CN116014730B - Flexible load regulation and control device, system and regulation and control method - Google Patents
Flexible load regulation and control device, system and regulation and control method Download PDFInfo
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- 238000005070 sampling Methods 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052710 silicon Inorganic materials 0.000 claims description 19
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- 238000000354 decomposition reaction Methods 0.000 claims description 8
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The application belongs to the technical field of flexible load regulation and control, and particularly provides a flexible load regulation and control device, a system and a regulation and control method, wherein the system comprises a metering switch cabinet and the flexible load regulation and control device connected with the switch cabinet; the flexible load control device is connected with a management end; the management end sends electricity limiting information to the flexible load regulation and control device; the flexible load regulation device is connected with the secondary side line of the metering switch cabinet and used for collecting alternating current, detecting zero phase sequence of the collected alternating current signal, and PWM regulating and outputting the alternating current signal to the primary side main line inlet end of the metering switch cabinet according to the received electricity limiting information and zero-crossing signal detected and output by the zero phase sequence; and the output end of the primary side main line of the metering switch cabinet is connected with a useful electrical appliance. The electric quantity income of the power grid company is guaranteed, more importantly, unnecessary loss of a user side can be reduced under special conditions, and limited conservation is realized.
Description
Technical Field
The application relates to the technical field of flexible load regulation and control, in particular to a flexible load regulation and control device, a system and a regulation and control method.
Background
The problems of the serious global energy supply and demand contradiction and extremely high heat weather influence in summer, difficult regulation and control and slow response are two biggest problems directly influencing the emergency execution force of the power grid, and have been plagued by management units for many years. If the regulation is simplified and the response speed is improved, only electric devices can be relied on, but no devices for solving the two problems are specially and simultaneously arranged on the market.
The existing regulation and control mode directly cuts off the load through a common switch, and the common switch only has two states of on and off, so that the quick response and the simple regulation and control can be realized, but the direct load cut-off can cause a plurality of negative consequences, and firstly, the damage of customer equipment and the waste of raw materials of customer products can be caused; secondly, it is difficult to make a decision on which company and which equipment is cut directly because the switches for cutting the load directly are all arranged on branch lines behind the ammeter, the ammeter for measuring current or power is not arranged on the branch lines, excessive load is caused by excessive execution of the switches for cutting the load directly, waste of electric energy is caused, loss of clients and loss of sales power of companies are caused, and less execution is caused, so that the indexes of the voltage limit are likely to be not reached, decision failure is caused, and Gao Fengya force of a power grid is continuously increased.
The AC power consumption circuit is generally divided into three types of inductive, capacitive and resistive according to the power consumption load property, and current industrial enterprises have power rate adjustment indexes, so that the power factors are over 90 percent, and some power factors can even reach 97 percent, and the AC power consumption circuit is very ideal. Taking a pure resistor circuit as an example, the current and voltage waveforms in the pure resistor circuit are the PWM regulation technology, and the PWM regulation technology is a circuit which realizes that the current and the voltage flowing in the same time generate the same effect by adjusting the duty ratio. The direct application in ac circuits is rare, most of which are the rectification of ac power to dc power, and PWM regulation is more common. But the electrical energy lost by such a method is relatively large.
Disclosure of Invention
Aiming at the existing regulation and control mode, the load is directly cut off through a common switch, and the common switch only has two states of on and off, so that the quick response and the simple regulation and control can be realized, but the direct cut-off of the load can cause a plurality of negative consequences, and firstly, the damage of customer equipment and the waste of raw materials of customer products can be caused; secondly, it is difficult to determine which company and which equipment is cut directly by cutting the load, because the switches for cutting the load directly are all arranged on branch lines behind the ammeter, the branch lines are not provided with meters for measuring current or power, excessive load limit is caused by excessive execution of the switches for cutting the load directly, electric energy is wasted, loss of clients and loss of electric quantity sold by the company are caused, and less execution is caused, and the problems that the indexes of the load limit cannot be met, decision failure is caused, and the Gao Fengya force of a power grid is increased continuously are likely to be caused.
