CN107453364B - A fusion method of energy flow and information flow in regional energy system - Google Patents
A fusion method of energy flow and information flow in regional energy system Download PDFInfo
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Abstract
一种可以实现面向居民侧的区域能源系统的高度集成的区域能源系统的能量流与信息流融合方法，所述区域能源系统集成有多个家庭能源网络、电力供需互动服务平台和通讯管理机，每个家庭能源网络包括家庭智慧能源网关、分布式发电设备、储能设备与用户负荷，该方法包括：家庭智慧能源网关采集用户负荷、发电设备、储能设备的信息，并将信息通过通信管理机上传至电力供需互动服务平台；电力供需互动平台根据信息、预定能量流约束条件和预定优化目标，在预定运营模式下，制定出家庭智慧能源优化协调控制策略，并将该控制策略通过通讯管理机和家庭智慧能源网关下发至发电设备、储能设备与用户负荷，以根据控制策略对发电设备、储能设备与用户负荷相互之间的能量流进行控制。
A method for integrating energy flow and information flow of a district energy system that can realize a highly integrated district energy system facing the residential side, wherein the district energy system integrates a plurality of home energy networks, an interactive service platform for power supply and demand, and a communication management machine, Each home energy network includes a home smart energy gateway, distributed power generation equipment, energy storage equipment and user load. The method includes: the home smart energy gateway collects information on user load, power generation equipment, and energy storage equipment, and manages the information through communication. The machine is uploaded to the power supply and demand interactive service platform; the power supply and demand interactive platform formulates a home smart energy optimization and coordination control strategy under the predetermined operation mode according to the information, predetermined energy flow constraints and predetermined optimization goals, and manages the control strategy through communication. The smart energy gateway of the machine and home sends it to the power generation equipment, energy storage equipment and user load, so as to control the energy flow between the power generation equipment, the energy storage equipment and the user load according to the control strategy.
Description
Technical Field
The invention relates to the field of energy flow and information flow fusion of an electric power system, in particular to an energy flow and information flow fusion method of a regional energy system.
Background
A power grid information-physical system (CPS) interactive modeling method can reflect an interaction mechanism of information flow and energy flow in a power system, and through building a power grid CPS information-physical coupling framework, a primitive model of a CPS sub-module is electrically and logically connected with electrical equipment in the power system to form an integral power grid information-physical fusion system, so that a new framework and technical basis is provided for optimization control, reliability analysis and the like of the power system.
At present, research results mainly relate to an energy flow and information flow fusion method and an interaction mechanism of an electric power system, namely, an information-physical connection relation between a traditional generator set and a load is considered, but the prior art does not relate to an energy flow and information flow fusion method of a regional energy system facing a resident side and comprising novel energy sources and energy storage equipment such as distributed photovoltaic power generation.
Disclosure of Invention
In view of the above, the present invention is directed to a method for merging an energy flow and an information flow of a regional energy system, which can achieve high integration of the regional energy system facing a residential side.
According to the method for fusing the energy flow and the information flow of the regional energy system, the regional energy system comprises a plurality of home energy networks, an electric power supply and demand interaction service platform and a communication manager, each home energy network comprises a home intelligent energy gateway, distributed power generation equipment, energy storage equipment and a user load, and the method comprises the following steps:
the household intelligent energy gateway collects information of the user load, the distributed power generation equipment and the energy storage equipment, and uploads the information to the power supply and demand interaction service platform through the communication management machine;
and the power supply and demand interaction platform works out a household intelligent energy optimization coordination control strategy under a preset operation mode according to the information, a preset energy flow constraint condition and a preset optimization target, and issues the control strategy to the distributed power generation equipment, the energy storage equipment and the user load through the communication management machine and the household intelligent energy gateway so as to control the energy flow among the distributed power generation equipment, the energy storage equipment and the user load according to the control strategy.
Preferably, the predetermined energy flow constraints include flow direction and time period of energy flow between the distributed power generation equipment, the energy storage equipment, and the user load.
Preferably, the predetermined optimization objectives include minimizing operating costs of the home energy network, maximizing energy efficiency of the user load, maximizing utilization of the distributed power generation facility.
