CN103630763A - Alternating-current power supply three-phase unbalanced drop simulator and simulation method - Google Patents
Alternating-current power supply three-phase unbalanced drop simulator and simulation method Download PDFInfo
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- CN103630763A CN103630763A CN201310547228.8A CN201310547228A CN103630763A CN 103630763 A CN103630763 A CN 103630763A CN 201310547228 A CN201310547228 A CN 201310547228A CN 103630763 A CN103630763 A CN 103630763A
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Abstract
The invention discloses an alternating-current power supply three-phase unbalanced drop simulator, which comprises a voltage source type four-quadrant high-voltage converter, the three-phase output ends of the voltage source type four-quadrant high-voltage converter are respectively connected with the corresponding terminals of the input side of a three-phase separate winding transformer, the three-phase separate winding transformer is a single-phase output transformer, moreover, the output side of the three-phase separate winding transformer is Y type output, and the neutral point of the output side is not grounded. By controlling the voltage source type four-quadrant high-voltage converter, the alternating-current power supply three-phase unbalanced drop simulator respectively sends control signals to the three-phase power units of the voltage source type four-quadrant high-voltage converter according to three-phase unbalanced drop requirement, a voltage drop value which meets the set requirement is generated by the three-phase separate winding transformer, and the alternating-current power supply three-phase unbalanced drop simulator can simulate the faults of 10kV and above power grids, and can prevent the phenomenon of transformer voltage coupling in three-phase unbalanced drop simulation, thus increasing the accuracy of output voltage.
Description
Technical field
The present invention relates to a kind of power supply analogue means and analogy method, relate in particular to a kind of AC power three-phase imbalance sag simulation device and analogy method.
Background technology
Along with new energy grid-connected power system access electrical networks such as China's photovoltaic plant and wind energy turbine set, for ensureing the stable operation of new energy grid-connected power security of system, country has put into effect the new energy grid-connected power system low-voltage ride-through capability technical standard of access electric system.In standard, stipulate, when dissimilar fault occurs in electric system, as three phase short circuit fault, two-phase short-circuit fault, single-phase grounding fault etc., new energy grid-connected power system should have low voltage ride-through capability.For this performance test, need the AC power can analog voltage fallen, and how to realize that imbalance falls, be the difficult point of this test.
Using frequency converter simulating grid to fall, is current comparatively general a kind of method of testing.Traditional three-phase imbalance of realizing falls method and has following two kinds:
(1) unbalance voltage that frequency converter is directly realized is fallen.
Due to the restriction of output voltage grade, the method can only be applicable to low voltage electric network or the test of laboratory pattern.
(2) adopt transformer outgoing side to connect the method for three-phase voltage increasing transformer T1, its principle of work as shown in Figure 1.
Although the method can realize the electric network fault simulation of 10kV and above, but when realizing imbalance and fall, owing to there being the phenomenon of voltage coupling, will cause the output voltage waveforms of transformer to distort, have and fall a little uncontrollable shortcoming, can not accurately realize imbalance and fall, as when single-phase the falling, output waveform as shown in Figure 2.
Summary of the invention
The object of this invention is to provide a kind of AC power three-phase imbalance sag simulation device and analogy method, can realize the electric network fault simulation of 10kV and above, avoid occurring transformer voltage coupling phenomenon, the accuracy that improves output voltage when simulation three-phase imbalance falls.
The present invention adopts following technical proposals:
A kind of AC power three-phase imbalance sag simulation device, comprise voltage-source type four-quadrant high-vol, the three-phase output end of voltage-source type four-quadrant high-vol connects respectively the corresponding terminals of three-phase separate winding transformer input side, three-phase separate winding transformer is that output single-phase transformer and outgoing side are the output of Y type, outgoing side isolated neutral.
The voltage measurement display instrument that described three-phase separate winding transformer outgoing side connects voltage transformer (VT) and is used in conjunction with voltage transformer (VT).
Described three-phase separate winding transformer outgoing side is connected with 3 voltage transformer (VT), adopts wye connection to measure the three-phase voltage of three-phase separate winding transformer output; The central point of 3 voltage transformer (VT) is connected with the output neutral point of three-phase separate winding transformer, and the central point of voltage transformer (VT) is earth-free.
