CN108233374B - Method and system for suppressing impact load harmonic waves of preassembled box transformer substation - Google Patents
Method and system for suppressing impact load harmonic waves of preassembled box transformer substation Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention provides a method and a system for suppressing impact load harmonic waves of a preassembled box transformer, wherein the method comprises the following steps: under the condition that the output voltage and the output power of the preassembled type box transformer substation are stable, acquiring a harmonic current of a first harmonic, an h harmonic current of a second harmonic and an h harmonic current of a third harmonic, and judging whether the h harmonic current of the third harmonic is larger than a first preset value; if the phase angle is larger than the first preset value, calculating the phase angle of the h harmonic current of the third harmonic according to the h harmonic current of the first harmonic, the h harmonic current of the second harmonic and the h harmonic current of the third harmonic; a harmonic modulation function corresponding to the first harmonic current is calculated from the phase angle of the h-th harmonic current of the third harmonic. According to the invention, a harmonic modulation function is accurately formulated according to the actual condition of the preassembled box transformer substation, and a harmonic modulation function and a harmonic modulation mode corresponding to the preassembled box transformer substation are provided for the preassembled box transformer substation.
Description
Technical Field
The invention belongs to the field of impact load harmonic suppression, and particularly relates to a method and a system for suppressing impact load harmonic of a preassembled box transformer substation.
Background
With the continuous expansion of the scale of the power system, the high-power converter, the silicon controlled rectifier control device and various high-power nonlinear loads are increasingly widely applied, and household appliances are popularized, so that the harmonic pollution of the power system is increasingly serious, a large amount of harmonic waves and reactive current are injected into a power grid, and the power quality is reduced. The harmonic wave not only increases the loss of the power equipment, but also causes the misoperation of relay protection and automation devices, electric resonance and mechanical vibration of a motor, and the communication line is interfered, so that the precision of a measuring instrument is influenced, even a large accident of a power grid is caused, the safety and economic operation of a power system are greatly influenced, one of the main public hazards of the power system is realized, and the three public hazards in the power system are parallel to the electromagnetic interference and the power factor reduction. The harmonic content in the power system is monitored in real time, the harmonic condition in the power system is accurately mastered, and harmonic suppression is carried out, so that the safety operation of the power system is necessary for preventing harmonic hazard.
In the prior art, there is no device in the power system that suppresses the impact load harmonics.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: there is no device for suppressing the impact load harmonic wave in the electric power system in the prior art.
In order to solve the technical problems, the invention provides a method for suppressing impact load harmonic waves of a preassembled box transformer, which comprises the following steps:
under the condition that the output voltage and the output power of the preassembled type box transformer substation are stable, acquiring an h harmonic current of a first impact load harmonic, an h harmonic current of a second impact load harmonic and an h harmonic current of a third impact load harmonic output by the preassembled type box transformer substation, wherein the third impact load harmonic is obtained by tuning the first impact load harmonic by the second impact load harmonic; judging whether the h harmonic current of the third impact load harmonic is larger than a first preset value or not; if the phase angle of the h harmonic current of the third impact load harmonic is larger than the first preset value, calculating the phase angle of the h harmonic current of the third impact load harmonic according to the h harmonic current of the first impact load harmonic, the h harmonic current of the second impact load harmonic and the h harmonic current of the third impact load harmonic; calculating a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic; controlling the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function; the h+1th harmonic current of the first shock load harmonic is tuned by the h+1th harmonic current of the second shock load harmonic.
The invention has the beneficial effects that: under the conditions of voltage stabilization and power stabilization, the phase angle of the harmonic current related to the preassembled box transformer substation is calculated by acquiring the harmonic current parameter related to the preassembled box transformer substation, and the harmonic modulation function related to the preassembled box transformer substation is corrected according to the phase angle, so that the harmonic modulation function is accurately formulated according to the actual condition of the preassembled box transformer substation, the harmonic modulation function and the harmonic modulation mode corresponding to the preassembled box transformer substation are provided for the preassembled box transformer substation, the problem that the harmonic modulation of the preassembled box transformer substation is inaccurate due to the unification of the harmonic modulation function is solved, and the harmonic modulation function adapting to the preassembled box transformer substation is provided for the preassembled box transformer substation. In addition, along with the continuous change of relevant parameters of the preassembled type box transformer, the second impact load harmonic current controlled by the harmonic suppression function also changes continuously correspondingly, namely, when the first impact load harmonic current is large, the second impact load harmonic current is also large correspondingly, so that the second impact load harmonic current can quickly suppress and weaken the first impact load harmonic current, the suppression efficiency of impact load harmonic in the preassembled type box transformer is improved, the impact load harmonic is tuned in time, the reliability of the preassembled type box transformer is improved, the impact load harmonic is prevented from damaging a power system, and the property loss of a user is reduced.
