CN112290555A - Automatic voltage control method, system and device - Google Patents
Automatic voltage control method, system and device Download PDFInfo
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- CN112290555A CN112290555A CN202011110577.XA CN202011110577A CN112290555A CN 112290555 A CN112290555 A CN 112290555A CN 202011110577 A CN202011110577 A CN 202011110577A CN 112290555 A CN112290555 A CN 112290555A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Automation & Control Theory (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses an automatic voltage control method, a system and a device, wherein the scheme is used for sampling a voltage signal of a high-voltage side bus, when the frequency deviation of the frequency of the sampled voltage signal and the set frequency is greater than the first preset frequency deviation, the signal is filtered, when the absolute value of the difference value of the filtered voltage signal and the reference value of the preset voltage signal is not less than the voltage difference threshold value, a first control signal is generated, the excitation voltage is adjusted based on the first control signal, and closed-loop adjustment is carried out until the absolute value of the difference value of the effective value of the filtered voltage signal and the reference value of the preset voltage signal is less than the voltage difference threshold value. When the voltage of the high-voltage side bus is adjusted, the frequency deviation between the frequency in the voltage of the high-voltage side bus and the set frequency is greater than the voltage signal filtering of the preset frequency deviation, and the influence on active power when the voltage of the high-voltage side bus is subjected to reactive power adjustment is reduced.
Description
Technical Field
The present invention relates to the field of voltage regulation, and in particular, to an automatic voltage control method, system and apparatus.
Background
In the prior art, when a high-voltage side bus in an alternating current power grid has low-frequency (having a deviation of 0.1Hz to 2.5Hz relative to a 50Hz power frequency) or subsynchronous (having a deviation of 10Hz to 40Hz relative to a 50Hz frequency) voltage oscillation, an excitation voltage of a generator of which an output end is connected with a step-up transformer is usually adjusted directly based on the voltage of the high-voltage side bus, and then the output voltage of the generator is adjusted, and finally reactive power adjustment of the high-voltage side bus is realized.
Disclosure of Invention
The invention aims to provide an automatic voltage control method, system and device, which can filter voltage signals of which the frequency deviation between the frequency in the voltage of a high-voltage side bus and the set frequency is greater than the preset frequency deviation when the voltage of the high-voltage side bus is regulated, and reduce the influence on active power when the voltage of the high-voltage side bus is subjected to reactive regulation.
In order to solve the above technical problem, the present invention provides an automatic voltage control method, including:
sampling a voltage signal of a high-voltage side bus to obtain a sampled voltage signal;
when the frequency deviation of the frequency and the set frequency in the sampling voltage signal is larger than a first preset frequency deviation, filtering the signal to obtain a filtered voltage signal;
judging whether the absolute value of the difference value between the effective value of the filtered voltage signal and a preset voltage signal reference value is smaller than a voltage difference value threshold value or not;
if not, generating a first control signal based on the absolute value of the difference value between the effective value of the filtered voltage signal and the preset voltage signal reference value, and performing closed-loop regulation on the excitation voltage of the generator based on the first control signal until the absolute value of the difference value between the effective value of the filtered voltage signal and the preset voltage signal reference value is smaller than the voltage difference threshold value.
Preferably, generating the first control signal based on an absolute value of a difference between the effective value of the filtered voltage signal and the preset voltage signal reference value comprises:
subtracting the effective value of the filtered voltage signal from the preset voltage signal reference value and taking an absolute value to obtain a voltage increment signal;
and multiplying the voltage increment signal by a time constant K, and performing delay amplification processing on a result obtained by the multiplication to be output as the first control signal.