In a first aspect, the technical scheme of the application also provides a flexible load regulation and control device, which comprises a sampling resistor and a singlechip;
the sampling resistor is connected to the power supply secondary side line and used for limiting the current of the line;
the sampling resistor is connected with a zero-crossing detection module;
the zero-crossing detection module is connected with the singlechip and is used for carrying out zero-phase sequence detection on the alternating current signal output by the sampling resistor and outputting a zero-crossing signal to the singlechip;
the singlechip is connected with a primary side line inlet of power supply through a controllable silicon; the singlechip adjusts PWM to a primary side line inlet of power supply by controlling the on-off of the controllable silicon according to the zero crossing signal.
The application provides a flexible load control device, which can control the power of a user side by regulating and controlling the current of the user side on the basis of not changing the voltage of the user side, can complete the load limiting task, simultaneously avoid the excessive concentration of the load limiting task on a power consumer, realize that no matter how much power is used by the user, only the participation of the user is uniformly and proportionally participated in the load limiting, be fairly for the user, automatically calculate the load limiting and the power through a management terminal, automatically send down the load limiting strategy (namely proportional load limiting or non-proportional load limiting), complete all the works of the power grid in the early stage of emergency state load limiting, and be convenient, efficient, accurate and indiscriminate.
As a preferred aspect of the present application, the zero-crossing detection module includes a photo coupler; the power supply secondary side line comprises an alternating current input L end and an alternating current input N end; the number of the photoelectric couplers is two, namely a first photoelectric coupler and a second photoelectric coupler;
the alternating current input end L is connected with a first end of the primary side of the first photoelectric coupler through a sampling resistor, and a second end of the primary side of the first photoelectric coupler is connected with the alternating current input end N;
the first end of the secondary side of the first photoelectric coupler is connected with a first power supply through a first resistor, and the second end of the secondary side of the first photoelectric coupler is grounded; the first end of the secondary side of the first photoelectric coupler is connected with the singlechip;
the alternating current input end L is connected with the second end of the primary side of the second photoelectric coupler through a sampling resistor, and the first end of the primary side of the second photoelectric coupler is connected with the alternating current input end N;
the first end of the secondary side of the second photoelectric coupler is connected to a first power supply through a second resistor, and the second end of the secondary side of the second photoelectric coupler is grounded; the first end of the second side of the second photoelectric coupler is connected with the singlechip.
According to the application, two photoelectric couplers are arranged, one photoelectric coupler is driven to be conducted according to the voltage of each half period of alternating current, the output signal of the photoelectric coupler is input to the singlechip, the singlechip receives a zero-crossing detection signal, the singlechip respectively regulates the upper half period and the lower half period of the alternating current according to the action of the received zero-crossing detection signal by controlling the silicon controlled rectifier, and the main circuit for regulating the duty ratio to the primary side is output by combining the electricity limiting information to realize the electricity limiting regulation.
As an optimization of the technical scheme of the application, the zero crossing detection module further comprises a compensation adjustment module for performing transformation adjustment on the waveform of the output signal of the photoelectric coupler;
the compensation adjustment module comprises a first compensation adjustment module and a second compensation adjustment module;
the first end of the secondary side of the first photoelectric coupler is connected with the singlechip through a first compensation adjustment module;
the first end of the second side of the second photoelectric coupler is connected with the singlechip through a second compensation adjustment module.
Because the singlechip is a high-sensitivity singlechip, compensation adjustment is arranged to convert waveforms output by the photoelectric coupler in order to ensure that signals output by the photoelectric coupler to the singlechip do not influence the processing judgment of the singlechip.
As the optimization of the technical scheme of the application, the device also comprises a regulation and control indicator lamp connected with the singlechip;
when the flexible load regulating device starts to operate for regulation, the singlechip controls the regulation indicator lamp to be lighted.
When the electricity limiting regulation task is received, the flexible load regulation device executes regulation, and a regulation indicator light of the flexible load regulation device is on, so that the staff can conveniently check and watch records.
In a second aspect, the technical scheme of the application also provides a metering switch cabinet, which comprises the flexible load regulating device according to the first aspect;
the sampling resistor is connected to the secondary side line of the metering switch cabinet and used for limiting the current of the line;
the singlechip is connected with a primary side inlet end of the metering switch cabinet through a controllable silicon.
