CN113945789A - Full-load testing device and method for output voltage amplitude and phase of phase-shifting transformer - Google Patents

Full-load testing device and method for output voltage amplitude and phase of phase-shifting transformer Download PDF

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CN113945789A
CN113945789A CN202111202133.3A CN202111202133A CN113945789A CN 113945789 A CN113945789 A CN 113945789A CN 202111202133 A CN202111202133 A CN 202111202133A CN 113945789 A CN113945789 A CN 113945789A
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phase
voltage
transformer
shifting transformer
output voltage
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CN113945789B (en
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李峰
曹华珍
余梦泽
李作红
刘若平
韦斌
隋宇
邓小玉
王向兵
陈亚彬
袁佳歆
杨欣宜
许顺凯
梅佳骏
张伟哲
陈鹤冲
洪永贵
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Guangdong Power Grid Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention discloses a device and a method for testing the output voltage amplitude and phase full load of a phase-shifting transformer, wherein the device comprises: the three-phase voltage source, the voltage regulator, the step-up transformer, the phase-shifting transformer and the inductor are connected in sequence; the phase-shifting transformer comprises an excitation transformer and a series transformer which are connected in sequence; one end of the inductor is connected with the output end of the series transformer, and the other end of the inductor is connected with the input end of the excitation transformer. The device and the method for testing the output voltage amplitude and the phase full load of the phase-shifting transformer can obviously reduce the power supply capacity required by the full load test of the phase-shifting transformer, can obviously reduce the current required to be born by a switch in a circuit, further reduce the total loss of the circuit, are beneficial to prolonging the service life of the device, and have the advantages of simple operation and strong applicability.

Description

Full-load testing device and method for output voltage amplitude and phase of phase-shifting transformer
Technical Field
The invention relates to the technical field of phase-shifting transformer testing, in particular to a device and a method for testing the output voltage amplitude and the phase full load of a phase-shifting transformer.
Background
In order to ensure the operation economy and safety of the power system, effective power flow regulation and control means are often needed, the phenomenon of unreasonable power flow distribution in the interconnected power grid is solved, power flow oscillation in the interconnected power grid is restrained, and the load capacity and safety level of the existing network are improved. The phase-shifting transformer realizes the longitudinal phase-shifting function by injecting a quadrature voltage into a circuit, and realizes the transverse phase-shifting (voltage regulating) function by injecting an in-phase voltage. Therefore, the arrangement of the phase-shifting transformer in the power grid is an effective means for controlling the power transmission flow, and can realize steady-state flow and voltage control.
With the wide application of the phase-shifting transformer, the test method for accurately measuring the amplitude and the phase of the output voltage of the phase-shifting transformer is concerned. However, the existing testing method for measuring the output voltage of the phase-shifting transformer is complex in equipment, and when the amplitude or the phase of the output voltage of the phase-shifting transformer in a full-load state is measured, the required power capacity far exceeds the general laboratory conditions, which is not beneficial to the test. Meanwhile, the current which needs to be borne by the switch in the circuit during the experiment is often too large, so that great loss is caused to the equipment, and the service life of the equipment is seriously influenced.
Disclosure of Invention
The invention aims to provide a full-load test device and a full-load test method for the output voltage amplitude and the phase of a phase-shifting transformer, and aims to solve the problems that in the prior art, when the output voltage amplitude or the phase of the phase-shifting transformer is measured in a full-load state, the power supply capacity is required to be overlarge, and large loss is easily caused to equipment.
In order to achieve the above object, the present invention provides a full-load testing apparatus for output voltage amplitude and phase of a phase-shifting transformer, comprising:
the three-phase voltage source, the voltage regulator, the step-up transformer, the phase-shifting transformer and the inductor are connected in sequence;
the phase-shifting transformer comprises an excitation transformer and a series transformer which are connected in sequence; one end of the inductor is connected with the output end of the series transformer, and the other end of the inductor is connected with the input end of the excitation transformer.
Further, preferably, the operating voltage of the three-phase voltage source is 380V.
Further, preferably, the voltage regulating range of the voltage regulator is 0-650V.
Further, preferably, the operating voltage of the phase-shifting transformer is 10 KV.
Further, preferably, the step-up transformer is a Y-triangular step-up transformer.
Further, preferably, the working voltage of the Y-triangular step-up transformer is 400V/10 kV.
