CN109755938B - Active power distribution network and control method thereof - Google Patents
Active power distribution network and control method thereof Download PDFInfo
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- CN109755938B CN109755938B CN201910064241.5A CN201910064241A CN109755938B CN 109755938 B CN109755938 B CN 109755938B CN 201910064241 A CN201910064241 A CN 201910064241A CN 109755938 B CN109755938 B CN 109755938B
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Abstract
The disclosure relates to an active power distribution network and a control method thereof. The active power distribution network includes: the micro-grids comprise power generation devices, heating devices, refrigeration devices, distributed power storage devices, distributed heat storage devices and distributed cold storage devices and are used for supplying energy to a plurality of first energy loads which are connected in a one-to-one correspondence manner; and the control system is connected with the micro-grids and is used for controlling the conversion and transmission of energy in each device of the micro-grids. Compared with a control mode mainly based on electric power in a traditional active power distribution network, the active power distribution network with multiple complementary functions provided by the disclosure has the advantages that the adjusting capacity and range of the active power distribution network are improved, the demand side response of electricity, cold and heat cooperation is utilized, and the ordering of participation of the demand side in distribution network scheduling is enhanced.
Description
Technical Field
The disclosure relates to the field of energy Internet, in particular to an active power distribution network and a control method thereof.
Background
In recent years, with the increasing prominence of energy shortage and environmental problems, new energy power Generation technology is rapidly developed under the strong support of national policies, a large number of new energy power Generation devices are connected into a power grid in a Distributed Generation (DG) mode, and the power grid is challenged in the aspects of power quality, planning, operation, control and the like while the pressure of the power grid is relieved.
After a large amount of DGs are connected into a traditional power grid, the power grid is not a power distribution network only with unidirectional transmission of energy of power loads, but a power supply and the power loads coexist, and the energy flows bidirectionally or even in multiple directions. The traditional dispatching, controlling and managing method of the power grid needs to be updated to adapt to the new situation.
Active Distribution Networks (AND) are advanced stage technology forms of smart Distribution Networks, AND the basic definition AND composition thereof are widely accepted by the international academic community AND the industry at present.
The popularization and application of the active power distribution network can greatly improve the compatibility of a power grid to green energy and the high efficiency of existing asset utilization, and the development trend of the future intelligent power distribution network is realized. The research of the active distribution network in the aspects of theory and technology is not earnestly done, and some key problems to be solved still need to be researched and discussed.
Disclosure of Invention
The invention aims to provide an efficient and energy-saving active power distribution network and a control method thereof.
In order to achieve the above object, the present disclosure provides an active power distribution network. The active power distribution network comprises: the micro-grids comprise power generation devices, heating devices, refrigeration devices, distributed power storage devices, distributed heat storage devices and distributed cold storage devices and are used for supplying energy to a plurality of first energy loads which are connected in a one-to-one correspondence manner; and the control system is connected with the micro-grids and is used for controlling the conversion and transmission of energy in each device of the micro-grids.
Optionally, any two piconets are connected to each other, and the control system includes: and the interconnection device is respectively connected with each micro-grid and is used for controlling the circulation of energy among the micro-grids.
Optionally, the control system comprises: and each microgrid is connected with an external power grid through the corresponding grid-connected device, and each grid-connected device is used for connecting or disconnecting the corresponding microgrid and the corresponding second energy load to or from the external power grid.
Optionally, each grid-connected device is further configured to connect or disconnect the corresponding second energy load to or from the corresponding microgrid.
Optionally, the active power distribution network further includes: and the centralized energy storage device comprises a centralized electricity storage device, a centralized heat storage device and a centralized cold storage device, is connected with the micro grids and is used for supplying energy for the first energy loads and the second energy loads.
The disclosure also provides a control method of the active power distribution network. The method comprises the following steps: acquiring energy consumption amounts of a plurality of first energy loads; and controlling the conversion and transmission of energy in each device of the micro-grids according to the energy consumption of the first energy loads, wherein each micro-grid comprises a power generation device, a heating device, a refrigeration device, a distributed power storage device, a distributed heat storage device and a distributed cold storage device, and the micro-grids are used for supplying energy for the first energy loads connected in a one-to-one correspondence manner.
Optionally, the step of controlling the conversion and transmission of energy in the devices of the plurality of piconets according to the energy consumption of the first energy loads comprises: when the output of the power generation device is larger than the power consumption of the corresponding first energy load, controlling the corresponding distributed power storage device to store the residual power; when the output of the power generation device is greater than the power consumption of the corresponding first energy load and the electric quantity stored in the corresponding distributed power storage device reaches a preset quantity, controlling the heating device to convert the generated residual electric quantity into the heat energy required by the first energy load, or controlling the refrigerating device to convert the generated residual electric quantity into the cold energy required by the first energy load; when the output of the power generation device is larger than the power consumption of the corresponding first energy load, the electric quantity stored by the corresponding distributed power storage device reaches a preset quantity, and the hot energy and the cold energy required by the first energy load are supplied by the heating device and the refrigerating device, the distributed power storage device is controlled to store the hot energy converted from the residual electric quantity, or the distributed power storage device is controlled to store the cold energy converted from the residual electric quantity.
