CN109697335B - Self-leakage inductance calculation method, device and equipment for transformer and storage medium - Google Patents
Self-leakage inductance calculation method, device and equipment for transformer and storage medium Download PDFInfo
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- CN109697335B CN109697335B CN201910042627.6A CN201910042627A CN109697335B CN 109697335 B CN109697335 B CN 109697335B CN 201910042627 A CN201910042627 A CN 201910042627A CN 109697335 B CN109697335 B CN 109697335B
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Abstract
The invention discloses a self-leakage inductance calculation method for a transformer, which is applied to solve the self-leakage inductance of the low voltage side and the self-leakage inductance of the high voltage side of the transformer before iron cores are not installed on the high voltage winding side and the low voltage winding side of the transformer. Before the iron core is not inserted into the winding of the transformer, voltage is applied to the high-voltage winding side and the low-voltage winding side, so that the iron core of the transformer is equivalent to a saturation state, the self-leakage inductance of the transformer is measured and calculated under the condition that the iron core of the transformer is equivalent to the saturation state, the difference error between the calculated self-leakage inductance and the actual self-leakage inductance of the transformer is correspondingly reduced, and correspondingly, the difference between the established T-shaped equivalent circuit model of the transformer and the actual performance of the transformer is smaller. In addition, the invention also discloses a self-leakage inductance calculation device, equipment and a storage medium for the transformer, and the effects are as above.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a self-leakage inductance calculation method, a self-leakage inductance calculation device, self-leakage inductance calculation equipment and a storage medium for a transformer.
Background
The transformer is used as an important component of a power system, and the electromagnetic characteristics of the transformer play a crucial role in the normal operation and performance of the power system, so that the construction of an accurate mathematical or simulation model for describing the transient characteristics of the transformer is crucial to the analysis of the power system.
At present, a magnetic field-based modeling method, a circuit-based modeling method and a magnetic circuit-based modeling method are mainly used as mathematical modeling methods for a transformer, a T-shaped equivalent circuit model established by the circuit-based method is a commonly adopted model, when the T-shaped equivalent circuit model is established, the self-leakage inductance of the transformer needs to be measured, when the self-leakage inductance of the transformer is measured, on one hand, after an iron core is inserted into a winding side of the transformer, the iron core of the transformer can only be in an unsaturated state due to environmental influence, correspondingly, the self-leakage inductance of the transformer can only be measured when the iron core of the transformer is not saturated, but when the iron core is not saturated, the difference between the measured self-leakage inductance and the actual self-leakage inductance of the transformer is larger due to the 'large number of decimal problem', and the difference error is larger, and the difference between the established T-shaped equivalent circuit model of the transformer and the actual transformer performance is larger. On the other hand, after the core is inserted into the winding side of the transformer, the core can be saturated only by increasing the steady-state current and voltage in order to bring the core into a saturated state.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a storage medium for calculating the self leakage inductance of a transformer, which improve the accuracy of the calculated self leakage inductance of the transformer.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
first, an embodiment of the present invention provides a self-leakage inductance calculation method for a transformer, where the self-leakage inductance calculation method is applied to solve the self-leakage inductance of the transformer before an iron core is not installed on both a high-voltage winding side and a low-voltage winding side of the transformer, and the method includes:
acquiring a first high-voltage side voltage applied to the high-voltage winding side and a corresponding first high-voltage side current;
establishing a first equation by using the first high-voltage side voltage, the first high-voltage side current, the excitation inductor and the high-voltage side self-leakage inductor to be solved;
acquiring a low-voltage side voltage applied to the low-voltage winding side and a corresponding low-voltage side current;
establishing a second equation by using the low-voltage side voltage, the low-voltage side current, the excitation inductance and the low-voltage side self-leakage inductance to be solved;
when the low-voltage winding side is short-circuited, acquiring a second high-voltage side voltage applied to the high-voltage winding side and a corresponding second high-voltage side current;
establishing a third equation by using the second high-voltage side voltage, the second high-voltage side current, the high-voltage side self-leakage inductance to be solved and the low-voltage side self-leakage inductance to be solved;
and simultaneously solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved by the first equation, the second equation and the third equation.
Optionally, after the solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved, the method further includes:
and establishing a T-shaped equivalent circuit model of the transformer by using the per-unit value of the low-voltage side self-leakage inductance and the per-unit value of the high-voltage side self-leakage inductance obtained by solving.
