CN114243698B - Capacitance adjusting device, system and method - Google Patents
Capacitance adjusting device, system and method Download PDFInfo
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- CN114243698B CN114243698B CN202111649688.2A CN202111649688A CN114243698B CN 114243698 B CN114243698 B CN 114243698B CN 202111649688 A CN202111649688 A CN 202111649688A CN 114243698 B CN114243698 B CN 114243698B
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Classifications
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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
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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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention provides a capacitance-using adjusting device, a system and a method thereof, which dynamically adjust a capacitance-using adjusting step value based on a fuzzy theory, can reset the capacitance-using adjusting step value according to the current apparent power, and solve the problem that the capacitance-using adjusting step value in the prior art cannot be timely reduced below a threshold value due to the fixed capacitance-using adjusting step value; when the step value is adjusted by the capacitance, the response time of the power load is set as an independent variable, so that the influence of the response time of different power loads on the step time can be compensated.
Description
Technical Field
The invention relates to the technical field of electric power regulation, in particular to a device, a system and a method for regulating electric capacity.
Background
At present, the problem that the capacity of the partial factories exceeds the standard in a short time exists, and the capacity expansion treatment is carried out because of the short time exceeding, so that the power consumption cost of the factories is greatly increased; without processing, a plurality of short time exceeding would be faced with a penalty to the power supply system. Therefore, a product capable of adjusting the electric capacity is needed, and the electric capacity of a factory is controlled within the rated capacity range. However, such products are not available in the market, and the problem that the capacity of the factory exceeds the standard in a short time cannot be solved. Therefore, in order to solve the above problems, the present invention provides a device, a system and a method for adjusting the power consumption capacity, which automatically control the power consumption output of a factory within a rated capacity range, so as to avoid the phenomenon of capacity overload.
Disclosure of Invention
In view of this, the present invention provides a device, a system and a method for adjusting the power consumption capacity, which automatically control the power consumption output of a factory within a rated capacity range, so as to avoid the phenomenon of capacity overload.
The technical scheme of the invention is realized as follows: in one aspect, the invention provides a capacitance-using adjusting device, which comprises a smart meter, a programmable controller, a power regulator and a power load, wherein the smart meter collects voltage and current in real time, calculates apparent power based on the voltage and the current, and transmits the apparent power to the programmable controller in real time through MODBUS-RTU communication;
the power regulator is used for setting a first capacitance threshold and synchronously transmitting the first capacitance threshold to the programmable controller;
the programmable controller compares the apparent power to a first capacitance threshold; when the apparent power exceeds the first capacitance threshold, the programmable controller limits the capacitance of the power load below the first capacitance threshold based on PID regulation theory;
The intelligent ammeter is connected with the programmable controller through a data line, and the power regulator is electrically connected with an analog input end of the programmable controller; the power load is electrically connected with the analog output end of the programmable controller.
In another aspect, the present invention provides a method for adjusting capacitance, comprising the steps of:
S1, building a capacitance adjusting system;
S2, setting a first capacitance threshold through a power regulator, synchronously transmitting the first capacitance threshold to a programmable controller, and transmitting apparent power to the programmable controller in real time by the intelligent ammeter;
and S3, the programmable controller determines power utilization adjustment information of the current power equipment based on the apparent power and the first capacitance threshold, and adjusts the power utilization condition of the power equipment based on the power utilization adjustment information so as to limit the adjusted overall power utilization to be below the first capacitance threshold.
On the basis of the above technical solution, preferably, the determining, by the programmable controller in S3, the power consumption adjustment information of the current power device based on the apparent power and the first capacitance threshold is specifically:
if the apparent power is smaller than the first capacitance threshold, synchronously forwarding the first capacitance threshold set by the power regulator to the power load by the programmable controller;
If the apparent power is greater than the first capacitance threshold, the programmable controller obtains a capacitance adjustment step value based on the fuzzy theory, and repeatedly resets the second capacitance threshold a plurality of times based on the capacitance adjustment step value until the apparent power is limited below the first capacitance threshold.