Optionally, the step of controlling the conversion and transmission of energy in the devices of the plurality of piconets according to the energy consumption of the first energy loads comprises: when the external power grid indicates that the electric load is reduced, controlling the heating device and the refrigerating device to reduce the running power; when the external power grid indicates to reduce the power load and the heating device and the refrigerating device stop running, controlling to increase the output of the distributed heat storage device and the distributed cold storage device; and when the external power grid indicates that the power load is reduced, the heating device and the refrigerating device stop running, and the energy sources in the distributed heat storage device and the distributed cold storage device are completely output, controlling the power generation device to increase the running power.
Optionally, each microgrid is connected to a corresponding second energy load through a corresponding grid-connected device, and the step of controlling conversion and transmission of energy in each device of the plurality of microgrids according to the energy consumption of the plurality of first energy loads further includes: and when the external power grid indicates to reduce the power load, the heating device and the refrigerating device stop operating, the energy sources in the distributed heat storage device and the distributed heat storage device are completely output, and the operating power of the power generation device reaches the preset power, controlling to cut off the energy source supply to the second energy load.
Optionally, the active power distribution grid further comprises a centralized energy storage device, and the step of controlling the conversion and transmission of energy in each of the devices of the plurality of piconets according to the energy consumption of the first energy loads comprises: controlling the distributed electric storage device, the distributed heat storage device and the distributed cold storage device to operate at a predetermined power; and controlling the running state of the centralized energy storage device according to the energy consumption amount of the first energy load.
Through the technical scheme, the active power distribution network with multiple complementary functions is provided, compared with a control mode which mainly uses electric power in the traditional active power distribution network, the adjusting capacity and the adjusting range of the active power distribution network are improved, the power, cold and heat cooperative demand side response is utilized, and the orderliness of participation of the demand side in distribution network scheduling is enhanced.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
fig. 1 is a block diagram of an active power distribution network according to an exemplary embodiment;
fig. 2 is a schematic structural diagram of an active power distribution network provided in an exemplary embodiment;
FIG. 3 is a flow chart of a method for controlling an active power distribution network in accordance with an exemplary embodiment;
fig. 4 is a schematic structural diagram of an active power distribution network according to another exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram of an active power distribution network according to an exemplary embodiment. As shown in fig. 1, the active power distribution grid may include a plurality of micro-grids and a control system.
Each micro-grid comprises a power generation device, a heating device, a refrigeration device, a distributed power storage device, a distributed heat storage device and a distributed cold storage device, and the power generation device, the heating device, the refrigeration device, the distributed power storage device, the distributed heat storage device and the distributed cold storage device are used for supplying energy for a plurality of first energy loads which are connected in a one-to-one correspondence mode. The control system is connected with the micro-grids and used for controlling the conversion and transmission of energy in each device of the micro-grids.
The micro-grid comprises a cold source, a heat source and a power source, is connected with a cold load, a heat load and an electric load, has multiple functions of distributed heat storage, distributed Chu Lenghe distributed electricity storage and the like, and has the functions of demand side management and control.
The control system can realize the functions of energy intelligent control scheduling and fault handling between the active power distribution network and an external power network, between the micro-grids, and between the internal capacity of the micro-grid and the energy consumption and the energy storage.
As shown before, the traditional active power distribution network is based on electricity, and compared with the traditional active power distribution network, the traditional active power distribution network disclosed by the disclosure is additionally provided with a heating device, a refrigerating device, a distributed heat storage device and a distributed cold storage device. Therefore, the intelligent control of multi-energy complementation, and multi-energy coordination of cold, heat and power supply can be realized. Compared with a control mode taking electric power as a main part in the traditional active power distribution network, the regulation capacity and the range of the active power distribution network are improved, and the order of participation of a demand side in distribution network scheduling is enhanced by utilizing the demand side response of electricity, cold and heat in coordination.
Fig. 2 is a schematic structural diagram of an active power distribution network according to an exemplary embodiment. As shown in fig. 2, any two piconets may be connected to each other. The control system may include an interconnection device. And the interconnection device is respectively connected with each micro-grid and is used for controlling the circulation of energy among the micro-grids.
The interconnection device has the functions of metering, protecting, controlling and synchronizing, and realizes interconnection and intercommunication of energy and information among the micro-grids.
By adopting a mode of interconnection and intercommunication complementation of a plurality of micro-grids, the scheduling capability of a power supply and a heat source in the grid-connected and off-grid operation processes can be improved, and the stability and the reliability of a power distribution network are improved. In the grid-connected process, in order to reduce grid-connected points, a plurality of microgrid collecting lines can be adopted for single-point grid connection, so that the management range of a large power grid can be reduced. Under the conditions of planned or unplanned off-grid, interconnection devices are arranged at interconnection positions of the micro-grids, have the functions of metering, protection, measurement, synchronization, switching and the like, realize flexible topological structure and distributed power generation and load transfer, and a plurality of micro-grids and centralized energy storage can be arbitrarily interconnected into a larger micro-grid in an off-grid state to form a more stable micro-grid supported by a plurality of distributed power supplies and heat sources.