Optionally, the process of solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved specifically includes:
simultaneously solving the low-voltage side self-leakage inductance to be solved and the high-voltage side self-leakage inductance to be solved by the first equation, the second equation and the third equation to obtain the low-voltage side self-leakage inductance and the high-voltage side self-leakage inductance;
determining an impedance reference value of the transformer;
and respectively calculating the ratio of the low-voltage side self-leakage inductance to the impedance reference value and the ratio of the high-voltage side self-leakage inductance to the impedance reference value, and correspondingly obtaining a per-unit value of the low-voltage side self-leakage inductance and a per-unit value of the high-voltage side self-leakage inductance.
Optionally, after the obtaining of the first high-voltage-side voltage and the corresponding first high-voltage-side current applied to the high-voltage winding side, the method further includes:
judging whether the first high-voltage side current exceeds a high-voltage side rated current, if so, carrying out first early warning prompt to enable a target person to adjust the first high-voltage side voltage;
correspondingly, after the obtaining of the low-voltage side voltage and the corresponding low-voltage side current applied on the low-voltage winding side, the method further comprises the following steps:
and judging whether the low-voltage side current exceeds the low-voltage side rated current, and if so, performing second early warning prompt to enable the target personnel to adjust the low-voltage side voltage.
Optionally, after the obtaining of the second high-voltage-side voltage and the corresponding second high-voltage-side current applied to the high-voltage winding side, the method further includes:
and judging whether the second high-voltage side current exceeds the high-voltage side rated current, if so, carrying out third early warning prompt to enable the target personnel to adjust the second high-voltage side voltage.
Second, an embodiment of the present invention provides a self-leakage inductance calculation apparatus for a transformer, where the self-leakage inductance calculation apparatus is applied to solve a self-leakage inductance of the transformer before an iron core is not installed on both a high-voltage winding side and a low-voltage winding side of the transformer, and the apparatus includes:
the first acquisition module is used for acquiring a first high-voltage side voltage applied to the high-voltage winding side and a corresponding first high-voltage side current;
the first establishing module is used for establishing a first equation by utilizing the first high-voltage side voltage, the first high-voltage side current, the excitation inductor and the high-voltage side self-leakage inductor to be solved;
the second acquisition module is used for acquiring low-voltage side voltage applied to the low-voltage winding side and corresponding low-voltage side current;
the second establishing module is used for establishing a second equation by using the low-voltage side voltage, the low-voltage side current, the excitation inductor and the low-voltage side self-leakage inductor to be solved;
the third acquisition module is used for acquiring a second high-voltage side voltage and a corresponding second high-voltage side current which are applied to the high-voltage winding side when the low-voltage winding side is short-circuited;
the third establishing module is used for establishing a third equation by utilizing the second high-voltage side voltage, the second high-voltage side current, the high-voltage side self-leakage inductance to be solved and the low-voltage side self-leakage inductance to be solved;
and the solving module is used for solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved by simultaneously establishing the first equation, the second equation and the third equation.
Optionally, the method further includes:
and the fourth establishing module is used for establishing the T-shaped equivalent circuit model of the transformer by utilizing the per unit value of the low-voltage side self-leakage inductance and the per unit value of the high-voltage side self-leakage inductance obtained through solving.
Optionally, the method further includes:
the first judging module is used for judging whether the first high-voltage side current exceeds the high-voltage side rated current or not, if so, the first prompting module is started,
the first prompt module is used for carrying out first early warning prompt so that a target person can adjust the first high-voltage side voltage;
the second judgment module is used for judging whether the low-voltage side current exceeds the low-voltage side rated current or not, and if so, the second judgment module enters the second prompt module;
and the second prompt module is used for carrying out second early warning prompt so as to enable target personnel to adjust the voltage of the low-voltage side.
Third, an embodiment of the present invention provides a self-leakage inductance calculating device for a transformer, where before an iron core is not installed on both a high-voltage winding side and a low-voltage winding side of the transformer, the self-leakage inductance calculating device is applied to solve a self-leakage inductance of the transformer, and the method includes:
a memory for storing a computer program;
a processor for executing a computer program stored in said memory to implement the steps of any of the above mentioned self leakage inductance calculation methods for transformers.
Fourthly, the embodiment of the invention discloses a computer readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the self-leakage-inductance calculation method for the transformer are implemented as described above.