Further, the formula for calculating the phase angle of the h harmonic current of the third impact load harmonic is as follows:
wherein θ h A phase angle of an h-th harmonic current that is the third impact load harmonic; i h An h-th harmonic current that is a third impact load harmonic;an h-th harmonic current that is a first impact load harmonic; />An h-th harmonic current that is a second impact load harmonic.
The above-mentioned further beneficial effect: under the condition that the output voltage and the output power of the preassembled type box transformer substation are stable, only harmonic current in the preassembled type box transformer substation is used as a variable, the phase angle of the harmonic current related to the preassembled type box transformer substation is calculated according to related harmonic current parameters in the preassembled type box transformer substation, the phase angle is calculated according to the actual condition of the preassembled type box transformer substation, the accuracy of the adjustment of the preassembled type box transformer substation harmonic is improved, the tuning requirement of the preassembled type box transformer substation is accurately calculated according to the self condition of the preassembled type box transformer substation, the calculation of a harmonic modulation function according to the phase angle is facilitated, and whether the preassembled type box transformer substation is in a normal working condition and in a normal state or not is conveniently judged according to the phase angle.
Further, the formula for calculating the harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic is:
f(θ)＝0.9[sin(θ h )+0.25sin(3θ h )]，
wherein f (θ) is a harmonic modulation function; θ h The phase angle of the h-th harmonic current, which is the third impact load harmonic.
The above-mentioned further beneficial effect: according to the phase angle correction harmonic modulation function related to the preassembled box transformer, the harmonic modulation function related to the preassembled box transformer is calculated, so that the harmonic modulation function accords with the actual tuning requirement of the harmonic current of the preassembled box transformer, the harmonic modulation function controls the generation and adjustment of the second impact load harmonic current, and the problem that the harmonic modulation function cannot blindly adjust the harmonic current according to the actual requirement of the preassembled box transformer is solved.
Further, the formula for controlling the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function is:
wherein,an h+1th harmonic current that is a second impact load harmonic; />An h-th harmonic current that is a first impact load harmonic; f (θ) is a harmonic modulation function.
The above-mentioned further beneficial effect: according to the harmonic modulation function related to the preassembled box transformer substation, the second impact load harmonic current related to the preassembled box transformer substation is calculated, the second impact load harmonic current is accurately output according to the actual tuning requirement of the preassembled box transformer substation, the suppression efficiency of impact load harmonic in the preassembled box transformer substation is improved, the impact load harmonic is tuned in time, the reliability of the preassembled box transformer substation is improved, the impact load harmonic is prevented from damaging an electric power system, and the property loss of users is reduced.
Further, the standard input voltage of the preassembled type box transformer substation is 10KV, and the value range of the first preset value is 3A-26A.
The above-mentioned further beneficial effect: and comparing the actual third impact load harmonic current output by the preassembled type box transformer substation with a first preset standard value, wherein the first preset standard value is the allowable value of the harmonic current, and only when the actual third impact load harmonic current value output by the preassembled type box transformer substation is larger than the first preset standard value, the preassembled type box transformer substation has tuning requirements, the tuning condition of the preassembled type box transformer substation is accurately judged, and the tuning precision of the preassembled type box transformer substation is improved.
