CN117595266B - Harmonic wave treatment method, device, equipment and storage medium based on APF device - Google Patents
Harmonic wave treatment method, device, equipment and storage medium based on APF device Download PDFInfo
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Abstract
The application relates to the technical field of equipment harmonic governance, in particular to a harmonic governance method, a device, equipment and a storage medium based on an APF device, wherein the method comprises the following steps: calculating a maximum load current effective value based on the detected three-phase load current signal; comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result; judging whether the current APF device can be started to operate or not based on the comparison operation result; if the operation can be started, detecting the total harmonic distortion rate of the power grid voltage, and obtaining the maximum total harmonic distortion rate of the power grid voltage; when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, controlling the APF device to start harmonic treatment; and controlling the current of the APF device in the harmonic treatment process. The method realizes intelligent, energy-saving and dynamic harmonic treatment, and improves system stability and power quality.
Description
Technical Field
The application relates to the field of harmonic governance, in particular to a harmonic governance method, device, equipment and storage medium based on an APF device.
Background
The active power filter (APF: active Power Filter) is used for harmonic treatment of the power distribution and utilization power grid, and can eliminate harmonic pollution of the power grid and improve the power quality of the power grid. Meanwhile, the active power filter is used as a power electronic device, and the active power filter can bring about some problems of energy consumption and noise during operation, in practical application, the load of a power system is generally in dynamic change, and the APF device can output a larger current or even a full-load current in a certain period of time, and output a smaller current or even no current in a nearly no-load operation in a certain period of time. The national standard "Power quality Utility grid harmonic" (GB/T14549-1993) specifies the total harmonic distortion (THDU: total Harmonic Voltage Distortion) of the grid voltage: the nominal voltage of the power grid is 0.38kV, and the total harmonic distortion rate of the voltage is not higher than 5%. Based on this, we should choose not to carry out harmonic remediation for application scenarios or time periods where the total harmonic distortion of the grid voltage is already smaller than the national standard requirements. However, the existing active power filter generally sets the harmonic frequency to be treated when in application, and the filter carries out maximum treatment on the corresponding subharmonic according to the setting item without intelligent regulation.
Therefore, aiming at the field of harmonic control of the power grid, how to comprehensively consider the harmonic control and energy conservation and noise reduction is a problem to be solved urgently.
Disclosure of Invention
The main purpose of the application is to provide a harmonic treatment method, a device, equipment and a storage medium based on an APF device, and aims to solve the technical problem of how to comprehensively consider harmonic treatment and energy conservation and noise reduction aiming at the field of power grid harmonic treatment.
In order to achieve the above object, a first aspect of the present application proposes a harmonic treatment method based on an APF device, the method comprising: calculating a maximum load current effective value based on the detected three-phase load current signal;
comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result;
judging whether the current APF device can be started to operate or not based on the comparison operation result;
if the operation can be started, detecting the total harmonic distortion rate of the power grid voltage, and obtaining the maximum total harmonic distortion rate of the power grid voltage;
and when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, controlling the APF device to start harmonic treatment.
Further, the step of calculating a maximum load current effective value based on the detected three-phase load current signal includes:
Preprocessing the collected three-phase load current signals;
calculating a current effective value based on the preprocessed three-phase load current signal;
and comparing the current effective values, and selecting the largest current effective value as the largest load current effective value.
Further, the step of comparing the maximum load current effective value with the value in the hysteresis comparator and obtaining a comparison operation result includes:
setting an upper limit threshold and a lower limit threshold in a hysteresis comparator;
setting a load current reference threshold setting value between threshold ranges of the upper limit threshold and the lower limit threshold;
calculating the difference value between the load current reference threshold value set value and the lower limit threshold value;
calculating the sum of the load current reference threshold set value and the upper limit threshold;
judging whether the maximum load current effective value is smaller than the difference value or not, judging whether the maximum load current effective value is larger than the sum value or not, and obtaining a judging result, wherein the judging result is the comparison operation result.
Further, the step of determining whether the current APF device can be started to operate based on the comparison operation result includes:
If the maximum load current effective value is smaller than the difference value, controlling the APF device to enter a standby state;
and if the maximum load current effective value is larger than the sum value, judging that the operation can be started.
