CN116231692A

CN116231692A - Urban distributed energy storage system

Info

Publication number: CN116231692A
Application number: CN202310111184.8A
Authority: CN
Inventors: 刘欣宇; 皇甫伟钢; 姚荣华; 王伟通; 单知非; 范春丰; 程林; 黄超; 方磊颖
Original assignee: State Grid Zhejiang Electric Power Co Ltd Tonglu County Power Supply Co; Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Current assignee: State Grid Zhejiang Electric Power Co Ltd Tonglu County Power Supply Co; Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2022-11-24
Filing date: 2023-02-14
Publication date: 2023-06-06

Abstract

The invention provides an urban distributed energy storage system, which comprises a charging unit, an electric storage energy storage unit, a dispatching unit and a settlement unit, wherein the charging unit is connected with the electric storage energy storage unit; the charging unit is used for inputting electric energy to the storage energy storage unit and receiving redundant electric energy of the storage energy storage power supply; the power storage and energy storage unit is provided with a plurality of energy storage units in different levels, a charging and discharging control device, a metering device and a judging module, wherein the charging and discharging control device is used for controlling charging and discharging among the energy storage units in each level under a dispatching instruction of the dispatching unit, the metering device is used for metering the energy of charging and discharging, and the judging module is used for judging the capability of the energy storage units in each level for discharging and receiving the energy and sending the energy to the dispatching unit; the scheduling unit is used for obtaining the electric energy output and input requests of the energy storage units of each level through the judging module and generating scheduling instructions. The invention avoids that the small micro-distributed energy storage units spontaneously supply grid-connected electric energy to the urban power distribution network respectively, reduces disturbance to the urban power distribution network and ensures the electric energy quality of the urban power distribution network.

Description

Urban distributed energy storage system

Technical Field

The invention belongs to the technical field of distributed energy storage, and particularly relates to an urban distributed energy storage system.

Background

The continuous and reliable power supply of the urban power distribution network is related to the life of residents, and is an important foundation for social stability. However, in the world energy shortage and the large background of transforming to clean energy, the urban distribution network may cause insufficient electric energy input into the urban distribution network in a special period due to the integral supply delay of the power generation end of the power network and the inability of timely and continuous supply of large-scale clean energy under certain extreme meteorological conditions (such as high temperature, extreme temperature reduction, typhoon and the like).

The load of the electric energy system in the urban power distribution network always varies, so in order to guide the independent and reasonable arrangement of the electric energy to be used by individual end users (residents and the like) as main bodies of the electric energy side of the urban power distribution network, the plan and the energy saving are promoted, the possible electric energy supply shortage is reduced, the urban power distribution network management manager (power supply company) generally carries out peak-valley electric price system so as to relieve the power shortage of the electric energy peak period, and the electric energy peak period is generally defined from about 8 hours in the morning to 22 hours in the evening, and the electric energy valley period is defined from about 22 hours in the evening to 8 hours in the morning.

However, the actual peak period of electricity consumption of the general individual terminal users (residents) is about 18 to 24 hours in the evening, and under the current peak-valley electricity price mechanism, only partial period of valley electricity consumption can be actually enjoyed, and peak period electricity price still needs to be paid from about 8 to 22 hours in the morning. Because of the uneasiness of electricity storage, once the electricity is generated, the electricity is required to be continuously conveyed for 24 hours, the whole city is continuously supplied with power, the whole utilization rate of the electric energy of the power generation end for power supply of the urban distribution network is improved, the low-cost electric energy in the low-valley electricity utilization period is effectively utilized, the low-cost electric energy is released and used in the electricity utilization peak period, and the common solution is to store the electric energy in the low-valley period by utilizing the electric storage energy storage system.

However, this simple unidirectional storage energy storage in units of individual end users (residents) cannot guarantee that the stored electric energy is used enough or causes excessive energy storage to be not consumed in time, while bidirectional storage energy storage (both energy storage and inverse electric energy transmission to a power distribution network) in units of individual end users (residents) cannot be implemented by the aid of random grid connection at any time due to the fact that the storage capacity of the individual end users (residents) is relatively small, and the distributed energy storage power sources with small capacities are not feasible to join in electric market operation due to the fact that the electric energy consumption and output discontinuity and randomness are only caused by random grid connection at any time. The reason is that the single machine has high access cost due to small capacity, large quantity and uneven distribution, and is difficult to manage when being connected into the urban power distribution network, so that a plurality of technical problems such as current change, line blockage, voltage flicker, harmonic influence and the like are brought to the stable operation of the urban power distribution network. Moreover, the simple bidirectional electric storage and energy storage taking individual end users (residents) as units cannot form a scale effect due to randomness and uncertainty of a counter distribution network, so that the distribution network has insufficient elastic help when facing a large electricity utilization gap.

Therefore, there is a need for an energy storage system that is suitable for and guides individual end users (residents) of an urban distribution network to actively participate, stores energy during low-peak electricity consumption periods, and is used during peak electricity consumption periods, and that can integrate individual end user (resident) energy storage units to form a clustered large-scale linkage energy storage mode, and when the urban distribution network is unbalanced in electric energy, the system can absorb or reversely deliver electric energy to the urban distribution network in a unified clustered manner.

Disclosure of Invention

In order to solve the defects of small capacity, large quantity and uneven distribution of electric power storage and energy storage taking an individual terminal user (resident) as a unit and high difficulty in accessing an urban power distribution network in the prior art, the invention provides an urban distributed energy storage system, which comprises a charging unit, an electric power storage and energy storage unit, a scheduling unit and a settlement unit;

the charging unit is used for inputting electric energy to the electric storage energy storage unit and receiving redundant electric energy of the electric storage energy storage unit;

the power storage and energy storage unit is provided with a plurality of energy storage units in different levels, a charging and discharging control device, a metering device and a judging module, wherein the charging and discharging control device is used for controlling charging and discharging among the energy storage units in each level under a dispatching instruction of the dispatching unit, and the metering device is used for metering the electric energy charged and discharged by the energy storage units and sending the electric energy to the judging module, the dispatching unit and the settlement unit;

The judging module is used for judging the capacity of the energy storage units of each level for releasing electric energy and receiving electric energy and sending the capacity to the scheduling unit; the scheduling unit is used for obtaining the electric energy output and input requests of the energy storage units of each level through the judging module and generating scheduling instructions based on the requests.

