CN116845934A - Power distribution circuit system - Google Patents
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- CN116845934A CN116845934A CN202311123133.3A CN202311123133A CN116845934A CN 116845934 A CN116845934 A CN 116845934A CN 202311123133 A CN202311123133 A CN 202311123133A CN 116845934 A CN116845934 A CN 116845934A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the technical field of power supply and distribution of a power grid, in particular to a distribution circuit system which comprises a power generation module, a first power transformation module connected with the power generation module, a second power transformation module connected with the first power transformation module, a power distribution module connected with the second power transformation module, a power consumption module connected with the power distribution module and an energy storage module; the invention adopts the statistics of electricity consumption data of a distribution area in advance, according to the transmission loss of the distribution area, the historical electricity consumption data of the same period of the distribution area, the power supply request in the future time of the distribution area and the redundant electricity distribution amount designed in the distribution area, the invention carries out metering power generation on the redundant electricity distribution amount, after power generation, electric energy is transmitted to the electricity consumption area, monitors the current actual electricity consumption power of the electricity consumption area in real time, and stores the rest electric energy into the energy storage module according to the electricity consumption power.
Description
Technical Field
The invention relates to the technical field of power supply and distribution of power grids, in particular to a distribution circuit system.
Background
Low carbon and environmental protection, energy conservation, effective reduction of carbon dioxide, reduction of global warming speed and earth environment protection. In the current power grid, generally, the generated power of the power generation equipment in unit time is constant, the electricity consumption in the power supply range of the power plant floats at any time, especially at night, the electricity consumption is low-peak, and the surplus electric energy can only be wasted if the surplus electric energy is not stored. This is not in compliance with current energy saving policies. The storage of electric energy in the power grid is a major difficulty, and the current mode of converting the electric energy into other energy sources is adopted to consume redundant electric energy, and other energy sources are utilized to produce the electric energy during use, such as storage batteries, pumping and storing energy, super-capacitor storing energy, flywheel storing energy and the like. However, these energy storage modes all require a certain floor space. If the power grid provides excessive surplus electric energy, more equipment is needed for energy storage, and certain energy storage cost pressure exists.
In the current power generation mode for supplying power to a power grid, clean energy sources such as nuclear power, wind power and photovoltaic power generation are not needed, and in places adopting thermal power generation and hydroelectric power generation, the clean energy sources do not generate power according to actual power consumption requirements of power supply areas, so that certain cost pressure is caused when redundant electric energy is stored, and more energy storage devices are needed. Therefore, there is a need for a power distribution circuit system that can supply power on demand, and that reduces the amount of excess power to mitigate the cost of the energy storage device, based on the actual demand in the power supply area.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a power distribution circuit system which enables a power plant to generate power according to the actual requirements of a power supply area, has an energy storage function, and can save power generation energy and energy storage equipment for storing redundant electric energy.
The technical scheme adopted by the invention is as follows: the power distribution circuit system comprises a power generation module, a first power transformation module connected with the power generation module, a second power transformation module connected with the first power transformation module, a power distribution module connected with the second power transformation module, a power consumption module connected with the power distribution module and an energy storage module; the power generation module, the first power transformation module, the second power transformation module, the power distribution module, the power utilization module and the energy storage module are in communication connection with each other;
the power generation module adopts metering type power generation, and the metering method comprises the following steps:
s1, acquiring electricity consumption data of a power distribution area;
s2, performing feature processing on the data;
s3, calculating the generated energy;
the power distribution module adopts metering type power distribution, and the metering method comprises the following steps:
a1, setting a critical value of output power of the second power transformation module, and recording values of voltage U1 and current I1 output at the moment;
a2, judging whether the current actual power reaches a critical value or not;
a3, according to the judgment result of the A2, if the critical value is not reached, the power distribution module transmits the electric energy obtained by subtracting the current actual electric power from the critical value to the energy storage module, and if the critical value is reached, the current power distribution mode is kept unchanged;
a4, after the power distribution module transmits the electric energy obtained by subtracting the current actual electric power from the critical value to the energy storage module, if the current actual electric power is increased, overload occurs, and at the moment, the values of the output voltage U2 and the output current I2 of the second power transformation module are different from the values of the voltage U1 and the current I1 in the critical value state, and at the moment, the electric energy transmitted to the energy storage module by the power distribution module is reduced until the values of the output voltage U2 and the output current I2 of the second power transformation module are the same as the values of the voltage U1 and the current I1 in the critical value state;
a5, repeating the steps A2-A4 according to the period.