Further, if the operation can be started, detecting the total harmonic distortion rate of the grid voltage, and obtaining the maximum total harmonic distortion rate of the grid voltage, including:
acquiring voltage waveform data of each phase based on the acquired voltage signals of the power grid;
analyzing the voltage waveform data to obtain each order of harmonic components;
calculating the total harmonic distortion rate of the voltage based on the harmonic components of each order;
and comparing the calculated voltage total harmonic distortion rates of all phases with each other to obtain the maximum grid voltage total harmonic distortion rate.
Further, when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, the step of controlling the APF device to start harmonic treatment includes:
and when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, starting a corresponding APF device according to the phase where the maximum power grid voltage total harmonic distortion rate is located.
Further, the step of performing current control on the APF device in the harmonic treatment process includes:
judging whether the current maximum grid voltage total harmonic distortion rate is smaller than an expected set value or not;
and if the output current is smaller than the expected set value, controlling the output current of the APF device to stop increasing continuously.
The second aspect of the present application also proposes an energy-saving and noise-reducing control device for harmonic remediation of an APF device, the device comprising:
the effective value calculating module is used for calculating the maximum load current effective value based on the detected three-phase load current signals;
the comparison operation module is used for comparing the maximum load current effective value with the numerical value in the hysteresis comparator and obtaining a comparison operation result;
the operation judging module is used for judging whether the current APF device can be started to operate or not based on the comparison operation result;
the maximum distortion module is used for detecting the total harmonic distortion rate of the power grid voltage if the operation can be started, and obtaining the maximum total harmonic distortion rate of the power grid voltage;
the treatment starting module is used for starting when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold value, and controlling the APF device to start harmonic treatment;
And the current control module is used for controlling the current of the APF device in the harmonic treatment process.
A third aspect of the present application also proposes a computer device comprising a memory storing a computer program and a processor implementing the steps of any of the methods described above when the processor executes the computer program.
A fourth aspect of the present application also proposes a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method of any of the preceding claims.
According to the harmonic treatment method based on the APF device, provided by the application, the load current is monitored in real time, and the opening and closing of the APF device are intelligently controlled, so that the load fluctuation of the power grid can be responded efficiently, and the influence of the harmonic on the power grid and equipment is reduced. When the total harmonic distortion rate of the power grid voltage exceeds a set threshold value, the APF device is automatically started to carry out harmonic treatment, and the harmonic treatment effect is optimized through current control. The method realizes intelligent and dynamic harmonic governance, improves system stability and power quality, effectively reduces adverse effects of harmonic on a power grid and electric equipment, and meets the requirements of a modern power system on efficient, energy-saving and intelligent harmonic governance.
Drawings
Fig. 1 is a schematic flow chart of a harmonic treatment method based on an APF device according to an embodiment of the present application;
fig. 2 is a schematic block diagram of a harmonic suppression device based on an APF device according to an embodiment of the present application;
fig. 3 is a block diagram schematically illustrating a structure of a computer device according to an embodiment of the present application.
Fig. 4 is a schematic diagram of an application scenario in which 3 sets of CTs are used to detect load-side current when an APF device is incorporated into a three-phase four-wire system;
fig. 5 is a schematic diagram of an application scenario in which 3 sets of CTs are used to detect grid-side current when an APF device is incorporated into a three-phase four-wire system.
FIG. 6 is a schematic diagram showing the maximum load current effective value being sent to the hysteretic comparator for operation;
fig. 7 is a schematic diagram of the total harmonic distortion rate of the grid voltage sent to the PI controller to participate in the output current control of the APF device.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Description of the embodiments
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
As used herein, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, modules, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any module and all combination of one or more of the associated listed items.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Referring to fig. 1, an embodiment of the present invention provides a harmonic treatment method based on an APF device, including steps S1 to S6, specifically:
s1, calculating a maximum load current effective value based on the detected three-phase load current signal.
