CN111864735A - Switching compensation system - Google Patents
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- CN111864735A CN111864735A CN202010711629.2A CN202010711629A CN111864735A CN 111864735 A CN111864735 A CN 111864735A CN 202010711629 A CN202010711629 A CN 202010711629A CN 111864735 A CN111864735 A CN 111864735A
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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
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Abstract
The invention discloses a switching compensation system, which comprises: a parameter sampling circuit, an electric energy compensation and switching circuit and a microcomputer control circuit; the parameter sampling circuit is used for acquiring load parameters in real time and sending the load parameters to the microcomputer control circuit; the microcomputer control circuit is used for controlling the switching state of the electric energy compensation and switching circuit according to the real-time collected load parameters so as to control the electric energy compensation and switching circuit to perform electric energy compensation on the load; the electric energy compensation and switching circuit is used for carrying out electric energy compensation on a load, and comprises a circuit breaker, a reactor group, a transistor group, a capacitor group and a remote signaling isolation unit which are sequentially connected according to a signal transmission direction. The invention has simple structure, stable and reliable data acquisition and processing, convenient monitoring of load electric energy and realization of rapid stabilization of power grid operation and rapid compensation of load power consumption loss.
Description
Technical Field
The invention relates to the technical field of automatic control of power systems, in particular to a switching compensation system.
Background
The operation requirement of the power system meets the intelligent and informatization power supply characteristics, the intelligent power supply modes of distributed power generation and interactive power supply require that the sampling and error of the electric energy parameters can reach the accurate control requirement, the power consumption of the load is matched with the total capacity, the electric energy loss and the transmission energy are monitored and compensated in time, and the stability of the power supply voltage and the operation of the load is ensured.
When studying electric power system stability and security, can compromise the model selection of power supply operation mode and consumer, can set for certain power consumption capacity in advance, when load continuous operation or receive the interference, it is too big to appear the electric energy loss, can lead to circuit and electrical equipment overload operation, influences the safety of electric wire netting and the normal operating of load.
Usually, a fast switching compensation device is adopted to improve load loss energy, a control decision is made in the aspect of stabilizing power supply voltage and power factors, however, in the process of changing some parameters and dynamically fluctuating load, the compensation effect often fails to reach the expected target, the situation that the compensation voltage and the power factors are improved in a certain time period, the voltage is reduced or fluctuates in the next section, the power grid operation still cannot be fast and stable, and the power consumption loss compensation fails to reach the expected value.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a switching compensation system which is simple in structure, stable and reliable in data acquisition and processing, convenient in load electric energy monitoring and capable of realizing rapid and stable operation of a power grid and rapid compensation of load power consumption loss.
In order to achieve the purpose, the invention adopts the following technical scheme that:
a switching compensation system comprises the following components: a parameter sampling circuit, an electric energy compensation and switching circuit and a microcomputer control circuit;
the parameter sampling circuit is used for acquiring load parameters, namely a current value and a voltage value of a load in real time and transmitting the acquired load parameters to the microcomputer control circuit in real time;
the electric energy compensation and switching circuit is used for carrying out electric energy compensation on the load;
the microcomputer control circuit is used for controlling the switching state of the electric energy compensation and switching circuit according to the load parameters so as to control the electric energy compensation and switching circuit to perform electric energy compensation on the load.
The parameter sampling circuit includes: the mutual inductor unit, the AD conversion unit and the DSP unit are sequentially connected according to the signal transmission direction;
the transformer unit is arranged between the low-voltage bus side and the load; the mutual inductor unit is used for collecting load parameters, and the collected load parameters are analog quantities; the mutual inductor unit sends the acquired analog quantity of the load parameters to the AD conversion unit; the transformer unit includes: a current transformer TA and a voltage transformer TV; the current transformer TA is used for collecting the current value of a load; the voltage transformer TV is used for acquiring a voltage value of a load;
the AD conversion unit is used for converting the analog quantity of the load parameters collected by the mutual inductor unit into digital quantity and sending the converted load parameters to the DSP unit;
the DSP unit is used for generating a change waveform of the load parameter according to the load parameter, namely respectively generating a current change waveform and a voltage change waveform of the load; and the DSP unit sends the load parameters and the variation waveforms of the load parameters to the microcomputer control circuit.