The flexible load regulation device is arranged in the metering switch cabinet, when electricity limiting is not needed, the flexible load regulation device in the metering switch cabinet is not started in normal operation, and when the electricity limiting task is received, the flexible load regulation device in the metering switch cabinet is started.
As the optimization of the technical scheme of the application, a current transformer is arranged in a secondary side line of the metering switch cabinet, and a sampling resistor is connected with a secondary side line of the current transformer;
the upper portion of the metering switch cabinet is provided with an electric energy meter.
When the input voltage of the metering switch cabinet is large, a current/voltage transformer is generally arranged on the secondary line side of the metering switch cabinet, and the acquisition resistor acquires an alternating current signal subjected to voltage reduction after passing through the transformer so as to ensure the safety of the flexible load regulation and control device.
In a third aspect, the technical scheme of the application also provides a flexible load regulation and control system, which comprises a metering switch cabinet and the flexible load regulation and control device connected with the switch cabinet;
the flexible load control device is connected with a management end;
the management end sends electricity limiting information to the flexible load regulation and control device;
the flexible load regulation device is connected with the secondary side line of the metering switch cabinet and used for collecting alternating current, detecting zero phase sequence of the collected alternating current signal, and PWM regulating and outputting the alternating current signal to the primary side main line inlet end of the metering switch cabinet according to the received electricity limiting information and zero-crossing signal detected and output by the zero phase sequence;
and the output end of the primary side main line of the metering switch cabinet is connected with a useful electrical appliance.
As the optimization of the technical scheme of the application, the number of the metering switch cabinets is a plurality of metering switch cabinets;
each metering switch cabinet is connected with a flexible load regulating device.
As the optimization of the technical scheme of the application, the system also comprises a transformer, wherein a power supply grid is connected with the input end of the transformer through an electric wire, and the output end of the transformer is connected with the primary side main line inlet end of the metering switch cabinet.
The system also comprises an emergency early warning device connected with the management end;
the management end is used for responding to the emergency plan after receiving the emergency plan, analyzing the index to generate an index decomposition scheme, outputting decomposed pressure limiting indexes and transmitting the decomposed pressure limiting indexes to the corresponding flexible load regulation and control devices; sending an early warning message to an emergency early warning device while issuing the partial pressure index;
and the emergency early warning device is used for carrying out electricity limiting early warning after receiving the early warning message.
In a third aspect, the present application further provides a flexible load regulation method, including the following steps:
after receiving the emergency plan, the management end responds to the emergency plan and analyzes the index to generate an index decomposition scheme, and outputs decomposed pressure limiting indexes to be issued to the corresponding flexible load regulation and control devices; sending an early warning message to an emergency early warning device while issuing the partial pressure index;
the emergency early warning device carries out electricity limiting early warning after receiving the early warning message;
the flexible load regulation and control device outputs current regulation and control according to indexes issued by the management end so as to realize power regulation and control.
The sampling resistor limits the current of the circuit, the zero-crossing detection module detects the voltage and the current phase sequence of the alternating current after the current limiting, the signal is transmitted to the singlechip through the circuit, the singlechip controls the silicon controlled rectifier to realize the equivalent current size matched with the required duty ratio by using the PWM regulation technology, but the equivalent duty ratio effect of the voltage is required to be ensured during the period. Considering the situation that the load of the user side is variable, adopting a voltage-priority PWM regulation technology, namely taking the voltage and the current when the management end issues a voltage limiting task as reference voltage and current no matter whether the power of the user side is to be increased or decreased, taking the current in the issued task as reference or as reference, if the load of the user side is attempted to be increased, the implementation is impossible, because the reference current is issued and the voltage is not prioritized; if the load on the user side becomes smaller, it is just advantageous to press the load. The design not only can not cause loss of electric energy in the implementation process, but also can ensure electric quantity income of a power grid company, and more importantly, unnecessary loss of a user side can be reduced under special conditions, and the implementation is limited.
From the above technical scheme, the application has the following advantages:
the voltage and the current when the management end issues the voltage limiting task are reference voltage and current, the current in the issued task is used as reference or is used as reference, and if the load of the user side tries to become larger, the realization is impossible, because we issue the reference current, and the voltage does not become priority; if the load on the user side becomes smaller, it is just advantageous to press the load. The design not only can not cause loss to electric energy in the implementation process, ensure electric quantity income of a power grid company, but also can reduce unnecessary loss of a user side under special conditions, realize the dominant point of view of responsibility departments with limited preservation and global participation, and is convenient, accurate and flexible to implement.