The method comprises the steps of firstly collecting load current signals of A/B/C three phases through a current transformer arranged on a load side or a current transformer on a power grid side, wherein the implementation method can be that a group of current transformers are respectively arranged on the A/B/C three phases on the load side as shown in fig. 4, or a group of current transformers are respectively arranged on the A/B/C three phases on the power grid side as shown in fig. 5. In APF device applications, there is a relationship: the sum of the grid current and the compensation current of the APF device is the load current, so that a required load current signal can be obtained no matter the current transformer is arranged on the load side or the grid side. For the load current signal of each phase, the effective value calculation is performed, that is, the load current effective value on the phase is obtained by summing the squares of the current signals, averaging and taking the square root thereof. And comparing the effective values in the three phases, and taking the maximum value as the maximum load current effective value. The obtained maximum load current effective value is used for comparison operation of a subsequent hysteresis comparator to determine whether the APF device is started or not, and necessary data support is provided for subsequent harmonic treatment.
S2, comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result.
The hysteresis comparator is a set threshold range for determining whether the maximum load current effective value exceeds the threshold set in the hysteresis comparator. The threshold may be set according to specific needs and system requirements. And comparing the maximum load current effective value with the value of the hysteresis comparator. If the maximum load current effective value is greater than the hysteresis comparator value, it can be determined whether the present APF device can be turned on.
And S3, judging whether the current APF device can be started to operate or not based on the comparison operation result.
And according to the comparison operation of the previous step, obtaining a comparison result, namely judging whether the effective value of the maximum load current meets a certain threshold requirement. For example: judging whether the effective value of the maximum load current is smaller than the difference value between the reference threshold value set value of the load current and the lower limit threshold value or larger than the sum value of the reference threshold value set value of the load current and the upper limit threshold value, and judging whether the current APF device can be started to operate or the APF device needs to be closed currently according to different threshold requirements met by the effective value of the maximum load current. Specifically, according to the judgment result, corresponding control operation is carried out, and if the operation can be started, an APF device is started for harmonic treatment; if the operation cannot be started, the APF device is maintained to be in a closed state. Thereby realizing the effective management of the power grid harmonic wave.
And S4, if the operation can be started, detecting the total harmonic distortion rate of the power grid voltage, and obtaining the maximum total harmonic distortion rate of the power grid voltage.
If the power grid is judged to be started in the last step, firstly, an A/B/C three-phase voltage signal of the power grid is collected through a voltage sensor arranged on the power grid side, the collected power grid voltage signal is processed, and the total harmonic distortion rate of the power grid voltage is calculated. This typically involves decomposing the voltage signal into a fundamental component and a respective subharmonic component, and then using these components to calculate the value of the total harmonic distortion. And calculating to obtain the total harmonic distortion rate of the power grid voltage of each phase, and then selecting the maximum value from the total harmonic distortion rate as the maximum total harmonic distortion rate of the power grid voltage. The resulting maximum grid voltage total harmonic distortion is used for subsequent control and analysis. And necessary data support is provided for subsequent APF device operation and power grid quality analysis.
And S5, when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, controlling the APF device to start harmonic treatment.
And (3) obtaining the value of the maximum power grid voltage total harmonic distortion rate calculated in the previous step, and comparing the maximum power grid voltage total harmonic distortion rate with a preset voltage total harmonic distortion threshold (generally suggesting that the voltage total harmonic distortion threshold is set to be smaller than or equal to a national standard required value). If the maximum grid voltage total harmonic distortion rate is higher than a set threshold, controlling an APF device to be started for harmonic treatment; otherwise, the APF device need not be turned on. If the APF device is required to be started, a control signal is sent to enable the APF device to start working according to a system control strategy, and the inverter generates corresponding harmonic current to compensate harmonic components in the power grid. Through the step, the operation of the APF device can be intelligently controlled according to the real-time condition of the maximum power grid voltage total harmonic distortion rate, so that the power grid harmonic treatment is effectively carried out, and the quality and stability of the power grid are improved. Three setting methods of the voltage total harmonic distortion setting threshold are adopted, and the method 1 is as follows: by means of manual direct setting. And inputting and storing the voltage total harmonic distortion setting threshold value into a parameter storage area of the APF device in a parameter setting mode so as to finish the setting work of the voltage total harmonic distortion setting threshold value. Method 2: the manner of setting is indirectly by manually setting the application field and the load type. According to practical application occasions of the APF device, including but not limited to application fields such as lithium battery industry, photovoltaic crystal pulling industry, photovoltaic battery industry, chemical industry and metallurgical industry, load characteristics of each application field are extracted, loads are classified and analyzed, and voltage total harmonic distortion set thresholds corresponding to different types of loads in different application fields are formed. In this way, the application field and the load type are input in a parameter setting mode and stored in a parameter storage area of the APF device, and the APF device automatically sets a corresponding voltage total harmonic distortion setting threshold value after recognizing the parameter. Over time and with wider application of APF devices, the application areas and load types will be more complete and the methods of the present application will have more general applicability. Method 3: and the method is realized by an intelligent automatic setting mode of a load data expert database built in the APF device. According to practical application occasions of the APF device, including but not limited to application fields such as lithium battery industry, photovoltaic crystal pulling industry, photovoltaic battery industry, chemical industry, metallurgical industry and the like, load characteristics of each application field are extracted, and detailed big data analysis is performed on loads. And forming a load harmonic data expert database according to different types of load harmonic components and contents of different power levels, and introducing the load harmonic data expert database into an APF device. And the APF device extracts a load current characteristic value according to the acquired load current signal, compares the load current characteristic value with a load harmonic data expert database, and intelligently and automatically sets a voltage total harmonic distortion setting threshold value. Over time and with wider application of APF devices, the load harmonic data expert database will be more complete, and the method of the present invention will have more general applicability. The above 3 methods can be input and stored in the parameter storage area of the APF device in a parameter setting manner, so as to complete the selection of one of the methods.