The invention also provides a full-load test method for the output voltage amplitude and the phase of the phase-shifting transformer, which comprises the following steps:
boosting the voltage regulator to a preset value;
respectively switching a primary winding and a secondary winding of the phase-shifting transformer to different gears;
measuring the three-phase voltage compensated by the phase-shifting transformer when the phase-shifting transformer is positioned at different gears and the corresponding system head end voltage;
and calculating the output voltage of the phase-shifting transformer during full-load operation by using the three-phase voltage and the voltage at the head end of the system.
Further, preferably, the preset value is 400V.
Further, preferably, the three-phase voltage and the system head end voltage are measured with a voltage sensor.
Further, preferably, the calculating the output voltage of the phase-shifting transformer during full-load operation by using the three-phase voltage and the system head-end voltage includes:
acquiring a corresponding three-phase voltage vector and a corresponding system head end voltage vector according to the three-phase voltage and the system head end voltage;
the three-phase voltage vector is differed with the voltage vector of the head end of the system to obtain an output voltage vector when the phase-shifting transformer runs in full load;
and obtaining the output voltage of the phase transformer when the phase transformer runs in full load according to the output voltage vector.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a device and a method for testing the output voltage amplitude and phase full load of a phase-shifting transformer, wherein the device comprises: the three-phase voltage source, the voltage regulator, the step-up transformer, the phase-shifting transformer and the inductor are connected in sequence; the phase-shifting transformer comprises an excitation transformer and a series transformer which are connected in sequence; one end of the inductor is connected with the output end of the series transformer, and the other end of the inductor is connected with the input end of the excitation transformer.
The device and the method for testing the output voltage amplitude and the phase full load of the phase-shifting transformer can obviously reduce the power supply capacity required by the full load test of the phase-shifting transformer, can obviously reduce the current required to be born by a switch in a circuit, further reduce the total loss of the circuit, are beneficial to prolonging the service life of the device, and have the advantages of simple operation and strong applicability.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a phase-shifting transformer output voltage amplitude and phase full-load testing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art phase shifting transformer output voltage amplitude and phase full load test wiring according to an embodiment of the present invention;
FIG. 3 is a vector diagram of output voltage amplitude and phase full-load test voltage and current of a conventional phase-shifting transformer according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a phase-shifting transformer output voltage amplitude and phase full-load testing apparatus according to another embodiment of the present invention;
FIG. 5 is a vector diagram of output voltage amplitude versus phase loading test voltage current for an improved phase shifting transformer according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a method for testing the output voltage amplitude and phase full load of the phase-shifting transformer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention 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.
The terms "comprises" and "comprising" indicate the presence of the described 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.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the invention provides a full-load testing apparatus for output voltage amplitude and phase of a phase-shifting transformer, including:
the three-phase voltage source 01, the voltage regulator 02, the booster transformer 03, the phase-shifting transformer 04 and the inductor 05 are connected in sequence;
wherein, the phase-shifting transformer 04 comprises an excitation transformer 041 and a series transformer 042 which are connected in sequence; one end of the inductor 05 is connected to the output end of the series transformer 042, and the other end is connected to the input end of the excitation transformer 041.
To assist understanding, prior to describing the solution of the embodiment of the present invention, the following description is first made on the conventional test principle for measuring the output voltage amplitude and phase full load of the phase shifting transformer:
referring to fig. 2, fig. 2 is a schematic diagram of a conventional phase shifting transformer output voltage amplitude and phase full load test wiring diagram. Wherein each is in AS、BS、CSAn inductance L is added between the inductor and the ground. A. theS、BS、CSThe measured voltage is the head end of the system, namely the voltage of the input phase-shifting transformer; a. theS′、BS′、CSThe voltage measured at the position is the voltage compensated by the phase-shifting transformer, and the output voltage vector of the phase-shifting transformer in full-load operation can be obtained by subtracting the voltage vector at the head end of the system from the voltage vector compensated by the phase-shifting transformer corresponding to the phase
Figure BDA0003305386190000051
The voltage applied at the two ends of the inductor L is the voltage compensated by the phase-shifting transformer
Figure BDA0003305386190000052
Setting the full load current of the phase-shifting transformer as IallIn order to fully load the phase-shifting transformer, the inductance L is adjusted so that the value of the inductance L satisfies:
Figure BDA0003305386190000053
wherein, f is 50Hz,
IL＝Iall-Iloss (2)
in the formula IlossIs the sum of the current of a phase-shifting transformer and the current for excitation and the like. Wherein the voltage-current vector is shown in figure 3 for full load operation.