On the basis of the above technical solution, preferably, the step value for capacitance adjustment obtained by the programmable controller based on the fuzzy theory specifically includes the following steps:
s101, setting the difference value between apparent power and a first capacitance threshold as delta S, and setting three sequentially increased fuzzy values L, M and H; judging the difference value between the apparent power and the first capacitance threshold value and the magnitudes of three fuzzy values;
When DeltaS epsilon (a 1, a 2), deltaS is H, when DeltaS epsilon (a 2, a 3), deltaS is M, when DeltaS epsilon (a 3, a 4), deltaS is L, a1, a2, a3, a4 are constants among (0, 1), and a1 < a2 < a3 < a4, setting the ratio of the difference DeltaS and the corresponding fuzzy value as a scale factor;
S102, setting the response time of the power load as an independent variable, and setting the product of the scale factor and the independent variable as a step value regulated by capacitance.
Based on the above technical solution, it is preferable that the resetting of the second capacitance threshold value based on the capacitance adjustment step value is repeated a plurality of times, specifically:
S201, setting the difference value between the apparent power and the capacitance adjustment stepping value as a second capacitance threshold value;
s202, transmitting a second capacitance threshold value to the power load, and limiting the capacitance of the power load below the second capacitance threshold value based on a PID (proportion integration differentiation) regulation algorithm;
s203, monitoring the apparent power transmitted by the intelligent ammeter, and if the apparent power is smaller than the first capacitance threshold, synchronously forwarding the second capacitance threshold to a power load by the programmable controller;
If the apparent power is greater than the first capacitance threshold, the difference between the last set second capacitance threshold and the step value of capacitance adjustment is set as a new second capacitance threshold, and steps S202-S203 are repeated until the apparent power is limited below the first capacitance threshold.
On the basis of the above technical solution, preferably, the step S203 further includes the following steps after limiting the apparent power below the first capacitance threshold:
S204, setting a third capacitance threshold, wherein the third capacitance threshold is smaller than the first capacitance threshold;
s205, judging whether the current apparent power of the power load is larger than a third capacitance threshold, and if the current apparent power is larger than the third capacitance threshold and smaller than the first capacitance threshold, keeping the latest second capacitance threshold of the power load to operate;
If the current apparent power is smaller than the third capacitance threshold, acquiring a difference value between the current apparent power of the power load and the third capacitance threshold, acquiring a new scale factor and an independent variable by adopting the method described in S101-S102, setting the product of the scale factor and the independent variable as a new capacitance adjustment step value, setting the sum of the current apparent power and the new capacitance adjustment step value as a fourth capacitance threshold, transmitting the fourth capacitance threshold to the power load, and limiting the capacitance of the power load below the fourth capacitance threshold based on a PID (proportion integration differentiation) adjustment algorithm;
S205, monitoring the apparent power transmitted by the intelligent ammeter in real time, and synchronously forwarding a fourth capacitance threshold to a power load by the programmable controller if the apparent power is larger than a third capacitance threshold and smaller than a first capacitance threshold;
If the apparent power is less than the third capacitance threshold, setting a new fourth capacitance threshold by the sum of the last set fourth capacitance threshold and the new step value of capacitance adjustment, and repeating step S205 until the apparent power is limited between the third capacitance threshold and the first capacitance threshold.
In the above aspect, preferably, when the new fourth capacitance threshold is greater than the first capacitance threshold, the value of the first capacitance threshold is assigned to the fourth capacitance threshold.