Furthermore, the power generation module is a thermal power station or a hydropower station, and can generate power by fossil fuel, such as gasoline, diesel oil and the like.
Further, the power distribution module comprises a controller and a plurality of shunt switches electrically connected with the controller, and the power utilization module and the energy storage module are controlled to be switched on and off by the corresponding shunt switches.
It should be noted that the electricity consumption module is an electricity consumption terminal, such as an interface of municipal electricity consumption, factory production electricity consumption, resident electricity consumption, etc.
Further, the energy storage module is one or more of a pumping energy storage module, a battery energy storage module, a super capacitor energy storage module, a flywheel energy storage module, a temperature energy storage module, a hydrogen energy storage module, a superconducting magnetic energy storage or compressed air energy storage module. It is worth to say that, if the water pumping energy storage module is used for pumping redundant electric energy to the water pump, pumping water at the ground to the high place, converting the electric energy into gravitational potential energy of water, and releasing the electric energy from the high place to generate electricity when electricity is used in a peak; the battery energy storage module and the super capacitor energy storage module directly store electric energy; the flywheel energy storage module converts electric energy into kinetic energy of a flywheel in the device, and the kinetic energy returns to electric energy in a certain mechanism, so that energy is stored in the way; the compressed air energy storage module adopts a compressed air mode and releases the compressed air energy storage module to enable the compressed air energy storage module to be similar to wind power generation; the temperature energy storage module comprises a heating storage mode and a freezing storage mode, various resources which can convert electric energy into temporary storage are released when electricity is used up in a peak so as to relieve the voltage.
Further, the electricity consumption data in step S1 includes transmission loss from the power generation module to the distribution area, historical electricity consumption data of the same period of the distribution area, power supply request in future time of the distribution area, and redundant electricity distribution amount designed by the distribution area. The transmission loss from the power generation module to the distribution area comprises loss on a power transmission line, loss of a first power transformation module and a second power transformation module (mainly transformers), leakage loss, dielectric magnetization loss and dielectric polarization loss; historical electricity consumption data of the power distribution area in the same period is the electricity consumption data used by the power distribution area in a certain day at a certain room temperature; the power supply request in the future time of the power distribution area mainly includes a factory with large power consumption requirement, such as a factory which needs to be started for production or a production line to be newly started at a certain time, and a large amount of electric energy is needed at the moment; the redundant power distribution quantity designed in the power distribution area is to ensure that the lack of power is avoided as much as possible, and a part of redundant power supply quantity is increased in the total power consumption range of the power distribution area.
Further, in the method for performing feature processing on the data in step S2, the transmission loss, the historical electricity consumption data in the same period, the power supply request amount in the future time of the power distribution area and the redundant power distribution amount are added to obtain the total electric energy. It should be noted that the total amount of electrical energy obtained here should be a power that varies with time, ensuring that the generated power per period should be consistent with the calculated total amount of electrical energy.
Further, in step A1, the critical value of the output power of the second power transformation module is a value obtained by subtracting the transmission loss from the total electric quantity generated by the power generation module, and the maximum rated output power of the second power transformation module should be greater than the power of the critical value.
Further, the first power transformation module and the second power transformation module adopt transformers.
The beneficial effects are that:
the power distribution circuit system provided by the invention adopts the power consumption data of the power distribution area which are counted in advance, and the power is generated in a metering mode according to the transmission loss of the power distribution area, the historical power consumption data of the same period of the power distribution area, the power supply request in the future time of the power distribution area and the redundant power distribution quantity designed in the power distribution area. Meanwhile, after power generation, electric energy is transmitted to an electricity utilization area, the current actual electricity utilization power of the electricity utilization area is monitored in real time, and the rest electric energy is stored in an energy storage module according to the electricity utilization power, so that the energy storage system has the characteristics of saving resources and saving electric energy.
