CN117353309A - Alternating current/direct current power distribution network regional layered energy management control method and device - Google Patents
Alternating current/direct current power distribution network regional layered energy management control method and device Download PDFInfo
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
-
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
Abstract
The invention relates to the technical field of energy management and control, and particularly provides a method and a device for regional layered energy management and control of an alternating current/direct current power distribution network, wherein the method comprises the following steps: specifically, a two-layer optimal control structure is adopted according to function division, wherein the first layer is an in-situ control layer, and the second layer is a cluster control layer. The control method can realize the functions of direct current voltage balance, energy distribution, full utilization of distributed energy sources and improvement of economic benefits of the power grid after direct current interconnection of a plurality of power grid groups.
Description
Technical Field
The invention relates to the technical field of energy management and control, in particular to a method and a device for regional layered energy management and control of an alternating current-direct current power distribution network.
Background
Energy is an important support for economic growth and social development, wherein electric energy is dominant in an energy consumption structure, and large countries of world energy consumption aim at development, management, control and application of electric energy, so that energy conservation and emission reduction and establishment of a new generation of intelligent power grid become important strategic deployment for energy development.
The energy management and control system is at the core position in the new generation intelligent power grid, and is a management and control system for executing alternating current-direct current conversion, measurement, monitoring, control, protection and advanced strategy implementation on the power grid. The system can help manage the reliability and the power consumption of the power grid, reduce the energy cost, improve the energy efficiency and reduce the emission of greenhouse gases. Meanwhile, the rapid development and the increasingly complex operation management of new energy sources are not limited to the energy management in a single area, but the requirement on the energy management and control of the multi-area direct current interconnection is remarkably improved, and meanwhile, the problems of direct current voltage balance, energy distribution, full utilization of distributed energy sources, improvement of the economic benefit of a power grid and the like after the multi-area direct current interconnection are effectively solved.
At present, the existing energy management and control technology has the following defects:
1. most energy layering access devices adopt a complex three-layer energy control structure, and the structure is complicated.
2. Most of the existing energy management control methods depend on an upper controller excessively.
3. The existing energy management control method adopts complex algorithms such as genetic algorithm, fuzzy model and the like, and in practical application, the algorithm is too complex and is difficult to realize depending on the computing power of a controller.
4. The problems of multi-region direct current voltage balance, energy management and distribution, economic operation and the like after direct current interconnection are not well solved.
Disclosure of Invention
In order to overcome the defects, the invention provides a regional layered energy management control method and device for an alternating current/direct current power distribution network.
In a first aspect, a method for controlling regional layered energy management of an ac/dc power distribution network is provided, where the method includes:
step S101, the cluster energy management controller obtains the net power of each power system area, determines the active power reference value of each power system area based on the net power of each power system area, and transmits the active power reference value of each power system area to the on-site energy management controller of each power system area;
Step S102, an in-situ energy management controller of each power system area adjusts an active power reference value input in a PQ control strategy in each power system area to be the active power reference value of each power system area, and sends a starting operation instruction to each power system area;
step S103, after each power system area starts to run, the cluster energy management controller determines a direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area, and sends the direct-current voltage real-time adjustment value of each power system area to the local energy management controller of each power system area;
step S104, the in-situ energy management controller of each power system area adjusts the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area;
step S105, the in-situ energy management controller of each power system area judges whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition, if yes, step S106 is executed, otherwise, the power flowing into the ACDC module from the alternating current side in each power system area is adjusted until the power meets the preset constraint condition, and step S106 is executed;
Step S106, the cluster energy management controller stores the time-sharing power data uploaded by the local energy management controllers of the power system areas, and returns to step S101.
Preferably, the power system area is comprised of an in-situ energy management controller, ACDC module, DCDC module, consumer photovoltaic, dc load, and ac load.
Preferably, the determining the active power reference value of each power system area based on the net power of each power system area includes:
if the net power of the power system area is greater than 0, the net power of the power system area is used as an active power reference value of the power system area, the active power reference value of the power system area is issued to an in-situ energy management controller of the power system area, otherwise, the compensation power of the new energy power generation area to the power system area is obtained, and the sum of the net power of the power system area and the compensation power of the new energy power generation area to the power system area is used as the active power reference value of the power system area.
Further, the new energy power generation area is composed of an in-situ energy management controller and a new energy power generation system.
Further, after receiving the start operation instruction, each power system area includes:
starting an ACDC module in the power system area, and sending a started feedback signal to an in-situ energy management controller of the power system area by the ACDC module in the power system area;
after receiving the started feedback signal, the local energy management controller of the power system area sequentially starts the DCDC module, the user photovoltaic, the alternating current load and the direct current load in the power system area.
Preferably, the preset constraint condition includes: the method comprises the steps of integrally operating power balance constraint, alternating-current area power balance constraint, direct-current area power balance constraint and ACDC module conversion constraint.