The invention also provides a capacitance adjusting system, which comprises a first comparison unit, a first stepping value setting unit, a second comparison unit and a second stepping value setting unit;
The first comparison unit obtains apparent power transmitted by the intelligent ammeter and a first capacitance threshold value set by the power regulator, and compares the apparent power and the first capacitance threshold value; when the apparent power is less than the first capacitance threshold, the power load operates in a first capacitance threshold mode; otherwise, the difference value of the two is transmitted to a first stepping value setting unit;
The first step value setting unit sets the capacitance adjustment step value by the method of any one of claims 2 to 7, and repeatedly adjusts the apparent power of the power load a plurality of times based on the capacitance adjustment step value until the apparent power of the power load is limited below the first capacitance threshold;
the second comparison unit obtains apparent power of the power load, compares the apparent power with a preset third capacitance threshold, and operates in a second capacitance threshold mode when the apparent power is larger than the third capacitance threshold; otherwise, the difference value of the two is transmitted to a second stepping value setting unit;
The second step value setting unit sets the capacitance adjustment step value by the method of any one of claims 2 to 7, and repeatedly adjusts the apparent power of the power load a plurality of times based on the capacitance adjustment step value until the apparent power of the power load is limited below the third capacitance threshold;
The input end of the first comparison unit is electrically connected with the output ends of the intelligent ammeter and the power regulator respectively, the output end of the first comparison unit is electrically connected with the power load and the input end of the first step value setting unit respectively, and the output end of the first step value setting unit is electrically connected with the power load; the input end of the second comparison unit is electrically connected with the power load, and the output end of the second comparison unit is electrically connected with the power load through the second stepping value setting unit.
Compared with the prior art, the capacitance adjusting device, the capacitance adjusting system and the capacitance adjusting method have the following beneficial effects:
(1) The programmable controller dynamically adjusts the actual capacitance of the power load based on the apparent power transmitted by the intelligent ammeter and the first capacitance threshold set by the power regulator, reduces the frequency of exceeding the standard of the short-time capacitance of the power load, and can quickly adjust the exceeding capacitance below the first capacitance threshold;
(2) The capacitance adjustment stepping value can be reset according to the current apparent power, so that the problem that the capacitance for a short time cannot be reduced below a threshold value in time due to the fact that the capacitance adjustment stepping value is fixed in the prior art is solved;
(3) When the step value is adjusted by using the capacitance, the response time of the power load is set as an independent variable, so that the influence of the response time of different power loads on the step time can be compensated;
(4) The power load power consumption is raised by setting a new power consumption adjustment stepping value and setting the sum of the current apparent power and the new power consumption adjustment stepping value as a fourth power consumption threshold value, so that the problem that the power load is in a power failure state or a low-power operation state due to the fact that the second power consumption threshold value is lowered for a plurality of times is solved, and the balance of the circuit is maintained.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a capacitance adjusting device according to the present invention;
FIG. 2 is a block diagram of a capacitance adjustment system according to the present invention;
FIG. 3 is a flow chart of a method for capacitance adjustment according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
As shown in fig. 1, a capacitance adjustment system of the present invention includes a smart meter, a programmable controller, a power regulator, and a power load.
The intelligent ammeter is arranged in the factory metering cabinet, collects total current and voltage, calculates apparent power of the factory according to the collected current and voltage, transmits the apparent power to the programmable controller in real time through MODBUS-RTU communication, and the programmable controller adopts Ethernet communication to transmit data to the touch screen for display and recording. The intelligent ammeter is connected with the programmable controller through a data line. The present embodiment does not relate to structural improvement of the smart meter, and here, the structure and the working principle of the smart meter are not described any more, and other devices or schemes may be adopted to obtain apparent power of the factory in the present embodiment.
And the power regulator is used for regulating the power of the power load and limiting the overload electric power of the power load. The power regulator is directly connected with the power load, the first capacitance threshold value provided by the power regulator is a fixed value and cannot be dynamically adjusted according to the state of the line, but the problem that the capacitance exceeds the standard in a short time can be generated along with the increase of the number of the line access loads and unbalance of the line, and the power cost of a factory can be greatly increased when the capacity expansion treatment is carried out; if the power supply system is not processed, the fine of the power supply system is faced when the short time exceeds the standard for many times. Therefore, in order to solve this problem, in this embodiment, the power regulator is connected to the power load through a programmable controller, and the programmable controller dynamically adjusts the first capacitance threshold set by the power regulator according to the real-time apparent power collected by the smart meter, and controls the capacitance of the power load to be less than the first capacitance threshold based on the PID adjustment theory. In this way, the frequency of the short-time capacity exceeding of the power load can be reduced, and the capacity exceeding can be quickly adjusted below the first capacity threshold.