The self-leakage inductance calculation method for the transformer provided by the embodiment of the invention is applied to solve the self-leakage inductance of the low-voltage side and the self-leakage inductance of the high-voltage side of the transformer before an iron core is not mounted on the high-voltage winding side and the low-voltage winding side of the transformer, and specifically, the voltage of the high-voltage side and the voltage of the low-voltage side, the corresponding current of the high-voltage side and the current of the low-voltage side, and the current of the second high-voltage side when the low-voltage side is short-circuited are respectively obtained, a first equation of the high-voltage winding side, a second equation of the low-voltage winding side and a third equation when the low-voltage winding side is short-circuited are correspondingly established according to the excitation inductance of the transformer, and finally three equations can be combined to solve the per unit value of the self-leakage inductance of the low-voltage side and the per unit value of the self-leakage inductance of the high-voltage side. By adopting the scheme, before the iron core is not inserted into the winding side of the transformer, the voltage is applied to the high-voltage winding side and the low-voltage winding side, so that the iron core of the transformer is equivalent to a saturated state, the self-leakage inductance of the transformer is calculated under the condition that the iron core of the transformer is equivalent to the saturated state, the difference error between the calculated self-leakage inductance and the actual self-leakage inductance of the transformer is correspondingly reduced, and correspondingly, the difference between the established T-shaped equivalent circuit model of the transformer and the actual transformer performance is smaller. In addition, the embodiment of the invention also discloses a self-leakage-inductance calculating device, equipment and a storage medium for the transformer, and the effects are as above.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart of a self-leakage inductance calculation method for a transformer according to a first embodiment of the present invention;
fig. 2 is a high-voltage side self-leakage inductance no-load schematic diagram of a high-voltage winding side of a transformer according to an embodiment of the present invention;
fig. 3 is a diagram of a low-voltage side self-leakage inductance no-load principle of a low-voltage winding side of a transformer according to an embodiment of the present invention;
fig. 4 is a self-leakage-inductance no-load schematic diagram when the low-voltage winding side of the transformer is short-circuited according to the embodiment of the present invention;
fig. 5 is a schematic flow chart of a self-leakage inductance calculation method for a transformer according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a self-leakage inductance calculating device for a transformer according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a self-leakage-inductance calculating device for a transformer according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a verification curve for verifying the accuracy of self-leakage inductance 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.
The embodiment of the invention discloses a method, a device, equipment and a storage medium for calculating the self-leakage inductance of a transformer, which improve the accuracy of the calculated self-leakage inductance of the transformer.
The self-leakage inductance calculation method for the transformer is suitable for high-voltage side no-load measurement and low-voltage side no-load measurement before the iron core is not installed on the high-voltage winding side and the low-voltage winding side of the transformer, and when the high-voltage winding side and the low-voltage winding side are in no-load, the self-leakage inductance is measured and calculated by simulating the saturation condition of the iron core on the high-voltage winding side and the low-voltage winding side of the transformer.
Referring to fig. 1, fig. 1 is a schematic flow chart of a self-leakage inductance calculation method for a transformer according to a first embodiment of the present invention, where the method includes:
s10: a first high-side voltage applied at the high-voltage winding side and a corresponding first high-side current are obtained.
S11: and establishing a first equation by using the first high-voltage side voltage, the first high-voltage side current, the excitation inductor and the high-voltage side self-leakage inductor to be solved.
Specifically, in this embodiment, in order to describe step S11 in detail, fig. 2 is provided in an embodiment of the present invention, fig. 2 is a schematic diagram of a high-voltage side self-leakage-inductance no-load test on a high-voltage winding side of a transformer provided in an embodiment of the present invention, when a high-voltage winding side no-load test is performed on the transformer, an excitation inductance is equivalent to a situation when an iron core of the transformer is saturated, a first high-voltage side voltage is applied to the high-voltage winding side in order to ensure that a high-voltage side current on the high-voltage winding side does not exceed a rated current on the high-voltage winding side, and a first equation may specifically be represented by the following formula:
L air1 ＝L 1σ +L' mair
in the above formula, U 1 Is a first high side voltage, I 1 Is the first high side current, L 1σ Is high side self leakage inductance, L 'to be solved' mair For exciting inductance, w is power frequency angular frequency, L air1 For the inductance parameter after application of the first high-side voltage, L air1 Corresponding to the inductance on the high-voltage winding side when the core is saturated.
In FIG. 2, the high side winding resistance R 1σ Is much smaller than the high-voltage side winding inductance L 1σ Inductance value of (1), low-Voltage side winding resistance R' 2σ Is far less than the low-voltage side winding inductance L' 2σ And excitation inductor L' mair Far less than excitation resistor R' m The resistance value of (2).
S12: a low-side voltage applied at the low-side winding side and a corresponding low-side current are obtained.
S13: and establishing a second equation by using the low-voltage side voltage, the low-voltage side current, the excitation inductance and the low-voltage side self-leakage inductance to be solved.