Further, the mathematical model of the overall operating power balance constraint is as follows:
the mathematical model of the ac zone power balance constraint is as follows:
the mathematical model of the DC region power balance constraint is as follows:
in the above, P netb (t) is the power of the local energy management controller to purchase electricity from the local regional power grid, P nets (t) is the power of the local energy management controller selling electricity to the grid of the local area, P pv (t) output power of user photovoltaic for local area, P acload (t) AC load power for local area, P dcload (t) DC load power of local region, eta 1 For conversion efficiency of ACDC modules in the local area,power flowing into ACDC module for local ac side, +.>For the power of the local area direct current side into the ACDC module, t is the current time,/-at>The dc power flows into the DCDC module for the local area.
Further, the mathematical model of the variable flow constraint of the ACDC module is as follows:
in the above-mentioned method, the step of,is the power flowing into the ACDC module, P acdcmax Is the maximum transmission power of the ACDC module.
In a second aspect, there is provided an ac/dc power distribution network regional layered energy management control apparatus, the ac/dc power distribution network regional layered energy management control apparatus comprising:
the first control module is used for acquiring the net power of each power system area by the cluster energy management controller, determining the active power reference value of each power system area based on the net power of each power system area, and transmitting the active power reference value of each power system area to the on-site energy management controller of each power system area;
the second control module is used for adjusting the active power reference value input in the PQ control strategy in each power system area to be the active power reference value of each power system area by the on-site energy management controller of each power system area, and sending a starting operation instruction to each power system area;
The third control module is used for determining the direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area after each power system area starts to operate, and transmitting the direct-current voltage real-time adjustment value of each power system area to the on-site energy management controller of each power system area;
the fourth control module is used for adjusting the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area by the on-site energy management controller of each power system area;
the fifth control module is used for judging whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition or not by the on-site energy management controller of each power system area, if so, executing the sixth control module, otherwise, adjusting the power flowing into the ACDC module from the alternating current side in each power system area until the power meets the preset constraint condition, and executing the sixth control module;
and the sixth control module is used for storing the time-sharing power data uploaded by the local energy management controllers of the power system areas by the cluster energy management controllers and returning the time-sharing power data to the first control module.
Preferably, the power system area is comprised of an in-situ energy management controller, ACDC module, DCDC module, consumer photovoltaic, dc load, and ac load.
Preferably, the determining the active power reference value of each power system area based on the net power of each power system area includes:
if the net power of the power system area is greater than 0, the net power of the power system area is used as an active power reference value of the power system area, the active power reference value of the power system area is issued to an in-situ energy management controller of the power system area, otherwise, the compensation power of the new energy power generation area to the power system area is obtained, and the sum of the net power of the power system area and the compensation power of the new energy power generation area to the power system area is used as the active power reference value of the power system area.
Further, the new energy power generation area is composed of an in-situ energy management controller and a new energy power generation system.
Further, after receiving the start operation instruction, each power system area includes:
starting an ACDC module in the power system area, and sending a started feedback signal to an in-situ energy management controller of the power system area by the ACDC module in the power system area;
After receiving the started feedback signal, the local energy management controller of the power system area sequentially starts the DCDC module, the user photovoltaic, the alternating current load and the direct current load in the power system area.
Preferably, the preset constraint condition includes: the method comprises the steps of integrally operating power balance constraint, alternating-current area power balance constraint, direct-current area power balance constraint and ACDC module conversion constraint.
In a third aspect, an ac/dc power distribution network regional layered energy management control system is provided, the ac/dc power distribution network regional layered energy management control system includes: clustered energy management controllers, power system areas and their corresponding in-situ energy management controllers, and new energy generation areas and their corresponding in-situ energy management controllers.
In a fourth aspect, there is provided a computer device comprising: one or more processors;
the processor is used for storing one or more programs;
and when the one or more programs are executed by the one or more processors, the method for controlling the regional layered energy management of the AC/DC power distribution network is realized.
In a fifth aspect, a computer readable storage medium is provided, on which a computer program is stored, where the computer program is executed to implement the method for controlling regional layered energy management of an ac/dc distribution network.