And the programmable controller receives the apparent power transmitted by the intelligent ammeter, dynamically adjusts the actual power consumption of the power load based on the apparent power and the first capacitance threshold set by the power regulator, and can control the power output of a factory within the rated capacity range so as to realize full-automatic control.
The power load may be any one or a combination of a plurality of inductive load, resistive load and capacitive load.
The working principle of the embodiment is as follows: the power regulator sets a first capacitance threshold, transmits the first capacitance threshold to the programmable controller, receives apparent power transmitted by the intelligent ammeter, compares the apparent power with the first capacitance threshold, synchronously forwards the first capacitance threshold to the power load when the apparent power is smaller than the first capacitance threshold, and limits the capacitance of the power load below the first capacitance threshold based on a PID regulation theory; when the apparent power is larger than the first capacitance threshold, the programmable controller rapidly reduces the first capacitance threshold, sets the reduced first capacitance threshold as a second capacitance threshold, transmits the second capacitance threshold to the power load, compares the current apparent power with the first capacitance threshold again, reduces the second capacitance threshold again if the current apparent power is still larger than the first capacitance threshold, transmits the reduced second capacitance threshold to the power load, and circularly detects until the current apparent power is smaller than the first capacitance threshold.
The beneficial effects of this embodiment are: the programmable controller dynamically adjusts the actual capacitance of the power load based on the apparent power transmitted by the intelligent ammeter and the first capacitance threshold set by the power regulator, reduces the frequency of short-time exceeding of the capacitance of the power load, and can quickly adjust the exceeding capacitance below the first capacitance threshold.
Example 2
On the basis of embodiment 1, this embodiment provides a capacitance adjustment method, as shown in fig. 3, specifically including the following steps:
s1, constructing a capacitance adjustment system of the embodiment 1;
S2, setting a first capacitance threshold through a power regulator, synchronously transmitting the first capacitance threshold to a programmable controller, and transmitting apparent power to the programmable controller in real time by the intelligent ammeter;
and S3, the programmable controller determines power utilization adjustment information of the current power equipment based on the apparent power and the first capacitance threshold, and adjusts the power utilization condition of the power equipment based on the power utilization adjustment information so as to limit the adjusted overall power utilization to be below the first capacitance threshold.
Preferably, determining the power consumption adjustment information of the current power device based on the apparent power and the first capacitance threshold is specifically: if the apparent power is smaller than the first capacitance threshold, synchronously forwarding the first capacitance threshold set by the power regulator to the power load by the programmable controller; if the apparent power is greater than the first capacitance threshold, the programmable controller obtains a capacitance adjustment step value based on the fuzzy theory, and repeatedly resets the second capacitance threshold a plurality of times based on the capacitance adjustment step value until the apparent power is limited below the first capacitance threshold.