S6, current control is carried out on the APF device in the harmonic treatment process.
And continuously monitoring the change condition of the total harmonic distortion rate of the maximum grid voltage, and ensuring that the latest data are acquired in time. And analyzing the characteristics and frequency distribution of harmonic components existing in the power grid according to the total harmonic distortion rate of the maximum power grid voltage monitored in real time. Based on the analysis result of the harmonic component, the harmonic current compensation amount required to be generated by the APF device is calculated so as to offset the harmonic component existing in the power grid. According to the harmonic current compensation requirement, the APF device is subjected to current control adjustment, so that the harmonic current output by the APF device is ensured to be cancelled with harmonic components in the power grid, and the effect of harmonic treatment is achieved. Through the steps, intelligent current control based on the maximum power grid voltage total harmonic distortion rate can be realized, so that the APF device can effectively compensate the harmonic wave in the power grid in real time, and the quality and stability of the power grid are improved.
In one embodiment, the step of calculating the maximum load current effective value based on the detected three-phase load current signal includes:
s10, preprocessing the collected three-phase load current signals;
s10, calculating a current effective value based on the preprocessed three-phase load current signal;
S10, comparing the current effective values, and selecting the largest current effective value as the largest load current effective value.
In this embodiment, filtering and denoising are performed on the collected three-phase load current signal, so as to ensure accuracy and stability of the signal. The technology of a digital filter, a low-pass filter and the like can be adopted to remove unnecessary high-frequency noise and interference, so that a clear load current signal is obtained. The effective value calculation is performed on the preprocessed three-phase load current signal, and the load current effective value of each phase can be obtained by using an RMS (root mean square) algorithm or other effective value calculation methods. And comparing the calculated load current effective values of the three phases, and selecting the largest one as the maximum load current effective value. The selection of the effective value of the maximum load current can be achieved by a comparison algorithm, such as simply comparing the three effective values to select the maximum value. The method and the device can preprocess the collected three-phase load current signals and calculate the maximum load current effective value. Such a process may help the system better understand and evaluate the actual condition of the load, providing an important reference for further operation and management of the power system.
In one embodiment, the step of comparing the maximum load current effective value with a value in a hysteresis comparator and obtaining a comparison result includes:
s20, setting an upper limit threshold and a lower limit threshold in a hysteresis comparator;
s21, setting a load current reference threshold value set value between threshold ranges of the upper limit threshold value and the lower limit threshold value;
s22, calculating the difference value between the load current reference threshold value set value and the lower limit threshold value;
s23, calculating the sum of the load current reference threshold value set value and the upper limit threshold value;
s24, judging whether the maximum load current effective value is smaller than the difference value or not, judging whether the maximum load current effective value is larger than the sum value or not, and acquiring a judging result, wherein the judging result is the comparison operation result.