The invention also provides a suppression system for impact load harmonic waves of the preassembled type box transformer substation, which comprises: the device comprises a preassembled box transformer and a suppression device, wherein the suppression device is arranged inside the preassembled box transformer, the input end of the suppression device is connected with the output end of a transformer in the preassembled box transformer, the output end of the suppression device is connected with the low-voltage input end in the preassembled box transformer, the suppression device comprises an acquisition device and a processing device,
the acquisition device is used for acquiring an h harmonic current of a first impact load harmonic, an h harmonic current of a second impact load harmonic and an h harmonic current of a third impact load harmonic output by the preassembled box transformer, wherein the third impact load harmonic is obtained by tuning the first impact load harmonic by the second impact load harmonic;
the processing equipment is used for judging whether the h harmonic current of the third impact load harmonic is larger than a first preset value or not;
the processing device is further configured to calculate a phase angle of the h-th harmonic current of the third impact load harmonic according to the h-th harmonic current of the first impact load harmonic, the h-th harmonic current of the second impact load harmonic, and the h-th harmonic current of the third impact load harmonic when the h-th harmonic current of the third impact load harmonic is greater than a first preset value;
the processing equipment is also used for calculating a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic;
the processing equipment is also used for controlling and outputting the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function;
the processing device is further configured to tune the h+1 th harmonic current of the first impact load harmonic by the h+1 th harmonic current of the second impact load harmonic.
The invention has the beneficial effects that: under the conditions of voltage stabilization and power stabilization, the phase angle of the harmonic current related to the preassembled box transformer substation is calculated by acquiring the harmonic current parameter related to the preassembled box transformer substation, and the harmonic modulation function related to the preassembled box transformer substation is corrected according to the phase angle, so that the harmonic modulation function is accurately formulated according to the actual condition of the preassembled box transformer substation, the harmonic modulation function and the harmonic modulation mode corresponding to the preassembled box transformer substation are provided for the preassembled box transformer substation, the problem that the harmonic modulation of the preassembled box transformer substation is inaccurate due to the unification of the harmonic modulation function is solved, and the harmonic modulation function adapting to the preassembled box transformer substation is provided for the preassembled box transformer substation. In addition, along with the continuous change of relevant parameters of the preassembled type box transformer, the second impact load harmonic current controlled by the harmonic suppression function also changes continuously correspondingly, namely, when the first impact load harmonic current is large, the second impact load harmonic current is also large correspondingly, so that the second impact load harmonic current can quickly suppress and weaken the first impact load harmonic current, the suppression efficiency of impact load harmonic in the preassembled type box transformer is improved, the impact load harmonic is tuned in time, the reliability of the preassembled type box transformer is improved, the impact load harmonic is prevented from damaging a power system, and the property loss of a user is reduced.
Further, the processing device is specifically configured to calculate a phase angle of the h-th harmonic current of the third impact load harmonic according to the formula:
wherein θ h A phase angle of an h-th harmonic current that is the third impact load harmonic; i h An h-th harmonic current that is a third impact load harmonic;an h-th harmonic current that is a first impact load harmonic; />An h-th harmonic current that is a second impact load harmonic.
The above-mentioned further beneficial effect: under the condition that the output voltage and the output power of the preassembled type box transformer substation are stable, only harmonic current in the preassembled type box transformer substation is used as a variable, the phase angle of the harmonic current related to the preassembled type box transformer substation is calculated according to related harmonic current parameters in the preassembled type box transformer substation, the phase angle is calculated according to the actual condition of the preassembled type box transformer substation, the accuracy of the adjustment of the preassembled type box transformer substation harmonic is improved, the tuning requirement of the preassembled type box transformer substation is accurately calculated according to the self condition of the preassembled type box transformer substation, the calculation of a harmonic modulation function according to the phase angle is facilitated, and whether the preassembled type box transformer substation is in a normal working condition and in a normal state or not is conveniently judged according to the phase angle.
Further, the processing device is specifically configured to calculate, according to the phase angle of the h harmonic current of the third impact load harmonic, a formula of a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic, where:
f(θ)＝0.9[sin(θ h )+0.25sin(3θ h )]，
wherein f (θ) is a harmonic modulation function; θ h The phase angle of the h-th harmonic current, which is the third impact load harmonic.
The above-mentioned further beneficial effect: according to the phase angle correction harmonic modulation function related to the preassembled box transformer, the harmonic modulation function related to the preassembled box transformer is calculated, so that the harmonic modulation function accords with the actual tuning requirement of the harmonic current of the preassembled box transformer, the harmonic modulation function controls the generation and adjustment of the second impact load harmonic current, and the problem that the harmonic modulation function cannot blindly adjust the harmonic current according to the actual requirement of the preassembled box transformer is solved.