In addition, the application has reliable design principle, simple structure and very wide application prospect.
It can be seen that the present application has outstanding substantial features and significant advances over the prior art, as well as its practical advantages.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic block diagram of a flexible load regulation device provided in one embodiment of the application.
Fig. 2 is a schematic block diagram of a zero crossing detection module according to one embodiment of the application.
Fig. 3 is a schematic block diagram of a system provided by one embodiment of the present application.
Detailed Description
The AC power utilization circuit is generally divided into three types of inductive, capacitive and resistive according to the power utilization load property, and current industrial enterprises have power rate adjustment indexes, so that the power factor is above 90%, and the PWM regulation technology is a circuit for realizing the same effect of current and voltage flowing in the same time through regulating the duty ratio. The direct application in ac circuits is rare, most of which are the rectification of ac power to dc power, and PWM regulation is more common. But the electrical energy lost by such a method is relatively large. The method of the application is to cut a waveform of alternating current into waveform segments with small enough time, then alternating current can be regarded as a small direct current in the waveform segments with small enough time, then direct current is used in the upper half or the lower half of the X axis, namely, the period of constant current direction of alternating current in a waveform is regarded as direct current in the period, by utilizing the principle, we can apply PWM regulation technology under the condition of no rectification, because the circuit is alternating current, a silicon controlled rectifier is used as a switch, and a sampling resistor is used as a necessary device for zero-crossing detection, the silicon controlled rectifier is used for converting an equivalent circuit of PWM duty ratio regulation in half alternating current waveform, in particular, the equivalent circuit of voltage-unchanged variable current and the equivalent of duty ratio regulation is realized, the end result is that the voltage is constant, the current can be regulated arbitrarily, and the power can be regulated arbitrarily. The sampling resistor is an accurate resistor, is often used for parameter sampling of a circuit, is actually used for detecting zero position of a phase sequence, and is used for judging and distinguishing a half waveform with unchanged direction in a complete alternating-current waveform.
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 1, the embodiment of the application provides a flexible load regulation device, which comprises a sampling resistor and a singlechip;
the sampling resistor is connected to the power supply secondary side line and used for limiting the current of the line;
the sampling resistor is connected with a zero-crossing detection module;
the zero-crossing detection module is connected with the singlechip and is used for carrying out zero-phase sequence detection on the alternating current signal output by the sampling resistor and outputting a zero-crossing signal to the singlechip;
the singlechip is connected with a primary side line inlet of power supply through a controllable silicon; the singlechip adjusts PWM to a primary side line inlet of power supply by controlling the on-off of the controllable silicon according to the zero crossing signal.
The singlechip obtains the zero crossing frequency according to the zero crossing signal output by the zero crossing detection module, further obtains the PWM frequency, sets the power ratio of the electrical appliance according to the received electricity limiting information, obtains the PWM duty ratio value according to the PWM duty ratio calculation method, configures PWM according to the PWM frequency and the calculated duty ratio value, and controls the opening and closing of the silicon controlled rectifier according to the PWM control method to realize the electricity limiting adjustment of the power of the electrical appliance.
It should be noted that the zero-crossing detection module of the present application may be a known zero-crossing detection module.
The sampling resistor limits the current of the circuit, the zero-crossing detection module detects the voltage and the current phase sequence of the alternating current after the current limiting, the signal is transmitted to the singlechip through the circuit, the singlechip controls the silicon controlled rectifier to realize the equivalent current size matched with the required duty ratio by using the PWM regulation technology, but the equivalent duty ratio effect of the voltage is required to be ensured during the period. Considering the situation that the load of the user side is variable, adopting a voltage-priority PWM regulation technology, namely taking the voltage and the current when the management end issues a voltage limiting task as reference voltage and current no matter whether the power of the user side is to be increased or decreased, taking the current in the issued task as reference or as reference, if the load of the user side is attempted to be increased, the implementation is impossible, because the reference current is issued and the voltage is not prioritized; if the load on the user side becomes smaller, it is just advantageous to press the load. The design not only can not cause loss of electric energy in the implementation process, but also can ensure electric quantity income of a power grid company, and more importantly, unnecessary loss of a user side can be reduced under special conditions, and the implementation is limited.