In the present embodiment, in the system, the upper limit threshold and the lower limit threshold of the hysteresis comparator are first set. These thresholds will be used to determine the effective range of load current values. Within the determined threshold range, a load current reference threshold set value is set as a reference value for subsequent comparison operations, as shown in fig. 6. And then, carrying out difference value calculation on the load current reference threshold value set value and the lower limit threshold value to obtain a numerical value for the next comparison operation. And carrying out sum calculation on the set value of the load current reference threshold and the upper limit threshold to obtain another numerical value for the next comparison operation. And comparing the maximum load current effective value with the sum of the differences to judge whether the effective value is in a preset range. And obtaining a judging result, namely a comparison operation result, according to the comparison result. The embodiment has the advantages that accurate judgment and control can be carried out on the current value through the hysteresis comparator, and accurate judgment on the maximum load current value can be realized through setting an upper limit threshold value and a lower limit threshold value and calculating a difference value sum value, so that erroneous judgment and misoperation are avoided. In addition, the threshold range and the reference threshold can be flexibly set according to the requirements of specific systems, and the method is suitable for the working environments and requirements of different systems. The hysteresis comparator can monitor the effective change of the maximum load current value in real time and quickly respond to ensure the stability and the safety of the system under the dynamic working condition. The load current reference threshold setting value is set by three methods, namely, method 1: by means of manual direct setting. And inputting and storing the load current reference threshold set value into a parameter storage area of the APF device in a parameter setting mode so as to finish the setting work of the load current reference threshold set value. Method 2: the manner of setting is indirectly by manually setting the application field and the load type. According to practical application occasions of the APF device, including but not limited to application fields such as lithium battery industry, photovoltaic crystal pulling industry, photovoltaic battery industry, chemical industry and metallurgical industry, load characteristics of each application field are extracted, loads are classified and analyzed, and load current reference threshold value set values corresponding to different types of loads in different application fields are formed. In this way, by inputting the application field and the load type in a parameter setting manner and storing the input field and the load type in a parameter storage area of the APF device, the APF device automatically sets a corresponding load current reference threshold set value after identifying the parameter. Over time and with wider application of APF devices, the application areas and load types will be more complete and the methods of the present application will have more general applicability. Method 3: and the method is realized by an intelligent automatic setting mode of a load data expert database built in the APF device. According to practical application occasions of the APF device, including but not limited to application fields such as lithium battery industry, photovoltaic crystal pulling industry, photovoltaic battery industry, chemical industry, metallurgical industry and the like, load characteristics of each application field are extracted, and detailed big data analysis is performed on loads. And forming a load harmonic data expert database according to different types of load harmonic components and contents of different power levels, and introducing the load harmonic data expert database into an APF device. And the APF device extracts a load current characteristic value according to the acquired load current signal, compares the load current characteristic value with a load harmonic data expert database, and intelligently and automatically sets a load current reference threshold value set value. Over time and with wider application of APF devices, the load harmonic data expert database will be more complete, and the method of the present invention will have more general applicability. The above 3 methods can be input and stored in the parameter storage area of the APF device in a parameter setting manner, so as to complete the selection of one of the methods.
In an embodiment, the step of determining whether the current APF device can start to operate based on the comparison operation result includes:
s30, if the maximum load current effective value is smaller than the difference value, controlling the APF device to enter a standby state;
and S31, if the maximum load current effective value is larger than the sum value, judging that the operation can be started.
In this embodiment, when the maximum load current effective value is smaller than the set difference value, it may indicate that the system load is low, and at this time, if the APF device is forced to continue to operate, it may cause energy waste of the system and generate unnecessary pressure on the equipment, so that it is necessary to control the APF device into a standby (shutdown) state, so that unnecessary energy consumption and equipment damage are avoided. When the maximum load current effective value is greater than the set sum value, it may indicate that the system load is too high, which may cause unstable system operation and even damage to equipment. Therefore, under the condition, the APF device can be allowed to start to operate so as to perform power factor correction, harmonic suppression and other works on the system, ensure that the system operates in a normal range and improve the stability and efficiency of the system. Through the control strategy, the running state of the APF device can be flexibly controlled according to the real-time load condition, so that the safe and stable running of the system is ensured, and meanwhile, the energy sources are saved to the maximum extent and the equipment loss is reduced.