Further, the processing device is specifically configured to control the h+1th harmonic current of the output second impact load harmonic according to the harmonic modulation function according to the formula:
wherein,an h+1th harmonic current that is a second impact load harmonic; />An h-th harmonic current that is a first impact load harmonic; f (θ) is a harmonic modulation function.
The above-mentioned further beneficial effect: according to the harmonic modulation function related to the preassembled box transformer substation, the second impact load harmonic current related to the preassembled box transformer substation is calculated, the second impact load harmonic current is accurately output according to the actual tuning requirement of the preassembled box transformer substation, the suppression efficiency of impact load harmonic in the preassembled box transformer substation is improved, the impact load harmonic is tuned in time, the reliability of the preassembled box transformer substation is improved, the impact load harmonic is prevented from damaging an electric power system, and the property loss of users is reduced.
Further, the standard input voltage of the preassembled type box transformer substation is 10KV, and the value range of the first preset value is 3A-26A.
The above-mentioned further beneficial effect: and comparing the actual third impact load harmonic current output by the preassembled type box transformer substation with a first preset standard value, wherein the first preset standard value is the allowable value of the harmonic current, and only when the actual third impact load harmonic current value output by the preassembled type box transformer substation is larger than the first preset standard value, the preassembled type box transformer substation has tuning requirements, the tuning condition of the preassembled type box transformer substation is accurately judged, and the tuning precision of the preassembled type box transformer substation is improved.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
As shown in fig. 1, fig. 1 is a flow chart of an embodiment of the present invention. The embodiment of the invention provides a method for inhibiting impact load harmonic waves of a preassembled box transformer, which comprises the following steps:
s11, under the condition that the output voltage and the output power of the preassembled box transformer substation are stable, acquiring an h harmonic current of a first impact load harmonic, an h harmonic current of a second impact load harmonic and an h harmonic current of a third impact load harmonic output by the preassembled box transformer substation, wherein the third impact load harmonic is obtained by tuning the first impact load harmonic by the second impact load harmonic;
s12, judging whether the h harmonic current of the third impact load harmonic is larger than a first preset value or not;
s13, if the phase angle of the h harmonic current of the third impact load harmonic is larger than the first preset value, calculating the phase angle of the h harmonic current of the third impact load harmonic according to the h harmonic current of the first impact load harmonic, the h harmonic current of the second impact load harmonic and the h harmonic current of the third impact load harmonic;
s14, calculating a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic;
s15, controlling the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function;
s16, tuning the h+1th harmonic current of the first impact load harmonic through the h+1th harmonic current of the second impact load harmonic. Wherein the value range of h is 2-19 times.
According to the suppression method for the impulse load harmonic waves of the preassembled type box transformer substation, the suppression device is used for suppressing the impulse load harmonic waves of the preassembled type box transformer substation, meanwhile, in the suppression process, the h-th harmonic current of the first impulse load harmonic waves, the h-th harmonic current of the second impulse load harmonic waves and the h-th harmonic current of the third impulse load harmonic waves output by the preassembled type box transformer substation are obtained, namely, the suppression situation of suppressing the impulse load harmonic waves of the preassembled type box transformer substation is obtained, then, according to the suppression situation, for example, the change of the phase angle of the h-th harmonic current of the third impulse load harmonic waves, the harmonic modulation function in the suppression device is timely adjusted, so that the h+1-th harmonic current of the second impulse load harmonic waves is output by the suppression device through the harmonic modulation function control device, and the h+1-th harmonic current of the second impulse load harmonic waves is further tuned. The embodiment of the invention utilizes the inhibition effect of the inhibition device, and simultaneously feeds back the inhibition condition to the inhibition device to form a closed-loop reverse feedback process.
In the ideal case, the voltage waveform should be a periodic standard sine wave, but since the power system has a large number of power supply devices with nonlinear impedance characteristics together, these devices inject harmonic currents into the utility grid or generate harmonic voltages in the utility grid, which become harmonic sources. The harmonic source deflects the actual voltage waveform from a sine wave, a phenomenon known as voltage sine waveform distortion. Typically characterized by harmonics. The degree of voltage waveform distortion is measured by the voltage sine wave distortion rate, also known as the voltage harmonic distortion rate.
The harmonic wave generated by the power transformer causes the power transformer to generate heat for two reasons, namely, the harmonic current can increase the copper loss and the magnetic leakage loss of the transformer; and secondly, the harmonic voltage can increase the iron loss. The degree of heating of the transformer directly influences the degree of reduction of the use capacity of the transformer.
