CN116243096A - Test circuit for high-power conversion device of weak power grid and control method thereof - Google Patents
Test circuit for high-power conversion device of weak power grid and control method thereof Download PDFInfo
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- CN116243096A CN116243096A CN202310522365.XA CN202310522365A CN116243096A CN 116243096 A CN116243096 A CN 116243096A CN 202310522365 A CN202310522365 A CN 202310522365A CN 116243096 A CN116243096 A CN 116243096A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
Abstract
The invention discloses a test circuit for a high-power conversion device of a weak power grid and a control method thereof. The test circuit realizes the load test of the static analog motor of the device to be tested in a non-motor object, and adjusts the output voltage and frequency of the second inverter circuit through the controller, so that the device to be tested is tested under the working conditions of different voltage deviations and different rated frequencies; meanwhile, harmonic pollution of all public power grids in the testing process is controlled, the influence of harmonic current and voltage components on the testing process is greatly reduced, and the testing accuracy is improved.
Description
Technical Field
The invention relates to the technical field of control circuits, in particular to a test circuit for a high-power conversion device of a weak power grid and a control method thereof.
Background
Based on the development of electricity and the rapid popularization of automation equipment, related electric products using semiconductor conversion technology are being widely applied and connected under public electric networks, and the products mainly show the forms of frequency converters, servo drivers, photovoltaic and wind energy inverters, various converters and the like, so that in order to ensure the quality of the produced related products, according to the reliability characteristics of failure bathtub curves and the like of power electronic products, the loading pressure test of the related products before delivery by a manufacturing plant becomes particularly critical. In the process of testing large-power conversion devices produced in batch by the existing test circuit, because the power conversion is the basic principle of chopping control of an electronic switch, the large-power conversion device conducts non-negligible harmonic current (THDi) and voltage (THDu) components to a public power grid, the components can obviously influence the power quality of the power grid and cause reactive power loss, the problem of insufficient test accuracy exists when the large-power conversion device is tested, and the test effect of a device to be tested is influenced. Therefore, the test circuit in the prior art has a problem that the test effect is affected by the generation of harmonic current and voltage components.
Disclosure of Invention
The embodiment of the invention provides a test circuit for a high-power conversion device of a weak power grid and a control method thereof, aiming at solving the problem that the test effect is affected by harmonic current and voltage components in the test circuit in the prior art.
In a first aspect, an embodiment of the present invention discloses a test circuit for a weak power grid high-power conversion device, the test circuit is used for testing a power conversion device to be tested, the device to be tested includes a rectifier and a frequency converter which are connected, and the test circuit is characterized in that the circuit includes a first filter, a second filter, a first inverter circuit, a third filter, an ac contactor, a first isolation transformer, a second inverter circuit and a controller;
the input end of the first filter is connected with a weak power grid, and the output end of the first filter is connected with the input end of the first inverter circuit; the output end of the first inverter circuit is connected with the input end of the second inverter circuit; the output end of the second inverter circuit is connected with the input end of the second filter, and the output end of the second filter is connected with the input end of the rectifier in the device to be tested and the output end of the first isolation transformer;
the output end of the frequency converter in the device to be tested is connected with the input end of the third filter, the output end of the third filter is connected with one end of the alternating current contactor, and the other end of the alternating current contactor is connected with the input end of the first isolation transformer;
the first control end of the first inverter circuit, the second control end of the second inverter circuit and the third control end of the frequency converter in the device to be tested are all electrically connected with the controller.
In a second aspect, an embodiment of the present invention further discloses a control method for a test circuit of a weak grid high-power conversion device, where the control method is applied to the test circuit for a weak grid high-power conversion device according to the first aspect, and the method includes:
the controller acquires first phase information of a first monitoring point; the first monitoring point is a connection point between the output end of the second filter and the output end of the first isolation transformer;
the controller controls the alternating current output by the device to be tested to be identical with the first phase information according to the first phase information;
the controller acquires circuit detection information of the second monitoring point; the circuit detection information comprises current and voltage of a second monitoring point; the second monitoring point is a connection point between the output end of the frequency converter and the input end of the third filter;
and the controller controls the real-time output power of the device to be tested according to the circuit detection information so as to test the working condition of the device to be tested.