The application provides a flexible load control device, which can control the power of a user side by regulating and controlling the current of the user side on the basis of not changing the voltage of the user side, can complete the load limiting task, simultaneously avoid the excessive concentration of the load limiting task on a power consumer, realize that no matter how much power is used by the user, only the participation of the user is uniformly and proportionally participated in the load limiting, be fairly for the user, automatically calculate the load limiting and the power through a management terminal, automatically send down the load limiting strategy (namely proportional load limiting or non-proportional load limiting), complete all the works of the power grid in the early stage of emergency state load limiting, and be convenient, efficient, accurate and indiscriminate.
The embodiment of the application provides a flexible load regulation and control device, which comprises a sampling resistor and a singlechip;
the sampling resistor is connected to the power supply secondary side line and used for limiting the current of the line;
the sampling resistor is connected with a zero-crossing detection module;
the zero-crossing detection module is connected with the singlechip and is used for carrying out zero-phase sequence detection on the alternating current signal output by the sampling resistor and outputting a zero-crossing signal to the singlechip;
the singlechip is connected with a primary side line inlet of power supply through a controllable silicon; the singlechip adjusts PWM to a primary side line inlet of power supply by controlling the on-off of the controllable silicon according to the zero crossing signal.
The singlechip obtains the zero crossing frequency according to the zero crossing signal output by the zero crossing detection module, further obtains the PWM frequency, sets the power ratio of the electrical appliance according to the received electricity limiting information, obtains the PWM duty ratio value according to the PWM duty ratio calculation method, configures PWM according to the PWM frequency and the calculated duty ratio value, and controls the opening and closing of the silicon controlled rectifier according to the PWM control method to realize the electricity limiting adjustment of the power of the electrical appliance.
As shown in fig. 2, the zero-crossing detection module includes a photo coupler; the power supply secondary side line comprises an alternating current input L end and an alternating current input N end; the number of the photoelectric couplers is two, namely a first photoelectric coupler and a second photoelectric coupler;
the alternating current input end L is connected with a first end of the primary side of the first photoelectric coupler through a sampling resistor, and a second end of the primary side of the first photoelectric coupler is connected with the alternating current input end N;
the first end of the secondary side of the first photoelectric coupler is connected with a first power supply through a first resistor, and the second end of the secondary side of the first photoelectric coupler is grounded; the first end of the secondary side of the first photoelectric coupler is connected with the singlechip;
the alternating current input end L is connected with the second end of the primary side of the second photoelectric coupler through a sampling resistor, and the first end of the primary side of the second photoelectric coupler is connected with the alternating current input end N;
the first end of the secondary side of the second photoelectric coupler is connected to a first power supply through a second resistor, and the second end of the secondary side of the second photoelectric coupler is grounded; the first end of the second side of the second photoelectric coupler is connected with the singlechip.
According to the application, two photoelectric couplers are arranged, one photoelectric coupler is driven to be conducted according to the voltage of each half period of alternating current, the output signal of the photoelectric coupler is input to the singlechip, the singlechip receives a zero-crossing detection signal, the singlechip respectively regulates the upper half period and the lower half period of the alternating current according to the action of the received zero-crossing detection signal by controlling the silicon controlled rectifier, and the main circuit for regulating the duty ratio to the primary side is output by combining the electricity limiting information to realize the electricity limiting regulation.
It should be further noted that the zero crossing detection module further includes a compensation adjustment module for performing transformation adjustment on the waveform of the output signal of the photocoupler;
the compensation adjustment module comprises a first compensation adjustment module and a second compensation adjustment module;
the first end of the secondary side of the first photoelectric coupler is connected with the singlechip through a first compensation adjustment module;
the first end of the second side of the second photoelectric coupler is connected with the singlechip through a second compensation adjustment module.
Because the singlechip is a high-sensitivity singlechip, compensation adjustment is arranged to convert waveforms output by the photoelectric coupler in order to ensure that signals output by the photoelectric coupler to the singlechip do not influence the processing judgment of the singlechip. And carrying out phase delay compensation on the zero-crossing phase output to obtain the zero crossing point of the alternating voltage signal.
