CN112491062B - Reactive power compensation method and reactive compensation intelligent monitoring system - Google Patents
Reactive power compensation method and reactive compensation intelligent monitoring system Download PDFInfo
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- CN112491062B CN112491062B CN202011444872.9A CN202011444872A CN112491062B CN 112491062 B CN112491062 B CN 112491062B CN 202011444872 A CN202011444872 A CN 202011444872A CN 112491062 B CN112491062 B CN 112491062B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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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Abstract
The utility model relates to a reactive power compensation method and a reactive compensation intelligent monitoring system, wherein the method comprises the steps of obtaining the active power and the reactive power of the associated line on the phase according to the set frequency; acquiring the working state information of a capacitor associated with a line which needs to be subjected to reactive power compensation or existing compensation adjustment; issuing cut-in working signal information to a group of control devices of capacitors in a non-cut-in state, acquiring active power factor value information of the circuit, and recording the active power factor value information as second active power factor value information; and comparing the second active power factor value information with the set range information, and when the second active power factor value information is out of the set range information, continuing to send switching-in working signal information to the control device of the capacitor in the non-switching-in state until the second active power factor value information is in the set range information. The compensation mode of controlling the reactive power by using the dynamic adjustment mode is favorable for improving the utilization rate of the power supply.
Description
Technical Field
The application relates to the technical field of power grid pollution treatment, in particular to a reactive power compensation method and a reactive compensation intelligent monitoring system.
Background
In the process of using electric equipment in an electric power system, inductive reactive power is generated, and the capacity use efficiency of a power supply is reduced due to the phenomenon, so that the inductive property needs to be neutralized by properly adding a capacitor.
Disclosure of Invention
The application provides a reactive power compensation method and a reactive power compensation intelligent monitoring system, which use a dynamic adjustment mode to control a reactive power compensation mode and are beneficial to improving the utilization rate of a power supply.
In a first aspect, the present application provides a reactive power compensation method, including:
acquiring active power and reactive power of related lines on a phase according to a set frequency;
calculating active power factor value information of each line according to the active power and the reactive power, wherein the active power factor value = active power/(active power + reactive power), and is recorded as first active power factor value information;
comparing the first active power factor value information with the set range information, and when the first active power factor value information is out of the set range information, performing reactive power compensation on the line or adjusting the existing compensation;
acquiring working state information of a capacitor associated with a line which needs to be subjected to reactive power compensation or existing compensation adjustment, wherein the working state comprises an input state and an output state;
issuing cut-in working signal information to a group of control devices of capacitors in a non-cut-in state, acquiring active power factor value information of the circuit, and recording the active power factor value information as second active power factor value information;
comparing the second active power factor value information with the set range information; and
when the second active power factor value information is outside the set range information, continuing to send switching-in working signal information to the control device of the capacitor in the non-switching-in state until the second active power factor value information is within the set range information;
and when the value of the second active power factor value information is larger than the value of the difference value information of the set range information, and the difference value is within an allowable range, stopping compensating the line.
Through adopting above-mentioned technical scheme, can carry out dynamic adjustment to the heterogeneous of same circuit, help improving the active power on this circuit, and then improve the utilization ratio of power.
In one possible implementation manner of the first aspect, when a plurality of sets of capacitors need to be input, the input amount is one set each time.
By adopting the technical scheme, the stability of adjustment is improved, and the influence of adjustment fluctuation on the adjustment is reduced.
In a possible implementation manner of the first aspect, the method further includes, for the capacitor in the on state:
acquiring temperature information of the capacitor according to a set frequency;
comparing the temperature information with first temperature threshold information; and
when the temperature information is larger than the first temperature threshold value information, issuing switching-in working signal information to a control device of a capacitor which is in the same line with the capacitor and is in a non-switching-in state; and
and issuing the switching-out working signal information to a control device of the capacitor with the temperature information larger than the first temperature threshold value information.
By adopting the technical scheme, the capacitor with abnormal temperature can be cut out and cut into a capacitor with normal temperature, and the stability of compensation is improved.
In a possible implementation form of the first aspect, the hand-in working signal information precedes the hand-out working signal information in a time sequence.
By adopting the technical scheme, the fluctuation of adjustment is reduced, and the adjustment safety is improved.