The electric energy compensation and switching circuit comprises: the circuit breaker, the reactor group, the transistor group, the capacitor group and the remote signaling isolation unit are sequentially connected according to the signal transmission direction;
the circuit breaker is used for controlling the input and the removal of the whole electric energy compensation and switching circuit;
the reactor group comprises an inductive impedance and a reactor which are connected in parallel and is used for filtering interference signals in the electric energy compensation and switching circuit;
the transistor group comprises a plurality of transistors which are connected in parallel and are in unidirectional conduction and reverse cut-off;
the capacitor bank comprises a plurality of capacitors connected in parallel;
each transistor in the transistor group corresponds to one capacitor in the capacitor group, and each transistor is used for controlling the input and the cut-off of the corresponding capacitor; each capacitor in the capacitor bank corresponds to a load, and each capacitor is used for performing electric energy compensation on the corresponding load;
the remote signaling isolation unit is used for sending the closing or opening state of the circuit breaker and the closing or opening state of each transistor in the transistor group to the microcomputer control circuit.
The microcomputer control and feedback circuit comprises: the device comprises a main controller, an alarm unit and an output isolation unit;
the main controller receives the load parameters sent by the parameter sampling circuit and calculates the load electric energy according to the load parameters, namely the current value and the voltage value of the load;
the main controller starts an alarm unit to alarm according to the load electric energy;
the main controller controls the switching state of the electric energy compensation and switching circuit through the output isolation unit according to the load electric energy, namely controls the on or off of the circuit breaker and controls the on or off of each transistor in the transistor group, so that the input and the cut-off of the whole electric energy compensation and switching circuit are controlled, and the input and the cut-off of each capacitor in the capacitor group are controlled.
The main controller controls the switching state of the electric energy compensation and switching circuit through the output isolation unit, and the specific mode is as follows:
s1, the main controller judges whether the load electric energy exceeds the set interval range:
if the load electric energy does not exceed the set interval range, the electric energy compensation is not needed to be carried out on the load, the main controller puts in an electric energy compensation and switching circuit through an output isolation unit and controls the electric energy compensation and switching circuit to carry out isolation filtering on an electric energy transmission line of the load, namely, the main controller controls the circuit breaker to be in a closed state, the transistor trigger valve in the transistor group is in an open state, the capacitor in the capacitor group is in a charging state, and the electric energy compensation is not carried out on the load;
if the electric energy of a certain load exceeds the range of a set interval, the main controller starts an alarm unit to give an alarm, and meanwhile, electric energy compensation needs to be carried out on the load, the main controller inputs an electric energy compensation and switching circuit through an output isolation unit and controls the electric energy compensation and switching circuit to carry out electric energy compensation on the load, specifically, a capacitor corresponding to the load is input, and electric energy compensation is carried out on the load, namely, the main controller closes a transistor trigger valve corresponding to the capacitor corresponding to the load;
s2, after the main controller controls the capacitor to compensate the electric energy of a load, the main controller calculates the power factor corresponding to the load according to the load parameter sent by the parameter sampling circuit, and determines the power factor corresponding to the load:
if the power factor is greater than or equal to 0.9, the load meets the requirement of electric energy compensation, at the moment, the main controller cuts off the capacitor corresponding to the load through the output isolation unit and does not continue to perform electric energy compensation on the load, namely, the main controller cuts off the transistor trigger valve corresponding to the capacitor corresponding to the load;
if the power factor is less than 0.9, the load does not meet the requirement of electric energy compensation, at the moment, the main controller continues to input the capacitor corresponding to the load through the output isolation unit and continues to perform electric energy compensation on the load, namely, the main controller does not disconnect the transistor trigger valve corresponding to the capacitor corresponding to the load;
wherein, the load corresponds to the power factor at the moment