Preferably, before the closed-loop adjustment of the excitation voltage of the generator based on the first control signal, the method further includes:
sampling a current signal of a high-voltage side bus to obtain a sampled current signal;
generating a high-voltage side reactive signal based on the sampling current signal and the sampling voltage signal;
filtering a signal of which the frequency deviation between the frequency in the high-voltage side reactive signal and the set frequency is greater than a second preset frequency deviation to obtain a filtered reactive signal;
judging whether the absolute value of the difference value between the filtered reactive signal and a preset reactive signal reference value is smaller than a reactive signal difference value threshold value or not;
if not, generating a second control signal based on the absolute value of the difference value between the filtered reactive signal and the preset reactive signal reference value;
after the closed-loop adjustment of the excitation voltage of the generator based on the first control signal, the method further includes:
judging whether the damping inside the generator is smaller than a preset damping;
and if so, carrying out closed-loop regulation on the excitation voltage of the generator based on the second control signal until the absolute value of the difference value between the filtered reactive signal and the preset reactive signal reference value is smaller than the reactive signal difference value threshold.
Preferably, generating a high-side reactive signal based on the sampled current signal and the sampled voltage signal includes:
and multiplying the effective value of the sampling current signal and the effective value of the sampling voltage signal by a reactive coefficient to obtain the high-voltage side reactive signal.
Preferably, after outputting the first control signal based on an absolute value of a difference between the filtered voltage signal and the preset voltage signal reference value, the method further includes:
detecting whether the first control signal has communication abnormity;
and if so, stopping outputting the first control signal and the second control signal.
In order to solve the above technical problem, the present invention provides an automatic voltage control system, comprising:
the sampling unit is used for sampling the voltage signal of the high-voltage side bus to obtain a sampled voltage signal;
the filtering unit is used for filtering the signal to obtain a filtered voltage signal when the frequency deviation of the frequency in the sampling voltage signal and the set frequency is greater than a first preset frequency deviation;
a control unit, configured to generate a first control signal based on an absolute value of a difference between the effective value of the filtered voltage signal and a preset voltage signal reference value when the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is not less than a voltage difference threshold, and perform closed-loop adjustment on an excitation voltage of the generator based on the first control signal until the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is less than the voltage difference threshold.
In order to solve the above technical problem, the present invention provides an automatic voltage control apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the automatic voltage control method as described above when executing the computer program.
The invention provides an automatic voltage control method, a system and a device, the scheme samples a voltage signal of a high-voltage side bus, when the frequency deviation of the frequency of the sampled voltage signal and a set frequency is greater than a first preset frequency deviation, the signal is filtered, when the absolute value of the difference value of the filtered voltage signal and a preset voltage signal reference value is not less than a voltage difference value threshold value, a first control signal is generated, excitation voltage is adjusted based on the first control signal, closed-loop adjustment is carried out until the absolute value of the difference value of the effective value of the filtered voltage signal and the preset voltage signal reference value is less than a voltage difference value threshold value. When the voltage of the high-voltage side bus is adjusted, the frequency deviation between the frequency in the voltage of the high-voltage side bus and the set frequency is greater than the voltage signal filtering of the preset frequency deviation, and the influence on active power when the voltage of the high-voltage side bus is subjected to reactive power adjustment is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a process flow diagram of an automatic voltage control method provided by the present invention;
FIG. 2 is a schematic diagram of a specific link of an automatic voltage control method according to the present invention;
FIG. 3 is a diagram illustrating simulation results provided by the present invention;
FIG. 4 is a schematic diagram of another simulation result provided by the present invention;
FIG. 5 is a schematic structural diagram of an automatic voltage control system according to the present invention;
fig. 6 is a schematic structural diagram of an automatic voltage control apparatus according to the present invention.
Detailed Description
The core of the invention is to provide an automatic voltage control method, system and device, when the voltage of a high-voltage side bus is regulated, a voltage signal with the frequency deviation of the frequency in the voltage of the high-voltage side bus and the set frequency larger than the preset frequency deviation is filtered, and the influence on active power when the voltage of the high-voltage side bus is regulated in a reactive mode is reduced.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a process flow chart of an automatic voltage control method according to the present invention.
The method comprises the following steps:
s11: sampling a voltage signal of a high-voltage side bus to obtain a sampled voltage signal;
in this embodiment, it is considered that in the automatic voltage control method in the prior art, when a voltage oscillation of either sub-synchronization, a low-frequency voltage oscillation, or a mixed voltage oscillation of sub-synchronization and low-frequency occurs in a high-voltage side bus in an ac power grid, an excitation voltage of a generator whose output terminal is connected to a step-up transformer (simply referred to as a step-up transformer in fig. 2) is adjusted based on the voltage of the high-voltage side bus, and then an output voltage of the generator is adjusted, and finally reactive power adjustment of the high-voltage side bus is achieved.