Described voltage measurement display instrument adopts oscillograph or power analyzer.
Differential seat angle between described voltage-source type four-quadrant high-vol three-phase supply is 120 °.
AC power three-phase imbalance falls an analogy method, comprises the following steps:
A: use voltage-source type four-quadrant high-vol as power supply, and by controlling the voltage phase angle of every phase power supply, making the differential seat angle between voltage-source type four-quadrant high-vol three-phase supply is 120 °;
B: the corresponding terminals that the three-phase output end of voltage-source type four-quadrant high-vol are connected respectively to three-phase separate winding transformer input side, three-phase separate winding transformer is that output single-phase transformer and outgoing side are the output of Y type, outgoing side isolated neutral;
C: fall requirement according to required three-phase imbalance, control respectively the three-phase converter module of voltage-source type four-quadrant high-vol UC to three-phase separate winding transformer T2 output low pressure, after boosting by three-phase separate winding transformer T2, produce to meet and set the voltage requiring and fall value, realize AC power three-phase imbalance and fall simulation.
Also comprise and fall depth detection step D, three-phase separate winding transformer outgoing side connect voltage transformer (VT) and with the voltage measurement display instrument that voltage transformer (VT) is used in conjunction with, utilize voltage measurement display instrument to detect AC power three-phase imbalance and fall the degree of depth of falling that simulation produces.
Described three-phase separate winding transformer outgoing side is connected with 3 voltage transformer (VT), adopts wye connection to measure the three-phase voltage of three-phase separate winding transformer output; The central point of 3 voltage transformer (VT) is connected with the output neutral point of three-phase separate winding transformer, and the central point of voltage transformer (VT) is earth-free.
Described voltage measurement display instrument adopts oscillograph or power analyzer.
The present invention is by controlling voltage-source type four-quadrant high-vol, according to required three-phase imbalance, falling requirement transmits control signal to the three-phase converter module of voltage-source type four-quadrant high-vol respectively, the voltage that meets setting requirement in the generation of three-phase separate winding transformer falls value, can realize the electric network fault simulation of 10kV and above, avoid occurring transformer voltage coupling phenomenon, the accuracy that improves output voltage when simulation three-phase imbalance falls.
Accompanying drawing explanation
Fig. 1 is the principle schematic of existing three-phase imbalance sag simulation device;
Fig. 2 is the oscillogram of existing three-phase imbalance sag simulation device output voltage;
Fig. 3 is the principle schematic of three-phase imbalance sag simulation device of the present invention;
Fig. 4 is the oscillogram of three-phase imbalance sag simulation device output voltage of the present invention.
Embodiment
As described in Figure 3, AC power three-phase imbalance sag simulation device of the present invention comprises voltage-source type four-quadrant high-vol UC, and the differential seat angle between voltage-source type four-quadrant high-vol UC three-phase supply is 120 °; The three-phase output end of voltage-source type four-quadrant high-vol UC connects respectively the corresponding terminals of three-phase separate winding transformer T2 input side, by three-phase separate winding transformer T2 High voltage output.This three-phase separate winding transformer T2 is that input side is that three-phase independent winding and outgoing side are the transformer of Y type output, and outgoing side neutral point N1 is earth-free simultaneously.It is in order to meet tested object phase three-wire three or three-phase four-wire system wiring requirement that outgoing side adopts wye connection.The voltage measurement display instrument that three-phase separate winding transformer T2 outgoing side is connected with voltage transformer pt and is used in conjunction with voltage transformer pt, voltage measurement display instrument can adopt oscillograph or power analyzer.In the present embodiment, three-phase separate winding transformer T2 outgoing side is connected with 3 voltage transformer pts, adopts wye connection to measure the three-phase voltage of three-phase separate winding transformer T2 output; The central point N of 3 voltage transformer pts is connected with the output neutral point N1 of three-phase separate winding transformer T2, and the central point N of voltage transformer pt is earth-free.