The embodiment of the application discloses a test circuit for a high-power conversion device of a weak power grid and a control method thereof. The test circuit realizes the load test of the static analog motor of the device to be tested in a non-motor object, and adjusts the output voltage and frequency of the second inverter circuit through the controller, so that the device to be tested is tested under the working conditions of different voltage deviations and different rated frequencies; meanwhile, harmonic pollution of all public power grids in the testing process is controlled, the influence of harmonic current and voltage components on the testing process is greatly reduced, and the testing accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an electrical schematic diagram of a test circuit for a weak grid high power conversion device according to an embodiment of the present invention;
fig. 2 is a circuit configuration diagram of a bridge inverter circuit according to an embodiment of the present invention;
FIG. 3 is a circuit configuration diagram of a device under test according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another circuit of the device under test according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a circuit of a device under test according to an embodiment of the present invention;
fig. 6 is a method flowchart of a control method according to an embodiment of the present invention.
Reference numerals: TRU1, rectifier; INV1, a frequency converter; LC1, first filter; LC2, a second filter; pti1, a first inverter circuit; LC3, third filter; KM1, an alternating current contactor; t2, a first isolation type transformer; t1, a second isolation type transformer; pto1, a second inverter circuit; g1, weak current network; fuse1, fuse; QF1, switching element; AIM, incoming filter; KM1, AC contactor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
The embodiment of the invention also discloses a test circuit for the high-power conversion device of the weak power grid, which is used for testing the power conversion device to be tested, wherein the device to be tested comprises a rectifier TRU1 and a frequency converter INV1 which are connected, as shown in figure 1, the test circuit comprises a first filter LC1, a second filter LC2, a first inverter circuit Pti1, a third filter LC3, an alternating current contactor KM1, a first isolation transformer T2, a second inverter circuit Pto1 and a controller (not shown in the figure); the input end of the first filter LC1 is connected with a weak power grid G1, and the output end of the first filter LC1 is connected with the input end of the first inverter circuit Pti 1; the output end of the first inverter circuit Pti1 is connected with the input end of the second inverter circuit Pto 1; the output end of the second inverter circuit Pto1 is connected with the input end of the second filter LC2, and the output end of the second filter LC2 is connected with the input end of the rectifier TRU1 and the output end of the first isolation transformer T2 in the device to be tested; the output end of the frequency converter INV1 in the device to be tested is connected with the input end of the third filter LC3, the output end of the third filter LC3 is connected with one end of the alternating current contactor KM1, and the other end of the alternating current contactor KM1 is connected with the input end of the first isolation transformer T2; the first control end of the first inverter circuit Pti1, the second control end of the second inverter circuit Pto1, and the third control end of the inverter INV1 in the device to be tested are all electrically connected with the controller. The controller may be an MCU chip with a circuit control function.
The method is used for configuring the circuit structure to test the device to be tested, so that the influence of power grid harmonic waves is the lowest in the process of testing the device to be tested, and meanwhile, the loading test of active current of the high-power conversion device is realized under the weak power grid G1. The device to be tested consists of a rectifier TRU1 and an inverter INV 1. Regarding the generation of harmonic components, the harmonic is mainly generated by diode rectification in the rectifier TRU1 and PWM chopping of the IGBT element and conducted to the circuit, and in order to block the conduction of a large amount of these harmonic components to the weak power grid G1, a first filter LC1, a first inverter circuit Pti1, a second inverter circuit Pto1 and a second filter LC2 are provided in front of the test voltage supply end of the device to be tested; the first filter LC1 is combined with the first inverter circuit Pti1 to realize the active and controllable rectification of alternating current into direct current; the second inverter circuit Pto1 and the second filter LC2 are combined to realize active and controllable inversion of the dc point into ac. The alternating current output by the second filter LC2 is the alternating current with adjustable frequency, at this time, the harmonic wave of the device to be tested is effectively inhibited and blocked in the direct current link between the first inverter circuit Pti1 and the second inverter circuit Pto1, and meanwhile, the first filter LC1 and the second filter LC2 can play an auxiliary partition role. The controller may send control signals to the first inverter circuit Pti1 and the second inverter circuit Pto1, so as to adjust the frequency, current, voltage and phase of the alternating current outputted from the second filter LC 2. The controller can also send control signals to the inverter INV1 of the device to be tested, so that the frequency, current, voltage and phase of the alternating current output by the inverter INV1 are adjusted.