In the embodiment of fig. 2, the control system may further include a plurality of grid-connected devices connected to the plurality of micro grids in a one-to-one correspondence. Each micro-grid is connected with the corresponding second energy load through the corresponding grid-connected device, each micro-grid is connected with the external power grid through the corresponding grid-connected device, and each grid-connected device is used for connecting or disconnecting the corresponding micro-grid and the corresponding second energy load to or from the external power grid.
The grid-connected device is a control unit which integrates functions of metering, protection, control, PCC (Point of Common Coupling), synchronization and ATS (Automatic transfer switching equipment), and realizes grid-connected or off-grid operation of a single microgrid and an active power distribution network. Grid-connected devices can be arranged at grid-connected points of each microgrid and grid-connected points of a collection line of the system, have the functions of metering, protection, control, PCC, interlocking switches and the like, and can perform power flow control, distributed power generation and load transfer and balance according to the energy consumption requirements of different types of microgrids. And when the single or multiple micro-grids quit operation, the normal operation of other micro-grids is not influenced.
Optionally, each grid-connected device is further configured to connect or disconnect the corresponding second energy load to or from the corresponding microgrid. The second energy load may be set to be a secondary load to the first energy load, and when the load in the grid is too large, the grid-connected device may disconnect the corresponding microgrid from the corresponding second energy load and stop supplying energy to the microgrid. Thus, the normal operation of the first energy load and the safety of the whole power grid can be guaranteed.
The loads are controlled in a hierarchical manner by the grid-connected device, and the important loads (first energy loads) are arranged inside each microgrid, and the secondary loads (second energy loads) are arranged outside each microgrid. The power supply mode of the secondary load can be switched by means of the grid-connected device, namely, the micro grid can supply power or the external grid can supply power. When the microgrid is off-grid, when the internal power prediction, voltage and frequency of the microgrid meet the stable operation requirements, the grid-connected device can access the secondary second energy load into the microgrid and supply power to the microgrid through an internal loop. If the requirement of stable operation is not met, the secondary load can be cut off to ensure the power supply of the important load.
Optionally, in the embodiment of fig. 2, the active power distribution network may further include a centralized energy storage device.
The centralized energy storage device may include a centralized electricity storage device, a centralized heat storage device, and a centralized cold storage device, and is connected to the plurality of micro grids for supplying energy to the plurality of first energy loads and the plurality of second energy loads.
As described above, each microgrid already has distributed energy storage devices (including distributed energy storage devices, distributed heat storage devices and distributed cold storage devices), and on the basis of the distributed energy storage devices, a centralized energy storage device is additionally arranged. By setting a control strategy, a charging and discharging mode can be selected on the principle of economic optimization in the grid-connected state of the active power distribution network, and the power balance in the network can be realized by operating in a standby capacity mode in the isolated state of the active power distribution network.
In addition, in still another embodiment, a power exchange point protection device may be further included in the active power distribution network. The power exchange point protection device has the functions of common current and voltage protection, power selection, frequency and harmonic protection.
The disclosure also provides a control method of the active power distribution network. Fig. 3 is a flowchart of a control method for an active power distribution network according to an exemplary embodiment. As shown in fig. 3, the method includes the following steps.
In step S11, the energy consumption amounts of the plurality of first energy loads are acquired.
In step S12, energy conversion and transmission in each device of the multiple micro-grids are controlled according to energy consumption amounts of the multiple first energy loads, where each micro-grid includes a power generation device, a heating device, a refrigeration device, a distributed power storage device, a distributed heat storage device, and a distributed cold storage device, and the multiple micro-grids are configured to supply energy to the multiple first energy loads connected in a one-to-one correspondence.
Through the technical scheme, the control method of the active power distribution network with the multiple energy complementation is provided, compared with a control mode taking electric power as a main part in the traditional active power distribution network, the regulation capacity and the range of the active power distribution network are improved, the demand side response of the cooperation of electricity, cold and heat is utilized, and the orderliness of participation of the demand side in distribution network scheduling is enhanced.
In an embodiment, the step of controlling the conversion and the transmission of energy in the respective apparatuses of the plurality of piconets based on the energy consumption amounts of the plurality of first energy loads (step S12) may include the following steps, based on fig. 3.
When the output of the power generation device is larger than the power consumption of the corresponding first energy load, controlling the corresponding distributed power storage device to store the residual power;
when the output of the power generation device is greater than the power consumption of the corresponding first energy load and the electric quantity stored by the corresponding distributed power storage device reaches a preset quantity, controlling the heating device to convert the generated residual electric quantity into a hot energy source required by the first energy load, or controlling the refrigerating device to convert the generated residual electric quantity into a cold energy source required by the first energy load;
when the output of the power generation device is larger than the power consumption of the corresponding first energy load, the electric quantity stored by the corresponding distributed power storage device reaches a preset quantity, and the hot energy and the cold energy required by the first energy load are supplied by the heating device and the refrigerating device, the distributed heat storage device is controlled to store the hot energy converted from the residual electric quantity, or the distributed cold storage device is controlled to store the cold energy converted from the residual electric quantity.