In order to solve the problem, the voltage signal in the high-voltage side bus is considered to be an analog signal, but the analog signal is processed more complicatedly, so that the voltage signal in the high-voltage side bus is sampled firstly, the analog signal is converted into a digital signal, and the sampled voltage signal is obtained, and then the subsequent adjustment is carried out on the voltage of the high-voltage side bus based on the sampled voltage signal.
Specifically, as shown in fig. 2, fig. 2 is a schematic diagram of a specific link of the automatic voltage control method provided by the present invention. T in the voltage sampling segment in FIG. 2rAnd the filtering time constant of the voltage sampling link.
S12: when the frequency deviation of the frequency and the set frequency in the sampling voltage signal is larger than a first preset frequency deviation, filtering the signal to obtain a filtered voltage signal;
in this embodiment, in order to reduce the influence on the active power when the voltage oscillation component based on the high-voltage side bus and having a certain deviation from the set frequency is used for regulating the voltage of the high-voltage side bus, the present application filters the signal when the frequency deviation between the frequency in the sampled voltage signal and the set frequency is greater than the first preset frequency deviation, so as to filter the low-frequency and sub-synchronous voltage oscillation, for example, the first preset frequency deviation may be, but is not limited to, 0.1Hz, to obtain a filtered voltage signal, and the voltage oscillation in the filtered voltage signal, which is greater than the frequency component of 0.1Hz from the set frequency deviation, is filtered, so that the voltage oscillation component based on the high-voltage side bus does not contain the low-frequency and sub-synchronous voltage oscillation component, that is, the filtered voltage signal regulates the voltage of the high-voltage side bus, and reduces the influence on the.
The filter in fig. 2 is a filtering element, wherein the filter may be, but is not limited to, a third-order bakeware low-pass filter.
S13: judging whether the absolute value of the difference value between the effective value of the filtered voltage signal and the reference value of the preset voltage signal is smaller than a voltage difference value threshold value or not, and if not, entering S14;
after filtering a signal of which the frequency deviation between the frequency and the set frequency in the sampled voltage signal is greater than the first preset frequency deviation, the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value can reflect the fluctuation of the voltage of the high-voltage side bus, therefore, whether the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is smaller than the voltage difference threshold value or not is judged, whether the voltage of the high-voltage side bus needs to be adjusted or not can be judged, and when the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is judged to be smaller than the voltage difference threshold value, the voltage signal of which the frequency deviation between the frequency of the voltage of the high-voltage side bus and the set frequency is smaller than the preset frequency deviation can be reflected, so that the actual requirement is met, namely, the voltage of the.
The dead-zone function shown in fig. 2 is a function for determining whether an absolute value of a difference between the effective value of the filtered voltage signal and the reference value of the preset voltage signal is smaller than a voltage difference threshold.
S14: generating a first control signal based on an absolute value of a difference between the effective value of the filtered voltage signal and a preset voltage signal reference value, and performing closed-loop regulation on the excitation voltage of the generator based on the first control signal until the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is less than a voltage difference threshold value.
However, when it is determined that the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is not less than the voltage difference threshold, it may be reflected that the frequency deviation between the frequency of the voltage of the high-voltage side bus and the set frequency is not less than the voltage signal of the preset frequency deviation, and the actual requirement is not met, i.e., the voltage of the high-voltage side bus needs to be adjusted. In addition, the field voltage of the generator is adjusted based on the first control signal, and the field voltage of the generator is also adjusted based on other parameters, such as the field current and the generator terminal voltage of the generator. Specifically, after the excitation voltage of the generator is adjusted, the generator terminal voltage of the generator can be adjusted, so that the purpose of adjusting the voltage of the high-voltage side bus is achieved. Specifically, as shown in fig. 2, an AVR (Automatic Voltage Regulator) in the figure performs closed-loop regulation of the excitation Voltage of the generator based on the first control signal.