In an embodiment, if the operation can be started, the step of detecting the total harmonic distortion of the grid voltage and obtaining the maximum total harmonic distortion of the grid voltage includes:
s40, acquiring voltage waveform data of each phase based on the acquired voltage signals of the power grid;
s41, analyzing the voltage waveform data to obtain harmonic components of each order;
s42, calculating the total harmonic distortion rate of the voltage based on the harmonic components of each step;
s43, comparing the calculated voltage total harmonic distortion rates of all phases to obtain the maximum grid voltage total harmonic distortion rate.
In this embodiment, the voltage waveform data of each phase needs to be acquired based on the acquired voltage signal of the power grid first, and this may be achieved by using a sensor or a measuring device, for example, to acquire the voltage signal of each phase using a voltage sensor, and convert it into digital waveform data for subsequent processing. This step is designed to ensure accurate voltage waveform data is obtained, providing a reliable basis for subsequent analysis and calculation. Then, the voltage waveform data is converted into frequency domain data using fourier transform or the like, and then each order harmonic component is identified and extracted. The reason for this design is that harmonic components with various frequencies exist in the power grid, and the analysis of each order of harmonic components can provide necessary information for the subsequent calculation of the total harmonic distortion rate. The voltage total harmonic distortion rate can be calculated according to a related formula or algorithm from the obtained harmonic components, for example, the square root of the voltage total harmonic distortion rate= (Σ (square of each harmonic voltage effective value)) and the fundamental wave voltage effective value can be used to calculate, the harmonic distortion condition in the power grid can be intuitively reflected, and finally, the maximum harmonic distortion rate can be determined and recorded by comparing the voltage total harmonic distortion rates of the phases. The most severe harmonic distortion is detected in order to take corrective action.
In an embodiment, when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, the step of controlling the APF device to turn on harmonic suppression includes:
and S50, when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, starting a corresponding APF device according to the phase where the maximum power grid voltage total harmonic distortion rate is located.
In this embodiment, when the maximum voltage total harmonic distortion rate is detected to be higher than the set threshold, the corresponding APF device needs to be started according to the phase where the maximum voltage total harmonic distortion rate is located. Since the harmonic problems present in the power grid are typically phase dependent, there may be differences in harmonic content between different phases. Therefore, during harmonic treatment, only the phase with serious harmonic problem is required to be processed, and the waste of starting the APF device for all phases is avoided. By determining to start the corresponding APF device according to the phase position of the maximum voltage total harmonic distortion rate, accurate harmonic treatment can be realized, and the electric energy quality is improved. The design of the embodiment aims to pointedly treat the harmonic problem in the power grid, avoid unnecessarily starting the APF devices of all phases, thereby improving the energy utilization efficiency and reducing the cost.
In one embodiment, the step of controlling the current of the APF device in the harmonic remediation process comprises:
s60, judging whether the current maximum grid voltage total harmonic distortion rate is smaller than an expected set value;
and S61, if the output current is smaller than the expected set value, controlling the output current of the APF device to stop continuously increasing.
In this embodiment, by monitoring the maximum grid voltage total harmonic distortion in real time and comparing the maximum grid voltage total harmonic distortion with the expected set value, it can be timely determined whether the output current of the APF device needs to be adjusted. Once the set value is reached, the output current of the APF device can be controlled, and the continuous increase is avoided, so that the harmonic distortion in the power grid is effectively treated. Specifically, as shown in fig. 7, the difference between the fed-back real-time maximum power grid voltage total harmonic distortion rate and the voltage total harmonic distortion set threshold (THDU threshold set value) is fed into a PI controller, and then the output of the PI controller participates in regulating and controlling the compensation current output of the APF device, so as to form a closed-loop control system. Such a closed loop control system may automatically adjust the compensation current output of the APF device to bring the maximum grid voltage total harmonic distortion rate close to the desired set point. By this control, the APF device can be prevented from operating unnecessarily or carrying out unnecessary heavy load or even full load output in some occasions or time periods. The method is favorable for reducing the additionally brought energy consumption problem and noise problem, and realizes the organic unification of harmonic wave treatment, energy conservation and noise reduction. In summary, the present embodiment helps to achieve accurate control of the APF device output current to cope with harmonic distortion problems in the power grid and minimize energy consumption and noise problems.