In a possible implementation manner of the first aspect, the method further includes:
after the cut-in working signal information is issued, the fluctuation amplitude information of the active power factor value information of the corresponding line is calculated; and
and when the fluctuation amplitude information is smaller than the fluctuation amplitude threshold information, issuing the switching-out working signal information.
By adopting the technical scheme, the stability of adjustment is further improved.
In a possible implementation manner of the first aspect, the method further includes:
acquiring temperature information of the capacitor according to a set frequency;
comparing the temperature information with second temperature threshold information; and
when the temperature information is greater than the second temperature threshold value information, issuing starting signal information or power increasing signal information to the heat dissipation equipment;
and the numerical value of the second temperature threshold information is smaller than the numerical value of the first temperature threshold information.
Through adopting above-mentioned technical scheme, use the mode of interveneeing in advance at the in-process that the temperature rises and reduce the temperature of condenser, make the condenser can steady operation, help improving the stability of adjustment.
In a possible implementation manner of the first aspect, the method further includes:
acquiring temperature information of the capacitor according to a set frequency;
calculating the temperature rise speed information of the capacitor according to the acquired temperature information;
when the temperature rise speed information is larger than the temperature rise speed threshold value information, issuing starting signal information or power increase signal information to the heat dissipation equipment, and simultaneously issuing switching-in working signal information to a control device of a capacitor which is in the same line with the capacitor and is in a non-switching-in state; and
the switching operation signal information is issued to a control device of the capacitor whose temperature rise rate information is larger than the temperature rise rate threshold value information.
By adopting the technical scheme, the capacitor with abnormal temperature rise speed can be directly cut out, and the adjustment fluctuation caused by the abnormal capacitor can be avoided to a certain extent.
In a possible implementation manner of the first aspect, the method further includes:
acquiring capacitance value information of the capacitor according to a set frequency;
comparing the acquired capacity value information with capacity value threshold value information;
and when the capacitance value information is smaller than the capacitance value threshold value information, issuing switching-in working signal information to a control device corresponding to the capacitor, and simultaneously issuing switching-in working signal information to a control device of the capacitor which is not in a switching-in state.
By adopting the technical scheme, the capacitor with attenuated performance can be cut out, and the stability of reactive power compensation is improved.
In a second aspect, the present application provides a reactive power compensation device, comprising:
the first obtaining unit is used for obtaining active power and reactive power of the phase-related line according to a set frequency;
the first processing unit is used for calculating the active power factor value information of each line according to the active power and the reactive power, and the active power factor value = active power/(active power + reactive power) and is recorded as first active power factor value information;
the second processing unit is used for comparing the first active power factor value information with the set range information, and when the first active power factor value information is positioned outside the set range information, performing reactive power compensation on the line or adjusting the existing compensation;
the second acquisition unit is used for acquiring the working state information of the capacitor associated with the line which needs to perform reactive power compensation or adjust the existing compensation, wherein the working state comprises an input state and a non-input state;
the first communication unit is used for issuing switching-in working signal information to a group of control devices in a capacitor not in a switching-in state, acquiring active power factor value information of the circuit and recording the active power factor value information as second active power factor value information;
the third processing unit is used for comparing the second active power factor value information with the set range information; and
and the fourth processing unit is used for continuously issuing switching-in working signal information to the control device of the capacitor in the non-switching-in state until the second active power factor value information is within the set range information when the second active power factor value information is outside the set range information.
In a third aspect, the present application provides a reactive compensation intelligent monitoring system, the system includes:
one or more memories for storing instructions; and
one or more processors configured to retrieve and execute the instructions from the memory, and perform the reactive power compensation method according to the first aspect and any possible implementation manner of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium comprising:
a program which, when executed by a processor, performs a reactive power compensation method as described in the first aspect and any possible implementation manner of the first aspect.
In a fifth aspect, the present application provides a computer program product comprising program instructions that, when executed by a computing device, perform a reactive power compensation method as described in the first aspect and any possible implementation manner of the first aspect.
In a sixth aspect, the present application provides a system on a chip comprising a processor configured to perform the functions recited in the above aspects, such as generating, receiving, sending, or processing data and/or information recited in the above methods.
The chip system may be formed by a chip, or may include a chip and other discrete devices.
In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data. The processor and the memory may be decoupled, disposed on different devices, connected in a wired or wireless manner, or coupled on the same device.
Drawings
Fig. 1 is a schematic flowchart of a compensation method according to an embodiment of the present application.