Specifically, in this embodiment, in order to describe step S13 in detail, fig. 3 is provided in an embodiment of the present invention, fig. 3 is a low-voltage side self-leakage inductance no-load schematic diagram of a low-voltage winding side of a transformer provided in an embodiment of the present invention, when a low-voltage winding side no-load experiment is performed on the transformer, an excitation inductance is equivalent to a situation when an iron core of the transformer is saturated, a low-voltage side voltage is applied to the low-voltage winding side in order to ensure that a low-voltage side current of the low-voltage winding side does not exceed a rated current of the low-voltage winding side, and the second equation may specifically be represented by the following formula:
L' air2 ＝L' 2σ +L' mair
in the above formula, U 2 Is a low side voltage, I 2 Is low side current, L' 2σ To solve for low side self-leakage inductance, L air2 For the inductance parameter on the low-voltage winding side after the application of the low-voltage side voltage, L air2 Corresponding to the inductance of the low-voltage winding when the core is saturated. Wherein, L' air2 The following can be used for calculation:
L' air2 ＝k 2 L air2
wherein k is the transformation ratio of the transformer.
In fig. 3, the size comparison of each parameter can be referred to the description in fig. 2, and the embodiment of the present invention is not described herein again.
S14: and acquiring a second high-voltage side voltage applied to the high-voltage winding side and a corresponding second high-voltage side current when the low-voltage winding side is short-circuited.
S15: and establishing a third equation by using the second high-voltage side voltage, the second high-voltage side current, the high-voltage side self-leakage inductance to be solved and the low-voltage side self-leakage inductance to be solved.
Specifically, in this embodiment, in order to describe step S15 in detail, fig. 4 is provided in the embodiment of the present invention, and fig. 4 is a schematic diagram of a self-leakage no-load inductance when a low-voltage winding side of a transformer is short-circuited in the embodiment of the present invention; after the low-voltage winding side is short-circuited, applying a second high-voltage side voltage to the high-voltage winding side to correspondingly obtain a second high-voltage side current, wherein a third equation is specifically represented by the following formula:
L k ＝L' 2σ +L 1σ
in the above formula, U k Is the second high side voltage, I k Is the second high side current, L' 2σ To solve for low side self-leakage inductance, L 1σ The self-leakage inductance of the high-voltage side is to be solved.
S16: and simultaneously solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved by a first equation, a second equation and a third equation.
Specifically, as an alternative embodiment of the present invention, step S16 includes:
simultaneously solving a low-voltage side self-leakage inductance to be solved and a high-voltage side self-leakage inductance to be solved by a first equation, a second equation and a third equation to obtain the low-voltage side self-leakage inductance and the high-voltage side self-leakage inductance;
determining an impedance reference value of the transformer;
and respectively calculating the ratio of the low-voltage side self-leakage inductance to the impedance reference value and the ratio of the high-voltage side self-leakage inductance to the impedance reference value, and correspondingly obtaining the per-unit value of the low-voltage side self-leakage inductance and the per-unit value of the high-voltage side self-leakage inductance.
The solved low-voltage side self-leakage inductance and high-voltage side self-leakage inductance can be represented by the following formula:
the parameters in the above formula have the same meanings as those described in the above examples.
The impedance reference value of the transformer can be expressed by the following formula:
wherein, Z B Is an impedance reference value, S N Rated capacity of transformer, U N The rated voltage of the transformer.
The per unit value of the low-side self-leakage inductance and the per unit value of the high-side self-leakage inductance can be calculated by the following formula:
wherein the content of the first and second substances,
is the per unit value of the high side self-leakage inductance,
is the per unit value of the low-voltage side self-leakage inductance.
After obtaining the per unit value of the low-voltage side self-leakage inductance and the per unit value of the high-voltage side self-leakage inductance, as an optional embodiment, the method further includes: and establishing a T-shaped equivalent circuit module of the transformer by using the per-unit value of the low-voltage side self-leakage inductance and the per-unit value of the high-voltage side self-leakage inductance obtained by solving.
The method for calculating the self-leakage inductance of the low-voltage side and the self-leakage inductance of the high-voltage side of the transformer provided by the first embodiment of the invention is applied before an iron core is not installed on the high-voltage winding side and the low-voltage winding side of the transformer, and specifically, the voltage of the high-voltage side and the voltage of the low-voltage side, the corresponding current of the high-voltage side and the current of the low-voltage side, and the current of the second high-voltage side when the low-voltage side is short-circuited are respectively obtained, the first equation of the high-voltage winding side, the second equation of the low-voltage winding side and the third equation when the low-voltage winding side is short-circuited are correspondingly established according to the excitation inductance of the transformer, and finally, three equations are combined to solve the per unit value of the self-leakage inductance of the low-voltage side and the per unit value of the self-leakage inductance of the high-voltage side. By adopting the scheme, before the iron core is not inserted into the winding side of the transformer, the voltage is applied to the high-voltage winding side and the low-voltage winding side, so that the iron core of the transformer is equivalent to a saturated state, the self-leakage inductance of the transformer is calculated under the condition that the iron core of the transformer is equivalent to the saturated state, the difference error between the calculated self-leakage inductance and the actual self-leakage inductance of the transformer is correspondingly reduced, and correspondingly, the difference between the established T-shaped equivalent circuit model of the transformer and the actual performance of the transformer is smaller.