Optionally, the plurality of energy storage units of different levels include a primary energy storage unit, a secondary energy storage unit, a tertiary energy storage unit and a quaternary energy storage unit;

the first-level energy storage unit is an energy storage unit built in a residential district by taking households as a unit and is used for storing energy in a valley period and maintaining power supply in a peak period for use, and bidirectional electric energy flow is formed between the first-level energy storage unit and the second-level energy storage unit according to the judgment result of the judgment module;

the secondary energy storage unit is an energy storage unit built in a residential community by taking a unit building as a unit, and is used for maintaining the low-cost electric energy consumption requirement of households in the unit building, and selecting other secondary energy storage units or charging units to form bidirectional electric energy flow according to the judgment result of the judgment module;

the three-level energy storage unit is an energy storage unit established by taking a residential district as a unit and is used for maintaining the low-cost electricity consumption requirement of the residential district and forming bidirectional electric energy flow with other three-level energy storage units or charging units;

The four-stage energy storage unit is an energy storage unit established by taking a city area as a unit and is used for maintaining the low-cost electricity consumption requirement of the city area and forming bidirectional electric energy flow with other four-stage energy storage units or charging units.

Optionally, the primary energy storage unit and the secondary energy storage unit are entity energy storage units, the tertiary energy storage unit is aggregated by all secondary energy storage unit clusters in the residential district, and the quaternary energy storage unit is aggregated by all tertiary energy storage unit clusters in the residential district in the urban area.

Optionally, the three-level energy storage unit and the four-level energy storage unit perform cluster aggregation on the energy storage units in the first and second-level energy storage systems by calling a scheduling unit of a corresponding level.

Optionally, the energy storage unit comprises at least one energy storage device of a storage battery and a hydrogen fuel cell.

Optionally, the judging module is connected to the energy storage unit, the metering device and the scheduling unit, monitors the electric quantity of the energy storage unit in real time, combines the electric energy input by the urban power distribution network and the historical daily electric energy consumption, calculates the predicted electric energy consumption in the future period through logic operation, and judges the capacity of the energy storage units in each level for releasing electric energy and receiving electric energy according to the existing electric energy, the input electric energy and the predicted electric energy consumption in the future period of the energy storage unit.

Optionally, the determining module calculates a difference between the amount of electric energy stored in the energy storage unit and the predicted usage amount of electric energy when determining the capacity of the energy storage unit at each level to release electric energy and receive electric energy, and determines that the energy storage unit has the capacity of releasing electric energy when the difference is a positive value.

Optionally, when the difference is a negative value, it is determined that the energy storage unit needs to receive power supplied by other energy storage units.

Optionally, the settlement unit is respectively connected to the urban area energy storage unit and the residential district energy storage unit, and is used for receiving the metering data sent by the metering device and performing expense settlement on the output and input of electric energy.

Optionally, when the settlement unit performs the cost settlement, a preset price settlement system is implemented between peak-valley electricity prices set by the operation management side of the urban power distribution network, so that the electric energy input price of each stage of electric storage and energy storage unit is smaller than the electric energy output price.

The technical scheme provided by the invention has the beneficial effects that:

(1) According to the distributed energy storage system provided by the invention, wide individual terminal users (residents) of the urban power distribution network can be formed into a part of regional distributed energy storage units in a cellular organization mode, a plurality of residential communities are integrated and aggregated by taking a unit building and a residential community as units, a blocky urban electric bin in the range of the urban area is formed, the original scattered resident electricity is comprehensively managed, residents are led to use low-valley electric energy, and then the charge and discharge devices are controlled through an optimization algorithm and communication, so that bidirectional load flow regulation and control capability between a power grid and the users is realized, electricity demand side management can be established relatively comprehensively, resource allocation is optimized, clean energy consumption is promoted, power grid operation pressure is relieved, corresponding price settlement systems are implemented through operation settlement units, all levels of energy storage units are enabled to obtain forward benefits between energy storage and output electric energy, energy storage output will of all levels of energy storage units are further improved, electricity saving and consciousness of energy storage unit managers are further improved, all energy storage units are promoted to participate in power grid operation regulation positively, and peak clipping is realized. The method has the advantages that the situation that the small micro-distributed energy storage units spontaneously, randomly and randomly grid-connect electric energy to the urban power distribution network at any time in an uncertain mode is avoided, disturbance to the urban power distribution network is reduced, the electric energy quality of the urban power distribution network is guaranteed, forward economic benefits are formed through good electricity utilization, energy conservation and emission reduction, and a low-consumption high-output distributed energy storage system is formed;

(2) The distributed energy storage system provided by the invention can store electricity and energy by using low electricity prices in low electricity consumption time periods to obtain electric energy cheaper than that in high electricity consumption peak time periods, and can be output and used in daytime residential power consumption peak time periods, so that the use of daytime peak electricity price electric energy in residential communities is reduced, the overall electricity charge expenditure in residential communities is reduced, and the electric energy utilization rate of urban power distribution network output is improved;

(3) The distributed energy storage system provided by the invention enables the daytime electricity consumption of the electricity utilization side not to be influenced by the overhauling of the urban power distribution network operation management party (power supply company) in the daytime through the energy storage of the night off-peak electric energy and the establishment of the multi-stage energy storage units, can further improve the inductance acceptance of the user, and further improves the power supply reliability for the urban power distribution network operation management party (power supply company).

Drawings

In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an urban distributed energy storage system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the relationship between a city area storage unit and a residential district storage unit;

FIG. 3 is a schematic diagram of the relationship between a cell building and a household electrical storage and energy storage unit in a residential district electrical storage and energy storage unit;

FIG. 4 is a schematic diagram of a household electrical storage energy storage device;

FIG. 5 is a schematic diagram of a cell tower electric power storage and energy storage device;

FIG. 6 is a diagram showing a relationship between the electric energy settlement charges between the household electric energy storage and storage unit and the unit building electric energy storage and storage unit according to an embodiment of the present invention;

FIG. 7 is a diagram showing the internal structure of a unit building and the relationship between the unit building and a household electricity storage and energy storage unit according to an embodiment of the present invention;

FIG. 8 is a diagram showing the internal structure of a household electricity storage and energy storage unit and the relationship between the household electricity storage and energy storage unit and a unit building according to an embodiment of the present invention;

FIG. 9 is a graph showing the relationship between a unit building storage energy storage unit and a user storage energy storage unit in an embodiment of the present invention;

FIG. 10 is a graph showing the relationship between charging during the low-peak period of the energy storage unit of the unit building and outputting electric energy to the households during peak power consumption in an embodiment of the present invention;

FIG. 11 is a graph showing the relationship between charging at the valley period of the household power storage and energy storage unit and outputting the surplus power to the power storage and energy storage unit of the unit building according to the embodiment of the invention;

Fig. 12 is a graph showing a relationship between the output of surplus power to the charging unit by the power storage and energy storage device of the cell tower according to the embodiment of the present invention.