AC power three-phase imbalance of the present invention falls analogy method, comprises the following steps:
A: use voltage-source type four-quadrant high-vol UC as power supply, and by controlling the voltage phase angle of every phase power supply, making the differential seat angle between voltage-source type four-quadrant high-vol UC three-phase supply is 120 °;
B: the three-phase output end of voltage-source type four-quadrant high-vol UC is connected respectively to the corresponding terminals of three-phase separate winding transformer T2 input side, by three-phase separate winding transformer T2 High voltage output; Three-phase separate winding transformer T2 input side is that three-phase independent winding and outgoing side are the output of Y type, and outgoing side neutral point N1 is earth-free simultaneously;
C: fall requirement according to required three-phase imbalance, control respectively the three-phase converter module of voltage-source type four-quadrant high-vol UC to three-phase separate winding transformer T2 output low pressure, after boosting by three-phase separate winding transformer T2, produce to meet and set the voltage requiring and fall value, realize AC power three-phase imbalance and fall simulation;
D: the voltage measurement display instrument that connects voltage transformer pt and be used in conjunction with voltage transformer pt at three-phase separate winding transformer T2 outgoing side, voltage measurement display instrument can adopt oscillograph or power analyzer; Utilize voltage measurement display instrument to detect the degree of depth of falling that AC power three-phase imbalance falls simulation generation.Three-phase separate winding transformer T2 outgoing side is connected with 3 voltage transformer pts, adopts wye connection to measure the three-phase voltage of three-phase separate winding transformer T2 output; The central point N of 3 voltage transformer pts is connected with the output neutral point N1 of three-phase separate winding transformer T2, and the central point N of voltage transformer pt is earth-free.
In use, the three-phase supply of voltage-source type four-quadrant high-vol UC is independent current source in the present invention, and by controlling the voltage phase angle of every phase power supply, making the differential seat angle between voltage-source type four-quadrant high-vol UC three-phase supply is 120 °.When no-voltage falls, also can be used as normal power source load and use.
When needs analog AC power supply three-phase imbalance falls, can pass through the control module of voltage-source type four-quadrant high-vol UC, according to required three-phase imbalance, fall requirement and to the three-phase converter module of voltage-source type four-quadrant high-vol UC, transmit control signal respectively, can reach three-phase and export non-interfering object.
Because the present invention adopts three-phase separate winding transformer T2, between coil, there is not electromagnetic interference (EMI), when analog AC power supply three-phase imbalance falls, voltage-source type four-quadrant high-vol UC is according to falling the desired different amplitude of simulation, by inputting three-phase supply at three-phase separate winding transformer T2 input side, the voltage that can meet in the outgoing side generation of three-phase separate winding transformer T2 setting requirement falls value, the voltage waveform of the outgoing side output of three-phase separate winding transformer T2 as described in Figure 4, have fall a little controlled, fall precision high, control method is easy to the advantage realizing.
The wiring measuring method of above-mentioned voltage transformer pt, guarantees that voltage measurement display instrument can obtain the high-precision depth measurement of falling by voltage transformer pt, avoids the phenomenon that measured value and actual value are not inconsistent to occur.
Claims (9)
1. an AC power three-phase imbalance sag simulation device, it is characterized in that: comprise voltage-source type four-quadrant high-vol, the three-phase output end of voltage-source type four-quadrant high-vol connects respectively the corresponding terminals of three-phase separate winding transformer input side, three-phase separate winding transformer is that output single-phase transformer and outgoing side are the output of Y type, outgoing side isolated neutral.
2. AC power three-phase imbalance sag simulation device according to claim 1, is characterized in that: the voltage measurement display instrument that described three-phase separate winding transformer outgoing side connects voltage transformer (VT) and is used in conjunction with voltage transformer (VT).
3. AC power three-phase imbalance sag simulation device according to claim 2, it is characterized in that: described three-phase separate winding transformer outgoing side is connected with 3 voltage transformer (VT), adopt wye connection to measure the three-phase voltage of three-phase separate winding transformer output; The central point of 3 voltage transformer (VT) is connected with the output neutral point of three-phase separate winding transformer, and the central point of voltage transformer (VT) is earth-free.