The calculation method is as follows:
p represents rated power of the load, U and I represent current value and voltage value of the load at the moment respectively;
s3, the main controller determines that the power factor of a load is greater than or equal to 0.9, and after the main controller cuts off the capacitor corresponding to the load, the main controller calculates the load power corresponding to the load according to the load parameter sent by the parameter sampling circuit at this time, and determines whether the load power corresponding to the load still exceeds the set interval range:
if the load electric energy corresponding to the load still exceeds the set interval range at the moment, the main controller starts an alarm unit to give an alarm, and meanwhile, the main controller cuts off an electric energy compensation and switching circuit through an output isolation unit, namely, the main controller controls the circuit breaker to be in a disconnection state;
if the load electric energy corresponding to the load does not exceed the set interval range at the moment, the main controller puts in an electric energy compensation and switching circuit through an output isolation unit and controls the electric energy compensation and switching circuit to carry out isolation filtering on an electric energy transmission line of the load, namely, the main controller controls a circuit breaker to be in a closed state, a transistor trigger valve in a transistor group is in an open state, a capacitor in the capacitor group is in a charging state, and the load is not subjected to electric energy compensation;
and the load power returns to the stable state, the main controller continues to monitor the load power, and the step S1 is executed again.
The microcomputer control and feedback circuit further comprises: a main controller and a display screen;
the main controller receives the load parameters and the variation waveforms of the load parameters sent by the parameter sampling circuit, and calculates the load electric energy according to the load parameters, namely the current value and the voltage value of the load; and the main controller sends the calculated load electric energy and the change waveform of the load parameter to a display screen for displaying.
The invention has the advantages that:
(1) the switching compensation system has the advantages of simple structure, stable and reliable data acquisition and processing, convenience in load electric energy monitoring, and quickness and effectiveness in electric energy compensation of the load.
(2) The electric energy compensation and switching circuit is provided with the reactor group at the front end of the capacitor group, so that filtering is eliminated, and the stability of load electric energy is improved.
(3) The invention adopts a non-contact switching technology to realize the rapid input and cut-off of an electric energy compensation and switching circuit, performs electric energy compensation on a load, improves a power factor, and rapidly stabilizes load electric energy.
(4) The invention utilizes the alarm unit to realize the acousto-optic alarm when the load is over-voltage, over-current, over-compensation and under-compensation.
(5) The invention utilizes the display screen to realize the display of the load electric energy and the change waveform of the load parameter, is convenient for the working personnel to check in real time, and the working personnel can also manually disconnect the switch of the circuit breaker in the electric energy compensation and switching circuit if the harmonic waveform or the load electric energy change is abnormal, thereby cutting off the whole electric energy compensation and switching circuit, preventing the overvoltage and overcurrent from burning the electric energy compensation and switching circuit and the load, and playing a role of protecting the electric energy compensation and switching circuit and the load.
Drawings
Fig. 1 is an overall schematic diagram of the switching compensation system of the present invention.
Fig. 2 is a schematic diagram of the power compensation and switching circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the switching compensation system of the present invention includes the following components: a parameter sampling circuit 1, an electric energy compensation and switching circuit 2 and a microcomputer control circuit 3. The parameter sampling circuit 1 is used for collecting load parameters, namely a current value and a voltage value of a load in real time, the electric energy compensation and switching circuit 2 is used for carrying out electric energy compensation on the load, and the microcomputer control circuit 3 is used for controlling the switching state of the electric energy compensation and switching circuit 2 according to the load parameters collected by the parameter sampling circuit 1 in real time so as to realize the electric energy compensation on the load.
As shown in fig. 1, the parameter sampling circuit 1 includes: the device comprises a mutual inductor unit 11, an AD conversion unit 12 and a DSP unit 13 which are connected in sequence according to the signal transmission direction.