Detailed Description

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 only some embodiments of the present invention, not all embodiments. 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.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

It should be understood that, in various embodiments of the present invention, the sequence number of each process does not mean that the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

It should be understood that in the present invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in the present invention, "plurality" means two or more. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. "comprising A, B and C", "comprising A, B, C" means that all three of A, B, C comprise, "comprising A, B or C" means that one of the three comprises A, B, C, and "comprising A, B and/or C" means that any 1 or any 2 or 3 of the three comprises A, B, C.

It should be understood that in the present invention, "B corresponding to a", "a corresponding to B", or "B corresponding to a" means that B is associated with a, from which B can be determined. Determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information. The matching of A and B is that the similarity of A and B is larger than or equal to a preset threshold value.

As used herein, "if" may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context.

The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.

Examples:

as shown in fig. 1, the present embodiment proposes an urban distributed energy storage system, which includes a charging unit, an electric storage and energy storage unit, a dispatching unit, and a settlement unit;

the charging unit is used for inputting electric energy to the electric storage energy storage unit and receiving redundant electric energy of the electric storage energy storage unit; the charging unit in the embodiment mainly comprises an urban power distribution network, clean energy sources, a fuel cell stack and the like;

The settlement unit is managed by an operator of the energy storage system and establishes corresponding electric energy output and input prices, so that forward benefits of selling output electric energy are realized by ensuring that the input electric energy prices of all levels of energy storage units are smaller than the output electric energy prices between peak and valley electric prices set by the operation management side (power supply company) of the urban distribution network. The settlement unit is divided into a settlement unit in an electric storage and energy storage unit in an urban area and a settlement unit in an electric storage and energy storage unit in a residential district, and the settlement unit respectively performs charge settlement of energy storage and output electric energy on the energy storage unit in the system.

The basic idea of the urban distributed energy storage system provided by the embodiment is that a household electricity storage energy storage unit and a unit building electricity storage energy storage unit are taken as the minimum energy storage unit and an energy storage unit with a physical energy storage device, the electricity storage energy storage unit is respectively arranged by taking a residential district unit building and a resident as the unit, the urban electricity is started to be charged in the low-electricity-consumption period (from the time of 22 days to the time of 08 days) and other low-electricity-cost time periods, or the low-cost clean energy is used for charging the unit building and the resident electricity storage energy storage unit to form low-cost electric energy, and the low-cost electric energy is released through the electricity storage energy storage unit in the peak electricity-consumption period in the daytime (from the time of 08 hours to the time of 22 hours) to be supplied to the resident with insufficient electric energy (excessive electric energy consumption) in the unit building, or the resident in the unit building is charged by the electricity storage and energy storage unit of the unit building with sufficient electric energy (with redundant electric energy), the electricity storage and energy storage unit of the unit building is used as a transaction reservoir for storing cheap electric energy to regulate the requirement of the resident in the unit building for the electric energy (cheap electric energy) in the low-valley period, and the low-valley electric energy (cheap electric energy) among the unit buildings flows under the dispatching of the dispatching unit on the premise that the resident in the unit building is sufficient for meeting the electricity consumption requirement of the resident in the unit building for the low-valley electric energy, or the residential communities among the unit buildings, namely, the residential communities provided with the energy storage system and the urban areas formed by a plurality of residential communities provided with the energy storage system, the energy storage system is arranged in a residential district, and electric energy flows bidirectionally between an urban area and an urban power distribution network. And the operation of the whole urban distribution network is regulated, so that peak clipping and valley filling are realized. Or the preparation of the required fuel is intensively performed for the fuel cell or the like in the charging unit.

Meanwhile, in order to promote the household electricity storage and energy storage units and the unit building electricity storage and energy storage units to store low-cost electric energy actively, and output the electric energy when electricity consumption peaks or other energy storage units need the electric energy, the embodiment provides a settlement system based on a mechanism that the energy storage price is lower than the output electric energy price, so that the energy storage price of each level of energy storage unit is lower than the output electric energy price between peak and valley electric prices set by an operation management side (a power supply company) of the urban power distribution network, forward benefits are brought by outputting resale electric energy, users or management sides of each level of electricity storage and energy storage units are further promoted to actively develop saving electricity and economic electricity, and the storage of low-cost electric energy is actively developed, so that good support is provided for the stability of the urban power distribution network and the economic operation of a power generation end.

The system is a multi-stage energy storage system which is arranged in a distributed mode, wherein the first stage is the smallest component part of a cellular type electric storage and energy storage unit formed by taking households as units, a unit building electric storage and energy storage device is arranged, electric energy stored by the first stage electric storage and energy storage unit is subjected to secondary energy storage and absorption, and when the low-valley electric energy of the first stage electric storage and energy storage unit is insufficient, low-cost electric energy is supplied to the first stage electric storage and energy storage unit. The urban power distribution network system can integrate individual end users (residents) of the urban power distribution network into a part of regional distributed energy storage units in a honeycomb mode, and then integrate and integrate a plurality of residential communities by taking residential communities as units to form an urban power bin in the urban area, overall management is carried out on the power consumption of the residents scattered originally, the residents are led to save the power consumption, good power consumption habit is developed, low-valley electric energy is used, and the two-way load regulation capacity between the power grid and the users is realized through an optimization algorithm and a communication control charging and discharging device. The resident users of the dispersed individuals can also participate in the operation adjustment of the power grid in a concentrated mode, and peak clipping and valley filling are achieved.

The system avoids the situation that small micro-distributed energy storage units such as resident users of scattered individuals spontaneously, randomly and indefinitely grid-connect electric energy to the urban distribution network at any time, reduces disturbance to the urban distribution network and ensures the electric energy quality of the urban distribution network. And forward economic benefit is formed for electric energy output resale through an energy storage settlement unit formed in the peak-valley electricity price framework. In addition, through the establishment of energy storage and multistage energy storage unit to the off-the-shelf electric energy at night for daytime power consumption is as far as possible not influenced by the maintenance of urban power distribution network operation management side in the daytime, can further promote user inductance and accept degree, has also further improved the power supply reliability to urban power distribution network operation management side.

Specifically, the plurality of energy storage units with different levels comprise a first-level energy storage unit, a second-level energy storage unit, a third-level energy storage unit and a fourth-level energy storage unit;

In this embodiment, the energy storage unit includes at least one energy storage device of a storage battery and a hydrogen fuel cell. For example, the storage battery can be composed of a power battery retired from an electric automobile, and the low-valley electric energy can be converted into storage energy of the storage battery or prepared into hydrogen fuel required by a hydrogen fuel battery.

