CN113945789B - Phase-shifting transformer output voltage amplitude and phase full-load test device and test method - Google Patents
Phase-shifting transformer output voltage amplitude and phase full-load test device and test method Download PDFInfo
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- CN113945789B CN113945789B CN202111202133.3A CN202111202133A CN113945789B CN 113945789 B CN113945789 B CN 113945789B CN 202111202133 A CN202111202133 A CN 202111202133A CN 113945789 B CN113945789 B CN 113945789B
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- 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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The invention discloses a full load test device and a full load test method for the amplitude and the phase of the output voltage 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 exciting transformer and a series transformer which are sequentially connected; 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 exciting transformer. The phase-shifting transformer output voltage amplitude and phase full-load test device and the test method thereof can obviously reduce the power supply capacity required by the phase-shifting transformer full-load test, and can obviously reduce the current required to be born by a switch in a circuit, so that the total loss of the circuit is reduced, the service life of the device is prolonged, and the phase-shifting transformer full-load test device and the test method thereof have the advantages of simplicity in operation and strong applicability.
Description
Technical Field
The invention relates to the technical field of phase-shifting transformer testing, in particular to a phase-shifting transformer output voltage amplitude and phase full-load test device and a phase full-load test method.
Background
In order to ensure the running economy and safety of the power system, effective means for regulating and controlling the power flow are often required, the phenomenon of unreasonable power flow distribution in the interconnected power grid is solved, the power flow oscillation in the interconnected power grid is restrained, and the load capacity and the safety level of the existing network are improved. The phase-shifting transformer realizes a longitudinal phase-shifting function by injecting a quadrature voltage into a circuit, and realizes a transverse phase-shifting (voltage regulating) function by injecting an in-phase voltage. Thus, providing a phase-shifting transformer in the grid is an effective means of controlling the power flow of the power transmission, which enables steady state power flow and voltage control.
Along with the wide application of the phase-shifting transformer, a test method for accurately measuring the amplitude and the phase of the output voltage of the phase-shifting transformer is attracting attention. However, the existing test method for measuring the output voltage of the phase-shifting transformer often uses complicated equipment, and when the amplitude or phase of the output voltage of the phase-shifting transformer is measured in a full-load state, the required power supply capacity is far beyond the common laboratory conditions, which is not beneficial to the test. Meanwhile, the current required to be born by a switch in the circuit is often too large in experiment, so that larger loss can be caused to 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, which are used for solving 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 easy to cause to equipment.
In order to achieve the above object, the present invention provides a phase-shifting transformer output voltage amplitude and phase full load test device, 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 exciting transformer and a series transformer which are sequentially connected; 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 exciting transformer.
Further, preferably, the working voltage of the three-phase voltage source is 380V.
Further, preferably, the voltage regulator has a voltage regulating range of 0-650V.
Further, preferably, the operating voltage of the phase-shifting transformer is 10KV.
Further, preferably, the step-up transformer is a Y-delta step-up transformer.
Further, preferably, the operating voltage of the Y-delta step-up transformer is 400V/10kV.
The invention also provides a phase-shifting transformer output voltage amplitude and phase full-load test method, 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 when the phase-shifting transformer is in full operation by using the three-phase voltage and the system head-end voltage.
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 in the full operation using the three-phase voltage and the system head-end voltage includes:
acquiring corresponding three-phase voltage vectors and system head-end voltage vectors according to the three-phase voltages and the system head-end voltage;
the three-phase voltage vector is subjected to difference with the voltage vector at the head end of the system, so that an output voltage vector of the phase-shifting transformer in full-load operation is obtained;
and obtaining the output voltage of the phase transformer when the phase transformer runs fully according to the output voltage vector.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a phase-shifting transformer output voltage amplitude and phase full-load test device and a method, wherein the device comprises the following steps: 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 exciting transformer and a series transformer which are sequentially connected; 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 exciting transformer.
The phase-shifting transformer output voltage amplitude and phase full-load test device and the test method thereof can obviously reduce the power supply capacity required by the phase-shifting transformer full-load test, and can obviously reduce the current required to be born by a switch in a circuit, so that the total loss of the circuit is reduced, the service life of the device is prolonged, and the phase-shifting transformer full-load test device and the test method thereof have the advantages of simplicity in operation and strong applicability.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed 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 that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a phase-shifting transformer output voltage amplitude and phase full-load test apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the output voltage amplitude and phase full load test wiring of a prior art phase shifting transformer according to one embodiment of the present invention;
FIG. 3 is a graph illustrating the output voltage amplitude versus phase full load test voltage and current vector of a conventional phase shifting transformer according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an apparatus for testing output voltage amplitude and phase full load of a phase-shifting transformer according to another embodiment of the present invention;
FIG. 5 is a graph of improved output voltage magnitude versus phase full load test voltage current vector for a phase shifting transformer in accordance with one embodiment of the present invention;
fig. 6 is a flow chart of a method for testing the amplitude and phase full load of the output voltage of the phase-shifting transformer according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 step numbers used herein are for convenience of description only and are not limiting as to the order in which the steps are performed.