Specifically, for example, as shown in fig. 3, fig. 3 is a schematic diagram of a simulation result provided by the present invention. The solid line in fig. 3 is a voltage waveform containing a 20Hz subsynchronous oscillation component, and the subsynchronous oscillation component is filtered by the present application, and the waveform is as shown by the dotted line in fig. 3, and the voltage curve only contains a low-frequency trend component, so that the interference of subsynchronous oscillation is filtered, and the voltage of the high-voltage side bus can be adjusted based on the low-frequency trend component.
In addition, for example, as shown in fig. 4, fig. 4 is a schematic diagram of another simulation result provided by the present invention. The solid line in fig. 4 is a voltage waveform containing an electromechanical oscillation component of 5Hz, and the subsynchronous oscillation component is filtered by the present application, and the waveform is shown as the dotted line in fig. 4, and the voltage curve only contains a low-frequency trend component, so that the interference of the electromechanical oscillation is filtered, and the voltage of the high-voltage side bus can be adjusted based on the low-frequency trend component.
In addition, the preset voltage signal reference value in the present application is a pre-stored voltage signal reference value or a voltage signal reference value set by a user based on the actual demand of the current high-side bus voltage.
In conclusion, when the voltage of the high-voltage side bus is adjusted, the voltage signal with the frequency deviation between the frequency in the voltage of the high-voltage side bus and the set frequency larger than the preset frequency deviation is filtered, and the influence on active power when the voltage of the high-voltage side bus is subjected to reactive power adjustment is reduced.
On the basis of the above-described embodiment:
as a preferred embodiment, generating the first control signal based on an absolute value of a difference between the effective value of the filtered voltage signal and a preset voltage signal reference value comprises:
subtracting the effective value of the filtered voltage signal from the reference value of the preset voltage signal and taking an absolute value to obtain a voltage increment signal;
and multiplying the voltage increment signal by a time constant K, and performing delay amplification processing on a result obtained by the multiplication to be output as a first control signal.
In this embodiment, considering that the voltage of the high-voltage side bus is subsequently adjusted in a reactive manner, the effective value of the filtered voltage signal is subtracted from the reference value of the preset voltage signal, the absolute value is obtained, the obtained voltage increment signal is multiplied by the time constant K for converting the voltage increment into the reactive increment, so that the voltage signal increment is converted into the reactive signal increment, that is, Δ Q in fig. 21Thereby controlling the subsequent reactive regulation of the high-side bus voltage. In addition, this application carries out delay processing with idle signal increment, has reduced because the system response is too fast to the damage that causes the inside device of generator carries out delay processing with idle signal increment again, makes control process can steadily realize.
Specifically, the delay amplification section K in fig. 2Q/Tis, wherein TiFor the time constant of automatic voltage control, s is the Laplace operator, KQThe reactive power amplification factor is automatically controlled by voltage.
As a preferred embodiment, before the closed-loop adjusting the excitation voltage of the generator based on the first control signal, the method further includes:
sampling a current signal of a high-voltage side bus to obtain a sampled current signal;
generating a high-voltage side reactive signal based on the sampling current signal and the sampling voltage signal;
filtering a signal of which the frequency deviation between the frequency and the set frequency in the high-voltage side reactive signal is greater than a second preset frequency deviation to obtain a filtered reactive signal;
judging whether the absolute value of the difference value between the filtered reactive signal and a preset reactive signal reference value is smaller than a reactive signal difference value threshold value or not;
if not, generating a second control signal based on the absolute value of the difference value between the filtered reactive signal and the preset reactive signal reference value;
after closed-loop adjustment is performed on the excitation voltage of the generator based on the first control signal, the method further includes:
judging whether the damping inside the generator is smaller than a preset damping;
and if so, carrying out closed-loop regulation on the excitation voltage of the generator based on the second control signal until the absolute value of the difference between the filtered reactive signal and the preset reactive signal reference value is smaller than the reactive signal difference threshold.