The primary energy storage units and the secondary energy storage units are entity energy storage units, the tertiary energy storage units are aggregated by all secondary energy storage unit clusters in a residential district, and the quaternary energy storage units are aggregated by all tertiary energy storage unit clusters in a city area. And the three-stage energy storage unit and the four-stage energy storage unit are used for carrying out cluster aggregation on the energy storage units in the first and second-stage energy storage systems by calling the scheduling units of corresponding levels. The third and fourth energy storage systems are energy storage units of the entity in the first energy storage system and the second energy storage system, the energy storage units in the first and second energy storage systems are only clustered and aggregated through scheduling units of corresponding grades, and particularly, scale effects can be formed when electric energy is released and output, the distributed energy storage system is a multi-stage energy storage system which is distributed, the power distribution network is supplemented and regulated, the cellular type power storage and energy storage units are formed in a first stage by taking a user as a unit, the unit building power storage and energy storage units are arranged, secondary energy storage and consumption are carried out on electric energy stored by the first stage power storage and energy storage units, and electric energy is supplied to the first stage power storage and energy storage units when the electric energy of the first stage power storage and energy storage units is insufficient.

The primary energy storage unit is a household electricity storage and energy storage unit, is provided with an entity energy storage unit, is built by households in a residential district by taking a household as a unit, is normally used in a peak period by storing energy of the electricity storage and energy storage unit in a valley period, can select to release redundant electric energy to the unit building electricity storage and energy storage unit according to a judging module result and a household wish and obtain benefits higher than the charging of the valley electric energy, and is used for transferring the valley electric energy to other households in the unit building, even other households in the residential district through the energy storage and adjustment of the unit building electricity storage and energy storage unit.

The secondary energy storage unit is a unit building electric energy storage unit, and is also provided with a physical energy storage unit, so that the electric energy demand of residents in the unit building is maintained under normal conditions, when the electric energy demand of the unit building is met, the electric energy demand of residents in other unit buildings can be implemented through communication and algorithms, the electric energy regulation between the unit building and the residents in the residential district is realized, the disaster is lowered, and the power supply reliability is improved.

The three-level energy storage unit is a residential district power storage and energy storage unit, does not have an entity energy storage unit, consists of a plurality of unit building power storage and energy storage units in the district, and normally maintains the power consumption requirement in the district. Through the regulation to urban distribution network, dig and dive down the disaster, promote the power supply reliability.

The four-stage energy storage unit is an urban area energy storage unit, does not need to be provided with an entity energy storage unit, consists of a plurality of residential district energy storage units in the urban area, can regulate an urban area power distribution network through communication and algorithm when necessary, digs and falls disasters, and improves the power supply reliability. When meeting the electricity demand of the urban area, the urban area electricity storage and energy storage units integrated by the plurality of residential district electricity storage and energy storage units can selectively release output electric energy to other four-level energy storage units or transmit electric energy to the urban power distribution network in the charging unit (or prepare fuel cells), namely: the energy can be absorbed or reversely transmitted to other four-level energy storage units or the urban power distribution network in a unified mode on a large scale under unified scheduling and settlement of the urban area scheduling units, and the effect of the virtual power plant is achieved.

In the present embodiment, the broken line in fig. 2 and 3 indicates transmission of electric energy, and the solid line indicates transmission of data.

The relation between the urban area electric storage and energy storage units and the residential area electric storage and energy storage units is shown in fig. 2, the urban area electric storage and energy storage units integrate and aggregate the electric storage and energy storage units of a plurality of adjacent residential areas, the electric storage and energy storage under the whole urban power distribution network is formed by distributing the plurality of urban area electric storage and energy storage units, the urban area electric storage and energy storage units are formed by integrating and aggregating the electric storage and energy storage units of a plurality of adjacent residential areas, and through the urban area scheduling unit, the electric energy balance among the urban area electric storage and energy storage units can be realized, and the whole transportation of redundant reserved electric energy to the urban power distribution network can also be realized.

The relation between the unit building electric power storage and energy storage units and the household electric power storage and energy storage units in the residential district is shown in fig. 3, the residential district electric power storage and energy storage units integrate and aggregate a plurality of unit building electric power storage and energy storage units in the residential district, and electric power balance and bidirectional flow between the unit building electric power storage and energy storage units and the urban distribution network, between the unit building electric power storage and energy storage units and other unit building electric power storage and energy storage units in the residential district can be realized through the residential district scheduling unit.

Fig. 4 shows a schematic diagram of a household electric power storage and energy storage unit, wherein the household electric power storage and energy storage unit is composed of a 3 rd unidirectional metering device, a household electric power storage and energy storage device, a 4 th bidirectional metering device, a household charge and discharge control device and a household judgment module.

Fig. 5 shows a schematic diagram of a unit building electric power storage and energy storage unit, wherein the unit building electric power storage and energy storage unit consists of a 1 st bidirectional metering device, a 2 nd bidirectional metering device, a unit building electric power storage and energy storage device, a unit building charge and discharge control device and a unit building judgment module.

In order to enable the electric energy to be interacted among the electric energy storage and storage units at all levels, the embodiment is provided with a scheduling unit for controlling electric energy transmission, a charging and discharging control device, a judging module, a metering device, an electric energy transmission control device and the like. The household electricity storage and energy storage unit is integrally arranged with the charge and discharge control device, the judging module, the metering device, the judging device and the like. The charge-discharge control device is responsible for the charge of the electric power storage and energy storage unit to receive the urban power distribution network, discharging the stored redundant and cheap electric energy to the electric power storage and energy storage unit of the unit building and receiving the electric energy from the electric power storage and energy storage unit of the unit building. The unit building electricity storage and energy storage unit is integrally arranged with the charge and discharge control device, the judging module, the metering device, the judging device and the like. The charge-discharge control device is responsible for charge-discharge between the unit building electricity storage and energy storage unit and the urban power distribution network, charges households with insufficient electric energy, and receives discharge of households with sufficient electric energy. The residential-area determination module may also determine whether to deliver power to the utility by determining whether the power in each of the unit buildings within the residential area is sufficient to store power. Where the public facilities are within the entire residential area such as: lobby or public activity room, etc.