Detailed Description
The technical solution of the present application will be described in further detail below with reference to the accompanying drawings.
For example, if the motor is operated, firstly an electromagnetic field is established, and the motor can only rotate, so that most of the electric energy input into the motor is converted into mechanical energy and output from the shaft end, and a small part of the electric energy accounts for about 20% and is used for establishing the electromagnetic field. This fraction is used to build up the electric energy of the electromagnetic field without being converted into other energy, that is to say without being consumed. It simply passes through the motor and returns to the power supply (transformer), and this small portion of the electrical energy that is not consumed is called reactive power, while the electrical energy converted into mechanical energy is called active power.
In addition, the current power supply mostly adopts three-phase power, and for each item of the power supply, when the power supply is within a range, the power supply efficiency is relatively high, and if the power of one phase is obviously higher or lower than that of the other phases, the power supply efficiency is also influenced.
An embodiment of the present application provides a reactive power compensation method, which can adjust each phase of three-phase power to improve power supply efficiency, and please refer to fig. 1, which is a reactive power compensation method disclosed in an embodiment of the present application, and includes the following steps:
s101, acquiring active power and reactive power of a line related to a phase according to a set frequency;
s102, calculating active power factor value information of each line according to active power and reactive power, wherein the active power factor value = active power/(active power + reactive power), and is recorded as first active power factor value information;
s103, comparing the first active power factor value information with the set range information, and when the first active power factor value information is out of the set range information, performing reactive power compensation on the line or adjusting the existing compensation;
s104, acquiring working state information of a capacitor associated with a line which needs to be subjected to reactive power compensation or existing compensation adjustment, wherein the working state comprises an input state and an non-input state;
s105, issuing switching-in working signal information to a group of control devices of the capacitor in the non-switching-in state, acquiring active power factor value information of the circuit, and recording the active power factor value information as second active power factor value information;
s106, comparing the second active power factor value information with the set range information; and
s107, when the second active power factor value information is out of the set range information, continuing to send switching-in working signal information to the control device of the capacitor in the non-switching-in state until the second active power factor value information is in the set range information;
and when the value of the second active power factor value information is larger than the value of the difference value information of the set range information, and the difference value is within an allowable range, stopping compensating the line.
Specifically, in step S101, the active power and the reactive power of the phase-related line are obtained according to the set frequency, and then it is determined whether reactive power compensation is required for the phase power according to the active power.
It should be understood that in an actual power utilization scenario, active power fluctuates, and reactive power compensation is not required in all cases, so that the active power needs to be obtained according to a certain frequency, and then judgment is performed, and when the active power is within an allowable range, reactive power compensation is not required, because the power of a power supply cannot reach one hundred percent, and a certain amount of loss is allowable and unavoidable.
For the active power on a certain phase of electricity, the product of the voltage value and the current value obtained by measuring using the voltage sensor and the current sensor is understood as the average value of the power in one period, which is the power actually consumed in the circuit, and which is the power consumed by the resistance part in the circuit.
The active power is calculated as follows: p = UI cos ψ;
the reactive power is calculated as follows: p = UI sin ψ;
in the above two formulas, ψ is called power factor, and the smaller the value of ψ, the smaller the value of reactive power, and correspondingly, the larger the value of active power, the higher the utilization rate of power supply.
In step S102, the active power factor value information of each line is calculated according to the active power and the reactive power, and the calculation is to know the ratio of the active power to the total power for determining whether reactive power compensation is needed.
For the information of the active power factor value, the specific calculation method is as follows,
the active power factor value = active power/(active power + reactive power), and the sum of active power and reactive power is called apparent power, and can also be understood as total power, and the active power factor value can be understood as the proportion of active power in total power, and the higher the proportion, the higher the utilization rate of the power supply is.
For convenience of description, the information of the active power factor value of each line calculated according to the active power and the reactive power is recorded as the first active power factor value information.
Next, step S103 is executed, in which the first active power factor value information is compared with the setting range information, and two comparison results are obtained, one is that the first active power factor value information is within the setting range information, and the other is that the first active power factor value information is outside the setting range information.
The first active power factor value information is within the set range information, which indicates that reactive power compensation is not required, and the specific reason is stated in the foregoing, and is not described herein again; when the first active power factor value information is outside the set range information, it indicates that reactive power compensation needs to be performed, and there are two specific compensation methods, that is, performing reactive power compensation on the line or adjusting the existing compensation.