Under the conditions of voltage stabilization and power stabilization, the phase angle of the harmonic current related to the preassembled box transformer substation is calculated by acquiring the harmonic current parameter related to the preassembled box transformer substation, and the harmonic modulation function related to the preassembled box transformer substation is corrected according to the phase angle, so that the harmonic modulation function is accurately formulated according to the actual condition of the preassembled box transformer substation, the harmonic modulation function and the harmonic modulation mode corresponding to the preassembled box transformer substation are provided for the preassembled box transformer substation, the problem that the harmonic modulation of the preassembled box transformer substation is inaccurate due to the unification of the harmonic modulation function is solved, and the harmonic modulation function adapting to the preassembled box transformer substation is provided for the preassembled box transformer substation. In addition, along with the continuous change of relevant parameters of the preassembled type box transformer, the second impact load harmonic current controlled by the harmonic suppression function also changes continuously correspondingly, namely, when the first impact load harmonic current is large, the second impact load harmonic current is also large correspondingly, so that the second impact load harmonic current can quickly suppress and weaken the first impact load harmonic current, the suppression efficiency of impact load harmonic in the preassembled type box transformer is improved, the impact load harmonic is tuned in time, the reliability of the preassembled type box transformer is improved, the impact load harmonic is prevented from damaging a power system, and the property loss of a user is reduced.
Example 2
Based on embodiment 1, the equation for calculating the phase angle of the h-th harmonic current of the third impact load harmonic in this embodiment is:
wherein θ h A phase angle of an h-th harmonic current that is the third impact load harmonic; i h An h-th harmonic current that is a third impact load harmonic;an h-th harmonic current that is a first impact load harmonic; />An h-th harmonic current that is a second impact load harmonic.
Under the condition that the output voltage and the output power of the preassembled type box transformer substation are stable, only harmonic current in the preassembled type box transformer substation is used as a variable, the phase angle of the harmonic current related to the preassembled type box transformer substation is calculated according to related harmonic current parameters in the preassembled type box transformer substation, the phase angle is calculated according to the actual condition of the preassembled type box transformer substation, the accuracy of the adjustment of the preassembled type box transformer substation harmonic is improved, the tuning requirement of the preassembled type box transformer substation is accurately calculated according to the self condition of the preassembled type box transformer substation, the calculation of a harmonic modulation function according to the phase angle is facilitated, and whether the preassembled type box transformer substation is in a normal working condition and in a normal state or not is conveniently judged according to the phase angle.
Example 3
Based on embodiment 1, in this embodiment, the formula for calculating the harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic is:
f(θ)＝0.9[sin(θ h )+0.25sin(3θ h )]，
wherein f (θ) is a harmonic modulation function; θ h The phase angle of the h-th harmonic current, which is the third impact load harmonic.
The tuning principle of the embodiment of the invention is that zero sequence harmonic wave with a certain proportion is overlapped in sinusoidal modulation wave, namely, the harmonic wave of triple frequency harmonic wave is injected into a preassembled box transformer system, so that the modulation wave presents a saddle shape, the amplitude of the modulation wave is reduced, the utilization ratio of current and voltage is increased, and meanwhile, the suppression method has good harmonic suppression characteristic.
A certain zero sequence harmonic is injected into the sine function, and it can be assumed that θ=ωt, and the modulation function can be expressed as:
f(ωt)＝M[sin(ωt)+k sin(3ωt)]，
wherein f (ωt) is a harmonic modulation function; m is a modulation function, k is a coefficient of injection third harmonic, k can be 0.25, ω is a phase of an h harmonic current of the third impact load harmonic, and t is a fluctuation time interval of the h harmonic current of the third impact load harmonic.
The h+1th harmonic current of the second impact load harmonic can be controlled by f (ωt).
According to the phase angle correction harmonic modulation function related to the preassembled box transformer, the harmonic modulation function related to the preassembled box transformer is calculated, so that the harmonic modulation function accords with the actual tuning requirement of the harmonic current of the preassembled box transformer, the harmonic modulation function controls the generation and adjustment of the second impact load harmonic current, and the problem that the harmonic modulation function cannot blindly adjust the harmonic current according to the actual requirement of the preassembled box transformer is solved.