Preferably, the actual capacitance of the power load is adjusted repeatedly, so that the short-time exceeding capacitance of the factory is quickly reduced below the threshold value, and the occurrence frequency of the short-time exceeding condition is avoided. Therefore, it is important to adjust the step value by using the capacitance, if the step value by using the capacitance is too small, the step value by using the capacitance needs to be adjusted many times, a longer adjustment time is needed, and the capacitance for a short time cannot be reduced below the threshold value in time, so that the problem of the embodiment cannot be solved; if the step value is set too large, although the adjustment times can be reduced, the power load is powered down or in a low-power running state, the working benefit of the power load is affected, and a large potential safety hazard exists. Therefore, how to set the appropriate step value for capacitance adjustment is a difficulty of the present embodiment. Existing power step value settings often use either a 10% step mode or a 1% mode, i.e., step by 10% or 1% of the total power at a time. The stepping mode can only step according to the mode once being set, but the electricity consumption condition on the factory line changes rapidly and has various kinds, and in this mode, the proper stepping value cannot be set obviously without being matched with the actual electricity consumption condition of the factory line, or the problem of the embodiment cannot be solved. Based on the above conditions, the present embodiment provides a method for dynamically adjusting a step value based on a fuzzy theory. Specifically, the step value for capacitance adjustment based on the fuzzy theory comprises the following steps:
s101, setting the difference value between apparent power and a first capacitance threshold as delta S, and setting three sequentially increased fuzzy values L, M and H; judging the difference value between the apparent power and the first capacitance threshold value and the magnitudes of three fuzzy values;
When the delta S epsilon (a 1, a 2), the corresponding fuzzy value of the delta S is H, when the delta S epsilon (a 2, a 3), the corresponding fuzzy value of the delta S is M, when the delta S epsilon (a 3, a 4), the corresponding fuzzy value of the delta S is L, a1, a2, a3 and a4 are constants among (0, 1), and a1 < a2 < a3 < a4, and the ratio of the difference delta S to the corresponding fuzzy value is set as a scale factor;
In this embodiment, the first capacitance threshold is set to 95% of the maximum electric power, a1, a2, a3, a4 are sequentially set to 0.2, 0.4, 0.6 and 0.8, l, M and H are respectively set to 10, 15 and 20, the current apparent power is set to 98% of the maximum electric power, the difference between the current apparent power and the first capacitance threshold is 3% of the maximum electric power, and the difference belongs to (a 1, a 2), i.e., the fuzzy value corresponding to Δs is 20, and the scale factor is the ratio of 3% to 20 of the maximum electric power.
S102, setting an independent variable based on the response time of the power load, and setting the product of the proportional factor and the independent variable as a step value regulated by capacitance.
Because the response time of each load is different, even if a proper step value of capacitance adjustment is set, the capacitance for a short time cannot be quickly reduced below the threshold value due to the factor of the response time. Therefore, the response time of the power load is introduced in the embodiment, when the power load is taken as an intermediate frequency furnace, the response time is 20ms, the product of the scaling factor obtained in the step S101 and the response time is 3% of the maximum electric power, namely, the step value of the power consumption is adjusted to be 3% of the maximum electric power.
Preferably, the resetting of the second capacitance value based on the capacitance adjustment step value is repeated a plurality of times, specifically includes the steps of:
S201, setting the difference value between the apparent power and the capacitance adjustment stepping value as a second capacitance threshold value;
s202, transmitting a second capacitance threshold value to the power load, and limiting the capacitance of the power load below the second capacitance threshold value based on a PID (proportion integration differentiation) regulation algorithm;
As is clear from the above, the calculated step value of the electric capacity adjustment according to the present embodiment is 6% of the maximum electric power, and the second electric capacity threshold value is the difference between 98% of the maximum electric power and 3% of the maximum electric power, that is, the second electric capacity threshold value is 95% of the maximum electric power, and the programmable controller transmits the second electric capacity threshold value to the power load and controls the power load to operate in a mode of 95% of the maximum electric power based on the PID adjustment algorithm. And adjusting the second capacitance threshold, namely adjusting the P value in the PID regulation algorithm, obtaining the I value of the PID regulation algorithm according to the P value, and adjusting the power load by combining with the PI.
S203, monitoring the apparent power transmitted by the intelligent ammeter, and if the apparent power is smaller than the first capacitance threshold, synchronously forwarding the second capacitance threshold to a power load by the programmable controller;
If the apparent power is greater than the first capacitance threshold, the difference between the last set second capacitance threshold and the step value of capacitance adjustment is set as a new second capacitance threshold, and steps S202-S203 are repeated until the apparent power is limited below the first capacitance threshold.
In this embodiment, if the second capacitance threshold is set to 95% of the maximum electric power, and the current apparent power is greater than the first capacitance threshold, the second capacitance threshold is reset, and the new second capacitance threshold is the difference between 95% of the maximum electric power and 3% of the maximum electric power, i.e., 92% of the maximum electric power, and steps S202-S203 are repeated until the apparent power is limited below the first capacitance threshold.