4. AC power three-phase imbalance sag simulation device according to claim 3, is characterized in that: described voltage measurement display instrument adopts oscillograph or power analyzer.
5. AC power three-phase imbalance sag simulation device according to claim 4, is characterized in that: the differential seat angle between described voltage-source type four-quadrant high-vol three-phase supply is 120 °.
6. AC power three-phase imbalance falls an analogy method, it is characterized in that, comprises the following steps:
A: use voltage-source type four-quadrant high-vol as power supply, and by controlling the voltage phase angle of every phase power supply, making the differential seat angle between voltage-source type four-quadrant high-vol three-phase supply is 120 °;
B: the corresponding terminals that the three-phase output end of voltage-source type four-quadrant high-vol are connected respectively to three-phase separate winding transformer input side, three-phase separate winding transformer is that output single-phase transformer and outgoing side are the output of Y type, outgoing side isolated neutral;
C: fall requirement according to required three-phase imbalance, control respectively the three-phase converter module of voltage-source type four-quadrant high-vol UC to three-phase separate winding transformer T2 output low pressure, after boosting by three-phase separate winding transformer T2, produce to meet and set the voltage requiring and fall value, realize AC power three-phase imbalance and fall simulation.
7. AC power three-phase imbalance according to claim 6 falls analogy method, it is characterized in that: also comprise and fall depth detection step D, three-phase separate winding transformer outgoing side connect voltage transformer (VT) and with the voltage measurement display instrument that voltage transformer (VT) is used in conjunction with, utilize voltage measurement display instrument to detect AC power three-phase imbalance and fall the degree of depth of falling that simulation produces.
8. AC power three-phase imbalance according to claim 7 falls analogy method, it is characterized in that: described three-phase separate winding transformer outgoing side is connected with 3 voltage transformer (VT), adopt wye connection to measure the three-phase voltage of three-phase separate winding transformer output; The central point of 3 voltage transformer (VT) is connected with the output neutral point of three-phase separate winding transformer, and the central point of voltage transformer (VT) is earth-free.
9. AC power three-phase imbalance according to claim 8 falls analogy method, it is characterized in that: described voltage measurement display instrument adopts oscillograph or power analyzer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152619A (en) * | 2017-12-16 | 2018-06-12 | 西安翌飞核能装备股份有限公司 | A kind of electric network fault simulator and its control method |
| CN109962491A (en) * | 2017-12-22 | 2019-07-02 | 北京金风科创风电设备有限公司 | Fault processing method and fault processing device for converter of wind generating set |
| CN113791290A (en) * | 2021-08-17 | 2021-12-14 | 深圳市禾望电气股份有限公司 | Three-phase power grid simulation device with independently controllable output phase voltages and control method thereof |
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| CN202066924U (en) * | 2011-04-11 | 2011-12-07 | 上海电科电器科技有限公司 | Voltage sag simulation device |
| CN102998549A (en) * | 2012-07-10 | 2013-03-27 | 辽宁荣信电气传动技术有限责任公司 | H-bridge based single-phase low voltage ride-through test bed |
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| JP2005049278A (en) * | 2003-07-30 | 2005-02-24 | Yaskawa Electric Corp | Power source phase interruption sensing method of three-phase circuit converter |
| CN201674411U (en) * | 2010-04-26 | 2010-12-15 | 哈尔滨九洲电气股份有限公司 | Deflector with full-bridge three-level control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108152619A (en) * | 2017-12-16 | 2018-06-12 | 西安翌飞核能装备股份有限公司 | A kind of electric network fault simulator and its control method |
| CN109962491A (en) * | 2017-12-22 | 2019-07-02 | 北京金风科创风电设备有限公司 | Fault processing method and fault processing device for converter of wind generating set |
| CN113791290A (en) * | 2021-08-17 | 2021-12-14 | 深圳市禾望电气股份有限公司 | Three-phase power grid simulation device with independently controllable output phase voltages and control method thereof |
| CN113791290B (en) * | 2021-08-17 | 2024-04-02 | 深圳市禾望电气股份有限公司 | Three-phase power grid simulation device capable of independently controlling output voltages of all phases and control method thereof |
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Application publication date: 20140312 |