It is 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.
The terms "comprises" and "comprising" indicate 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.
The term "and/or" refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, an embodiment of the present invention provides a phase-shifting transformer output voltage amplitude and phase full load test apparatus, including:
the three-phase voltage source 01, the voltage regulator 02, the step-up transformer 03, the phase-shifting transformer 04 and the inductor 05 are connected in sequence;
the phase-shifting transformer 04 comprises an excitation transformer 041 and a series transformer 042 which are sequentially connected; one end of the inductor 05 is connected with the output end of the series transformer 042, and the other end is connected with the input end of the exciting transformer 041.
To assist understanding, prior to describing the scheme of the embodiment of the present invention, the following description is first made on the existing principle of measuring the output voltage amplitude and phase full load test of the phase-shifting transformer:
referring to fig. 2, fig. 2 is a schematic diagram of the wiring of the output voltage amplitude and phase full load test of the conventional phase-shifting transformer. Wherein, respectively at、/>、/>Adding inductance between the ground and the ground>。/>、/>、/>The measured voltage is the voltage of the head end of the system, namely the voltage input into the phase-shifting transformer; />、/>、/>The measured voltage 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 of the corresponding phase>. Inductance->The voltage applied at two ends is the voltage compensated by the phase-shifting transformer +.>Let the phase-shifting transformer full-load current be +.>In order to make the phase-shifting transformer run at full load, the inductance needs to be adjusted>So that the inductance->The values of (2) satisfy:
（1）
in the method, in the process of the invention,,
（2）
in the method, in the process of the invention,which is the sum of the phase-shifting transformer and the current used for excitation, etc. Wherein the voltage current vector is shown in fig. 3 when operating at full.
Further, the method comprises the steps of,、/>、/>the point current is->、/>、/>The power consumed by the inductance group is reactive power +.>：
（3）
Because the current flowing in the circuit is very large in full-load operation, the voltage regulator, the Y-delta step-up transformer,The phase-shifting transformer and copper loss are not negligible. Let the operation losses of the voltage regulator, the Y-delta step-up transformer, the phase-shifting transformer and the like be respectively、/>、/>Thus Y-delta step-up transformer capacity +.>Capacity of voltage regulator>The method is to satisfy the following steps:
（4）
（5）
therefore, the phase-shifting transformer outputs voltage amplitude and phase full-load test power supply capacityThe method is to satisfy the following steps:
（6）
at the same time, the switch sets K1, K2, K3 are required to be able to carry full load current.
And if the rated capacity of the phase-shifting transformer to be measured is 220MVA and the rated current of the power grid side is 1.3kA, the power supply capacity required by the phase-shifting transformer output voltage amplitude and phase full load test is far greater than the three-phase power supply capacity provided by a general laboratory.
Therefore, in order to greatly reduce the power supply capacity required by the test and the capacities of the voltage regulator and the Y-delta step-up transformer, the embodiment of the invention provides an improved phase-shifting transformer output voltage amplitude and phase full load test device, as shown in fig. 4:
specifically, in this embodiment, the original ground of the inductor is connected to the input of the phase-shifting transformer. Changing the test wiring, inductanceFrom the original joint->、/>、/>Is connected with the ground instead>、/>、/>And->、/>、/>And (3) the room(s). The current labeled in fig. 1 therefore satisfies the following relationship:
（7）
thus, it is possible to obtain:
（8）
further, the improved phase-shifting transformer inputThe voltage magnitude and phase full load test voltage current vector diagram is shown in fig. 5. As can be seen from figure 5 of the drawings,thus improved test power supply to +.>、/>、/>The current flowing in the dot circuit is much smaller than in the original test circuit. The current required to be carried by the K1, K2 and K3 switch groups is greatly reduced, and the loss of the voltage regulator and the Y-delta step-up transformer is reduced>And->Greatly reduces the cost. At this time, inductance->The voltage applied at two ends is the output voltage of the phase-shifting transformer>Therefore, the inductance value required by the improved test wiring method is as follows:
（9）
due toThus->The inductance value required for the test after improvement is reduced.