The device to be tested is tested, the high-power loading capacity under the weak power grid G1 is required to be realized, and the principle of realizing the high-power loading capacity under the weak power grid G1 is as follows. The point a in the test circuit provides the power required for starting and heating loss of the test circuit, the part of the power accounts for about 10% of the total test power (Ptn) (hereinafter, the part of power is indicated as Ptab), the point B in the test circuit is the power supply point on the power grid side, and the power conversion device can be a VFD device (rectifier TRU1 in fig. 3 is a diode rectifier TRU1 in the left dashed frame part), a VFD device in fig. 4 or a VFD device in fig. 5, and the power supply is performed on the device to be tested through the point B in the test process. The inverter INV1 in the device to be tested outputs alternating voltage Uc with the same phase as the real-time voltage (Ub) at the point B through a specific control strategy, after the Uc filters the PWM alternating current into alternating current with higher sine degree through a third filter LC3, the alternating current is boosted into Ue through a first isolation transformer T2, at this time, the real-time voltage value Ue > Ub is provided with a detection sensor for measuring current and voltage in a CD section line, the detection sensor acquires a circuit detection signal containing the current and voltage and transmits the circuit detection signal to a controller, and the controller controls and adjusts the real-time output power (current and voltage) of the inverter INV1 according to the circuit detection signal. At this time, the test total power Ptn is circulated through the rectifier TRU1 and the inverter INV1 via points C, D, E and B, and the power reaching point E is about 90% of the test total power Ptn due to the switching loss of the power semiconductor of the device to be tested and the electromagnetic heating loss of each line on the test circuit, so that the test total power ptn=ptab (10% Ptn) +ptce (90% Ptn) between points B and C. The rectifier TRU1 is a diode rectifier TRU1 (the structure is shown in fig. 3) composed of 6 diodes or an IGBT active rectifier TRU1 composed of 6 thyristors. Between the points C and D, detection sensors for measuring current and voltage may be provided, and the detection sensors may be hall-type current detection sensors MS1, and the specific setting positions are shown in fig. 1.
An alternating current contactor KM1 is further arranged between the first isolation transformer T2 and the third filter LC3, and in order to ensure that electric energy flows from B to C when the point B is electrified, the alternating current contactor KM1 can be closed after the direct current capacitor in the device to be tested is charged after the device to be tested is started.
Through the implementation process, the power test of the high-power (Ptn) power conversion device is completed by using small public power grid energy Ptab, the active power Ptpn of the power component of the Ptn occupies more than 95%, the reactive power PtSn is about 5% when the rectifier TRU1 is the diode rectifier TRU1, and when the rectifier TRU1 is the IGBT active rectifier TRU1 (AFE), ptpn is about > =99.5%, ptSn < = 0.5%, and the active component is close to or equal to the working power of the working condition of the device to be tested in practical application, so that the load heating test of the direct-current power capacitor in the device to be tested is fully completed.
In a more specific embodiment, the test circuit further comprises a second isolation transformer T1; the second isolation transformer T1 is disposed in series between the weak grid G1 and the input end of the first filter LC 1. The second isolation type transformer T1 can be arranged between the power grid and the first filter LC1, the second isolation type transformer T1 is an unnecessary component, and the second isolation type transformer T1 can be used for assisting in isolating harmonic waves generated by the device to be tested in the testing process, so that the suppression effect of the whole circuit on harmonic current and voltage components is further improved.
In a more specific embodiment, each of the first inverter circuit Pti1 and the second inverter circuit Pto1 is a bridge inverter circuit composed of 6 IGBT elements, and a gate electrode of each of the IGBT elements is connected to the controller as a control terminal. The first inverter circuit Pti1 and the second inverter circuit Pto1 are both bridge inverter circuits composed of 6 IGBT elements, and two IGBT elements are combined to form an inverter branch corresponding to a phase voltage, so that three inverter branches corresponding to three phase voltages can be obtained correspondingly after combination, the specific circuit structures of the first inverter circuit Pti1 and the second inverter circuit Pto1 are shown in fig. 2, the ends P1, P2 and P3 in fig. 2 are all control ends connected with a controller, U, V, W is a three-phase output end in three-phase power, +is an anode input end, and-is a cathode input end.