In some embodiments, the compensation adjustment module is a schmitt trigger, and the signal output by the photoelectric coupler is transformed and compensated by the schmitt trigger to output a zero crossing signal to the singlechip.
The application provides a flexible load control device, which can control the power of a user side by regulating and controlling the current of the user side on the basis of not changing the voltage of the user side, for example, the current of the user side is 600A, the power is 380 V.600A=228 kilowatts in normal production, and when the load needs to be regulated and controlled, the current of the user side can be regulated and controlled to 200A or lower through the device, so that the power of the user side reaches 380 V.200A=76 kilowatts, which is one third of the power in normal operation, the voltage limiting load task can be completed, meanwhile, the voltage limiting task is prevented from being excessively concentrated on a large user, no matter how much power is used by the user, the regulation and control task issued by a management function is received by the flexible load regulation and control device for limiting the power in a fair proportion for the user, and the flexible load regulation and control device is convenient, efficient, accurate and free from differential voltage limiting.
The main components of the application are thyristors (thyristors), the thyristors are mainly applied to alternating current circuits to realize on-off of the circuits, the high voltage, low current control, high current, quick response speed and long service life are realized, but a single electronic control cannot realize constant output voltage and controllable current, and PWM regulation technology is also needed, namely, the effect of equivalent current and voltage is realized through PWM regulation, namely duty ratio regulation, in the effective duration of the current and the voltage. The voltage and the current through the PWM regulation technology can realize voltage equivalent output, namely, the power consumption voltage of the user side electrical equipment is kept unchanged, and the power consumption current can theoretically realize any magnitude between 0 and normal power consumption current, so that the purpose of regulating and controlling the power of the power consumption side can be realized. A further advantage is the stability of the voltage, which is of vital importance, since too high or too low a voltage can lead to anomalies in the equipment on the power side, in particular too high a voltage can even have serious consequences, leading to damage to the equipment.
The device also comprises a regulation and control indicator lamp connected with the singlechip;
when the flexible load regulating device starts to operate for regulation, the singlechip controls the regulation indicator lamp to be lighted.
When the electricity limiting regulation task is received, the flexible load regulation device executes regulation, and a regulation indicator light of the flexible load regulation device is on, so that the staff can conveniently check and watch records.
The technical scheme of the application also provides a metering switch cabinet, which comprises the flexible load regulating device according to the embodiment;
the sampling resistor is connected to the secondary side line of the metering switch cabinet and used for limiting the current of the line;
the singlechip is connected with a primary side inlet end of the metering switch cabinet through a controllable silicon.
The flexible load regulation device is arranged in the metering switch cabinet, when electricity limiting is not needed, the flexible load regulation device in the metering switch cabinet is not started in normal operation, and when the electricity limiting task is received, the flexible load regulation device in the metering switch cabinet is started.
A current transformer is arranged in a secondary side line of the metering switch cabinet, and a sampling resistor is connected with a secondary side line of the current transformer;
the upper portion of the metering switch cabinet is provided with an electric energy meter.
When the input voltage of the metering switch cabinet is large, a current/voltage transformer is generally arranged on the secondary line side of the metering switch cabinet, and the acquisition resistor acquires an alternating current signal subjected to voltage reduction after passing through the transformer so as to ensure the safety of the flexible load regulation and control device.
As shown in fig. 3, the embodiment of the present application further provides a flexible load control system, which includes a metering switch cabinet and the flexible load control device described in the above embodiment connected to the metering switch cabinet;
the flexible load control device is connected with a management end;
the management end sends electricity limiting information to the flexible load regulation and control device;
the flexible load regulation device is connected with the secondary side line of the metering switch cabinet and used for collecting alternating current, detecting zero phase sequence of the collected alternating current signal, and PWM regulating and outputting the alternating current signal to the primary side main line inlet end of the metering switch cabinet according to the received electricity limiting information and zero-crossing signal detected and output by the zero phase sequence;
and the output end of the primary side main line of the metering switch cabinet is connected with a useful electrical appliance.