In order to avoid that the calculation accuracy of the self-leakage inductance of the transformer is low due to the fact that the transformer is burnt out due to the fact that an applied voltage value is too high and the self-leakage inductance of the transformer is caused due to the fact that the applied voltage value is too high when the first high-voltage side voltage, the second high-voltage side voltage and the low-voltage side voltage are applied, the invention provides a second embodiment, please refer to fig. 5, and fig. 5 is a flow chart of a self-leakage inductance calculation method for the transformer, which is disclosed by the second embodiment of the invention, wherein the self-leakage inductance calculation method is applied to solve the self-leakage inductance of the low-voltage side and the self-leakage inductance of the high-voltage side of the transformer before an iron core is not mounted on the high-voltage winding side and the low-voltage winding side of the transformer, and the method comprises the following steps:
s10: a first high-side voltage applied at the high-voltage winding side and a corresponding first high-side current are obtained.
S20: judging whether the first high-voltage side current exceeds the high-voltage side rated current or not; if yes, entering S21; if not, the process proceeds to S11.
S21: and carrying out first early warning prompt to enable the target personnel to adjust the first high-voltage side voltage.
S11: and establishing a first equation by using the first high-voltage side voltage, the first high-voltage side current, the excitation inductance and the high-voltage side self-leakage inductance to be solved.
S12: the low-voltage side voltage applied at the low-voltage winding side and the corresponding low-voltage side current are obtained.
S22: and judging whether the low-voltage side current exceeds the low-voltage side rated current, if so, entering S23, and if not, entering S13.
S23: and carrying out second early warning prompt to enable the target personnel to adjust the voltage of the low-voltage side.
S13: and establishing a second equation by using the low-voltage side voltage, the low-voltage side current, the excitation inductance and the low-voltage side self-leakage inductance to be solved.
S14: and when the low-voltage winding side is short-circuited, acquiring a second high-voltage side voltage applied to the high-voltage winding side and a corresponding second high-voltage side current.
S24: and judging whether the second high-voltage side current exceeds the high-voltage side rated current, if so, entering S25, and if not, entering S15.
S25: and carrying out third early warning prompt to enable the target personnel to adjust the voltage of the second high-voltage side.
S15: and establishing a third equation by using the second high-voltage side voltage, the second high-voltage side current, the high-voltage side self-leakage inductance to be solved and the low-voltage side self-leakage inductance to be solved.
S16: and simultaneously solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved by a first equation, a second equation and a third equation.
Specifically, the first warning prompt, the second warning prompt and the third warning prompt can be different prompt modes to distinguish which voltage overload condition is. The first early warning prompt, the second early warning prompt and the third early warning prompt comprise prompt information, and whether the currently applied voltage is too high or too low, so that technicians can conveniently adjust the voltages of the high-voltage winding side and the low-voltage winding side, and the currents corresponding to the high-voltage winding side and the low-voltage winding side can be correspondingly changed.