In the embodiment, when the active power distribution network runs, the generated power of the distributed power supply can be tracked and responded in real time, and the cold, heat and power supplies can coordinate and intelligently control. When the power generation power of the distributed power supply is larger than the power load of the first energy load, firstly, the charge state of the distributed power storage device is detected, and whether the distributed power storage device can be charged or not is judged. Charging is performed when the distributed power storage apparatus has a charging capacity. When the residual electric quantity is close to a preset critical value, the charging is stopped, and the output of the heating pump is increased to convert the redundant electric energy of the distributed power storage device into cold or heat to meet the cold and heat requirements of the load.
Secondly, if the power generation power of the power generation device is still larger than the electrical load, the heat pump output can be continuously increased to store the cold or heat generated by the heat pump (such as an air source heat pump, a water heat pump, a ground source heat pump, and the like) to the cold or heat storage device.
And thirdly, if the generated power is still larger than the power load, determining whether to transmit power back to the power grid or reduce the generated power by taking the economic advantage as a target, wherein the power generation device is required to work at the rated power as far as possible, so that the service life of the power generation device is prolonged, and the power utilization safety is guaranteed.
When the power generation power is smaller than the electricity load, firstly, the distributed electricity storage device can be controlled to be converted from a charging mode to a discharging mode, secondly, the output of a heat pump is reduced, and the insufficient cold and heat load part is supplied by the distributed heat storage device and the distributed cold storage device; and finally, whether the generated power of the power generation device is increased or not is determined by taking the economic advantage as a target.
In a further embodiment, on the basis of fig. 3, the step of controlling the conversion and transmission of energy in the respective apparatuses of the plurality of microgrids based on the energy consumption amounts of the plurality of first energy loads (step S12) may comprise the following steps.
When the external power grid indicates to reduce the electric load, controlling the heating device and the refrigerating device to reduce the operation power;
when the external power grid indicates to reduce the power load and the heating device and the refrigerating device stop running, controlling to increase the output of the distributed heat storage device and the distributed cold storage device;
and when the external power grid indicates that the power load is reduced, the heating device and the refrigerating device stop operating, and the energy sources in the distributed heat storage device and the distributed cold storage device are completely output, controlling the power generation device to increase the operating power.
And the cold-heat-electricity cooperative demand side response of cold source and heat source output is coordinated by considering the factors such as randomness, intermittence and the like of distributed power generation of each micro-grid. The active power distribution network usually contains three typical cold and heat sources, the first is a lithium bromide unit utilizing waste heat of a generator, the second is a heat pump unit, and the third is a cold storage and heat storage device. When the external power grid provides a demand side response to the active power distribution network and requires to reduce the power consumption load, the output of the heat pump and the cold and heat consumption load can be firstly reduced, the output of the cold storage and heat storage device for supplying cold and heat is secondly increased, the output of the generator is secondly increased, and the output of the generator for supplying cold and heat by waste heat is further increased.
When each microgrid is connected to a corresponding second energy load through a corresponding grid-connected device, the step of controlling the conversion and transmission of energy in each device of the plurality of microgrids according to the energy consumption amounts of the plurality of first energy loads (step S12) may further include, on the basis of the above embodiment: and when the external power grid indicates that the power load is reduced, the heating device and the refrigerating device stop operating, the energy in the distributed heat storage device and the distributed cold storage device is completely output, and the operating power of the power generation device reaches the preset power, controlling to cut off the energy supply to the second energy load. That is, in the above embodiment, if the demand-side response request has not been reached yet, the energy supply of the secondary second energy load may be cut off to secure the normal operation of the important load and the safety of the grid.
When the active power distribution grid further comprises a centralized energy storage means, in a further embodiment the step of controlling the conversion and transmission of energy in the individual devices of the plurality of microgrids (step S12) in dependence of the energy consumption by the plurality of first energy loads may further comprise the following steps.
Controlling the distributed power storage device, the distributed heat storage device and the distributed cold storage device to operate at preset power; and controlling the operation state of the centralized energy storage device according to the energy consumption amount of the first energy load.
In a grid-connected state, the centralized energy storage device can be connected with a collection bus (a bus connecting an active power distribution network and an external power network) for example, operates in an energy type mode, performs peak clipping and valley filling on the active power distribution network, and is assisted with adjustment of active and reactive power, voltage, frequency and the like in the active power distribution network; the distributed energy storage devices (distributed energy storage devices, distributed heat storage devices and distributed cold storage devices) operate in a power mode and are mainly responsible for stabilizing the voltage and frequency of each microgrid in the grid connection and off-grid processes. In the off-grid state, the centralized energy storage device may be switched from, for example, a collection bus to a low-voltage interconnection bus (a bus connected to a plurality of micro-grids), and connected to each micro-grid through an interconnection device. In the embodiment, the centralized energy storage and the distributed energy storage are operated in a complementary mode, and the adjusting capacity of the active power distribution network is improved.