Referring to fig. 2, a block diagram of a pet status monitoring device according to an embodiment of the present application, the device includes:
an effective value calculating module 100 for calculating a maximum load current effective value based on the detected three-phase load current signal;
the comparison operation module 200 is configured to compare the maximum load current effective value with a value in a hysteresis comparator, and obtain a comparison operation result;
the operation judging module 300 is configured to judge whether the current APF device can be started to operate based on the comparison operation result;
the maximum distortion module 400 is configured to detect a total harmonic distortion rate of the power grid voltage if the operation can be started, and obtain the maximum total harmonic distortion rate of the power grid voltage;
a governance opening module 500, configured to open when the maximum grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, and control the APF device to open harmonic governance;
and the current control module 600 is used for controlling the current of the APF device in the harmonic treatment process.
In one embodiment, the effective value calculating module 100 includes:
the preprocessing unit is used for preprocessing the collected three-phase load current signals;
An effective value calculation unit for calculating a current effective value based on the three-phase load current signal after the preprocessing;
and the effective value comparison unit is used for comparing a plurality of current effective values and selecting the largest current effective value as the largest load current effective value.
In one embodiment, the comparison operation module 200 further includes:
an upper and lower threshold setting unit for setting an upper limit threshold and a lower limit threshold in the hysteresis comparator;
a reference threshold setting unit configured to set a load current reference threshold setting value in a threshold range of the upper limit threshold and the lower limit threshold;
a difference value calculating unit for calculating a difference value between a load current reference threshold value set value and the lower limit threshold value;
a sum value calculation unit for calculating a sum value of the load current reference threshold value set value and the upper limit threshold value;
and the judging unit is used for judging whether the maximum load current effective value is smaller than the difference value or not and judging whether the maximum load current effective value is larger than the sum value or not, and obtaining a judging result, wherein the judging result is the comparison operation result.
In one embodiment, the operation determining module 300 includes:
The standby control unit is used for controlling the APF device to enter a standby state if the maximum load current effective value is smaller than the difference value;
and the starting judging unit is used for judging that the operation can be started if the maximum load current effective value is larger than the sum value.
In one embodiment, the maximum distortion module 400 includes:
the waveform data acquisition unit is used for acquiring voltage waveform data of each phase based on the acquired voltage signals of the power grid;
the data analysis unit is used for analyzing the voltage waveform data to obtain each order of harmonic components;
the distortion rate calculation unit is used for calculating the total voltage harmonic distortion rate based on the harmonic components of each order;
the distortion ratio comparison unit is used for comparing the calculated voltage total harmonic distortion ratios of all phases with each other to obtain the maximum power grid voltage total harmonic distortion ratio;
in one embodiment, the treatment opening module 500 includes:
and the corresponding starting unit is used for starting the corresponding APF device according to the phase where the maximum power grid voltage total harmonic distortion rate is located when the maximum power grid voltage total harmonic distortion rate is higher than the voltage total harmonic distortion setting threshold value.
In one embodiment, the current control module 600 includes:
the distortion judging unit is used for judging whether the current maximum grid voltage total harmonic distortion rate is smaller than an expected set value;
and the stopping and increasing unit is used for controlling the output current of the APF device to stop continuously increasing if the output current is smaller than a preset value.
Referring to fig. 3, a computer device is further provided in the embodiment of the present application, where the computer device may be a server, and the internal structure of the computer device may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the computer is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing the use data and the like in the process of the harmonic treatment method based on the APF device. The network interface of the computer device is used for communicating with an external terminal through a network connection. Further, the above-mentioned computer apparatus may be further provided with an input device, a display screen, and the like. The above computer program, when executed by a processor, implements a harmonic treatment method based on an APF device, comprising the steps of: calculating a maximum load current effective value based on the detected three-phase load current signal; comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result; judging whether the current APF device can be started to operate or not based on the comparison operation result; if the operation can be started, detecting the total harmonic distortion rate of the power grid voltage, and obtaining the maximum total harmonic distortion rate of the power grid voltage; when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, controlling the APF device to start harmonic treatment; and controlling the current of the APF device in the harmonic treatment process.
Those skilled in the art will appreciate that the architecture shown in fig. 3 is merely a block diagram of a portion of the architecture in connection with the present application and is not intended to limit the computer device to which the present application is applied.