In the self-leakage inductance calculation method for the transformer provided by the second embodiment of the present invention, before no iron core is installed on the high-voltage winding side and the low-voltage winding side of the transformer, the low-voltage side self-leakage inductance and the high-voltage side self-leakage inductance of the transformer are solved by applying the calculation method, specifically, the first high-voltage side voltage, the low-voltage side voltage, the corresponding first high-voltage side current and low-voltage side current of the high-voltage winding side and the low-voltage winding side, and the second high-voltage side current when the low-voltage side is short-circuited are respectively obtained, the first equation of the high-voltage winding side, the second equation of the low-voltage winding side, and the third equation when the low-voltage winding side is short-circuited are correspondingly established according to the excitation inductance of the transformer, and finally, the three equations are combined to solve the per unit value of the low-voltage side self-leakage inductance and the per unit value of the high-voltage side self-leakage inductance. By adopting the scheme, before the iron core is not inserted into the winding side of the transformer, the voltage is applied to the high-voltage winding side and the low-voltage winding side, so that the iron core of the transformer is equivalent to a saturated state, the self-leakage inductance of the transformer is calculated under the condition that the iron core of the transformer is equivalent to the saturated state, the difference error between the calculated self-leakage inductance and the actual self-leakage inductance of the transformer is correspondingly reduced, and correspondingly, the difference between the established T-shaped equivalent circuit model of the transformer and the actual transformer performance is smaller. And early warning prompt is carried out when the applied voltage value is too high, so that related technical personnel can take corresponding measures in time, and the problem that the calculation precision of the self-leakage inductance of the transformer is low due to the fact that the transformer is burnt and the applied voltage value is too high is solved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a self-leakage inductance calculating device for a transformer according to an embodiment of the present invention, including:
a first obtaining module 601, configured to obtain a first high-voltage-side voltage and a corresponding first high-voltage-side current applied to a high-voltage winding side;
a first establishing module 602, configured to establish a first equation using a first high-voltage-side voltage, a first high-voltage-side current, an excitation inductance, and a high-voltage-side self-leakage inductance to be solved;
a second obtaining module 603, configured to obtain a low-voltage-side voltage applied to the low-voltage winding side and a corresponding low-voltage-side current;
a second establishing module 604, configured to establish a second equation using the low-voltage side voltage, the low-voltage side current, the excitation inductance, and the low-voltage side self leakage inductance to be solved;
a third obtaining module 605, configured to obtain a second high-voltage-side voltage and a corresponding second high-voltage-side current applied to the high-voltage winding side when the low-voltage winding side is short-circuited;
a third establishing module 606, configured to establish a third equation by using the second high-voltage-side voltage, the second high-voltage-side current, the high-voltage-side self-leakage inductance to be solved, and the low-voltage-side self-leakage inductance to be solved;
and the solving module 607 is used for solving the per unit value of the low-voltage side self-leakage inductance and the per unit value of the high-voltage side self-leakage inductance to be solved by simultaneously establishing the first equation, the second equation and the third equation.
The self-leakage inductance calculation device for the transformer provided by this embodiment is to apply the calculation method to solve the self-leakage inductance at the low voltage side and the self-leakage inductance at the high voltage side of the transformer before installing no iron core at the high voltage winding side and the low voltage winding side of the transformer, specifically, obtain the voltage at the high voltage side and the voltage at the low voltage side, the corresponding current at the high voltage side and the low voltage side, and the current at the low voltage side at the second high voltage side when the low voltage side is short-circuited, correspondingly establish the first equation at the high voltage winding side, the second equation at the low voltage winding side, and the third equation when the low voltage winding side is short-circuited according to the excitation inductance of the transformer, and finally combine the three equations to solve the per unit value of the self-leakage inductance at the low voltage side and the per unit value of the self-leakage inductance at the high voltage side. By adopting the scheme, before the iron core is not inserted into the winding side of the transformer, the voltage is applied to the high-voltage winding side and the low-voltage winding side, so that the iron core of the transformer is equivalent to a saturated state, the self-leakage inductance of the transformer is calculated under the condition that the iron core of the transformer is equivalent to the saturated state, the difference error between the calculated self-leakage inductance and the actual self-leakage inductance of the transformer is correspondingly reduced, and correspondingly, the difference between the established T-shaped equivalent circuit model of the transformer and the actual transformer performance is smaller. Correspondingly, the difference between the established T-shaped equivalent circuit model of the transformer and the actual transformer performance is small.
Based on the above embodiment, as an optional embodiment, the method further includes:
and the fourth establishing module is used for establishing a T-shaped equivalent circuit model of the transformer by using the per-unit value of the low-voltage side self-leakage inductance and the per-unit value of the high-voltage side self-leakage inductance obtained by solving.
Based on the above embodiment, as an optional embodiment, the method further includes:
the first judging module is used for judging whether the first high-voltage side current exceeds the high-voltage side rated current or not, if so, the first prompting module is started,
the first prompt module is used for carrying out first early warning prompt so that a target person can adjust the voltage of the first high-voltage side;
the second judgment module is used for judging whether the low-voltage side current exceeds the low-voltage side rated current or not, and if so, the second judgment module enters the second prompt module;
and the second prompt module is used for carrying out second early warning prompt so as to enable the target personnel to adjust the voltage of the low-voltage side.
Based on the above embodiment, as an optional embodiment, the method further includes:
the third judging module is used for judging whether the second high-voltage side current exceeds the high-voltage side rated current or not, and if so, the third judging module enters the third prompting module;
and the third prompt module is used for carrying out third early warning prompt so that the target personnel can adjust the voltage of the second high-voltage side.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a self-leakage-inductance calculating device for a transformer according to an embodiment of the present invention, including:
a memory 701 for storing a computer program;
a processor 702 for executing a computer program stored in a memory to implement the steps of the self leakage inductance calculation method for a transformer mentioned in any of the above embodiments.