The beneficial effects of this embodiment are: the capacitance adjustment stepping value can be reset according to the current apparent power, so that the problem that the capacitance for a short time cannot be reduced below a threshold value in time due to the fact that the capacitance adjustment stepping value is fixed in the prior art is solved;
When the step value is adjusted by the capacitance, the response time of the power load is set as an independent variable, so that the influence of the response time of different power loads on the step time can be compensated.
Example 3
The second capacitance threshold is repeatedly set for many times in embodiment 2, so that the apparent power on the line is limited below the first capacitance threshold, but in embodiment 2, when the stepping value is adjusted, the second capacitance threshold after many times of adjustment is smaller than the minimum capacitance for maintaining the power load, so that the power load is powered down or in a low-power running state, the working benefit of the power load is affected, and a large potential safety hazard exists. Thus, when this occurs, on the one hand the capacity of the power load is quickly raised, and on the other hand the apparent power on the plant line is ensured not to exceed the first capacity threshold during the raising. It can be seen that the step value is particularly important to adjust the capacitance during lifting. The step value for setting the capacitance adjustment during lifting in this embodiment specifically includes the following steps:
S204, setting a third capacitance threshold, wherein the third capacitance threshold is smaller than the first capacitance threshold;
wherein the third capacitance threshold is a minimum capacitance for power load maintenance operation.
S205, judging whether the current apparent power of the power load is larger than a third capacitance threshold, and if the current apparent power is larger than the third capacitance threshold and smaller than the first capacitance threshold, keeping the latest second capacitance threshold of the power load to operate;
If the current apparent power is smaller than the third capacitance threshold, acquiring a difference value between the current apparent power of the power load and the third capacitance threshold, acquiring a new scale factor and an independent variable by adopting the method described in S101-S102 in the embodiment 2, setting the product of the scale factor and the independent variable as a new capacitance adjustment step value, setting the sum of the current apparent power and the new capacitance adjustment step value as a fourth capacitance threshold, transmitting the fourth capacitance threshold to the power load, and limiting the capacitance of the power load below the fourth capacitance threshold based on a PID adjustment algorithm;
S205, monitoring the apparent power transmitted by the intelligent ammeter in real time, and synchronously forwarding a fourth capacitance threshold to a power load by the programmable controller if the apparent power is larger than a third capacitance threshold and smaller than a first capacitance threshold;
If the apparent power is less than the third capacitance threshold, setting a new fourth capacitance threshold by the sum of the last set fourth capacitance threshold and the new step value of capacitance adjustment, and repeating step S205 until the apparent power is limited between the third capacitance threshold and the first capacitance threshold.
In the process of setting the new fourth capacitance threshold, a new fourth capacitance threshold exceeds the first capacitance threshold, at this time, the power load cannot be controlled in the new fourth capacitance threshold mode, because the apparent power on the line exceeds the first capacitance threshold, so the embodiment assigns the value of the first capacitance threshold to the fourth capacitance threshold, controls the power load in the first capacitance threshold mode, and stops the adjustment.
The beneficial effects of this embodiment are: the method and the device have the advantages that the new capacitance adjustment stepping value is set, and the sum of the current apparent power and the new capacitance adjustment stepping value is set to be the fourth capacitance threshold value, so that the capacitance of the power load is increased, and the problem that the power load is in a power-down state or a low-power running state due to the fact that the second capacitance threshold value is lowered for a plurality of times in embodiment 2 is solved, and line balance is maintained.