The reactive power compensation of the line shows that the line meets the uncompensated condition before sampling, and the adjustment of the existing compensation shows that the compensation mode of the line cannot meet the requirement at present and needs to be adjusted.
In step S104, for a line that needs reactive power compensation or adjustment of existing compensation, operation state information of a capacitor associated with the line is acquired, and the operation state includes an on state and an off state.
Specifically, before compensation, it is necessary to know the working states of the capacitors associated with the line, such as the number of capacitors and the working states of the capacitors, so as to take appropriate compensation measures.
In step S105, the switching-in operation signal information is sent to a group of control devices in the capacitor not in the switching-in state, and the information of the active power factor value of the line is obtained, that is, the capacitance is added to the circuit, and the reactive power compensation is started.
It should be understood that the ratio of the active power in the circuit to the total power is increased after the capacitance is added, but the increased amount needs to be obtained through calculation, so that the active power factor value information of the circuit needs to be obtained, for convenience of description, the active power factor value information obtained here is referred to as second active power factor value information, and then the result of step S105 is determined according to the second active power factor value information.
The specific determination method is executed in step S106, in which the second active power factor value information is compared with the set range information, and the subsequent operation is selected according to the comparison result.
Two comparison results are available, the first is that the second active power factor value information is within the set range information, at this time, it indicates that the execution of step S105 is effective, and the effect meets the requirement; the second is that the second active power factor value information is out of the setting range information, which shows that the step S105 is executed to have a certain effect, but the capacitance needs to be increased continuously, that is, the step S107 is executed.
In step S107, the on-duty signal information is continuously transmitted to the control device of the capacitor in the off-state until the second active power factor value information is within the setting range information.
It should be understood that, during the process of continuing to put into the capacitor, the second active power factor value information may have a value larger than the difference value information of the set range information, which may be understood as that the adjusting strength is larger, but if the difference value is within the allowable range, the adjustment may also be considered as allowable, and at this time, the compensation on the line may be stopped.
If this occurs, the number of capacitors switched in is redundant, but if one capacitor is reduced, the number of capacitors is insufficient, which results in repeated switching in and out of the capacitors and adversely reduces the compensation effect.
Because the ratio of the active power to the total power fluctuates greatly in the process of repeated switching in and switching out, the load at the back end is in a relatively unstable working environment, the purpose of reactive power compensation is to improve the utilization rate of the power supply, but the load at the back end cannot be affected, and therefore, an allowable coping strategy is adopted for the case that the second active power factor value information is slightly exceeded.
On the whole, the reactive power compensation method shown in the embodiment of the application adopts the same set range information to adjust the multiphase electricity belonging to the unified line, so that the active power on each phase electricity tends to be consistent, and meanwhile, an adaptive adjustment mode is adopted according to the fluctuation of the active power to improve the utilization rate of a power supply and meet the requirement of an actual application scene.
It is understood that harmonic voltages are generated when harmonic currents flow through the line impedance, harmonic currents are the source of harmonics, and harmonic voltages are the product of harmonic currents, both generated at approximately the same time.
For reactive compensation equipment, when harmonic waves are injected into a power grid, overcurrent and overload of a high-voltage capacitor of a transformer substation are easily caused, a capacitor cabinet cannot be normally switched on and off in a harmonic wave occasion, and the harmonic waves of the power grid can be further amplified by the capacitor cabinet in a more serious condition.
Therefore, in the process of switching the capacitor, in addition to the capacitance of the capacitor, the harmonic needs to be taken into account. At present, the methods for detecting harmonics are mostly applied with a frequency selection method with a narrow band filter and a fast fourier decomposition method, specifically, a sampler is connected to a circuit, the amount of harmonics is judged by analyzing a sample, and when the amount exceeds a threshold value, an additional control measure is needed.
In the embodiment of the application, a method for connecting reactors in series is provided, namely, if harmonic waves of a capacitor input into a power grid exceed an allowable range, a reactor is connected in series in an existing circuit, and the reactor and the capacitor work simultaneously to restrain voltage distortion and current distortion of the power grid.
Specifically, before installation or during upgrading and reconstruction, the order and the size of the line or load harmonic can be obtained through data detection or experience or historical data, then a proper reactor is selected to be connected, and when a capacitor is switched in, the reactor connected in series with the capacitor is connected into a circuit.