The transformer unit 11 is arranged between the low-voltage bus side and the load end; the transformer unit 11 is used for collecting load parameters; the transformer unit 11 includes: a current transformer TA and a voltage transformer TV; the current transformer TA is used for collecting the current value of a load, and the voltage transformer TV is used for collecting the voltage value of the load; namely, the load parameters collected by the transformer unit 11 include a current value and a voltage value of the load, and the load parameters collected by the transformer unit 11 are analog quantities; the transformer unit 11 sends the analog quantity of the acquired load parameter to the AD conversion unit 12.
The AD conversion unit 12 is configured to convert the analog quantity of the load parameter collected by the transformer unit 11 into a digital quantity, and send the digital quantity of the load parameter to the DSP unit 13.
The DSP unit 13 is used for generating a change waveform of the load parameter according to the digital quantity of the load parameter, and respectively generating a current change waveform and a voltage change waveform of the load; the DSP unit 13 sends the load parameters and the variation waveforms of the load parameters to the microcomputer control circuit 3.
As shown in fig. 1 and fig. 2, the power compensation and switching circuit 2 includes: the circuit breaker 21, the reactor group 22, the transistor group 23, the capacitor group 24 and the remote signaling isolation unit 25 are connected in sequence according to the signal transmission direction.
The circuit breaker 21 is used for controlling the input and the cut-off of the electric energy compensation and switching circuit 2.
The reactor group 22 includes an inductive impedance and a reactor connected in parallel, and is used for filtering an interference signal, filtering the interference signal in the electric energy compensation and switching circuit 2, and performing isolation filtering on the electric energy transmission line of the load, so as to reduce fluctuation of the electric energy transmission line during load operation and ensure that electric energy transmission is not interfered.
The transistor group 23 includes a plurality of transistors which are connected in parallel, are unidirectionally turned on and reversely turned off, and have functions of both diode turning on and reverse turning off to prevent breakdown of the capacitor. In the embodiment, the transistor is used as a switch, has the characteristics of diode triggering and reverse breakdown protection, has photoelectric triggering and self-cooling heat dissipation, and is long in service life and service life.
The capacitor bank 24 includes a plurality of capacitors connected in parallel for compensating electrical energy of the load, each capacitor corresponding to a load.
Each transistor in the transistor group 23 corresponds to a capacitor, and each transistor is used for controlling the input and the cut-off of the corresponding capacitor, that is, for controlling the power compensation of the load corresponding to the corresponding capacitor.
The remote signaling isolation unit 25 is used for sending the closed or open state of the circuit breaker 21 and the closed or open state of each transistor in the transistor group 23 to the main controller 31 of the microcomputer control circuit 3.
As shown in fig. 1, the microcomputer control and feedback circuit 3 includes: main controller 31, alarm unit 32, output isolation unit 33, display screen 34.
The main controller 31 receives the load parameter and the variation waveform of the load parameter transmitted from the DSP unit 13.
The main controller 31 calculates load power, i.e., load electric energy, according to load parameters, i.e., according to a current value and a voltage value of a load, the main controller 31 sends the calculated load electric energy and a variation waveform of the load parameters to the display screen 34 for display, a worker can check the load electric energy and the variation waveform of the load parameters on the display screen 34 in real time, and if a harmonic waveform or abnormal variation of the load electric energy occurs on the display screen 34, the worker can manually turn off a switch of the circuit breaker 21 in the electric energy compensation and switching circuit, so that the whole electric energy compensation and switching circuit 2 is cut off, the electric energy compensation and switching circuit 2 and the load are prevented from being burnt by overvoltage and overcurrent, and the electric energy compensation and switching circuit 2 and the load are protected.