An embodiment of the present application further provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, implements a harmonic remediation method based on an APF device, including the steps of: calculating a maximum load current effective value based on the detected three-phase load current signal; comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result; judging whether the current APF device can be started to operate or not based on the comparison operation result; if the operation can be started, detecting the total harmonic distortion rate of the power grid voltage, and obtaining the maximum total harmonic distortion rate of the power grid voltage; when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, controlling the APF device to start harmonic treatment; and controlling the current of the APF device in the harmonic treatment process.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided herein and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method 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, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article or method that comprises the element.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (8)
1. A method of harmonic remediation based on an APF device, the method comprising:
calculating a maximum load current effective value based on the detected three-phase load current signal;
comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result;
Judging whether the current APF device can be started to operate or not based on the comparison operation result;
if the operation can be started, detecting the total harmonic distortion rate of the power grid voltage, and obtaining the maximum total harmonic distortion rate of the power grid voltage;
when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, controlling the APF device to start harmonic treatment;
carrying out current control on the APF device in the harmonic treatment process;
comparing the maximum load current effective value with a numerical value in a hysteresis comparator, and obtaining a comparison operation result, wherein the method comprises the following steps of:
setting an upper limit threshold and a lower limit threshold in a hysteresis comparator;
setting a load current reference threshold setting value between threshold ranges of the upper limit threshold and the lower limit threshold;
calculating the difference value between the load current reference threshold value set value and the lower limit threshold value;
calculating the sum of the load current reference threshold set value and the upper limit threshold;
judging whether the maximum load current effective value is smaller than the difference value or not and judging whether the maximum load current effective value is larger than the sum value or not, and acquiring a judging result, wherein the judging result is the comparison operation result;
The step of judging whether the current APF device can be started to operate based on the comparison operation result comprises the following steps:
if the maximum load current effective value is smaller than the difference value, controlling the APF device to enter a standby state;
and if the maximum load current effective value is larger than the sum value, judging that the operation can be started.
2. The APF device-based harmonic remediation method of claim 1, wherein the step of calculating a maximum load current effective value based on the detected three-phase load current signal comprises:
preprocessing the collected three-phase load current signals;
calculating a current effective value based on the preprocessed three-phase load current signal;
and comparing the current effective values, and selecting the largest current effective value as the largest load current effective value.
3. The APF device-based harmonic remediation method of claim 1, wherein the step of detecting the total harmonic distortion of the grid voltage and obtaining the maximum total harmonic distortion of the grid voltage if the APF device can be started to operate comprises:
acquiring voltage waveform data of each phase based on the acquired voltage signals of the power grid;
Analyzing the voltage waveform data to obtain each order of harmonic components;
calculating the total harmonic distortion rate of the voltage based on the harmonic components of each order;
and comparing the calculated voltage total harmonic distortion rates of all phases with each other to obtain the maximum grid voltage total harmonic distortion rate.
4. The APF device-based harmonic remediation method of claim 1, wherein when the maximum grid voltage total harmonic distortion is higher than a voltage total harmonic distortion set threshold, the step of controlling the APF device to turn on harmonic remediation comprises:
and when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold, starting a corresponding APF device according to the phase where the maximum power grid voltage total harmonic distortion rate is located.
5. The APF device-based harmonic remediation method of claim 1, wherein the step of current controlling the APF device in the harmonic remediation process comprises:
judging whether the current maximum grid voltage total harmonic distortion rate is smaller than an expected set value or not;
and if the output current is smaller than the expected set value, controlling the output current of the APF device to stop increasing continuously.
6. A harmonic remediation device based on an APF device for performing the method of any one of claims 1 to 5, the device comprising:
the effective value calculating module is used for calculating the maximum load current effective value based on the detected three-phase load current signals;
the comparison operation module is used for comparing the maximum load current effective value with the numerical value in the hysteresis comparator and obtaining a comparison operation result;
the operation judging module is used for judging whether the current APF device can be started to operate or not based on the comparison operation result;
the maximum distortion module is used for detecting the total harmonic distortion rate of the power grid voltage if the operation can be started, and obtaining the maximum total harmonic distortion rate of the power grid voltage;
the treatment starting module is used for starting when the maximum power grid voltage total harmonic distortion rate is higher than a voltage total harmonic distortion setting threshold value, and controlling the APF device to start harmonic treatment;
and the current control module is used for controlling the current of the APF device in the harmonic treatment process.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 5.
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