Meanwhile, the working states of the capacitor and the reactor are also included in a monitoring range, and the capacitance value of the capacitor is obtained by calculating the acquired fundamental voltage and fundamental current of the capacitor end.
The acquisition of the capacitor terminal voltage (operating voltage) is divided into two cases,
first, the capacitor is directly connected to the grid, and the grid voltage is directly read.
And secondly, a capacitor is connected with a reactor in series and then is connected into a power grid, and the running voltage value of the capacitor end can be directly measured by voltage acquisition. The system voltage connected into the series circuit can be obtained by combining the inductance value calculation of the reactor.
And for the inductance value of the reactor, the inductance value is calculated by the fundamental voltage at the inlet and outlet ends of the series reactor and the fundamental current flowing through the reactor.
The purpose of calculating the capacitance value and the inductance value is to judge whether the reactor and the capacitor are damaged, that is, whether the inherent parameters of the equipment are changed or not can be calculated through voltage and current, the change degree is what, if the inherent parameters exceed a certain range, the equipment is considered to be damaged and cannot be used again, and the specific steps are as follows:
s601, acquiring capacitance value information of a capacitor according to a set frequency;
s602, comparing the acquired capacity value information with capacity value threshold value information;
and S603, when the capacity value information is smaller than the capacity value threshold value information, issuing the cut-in working signal information to the control device corresponding to the capacitor, and simultaneously issuing the cut-in working signal information to the control device of the capacitor which is not in the input state.
On the whole, the capacitance with partially attenuated performance can be cut out from the circuit by judging the capacitance value of the capacitor, so that the stability in reactive power compensation is guaranteed.
It will be appreciated that the performance of the capacitor is degraded after attenuation, i.e. the actual compensation is lower than the required compensation, which results in a situation where the compensation is not in place, and if the part of the attenuated capacitor can be automatically replaced, the normal operation of reactive power compensation can be ensured.
At this moment, need send out the police dispatch newspaper, remind the staff to maintain or change, specifically speaking, can number condenser and reactor, to certain individual of damaging, can directly show the serial number on the display, make things convenient for the staff to maintain or change.
As a specific implementation of the reactive power compensation method provided by the application, when a plurality of sets of capacitors need to be input, the input amount is one set each time, that is, if there is a case that a plurality of sets of capacitors need to be input, the input is divided into a plurality of times, and the number of times of input is equal to the number of sets of capacitors.
It will be appreciated that it takes time to put in a group of capacitors, from operation to stability, during which time a certain ripple will result, the less capacitors that are put in, the less will be the ripple that will occur, and therefore only one group is put in each time, in order to reduce the ripple that results from increasing the capacitance.
As a specific implementation of the reactive power compensation method provided by the application, for the input capacitor, the content of temperature monitoring is also added, and the specific steps are as follows:
s201, acquiring temperature information of a capacitor according to a set frequency;
s202, comparing the temperature information with first temperature threshold information; and
s203, when the temperature information is larger than the first temperature threshold value information, issuing switching-in working signal information to a control device of the capacitor which is in the same line with the capacitor and is in a non-switching-in state; and
and S204, sending out the switching-out working signal information to the control device of the capacitor with the temperature information larger than the first temperature threshold value information.
Specifically, in step S201, temperature information of the capacitor, that is, temperature values of the capacitor are acquired in time series at a set frequency, and based on the acquired temperature values, the operating temperature of the capacitor can be determined, and an appropriate countermeasure can be taken.
It should be understood that the capacitor generates heat during operation, and in consideration of the heat source existing in the surrounding environment, the temperature of the capacitor may rise, and if the temperature of the capacitor is too high, thermal breakdown may occur or bulging phenomenon may occur, so that it is necessary to observe the temperature of the capacitor in time, and when the temperature of the capacitor is abnormal, a proper countermeasure should be taken in time.
In step S202, the temperature of the capacitor is compared with the first temperature threshold, and when the temperature of the capacitor exceeds the first temperature threshold, step S203 is executed, in which a capacitor in an on state is switched in, specifically, switching-in operation signal information is issued to a control device of the capacitor in an off state on the same line as the capacitor, and switching-out operation signal information is issued to a control device of the capacitor whose temperature information is greater than the first temperature threshold information, and the switching-in operation signal information and the switching-out operation signal information may be issued simultaneously or in a staggered manner.