Drawings
FIG. 1 is a schematic diagram of a power distribution circuit system according to the present invention;
FIG. 2 is a step diagram of metering power generation in a power distribution circuit system according to the present invention;
fig. 3 is a block diagram of a metering power distribution flow in a power distribution circuit system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
The power distribution circuit system comprises a power generation module, a first power transformation module connected with the power generation module, a second power transformation module connected with the first power transformation module, a power distribution module connected with the second power transformation module, a power consumption module connected with the power distribution module and an energy storage module, wherein the power distribution module is connected with the power distribution module; the power generation module, the first power transformation module, the second power transformation module, the power distribution module, the power utilization module and the energy storage module are in communication connection with each other;
the power generation module adopts metering type power generation, and the metering method comprises the following steps:
s1, acquiring electricity consumption data of a power distribution area;
s2, performing feature processing on the data;
s3, calculating the generated energy;
the power distribution module adopts metering type power distribution, and the metering method comprises the following steps:
a1, setting a critical value of output power of the second power transformation module, and recording values of voltage U1 and current I1 output at the moment;
a2, judging whether the current actual power reaches a critical value or not;
a3, according to the judgment result of the A2, if the critical value is not reached, the power distribution module transmits the electric energy obtained by subtracting the current actual electric power from the critical value to the energy storage module, and if the critical value is not reached, the current power distribution mode is kept unchanged;
a4, after the power distribution module transmits the electric energy obtained by subtracting the current actual electric power from the critical value to the energy storage module, if the current actual electric power is increased, overload occurs, and at the moment, the values of the output voltage U2 and the output current I2 of the second power transformation module are different from the values of the voltage U1 and the current I1 in the critical value state, and at the moment, the electric energy transmitted to the energy storage module by the power distribution module is reduced until the values of the output voltage U2 and the output current I2 of the second power transformation module are the same as the values of the voltage U1 and the current I1 in the critical value state;
a5, repeating the steps A2 to A4 according to the period.
In this embodiment, the power generation module is a thermal power station or a hydropower station, and may of course also generate power by fossil fuel, such as gasoline, diesel, and the like.
In this embodiment, the power distribution module includes a controller, and a plurality of shunt switches connected with the controller through electrical signals, and the power consumption module and the energy storage module are controlled by the corresponding shunt switches to switch on/off of the circuit.
It should be noted that the electricity consumption module is an electricity consumption terminal, such as an interface of municipal electricity consumption, factory production electricity consumption, resident electricity consumption, etc.
In this embodiment, the energy storage module is one or more of a pumping energy storage module, a battery energy storage module, a super capacitor energy storage module, a flywheel energy storage module, a temperature energy storage module, a hydrogen energy storage module, a superconducting magnetic energy storage or a compressed air energy storage module. It is worth to say that, if the water pumping energy storage module is used for pumping redundant electric energy to the water pump, pumping water at the ground to the high place, converting the electric energy into gravitational potential energy of water, and releasing the electric energy from the high place to generate electricity when electricity is used in a peak; compared with a conventional capacitor, the super capacitor energy storage module has higher dielectric constant, larger surface area or higher voltage withstand capability. The super capacitor is expensive, and is mostly used for occasions with short time, high-power load smoothing and high peak power of electric energy quality in an electric power system, such as starting support of a high-power direct-current motor, a dynamic voltage restorer and the like, and the power supply level is improved during voltage sag and transient interference; the battery energy storage module is a battery energy storage system and is mainly charged and discharged by utilizing the oxidation-reduction reaction of the anode and the cathode of the battery. Mainly comprises a lead-acid battery, a nickel-cadmium battery, a lithium ion battery, a sodium-sulfur battery, a full alum flow battery and the like. The current energy storage capacity of the lead-acid battery reaches 20MW, and the lead-acid battery provides a closing power supply for the circuit breaker when the power system operates normally; the flywheel energy storage module consists of a cylindrical rotating mass