Preferably, the predetermined operation mode is a full-rate internet access mode, and in the mode, all electric energy provided by the distributed power generation equipment is transmitted to a power grid; the energy storage device is charged from the grid during off-peak electricity rates and supplies the user load during on-peak electricity rates.
Preferably, the predetermined operation mode is a self-generation self-service and surplus power internet access mode, in which electric energy provided by the distributed power generation equipment is preferentially sent to the user load, surplus electric energy is stored in the energy storage equipment, and if the capacity of the energy storage equipment is limited and all the electric energy cannot be consumed, the surplus electric energy is provided to a power grid to obtain a power price profit; the energy storage device firstly stores the electric energy provided by the distributed power generation device, stores the electric energy of the power grid in the off-peak electricity price period if the surplus capacity exists, and releases the electric energy for the user load to use when the electric energy of the distributed power generation device is insufficient or the electric energy of the power grid is in the peak electricity price period; and under the condition that the distributed power generation equipment and the energy storage equipment are not enough to meet the power utilization requirement of a user, the power grid provides electric energy for the user load.
Preferably, the uploaded information includes the user load, the distributed power generation equipment, and the electric quantity data or the state data of the energy storage equipment.
Preferably, every the family energy network still includes smart jack, smart jack gathers user load electric quantity data or state data, and will electric quantity data or state data upload to family wisdom energy gateway, smart jack still will family wisdom energy gateway the control strategy is issued to user load.
Preferably, each home energy network further includes an active demand response unit, where the active demand response unit actively responds to frequency/voltage changes of a power grid and electricity rate/excitation signals, and on one hand, uploads electricity quantity data or state data of the user load to the home smart energy gateway, and on the other hand, issues the electricity rate/excitation signals to the user load.
Preferably, the communication manager uploads the communication data of the home intelligent energy gateway to the power supply and demand interactive service platform in real time in a preset data frame format after protocol conversion, logic processing and arrangement and aggregation.
Preferably, the distributed power generation facility comprises a distributed photovoltaic power generation facility.
Compared with the prior art, the scheme of the patent has the following advantages at least: the invention not only realizes the high integration of the distributed power generation equipment, the energy storage equipment, the user load and the upper-layer power supply and demand interactive service platform on the resident side in the regional energy system in physics, but also realizes the high integration of energy flow and information flow between the distributed power generation equipment, the energy storage equipment and the user load, improves the interaction capability and self-regulation capability of the regional energy system, and realizes the friendly two-way interaction between a power grid and a family user.
Drawings
Fig. 1a shows an energy flow architecture of a residential side oriented regional energy system in full internet mode according to one embodiment of the invention;
FIG. 1b illustrates an energy flow architecture of a residential side oriented regional energy system in a spontaneous self-service, surplus power grid mode, according to one embodiment of the present invention;
FIG. 2 illustrates an information flow architecture of a residential side oriented regional energy system in accordance with a specific embodiment of the present invention;
fig. 3 illustrates an integrated architecture of a regional energy system according to one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The patent provides an energy flow and information flow fusion method for a regional energy system, which can reflect the coupling relation and interaction mechanism between the energy flow and the information flow of the regional energy system, and provides technical support for constructing a family energy network optimization operation control model comprising user loads, distributed power generation equipment, energy storage equipment and the like and breaking through the optimal energy distribution method of intelligent energy gateways of residential users.
In the following, a specific embodiment of the inventive concept according to the present invention is described with reference to fig. 1 to 3, in which the distributed power generation device of the present invention is, for example, a distributed photovoltaic power generation device, etc., the energy storage device is, for example, a storage battery, etc., and the user load is, for example, an air conditioner, a water heater, etc. Of course, it will be readily apparent to those skilled in the art that the distributed generation equipment, the energy storage equipment, and the user load according to the present invention may be other equivalent equipment of the specific embodiments listed herein, for example, the distributed generation equipment may also be other novel energy sources such as distributed wind power equipment.