Specifically, the charge-discharge control device is used as an important node on the input and output electric energy paths in the unit building electric storage energy storage unit and the household electric storage energy storage unit, and controls the input and output of electric energy. The household electricity storage and energy storage unit is provided with 1 electric energy output path and 2 electric energy input paths. The power input path 1 is: the charging unit inputs cheap electric energy to the household electric power storage and energy storage unit through the charging and discharging control device and the 1 st unidirectional metering device at night. The power input path 2 is: and when the self-reserved electric energy is insufficient in the daytime, the low-cost electric energy input by the electric storage and energy storage unit of the unit building is received through the 2 nd bidirectional metering device. The power output path 1 is: and each household electricity storage and energy storage unit is used according to the actual electric energy use condition of each household. And determining whether redundant electric energy exists or not and the electric energy of the unit building electric storage and energy storage unit can be reselled through the judging module, namely outputting the electric energy to the unit building electric storage and energy storage unit through the 2 nd bidirectional metering device. That is, in the household electricity storage and energy storage unit, the charge/discharge control device controls: charging the household electricity storage and energy storage unit by the electric energy supplied by the urban distribution network; the unit building electricity storage and energy storage unit charges the household electricity storage and energy storage unit; and discharging the household electricity storage and energy storage unit to the unit building electricity storage and energy storage unit. Also in the cell building electricity storage and energy storage unit, the charge and discharge control device controls: the electric energy supplied by the urban power distribution network is charged into the unit building electric storage energy storage unit; discharging the urban power distribution network by the unit building power storage and energy storage unit; the unit building electricity storage and energy storage unit charges the household electricity storage and energy storage unit; and discharging the household electricity storage and energy storage unit to the unit building electricity storage and energy storage unit.

In this embodiment, the determining module is connected to the energy storage unit, the metering device and the scheduling unit, monitors the electric quantity of the energy storage unit in real time, calculates the predicted electric energy consumption of the future period by logic operation in combination with the electric energy input by the urban power distribution network and the historical daily electric energy consumption, and determines the capacity of the energy storage units of each level to release electric energy and receive electric energy according to the existing electric energy, the inputtable electric energy and the predicted electric energy consumption of the energy storage unit.

The judging module calculates the difference value between the stored energy and the predicted use amount of the energy in the energy storage unit when judging the energy release and the energy receiving capacity of the energy storage units in each level, and judges the energy storage unit to have the energy release capacity when the difference value is a positive value. When the difference is negative, the energy storage unit is judged to need to receive power supply of other energy storage units.

The judging module is connected with the energy storage unit, the metering device and the scheduling unit in data mode, and can be connected with the electric energy transmission control device to monitor and judge the electric quantity of the energy storage unit in real time, and whether the electric energy storage and storage unit of the unit building has electric energy output capacity and electric quantity or needs to receive the electric energy capacity and the electric quantity is judged. Whether the household electricity storage and energy storage unit receives the charging of the charging unit or the unit building electricity storage and energy storage unit or has the capacity and electric quantity of outputting electric energy to the unit building electricity storage and energy storage is judged.

Specifically, the judgment information is sent to the scheduling unit and the electric energy transmission control device, the electric energy transmission control device sets the execution condition of the judgment result according to a program or manually, the execution information is sent to the scheduling unit, and the scheduling unit sends an instruction to control the charge and discharge control device according to algorithm balance.

The judging module consists of a judging module in a household electricity storage and energy storage unit, a unit building electricity storage and energy storage unit judging module, a residential district electricity storage and energy storage unit judging module and a city area electricity storage and energy storage unit judging module, wherein the judging module in the household electricity storage and energy storage unit and the unit building electricity storage and energy storage unit judging module are arranged in a materialized mode, and the residential district electricity storage and energy storage unit judging module and the city area electricity storage and energy storage unit judging module are arranged in a virtualized mode after collecting data of the household electricity storage and unit building judging module.

The judging module judges whether each stage of the electric storage energy storage unit is currently in a state of electric energy output requirement or electric energy input requirement, and receives input or output electric energy according to a judging result. According to the different seasons and dates, the electric energy used in the day is predicted through logic operation according to the electric energy input by the urban power distribution network and the historical daily electric energy usage. By calculating the difference between the stored energy of the storage energy storage unit and the electric energy expected to be used in the same day, whether redundant electric energy exists or not is obtained, when the difference between the electric energy is positive, the reverse charging urban power distribution network or other energy storage units with electric energy requirements can be selected for electric energy output, and when the difference between the electric energy is negative, whether electric energy needs to be input by other energy storage units or not can be selected.

A judging module in the household electricity storage and energy storage unit monitors and judges the use condition of the electric energy of the household electricity storage and energy storage unit in real time, judges the current electric energy flowing direction and capacity by measuring and predicting the electric energy used by the historical day of the user and the existing electric quantity of the household electricity storage and energy storage unit, namely, the predicted electric energy used by the current day according to the historical day is multiplied by the error value for allowing prediction, and is subtracted from the electric energy stored by the household electricity storage and energy storage unit, when the difference value is negative, the capacity capable of transmitting the redundant electric energy to the unit building electricity storage and energy storage unit is provided, when the difference value is positive, the electric energy needs to be received from other aspects (a charging unit or a unit building electricity storage and energy storage unit) due to the shortage of the electric energy, and the input and output electric energy is estimated, and the information is sent to a dispatching unit and an electric energy transmission control device in real time. The unit building electricity storage and energy storage unit judging module monitors and judges the use condition of the electric energy in the unit building electricity storage and energy storage unit in real time, judges the current electric energy flowing direction and capacity by measuring and predicting the electric energy used by the unit building on the history day and the existing electric quantity of the electricity storage and energy storage unit, namely predicts the gap electric energy used by each resident in the unit building on the current day according to the history day, multiplies the sum of the gap electric energy used by a value for allowing a prediction error and subtracts the value from the stored electric energy of the unit building electricity storage and energy storage unit, when the difference is negative, the capacity of transmitting the redundant electric energy to the household electricity storage and energy storage unit is shown, and when the difference is positive, the capacity of receiving the electric energy from other aspects (the charging unit or other unit building electricity storage and energy storage units in the residential community) is shown. The information is sent to a PC end in the dispatching unit or a mobile phone end of an administrator of the energy storage system in a data form. And then, the scheduling unit comprehensively balances the electric energy condition in the electric power storage and energy storage unit of the unit building and the power supply and consumption requirements of residents managed by the unit, and sends out input and output instructions to control electric power flow between the resident electric power storage and energy storage unit of the residential district and the electric power storage and energy storage unit of the unit building so as to meet the requirements of residents with insufficient electric energy and receive redundant electric energy stored by the residents.