It should be noted that in the embodiment of the present application, the flexible load control device may be disposed inside the metering switch cabinet or may be disposed outside the metering switch cabinet, so that the use is not affected.
The system also comprises a transformer, wherein the power supply grid is connected with the input end of the transformer through an electric wire consumption line, and the output end of the transformer is connected with the inlet end of the primary side main line of the metering switch cabinet.
The system also comprises an emergency early warning device connected with the management end;
the management end is used for responding to the emergency plan after receiving the emergency plan, analyzing the index to generate an index decomposition scheme, outputting decomposed pressure limiting indexes and transmitting the decomposed pressure limiting indexes to the corresponding flexible load regulation and control devices; sending an early warning message to an emergency early warning device while issuing the partial pressure index;
and the emergency early warning device is used for carrying out electricity limiting early warning after receiving the early warning message.
In practice, after the management end receives the emergency plan, the analysis index generation index decomposition scheme selects the list of participating users to issue the pressure limiting index to the flexible load regulation device, and before issuing the pressure limiting index, the selection strategy is adjusted in proportion or not, and relevant information parameters of the whole pressure limiting regulation are sent to the flexible load regulation device. The control index is issued, early warning information is issued to the emergency early warning device, the emergency early warning device is arranged in a duty room, the early warning information can be sent to a mobile phone terminal of a responsible person, and in general, after the early warning information is received, the flexible load control device starts to operate.
In some cases, when large-area electricity limiting is needed, the number of the metering switch pairs connected with the management end can be multiple, and each metering switch cabinet is connected with a flexible load regulating device. The multi-region electricity limiting regulation and control can be realized.
The embodiment of the application also provides a flexible load regulation and control method, which comprises the following steps:
step 1: after receiving the emergency plan, the management end responds to the emergency plan and analyzes the index to generate an index decomposition scheme, outputs decomposed pressure limiting indexes, sends an early warning message to the emergency early warning device, and simultaneously issues the pressure limiting indexes to the corresponding flexible load regulation and control devices;
step 2, the emergency early warning device performs electricity limiting early warning after receiving the early warning message;
step 3: the flexible load regulation and control device outputs current regulation and control according to indexes issued by the management end so as to realize power regulation and control.
The sampling resistor limits the current of the circuit, the zero-crossing detection module detects the voltage and the current phase sequence of the alternating current after the current limiting, the signal is transmitted to the singlechip through the circuit, the singlechip controls the silicon controlled rectifier to realize the equivalent current size matched with the required duty ratio by using the PWM regulation technology, but the equivalent duty ratio effect of the voltage is required to be ensured during the period. Considering the situation that the load of the user side is variable, adopting a voltage-priority PWM regulation technology, namely taking the voltage and the current when the management end issues a voltage limiting task as reference voltage and current no matter whether the power of the user side is to be increased or decreased, taking the current in the issued task as reference or as reference, if the load of the user side is attempted to be increased, the implementation is impossible, because the reference current is issued and the voltage is not prioritized; if the load on the user side becomes smaller, it is just advantageous to press the load. The design not only can not cause loss of electric energy in the implementation process, but also can ensure electric quantity income of a power grid company, and more importantly, unnecessary loss of a user side can be reduced under special conditions, and the implementation is limited.