Further, AS、BS、CSPoint current is IAall、IBall、ICallThe power consumed by the inductance group is the reactive power QL：
QL＝3Vs′IL (3)
Because the current flowing through the circuit is very large when the circuit runs in full load, the voltage regulator, the Y-delta step-up transformer, the phase-shifting transformer, copper loss and the like are not negligible. Setting the running losses of the voltage regulator, the Y-delta step-up transformer, the phase-shifting transformer and the transformer to be W respectivelyVRa、WSTa、WPSTaThus capacity S of the Y-delta step-up transformerSTAnd the capacity S of the voltage regulatorVRThe method comprises the following steps:
SST>WSTa+WPSTa+jQL (4)
SVR>WVRa+WSTa+WPSTa+jQL (5)
therefore, the amplitude of the output voltage of the phase-shifting transformer and the phase full-load test power supply capacity Sall-loadThe method comprises the following steps:
Sall-load>WVRa+WSTa+WPSTa+jQL (6)
meanwhile, the switch groups K1, K2 and K3 are required to be capable of carrying full load current.
And if the rated capacity of the phase-shifting transformer to be tested is 220MVA and the rated current of the power grid side is 1.3kA, the output voltage amplitude and the power supply capacity required by the phase-shifting transformer in the phase full-load test are far larger than the three-phase power supply capacity which can be provided by a common laboratory.
Therefore, in order to greatly reduce the power capacity required by the test and the capacities of the voltage regulator and the Y- Δ step-up transformer, the embodiment of the present invention provides an improved apparatus for testing the output voltage amplitude and the phase full load of the phase-shifting transformer, as shown in fig. 4:
specifically, in this embodiment, the original ground terminal of the inductor is connected to the input terminal of the phase-shifting transformer. Test connection is changed, and the inductor L is connected with A 'originally's、BS′、CSInstead of connecting to ground at AS、BS、CSAnd AS′、BS′、CS' between. The currents labeled in fig. 1 therefore satisfy the following relation:
Figure BDA0003305386190000061
thus, it is possible to obtain:
Figure BDA0003305386190000062
further, a vector diagram of the output voltage amplitude and the phase full-load test voltage current of the improved phase-shifting transformer is shown in fig. 5. As can be seen from FIG. 5, Is<<IallThus modified test Power supply to AS、BS、CSThe current flowing in the point circuit is far smaller than that in the original test circuit. The currents carried by the K1, K2 and K3 switch groups are greatly reduced, and the loss W 'of the voltage regulator and the Y-delta step-up transformer is reduced'VRaAnd W'STaGreatly reducing the cost. At this time, the voltage applied to the two ends of the inductor L' is the output voltage V of the phase-shifting transformerPSTTherefore, the inductance values required for the improved test wiring method are:
Figure BDA0003305386190000071
due to VPST<<V′sL of'<<L, the inductance required for the test was reduced after modification.
The power consumed by the improved inductor group is reactive power Q'L：
Q′L＝3VPSTIL (10)
And satisfy Q'L<<QL。
Further, capacity S 'of Y-delta step-up transformer'STAnd regulator capacity S'VRThe method comprises the following steps:
S′ST>W′STa+WPSTa+jQ′L (11)
S′VR>W′VRa+W′STa+WPSTa+jQ′L (12)
thus, the phase shift is changedTransformer output voltage amplitude and phase full-load test power supply capacity S'all-loadThe method comprises the following steps:
S′all-load>W′VRa+W′STa+WPSTa+jQ′L (13)
due to Q'L<<QLThus, therefore, it is
Figure BDA0003305386190000072
And the amplitude of the output voltage of the phase-shifting transformer and the phase full-load test power supply capacity S'all-loadCan be provided by a common test three-phase power supply. Therefore, the output voltage amplitude and phase full-load test device of the phase-shifting transformer provided by the embodiment can obviously reduce the power capacity required by the full-load test of the phase-shifting transformer, and can obviously reduce the current required to be borne by the switch in the circuit, so that the total loss of the circuit is reduced, the service life of the device is prolonged, and the device has the advantages of simplicity in operation and high applicability.
In a specific embodiment, the apparatus for performing the testing method based on the amplitude of the output voltage of the phase-shifting transformer and the phase full-load testing apparatus specifically comprises:
1 380V and 50Hz three-phase voltage source, 1 380V/(0-650V) 1250kVA three-phase voltage regulator, 1 400V/10kV Y-triangle-connected transformer, 3 11kV/110V voltage transformers, (10-35 kV, 0.1 level), 3 10kV/100V voltage transformers, (10kV, 0.5 level), 3 25A/5A current transformers, (10-35 kV, 0.1 level), 3 reactors, 1 multimeter, 1 three-phase electric energy quality analyzer and 1 four-channel isolation oscilloscope.