The main controller 31 controls the on/off of the circuit breaker 21 in the power compensation and switching circuit 2 and the on/off of each transistor in the transistor group 23 according to the load power and through the output isolation unit 33, so as to control the input and the cut-off of the whole power compensation and switching circuit 2 and the input and the cut-off of each capacitor in the capacitor group 24, thereby stabilizing the load power and ensuring that the load power can quickly return to a smaller fluctuation range and a set interval range, and the specific control process is as follows:
s1, the main controller 31 determines whether the load power exceeds the set interval range:
if the load electric energy does not exceed the set interval range, the electric energy compensation is not needed to be carried out on the load, the main controller 31 inputs the electric energy compensation and switching circuit 2 through the output isolation unit 33, and controls the electric energy compensation and switching circuit 2 to carry out isolation filtering on the electric energy transmission line of the load so as to reduce the fluctuation of the electric energy transmission line during the load operation and ensure that the electric energy transmission is not interfered, namely, the main controller 31 controls the circuit breaker 21 to be in a closed state, the transistor trigger valve in the transistor group 23 is in an open state, the capacitor in the capacitor group 24 is in a charging state, and the electric energy compensation is not carried out on the load;
if the electric energy of a certain load exceeds the range of the set interval, the main controller 31 starts the alarm unit 32 to perform sound and light alarm, and at the same time, electric energy compensation needs to be performed on the load, the main controller 31 inputs the electric energy compensation and switching circuit 2 through the output isolation unit 33, and controls the electric energy compensation and switching circuit 2 to perform electric energy compensation on the load, so as to pull the electric energy of the load back to the range of the set interval, specifically, the electric energy compensation is performed on the load by inputting the capacitor corresponding to the load, that is, the main controller 31 closes the transistor trigger valve corresponding to the capacitor corresponding to the load.
S2, after the main controller 31 controls the input of the capacitor to compensate the electric energy of a certain load, the main controller 31 calculates the power factor corresponding to the load at this time according to the load parameter sent by the DSP unit 13 received at this time, and determines the power factor corresponding to the load at this time:
if the power factor is greater than or equal to 0.9, it indicates that the load meets the requirement of electric energy compensation, and at this time, the main controller 31 cuts off the capacitor corresponding to the load through the output isolation unit 33, and does not continue to perform electric energy compensation on the load, that is, disconnects the transistor trigger valve corresponding to the capacitor corresponding to the load;
if the power factor is less than 0.9, it indicates that the load does not meet the requirement of power compensation, and at this time, the main controller 31 continues to input the capacitor corresponding to the load through the output isolation unit 33, and continues to perform power compensation on the load, that is, does not disconnect the transistor trigger valve corresponding to the capacitor corresponding to the load.
Wherein, the load corresponds to the power factor at the moment
The calculation method is as follows:
p represents the rated power of the load, and U and I represent the current value and the voltage value of the load at that time, respectively.
S3, the main controller 31 determines that the power factor of a load is greater than or equal to 0.9, and after the main controller 31 cuts off the capacitor corresponding to the load, the main controller 31 calculates the load power corresponding to the load according to the load parameter sent by the DSP unit 13 received at this time, and determines whether the load power corresponding to the load still exceeds the set interval range:
if the load electric energy corresponding to the load still exceeds the set interval range at this time, the main controller 31 starts the alarm unit 32 to perform audible and visual alarm, and meanwhile, the main controller 31 cuts off the electric energy compensation and switching circuit 2 through the output isolation unit 33, that is, the main controller 31 controls the circuit breaker 21 to be in a disconnection state, so as to prevent overvoltage and overcurrent from burning the electric energy compensation and switching circuit 2 and the load;
if the load electric energy corresponding to the load does not exceed the set interval range at this time, the main controller 31 puts in the electric energy compensation and switching circuit 2 through the output isolation unit 33, and controls the electric energy compensation and switching circuit 2 to perform isolation filtering on the electric energy transmission line of the load, so as to reduce fluctuation of the electric energy transmission line during load operation and ensure that the electric energy transmission is not interfered, that is, the main controller 31 controls the circuit breaker 21 to be in a closed state, the transistor trigger valves in the transistor group 23 are in an open state, the load electric energy is recovered to a stable state, the main controller 31 continues to monitor the load electric energy, and the step S1 is performed again.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The switching compensation system is characterized by comprising the following components: the device comprises a parameter sampling circuit (1), an electric energy compensation and switching circuit (2) and a microcomputer control circuit (3);
the parameter sampling circuit (1) is used for acquiring load parameters, namely a current value and a voltage value of a load in real time and sending the acquired load parameters to the microcomputer control circuit (3) in real time;
the electric energy compensation and switching circuit (2) is used for carrying out electric energy compensation on a load;
the microcomputer control circuit is used for controlling the switching state of the electric energy compensation and switching circuit (2) according to the load parameters so as to control the electric energy compensation and switching circuit (2) to perform electric energy compensation on the load.