To sum up, this active power distribution network can realize: 1) The multiple functions are complementary, and the cold, hot and power supplies can coordinate intelligent control; 2) Demand side response of the cooperation of cold, heat and electricity; 3) The method comprises the steps of centralized and distributed combined layered energy storage, distributed electric-heat decoupling and interchange energy storage; 4) And multiple micro-grids are operated in parallel and cooperatively controlled.
In particular, the active power distribution network of the present disclosure has improvements and enhancements in four areas. Firstly, the economy of the operation of the active power distribution network is improved, the dependence on an external power grid is reduced, the permeability of distributed energy and renewable energy is improved to a greater extent, and the emission of pollutants and carbon dioxide is reduced through multi-energy complementation and multi-energy coordination intelligent control of cold, heat and power supplies; secondly, demand side response of the cooperation of cold, heat and electricity is relied on, the demand side response capability of the active power distribution network is improved, the demand side response range is expanded, and the dispatching capability of a large power grid on the active power distribution network is improved; thirdly, the complementary operation of concentrated energy storage and distributed energy storage is realized by utilizing the layered energy storage, energy scheduling and power balance are realized in different airspace and time domain dimensions, electric-heat decoupling control, electric-heat economic operation control and the like are realized by utilizing the distributed heat storage, and the demand side response capability of the electric heat load is improved; finally, the parallel operation mode that the multiple micro-grids can be combined randomly after the active power distribution network is off-grid is realized through the parallel operation and the cooperative control of the multiple micro-grids, and the reliability and the flexibility of the off-grid operation of the active power distribution network are further improved. The active power distribution network constructed by the scheme provides a reproducible and generalizable development mode for planning, designing, constructing and operating the active power distribution network.
Fig. 4 is a schematic structural diagram of an active power distribution network according to another exemplary embodiment. The multi-energy complementary active power distribution network comprises various micro-networks, grid-connected devices, interconnection devices, protection devices, energy storage devices and corresponding control systems, and the micro-networks can be interconnected and intercommunicated. In the embodiment of fig. 4, three typical micro grids are shown, namely a cooling, heating and power triple power supply micro grid (No. 1 micro grid), an alternating current and direct current hybrid micro grid (No. 2 micro grid), and an optical storage micro grid (No. 3 micro grid).
The active power distribution network AC10kV or 35kV high-voltage side collects various types of micro-grids, a high-voltage collection I section bus is formed in an energy supply area range, the I section bus is connected with an external power grid in a power system through a grid-connected point (power exchange point) QF1, and a single grid-connected point in the area is formed. And the QF1 on-off state determines the selection and switching of the off-grid operation mode and the grid-connected operation mode of the whole system of the active power distribution network.
And a centralized energy storage device ID32 is configured inside the active power distribution network system and is connected with the I-section bus after being boosted through T4. In a QF1 closing state, QF5 is in a closing state, QF26 is in a breaking state, centralized energy storage works in a P/Q mode, and ID32 can participate in economic dispatching such as large power grid standby capacity, peak clipping and valley filling. If QF1 is in an opening state, QF5 is in an opening state, QF26 is in a closing state and is connected with an IX bus (interconnection bus), and ID32 regulates and controls the voltage and frequency of each type of microgrid in the active power distribution network and ensures the normal operation of each type of microgrid load.
No. 1 microgrid is connected with the I section bus through T1, and QF2 is a T1 low-voltage side load switch. The section II bus in the microgrid is connected with the section I bus after being boosted through the PCC1 switch and the QF2 switch, and each interval loop of the section II bus is as follows: the QF7 loop is provided with a distributed combined cooling heating and power system, the gas/fuel generator ID8 supplies power to other loads through the grid-connected cabinet ID1, and waste heat generated by the ID8 enters the lithium bromide unit ID12 to be converted into cold and hot water and is transmitted to the building ID13 through a cold and hot pipe network to meet the cold and hot load requirements. The cold and heat storage device ID11 is connected with a cold and heat pipe network, and can store cold and heat, and the cold and heat pipe network supplies cold and heat to the ID 13. The QF8 loop is provided with a distributed power generation system (such as distributed photovoltaic, wind power generation and the like) ID9, and the ID9 is inverted by the ID2 to provide electric energy for loads. The QF9 loop is provided with an energy storage battery system, and an energy storage battery ID10 is subjected to ID3 rectification and inversion regulation, and a distributed power supply in the QF8 loop is smoothly connected. The QF10 loop is provided with a heat pump (an air source heat pump, a water source heat pump and a ground source heat pump) system, and cold and hot water generated by the heat pump ID4 is used for supplying cold and hot water for the ID13 through a cold and hot pipe network. The QF11 loop is connected with an important load, and the QF7 loop, the QF8 loop and the QF9 loop of the micro-grids are mutually adjusted to ensure normal power supply of the ID 5. The QF6 loop is connected with the IX bus, under the condition of QF1 switching-off, QF5 switching-off, QF26 switching-on and IX bus electrification are carried out, and the selection is controlled by the ID35 control system and the logic judgment and selection of the ID33 of the interconnection device are carried out, so that QF6 is switched-on, and the voltage, the frequency and the like of the bus at the section II are adjusted. The main 1 switch and the standby 1 switch are subjected to logic delay interlocking and are III-section bus incoming line switches. The QF12 and QF13 loops power ID6 and ID7 other loads. And when QF1 and QF2 are switched on, the main circuit 1 is closed, the standby circuit 1 is disconnected, and the bus in the section III is electrified. When the QF1 and the QF2 are in the brake-off state, the main loop 1 is disconnected, and the standby loop 1 is selectively closed according to the current situation of the No. 1 microgrid and the current ID35 control system of the active power distribution network.