The technical scheme provided by the invention has at least one or more of the following beneficial effects:
the invention provides a regional layered energy management control method for an AC/DC power distribution network, which comprises the following steps: step S101, the cluster energy management controller obtains the net power of each power system area, determines the active power reference value of each power system area based on the net power of each power system area, and transmits the active power reference value of each power system area to the on-site energy management controller of each power system area; step S102, an in-situ energy management controller of each power system area adjusts an active power reference value input in a PQ control strategy in each power system area to be the active power reference value of each power system area, and sends a starting operation instruction to each power system area; step S103, after each power system area starts to run, the cluster energy management controller determines a direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area, and sends the direct-current voltage real-time adjustment value of each power system area to the local energy management controller of each power system area; step S104, the in-situ energy management controller of each power system area adjusts the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area; step S105, the in-situ energy management controller of each power system area judges whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition, if yes, step S106 is executed, otherwise, the power flowing into the ACDC module from the alternating current side in each power system area is adjusted until the power meets the preset constraint condition, and step S106 is executed; step S106, the cluster energy management controller stores the time-sharing power data uploaded by the local energy management controllers of the power system areas, and returns to step S101. Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. The control method provided by the invention adopts a two-layer optimized control structure, has good practicability, is simple and clear in control structure, and simplifies most of the adopted complex three-layer energy control structures. The local control layer is provided with an in-situ energy management controller, so that the energy management and distribution of the converter, the AC/DC load and the user photovoltaic can be carried out locally, the power balance multi-constraint condition is met, and the total interactive power injected into or discharged from the local area is uploaded to the second layer cluster control layer.
2. According to the two-layer optimal control structure, each layer is provided with the corresponding energy management controller, and the whole power grid cluster cannot normally work once the upper layer controller fails, unlike the common over-dependent upper layer controller. After the invention is applied, when the cluster control layer fails, the controllers of all local areas can still ensure the reliable and economic operation of all local areas.
3. Furthermore, the invention adopts an effective control method for each control layer in the two-layer optimized control structure. A multi-constraint power balance method is adopted in the local control layer to ensure the local reliable operation of each local area. The control method of the predictive power update is adopted in the cluster control layer to ensure the reliable and economic operation of each local area after the direct current interconnection.
Drawings
Fig. 1 is a schematic flow chart of main steps of a regional layered energy management control method for an ac/dc power distribution network according to an embodiment of the present invention;
FIG. 2 is an application scenario diagram of an AC/DC power distribution network regional layered energy management control system according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a specific application step of a method for controlling regional layered energy management of an ac/dc power distribution network according to an embodiment of the present invention;
fig. 4 is a main structural block diagram of an ac/dc distribution network regional layered energy management control device according to an embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As disclosed in the background art, energy is an important prop for economic growth and social development, wherein electric energy is dominant in an energy consumption structure, and various countries of world energy consumption are dedicated to development, management, control and application of electric energy, so energy conservation and emission reduction, and establishment of a new generation of smart grid have become important strategic deployment for energy development.
The energy management and control system is at the core position in the new generation intelligent power grid, and is a management and control system for executing alternating current-direct current conversion, measurement, monitoring, control, protection and advanced strategy implementation on the power grid. The system can help manage the reliability and the power consumption of the power grid, reduce the energy cost, improve the energy efficiency and reduce the emission of greenhouse gases. Meanwhile, the rapid development and the increasingly complex operation management of new energy sources are not limited to the energy management in a single area, but the requirement on the energy management and control of the multi-area direct current interconnection is remarkably improved, and meanwhile, the problems of direct current voltage balance, energy distribution, full utilization of distributed energy sources, improvement of the economic benefit of a power grid and the like after the multi-area direct current interconnection are effectively solved.
At present, the existing energy management and control technology has the following defects:
1. most energy layering access devices adopt a complex three-layer energy control structure, and the structure is complicated.
2. Most of the existing energy management control methods depend on an upper controller excessively.
3. The existing energy management control method adopts complex algorithms such as genetic algorithm, fuzzy model and the like, and in practical application, the algorithm is too complex and is difficult to realize depending on the computing power of a controller.
4. The problems of multi-region direct current voltage balance, energy management and distribution, economic operation and the like after direct current interconnection are not well solved.
In order to improve the above-mentioned problems,
the above-described scheme is explained in detail below. The invention provides a regional layered energy management control method for an AC/DC power distribution network, which comprises the following steps: step S101, the cluster energy management controller obtains the net power of each power system area, determines the active power reference value of each power system area based on the net power of each power system area, and transmits the active power reference value of each power system area to the on-site energy management controller of each power system area; step S102, an in-situ energy management controller of each power system area adjusts an active power reference value input in a PQ control strategy in each power system area to be the active power reference value of each power system area, and sends a starting operation instruction to each power system area; step S103, after each power system area starts to run, the cluster energy management controller determines a direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area, and sends the direct-current voltage real-time adjustment value of each power system area to the local energy management controller of each power system area; step S104, the in-situ energy management controller of each power system area adjusts the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area; step S105, the in-situ energy management controller of each power system area judges whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition, if yes, step S106 is executed, otherwise, the power flowing into the ACDC module from the alternating current side in each power system area is adjusted until the power meets the preset constraint condition, and step S106 is executed; step S106, the cluster energy management controller stores the time-sharing power data uploaded by the local energy management controllers of the power system areas, and returns to step S101. Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. The control method provided by the invention adopts a two-layer optimized control structure, has good practicability, is simple and clear in control structure, and simplifies most of the adopted complex three-layer energy control structures. The local control layer is provided with an in-situ energy management controller, so that the energy management and distribution of the converter, the AC/DC load and the user photovoltaic can be carried out locally, the power balance multi-constraint condition is met, and the total interactive power injected into or discharged from the local area is uploaded to the second layer cluster control layer.