2. The switching compensation system according to claim 1, wherein the parameter sampling circuit (1) comprises: the transformer unit (11), the AD conversion unit (12) and the DSP unit (13) are connected in sequence according to the signal transmission direction;
the transformer unit (11) is arranged between the low-voltage bus side and a load; the transformer unit (11) is used for collecting load parameters, and the collected load parameters are analog quantities; the transformer unit (11) sends the acquired analog quantity of the load parameter to an AD conversion unit (12); the transformer unit (11) includes: a current transformer TA and a voltage transformer TV; the current transformer TA is used for collecting the current value of a load; the voltage transformer TV is used for acquiring a voltage value of a load;
the AD conversion unit (12) is used for converting the analog quantity of the load parameters acquired by the mutual inductor unit (11) into digital quantity and sending the converted load parameters to the DSP unit (13);
the DSP unit (13) is used for generating a change waveform of the load parameter according to the load parameter, namely respectively generating a current change waveform and a voltage change waveform of the load; and the DSP unit (13) sends the load parameters and the variation waveforms of the load parameters to the microcomputer control circuit (3).
3. The switching compensation system according to claim 1, wherein the power compensation and switching circuit (2) comprises: the circuit breaker (21), the reactor group (22), the transistor group (23), the capacitor group (24) and the remote signaling isolation unit (25) are connected in sequence according to the signal transmission direction;
the circuit breaker (21) is used for controlling the switching-in and the switching-off of the whole electric energy compensation and switching circuit (2);
the reactor group (22) comprises an inductive impedance and a reactor which are connected in parallel and is used for filtering interference signals in the electric energy compensation and switching circuit (2);
the transistor group (23) comprises a plurality of transistors which are connected in parallel and are in unidirectional conduction and reverse cut-off;
the capacitor bank (24) comprises a plurality of capacitors connected in parallel;
each transistor in the transistor group (23) corresponds to one capacitor in the capacitor group (24), and each transistor is used for controlling the input and the cut-off of the corresponding capacitor; each capacitor in the capacitor bank (24) corresponds to a load, and each capacitor is used for performing electric energy compensation on the corresponding load;
the remote signaling isolation unit (25) is used for sending the closed or open state of the circuit breaker (21) and the closed or open state of each transistor in the transistor group (23) to the microcomputer control circuit (3).
4. The switching compensation system according to claim 3, wherein the microcomputer control and feedback circuit (3) comprises: a main controller (31), an alarm unit (32) and an output isolation unit (33);
the main controller (31) receives the load parameters sent by the parameter sampling circuit (1) and calculates the load electric energy according to the load parameters, namely the current value and the voltage value of the load;
the main controller (31) starts an alarm unit (32) to alarm according to the load electric energy;
the main controller (31) controls the switching state of the electric energy compensation and switching circuit (2), namely controls the on or off of the circuit breaker (21) and controls the on or off of each transistor in the transistor group (23) according to the load electric energy through the output isolation unit (33), so that the input and the cut-off of the whole electric energy compensation and switching circuit (2) are controlled, and the input and the cut-off of each capacitor in the capacitor group (24) are controlled.