block and a mechanism supported by a magnetic suspension bearing, the flywheel system operates in an environment with higher vacuum degree, and the flywheel is connected with a motor or a generator. When the load is in a valley value, the flywheel energy storage system is powered by a power frequency power grid to drive the flywheel to rotate at a high speed, and energy is stored in a kinetic energy form; when in peak load, the flywheel rotating at high speed is used as a prime motor to drag the motor to generate electricity, and current and voltage are output through the power converter, so that the conversion of mechanical energy and electric energy is completed. The flywheel has excellent recycling and load tracking performances, and is mainly used for uninterrupted power supply/emergency power supply, power grid peak shaving and frequency control; the compressed air energy storage module compressed air energy storage power station (CAES) is a peak shaving gas turbine power station, mainly uses the surplus power generated during the low load of the power grid to compress air, stores the air in a high-pressure sealing facility with the typical pressure of 7.5MPa, and releases the air at the peak of power consumption to drive the gas turbine to generate power. For the same output, it consumes 40% less gas than a conventional gas turbine. The construction investment and the power generation cost of the compressed air energy storage power station are lower than those of the pumped storage power station, but the energy density is low and is limited by the terrain conditions such as rock stratum and the like. The compressed air energy storage power station can be started in a cold mode and a black mode, has high response speed, and is mainly used for peak-valley electric energy recovery adjustment, balanced load, frequency modulation and distributed energy storage and power generation system standby; the temperature energy storage module comprises a heating storage mode and a freezing storage mode, various resources which can convert electric energy into temporary storage can be released when electricity is used up in a peak so as to relieve the voltage; hydrogen energy storage module hydrogen energy storage is the primary form of fuel cell. The charge and discharge are redox reactions and chemical energy storage, except superconductors and supercapacitors which directly store electromagnetic field energy, other superconducting magnetic energy storage is to convert electric energy into other forms of energy for storage, and a superconducting magnetic energy storage system (superconducting magneticEnergy storage, SMES) stores magnetic field energy by utilizing coils made of superconductors, so that the superconducting magnetic energy storage system has quick electromagnetic response characteristics and high energy storage efficiency. The superconducting magnetic energy storage can meet the requirements of voltage support, power compensation, frequency adjustment, system stability improvement, power transmission capacity and the like of transmission and distribution networks. Compared with other energy storage technologies, the current superconducting magnetic energy storage is still expensive, and besides the cost of the superconducting magnet, the cost required for maintaining the low temperature is considerable. Meanwhile, it is worth to say that the final connection of the energy storage module is also an electric appliance or a super capacitor and the like, and the electric energy is stored after being converted by the electric appliance.
In this embodiment, the electricity consumption data in step S1 includes transmission loss from the power generation module to the distribution area, historical electricity consumption data of the same period of the distribution area, power supply request in future time of the distribution area, and redundant electricity distribution amount designed in the distribution area. The transmission loss from the power generation module to the distribution area comprises loss on a power transmission line, loss of a first power transformation module and a second power transformation module (mainly transformers), leakage loss, dielectric magnetization loss and dielectric polarization loss; historical electricity consumption data of the power distribution area in the same period is the electricity consumption data used by the power distribution area in a certain day at a certain room temperature; the power supply request in the future time of the power distribution area mainly includes a factory with large power consumption requirement, such as a factory which needs to be started for production or a production line to be newly started at a certain time, and a large amount of electric energy is needed at the moment; the redundant power distribution quantity designed in the power distribution area is to ensure that the lack of power is avoided as much as possible, and a part of redundant power supply quantity is increased in the total power consumption range of the power distribution area.
In this embodiment, the method for performing feature processing on the data in step S2 is to add transmission loss, historical power consumption data in the same period, power supply request amount in future time of the power distribution area, and redundant power distribution amount, so as to obtain the total power. It should be noted that the total amount of electrical energy obtained here should be a power that varies with time, ensuring that the generated power per period should be consistent with the calculated total amount of electrical energy.