The power consumed by the inductance group after improvement is reactive power：
（10）
And satisfy the following。
Further, Y-delta boost transformer capacityCapacity of voltage regulator>The method is to satisfy the following steps:
（11）
（12）
therefore, the phase-shifting transformer outputs voltage amplitude and phase full-load test power supply capacityThe method is to satisfy the following steps:
（13）
due toThus, it is
（14）
And the phase-shifting transformer outputs voltage amplitude and phase full-load test power capacityCan be obtained by common testAnd providing a three-phase power supply. Therefore, the phase-shifting transformer output voltage amplitude and phase full-load test device provided by the embodiment can obviously reduce the power supply capacity required by the phase-shifting transformer full-load test, and can obviously reduce the current required to be born by a switch in a circuit, so that the total loss of the circuit is reduced, the service life of the device is prolonged, and the phase-shifting transformer full-load test device has the advantages of simplicity in operation and strong applicability.
In a specific embodiment, the device for performing the test method based on the phase-shifting transformer output voltage amplitude and phase full-load test device specifically comprises:
380V, 1 of 50Hz three-phase voltage sources, 1 of 380V/(0-650V) 1250kVA three-phase voltage regulators, 1 of 400V/10kV Y-triangle wiring transformers, 3 of 11kV/110V voltage transformers, (10-35 kV,0.1 level), 3 of 10kV/100V voltage transformers, (10 kV,0.5 level), 3 of 25A/5A current transformers, (10-35 kV,0.1 level), 3 of reactors, 1 of universal meters, 1 of three-phase power quality analyzers and 1 of four-channel isolation oscilloscopes.
Further, in a specific embodiment, based on the output voltage amplitude and phase full load test device of the phase-shifting transformer, the steps of the test method are shown in fig. 6, and specifically include the following steps:
s10, boosting the voltage regulator to a preset value.
In this step, the regulator is adjusted, mainly slowly (gradually), to a preset value, typically 400V, as an alternative. It should be noted that, setting the preset value to 400V is only a preferred manner provided in this embodiment, and in practical application, the preset value may be flexibly adjusted according to the experimental requirement, which is not limited in any way.
S20, respectively switching the primary winding and the secondary winding of the phase-shifting transformer to different gears.
S30, measuring the three-phase voltage compensated by the phase-change transformer when the phase-change transformer is positioned at different gears and the corresponding system head-end voltage.
In the step, the voltage sensor PT is mainly used for measuring the phase-shifting voltage regulator for the phase-shifting voltage regulator when the phase-shifting voltage regulator is positioned at different gearsCompensated three-phase voltage、/>、/>And system head-end voltage +.>、/>、/>。
S40, calculating the output voltage of the phase-shifting transformer when the phase-shifting transformer is in full operation by utilizing the three-phase voltage and the system head-end voltage.
In the step, the voltage vector of the head end of the system is subtracted from the voltage vector compensated by the phase-shifting transformer of the corresponding phase to obtain the output voltage vector of the phase-shifting transformer in full-load operationI.e. +.>。
It can be understood that the above steps are only tests for a certain gear, and since a plurality of gears need to be tested, the output voltage amplitude and phase 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, descriptions of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. The full load test method for the amplitude and the phase of the output voltage of the phase-shifting transformer is applied to a full load test device for the amplitude and the phase of the output voltage of the phase-shifting transformer and is characterized by comprising the following steps of: 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;
calculating the output voltage of the phase-shifting transformer when the phase-shifting transformer is fully operated by utilizing the three-phase voltage and the system head-end voltage; the calculating the output voltage of the phase-shifting transformer when the phase-shifting transformer is in full operation by using the three-phase voltage and the system head-end voltage comprises the following steps: acquiring corresponding three-phase voltage vectors and system head-end voltage vectors according to the three-phase voltages and the system head-end voltage; the three-phase voltage vector is subjected to difference with the voltage vector at the head end of the system, so that an output voltage vector of the phase-shifting transformer in full-load operation is obtained; obtaining the output voltage of the phase-shifting transformer when the phase-shifting transformer is fully operated according to the output voltage vector;
the full-load test device for the output voltage amplitude and the phase of the phase-shifting transformer comprises a three-phase voltage source, a voltage regulator, a step-up transformer, a phase-shifting transformer and an inductor which are sequentially connected, wherein the phase-shifting transformer comprises an excitation transformer and a series transformer which are sequentially connected; 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 exciting transformer.
2. The method of claim 1, wherein the predetermined value is 400V.
3. The phase-shifting transformer output voltage amplitude and phase full load test method of claim 1, wherein the three-phase voltage and the system head-end voltage are measured using a voltage sensor.
4. The method of claim 1, wherein the operating voltage of the three-phase voltage source is 380V.
5. The method for testing the amplitude and 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.
6. The method of claim 1, wherein the operating voltage of the phase-shifting transformer is 10KV.
7. The method of claim 1, wherein the step-up transformer is a Y-delta step-up transformer.
8. The method of claim 7, wherein the Y-delta step-up transformer has an operating voltage of 400V/10kV.
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