voltage composition and low-order harmonic voltage, can be designed to 667V, the first-harmonic line voltage after such system cascade can reach 10kV.3 high frequency components generation power models separately can be set, the three-phase input voltage of power model can be designed to 345V, and its single-phase output voltage comprises higher harmonic voltage, can be designed to 334V, humorous swash voltage after such system cascade can reach 1.0kV, meets the test request of mains by harmonics.The voltage of the correspondence pair side winding of three-phase multi winding transformer also needs to match with it.When power model adopts above-mentioned two level circuit, low-frequency excitation generation power model can adopt the IGBT power semiconductor switch of 1700V, and high frequency components generation power model then can adopt the IGBT power semiconductor switch of 1200V.Two kinds of power models also all can adopt the input voltage of 690V and the output voltage of 667V when realizing, and all adopt the IGBT device of 1700V, but the design of above-mentioned differentiation can optimization system cost.
According to the requirement of output voltage frequency scope, above-mentioned low-frequency excitation generation power model can adopt lower switching frequency, as 1kHz; High frequency components generation power model then needs to adopt higher switching frequency, as 10kHz.For high frequency components generation power model, the rising of switching frequency can bring the increase of switching loss and cooling requirements.And the above-mentioned input voltage of reduction high frequency components generation power model and the measure of output voltage can be offset switching frequency to a certain extent and raised the switching loss brought and increase, thus balance the switching loss of each power model, reduce the design of system, manufacture difficulty and holistic cost.Two kinds of power models also can all adopt higher switching frequency as 10kHz when realizing, but the design of above-mentioned differentiation can optimization system cost.
Single-phase H bridge inverter can reach 15kHz after 15 grades of cascades, thus promotes response speed, and reduces the volume and weight of output filter.Accordingly, the cut-off frequency of output filter can be arranged on 4kHz to 6kHz.
This three phase network disturbing generating device comprises controller, and controller is connected by optical fiber communication with each power model, unifies, cooperation control to power model, can the anti-interference of elevator system and operational reliability.
Three phase network disturbing generating device embodiment three
As shown in Figure 6, three phase network disturbing generating device of the present utility model comprises three-phase multi winding transformer, power model array, three-phase output transformer and output filter.Wherein, the former limit of three-phase multi winding transformer is connected to three-phase mesohigh electrical network, and former limit winding is star connection, and secondary comprises 3n and overlaps three-phase windings, and vice-side winding is delta connection.Power model array comprises 3 groups of power models, often organizes a certain phase that power model correspondence exports, and often organizes power model and comprises n power model.As shown in Figure 9, the circuit structure of power model comprises the Three-Phase PWM Rectifier, DC bus link and the single-phase H bridge inverter that possess tri-level circuit feature; DC bus link, between Three-Phase PWM Rectifier and single-phase H bridge inverter, comprises the two cover DC capacitor groups be connected between its positive and negative electrode and mid point.Three-Phase PWM Rectifier comprises 3 brachium pontis, and single-phase H bridge inverter comprises two brachium pontis, the tri-level circuit that above-mentioned brachium pontis all adopts 4 power semiconductor switches of connecting (as IGBT) and two mid point catching diodes to form.The input of Three-Phase PWM Rectifier connects secondary three-phase windings corresponding to above-mentioned three-phase multi winding transformer, the output cascade of single-phase H bridge inverter, forms the basic output of three phase network disturbing generating device.The output of n H bridge inverter of same phase carries out head and the tail cascade, and namely the tail end of the 1st H bridge inverter connects the head end of the 2nd H bridge inverter, the like, remaining head end A and tail end X after A corresponding power model serial connection.Similarly, remaining head end B and tail end Y after B corresponding power model serial connection; Remaining head end C and tail end Z after C corresponding power model serial connection.Three-phase exports can adopt star connection, and now tail end X, Y and Z is shorted together and forms mid point N.The former limit of three-phase output transformer connects above-mentioned head end A, B, C, former limit winding connection triangular in shape; The final output of secondary forming apparatus, vice-side winding is star connection.Output filter connects the secondary of three-phase output transformer, and be made up of the leakage reactance of three-phase output transformer and capacitor, wherein capacitor is star connection.