In a more specific embodiment, the first filter LC1, the second filter LC2 and the third filter LC3 are all LC sine wave filters. In a specific application process, in order to improve the filtering effect of the filter, the first filter LC1, the second filter LC2, and the third filter LC3 may be LC sine wave filters.
In a more specific embodiment, the primary-secondary side transformation ratio of the first isolation transformer T2 is 1: (1.05-1.1). In order to improve the transformation effect of the first isolation transformer T2, thereby further improving the duty ratio of the active power Ptpn in the test power Ptn, the first isolation transformer T2 may be configured as a transformer with a specific primary-secondary transformation ratio, and in a preferred embodiment, the primary-secondary transformation ratio of the first isolation transformer T2 is 1: (1.05-1.1).
In a more specific embodiment, the test circuit further includes a Fuse1, and the Fuse1 is connected in series between an output terminal of the rectifier TRU1 and an input terminal of the inverter INV1 in the device under test. In order to improve the safety of testing the device to be tested, a Fuse1 may be further disposed in series between the output end of the rectifier TRU1 and the input end of the inverter INV 1.
In a more specific embodiment, the test circuit further comprises a switching element QF1, the switching element QF1 being arranged between the second isolation transformer T1 and the input of the first filter LC 1. Wherein, the switch element QF1 is a switch element QF1 with a fuse. The switching element QF1 may be disposed in the test circuit, the switching element QF1 is disposed between the second isolation transformer T1 and the input end of the first filter LC1, for breaking circuit energy, and the switching element QF1 may be a switching element QF1 with a fuse, by which the safety of testing the device to be tested may be further improved.
In a more specific embodiment, the test circuit further comprises an incoming line filter AIM, which is arranged in series to the front end of the input of the rectifier TRU1 in the device to be tested. Specifically, an incoming line filter AIM can be further arranged in the test circuit, and the arrangement position of the incoming line filter AIM is located between the point B and the input end of the rectifier TRU 1; the current input to the device to be tested is filtered by the incoming filter AIM, so that the duty ratio of the active power Ptpn in the test power Ptn is further improved. The specific structure of the wire inlet filter AIM is shown in fig. 5.
The test circuit can realize the load test of the device to be tested (VFD device) on the static simulation motor of the non-motor object. And the harmonic pollution of all public power grids in the testing process is controlled, the influence of harmonic current and voltage components on the testing process is greatly reduced, and the accuracy of the testing result is improved. The output voltage and the frequency of the inverter INV1 in the device to be tested can be adjusted, so that the device to be tested can simulate the working condition test under different voltage deviations and different rated frequencies; based on the main energy internal circulation design and the control strategy, the test loop formed by the C-D-E-B has very high energy conversion efficiency (measured data > =94%), realizes the characteristics of green, high efficiency, economy and the like through a specific circuit structure, and can be widely used in manufacturing test links of all related power electronic conversion devices.
The embodiment of the application also discloses a control method for the test circuit of the high-power conversion device of the weak power grid, which is applied to the test circuit of the high-power conversion device of the weak power grid in the embodiment, as shown in fig. 6, and comprises steps S110-S140.
S110, the controller acquires first phase information of a first monitoring point; the first monitoring point is a connection point between the output end of the second filter and the output end of the first isolation transformer.
The controller also obtains first phase information of a first monitoring point, wherein the first monitoring point is a point B in the test circuit.
And S120, the controller controls the alternating current output by the device to be tested to be identical with the first phase information according to the first phase information.
The controller sends a control instruction to the frequency converter of the device to be tested according to the first phase information, so that the phase of alternating current output by the frequency converter is adjusted, and the alternating current output by the device to be tested is identical to the first phase information.