On the whole, the content in steps S201 to S204 is to adjust the capacitor according to the temperature of the capacitor, so that the capacitor with abnormal temperature can be switched from the working state to the non-working filling in time, and the safety accidents such as thermal breakdown or bulging caused by the continuous rise of the temperature are avoided.
Further, the cut-in operation signal information is located before the cut-out operation signal information in time series, that is, it is necessary to first cut in one capacitor and then cut out the capacitor with abnormal temperature.
It will be appreciated that as the temperature of the capacitor increases, the performance of the capacitor decreases, and then a capacitor is switched in to compensate for the decreased performance, and then the capacitor with abnormal temperature is switched out to help reduce the fluctuation caused by switching in and switching out.
Further, for the time for issuing the switching-out working signal, the following judgment modes are added:
s301, after the cut-in working signal information is issued, the fluctuation amplitude information of the active power factor value information of the corresponding line is calculated; and
s302, when the fluctuation amplitude information is smaller than the fluctuation amplitude threshold information, the switching-out working signal information is sent down.
Specifically, after the cut-in working signal information is issued, the fluctuation amplitude of the active power is calculated, and when the fluctuation amplitude is within the allowable range, or the fluctuation amplitude information is smaller than the fluctuation amplitude threshold information, the cut-out working signal information is issued, and for the calculation of the active power, the above description is already made, and is not repeated here.
The purpose of calculating the ripple is to shorten the sending time of the cut-out operation signal information as much as possible, and the purpose is to cut out the capacitor with abnormal temperature from the circuit in the past.
As another specific embodiment of the reactive power compensation method provided by the application, another way is used to control the temperature of the capacitor, and the specific steps are as follows:
s401, acquiring temperature information of a capacitor according to a set frequency;
s402, comparing the temperature information with second temperature threshold information; and
s403, when the temperature information is greater than the second temperature threshold value information, issuing starting signal information or power increasing signal information to the heat dissipation equipment;
and the numerical value of the second temperature threshold information is smaller than the numerical value of the first temperature threshold information.
Specifically, a second temperature threshold is added as a reference, the second temperature threshold is smaller than the first temperature threshold, when the temperature of the capacitor reaches the second temperature threshold, an active cooling measure is adopted to control the temperature, for example, sending a start signal message to the heat sink or increasing the power of the heat sink, because the temperature rise of the capacitor is likely to be the influence of the surrounding environment, the temperature of the capacitor is reduced in an active cooling manner.
It should be noted, however, that if the active cooling is used, the temperature of the capacitor is still rising, and then the cut-out control strategy is used when the temperature reaches the first temperature threshold.
As a specific embodiment of the reactive power compensation method, the operating state of the capacitor is determined by using the temperature rise rate, which is specifically as follows:
s501, acquiring temperature information of the capacitor according to a set frequency;
s502, calculating the temperature rise speed information of the capacitor according to the acquired temperature information;
s503, when the temperature rise speed information is larger than the temperature rise speed threshold value information, issuing starting signal information or power increase signal information to the heat dissipation equipment, and simultaneously issuing switching-in working signal information to a control device of a capacitor which is in the same line with the capacitor and is in a non-switching-in state; and
s504, the switching operation signal information is issued to the control device of the capacitor whose temperature rise rate information is larger than the temperature rise rate threshold value information.
Specifically, the operating state of the capacitor is determined according to the temperature rising speed, and it should be understood that, in the case of normal operation of the capacitor, the temperature of the capacitor is in a relatively stable interval, or rises at a slow speed, and a sudden temperature increase rarely occurs, so that for such an abnormal situation with a sudden temperature increase, a control strategy of actively cooling and switching the capacitor needs to be used, and active control is firstly performed, and then the reason is searched.
Furthermore, a set of alarm device can be added, for example, all the capacitor cabinets are numbered, and when one of the capacitor cabinets uses the control strategy of actively cooling and switching the capacitors, an alarm is given out based on the number of the capacitor cabinet to remind the operation and maintenance personnel of coming inspection.