No. 2 microgrid is connected with the I section bus through T2, and QF3 is a T2 low-voltage side load switch. The IV section of bus inside the microgrid is connected with the I section of bus after being boosted through the PCC2 switch and the QF3 switch, and the IV section of bus is separated by each loop: the QF14 loop is a direct current system, the ID14 is a rectifying inverter device with a stable control system, the voltage range of the VI section bus is DC500V-750V, and ID23 distributed power generation is connected to the VI section bus after being subjected to direct current voltage stabilization through an ID 19. And the energy storage battery ID24 is connected into the VI end bus after the ID20 direct current voltage stabilization, and is used for the function balance and rapid adjustment of the VI section bus. The ID21 direct current charging pile is connected to the VI section bus, and the ID22 direct current load is connected to the VI section bus. The voltage and frequency are isolated from each other, active and reactive independent control is realized, and the energy transmission efficiency is higher. The QF15 loop is a bidirectional alternating current charging pile (V2G) ID15, and participates in energy dispatching and power grid power regulation of a large power grid by utilizing distributed energy storage of the electric automobile. The QF17 loop is connected with an IX bus, under the condition of QF1 switching-off, QF5 switching-off, QF26 switching-on and IX bus electrification are carried out, and an ID35 control system controls selection and an interconnection device ID33 logic judgment selection to enable QF17 to be switched-on so as to regulate the voltage, frequency and the like of the bus at the IV section. The main 2 switch and the standby 2 switch are interlocked in a logic delay mode and are used as a V-section bus incoming line switch, and QF18 and QF19 loops supply power to other loads of ID17 and ID 18. And when QF1 and QF3 are switched on, the main 2 loop is closed, the standby 2 loop is disconnected, and the V-section bus is electrified. When QF1 and QF3 are in the brake dividing state, the main loop 2 is disconnected, and the standby loop 2 is in the state of selectively closing according to the current situation of the No. 2 microgrid and the current ID35 control system of the active power distribution network.
No. 3 microgrid is connected with I section bus through T3, and QF4 is a T3 low-voltage side load switch. The VII section bus inside the microgrid is connected with the I section bus after being boosted through the PCC3 switch and the QF4 switch, and the VII section bus comprises each interval loop: the QF20 loop is provided with a distributed power generation system ID30, and the ID30 is inverted by an ID25 to supply power to a load. The QF21 loop has an energy storage battery system ID31, and the ID31 is smoothly connected with the QF20 loop ID30 in the VII bus through ID26 rectification and inversion regulation. The QF22 loop is connected with an important load and ensures the normal power supply of the ID 27. The QF23 loop is connected with an IX section bus, under the condition of QF1 switching-off, QF5 switching-off, QF26 switching-on and IX bus electrification are carried out, and the selection is controlled by the ID35 control system and the logic judgment and selection of the ID33 of the interconnection device are carried out, so that QF123 is switched-on, and the voltage, the frequency and the like of the VII section bus are adjusted. And the main 3 switch and the standby 3 switch are subjected to logic delay interlocking and are VIII section bus incoming line switches. The QF24 and QF25 loops power ID28 and ID29 other loads. And when QF1 and QF4 are switched on, the main 3 loop is closed, the standby 3 loop is disconnected, and the VIII section bus is electrified. When the QF1 and the QF4 are in the brake-off state, the main 3 loop is disconnected, and the standby 3 loop is selectively closed according to the current situation of the No. 3 microgrid and the current ID35 control system of the active power distribution network.
No. 4 microgrid is connected with I section bus through PCC4 and T5, and the interior of the microgrid is combined by one or more of a plurality of power supplies, so that not only electric energy but also other forms of energy required by load are produced. The energy storage system (mechanical energy storage, electromagnetic energy storage and chemical energy storage) is used for smoothing power output, clipping peaks and filling valleys, compensating load fluctuation, improving the power generation efficiency of new energy, improving the quality of electric energy, ensuring the stability of the system through low voltage ride through, tracking plan scheduling, improving the power generation prediction precision and ensuring the normal use of loads with different properties and different grades.