Further, in a specific embodiment, the steps of performing the testing method based on the amplitude and phase full load testing apparatus of the output voltage of the phase-shifting transformer are shown in fig. 6, and specifically include the following steps:
and S10, boosting the voltage regulator to a preset value.
In this step, when the voltage regulator is adjusted, the voltage regulator is mainly adjusted slowly (gradually) to a preset value, and optionally, the preset value is usually 400V. It should be noted that, setting the preset value to 400V is only a preferable mode provided in this embodiment, and in practical application, the preset value can be flexibly adjusted according to experimental needs, and is not limited herein.
And S20, respectively switching the primary winding and the secondary winding of the phase-shifting transformer to different gears.
And S30, measuring the three-phase voltage compensated by the phase-shifting transformer when the phase-shifting transformer is positioned at different gears and the corresponding system head-end voltage.
In the step, the three-phase voltage V compensated by the phase-shifting transformer when the phase-shifting transformer is positioned at different gears is measured by mainly utilizing a voltage sensor PTsC′、VsB′、VsA' and System head end Voltage VsC、VsB、VsA。
And S40, calculating the output voltage of the phase-shifting transformer during full-load operation by using the three-phase voltage and the system head end voltage.
In this step, the voltage vector at the head end of the system is subtracted from the compensated voltage vector of the corresponding phase of the phase-shifting transformer to obtain the output voltage vector of the phase-shifting transformer when the phase-shifting transformer runs in full load
Figure BDA0003305386190000081
Namely, it is
Figure BDA0003305386190000082
It can be understood that the above steps are only performed for testing a certain gear, and since a plurality of gears need to be tested, the amplitude and phase of the output voltage of different gears of the phase-shifting transformer under the full load condition can be obtained by repeating the steps S20-S40.
It should be noted that in the description of the present specification, reference to the description of the term "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a full load test device of phase-shifting transformer output voltage amplitude and phase place which characterized in that includes:
the three-phase voltage source, the voltage regulator, the step-up transformer, the phase-shifting transformer and the inductor are connected in sequence;
the phase-shifting transformer comprises an excitation transformer and a series transformer which are connected in sequence; one end of the inductor is connected with the output end of the series transformer, and the other end of the inductor is connected with the input end of the excitation transformer.
2. The apparatus of claim 1, wherein the three-phase voltage source has an operating voltage of 380V.
3. The device for testing the amplitude and the phase full load of the output voltage of the phase-shifting transformer according to claim 1, wherein the voltage regulating range of the voltage regulator is 0-650V.
4. The apparatus for testing output voltage amplitude and phase full load of the phase-shifting transformer according to claim 1, wherein the operating voltage of the phase-shifting transformer is 10 KV.
5. The apparatus of claim 1, wherein the step-up transformer is a Y-delta step-up transformer.
6. The apparatus for testing output voltage amplitude and phase full load of phase shifting transformer according to claim 5, wherein said Y-triangular step-up transformer has a working voltage of 400V/10 kV.
7. A full-load test method for output voltage amplitude and phase of a phase-shifting transformer is characterized by comprising the following steps:
boosting the voltage regulator to a preset value;
respectively switching a primary winding and a secondary winding of the phase-shifting transformer to different gears;
measuring the three-phase voltage compensated by the phase-shifting transformer when the phase-shifting transformer is positioned at different gears and the corresponding system head end voltage;
and calculating the output voltage of the phase-shifting transformer during full-load operation by using the three-phase voltage and the voltage at the head end of the system.
8. The method of claim 7, wherein the predetermined value is 400V.
9. The method of claim 7, wherein the three-phase voltage and the system head voltage are measured by a voltage sensor.
10. The method for testing the amplitude and the phase full load of the output voltage of the phase-shifting transformer according to claim 7, wherein the step of calculating the output voltage of the phase-shifting transformer during the full load operation by using the three-phase voltage and the voltage at the head end of the system comprises the following steps:
acquiring a corresponding three-phase voltage vector and a corresponding system head end voltage vector according to the three-phase voltage and the system head end voltage;
the three-phase voltage vector is differed with the voltage vector of the head end of the system to obtain an output voltage vector when the phase-shifting transformer runs in full load;
and obtaining the output voltage of the phase transformer when the phase transformer runs in full load according to the output voltage vector.
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Title
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