In order to better understand the method for fusing the energy flow and the information flow of the regional energy system according to the present invention, three parts will be described, wherein the first part describes the architecture of the energy flow of the regional energy system according to the present invention in different grid-connected modes; the second section describes the architecture of the information flow of the regional energy system according to the invention; the third section describes an architecture for integration of energy flow and information flow for a residential side oriented regional energy system in accordance with the present invention.
(1) According to the invention, the energy flow architecture of the regional energy system under different grid-connected modes
At present, household distributed photovoltaic power generation equipment has two grid-connected modes in common, namely: full internet access mode and spontaneous self-use and residual electricity internet access mode. Although there are differences between the schemes in different modes, the main body and the main body framework participating in the operation of the regional energy system are basically consistent, that is: distributed photovoltaic, distributed energy storage, user load and electric wire netting.
The energy flow architecture of the regional energy system facing the residential side in the two modes is shown in fig. 1, where fig. 1a shows the energy flow architecture of the regional energy system facing the residential side in the full-amount internet surfing mode, and fig. 1b shows the energy flow architecture of the regional energy system facing the residential side in the spontaneous self-service and surplus-electricity internet surfing mode.
In the full-rate internet access mode shown in fig. 1a, the distributed photovoltaic power generation equipment serves as a power supply to provide an energy source, and generated energy is completely transmitted to a power grid; the household energy storage equipment absorbs electric energy from a power grid to charge in the off-peak electricity price period and supplies power to a user load in the on-peak electricity price period, so that the energy is adjusted; the user load is used as an energy terminal, and the energy of the user load is supplied by the user energy storage equipment and the power grid. The structure reduces the influence of the distributed photovoltaic power generation equipment on the operation of a power grid, is convenient for electric quantity metering, and is beneficial to implementing demand side management measures such as time-of-use electricity price and the like.
In the self-generating self-using and residual electricity internet access mode shown in fig. 1b, the generated energy of the distributed photovoltaic power generation equipment is preferentially used by itself, the residual electricity can be stored in the household energy storage equipment, and if the capacity of the energy storage equipment is limited and all electric energy cannot be consumed, the residual electricity can be provided for a power grid to obtain electricity price income. The household energy storage equipment is used as an energy adjusting unit, firstly, electric energy of the distributed photovoltaic power generation equipment is stored, if surplus capacity exists, the electric energy in the low-ebb electricity price period of the power grid is stored, and the energy is released to be used by a user load in the electricity shortage period or the high-ebb electricity price period of the power grid. Under the condition that photovoltaic power generation equipment and energy storage equipment are not enough to meet the household power demand, the user load needs to purchase power from a power grid. The structure truly realizes the local consumption of photovoltaic power generation, thereby reducing the electricity purchasing cost of users and improving the local photovoltaic consumption rate.
(2) Information flow architecture of regional energy system according to the invention
In the different modes, the modes of regional energy system information flow towards the residential side are substantially the same. Fig. 2 illustrates an information flow architecture of a residential side oriented regional energy system according to one embodiment of the present invention. As can be seen from fig. 2, the overall architecture of the information flow may include a system layer, a transport layer, and a device layer.
The system layer comprises a background control program, a database and an interactive interface, wherein the interactive interface reads corresponding data in the database and displays the corresponding data in real time, and the database is responsible for storing state quantity, electric quantity data, control instruction information and calculation results of the control program of each device in the device layer. The control program can realize the optimized operation control in the household energy network, the energy interaction coordination control among a plurality of household energy networks in the regional energy system and the like.
The transmission layer is mainly a communication manager and a household intelligent energy gateway, and the household intelligent energy gateway realizes the functions of energy data acquisition, intelligent management of user load and an optical storage system, energy optimization control and the like, is responsible for uploading information such as electric quantity data, state data and the like of the equipment layer to the system layer, receives control information issued by the system layer and correspondingly controls the equipment layer. The communication management machine can perform corresponding protocol processing, communication data of all intelligent control devices in the regional energy system, such as a household intelligent energy gateway, are uploaded to a system layer in real time in a data frame format after being subjected to protocol conversion, logic processing and arrangement and aggregation, and a database is subjected to data connection with the communication management machine through an information transmission protocol.