In order to fully utilize complementarity of various distributed energy sources and renewable energy sources in a time domain and a space domain and improve the reliability, stability and continuity of power supply of an active power distribution network system, a grid-connected device is utilized to simplify PCC1, PCC2, PCC3 and PCC4 into a QF1 grid-connected point. ID8, ID9, ID23 and ID30 are used for complementary power generation of various distributed energy sources. The cold and heat sources ID4 and ID12 and ID11 cold and heat storage and storage devices supply cold and heat to ID 13. And (4) load classification, which guarantees power supply requirements of different load classes, wherein ID5, ID16 and ID27 are important loads, and ID6, ID7, ID17, ID18, ID28 and ID29 are non-important loads. The internal power supply, the heat source and the load of each micro-grid are different, and energy interaction complementation is realized among the No. 1, the No. 2 and the No. 3 micro-grids through interconnection devices.
Under the isolated network state of the active power distribution network, the No. 1 microgrid can be interconnected with the No. 2 microgrid through QF6 and QF17 through ID35 energy scheduling and ID33 logic judgment, and the No. 1 microgrid can be interconnected with the No. 3 microgrid through QF6 and QF23 through ID35 energy scheduling and ID33 logic judgment. Through ID35 energy scheduling and ID33 logic judgment, the No. 1 microgrid can be simultaneously interconnected with the No. 2 microgrid and the No. 3 microgrid through QF6, QF17 and QF23, and the No. 2 microgrid can also be interconnected with the No. 3 microgrid through QF17 and QF 23. The centralized energy storage is interconnected with the No. 1 microgrid through the QF6 under the condition of QF5 opening, is interconnected with the No. 2 microgrid through the QF17, is interconnected with the No. 3 microgrid through the QF23, is simultaneously interconnected with the No. 1 microgrid and the No. 2 microgrid through the QF6 and the QF17, is interconnected with the No. 2 microgrid and the No. 3 microgrid through the QF17 and the QF23, and is simultaneously interconnected with the No. 1 microgrid, the No. 2 microgrid and the No. 3 microgrid through the QQF, the QF17 and the QF 23.
The active power distribution network is provided with cold and hot energy storage and electric energy storage, the ID11 is a cold and heat storage device, cold and heat sources of the energy storage are ID12 and ID4, and the ID12 and the ID14 can simultaneously or independently supply cold or heat to the ID 11. The distributed power storage IDs 10, 24 and 31 are distributed power sources ID9, ID23 and ID30 in No. 1, no. 2 and No. 3 microgrids which are smoothly connected in and provide power support for No. 1, no. 2 and No. 3 microgrids which are separated from the microgrid instantaneously. The centralized energy storage ID32 is in peak clipping and valley filling economic operation under the QF1 and QF5 closing states and the QF26 opening state, and serves as a backup power supply to provide power support for the active power distribution network under the QF1 and QF5 opening states and the QF26 closing state.
Under the condition of grid connection of the active power distribution network, QF1, QF2, QF3, QF4, QF5, PCC1, PCC2, PCC3, PCC4, main 1, main 2, main 3, QF7, QF8, QF9, QF10, QF11, QF12, QF13, QF14, QF15, QF16, QF18, QF19, QF20, QF21, QF22, QF24 and QF25 are in a switching-on state, and standby 1, standby 2, standby 3, QF6, QF17, QF23 and QF26 are in a switching-off state.
In an isolated power grid state of the active power distribution network, QF1, QF2, QF3, QF4, QF5, PCC1, PCC2, PCC3, PCC4, main 1, main 2, main 3 and in a brake-off state, QF7, QF8, QF9, QF10, QF11, QF14, QF15, QF16, QF20, QF21, QF22 and QF26 are in a closing state, and QF6, QF17, QF23, QF12, QF13, QF18, QF19, QF24, QF25, standby 1, standby 2 and standby 3 can judge selective closing of system energy calculation through ID35 energy scheduling and ID33 logic.
Under the state of converting grid connection into isolated grid connection, QF1, QF2, QF3, QF4, QF5, PCC1, PCC2, PCC3, PCC4, main 1, main 2, main 3, QF12, QF13, QF18, QF19, QF24 and QF25 change from closing to opening, QF26 change from opening to closing, and QF6, QF17, QF23, standby 1, standby 2, standby 3, QF12, QF13, QF18, QF19, QF24 and QF25 can judge that selective closing is needed through ID35 energy scheduling and ID33 logic.