2. According to the two-layer optimal control structure, each layer is provided with the corresponding energy management controller, and the whole power grid cluster cannot normally work once the upper layer controller fails, unlike the common over-dependent upper layer controller. After the invention is applied, when the cluster control layer fails, the controllers of all local areas can still ensure the reliable and economic operation of all local areas.
3. Furthermore, the invention adopts an effective control method for each control layer in the two-layer optimized control structure. A multi-constraint power balance method is adopted in the local control layer to ensure the local reliable operation of each local area. The control method of the predictive power update is adopted in the cluster control layer to ensure the reliable and economic operation of each local area after the direct current interconnection.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of main steps of a method for controlling regional layered energy management of an ac/dc power distribution network according to an embodiment of the present invention. As shown in fig. 1, the method for controlling regional layered energy management of an ac/dc power distribution network in the embodiment of the present invention mainly includes the following steps:
step S101, the cluster energy management controller obtains the net power of each power system area, determines the active power reference value of each power system area based on the net power of each power system area, and transmits the active power reference value of each power system area to the on-site energy management controller of each power system area;
step S102, an in-situ energy management controller of each power system area adjusts an active power reference value input in a PQ control strategy in each power system area to be the active power reference value of each power system area, and sends a starting operation instruction to each power system area;
step S103, after each power system area starts to run, the cluster energy management controller determines a direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area, and sends the direct-current voltage real-time adjustment value of each power system area to the local energy management controller of each power system area;
Step S104, the in-situ energy management controller of each power system area adjusts the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area;
step S105, the in-situ energy management controller of each power system area judges whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition, if yes, step S106 is executed, otherwise, the power flowing into the ACDC module from the alternating current side in each power system area is adjusted until the power meets the preset constraint condition, and step S106 is executed;
step S106, the cluster energy management controller stores the time-sharing power data uploaded by the local energy management controllers of the power system areas, and returns to step S101.
The power system area is composed of an in-situ energy management controller, an ACDC module, a DCDC module, a user photovoltaic, a direct current load and an alternating current load.
In this embodiment, the determining the active power reference value of each power system area based on the net power of each power system area includes:
if the net power of the power system area is greater than 0, the net power of the power system area is used as an active power reference value of the power system area, the active power reference value of the power system area is issued to an in-situ energy management controller of the power system area, otherwise, the compensation power of the new energy power generation area to the power system area is obtained, and the sum of the net power of the power system area and the compensation power of the new energy power generation area to the power system area is used as the active power reference value of the power system area.
In one embodiment, the new energy generation area is comprised of an in-situ energy management controller and a new energy generation system.
In one embodiment, after receiving the start-up operation instruction, each power system area includes:
starting an ACDC module in the power system area, and sending a started feedback signal to an in-situ energy management controller of the power system area by the ACDC module in the power system area;
after receiving the started feedback signal, the local energy management controller of the power system area sequentially starts the DCDC module, the user photovoltaic, the alternating current load and the direct current load in the power system area.
In this embodiment, the preset constraint condition includes: the method comprises the steps of integrally operating power balance constraint, alternating-current area power balance constraint, direct-current area power balance constraint and ACDC module conversion constraint.
In one embodiment, the mathematical model of the overall operating power balance constraint is as follows:
the mathematical model of the ac zone power balance constraint is as follows:
the mathematical model of the DC region power balance constraint is as follows:
in the above, P netb (t) is the power of the local energy management controller to purchase electricity from the local regional power grid, P nets (t) is the power of the local energy management controller selling electricity to the grid of the local area, P pv (t) output power of user photovoltaic for local area, P acload (t) AC load power for local area, P dcload (t) is the DC load power of the local area, eta 1 is the conversion efficiency of the ACDC module of the local area,power flowing into ACDC module for local ac side, +.>For the power of the local area direct current side into the ACDC module, t is the current time,/-at>The dc power flows into the DCDC module for the local area.
In one embodiment, the mathematical model of the variable flow constraint of the ACDC module is as follows:
in the above-mentioned method, the step of,is the power flowing into the ACDC module, P acdcmax Is the maximum transmission power of the ACDC module.
Based on the above scheme, the invention also provides an alternating current/direct current power distribution network regional layered energy management control system, which comprises: clustered energy management controllers, power system areas and their corresponding in-situ energy management controllers, and new energy generation areas and their corresponding in-situ energy management controllers.