The equipment layer comprises an optical storage system, an active demand response unit, an intelligent socket and a user load, the intelligent socket can collect information such as electric quantity data and state data of the user load and upload the information such as the electric quantity data and the state data of the user load to the household intelligent energy gateway, and control information of the household intelligent energy gateway can be issued to the user load through the intelligent socket. The active demand response unit can actively respond to the frequency/voltage change and the electricity price/excitation signal of the power system, and is connected with the user load, so that on one hand, data of the user load can be uploaded to the household energy gateway, and on the other hand, the electricity price/excitation signal is issued to the user load, and the functions of load demand response, automatic control and the like are realized. The light storage system is used for managing the distributed photovoltaic power generation equipment and the energy storage equipment, can transmit information such as electric quantity data and state data of the distributed photovoltaic power generation equipment and the energy storage equipment to the home intelligent energy gateway, and receives control information transmitted from the gateway. All information flows in fig. 2 are bi-directional.
(3) Energy flow and information flow integrated architecture of residential side-oriented regional energy system
Fig. 3 illustrates an integrated architecture of a regional energy system according to one embodiment of the invention. The system takes the energy flow as the most basic physical link and takes the high-speed information flow as the basic communication means, thereby realizing the high integration of the regional energy system facing the resident side.
In fig. 3, from the viewpoint of energy flow, the regional energy system is composed of a plurality of home energy networks No. 0,1 … … n, each home energy network is composed of a home smart energy gateway, a distributed photovoltaic power generation device, an energy storage device and a user load, and is connected to a power grid through a public connection point. The structures of the number 1 to n home energy networks in fig. 3 are the same as those of the number 0 home energy network.
The household intelligent energy gateway is an important hub of a regional energy system, is a bridge for connecting a household energy network and an electric power supply and demand interactive service platform, and realizes standardization of energy and information interfaces, so that effective fusion of energy flow and information flow is guaranteed. Based on the energy flow architecture of the regional energy system, the household intelligent energy gateway can realize coordination control among photovoltaic power generation, energy storage and loads in different grid-connected modes.
From the perspective of information flow, the most basic unit of information acquisition is a home smart energy gateway, which integrates information of a device layer inside a home energy network. The information acquisition of photovoltaic power generation equipment and energy storage equipment is realized through the light storage system, the information of household user load is obtained through the intelligent socket or the active demand response unit, and the information is uploaded to the household intelligent energy gateway.
Then the information of each family energy network is uploaded to a communication manager, and is uploaded to a system layer in real time in a data frame format after being arranged and collected through protocol conversion and logic processing.
The power supply and demand interaction service platform is located on a system layer, information of an equipment layer is collected and analyzed, so that the running cost of the household energy network is minimized, the energy utilization efficiency of the user load is maximized, the utilization rate of the power generation equipment is maximized, the flow direction and the time period of energy flow among the photovoltaic power generation equipment, the energy storage equipment and the user load are taken as constraint conditions, and the functions of multi-user load prediction, demand side active response mechanism compilation, power package/incentive release, supply and demand interaction strategies and the like can be realized. Of course, other optimization objectives and energy flow constraints can be set by those skilled in the art according to actual needs.
In the following, in order to better understand the concept and principle of the energy flow and information flow fusion method of the regional energy system of the present invention, a number 0 home energy network is taken as an example for illustration. In this example, a number 0 home energy network in the regional energy system includes distributed photovoltaic power generation equipment, energy storage equipment, a home smart energy gateway, and household user loads such as an air conditioner and a water heater, the optical storage system realizes information acquisition of the photovoltaic power generation equipment and the energy storage equipment, the smart socket or the active demand response unit acquires information of the user loads and uploads the information to the home smart energy gateway, and the home smart energy gateway uploads the information to the power supply and demand interaction service platform through the communication manager. The power supply and demand interaction platform works out a household intelligent energy optimization coordination control strategy through the results of load prediction and the like, for example, with highest regional energy efficiency as an optimization target, for example, in an operation mode of self-service and surplus power internet access, and sends the control strategy to a household intelligent energy gateway through a communication manager, and the household intelligent energy gateway sends the control strategy to an equipment layer of a household energy network, so that the coordination control of energy among photovoltaic, energy storage and user loads and the transmission of energy flow are realized.