The embodiment of the present application further provides a reactive power compensation device, including:
the first obtaining unit is used for obtaining active power and reactive power of the phase-related line according to a set frequency;
the first processing unit is used for calculating the active power factor value information of each line according to the active power and the reactive power, and the active power factor value = active power/(active power + reactive power) and is recorded as first active power factor value information;
the second processing unit is used for comparing the first active power factor value information with the set range information, and when the first active power factor value information is positioned outside the set range information, performing reactive power compensation on the line or adjusting the existing compensation;
the second acquisition unit is used for acquiring the working state information of the capacitor associated with the line which needs to perform reactive power compensation or adjust the existing compensation, wherein the working state comprises an input state and a non-input state;
the first communication unit is used for issuing switching-in working signal information to a group of control devices in a capacitor not in a switching-in state, acquiring active power factor value information of the circuit and recording the active power factor value information as second active power factor value information;
the third processing unit is used for comparing the second active power factor value information with the set range information; and
and the fourth processing unit is used for continuously issuing switching-in working signal information to the control device of the capacitor in the non-switching-in state until the second active power factor value information is within the set range information when the second active power factor value information is outside the set range information.
In one example, the units in any of the above apparatuses may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), or a combination of at least two of these integrated circuit forms.
As another example, when a unit in a device may be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of invoking programs. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).
Various objects such as various messages/information/devices/network elements/systems/devices/actions/operations/procedures/concepts may be named in the present application, it is to be understood that these specific names do not constitute limitations on related objects, and the named names may vary according to circumstances, contexts, or usage habits, and the understanding of the technical meaning of the technical terms in the present application should be mainly determined by the functions and technical effects embodied/performed in the technical solutions.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It should also be understood that, in various embodiments of the present application, first, second, etc. are used merely to indicate that a plurality of objects are different. For example, the first time window and the second time window are merely to show different time windows. And should not have any influence on the time window itself, and the above-mentioned first, second, etc. should not impose any limitation on the embodiments of the present application.
It is also to be understood that the terminology and/or the description of the various embodiments herein is consistent and mutually inconsistent if no specific statement or logic conflicts exists, and that the technical features of the various embodiments may be combined to form new embodiments based on their inherent logical relationships.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a computer-readable storage medium, which includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned computer-readable storage media comprise: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiment of the application still provides a reactive compensation wisdom monitoring system, the system includes:
one or more memories for storing instructions; and
one or more processors configured to retrieve and execute the instructions from the memory to perform the reactive power compensation method as described above.
Embodiments of the present application also provide a computer program product, which includes instructions that, when executed, cause the reactive compensation intelligent monitoring system to perform operations of the reactive compensation intelligent monitoring system corresponding to the above method.
Embodiments of the present application further provide a chip system, which includes a processor, and is configured to implement the functions referred to in the foregoing, for example, to generate, receive, transmit, or process data and/or information referred to in the foregoing methods.
The chip system may be formed by a chip, or may include a chip and other discrete devices.
The processor mentioned in any of the above may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the method for transmitting feedback information.
In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data. The processor and the memory may be decoupled, respectively disposed on different devices, and connected in a wired or wireless manner to support the chip system to implement various functions in the above embodiments. Alternatively, the processor and the memory may be coupled to the same device.
Optionally, the computer instructions are stored in a memory.
Alternatively, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the memory may also be a storage unit outside the chip in the terminal, such as a ROM or other types of static storage devices that can store static information and instructions, a RAM, and the like.
It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory.
The non-volatile memory may be ROM, Programmable Read Only Memory (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), or flash memory.