Since the self-leakage-inductance calculating device for the transformer provided by this embodiment can call the computer program stored in the memory through the processor to implement the steps of the self-leakage-inductance calculating method for the transformer provided by any of the above embodiments, the self-leakage-inductance calculating device has the same practical effects as the above self-leakage-inductance calculating method for the transformer.
In order to better understand the present solution, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the self-leakage-inductance calculation method for a transformer according to any of the above embodiments.
The computer-readable storage medium provided in this embodiment may have the same practical effects as the self-leakage-inductance calculation method for the transformer described above, because the steps of the self-leakage-inductance calculation method for the transformer provided in any embodiment may be implemented by calling a computer program stored in the computer-readable storage medium through a processor.
In order to further explain the effect of the technical scheme provided by the embodiment of the invention, the embodiment of the invention provides an application scenario, wherein the basic parameters of the transformer in the application scenario refer to table 1, and table 1 is a transformer basic parameter table. The method aims at the basic parameters of the transformer provided by the embodiment of the invention.
TABLE 1 fundamental parameters of transformers
| Capacity of | 20kVA |
| Voltage class | 800V/38.2V |
| Rated current | 14.43A/302.3A |
| Short circuit loss | 409W |
| No load loss | 118W |
Then, after the first high-voltage side voltage and the first low-voltage side voltage are applied according to the embodiment of the invention, the corresponding transformer inductance parameter L is obtained air2 And L air1 . Please refer to table 2, where table 2 is a table of transformer inductance parameter test results.
TABLE 2 Transformer inductance parameter test results
Secondly, the self-leakage inductance of the transformer with the model is solved by applying the technical scheme provided by the embodiment of the invention
And
a transformer T-type circuit simulation model is established in the PSCAD in combination with the parameters in table 1, the solved self-leakage inductance of the transformer is verified, the three-phase current instantaneous value and the zero-mode current pair on the high-voltage winding side of the transformer obtained by the simulation model are shown in fig. 8, fig. 8 is a schematic diagram of a verification curve for verifying the accuracy of the self-leakage inductance provided by the embodiment of the present invention, wherein the dotted line represents actual recording data, and the realization is achievedRepresenting the simulation data obtained by the simulation model, in fig. 8, the dotted line and the solid line substantially coincide, and therefore, the self-leakage inductance calculated by the embodiment of the present invention has high accuracy.
The self-leakage inductance calculation method, device, equipment and storage medium for the transformer provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
Claims (10)
1. A self-leakage inductance calculation method for a transformer is characterized in that the self-leakage inductance calculation method is applied to solve the low-voltage side self-leakage inductance and the high-voltage side self-leakage inductance of the transformer before an iron core is not mounted on the high-voltage winding side and the low-voltage winding side of the transformer, and comprises the following steps:
acquiring a first high-voltage side voltage applied to the high-voltage winding side and a corresponding first high-voltage side current;
establishing a first equation by using the first high-voltage side voltage, the first high-voltage side current, the excitation inductor and the high-voltage side self-leakage inductor to be solved;
acquiring a low-voltage side voltage applied to the low-voltage winding side and a corresponding low-voltage side current;
establishing a second equation by using the low-voltage side voltage, the low-voltage side current, the excitation inductance and the low-voltage side self-leakage inductance to be solved;
when the low-voltage winding side is short-circuited, acquiring a second high-voltage side voltage applied to the high-voltage winding side and a corresponding second high-voltage side current;
establishing a third equation by using the second high-voltage side voltage, the second high-voltage side current, the high-voltage side self-leakage inductance to be solved and the low-voltage side self-leakage inductance to be solved;
and simultaneously solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved by the first equation, the second equation and the third equation.
2. The method according to claim 1, further comprising, after the solving for the per unit value of the low-voltage side self-leakage inductance and the per unit value of the high-voltage side self-leakage inductance, the following steps:
and establishing a T-shaped equivalent circuit model of the transformer by using the per-unit value of the low-voltage side self-leakage inductance and the per-unit value of the high-voltage side self-leakage inductance obtained by solving.