Example 4
On the basis of any one of embodiment 1, embodiment 2 and embodiment 3, the formula for controlling the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function in this embodiment is as follows:
wherein,an h+1th harmonic current that is a second impact load harmonic; />An h-th harmonic current that is a first impact load harmonic; f (θ) is a harmonic modulation function.
According to the harmonic modulation function related to the preassembled box transformer substation, the second impact load harmonic current related to the preassembled box transformer substation is calculated, the second impact load harmonic current is accurately output according to the actual tuning requirement of the preassembled box transformer substation, the suppression efficiency of impact load harmonic in the preassembled box transformer substation is improved, the impact load harmonic is tuned in time, the reliability of the preassembled box transformer substation is improved, the impact load harmonic is prevented from damaging an electric power system, and the property loss of users is reduced.
Example 5
Based on any one of the embodiment 1, the embodiment 2 and the embodiment 3, in this embodiment, the standard input voltage of the preassembled tank transformer is 10KV, and the value range of the first preset value is 3A-26A.
And comparing the actual third impact load harmonic current output by the preassembled type box transformer substation with a first preset standard value, wherein the first preset standard value is the allowable value of the harmonic current, and only when the actual third impact load harmonic current value output by the preassembled type box transformer substation is larger than the first preset standard value, the preassembled type box transformer substation has tuning requirements, the tuning condition of the preassembled type box transformer substation is accurately judged, and the tuning precision of the preassembled type box transformer substation is improved.
Example 6
As shown in fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the present invention. On the basis of any one of the foregoing embodiments, the present embodiment provides a suppression system for impact load harmonics of a preassembled tank transformer, including: the device comprises a preassembled box transformer and a suppression device, wherein the suppression device is arranged inside the preassembled box transformer, the input end of the suppression device is connected with the output end of a transformer in the preassembled box transformer, the output end of the suppression device is connected with the low-voltage input end in the preassembled box transformer, the suppression device comprises an acquisition device and a processing device,
in the case of a stable output voltage and output power of the preloaded tank transformer,
the acquisition device is used for acquiring an h harmonic current of a first impact load harmonic input by the preassembled box transformer, an h harmonic current of a second impact load harmonic output by the suppression device and an h harmonic current of a third impact load harmonic output by the preassembled box transformer, wherein the third impact load harmonic is obtained by tuning the first impact load harmonic by the second impact load harmonic;
the processing equipment is used for judging whether the h harmonic current of the third impact load harmonic is larger than a first preset value or not;
the processing device is further configured to calculate a phase angle of the h-th harmonic current of the third impact load harmonic according to the h-th harmonic current of the first impact load harmonic, the h-th harmonic current of the second impact load harmonic, and the h-th harmonic current of the third impact load harmonic when the h-th harmonic current of the third impact load harmonic is greater than a first preset value;
the processing equipment is also used for calculating a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic;
the processing equipment is also used for controlling and outputting the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function;
the processing device is further configured to tune the h+1 th harmonic current of the first impact load harmonic by the h+1 th harmonic current of the second impact load harmonic. Wherein the suppression device may be provided at a tank transformer terminal.
Under the conditions of voltage stabilization and power stabilization, the phase angle of the harmonic current related to the preassembled box transformer substation is calculated by acquiring the harmonic current parameter related to the preassembled box transformer substation, and the harmonic modulation function related to the preassembled box transformer substation is corrected according to the phase angle, so that the harmonic modulation function is accurately formulated according to the actual condition of the preassembled box transformer substation, the harmonic modulation function and the harmonic modulation mode corresponding to the preassembled box transformer substation are provided for the preassembled box transformer substation, the problem that the harmonic modulation of the preassembled box transformer substation is inaccurate due to the unification of the harmonic modulation function is solved, and the harmonic modulation function adapting to the preassembled box transformer substation is provided for the preassembled box transformer substation. In addition, along with the continuous change of relevant parameters of the preassembled type box transformer, the second impact load harmonic current controlled by the harmonic suppression function also changes continuously correspondingly, namely, when the first impact load harmonic current is large, the second impact load harmonic current is also large correspondingly, so that the second impact load harmonic current can quickly suppress and weaken the first impact load harmonic current, the suppression efficiency of impact load harmonic in the preassembled type box transformer is improved, the impact load harmonic is tuned in time, the reliability of the preassembled type box transformer is improved, the impact load harmonic is prevented from damaging a power system, and the property loss of a user is reduced.