In other embodiments, after this three-phase output transformer is connected to output filter.
In other embodiments, output filter can adopt reactor to add the structure of capacitor.
Suppose that the input and output rated voltage of this three phase network disturbing generating device is 35kV, output capacity is 7.5MVA, then the former sideline voltage of above-mentioned three-phase multi winding transformer can be designed to 35kV, and the former and deputy sideline voltage of three-phase output transformer can be designed to 10kV, 35kV respectively.The power module cascade connection number N of so every phase can be 6.Wherein can arrange 5 low-frequency excitation generation power models, the three-phase input voltage of power model can be designed to 1250V, and its single-phase output voltage comprises fundamental voltage composition, can be designed to 1155V, and the first-harmonic line voltage after such power module cascade connection can reach 10kV.Separately can arrange 1 high frequency components generation power model, the three-phase input voltage of power model can be designed to 625V, and its single-phase output voltage comprises harmonic voltage, can be designed to 578V, and the humorous swash voltage after such module-cascade cascade can reach 1.0kV.After the boosting of three-phase output transformer, the harmonious swash voltage of first-harmonic can reach 35kV and 3.5kV respectively, can meet the test request of mains by harmonics.Notice that the voltage of the correspondence pair side winding of the three-phase multi winding transformer of input side also needs to match with it.When power model adopts above-mentioned tri-level circuit, low-frequency excitation generation power model can adopt IGBT power semiconductor switch and the power diode device of 1700V, and high frequency components generation power model then can adopt IGBT power semiconductor switch and the power diode device of 1200V.Two kinds of power models also all can adopt the input voltage of 1250V and the output voltage of 1155V when realizing, and all adopt IGBT device and the diode of 1700V, but the design of above-mentioned differentiation can optimization system cost.
According to the requirement of output voltage frequency scope, above-mentioned low-frequency excitation generation power model can adopt lower switching frequency, as 1kHz; High frequency components generation power model then needs to adopt higher switching frequency, as 8kHz.For high frequency components generation power model, the rising of switching frequency can bring the increase of switching loss and cooling requirements.And the above-mentioned input voltage of reduction high frequency components generation power model and the measure of output voltage can be offset switching frequency to a certain extent and raised the switching loss brought and increase, thus balance the switching loss of each power model, reduce the design of system, manufacture difficulty and holistic cost.Two kinds of power models also can all adopt higher switching frequency as 8kHz when realizing, but the design of above-mentioned differentiation can optimization system cost.
Above-mentioned power model, particularly low-frequency excitation generation power model, its outlet side H bridge inverter, the pulse modulation technology of phase-shifting carrier wave can be adopted, to improve the equivalent switching frequency of system output voltage, can 5kHz be reached after 5 grades of cascades, thus promote response speed, and reduce the volume and weight of output filter.Accordingly, the cut-off frequency of output filter can be arranged on 2.5kHz to 3kHz.
This three phase network disturbing generating device comprises controller, and controller is connected by optical fiber communication with each power model, unifies, cooperation control to power model, can the anti-interference of elevator system and operational reliability.
The control method of three phase network disturbing generating device of the present utility model is implemented to control to above-mentioned three phase network disturbing generating device, this control method comprises, and the switching frequency controlling high frequency components generation power model is not less than the switching frequency of low-frequency excitation generation power model.
Under normal circumstances, the switching frequency controlling high frequency components generation power model is greater than the switching frequency of institute's low-frequency excitation generation power model.
In above-mentioned power model, the output voltage amplitude controlling high frequency components generation power model is less than the output voltage amplitude of low-frequency excitation generation power model, and the input voltage amplitude controlling high frequency components generation power model is less than the input voltage amplitude of low-frequency excitation generation power model.
Above-mentioned power model, particularly low-frequency excitation generation power model, its single-phase H bridge inverter can adopt the pulse modulation technology of phase-shifting carrier wave, to improve the equivalent switching frequency of system output voltage.
By the original edge voltage of three-phase multi winding transformer in adjustment the present embodiment and the secondary voltage of three-phase output transformer, also can other output voltage class requirement adaptive.