In a specific embodiment, the method of the present invention is actually applied in a system as shown in fig. 2. The system comprises a two-layer control architecture of an on-site control layer and a cluster control layer, wherein the on-site control layer consists of an on-site area 1, an on-site area 2 and an on-site area 3, and the on-site area 1 comprises an on-site energy management controller 1, an ACDC1 module, a DCDCl module, a user photovoltaic 1, a direct current load 1 and an alternating current load 1. The in-situ area 2 includes an in-situ energy management controller 2, an ACDC2 module, a DCDC2 module, a consumer photovoltaic 2, a dc load 2, and an ac load 2. The in-situ region 3 is a photovoltaic region and comprises an in-situ energy management controller 3 and a photovoltaic module. The cluster control layer includes a cluster energy management controller. The specific steps are shown in fig. 3, including:
Step one: the method is divided into 3 local areas according to geographic positions and numbered, and is convenient to control. In order of local area 1, local area 2, local area 3.
Step two: the local area 1 inputs historical data of photovoltaic and load power in the past day into a power curve time-sharing linearization derivative calculation link 1, and outputs to obtain local area 1 time-sharing net power P area1 (t-1) as local area 1 time-sharing predicted power P area1 (t), i.e. P area1 (t)＝P area1 (t-1). If the predicted power P area1 (t) greater than 0 indicates that local area 1 is over-powered for period t, if the predicted power P area1 (t) less than 0 indicates that the local area is not sufficiently powered for the period of time.
The local area 2 inputs historical data of photovoltaic and load power in the past day into a power curve time-sharing linearization derivative calculation link 2, and outputs to obtain local area 2 time-sharing net power P area2 (t-1) as local area 2 time-sharing predicted power P area2 (t), i.e. P area2 (t)＝P area2 (t-1). If the predicted power P area2 (t) is greater than0 indicates that the local area 1 is over-powered for period t, if the predicted power P area2 (t) less than 0 indicates that the local area is not sufficiently powered for the period of time.
Step three: if P area1 (t) greater than 0, the clustered energy management controller will P area1 (t) the in-situ energy management controller 1 sent to the in-situ area 1. If P area1 (t) is less than 0, the photovoltaic unit is controlled by the in-situ energy management controller 3 in the in-situ region 3, and the compensation power P is output PVBC1 (t) calculating P area1 (t)＝P area1 (t)+P PVBC1 (t) then P is determined by the cluster energy management controller area1 (t) the in-situ energy management controller 1 sent to the in-situ area 1.
If P area2 (t) greater than 0, the clustered energy management controller will P area2 (t) the in-situ energy management controller 2 sent to the in-situ region 2. If P area2 (t) is less than 0, the photovoltaic unit is controlled by the in-situ energy management controller 3 in the in-situ region 3, and the compensation power P is output PVBC2 (t) calculating P area2 (t)＝P area2 (t)+P PVBC2 (t) then P is determined by the cluster energy management controller area2 (t) the in-situ energy management controller 2 sent to the in-situ region 2.
Step four: the in-situ energy management controller 1 of the in-situ region 1 receives the P sent by the cluster energy management controller area1 (t) then sending a start command to the ACDC1 module, after which ACDC1 module sends a start feedback signal to the in-situ energy management controller 1, the in-situ energy management controller 1 operates the DCDC1 module, the ac load 1, and the dc load 1 in that order.
The local energy management controller 2 of the local area 2 receives the P sent by the cluster energy management controller area2 (t) then sending a start command to the ACDC2 module, after which ACDC2 module sends a start feedback signal to the on-site energy management controller 2, the on-site energy management controller 2 operates the DCDC2 module, the ac load 2, and the dc load 2 in that order.
Step five: the cluster energy management controller receives the direct current voltage value uploaded by the local energy management controller 1 of the local area 1 in real time1 actual value U dcact1 (t) giving the DC voltage a value U dcgd And U dcact1 (t) inputting into a DC voltage deviation correction link 1, outputting to obtain a DC voltage real-time compensation value U dcbc1 (t) then feeding into a delay link, and outputting to obtain a real-time DC voltage regulating value U dcchange1 (t) the cluster energy management controller will U dcchange1 (t) the in-situ energy management controller 1 sent to the in-situ area 1, is input into the ACDC1 module by the in-situ energy management controller 1.
The cluster energy management controller receives the actual value U of the direct current voltage value 2 uploaded by the local energy management controller 2 of the local area 2 in real time dcact2 (t) giving the DC voltage a value U dcgd And U dcact2 (t) inputting into a DC voltage deviation correction link 2, outputting to obtain a DC voltage real-time compensation value U dcbc2 (t) then feeding into a delay link, and outputting to obtain a real-time DC voltage regulating value U dcchange2 (t) the cluster energy management controller will U dcchange2 (t) the in-situ energy management controller 2 sent to the in-situ region 2, is input by the in-situ energy management controller 2 into the ACDC2 module.
By the calculation method, the cluster energy management controller not only can dynamically adjust the direct current voltage of the local area 1 and the local area 2, but also can realize the direct current voltage balance of the local area l and the local area 2 after direct current interconnection, and ensure the stable and reliable operation of the whole power grid cluster.