In this embodiment, the critical value of the output power of the second power transformation module in the step A1 is a value obtained by subtracting the transmission loss from the total electric quantity generated by the power generation module, and the maximum rated output power of the second power transformation module should be greater than the power of the critical value.
In the embodiment, the first power transformation module and the second power transformation module adopt transformers, specifically, after the power generation module generates power, the first power transformation module is adopted to raise the voltage of the alternating current obtained by the power generation module and convert the voltage into direct current to be high, and loss can be reduced when the alternating current is transmitted to the second power transformation module; and the second power transformation module converts the direct current into alternating current and reduces the voltage.
It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The power distribution circuit system is characterized by comprising a power generation module, a first power transformation module connected with the power generation module, a second power transformation module connected with the first power transformation module, a power distribution module connected with the second power transformation module, a power consumption module connected with the power distribution module and an energy storage module; the power generation module, the first power transformation module, the second power transformation module, the power distribution module, the power utilization module and the energy storage module are in communication connection with each other;
the power generation module adopts metering type power generation, and the metering method comprises the following steps:
s1, acquiring electricity consumption data of a power distribution area;
s2, performing feature processing on the data;
s3, calculating the generated energy;
the power distribution module adopts metering type power distribution, and the metering method comprises the following steps:
a1, setting a critical value of output power of the second power transformation module, and recording values of voltage U1 and current I1 output at the moment;
a2, judging whether the current actual power reaches a critical value or not;
a3, according to the judgment result of the A2, if the critical value is not reached, the power distribution module transmits the electric energy obtained by subtracting the current actual electric power from the critical value to the energy storage module, and if the critical value is reached, the current power distribution mode is kept unchanged;
a4, after the power distribution module transmits the electric energy obtained by subtracting the current actual electric power from the critical value to the energy storage module, if the current actual electric power is increased, overload occurs, and at the moment, the values of the output voltage U2 and the output current I2 of the second power transformation module are different from the values of the voltage U1 and the current I1 in the critical value state, and at the moment, the electric energy transmitted to the energy storage module by the power distribution module is reduced until the values of the output voltage U2 and the output current I2 of the second power transformation module are the same as the values of the voltage U1 and the current I1 in the critical value state;
a5, repeating the steps A2-A4 according to the period.
2. A power distribution circuitry as recited in claim 1, wherein: the power generation module is a thermal power station or a hydropower station.
3. A power distribution circuitry as recited in claim 1, wherein: the power distribution module comprises a controller and a plurality of shunt switches electrically connected with the controller, and the power utilization module and the energy storage module are controlled to be switched on and off by corresponding shunt switches.
4. A power distribution circuitry as recited in claim 1, wherein: the energy storage module is one or more of a pumping energy storage module, a battery energy storage module, a super capacitor energy storage module, a flywheel energy storage module, a temperature energy storage module and a compressed air energy storage module.
5. A power distribution circuitry as recited in claim 1, wherein: the electricity consumption data in the step S1 comprise transmission loss from the power generation module to the distribution area, historical electricity consumption data of the same period of the distribution area, power supply requests in future time of the distribution area and redundant electricity distribution quantity designed in the distribution area.
6. A power distribution circuitry as recited in claim 1, wherein: the method for performing feature processing on the data in the step S2 is to add transmission loss, historical electricity consumption data in the same period, power supply request quantity in future time of a power distribution area and redundant power distribution quantity to obtain total electric energy.
7. A power distribution circuitry as recited in claim 1, wherein: in the step A1, the critical value of the output power of the second power transformation module is a value obtained by subtracting the transmission loss from the total electric quantity generated by the power generation module, and the maximum rated output power of the second power transformation module should be greater than the power of the critical value.
8. A power distribution circuitry as recited in claim 1, wherein: the first power transformation module and the second power transformation module adopt transformers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117077978A (en) * | 2023-10-11 | 2023-11-17 | 浙江浙能能源服务有限公司 | Trans-regional new energy storage method and system |
| CN117273988A (en) * | 2023-11-23 | 2023-12-22 | 国网信通亿力科技有限责任公司 | Intelligent energy management system based on cross-business field |
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