Claims (7)
1. a three phase network disturbing generating device, it is characterized in that, comprise the three-phase multi winding transformer, power model array and the output filter that connect successively, three-phase multi winding transformer input connects three phase network, the output connecting test bus of output filter;
Described power model array comprises three groups of power models that a corresponding phase respectively exports, and often group power model comprises and is no less than 2 power models, and each described power model comprises the Three-Phase PWM Rectifier, DC bus link and the single-phase H bridge inverter that connect successively; The input of described Three-Phase PWM Rectifier connects secondary three-phase windings corresponding to described three-phase multi winding transformer, described DC bus link comprises the DC capacitor group be connected between its two poles of the earth, the output cascade of described single-phase H bridge inverter, forms the basic output of three phase network disturbing generating device; Described often to organize at least one power model in power model be the low-frequency excitation generation power model that output voltage comprises fundamental voltage composition or first-harmonic and adds harmonic voltage composition, the high frequency components generation power model of at least one power model to be output voltage be harmonic voltage composition.
2. three phase network disturbing generating device as claimed in claim 1, it is characterized in that, comprise controller, this controller and each described power model communicate to connect.
3. three phase network disturbing generating device as claimed in claim 2, is characterized in that, the former limit three-phase windings of described three-phase multi winding transformer is star connection or delta connection, each three-phase windings of secondary is star connection or delta connection.
4. three phase network disturbing generating device as claimed in claim 2, is characterized in that, described output filter comprises the capacitor adopting star connection or delta connection to connect.
5. three phase network disturbing generating device as claimed in claim 4, it is characterized in that, described output filter comprises reactor, and this reactor is arranged on the three-phase line that described power model array is connected with described capacitor.
6. the three phase network disturbing generating device as described in one of claim 1 to 5, is characterized in that, described power model comprises DC chopper circuit, and this DC chopper circuit is connected between the two poles of the earth of described DC bus link.
7. the three phase network disturbing generating device as described in one of claim 1 to 5, is characterized in that, comprises three-phase output transformer, and its former and deputy limit three-phase windings is star connection or delta connection; After this three-phase output transformer is connected to described power model array, before described output filter or after described output filter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953582A (en) * | 2015-06-25 | 2015-09-30 | 深圳市禾望电气股份有限公司 | Three-phase power grid disturbance generating device and control method thereof |
| CN107947598A (en) * | 2017-11-23 | 2018-04-20 | 中国电力科学研究院 | A kind of high-frequency isolation grid disturbance device |
| CN108512243A (en) * | 2018-05-07 | 2018-09-07 | 北京金风科创风电设备有限公司 | Power transmission system, wind generating set and wind power plant |
| CN110471004A (en) * | 2019-08-05 | 2019-11-19 | 深圳市禾望电气股份有限公司 | Current transformer and its operation and monitoring method |
| CN114221347A (en) * | 2022-02-14 | 2022-03-22 | 国网江苏省电力有限公司苏州供电分公司 | Method and system for improving response speed of dynamic lightning protection system |
-
2015
- 2015-06-25 CN CN201520442435.1U patent/CN204720981U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953582A (en) * | 2015-06-25 | 2015-09-30 | 深圳市禾望电气股份有限公司 | Three-phase power grid disturbance generating device and control method thereof |
| CN104953582B (en) * | 2015-06-25 | 2018-01-16 | 深圳市禾望电气股份有限公司 | A kind of three phase network disturbing generating device and its control method |
| CN107947598A (en) * | 2017-11-23 | 2018-04-20 | 中国电力科学研究院 | A kind of high-frequency isolation grid disturbance device |
| CN108512243A (en) * | 2018-05-07 | 2018-09-07 | 北京金风科创风电设备有限公司 | Power transmission system, wind generating set and wind power plant |
| CN110471004A (en) * | 2019-08-05 | 2019-11-19 | 深圳市禾望电气股份有限公司 | Current transformer and its operation and monitoring method |
| CN114221347A (en) * | 2022-02-14 | 2022-03-22 | 国网江苏省电力有限公司苏州供电分公司 | Method and system for improving response speed of dynamic lightning protection system |
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