In this embodiment, when the voltage of the high-voltage side bus is adjusted by the first control signal generated based on the absolute value of the difference between the filtered voltage signal and the preset voltage signal reference value, the situation that the damping inside the generator is smaller than the preset damping may occur, and the situation may cause a certain influence on the generator itself.
The method includes the steps of generating a high-voltage side reactive signal based on a sampling current signal and a sampling voltage signal, filtering a signal with frequency deviation of frequency and set frequency in the high-voltage side reactive signal larger than second preset frequency deviation, for example, the second preset frequency deviation can be but is not limited to 0.1Hz, judging whether an absolute value of a difference value between the filtered reactive signal and a preset reactive signal reference value is smaller than a reactive signal difference value threshold value or not, judging whether voltage of a high-voltage side bus needs to be adjusted or not, and generating a second control signal based on the absolute value of the difference value between the filtered reactive signal and the preset reactive signal reference value, namely delta Q in figure 22When the absolute value of the difference value between the filtered reactive signal and the preset voltage signal reference value is judged to be smaller than the reactive signal difference value threshold value, the high-voltage side bus can be reflectedThe frequency deviation of the frequency of the voltage of the line and the set frequency is smaller than the voltage signal of the preset frequency deviation, so that the actual requirement is met, namely the voltage of the high-voltage side bus is not required to be adjusted.
However, when the absolute value of the difference between the filtered reactive signal and the preset reactive signal reference value is judged to be not less than the reactive signal difference threshold, the voltage signal that the frequency deviation of the voltage of the high-voltage side bus and the set frequency is not less than the preset frequency deviation can be reflected, the actual requirement is not met, namely the voltage of the high-voltage side bus needs to be adjusted, therefore, a second control signal is generated based on the absolute value of the difference between the filtered reactive signal and the preset reactive signal reference value, and when the damping inside the generator is judged to be less than the preset damping, the excitation voltage of the generator is subjected to closed-loop adjustment through the second control signal, so that the purpose of adjusting the voltage of the high-voltage side bus is achieved.
In conclusion, the method and the device reduce adverse effects caused by reduction of damping of the generator when the voltage of the high-voltage side bus is adjusted by the first control signal generated based on the absolute value of the difference value between the filtered voltage signal and the preset voltage signal reference value.
As a preferred embodiment, generating a high-side reactive signal based on the sampled current signal and the sampled voltage signal includes:
and multiplying the effective value of the sampling current signal and the effective value of the sampling voltage signal by a reactive coefficient to obtain a high-voltage side reactive signal.
This application is when generating high pressure side reactive signal, specifically realizes for the effective value with sampling current signal and sampling voltage signal's effective value multiply to multiply the reactive coefficient, the sinusoidal value of sampling current signal and sampling voltage signal's phase difference promptly, thereby obtains high pressure side reactive signal, thereby is convenient for follow-up regulation to high pressure side busbar voltage.
As a preferred embodiment, after outputting the first control signal based on an absolute value of a difference between the filtered voltage signal and a preset voltage signal reference value, the method further includes:
detecting whether the first control signal has communication abnormity;
if the first control signal and the second control signal exist, the output of the first control signal and the second control signal is stopped.
In this embodiment, considering that some faults with abnormal communication may occur in the process from sampling the high-voltage side bus voltage to outputting the first control signal, for example, communication is interrupted, at this time, the output first control signal may have abnormal communication, which may affect the process of adjusting the high-voltage side bus voltage.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an automatic voltage control system provided in the present invention, the system includes:
the sampling unit 51 is used for sampling the voltage signal of the high-voltage side bus to obtain a sampling voltage signal;
the filtering unit 52 is configured to filter the signal to obtain a filtered voltage signal when a frequency deviation between a frequency in the sampled voltage signal and a set frequency is greater than a first preset frequency deviation;
and a control unit 53, configured to, when an absolute value of a difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is not less than the voltage difference threshold, generate a first control signal based on the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value, and perform closed-loop adjustment on the excitation voltage of the generator based on the first control signal until the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is less than the voltage difference threshold.