3. The method according to claim 1 or 2, wherein the per unit value of the low-voltage side self-leakage inductance and the per unit value of the high-voltage side self-leakage inductance to be solved are solved by:
simultaneously solving the low-voltage side self-leakage inductance to be solved and the high-voltage side self-leakage inductance to be solved by the first equation, the second equation and the third equation to obtain the low-voltage side self-leakage inductance and the high-voltage side self-leakage inductance;
determining an impedance reference value of the transformer;
and respectively calculating the ratio of the low-voltage side self-leakage inductance to the impedance reference value and the ratio of the high-voltage side self-leakage inductance to the impedance reference value, and correspondingly obtaining a per-unit value of the low-voltage side self-leakage inductance and a per-unit value of the high-voltage side self-leakage inductance.
4. The self-leakage inductance calculation method for the transformer according to claim 1, further comprising, after said obtaining a first high-voltage-side voltage and a corresponding first high-voltage-side current applied at the high-voltage winding side:
judging whether the first high-voltage side current exceeds a high-voltage side rated current, if so, carrying out first early warning prompt to enable a target person to adjust the first high-voltage side voltage;
correspondingly, after the obtaining of the low-voltage side voltage and the corresponding low-voltage side current applied at the low-voltage winding side, the method further comprises the following steps:
and judging whether the low-voltage side current exceeds the low-voltage side rated current, and if so, performing second early warning prompt to enable the target personnel to adjust the low-voltage side voltage.
5. The self-leakage inductance calculation method for the transformer according to claim 4, further comprising, after said obtaining a second high-voltage-side voltage and a corresponding second high-voltage-side current applied at the high-voltage winding side:
and judging whether the second high-voltage side current exceeds the high-voltage side rated current, and if so, performing third early warning prompt to enable the target personnel to adjust the second high-voltage side voltage.
6. A self-leakage inductance calculation device for a transformer, wherein the self-leakage inductance calculation device is applied to solve the self-leakage inductance of the transformer before an iron core is not installed on the high-voltage winding side and the low-voltage winding side of the transformer, and the self-leakage inductance calculation device comprises:
the first acquisition module is used for acquiring a first high-voltage side voltage applied to the high-voltage winding side and a corresponding first high-voltage side current;
the first establishing module is used for establishing a first equation by utilizing the first high-voltage side voltage, the first high-voltage side current, the excitation inductance and the high-voltage side self-leakage inductance to be solved;
the second acquisition module is used for acquiring low-voltage side voltage applied to the low-voltage winding side and corresponding low-voltage side current;
the second establishing module is used for establishing a second equation by using the low-voltage side voltage, the low-voltage side current, the excitation inductor and the low-voltage side self-leakage inductor to be solved;
the third acquisition module is used for acquiring a second high-voltage side voltage and a corresponding second high-voltage side current applied to the high-voltage winding side when the low-voltage winding side is short-circuited;
the third establishing module is used for establishing a third equation by utilizing the second high-voltage side voltage, the second high-voltage side current, the high-voltage side self-leakage inductance to be solved and the low-voltage side self-leakage inductance to be solved;
and the solving module is used for solving the per unit value of the low-voltage side self-leakage inductance to be solved and the per unit value of the high-voltage side self-leakage inductance to be solved by simultaneously establishing the first equation, the second equation and the third equation.
7. The self leakage inductance calculation apparatus for a transformer according to claim 6, further comprising:
and the fourth establishing module is used for establishing the T-shaped equivalent circuit model of the transformer by using the per-unit value of the low-voltage side self-leakage inductance and the per-unit value of the high-voltage side self-leakage inductance obtained by solving.
8. The self-leakage inductance calculation apparatus for a transformer according to claim 6, further comprising:
the first judging module is used for judging whether the first high-voltage side current exceeds the high-voltage side rated current or not, if so, the first prompting module is started,
the first prompt module is used for carrying out first early warning prompt so as to enable target personnel to adjust the first high-voltage side voltage;
the second judgment module is used for judging whether the low-voltage side current exceeds the low-voltage side rated current or not, and if so, the second judgment module enters the second prompt module;
and the second prompt module is used for carrying out second early warning prompt so as to enable target personnel to adjust the voltage of the low-voltage side.
9. A self-leakage inductance calculation device for a transformer, wherein the self-leakage inductance calculation device is applied to solve the self-leakage inductance of the transformer before an iron core is not mounted on both a high-voltage winding side and a low-voltage winding side of the transformer, and the self-leakage inductance calculation device comprises:
a memory for storing a computer program;
a processor for executing a computer program stored in the memory to implement the steps of the method for calculating the self leakage inductance for a transformer according to any one of claims 1 to 5.
10. A computer-readable storage medium, having a computer program stored thereon, the computer program being executable by a processor for implementing the steps of the method for calculating the self-leakage inductance of a transformer according to any one of claims 1 to 5.
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