Example 7
On the basis of embodiment 6, the processing device in this embodiment is specifically configured to calculate a phase angle of the h-th harmonic current of the third impact load harmonic according to the formula:
wherein θ h A phase angle of an h-th harmonic current that is the third impact load harmonic; i h An h-th harmonic current that is a third impact load harmonic;is the firstAn h harmonic current of the impact load harmonic; />An h-th harmonic current that is a second impact load harmonic.
Under the condition that the output voltage and the output power of the preassembled type box transformer substation are stable, only harmonic current in the preassembled type box transformer substation is used as a variable, the phase angle of the harmonic current related to the preassembled type box transformer substation is calculated according to related harmonic current parameters in the preassembled type box transformer substation, the phase angle is calculated according to the actual condition of the preassembled type box transformer substation, the accuracy of the adjustment of the preassembled type box transformer substation harmonic is improved, the tuning requirement of the preassembled type box transformer substation is accurately calculated according to the self condition of the preassembled type box transformer substation, the calculation of a harmonic modulation function according to the phase angle is facilitated, and whether the preassembled type box transformer substation is in a normal working condition and in a normal state or not is conveniently judged according to the phase angle.
Example 8
On the basis of embodiment 6, the formula for calculating the harmonic modulation function corresponding to the h-th harmonic current of the first impact load harmonic according to the phase angle of the h-th harmonic current of the third impact load harmonic is specifically:
f(θ)＝0.9[sin(θ h )+0.25sin(3θ h )]，
wherein f (θ) is a harmonic modulation function; θ h The phase angle of the h-th harmonic current, which is the third impact load harmonic.
According to the phase angle correction harmonic modulation function related to the preassembled box transformer, the harmonic modulation function related to the preassembled box transformer is calculated, so that the harmonic modulation function accords with the actual tuning requirement of the harmonic current of the preassembled box transformer, the harmonic modulation function controls the generation and adjustment of the second impact load harmonic current, and the problem that the harmonic modulation function cannot blindly adjust the harmonic current according to the actual requirement of the preassembled box transformer is solved.
Example 9
On the basis of any one of embodiments 6, 7 and 8, the processing device in this embodiment, specifically, the formula for controlling the h+1th harmonic current for outputting the second impact load harmonic according to the harmonic modulation function is:
wherein,an h+1th harmonic current that is a second impact load harmonic; />An h-th harmonic current that is a first impact load harmonic; f (θ) is a harmonic modulation function.
According to the harmonic modulation function related to the preassembled box transformer substation, the second impact load harmonic current related to the preassembled box transformer substation is calculated, the second impact load harmonic current is accurately output according to the actual tuning requirement of the preassembled box transformer substation, the suppression efficiency of impact load harmonic in the preassembled box transformer substation is improved, the impact load harmonic is tuned in time, the reliability of the preassembled box transformer substation is improved, the impact load harmonic is prevented from damaging an electric power system, and the property loss of users is reduced.
Example 10
Based on any one of the embodiment 6, the embodiment 7 and the embodiment 8, in this embodiment, the standard input voltage of the preassembled tank transformer is 10KV, and the value range of the first preset value is 3A-26A.
The above-mentioned further beneficial effect: and comparing the actual third impact load harmonic current output by the preassembled type box transformer substation with a first preset standard value, wherein the first preset standard value is the allowable value of the harmonic current, and only when the actual third impact load harmonic current value output by the preassembled type box transformer substation is larger than the first preset standard value, the preassembled type box transformer substation has tuning requirements, the tuning condition of the preassembled type box transformer substation is accurately judged, and the tuning precision of the preassembled type box transformer substation is improved.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," 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 invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. 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.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and units described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present invention.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (6)
1. A method for suppressing impact load harmonics of a preassembled tank transformer, the method comprising:
in the case of a stable output voltage and output power of the preloaded tank transformer,
acquiring an h-th harmonic current of a first impact load harmonic, an h-th harmonic current of a second impact load harmonic and an h-th harmonic current of a third impact load harmonic output by the preassembled box transformer, wherein the third impact load harmonic is obtained by tuning the first impact load harmonic by the second impact load harmonic;
judging whether the h harmonic current of the third impact load harmonic is larger than a first preset value or not;
if the phase angle of the h harmonic current of the third impact load harmonic is larger than the first preset value, calculating the phase angle of the h harmonic current of the third impact load harmonic according to the h harmonic current of the first impact load harmonic, the h harmonic current of the second impact load harmonic and the h harmonic current of the third impact load harmonic;
calculating a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic;
controlling the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function;
tuning the h+1th harmonic current of the first impact load harmonic by the h+1th harmonic current of the second impact load harmonic;
the formula for calculating the harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic is as follows:
f(θ)＝0.9[sin(θ h )+0.25sin(3θ h )]，
wherein f (θ) is a harmonic modulation function; θ h A phase angle of an h-th harmonic current that is a third impact load harmonic;
the formula for controlling the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function is as follows:
wherein,an h+1th harmonic current that is a second impact load harmonic; />An h-th harmonic current that is a first impact load harmonic; f (θ) is a harmonic modulation function.