Step six: the in-situ energy management controller 1 performs multi-constraint optimization power calculation on ACDC1 modules, DCDC1 modules, user photovoltaic 1, dc load 1, and ac load 1 within the in-situ region 1. The multi-constraint optimization power calculation includes an overall operational balance constraint of field 1, a power balance constraint of field 1 ac area, field 1 dc area, and a variable current constraint of ACDC1 module.
The overall operating power balance constraint for local zone 1 is:
wherein P is netb1 (t) is the power of the in-situ energy management controller 1 purchasing electricity from the grid in the in-situ area 1; p (P) nets1 (t) is the power of the in-situ energy management controller 1 selling electricity to the grid of the in-situ area 1; p (P) pv1 (t) is the output power of the user's photovoltaic in location area 1; p (P) acload1 (t) is the ac load power of local area 1; p (P) dcload1 (t) is the DC load power of local zone 1; η (eta) 1 Conversion efficiency of ACDC1 module for local area 1;the power flowing into the ACDC module at the AC side of the local area 1; />Is the power of the local area 1 dc side into the ACDC module.
The in-situ region 1 ac power balance constraint is:
the in-situ zone 1 dc power balance constraint is:
the current transformation constraint of ACDC1 module is:
wherein:for local area 1 DC side power to the DCDC module, < > >Is the power flowing into the ACDC1 module, theThe value can be positive or negative, the power flowing into the ACDC1 module from the direct current side is positive, the power flowing into the ACDC1 module from the alternating current side is negative, and the power is +.>P acdc1max Is the maximum transmission power of the ACDC1 module.
The in-situ energy management controller 2 performs multi-constraint optimization power calculations for ACDC2 modules, DCDC2 modules, consumer photovoltaic 2, dc load 2, and ac load 2 within the in-situ area 2. The multi-constraint optimization power calculation includes an overall operating balance constraint for local zone 2, a power balance constraint for local zone 2 ac, local zone 2 dc, and a variable current constraint for ACDC2 modules.
The overall operating power balance constraint for local zone 1 is:
wherein P is netb2 (t) is the power of the in-situ energy management controller 2 purchasing electricity from the grid in the in-situ region 2; p (P) nets2 (t) is the power of the in-situ energy management controller 2 selling electricity to the grid of the in-situ area 2; p (P) pv2 (t) is the output power of the user's photovoltaic in location area 2; p (P) acload2 (t) is the ac load power of the local area 2; p (P) dcload2 (t) is the dc load power of the local area 2; η (eta) 2 The conversion efficiency of the ACDC2 module of the local area 2;is the power flowing into ACDC module 2 at the ac side of local area 2; />Is the power flowing into ACDC module 2 on the dc side of local area 2.
The in-situ region 2 ac power balance constraint is:
the in-situ region 2 dc power balance constraint is:
the current transformation constraint of ACDC2 module is:
wherein:for the power flowing into the DCDC module on the direct current side of the local area 2, +.>Is the power flowing into the ACDC2 module, the value can be positive or negative, the power flowing into the ACDC2 module from the direct current side is positive, the power flowing into the ACDC2 module from the alternating current side is negative, and the value is->P acdc2max Is the maximum transmission power of the ACDC2 module.
Step seven: the cluster energy management controller stores the data such as the time-sharing power value uploaded by the local energy management controller 1 of the local area 1, and stores the data such as the time-sharing power value uploaded by the local energy management controller 2 of the local area 2.
Step eight: repeating the second step to the seventh step.
The above embodiments are detailed descriptions of the present invention, and the present invention can be further extended to a scenario of dc interconnection of a larger range and more power grid groups.
Example 2
Based on the same inventive concept, the invention also provides an ac/dc power distribution network regional layered energy management control device, as shown in fig. 4, which comprises:
the first control module is used for acquiring the net power of each power system area by the cluster energy management controller, determining the active power reference value of each power system area based on the net power of each power system area, and transmitting the active power reference value of each power system area to the on-site energy management controller of each power system area;
The second control module is used for adjusting the active power reference value input in the PQ control strategy in each power system area to be the active power reference value of each power system area by the on-site energy management controller of each power system area, and sending a starting operation instruction to each power system area;
the third control module is used for determining the direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area after each power system area starts to operate, and transmitting the direct-current voltage real-time adjustment value of each power system area to the on-site energy management controller of each power system area;
the fourth control module is used for adjusting the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area by the on-site energy management controller of each power system area;
the fifth control module is used for judging whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition or not by the on-site energy management controller of each power system area, if so, executing the sixth control module, otherwise, adjusting the power flowing into the ACDC module from the alternating current side in each power system area until the power meets the preset constraint condition, and executing the sixth control module;
And the sixth control module is used for storing the time-sharing power data uploaded by the local energy management controllers of the power system areas by the cluster energy management controllers and returning the time-sharing power data to the first control module.