The residential district electric power storage and energy storage unit judging module monitors and judges the electric power usage condition in all the unit building energy storage units in the residential district in real time, judges whether electric power balance can be carried out among all the unit building electric power storage and energy storage units in the residential district or not through measuring and predicting the electric power consumption of all the unit building energy storage units in the residential district, judges whether the whole residential district currently has the capacity of outputting electric power or needs to input electric power or not, namely predicts the gap electric power usage of the residential district according to the historical day, multiplies the gap electric power usage by a value for allowing a prediction error, and subtracts the sum of the electric power of all the unit building electric power storage and energy storage units in the residential district from the electric power storage unit in the residential district, when the difference is negative, the electric power can be balanced among all the unit buildings in the residential district or transmitted to other residential district, and when the difference is positive, the electric power shortage is indicated as the electric power shortage, the electric power needs to be received from other aspects (the charging unit or other residential district). The information can be sent to a PC end in the dispatching unit or a mobile phone end of an administrator of the energy storage system in a data form.

The urban area electricity storage and energy storage unit judging module monitors and judges the electricity usage situation in all residential area energy storage units in the area in real time, judges whether the electricity balance can be carried out among all residential areas in the area of the city or not by measuring and predicting the electricity consumption of all residential area energy storage units in the area of the city and the existing electricity of all residential area energy storage units in the area of the city, judges whether the area currently has the output electricity or needs the input electricity or not, namely predicts the gap electricity consumption in the area of the city according to the history, multiplies the electricity by a value for allowing prediction errors, subtracts the sum of the electricity storage amounts of all residential area energy storage units under the jurisdiction in the area of the city, and when the difference is negative, the electricity balance can be carried out among all residential areas in the area of the city or the electricity can be transmitted to a charging unit, and when the difference is positive, the electricity shortage is indicated, the electricity receiving from other aspects (the charging unit or other urban area energy storage units) is indicated. The information can be sent to the regional dispatching unit and the urban power distribution network operation manager (PC end or the mobile phone end of the energy storage manager) in a data form. And negotiating by the urban area electricity storage and energy storage unit manager and the urban power distribution network operation manager to carry out electric energy transfer treatment.

The dispatching unit controls the conveying information such as the conveying source, the conveying destination, the conveying amount and the like of the electric energy, and the stored conveying information can be output to the dispatching unit for storage and analysis. The scheduling unit manages the above-described power delivery information stored in the control unit. The scheduling unit may implement management of its scheduling data and execution of scheduling instructions by a PC or the like. The dispatching unit receives input and output electric energy requests and corresponding request electric energy sent by the electric energy transmission control devices of the energy storage units at all levels, comprehensively balances according to the data of the judging module, sends out instructions to implement electric energy flow, and sends the actually generated bidirectional flow electric energy data to the settlement unit for electric energy output and input expense settlement.

In this embodiment, the distributed energy storage system further includes a settlement unit, which is connected to the urban area energy storage unit and the residential district energy storage unit, respectively, and is configured to receive the metering data sent by the metering device, and perform cost settlement. When the settlement unit performs expense settlement, the preset price settlement system is implemented, so that the input energy storage price of each stage of energy storage and storage unit is smaller than the release output price, and the forward benefit brought by the resale of the output electric energy is realized, namely: under the peak-valley electricity price system appointed by an operation management side (a power supply company) of the urban distribution network, each level of energy storage units can bring economic benefits through resale output of electric energy, so that the energy storage output will of each level of energy storage units is improved, and the electricity saving and environmental protection awareness of each level of electric energy users is further improved. Through benefit settlement, the terminal user at the power generation side can further develop good electricity utilization and energy conservation and emission reduction habits.

In this embodiment, a personal computer such as a PC or the like is present in the settlement unit and can be connected to the dispatch unit. By outputting the power transmission information stored in the dispatch unit to the settlement unit computer, it is possible to charge the power consumer for payment to the power provider according to the power transmitted and the destination. The settlement unit makes corresponding electric energy output and input prices by the operation management side of the energy storage system, ensures that the input prices of all levels of energy storage units are smaller than the output electric energy prices between peak-valley electricity prices set by the operation management side of the urban power distribution network, and achieves the aim of forward income brought by the output electric energy. The settlement units are classified into settlement units in the urban area electricity storage and energy storage units and settlement units in the residential area electricity storage and energy storage units. The settlement unit in the urban area electric storage and energy storage unit performs fee settlement according to the electric energy (such as the transmission source of electric energy, the transmission destination of electric energy, the transmission quantity of electric energy and the like) output and input between the electric storage and energy storage units of all residential areas stored in the scheduling unit, and charges or pays fees to the management parties of all levels of energy storage units. The settlement unit in the residential district electricity storage and energy storage unit performs fee settlement according to the electric energy exchange information (such as the transmission source of electric energy, the transmission destination of electric energy, the transmission quantity of electric energy and the like) between the unit building electricity storage and energy storage unit and the household electricity storage and energy storage unit stored in the dispatching unit, and charges or pays fees to the management parties of all levels of energy storage units. And meanwhile, when the electric energy output and input price is formulated in the settlement system, the electric energy consumed by public facilities in the residential district is counted as loss. The fee payment collection can be carried out by cash, card, bank deduction and other methods.

The settlement unit pricing the electric energy costs in the following manner as shown in fig. 6, taking settlement between the primary energy storage unit and the secondary energy storage unit as an example: let the city power access peak electricity price be # -1, the valley electricity price be # -2, the electricity price discharged by the household electricity storage and energy storage unit to the unit building electricity storage and energy storage unit be # -3, the electricity price discharged by the unit building electricity storage and energy storage unit to the household electricity storage and energy storage unit be # -4, the electricity price reversely sent by the unit building electricity storage and energy storage unit to the city power grid be # -5, then the relations among # -1, # -2, # -3, # -4, and # 5 are: the method includes the steps of 1, 4, 3 and 2; the method includes the steps of 1, 5, 3 and 2. Wherein, the price of 4 can be a floating reference price, and the floating is carried out in real time according to the demand of the resident for the input of the cheap electric energy, namely, the more the resident applies for using the cheap electric energy, the higher the price of 4, but the price cannot exceed 1. And 4, in the electricity consumption peak period, the method of independently quoting and bidding by the demand party is adopted to form the device 4, so that the application of using low-cost electric energy and the sequencing of the electric energy by the resident are realized.

The price mechanism is that the electricity price sold by the household electricity storage and energy storage device is lower than the electricity price sold by the unit building electricity storage and energy storage device, but higher than the low-valley electricity price of the commercial power, so that the energy storage unit taking the household as a unit stores low-valley electric energy (low-cost electric energy), and the surplus low-cost electric energy can be reselled to the unit building electricity storage and energy storage unit in a subjective manner through good electricity utilization habit and electricity saving, namely, secondary energy storage is carried out through the unit building electricity storage and energy storage unit, and the household obtains forward electric energy output income through reselling. The manager-resident of the household electricity storage and energy storage unit is promoted, and the self electricity utilization habit is actively maintained and more optimized.