5. The switching compensation system according to claim 4, wherein the main controller (31) controls the switching state of the power compensation and switching circuit (2) through the output isolation unit (33), specifically as follows:
s1, the main controller (31) judges whether the load electric energy exceeds the set interval range:
if the load electric energy does not exceed the set interval range, the electric energy compensation is not needed to be carried out on the load, the main controller (31) inputs the electric energy compensation and switching circuit (2) through the output isolation unit (33), and controls the electric energy compensation and switching circuit (2) to carry out isolation filtering on an electric energy transmission line of the load, namely, the main controller (31) controls the circuit breaker (21) to be in a closed state, the transistor trigger valve in the transistor group (23) is in an open state, the capacitor in the capacitor group (24) is in a charging state, and the electric energy compensation is not carried out on the load;
if the electric energy of a certain load exceeds the range of a set interval, the main controller (31) starts an alarm unit (32) to alarm, and meanwhile, electric energy compensation needs to be carried out on the load, the main controller (31) inputs an electric energy compensation and switching circuit (2) through an output isolation unit (33), controls the electric energy compensation and switching circuit (2) to carry out electric energy compensation on the load, specifically, inputs a capacitor corresponding to the load, and carries out electric energy compensation on the load, namely, the main controller (31) closes a transistor trigger valve corresponding to the capacitor corresponding to the load;
s2, after the main controller (31) controls the input of the capacitor to compensate the electric energy of a certain load, the main controller (31) calculates the power factor corresponding to the load according to the load parameter sent by the parameter sampling circuit (1) at this time, and determines the power factor corresponding to the load at this time:
if the power factor is greater than or equal to 0.9, the load meets the requirement of electric energy compensation, at this time, the main controller (31) cuts off the capacitor corresponding to the load through the output isolation unit (33) and does not continue to perform electric energy compensation on the load, namely, the main controller (31) disconnects the transistor trigger valve corresponding to the capacitor corresponding to the load;
if the power factor is less than 0.9, the load does not meet the requirement of electric energy compensation, at this time, the main controller (31) continues to input the capacitor corresponding to the load through the output isolation unit (33) and continues to perform electric energy compensation on the load, namely, the main controller (31) does not disconnect the transistor trigger valve corresponding to the capacitor corresponding to the load;
wherein, the load corresponds to the power factor at the moment
The calculation method is as follows:
p represents rated power of the load, U and I represent current value and voltage value of the load at the moment respectively;
s3, the main controller (31) determines that the power factor of a load is greater than or equal to 0.9, and after the main controller (31) cuts off the capacitor corresponding to the load, the main controller (31) calculates the load power corresponding to the load according to the load parameter sent by the parameter sampling circuit (1) at this time, and determines whether the load power corresponding to the load still exceeds the set interval range:
if the load electric energy corresponding to the load still exceeds the set interval range at the moment, the main controller (31) starts an alarm unit (32) to alarm, and meanwhile, the main controller (31) cuts off the electric energy compensation and switching circuit (2) through an output isolation unit (33), namely, the main controller (31) controls the circuit breaker (21) to be in a disconnected state;
if the load electric energy corresponding to the load does not exceed the set interval range at the moment, the main controller (31) puts in the electric energy compensation and switching circuit (2) through the output isolation unit (33) and controls the electric energy compensation and switching circuit (2) to carry out isolation filtering on an electric energy transmission line of the load, namely, the main controller (31) controls the circuit breaker (21) to be in a closed state, the transistor trigger valve in the transistor group (23) is in an open state, the capacitor in the capacitor group (24) is in a charging state, and the load is not subjected to electric energy compensation;
and (4) the load power returns to the stable state, the main controller (31) continues to monitor the load power, and the step S1 is executed again.
6. The switching compensation system according to claim 1, wherein the microcomputer control and feedback circuit (3) further comprises: a main controller (31) and a display screen (34);
the main controller (31) receives the load parameters and the variation waveforms of the load parameters sent by the parameter sampling circuit (1), and calculates the load electric energy according to the load parameters, namely the current value and the voltage value of the load; and the main controller (31) sends the calculated load electric energy and the change waveform of the load parameter to a display screen (34) for displaying.
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