Preferably, the power system area is comprised of an in-situ energy management controller, ACDC module, DCDC module, consumer photovoltaic, dc load, and ac load.
Preferably, the determining the active power reference value of each power system area based on the net power of each power system area includes:
if the net power of the power system area is greater than 0, the net power of the power system area is used as an active power reference value of the power system area, the active power reference value of the power system area is issued to an in-situ energy management controller of the power system area, otherwise, the compensation power of the new energy power generation area to the power system area is obtained, and the sum of the net power of the power system area and the compensation power of the new energy power generation area to the power system area is used as the active power reference value of the power system area.
Further, the new energy power generation area is composed of an in-situ energy management controller and a new energy power generation system.
Further, after receiving the start operation instruction, each power system area includes:
starting an ACDC module in the power system area, and sending a started feedback signal to an in-situ energy management controller of the power system area by the ACDC module in the power system area;
after receiving the started feedback signal, the local energy management controller of the power system area sequentially starts the DCDC module, the user photovoltaic, the alternating current load and the direct current load in the power system area.
Preferably, the preset constraint condition includes: the method comprises the steps of integrally operating power balance constraint, alternating-current area power balance constraint, direct-current area power balance constraint and ACDC module conversion constraint.
In one embodiment, the mathematical model of the overall operating power balance constraint is as follows:
the mathematical model of the ac zone power balance constraint is as follows:
the mathematical model of the DC region power balance constraint is as follows:
in the above, P netb (t) is the power of the local energy management controller to purchase electricity from the local regional power grid, P nets (t) is the power of the local energy management controller selling electricity to the grid of the local area, P pv (t) output power of user photovoltaic for local area, P acload (t) AC load power for local area, P dcload (t) DC load power of local region, eta 1 For conversion efficiency of ACDC modules in the local area,power flowing into ACDC module for local ac side, +.>For the power of the local area direct current side into the ACDC module, t is the current time,/-at>The dc power flows into the DCDC module for the local area. />
In one embodiment, the mathematical model of the variable flow constraint of the ACDC module is as follows:
in the above-mentioned method, the step of,is the power flowing into the ACDC module, P acdcmax Is the maximum transmission power of the ACDC module.
Example 3
Based on the same inventive concept, the invention also provides a computer device comprising a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application SpecificIntegrated Circuit, ASIC), off-the-shelf Programmable gate arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, in particular to load and execute one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding functions, to implement the steps of an ac/dc distribution network regional layered energy management control method in the above embodiments.
Example 4
Based on the same inventive concept, the present invention also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a computer device, for storing programs and data. It is understood that the computer readable storage medium herein may include both built-in storage media in a computer device and extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the steps of a method for regional layered energy management control of an ac/dc distribution network in the above embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (17)
1. An ac/dc distribution network regional layered energy management control method, comprising:
step S101, the cluster energy management controller obtains the net power of each power system area, determines the active power reference value of each power system area based on the net power of each power system area, and transmits the active power reference value of each power system area to the on-site energy management controller of each power system area;
step S102, an in-situ energy management controller of each power system area adjusts an active power reference value input in a PQ control strategy in each power system area to be the active power reference value of each power system area, and sends a starting operation instruction to each power system area;
step S103, after each power system area starts to run, the cluster energy management controller determines a direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area, and sends the direct-current voltage real-time adjustment value of each power system area to the local energy management controller of each power system area;
step S104, the in-situ energy management controller of each power system area adjusts the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area;
Step S105, the in-situ energy management controller of each power system area judges whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition, if yes, step S106 is executed, otherwise, the power flowing into the ACDC module from the alternating current side in each power system area is adjusted until the power meets the preset constraint condition, and step S106 is executed;
step S106, the cluster energy management controller stores the time-sharing power data uploaded by the local energy management controllers of the power system areas, and returns to step S101.
2. The method of claim 1, wherein the power system area is comprised of an in-situ energy management controller, ACDC module, DCDC module, consumer photovoltaic, direct current load, and alternating current load.
3. The method of claim 1, wherein the determining the active power reference value for each power system region based on the net power for each power system region comprises:
if the net power of the power system area is greater than 0, the net power of the power system area is used as an active power reference value of the power system area, the active power reference value of the power system area is issued to an in-situ energy management controller of the power system area, otherwise, the compensation power of the new energy power generation area to the power system area is obtained, and the sum of the net power of the power system area and the compensation power of the new energy power generation area to the power system area is used as the active power reference value of the power system area.
4. The method of claim 3, wherein the new energy generation area is comprised of an in-situ energy management controller and a new energy generation system.