S130, the controller acquires circuit detection information of the second monitoring point; the circuit detection information comprises current and voltage of a second monitoring point; the second monitoring point is a connection point between the output end of the frequency converter and the input end of the third filter, and the second monitoring point is a connection point between the point C and the point D in the test circuit.
And S140, the controller controls the real-time output power of the device to be tested according to the circuit detection information so as to test the working condition of the device to be tested.
The controller sends a control instruction to the frequency converter of the device to be tested according to the circuit detection information, so that the current and the voltage of alternating current output by the frequency converter are adjusted, the real-time output power of the device to be tested is controlled, namely, the working condition of the device to be tested can be tested, and the corresponding test result can be obtained.
The invention discloses a test circuit for a high-power conversion device of a weak power grid and a control method thereof. The test circuit realizes the load test of the static analog motor of the device to be tested in a non-motor object, and adjusts the output voltage and frequency of the second inverter circuit through the controller, so that the device to be tested is tested under the working conditions of different voltage deviations and different rated frequencies; meanwhile, harmonic pollution of all public power grids in the testing process is controlled, the influence of harmonic current and voltage components on the testing process is greatly reduced, and the testing accuracy is improved.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The test circuit is used for testing the power conversion device to be tested, and the device to be tested comprises a rectifier and a frequency converter which are connected, and is characterized by comprising a first filter, a second filter, a first inverter circuit, a third filter, an alternating current contactor, a first isolation type transformer, a second inverter circuit and a controller;
the input end of the first filter is connected with a weak power grid, and the output end of the first filter is connected with the input end of the first inverter circuit; the output end of the first inverter circuit is connected with the input end of the second inverter circuit; the output end of the second inverter circuit is connected with the input end of the second filter, and the output end of the second filter is connected with the input end of the rectifier in the device to be tested and the output end of the first isolation transformer;
the output end of the frequency converter in the device to be tested is connected with the input end of the third filter, the output end of the third filter is connected with one end of the alternating current contactor, and the other end of the alternating current contactor is connected with the input end of the first isolation transformer;
the first control end of the first inverter circuit, the second control end of the second inverter circuit and the third control end of the frequency converter in the device to be tested are all electrically connected with the controller.
2. The test circuit for a weak grid high power conversion device of claim 1, further comprising a second isolation transformer; the second isolation type transformer is arranged in series between the weak current network and the input end of the first filter.
3. The test circuit for a high-power conversion device for a weak grid according to claim 1, wherein the first inverter circuit and the second inverter circuit are each a bridge inverter circuit composed of 6 IGBT elements, and gates of the IGBT elements are connected to the controller as control terminals.
4. The test circuit for a weak grid high power conversion device of claim 1, wherein the first filter, the second filter and the third filter are all LC sine wave filters.
5. The test circuit for a weak grid high power conversion device of claim 1, wherein the primary-to-secondary side transformation ratio of the first isolation transformer is 1: (1.05-1.1).
6. The test circuit for a weak grid high power conversion device according to claim 1, further comprising a fuse connected in series between an output of a rectifier and an input of a frequency converter in the device under test.
7. The test circuit for a weak grid high power conversion device of claim 2, further comprising a switching element disposed between the second isolation transformer and the input of the first filter.
8. The test circuit for a weak grid high power conversion device of claim 7, wherein the switching element is a fused switching element.
9. The test circuit for a weak grid high power conversion device according to claim 1, further comprising an incoming line filter disposed in series at a front end of an input end of a rectifier in the device to be tested.
10. A control method for a test circuit of a weak grid high power conversion apparatus, the control method being applied to the test circuit for a weak grid high power conversion apparatus according to any one of claims 1 to 9, the method comprising:
the controller acquires first phase information of a first monitoring point; the first monitoring point is a connection point between the output end of the second filter and the output end of the first isolation transformer;
the controller controls the alternating current output by the device to be tested to be identical with the first phase information according to the first phase information;
the controller acquires circuit detection information of the second monitoring point; the circuit detection information comprises current and voltage of a second monitoring point; the second monitoring point is a connection point between the output end of the frequency converter and the input end of the third filter;
and the controller controls the real-time output power of the device to be tested according to the circuit detection information so as to test the working condition of the device to be tested.
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