The price of electricity sold by the unit building electricity storage and energy storage device is higher than the price of electricity purchased by the household electricity storage and energy storage device but lower than the peak electricity price of the commercial power, and the formed price mechanism enables the operation manager of the unit building electricity storage and energy storage device to generate profit space in the electricity resale process, so that the operation manager of the unit building electricity storage and energy storage device can actively purchase and resale electric energy, and funds obtained by resale electric energy can be used for maintaining the system and carrying out electric energy supply or property maintenance on public facilities, and the continuous operation of the system can be maintained and a certain profit can be achieved. Namely: between peak and valley electricity prices of the commercial power, the unit building electricity storage energy storage unit is used as an adjustment reservoir device of low-valley electric energy (low-cost electric energy), and redundant low-cost electric energy stored by the household electricity storage energy storage device is subjected to secondary energy storage, so that energy storage participants set the electricity price through a settlement unit, profit space is generated, and the low-cost electric energy such as low-valley electric energy, clean energy and the like is promoted to be actively stored by the participants.

Fig. 7 shows a block diagram of a unit building power storage and energy storage unit, and specifically, the unit building power storage and energy storage device has a charge and discharge control device for controlling power transmission in the unit building power storage and energy storage device. And the charging unit of the unit buildings is connected with the charging and discharging control device and comprises a power generation fuel cell unit, clean energy sources such as wind and light, low-voltage commercial power and the like. The electric storage and energy storage unit is charged in late night by using the commercial power in the valley electricity price period with low electricity charge (the electric energy generated by the power generation fuel cell can be used for charging in daytime), the fuel cell uses fuel (for example, high-purity hydrogen is prepared by clean energy such as wind and light), and the generated electric energy is charged to the energy storage unit, and the wind and light are natural resources, so that low-cost electric energy is generated.

The charge-discharge control device controls electric energy interaction between the electricity storage and energy storage unit of the unit building and the charging unit as well as between the electricity storage and energy storage unit of the user. The electric energy interaction of the electric power storage and energy storage unit of the unit building is as follows: 2 power output paths and 2 power input paths.

The power input path 1 is: the charging unit inputs cheap electric energy to the electric storage and energy storage device through the charging and discharging control device and the 1 st bidirectional metering device at night and other time periods. (or after the clean energy source is used for fuel cell fuel preparation in daytime, the fuel cell inputs electric energy to the electric storage and energy storage device through the 1 st bidirectional metering device);

the power output path 2 is: after the electric storage and energy storage device is charged, the stored low-cost electric energy is output to households with a gap electric energy power consumption requirement in the unit building through the 2 nd bidirectional metering device in the daytime power consumption peak period;

the power output path 3 is: the unit building electricity storage energy storage unit is used according to the actual electric energy use condition. Judging whether redundant electric energy exists or not through a judging module, and reversely outputting electric energy to the urban power distribution network (outputting electric energy to the urban power distribution network or preparing fuel cell fuel by outputting electric energy);

the power input path 4 is: the electric power storage and energy storage device of each resident is used according to the actual electric energy use condition of the resident. The unit building electricity storage and energy storage unit can be reselled through judging whether the redundant electric energy exists or not by the judging module, namely the unit building electricity storage and energy storage device receives the electric energy released by the user electricity storage and energy storage unit through the 2 nd bidirectional metering device.

The unit building power storage and energy storage device is in data communication connection with the charge and discharge control device, the judging module, the residential district scheduling unit and the electric energy transmission control device. The determination module in the unit building electricity storage and energy storage unit is in data connection with the electric energy transmission control device, the determination module is connected to the charge and discharge control device, the electric energy transmission control device is connected to the determination module, and the transmission quantity for transmitting electric energy to other unit buildings in the residential district and acquiring electric energy can be set. As setting of the conveyance amount: for example, the ratio of the supplied electric energy to the remaining electric energy may be set, for example, 20% electric energy may be outputted, and 80% electric energy may be reserved. Or manually setting the power output and input values. Such as outputting a number of wh, or inputting a number of wh.

Fig. 8 shows a block diagram of a household electricity storage and energy storage unit. The household electricity storage and energy storage unit consists of an electricity storage and energy storage device, a charge and discharge control device, a power distribution connection device, a charging unit and the like, and is electrically connected with the electricity storage and energy storage unit of the unit building, and the judgment module in the household electricity storage and energy storage unit, the electric energy transmission control device and the residential district dispatching unit are in data signal connection. The charging unit is used for unidirectionally charging the household electric power storage and energy storage device through the charging and discharging control device, and the household electric power storage and energy storage device is used for outputting electric energy to the unit building electric power storage and energy storage unit through the charging and discharging control device or receiving electric energy input from the unit building electric power storage and energy storage unit. The household judgment module transmits household electric energy judgment information (input state or output state) to the electric energy transmission control device and the residential district dispatching unit, the dispatching unit sends the instruction information generated by the electric energy transmission control device to the household charge and discharge control device after balance calculation, and the charge and discharge control device controls the household electric energy storage and storage unit to receive or output electric energy (from the charging unit or the unit building electric energy storage and storage device).

Fig. 9 is a diagram of the relationship between the unit building storage energy storage unit and the household storage energy storage unit. The broken line in the figure indicates the flow of electric energy, and the solid line indicates the flow of information. A is a household electricity storage and energy storage unit, B is a unit building electricity storage and energy storage unit, and a plurality of household electricity storage and energy storage units A are arranged below one unit building energy storage unit B, namely one unit building electricity storage and energy storage unit corresponds to a household electricity storage and energy storage device comprising all households under the unit building. The energy storage units B of the plurality of unit buildings form a residential district energy storage unit, and a dispatching unit and a settlement unit are arranged in the residential district. The charging and discharging control device in the unit building electricity storage and energy storage unit, the 1 st bidirectional metering device in the unit building electricity storage and energy storage unit, the 2 nd bidirectional metering device, the charging and discharging control device in the household electricity storage and energy storage unit, the 3 rd unidirectional metering device in the household electricity storage and energy storage unit, the 4 th bidirectional metering device and the judging module are electrically connected, the judging module controls the flow of data information, the charging and discharging control device controls the flow of electric energy, and the metering device records the electric energy output and input by the energy storage unit.