5. The method of claim 2, wherein each power system area, upon receiving a start-up operation command, comprises:
starting an ACDC module in the power system area, and sending a started feedback signal to an in-situ energy management controller of the power system area by the ACDC module in the power system area;
after receiving the started feedback signal, the local energy management controller of the power system area sequentially starts the DCDC module, the user photovoltaic, the alternating current load and the direct current load in the power system area.
6. The method of claim 1, wherein the preset constraints comprise: the method comprises the steps of integrally operating power balance constraint, alternating-current area power balance constraint, direct-current area power balance constraint and ACDC module conversion constraint.
7. The method of claim 6, wherein the mathematical model of the overall operating power balance constraint is as follows:
the mathematical model of the ac zone power balance constraint is as follows:
the mathematical model of the DC region power balance constraint is as follows:
In the above, P netb (t) purchasing power to the grid of the local area for the local energy management controllerPower, P nets (t) is the power of the local energy management controller selling electricity to the grid of the local area, P pv (t) output power of user photovoltaic for local area, P acload (t) AC load power for local area, P dcload (t) DC load power of local region, eta 1 For conversion efficiency of ACDC modules in the local area,power flowing into ACDC module for local ac side, +.>For the power of the local area direct current side into the ACDC module, t is the current time,/-at>The dc power flows into the DCDC module for the local area.
8. The method of claim 7, wherein the mathematical model of the ACDC module's variable flow constraints is as follows:
in the above-mentioned method, the step of,is the power flowing into the ACDC module, P acdcmax Is the maximum transmission power of the ACDC module.
9. An ac/dc distribution network regional layered energy management control device, the device comprising:
the first control module is used for acquiring the net power of each power system area by the cluster energy management controller, determining the active power reference value of each power system area based on the net power of each power system area, and transmitting the active power reference value of each power system area to the on-site energy management controller of each power system area;
The second control module is used for adjusting the active power reference value input in the PQ control strategy in each power system area to be the active power reference value of each power system area by the on-site energy management controller of each power system area, and sending a starting operation instruction to each power system area;
the third control module is used for determining the direct-current voltage real-time adjustment value of each power system area according to the voltage deviation of each power system area after each power system area starts to operate, and transmitting the direct-current voltage real-time adjustment value of each power system area to the on-site energy management controller of each power system area;
the fourth control module is used for adjusting the voltage given value input in the direct-current voltage and current double closed-loop control strategy in each power system area to be the direct-current voltage real-time adjustment value of each power system area by the on-site energy management controller of each power system area;
the fifth control module is used for judging whether the power flowing into the ACDC module from the alternating current side in each power system area meets the preset constraint condition or not by the on-site energy management controller of each power system area, if so, executing the sixth control module, otherwise, adjusting the power flowing into the ACDC module from the alternating current side in each power system area until the power meets the preset constraint condition, and executing the sixth control module;
And the sixth control module is used for storing the time-sharing power data uploaded by the local energy management controllers of the power system areas by the cluster energy management controllers and returning the time-sharing power data to the first control module.
10. The apparatus of claim 9, wherein the power system area is comprised of an in-situ energy management controller, ACDC module, DCDC module, consumer photovoltaic, direct current load, and alternating current load.
11. The apparatus of claim 9, wherein the determining the active power reference value for each power system region based on the net power for each power system region comprises:
if the net power of the power system area is greater than 0, the net power of the power system area is used as an active power reference value of the power system area, the active power reference value of the power system area is issued to an in-situ energy management controller of the power system area, otherwise, the compensation power of the new energy power generation area to the power system area is obtained, and the sum of the net power of the power system area and the compensation power of the new energy power generation area to the power system area is used as the active power reference value of the power system area.
12. The apparatus of claim 11, wherein the new energy generation area is comprised of an in-situ energy management controller and a new energy generation system.
13. The apparatus of claim 10, wherein each power system area, upon receiving a start-up operation instruction, comprises:
starting an ACDC module in the power system area, and sending a started feedback signal to an in-situ energy management controller of the power system area by the ACDC module in the power system area;
after receiving the started feedback signal, the local energy management controller of the power system area sequentially starts the DCDC module, the user photovoltaic, the alternating current load and the direct current load in the power system area.
14. The apparatus of claim 9, wherein the preset constraints comprise: the method comprises the steps of integrally operating power balance constraint, alternating-current area power balance constraint, direct-current area power balance constraint and ACDC module conversion constraint.
15. An ac/dc distribution network regional layered energy management control system, the system comprising: the clustered energy management controller, power system zone and its corresponding on-site energy management controller and new energy generation zone and its corresponding on-site energy management controller of any of claims 1-8.
16. A computer device, comprising: one or more processors;
the processor is used for storing one or more programs;
the ac/dc distribution network regional layered energy management control method of any one of claims 1 to 8 is implemented when the one or more programs are executed by the one or more processors.
17. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when executed, implements the ac/dc distribution network regional layered energy management control method according to any one of claims 1 to 8.
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