For the introduction of the automatic voltage control system provided by the present invention, reference is made to the above method embodiments, and the present invention is not repeated herein.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an automatic voltage control apparatus provided in the present invention, the apparatus includes:
a memory 1 for storing a computer program;
and a processor 2 for implementing the steps of the automatic voltage control method as described above when executing the computer program.
For the description of the automatic voltage control apparatus provided by the present invention, please refer to the above method embodiments, which are not repeated herein.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An automatic voltage control method, comprising:
sampling a voltage signal of a high-voltage side bus to obtain a sampled voltage signal;
when the frequency deviation of the frequency and the set frequency in the sampling voltage signal is larger than a first preset frequency deviation, filtering the signal to obtain a filtered voltage signal;
judging whether the absolute value of the difference value between the effective value of the filtered voltage signal and a preset voltage signal reference value is smaller than a voltage difference value threshold value or not;
if not, generating a first control signal based on the absolute value of the difference value between the effective value of the filtered voltage signal and the preset voltage signal reference value, and performing closed-loop regulation on the excitation voltage of the generator based on the first control signal until the absolute value of the difference value between the effective value of the filtered voltage signal and the preset voltage signal reference value is smaller than the voltage difference threshold value.
2. The automatic voltage control method of claim 1, wherein generating a first control signal based on an absolute value of a difference between an effective value of the filtered voltage signal and the preset voltage signal reference value comprises:
subtracting the effective value of the filtered voltage signal from the preset voltage signal reference value and taking an absolute value to obtain a voltage increment signal;
and multiplying the voltage increment signal by a time constant K, and performing delay amplification processing on a result obtained by the multiplication to be output as the first control signal.
3. The automatic voltage control method of claim 1, wherein prior to closed-loop adjusting the field voltage of the generator based on the first control signal, further comprising:
sampling a current signal of a high-voltage side bus to obtain a sampled current signal;
generating a high-voltage side reactive signal based on the sampling current signal and the sampling voltage signal;
filtering a signal of which the frequency deviation between the frequency in the high-voltage side reactive signal and the set frequency is greater than a second preset frequency deviation to obtain a filtered reactive signal;
judging whether the absolute value of the difference value between the filtered reactive signal and a preset reactive signal reference value is smaller than a reactive signal difference value threshold value or not;
if not, generating a second control signal based on the absolute value of the difference value between the filtered reactive signal and the preset reactive signal reference value;
after the closed-loop adjustment of the excitation voltage of the generator based on the first control signal, the method further includes:
judging whether the damping inside the generator is smaller than a preset damping;
and if so, carrying out closed-loop regulation on the excitation voltage of the generator based on the second control signal until the absolute value of the difference value between the filtered reactive signal and the preset reactive signal reference value is smaller than the reactive signal difference value threshold.
4. The automatic voltage control method of claim 3, wherein generating a high side reactive signal based on the sampled current signal and the sampled voltage signal comprises:
and multiplying the effective value of the sampling current signal and the effective value of the sampling voltage signal by a reactive coefficient to obtain the high-voltage side reactive signal.
5. The automatic voltage control method of claim 3, wherein after outputting the first control signal based on an absolute value of a difference between the filtered voltage signal and the preset voltage signal reference value, further comprising:
detecting whether the first control signal has communication abnormity;
and if so, stopping outputting the first control signal and the second control signal.
6. An automatic voltage control system, comprising:
the sampling unit is used for sampling the voltage signal of the high-voltage side bus to obtain a sampled voltage signal;
the filtering unit is used for filtering the signal to obtain a filtered voltage signal when the frequency deviation of the frequency in the sampling voltage signal and the set frequency is greater than a first preset frequency deviation;
a control unit, configured to generate a first control signal based on an absolute value of a difference between the effective value of the filtered voltage signal and a preset voltage signal reference value when the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is not less than a voltage difference threshold, and perform closed-loop adjustment on an excitation voltage of the generator based on the first control signal until the absolute value of the difference between the effective value of the filtered voltage signal and the preset voltage signal reference value is less than the voltage difference threshold.
7. An automatic voltage control apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the automatic voltage control method according to any one of claims 1 to 5 when executing the computer program.
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