Volatile memory can be RAM, which acts as external cache memory. There are many different types of RAM, such as Static Random Access Memory (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synclink DRAM (SLDRAM), and direct memory bus RAM.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. A reactive power compensation method, comprising:
acquiring active power and reactive power of related lines on a phase according to a set frequency;
calculating active power factor value information of each line according to the active power and the reactive power, wherein the active power factor value = active power/(active power + reactive power), and is recorded as first active power factor value information;
comparing the first active power factor value information with the set range information, and when the first active power factor value information is out of the set range information, performing reactive power compensation on the line or adjusting the existing compensation;
acquiring working state information of a capacitor associated with a line which needs to be subjected to reactive power compensation or existing compensation adjustment, wherein the working state comprises an input state and an output state;
issuing cut-in working signal information to a group of control devices of capacitors in a non-cut-in state, acquiring active power factor value information of the circuit, and recording the active power factor value information as second active power factor value information;
comparing the second active power factor value information with the set range information; and
when the second active power factor value information is out of the set range information, continuing to send switching-in working signal information to the control device of the capacitor in the non-switching-in state, and when a plurality of groups of capacitors need to be switched in, switching-in amount is one group each time until the second active power factor value information is in the set range information;
when the value of the second active power factor value information is larger than the value of the difference value information of the set range information, and the difference value is within an allowable range, stopping compensating the line;
for the capacitor in the on state, the method further comprises the following steps:
acquiring temperature information of the capacitor according to a set frequency;
comparing the temperature information with first temperature threshold information; and
when the temperature information is larger than the first temperature threshold value information, issuing switching-in working signal information to a control device of a capacitor which is in the same line with the capacitor and is in a non-switching-in state; and
issuing switching-out working signal information to a control device of the capacitor with the temperature information being greater than the first temperature threshold information;
comparing the temperature information with second temperature threshold information; and
when the temperature information is greater than the second temperature threshold value information, issuing starting signal information or power increasing signal information to the heat dissipation equipment;
the numerical value of the second temperature threshold information is smaller than the numerical value of the first temperature threshold information;
calculating the temperature rise speed information of the capacitor according to the acquired temperature information;
when the temperature rise speed information is larger than the temperature rise speed threshold value information, issuing starting signal information or power increase signal information to the heat dissipation equipment, and simultaneously issuing switching-in working signal information to a control device of a capacitor which is in the same line with the capacitor and is in a non-switching-in state; and
the switching operation signal information is issued to a control device of the capacitor whose temperature rise rate information is larger than the temperature rise rate threshold value information.
2. A reactive power compensation method according to claim 1, wherein the cut-in working signal information precedes the cut-out working signal information in time series.
3. A reactive power compensation method according to claim 2, further comprising:
after the cut-in working signal information is issued, the fluctuation amplitude information of the active power factor value information of the corresponding line is calculated; and
and when the fluctuation amplitude information is smaller than the fluctuation amplitude threshold information, issuing the switching-out working signal information.
4. A reactive power compensation method according to any one of claims 2 or 3, further comprising:
acquiring capacitance value information of the capacitor according to a set frequency;
comparing the acquired capacity value information with capacity value threshold value information;
and when the capacitance value information is smaller than the capacitance value threshold value information, issuing switching-in working signal information to a control device corresponding to the capacitor, and simultaneously issuing switching-in working signal information to a control device of the capacitor which is not in a switching-in state.
5. A reactive power compensation device based on the reactive power compensation method of any one of claims 1 to 4, comprising:
the first obtaining unit is used for obtaining active power and reactive power of the phase-related line according to a set frequency;
the first processing unit is used for calculating the active power factor value information of each line according to the active power and the reactive power, and the active power factor value = active power/(active power + reactive power) and is recorded as first active power factor value information;
the second processing unit is used for comparing the first active power factor value information with the set range information, and when the first active power factor value information is positioned outside the set range information, performing reactive power compensation on the line or adjusting the existing compensation;
the second acquisition unit is used for acquiring the working state information of the capacitor associated with the line which needs to perform reactive power compensation or adjust the existing compensation, wherein the working state comprises an input state and a non-input state;
the first communication unit is used for issuing switching-in working signal information to a group of control devices in a capacitor not in a switching-in state, acquiring active power factor value information of the circuit and recording the active power factor value information as second active power factor value information;
the third processing unit is used for comparing the second active power factor value information with the set range information; and
and the fourth processing unit is used for continuously issuing switching-in working signal information to the control device of the capacitor in the non-switching-in state until the second active power factor value information is within the set range information when the second active power factor value information is outside the set range information.
6. A reactive compensation wisdom monitoring system, its characterized in that, the system includes:
one or more memories for storing instructions; and
one or more processors configured to retrieve and execute the instructions from the memory, and to perform the reactive power compensation method according to any one of claims 1 to 4.
7. A computer-readable storage medium, the computer-readable storage medium comprising:
program for performing a reactive power compensation method according to any of claims 1 to 4 when said program is run by a processor.
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| CN114295898A (en) * | 2021-12-31 | 2022-04-08 | 胜业电气股份有限公司 | Method and system for detecting capacitance value of capacitor on line and calculating service life of capacitor and storage medium |
| CN116298538B (en) * | 2023-05-17 | 2023-08-22 | 新乡市万新电气有限公司 | On-line monitoring method of intelligent capacitance compensation device |
| CN117856280B (en) * | 2023-12-29 | 2024-09-13 | 浙江锦能电力科技有限公司 | Intelligent power factor compensation method, system and medium thereof |
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