Through analysis of the regional energy system integration architecture, the regional energy system facing the user side can be found to be a comprehensive architecture with high integration of two flow models, because the regional energy system takes energy flow as the most basic physical link and high-speed information flow as the basic communication means. The energy flow is an actual regulation object of a regional energy system, and the information flow is a bridge between the energy flow and a deployment strategy.
According to the integrated architecture of the regional energy system, the household intelligent energy gateway can be effectively connected with a household energy network and an electric power supply and demand interaction platform to realize standardized transmission of energy and information, on one hand, the household intelligent energy gateway can realize acquisition of information such as user load, distributed photovoltaic power generation equipment, energy storage equipment and the like, and upload the information to the electric power supply and demand interaction service platform; on the other hand, the power supply and demand interaction platform combines state perception of multi-source information such as urban user water, electricity and gas, distributed energy and the like, and realizes optimization coordination control on output of a controllable power supply in a home energy network, running time of energy storage equipment and schedulable load, power determination of the controllable load and energy interaction in a superior power grid or a regional energy system through a home smart energy gateway, so that the running cost of the home energy network is minimized, the energy utilization efficiency of residential users is maximized, the utilization rate of renewable energy is improved in an auxiliary mode, and large-scale residential energy efficiency management and demand response service are realized.
According to the integrated architecture of the regional energy system, the energy flow is used as the most basic physical link, the high-speed information flow is used as the basic communication means, the high integration of the regional energy system facing to residents can be realized, and the technical support is provided for realizing the reasonable allocation of the energy flow and the information flow of the regional energy system and the energy mutual assistance of each household energy network.
According to the method for fusing the energy flow and the information flow of the regional energy system, the high integration of the regional energy system facing to the resident side can be realized. Through the effective fusion of the energy flow and the information flow, the reasonable allocation of the energy flow of the distributed light-storage-use equipment in the regional energy system facing the residential side and the effective transmission of the information flow are realized, the local consumption capability of the distributed power supply is improved, the comprehensive energy efficiency management level of a family is improved through the close coupling of the power supply and demand interactive service platform and the family energy network, and the two-way interaction of a power grid and a family user is promoted.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method for fusing energy flow and information flow of a regional energy system is disclosed, wherein the regional energy system comprises a plurality of home energy networks, an electric power supply and demand interaction service platform and a communication manager, and each home energy network comprises a home intelligent energy gateway, distributed power generation equipment, energy storage equipment and a user load; the whole structure of the information flow comprises a system layer, a transmission layer and a device layer; the system layer comprises a background control program, a database and an interactive interface, the interactive interface reads corresponding data in the database and displays the corresponding data in real time, and the database is responsible for storing the state quantity, the electric quantity data, the control instruction information and the calculation result of the control program of each device in the device layer; the control program realizes the optimized operation control inside the household energy network and the energy interaction coordination control among a plurality of household energy networks in the regional energy system; the transmission layer comprises a communication manager and a household intelligent energy gateway, the household intelligent energy gateway realizes the functions of energy data acquisition, intelligent management of user load and an optical storage system and energy optimization control, and is responsible for uploading electric quantity data and state data information of the equipment layer to the system layer, receiving control information sent by the system layer and correspondingly controlling the equipment layer; the communication management machine carries out corresponding protocol processing, communication data of all intelligent control devices in the regional energy system are uploaded to a system layer in real time in a data frame format after being subjected to protocol conversion, logic processing and arrangement and aggregation, and a database is subjected to data connection with the communication management machine through an information transmission protocol; the equipment layer comprises an optical storage system, an active demand response unit, an intelligent socket and a user load, wherein the intelligent socket acquires electric quantity data and state data information of the user load, uploads the electric quantity data and the state data information of the user load to the household intelligent energy gateway, and control information of the household intelligent energy gateway is issued to the user load through the intelligent socket; the active demand response unit actively responds to the frequency/voltage change and the electricity price/excitation signal of the power system, and is connected with the user load, so that on one hand, data of the user load is uploaded to the home energy gateway, and on the other hand, the electricity price/excitation signal is issued to the user load, and the load demand response and automatic control are realized; the light storage system is used for managing the distributed photovoltaic power generation equipment and the energy storage equipment, transmitting electric quantity data and state data information of the distributed photovoltaic power generation equipment and the energy storage equipment to the household intelligent energy gateway, and receiving control information transmitted from the gateway; the method comprises the following steps:
the household intelligent energy gateway collects information of the user load, the distributed power generation equipment and the energy storage equipment, and uploads the information to the power supply and demand interaction service platform through the communication management machine;
the power supply and demand interaction platform works out a household intelligent energy optimization coordination control strategy under a preset operation mode according to the information, a preset energy flow constraint condition and a preset optimization target, and issues the control strategy to the distributed power generation equipment, the energy storage equipment and the user load through the communication management machine and the household intelligent energy gateway so as to control the energy flow among the distributed power generation equipment, the energy storage equipment and the user load according to the control strategy;
the power supply and demand interaction service platform is located on a system layer, information of an equipment layer is collected and analyzed, operation cost of the household energy network is minimized, energy utilization efficiency of user loads is maximized, and utilization rate of the power generation equipment is maximized, flow direction and time period of energy flow among photovoltaic power generation equipment, energy storage equipment and the user loads are taken as constraint conditions, and functions of multi-user load prediction, demand side active response mechanism compilation, power package/incentive release and supply and demand interaction strategy are achieved.
2. The method of energy flow and information flow fusion for a regional energy system of claim 1, wherein the predetermined energy flow constraints include flow direction and time period of energy flow between the distributed power generation equipment, the energy storage equipment, and the user load.
3. The method of energy flow and information flow fusion for a regional energy system of claim 1, wherein the predetermined optimization objectives include minimizing operational costs of the home energy network, maximizing energy efficiency of the customer load, and maximizing utilization of the distributed power generation facilities.
4. The method for fusing energy flow and information flow of the regional energy system according to any one of claims 1 to 3, wherein the predetermined operation mode is a full-rate internet access mode, and in the full-rate internet access mode, all electric energy provided by the distributed power generation equipment is fed into a power grid; the energy storage device is charged from the grid during off-peak electricity rates and supplies the user load during on-peak electricity rates.
5. The method according to any one of claims 1 to 3, wherein the predetermined operation mode is a self-generation and surplus power internet access mode, in which electric energy provided by the distributed power generation equipment is preferentially sent to the user load, surplus electric energy is stored in the energy storage equipment, and if the capacity of the energy storage equipment is limited and all the electric energy cannot be consumed, the surplus electric energy is provided to a power grid to obtain a power price profit; the energy storage device firstly stores the electric energy provided by the distributed power generation device, stores the electric energy of the power grid in the off-peak electricity price period if the surplus capacity exists, and releases the electric energy for the user load to use when the electric energy of the distributed power generation device is insufficient or the electric energy of the power grid is in the peak electricity price period; and under the condition that the distributed power generation equipment and the energy storage equipment are not enough to meet the power utilization requirement of a user, the power grid provides electric energy for the user load.
6. The method according to claim 1, wherein the uploaded information includes the user load, the electric quantity data or the state data of the distributed power generation device or the energy storage device.
7. The method as claimed in claim 6, wherein each home energy network further comprises a smart socket, the smart socket collects the power data or status data of the user load and uploads the power data or status data to the home smart energy gateway, and the smart socket further issues the control policy of the home smart energy gateway to the user load.
8. The method as claimed in claim 1, wherein each home energy network further comprises an active demand response unit, and the active demand response unit actively responds to frequency/voltage variation of a power grid and power rate/excitation signals, on one hand, uploads power data or status data of the user load to the home smart energy gateway, and on the other hand, sends the power rate/excitation signals to the user load.
9. The method as claimed in claim 1, wherein the communication manager uploads the communication data of the home smart energy gateway to the power supply and demand interactive service platform in real time in a predetermined data frame format after protocol conversion, logic processing, and aggregation.
10. The method of energy-flow and information-flow fusion for a regional energy system of claim 1, wherein the distributed power generation facility comprises a distributed photovoltaic power generation facility.
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