2. The suppression method according to claim 1, wherein the formula for calculating the phase angle of the h-th harmonic current of the third impact load harmonic is:
wherein θ h A phase angle of an h-th harmonic current that is the third impact load harmonic; i h An h-th harmonic current that is a third impact load harmonic;an h-th harmonic current that is a first impact load harmonic; />An h-th harmonic current that is a second impact load harmonic.
3. The method of any one of claims 1-2, wherein the standard input voltage of the pre-load tank transformer is 10KV, and the first preset value is in a range of 3A-26A.
4. A suppression system for impact load harmonics of a preloaded tank transformer, the suppression system comprising: the device comprises a preassembled box transformer and a suppression device, wherein the suppression device is arranged inside the preassembled box transformer, the input end of the suppression device is connected with the output end of a transformer in the preassembled box transformer, the output end of the suppression device is connected with the low-voltage input end in the preassembled box transformer, the suppression device comprises an acquisition device and a processing device,
the acquisition device is used for acquiring an h harmonic current of a first impact load harmonic, an h harmonic current of a second impact load harmonic and an h harmonic current of a third impact load harmonic output by the preassembled box transformer under the condition that the output voltage and the output power of the preassembled box transformer are stable, wherein the third impact load harmonic is obtained by tuning the first impact load harmonic by the second impact load harmonic;
the processing equipment is used for judging whether the h harmonic current of the third impact load harmonic is larger than a first preset value or not;
the processing device is further configured to calculate a phase angle of the h-th harmonic current of the third impact load harmonic according to the h-th harmonic current of the first impact load harmonic, the h-th harmonic current of the second impact load harmonic, and the h-th harmonic current of the third impact load harmonic when the h-th harmonic current of the third impact load harmonic is greater than a first preset value;
the processing equipment is also used for calculating a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic according to the phase angle of the h harmonic current of the third impact load harmonic;
the processing equipment is also used for controlling and outputting the h+1th harmonic current of the second impact load harmonic according to the harmonic modulation function;
processing means for tuning the h+1th harmonic current of the first impact load harmonic by the h+1th harmonic current of the second impact load harmonic;
the processing device is specifically configured to calculate, according to the phase angle of the h harmonic current of the third impact load harmonic, a formula of a harmonic modulation function corresponding to the h harmonic current of the first impact load harmonic, where the formula is:
f(θ)＝0.9[sin(θ h )+0.25sin(3θ h )]，
wherein f (θ) is a harmonic modulation function；θ h A phase angle of an h-th harmonic current that is a third impact load harmonic;
the formula of the h+1th harmonic current for controlling and outputting the second impact load harmonic according to the harmonic modulation function is as follows:
wherein,an h+1th harmonic current that is a second impact load harmonic; />An h-th harmonic current that is a first impact load harmonic; f (θ) is a harmonic modulation function.
5. The suppression system according to claim 4, wherein the processing device is configured to calculate the phase angle of the h-th harmonic current of the third impact load harmonic by:
wherein θ h A phase angle of an h-th harmonic current that is the third impact load harmonic; i h An h-th harmonic current that is a third impact load harmonic;an h-th harmonic current that is a first impact load harmonic; />An h-th harmonic current that is a second impact load harmonic.
6. The suppression system of any one of claims 4-5, wherein the standard input voltage of the pre-load tank transformer is 10KV and the first predetermined value is in the range of 3A-26A.
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