Example 4
On the basis of embodiment 3, this embodiment provides a capacitance adjustment system, as shown in fig. 2, including a first comparing unit, a first step value setting unit, a second comparing unit, and a second step value setting unit;
The first comparison unit obtains apparent power transmitted by the intelligent ammeter and a first capacitance threshold value set by the power regulator, and compares the apparent power and the first capacitance threshold value; when the apparent power is less than the first capacitance threshold, the power load operates in a first capacitance threshold mode; otherwise, the difference value of the two is transmitted to a first stepping value setting unit;
the first step value setting unit sets the capacitance adjustment step value by the method described in embodiment 2, and repeatedly adjusts the apparent power of the power load a plurality of times based on the capacitance adjustment step value until the apparent power of the power load is limited below the first capacitance threshold;
the second comparison unit obtains apparent power of the power load, compares the apparent power with a preset third capacitance threshold, and operates in a second capacitance threshold mode when the apparent power is larger than the third capacitance threshold; otherwise, the difference value of the two is transmitted to a second stepping value setting unit;
The second step value setting unit sets the capacitance adjustment step value by the method described in embodiment 2, and repeatedly adjusts the apparent power of the power load a plurality of times based on the capacitance adjustment step value until the apparent power of the power load is limited below the third capacitance threshold;
The input end of the first comparison unit is electrically connected with the output ends of the intelligent ammeter and the power regulator respectively, the output end of the first comparison unit is electrically connected with the power load and the input end of the first step value setting unit respectively, and the output end of the first step value setting unit is electrically connected with the power load; the input end of the second comparison unit is electrically connected with the power load, and the output end of the second comparison unit is electrically connected with the power load through the second stepping value setting unit.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A method for regulating capacitance, characterized by: the method comprises the following steps:
S1, building a capacitance adjusting device; the electricity consumption capacity adjusting device comprises an intelligent ammeter, a programmable controller, a power regulator and a power load, wherein the intelligent ammeter collects voltage and current in real time, calculates apparent power based on the voltage and the current, and transmits the apparent power to the programmable controller in real time through MODBUS-RTU communication; the power regulator is used for setting a first capacitance threshold and synchronously transmitting the first capacitance threshold to the programmable controller; the programmable controller compares the apparent power to a first capacitance threshold; when the apparent power exceeds the first capacitance threshold, the programmable controller limits the capacitance of the power load below the first capacitance threshold based on PID regulation theory; the intelligent ammeter is connected with the programmable controller through a data line, and the power regulator is electrically connected with an analog input end of the programmable controller; the power load is electrically connected with the analog output end of the programmable controller;
S2, setting a first capacitance threshold through a power regulator, synchronously transmitting the first capacitance threshold to a programmable controller, and transmitting apparent power to the programmable controller in real time by the intelligent ammeter;
S3, the programmable controller determines power utilization adjustment information of the current power equipment based on the apparent power and the first capacitance threshold, and adjusts the power utilization condition of the power equipment based on the power utilization adjustment information so as to limit the adjusted overall power utilization to be below the first capacitance threshold; the step 3 of determining, by the programmable controller, power consumption adjustment information of the current power device based on the apparent power and the first capacitance threshold specifically includes:
if the apparent power is smaller than the first capacitance threshold, synchronously forwarding the first capacitance threshold set by the power regulator to the power load by the programmable controller;
If the apparent power is larger than the first capacitance threshold, the programmable controller acquires a capacitance adjustment stepping value based on a fuzzy theory, and repeatedly resets the second capacitance threshold for a plurality of times based on the capacitance adjustment stepping value until the apparent power is limited below the first capacitance threshold;
the programmable controller acquires a capacitance adjustment stepping value based on a fuzzy theory, and specifically comprises the following steps of:
s101, setting the difference value between apparent power and a first capacitance threshold as delta S, and setting three sequentially increased fuzzy values L, M and H; judging the difference value between the apparent power and the first capacitance threshold value and the magnitudes of three fuzzy values;
When DeltaS epsilon (a 1, a 2), deltaS is H, when DeltaS epsilon (a 2, a 3), deltaS is M, when DeltaS epsilon (a 3, a 4), deltaS is L, a1, a2, a3, a4 are constants among (0, 1), and a1 < a2 < a3 < a4, setting the ratio of the difference DeltaS and the corresponding fuzzy value as a scale factor;
S102, setting the response time of the power load as an independent variable, and setting the product of the scale factor and the independent variable as a step value regulated by capacitance.