In the state of switching from isolated network to grid connection, the switching-on state of QF6, QF17, QF23, backup 1, backup 2 and backup 3 is changed into switching-off state, and the switching-off state of QF1, QF2, QF3, QF4, QF5, PCC1, PCC2, PCC3, PCC4, main 1, main 2 and main 3 is changed into switching-on state.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (3)
1. An active power distribution network, comprising:
the micro-grids are connected with one another, each micro-grid comprises a power generation device, a heating device, a refrigeration device, a distributed power storage device, a distributed heat storage device and a distributed cold storage device, the distributed heat storage devices and the distributed cold storage devices are used for supplying energy for a plurality of first energy loads which are connected in a one-to-one correspondence mode, and any two micro-grids are connected with one another;
the control system is connected with the micro-grids and is used for controlling the conversion and transmission of energy in each device of the micro-grids;
the centralized energy storage device comprises a centralized electricity storage device, a centralized heat storage device and a centralized cold storage device, is connected with the micro grids, and is used for supplying energy to the first energy loads and the second energy loads;
the control system includes:
the interconnection device is respectively connected with each micro-grid and used for controlling the circulation of energy among the micro-grids, the interconnection device has the functions of metering, protecting, measuring, synchronizing and switching, and the centralized energy storage device is connected with the micro-grids through the interconnection device;
the microgrid comprises a plurality of microgrid connecting devices, a plurality of first energy loads and a plurality of second energy loads, wherein the microgrid connecting devices are connected with the plurality of microgrids in a one-to-one correspondence manner, each microgrid is connected with a corresponding second energy load through a corresponding microgrid connecting device, each microgrid is connected with an external power grid through a corresponding microgrid connecting device, and each microgrid connecting device is used for connecting or disconnecting the corresponding microgrid and the corresponding second energy load into or from the external power grid;
each grid-connected device is also used for connecting or disconnecting the corresponding second energy load to or from the corresponding microgrid, wherein when the external power grid indicates that the power load is reduced, the heating device and the refrigerating device stop operating, the energy in the distributed heat storage device and the distributed heat storage device is completely output, and the operating power of the power generation device reaches the preset power, the control is carried out to cut off the energy supply to the second energy load.
2. A method of controlling an active power distribution network, the method comprising:
acquiring energy consumption amounts of a plurality of first energy loads;
the method comprises the steps that energy conversion and transmission in each device of a plurality of micro-grids are controlled according to the energy consumption of a plurality of first energy loads, wherein any two micro-grids are connected with each other, each micro-grid comprises a power generation device, a heating device, a refrigerating device, a distributed power storage device, a distributed heat storage device and a distributed cold storage device, and the micro-grids are used for supplying energy to the plurality of first energy loads which are connected in a one-to-one correspondence manner;
the active power distribution network further comprises a centralized energy storage device, the centralized energy storage device comprises a centralized electricity storage device, a centralized heat storage device and a centralized cold storage device, and the centralized energy storage device is connected with the micro-grids and supplies energy to the first energy loads and the second energy loads; the centralized energy storage device is connected with the micro-grids through an interconnection device, the interconnection device has the functions of metering, protecting, measuring, synchronizing and switching, and the interconnection device controls the circulation of energy among the micro-grids;
the step of controlling the conversion and transmission of energy in each of the devices of the plurality of microgrids based on the energy consumption amounts of the plurality of first energy loads may include:
controlling the distributed power storage device, the distributed heat storage device and the distributed cold storage device to operate at a preset power;
controlling the operation state of the centralized energy storage device according to the energy consumption amount of the first energy load;
when the external power grid indicates that the electric load is reduced, controlling the heating device and the refrigerating device to reduce the running power;
when the external power grid indicates to reduce the power load and the heating device and the refrigerating device stop running, controlling to increase the output of the distributed heat storage device and the distributed cold storage device;
when the external power grid indicates to reduce the power load, the heating device and the refrigerating device stop operating, and the energy sources in the distributed heat storage device and the distributed heat storage device are completely output, controlling the power generation device to increase the operating power;
each microgrid is connected with a corresponding second energy load through a corresponding grid-connected device, and the step of controlling the conversion and transmission of energy in each device of the plurality of microgrids according to the energy consumption of the plurality of first energy loads further comprises the following steps:
and when the external power grid indicates that the power load is reduced, the heating device and the refrigerating device stop operating, the energy in the distributed heat storage device and the distributed cold storage device is completely output, and the operating power of the power generation device reaches the preset power, controlling to cut off the energy supply of the second energy load.
3. The method of claim 2, wherein the step of controlling the conversion and transmission of energy among the devices in the plurality of piconets based on the energy consumption of the first energy loads comprises:
when the output of the power generation device is larger than the power consumption of the corresponding first energy load, controlling the corresponding distributed power storage device to store the residual power;
when the output of the power generation device is greater than the power consumption of the corresponding first energy load and the electric quantity stored in the corresponding distributed power storage device reaches a preset quantity, controlling the heating device to convert the generated residual electric quantity into the heat energy required by the first energy load, or controlling the refrigerating device to convert the generated residual electric quantity into the cold energy required by the first energy load;
when the output of the power generation device is larger than the power consumption of the corresponding first energy load, the electric quantity stored by the corresponding distributed power storage device reaches a preset quantity, and the hot energy and the cold energy required by the first energy load are supplied by the heating device and the refrigerating device, the distributed power storage device is controlled to store the hot energy converted from the residual electric quantity, or the distributed power storage device is controlled to store the cold energy converted from the residual electric quantity.
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| CN110797921B (en) * | 2019-12-05 | 2021-03-26 | 深圳市汇拓新邦科技有限公司 | Microgrid control method |
| CN112186757B (en) * | 2020-09-27 | 2023-07-18 | 中国华电科工集团有限公司 | Control method and control device for regional power distribution network and regional power distribution network |
| CA3206764C (en) | 2021-01-29 | 2024-02-27 | Troy Martin | Sustainable energy physical delivery tracking and verification of actual environmental impact |
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