Although the present application has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present application is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present application by those skilled in the art without departing from the spirit and scope of the present application, and it is intended that all such modifications and substitutions be within the scope of the present application/be within the scope of the present application as defined by the appended claims. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (2)
1. The flexible load regulation and control system is characterized by comprising a metering switch cabinet and a flexible load regulation and control device connected with the switch cabinet;
the flexible load control device is connected with a management end;
the management end sends electricity limiting information to the flexible load regulation and control device;
the flexible load regulation device is connected with the secondary side line of the metering switch cabinet and used for collecting alternating current, detecting zero phase sequence of the collected alternating current signal, and PWM regulating and outputting the alternating current signal to the primary side main line inlet end of the metering switch cabinet according to the received electricity limiting information and zero-crossing signal detected and output by the zero phase sequence;
the primary side main line output end of the metering switch cabinet is connected with a useful electrical appliance;
the number of the metering switch cabinets is a plurality of;
each metering switch cabinet is connected with a flexible load regulating device;
the system also comprises an emergency early warning device connected with the management end;
the management end is used for responding to the emergency plan after receiving the emergency plan, analyzing the index to generate an index decomposition scheme, outputting decomposed pressure limiting indexes and transmitting the decomposed pressure limiting indexes to the corresponding flexible load regulation and control devices; sending an early warning message to an emergency early warning device while issuing the partial pressure index;
the emergency early warning device is used for carrying out electricity limiting early warning after receiving the early warning message;
the flexible load regulating device comprises a sampling resistor and a singlechip;
the sampling resistor is connected to the secondary side line of the metering switch cabinet and used for limiting the current of the line; a current transformer is arranged in a secondary side line of the metering switch cabinet, and a sampling resistor is connected with a secondary side line of the current transformer;
an electric energy meter is arranged at the upper part of the metering switch cabinet;
the sampling resistor is connected with a zero-crossing detection module;
the zero-crossing detection module is connected with the singlechip and is used for carrying out zero-phase sequence detection on the alternating current signal output by the sampling resistor and outputting a zero-crossing signal to the singlechip;
the singlechip is connected with a primary side inlet end of the metering switch cabinet through a silicon controlled rectifier; the singlechip adjusts PWM to a primary side input end of the power supply by controlling the on-off of the silicon controlled rectifier according to the zero crossing signal;
the zero-crossing detection module comprises a photoelectric coupler; the power supply secondary side line comprises an alternating current input L end and an alternating current input N end; the number of the photoelectric couplers is two, namely a first photoelectric coupler and a second photoelectric coupler;
the alternating current input end L is connected with a first end of the primary side of the first photoelectric coupler through a sampling resistor, and a second end of the primary side of the first photoelectric coupler is connected with the alternating current input end N;
the first end of the secondary side of the first photoelectric coupler is connected with a first power supply through a first resistor, and the second end of the secondary side of the first photoelectric coupler is grounded; the first end of the secondary side of the first photoelectric coupler is connected with the singlechip;
the alternating current input end L is connected with the second end of the primary side of the second photoelectric coupler through a sampling resistor, and the first end of the primary side of the second photoelectric coupler is connected with the alternating current input end N;
the first end of the secondary side of the second photoelectric coupler is connected to a first power supply through a second resistor, and the second end of the secondary side of the second photoelectric coupler is grounded; the first end of the secondary side of the second photoelectric coupler is connected with the singlechip;
the zero crossing detection module further comprises a compensation adjustment module for performing transformation adjustment on the waveform of the output signal of the photoelectric coupler;
the compensation adjustment module comprises a first compensation adjustment module and a second compensation adjustment module;
the first end of the secondary side of the first photoelectric coupler is connected with the singlechip through a first compensation adjustment module;
the first end of the secondary side of the second photoelectric coupler is connected with the singlechip through a second compensation adjustment module;
the device also comprises a regulation and control indicator lamp connected with the singlechip;
when the flexible load regulation and control device starts to operate for regulation and control, the singlechip controls the regulation and control indicator lamp to be lightened;
the specific regulation and control process is as follows:
after receiving the emergency plan, the management end responds to the emergency plan and analyzes the index to generate an index decomposition scheme, and outputs decomposed pressure limiting indexes to be issued to the corresponding flexible load regulation and control devices; sending an early warning message to an emergency early warning device while issuing the partial pressure index;
the emergency early warning device carries out electricity limiting early warning after receiving the early warning message;
the flexible load regulation and control device outputs current regulation and control according to indexes issued by the management end so as to realize power regulation and control.
2. A flexible load control method based on the flexible load control system of claim 1, comprising the steps of:
after receiving the emergency plan, the management end responds to the emergency plan and analyzes the index to generate an index decomposition scheme, and outputs decomposed pressure limiting indexes to be issued to the corresponding flexible load regulation and control devices; sending an early warning message to an emergency early warning device while issuing the partial pressure index;
the emergency early warning device carries out electricity limiting early warning after receiving the early warning message;
the flexible load regulation and control device outputs current regulation and control according to indexes issued by the management end so as to realize power regulation and control.
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| CN202310257456.5A CN116014730B (en) | 2023-03-17 | 2023-03-17 | Flexible load regulation and control device, system and regulation and control method |
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