2. A method of capacitance adjustment as defined in claim 1, wherein: the step value based on the adjustment of the capacitance is repeated for a plurality of times to reset the second capacitance threshold value specifically:
S201, setting the difference value between the apparent power and the capacitance adjustment stepping value as a second capacitance threshold value;
s202, transmitting a second capacitance threshold value to the power load, and limiting the capacitance of the power load below the second capacitance threshold value based on a PID (proportion integration differentiation) regulation algorithm;
s203, monitoring the apparent power transmitted by the intelligent ammeter, and if the apparent power is smaller than the first capacitance threshold, synchronously forwarding the second capacitance threshold to a power load by the programmable controller;
If the apparent power is greater than the first capacitance threshold, the difference between the last set second capacitance threshold and the step value of capacitance adjustment is set as a new second capacitance threshold, and steps S202-S203 are repeated until the apparent power is limited below the first capacitance threshold.
3. A method of capacitance adjustment as claimed in claim 2, wherein: the step S203 further includes the following steps after limiting the apparent power to be below the first capacitance threshold:
S204, setting a third capacitance threshold, wherein the third capacitance threshold is smaller than the first capacitance threshold;
s205, judging whether the current apparent power of the power load is larger than a third capacitance threshold, and if the current apparent power is larger than the third capacitance threshold and smaller than the first capacitance threshold, keeping the latest second capacitance threshold of the power load to operate;
If the current apparent power is smaller than the third capacitance threshold, acquiring a difference value between the current apparent power of the power load and the third capacitance threshold, acquiring a new scale factor and an independent variable by adopting the method described in S101-S102, setting the product of the scale factor and the independent variable as a new capacitance adjustment step value, setting the sum of the current apparent power and the new capacitance adjustment step value as a fourth capacitance threshold, transmitting the fourth capacitance threshold to the power load, and limiting the capacitance of the power load below the fourth capacitance threshold based on a PID (proportion integration differentiation) adjustment algorithm;
S205, monitoring the apparent power transmitted by the intelligent ammeter in real time, and synchronously forwarding a fourth capacitance threshold to a power load by the programmable controller if the apparent power is larger than a third capacitance threshold and smaller than a first capacitance threshold;
If the apparent power is less than the third capacitance threshold, setting a new fourth capacitance threshold by the sum of the last set fourth capacitance threshold and the new step value of capacitance adjustment, and repeating step S205 until the apparent power is limited between the third capacitance threshold and the first capacitance threshold.
4. A method of capacitance adjustment as claimed in claim 3, wherein: when the new fourth capacitance threshold is greater than the first capacitance threshold, the value of the first capacitance threshold is assigned to the fourth capacitance threshold.
5. A capacitance adjustment system, characterized by: the device comprises a first comparison unit, a first stepping value setting unit, a second comparison unit and a second stepping value setting unit;
The first comparison unit obtains apparent power transmitted by the intelligent ammeter and a first capacitance threshold value set by the power regulator, and compares the apparent power and the first capacitance threshold value; when the apparent power is less than the first capacitance threshold, the power load operates in a first capacitance threshold mode; otherwise, the difference value of the two is transmitted to a first stepping value setting unit;
The first step value setting unit sets the capacitance adjustment step value by adopting the method of any one of claims 1 to 4, and repeatedly adjusts the apparent power of the power load for a plurality of times based on the capacitance adjustment step value until the apparent power of the power load is limited below a first capacitance threshold;
The second comparison unit obtains the apparent power of the power load, compares the apparent power with a preset third capacitance threshold, and operates in a second capacitance threshold mode when the apparent power is larger than the third capacitance threshold; otherwise, the difference value of the two is transmitted to a second stepping value setting unit;
The second step value setting unit sets the capacitance adjustment step value by adopting the method of any one of claims 1 to 4, and repeatedly adjusts the apparent power of the power load for a plurality of times based on the capacitance adjustment step value until the apparent power of the power load is limited below a third capacitance threshold;
The input end of the first comparison unit is electrically connected with the output ends of the intelligent ammeter and the power regulator respectively, the output end of the first comparison unit is electrically connected with the power load and the input end of the first step value setting unit respectively, and the output end of the first step value setting unit is electrically connected with the power load; the input end of the second comparison unit is electrically connected with the power load, and the output end of the second comparison unit is electrically connected with the power load through the second stepping value setting unit.
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