The judging module judges whether the energy storage device is in a state of receiving or releasing electric energy currently according to daily use conditions of the energy storage device, calculates electric energy of receiving and releasing electric energy, sends data information to the data storage module in the scheduling unit for storage, and the scheduling unit analyzes and balances the data of the judging modules B and A in the residential district, sends an instruction to the charge and discharge control device and receives or releases electric energy by the charge and discharge control device. And the scheduling unit schedules part of electric energy to supply power to public facilities in the residential district according to the electric energy condition of the energy storage device in the B in the residential district collected by the judging module. And transmits the portion of the electrical energy as loss data to the settlement unit. The dispatching unit is in data connection with the settlement unit, and the settlement unit performs electric energy expense settlement on electric energy input and output parties according to the quota of 1, 2, 3, 4 and 5 according to the monitoring results of the B and A judging modules and the 1 st to 4 th metering devices.

The following describes a specific embodiment of an urban distributed energy storage system:

first, the basic working flow of the electricity storage and energy storage unit of the unit building is described:

as shown in fig. 10, a relationship diagram showing the use of the electric power output to the households when the electric power is charged in the low electricity period of the electric power storage and energy storage unit of the unit building and is used in the peak.

When storing energy:

1. the electric energy control device charges the electric energy storage and storage device through the city power distribution network by the 1 st bidirectional metering device in the low valley period (for example, 22:00-the next day 08:00) of the city power distribution network;

2. besides the urban power distribution network commercial power, the electric energy can also be charged into the electric storage and energy storage device of the unit building in real time through clean energy sources or fuel cells and the like;

3. the judgment module monitors whether the charge quantity of the electric storage energy storage device is full in real time, and when the electric storage energy storage device is full, the dispatching unit sends a charging stopping instruction, and the electric storage energy storage device in the electric storage energy storage unit of the unit building is stopped from being charged through the charging and discharging control device;

4. the electric energy storage capacity in the electric power storage and energy storage unit of the unit building is larger than or equal to the sum of the maximum gap electric energy and the maximum resale electric energy capacity which can occur to all households in the unit building, a certain margin is reserved for the public part of the unit building to use and enough electric energy redundancy is reserved for the household in the unit building to supplement when the electric energy storage is insufficient in peak time of concurrent use;

At this time, the electric energy storage price of the unit building electric energy storage device is valley electric price 2.

When releasing electric energy:

after the energy storage of the unit building is finished, in a peak period (for example, 08:00-22:00 of the next day), the electricity utilization request of the resident in the unit, which is sent by the scheduling unit, to the low-valley electric energy (low-cost electric energy) is sent to the resident through the 2 nd bidirectional metering device, the charge and discharge control device and the 4 th bidirectional metering device, and the electric energy release is carried out on the resident, so that the price of the electric energy output by the unit building energy storage unit is 4.

The energy storage and release electric energy mode uses the unit building electric storage energy storage device as the storage of valley price electric energy and the secondary energy storage equipment of redundant electric energy in the household electric storage energy storage unit, and releases the electric energy to the household needing to be used in the electricity consumption peak period, and the operation manager of the unit building electric storage energy storage unit in the system can obtain forward electricity selling benefits because of 2 </4.

The second energy storage and release path is shown in fig. 11.

When storing energy:

the household electricity storage and energy storage unit is used for charging and storing energy through the charge and discharge control device, the third unidirectional metering device and the energy storage device in the household electricity storage and energy storage unit in a valley period (for example, 22:00-08:00 of Zhejiang province) during a valley electricity price;

Besides the electric energy of the commercial power, the household building electric power storage and energy storage device can be charged in real time through clean energy sources or fuel cells and the like;

the judging module monitors whether the charging quantity of the electric storage energy storage device is full in real time, and when the electric storage energy storage device is full, the dispatching unit sends out a charging stopping instruction, and the charging of the electric storage energy storage device in the household electric storage energy storage unit is stopped through the charging and discharging control device. At this time, the electric energy storage price of the household electric energy storage device is 2;

the electric energy storage capacity in the household electric energy storage unit is kept for a certain margin except the daily electric energy used by the household, so that the household electric energy storage unit can be used for overload.

Releasing electric energy:

when the household electricity storage and energy storage unit is full of electric energy and has allowance, the electric energy transmission control device can send out an instruction, the dispatching unit instructs the charge and discharge control device to charge and store the stored surplus low-valley electric energy (low-cost electric energy) to the unit building electricity storage and energy storage unit through the household electricity storage and energy storage device, the 4 th bidirectional metering device, the charge and discharge control device and the 2 nd bidirectional metering device. At this time, the price of electric energy stored by the electric energy storage unit of the unit building is 3, and at this time, 2 </SUB > 3, the electric energy storage unit of the household in the system controls the person-resident, so that the forward electricity selling benefit can be obtained.

The energy storage and release power path three is shown in fig. 12.

When storing energy:

the unit building electricity storage and energy storage unit stores electric energy at a valley electricity price (2) and an electric energy resale electricity price (3) stored by the household electricity storage and energy storage unit during the valley electricity price.

When releasing electric energy:

1. according to the judgment result of the judgment module, the unit building electricity storage and energy storage unit can transfer the off-peak electricity stored in the off-peak electricity price period (2) and the off-peak electricity stored in the off-peak electricity price period (3) to the electricity stored in the household electricity storage and energy storage unit, and release the electricity to the urban distribution network through the unit building electricity storage and energy storage device-the 1 st bidirectional metering device-the charge and discharge control device according to the dispatching unit instruction;

2. the electric energy release can be independently carried out by a certain unit building electric storage energy storage unit in the residential district, or the residual electric energy of a plurality of unit buildings in the residential district can be collected after calculation by the scheduling unit, and the electric energy release to the commercial power grid is carried out uniformly. At this time, the price of the released electric energy of the unit building electric storage energy storage device is 5.

Because 2 </SUB > 3 </SUB > 5 </SUB >, the operation management side of the electricity storage and energy storage unit of the unit building in the system can also obtain the forward electricity selling benefits.

The various numbers in the above embodiments are for illustration only and do not represent the order of assembly or use of the various components.

The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather, the present invention is to be construed as limited to the appended claims.

Claims

1. The urban distributed energy storage system is characterized by comprising a charging unit, an electric storage energy storage unit, a dispatching unit and a settlement unit;

2. The urban distributed energy storage system according to claim 1, wherein the plurality of different levels of energy storage units comprises a primary energy storage unit, a secondary energy storage unit, a tertiary energy storage unit, and a quaternary energy storage unit;

3. The urban distributed energy storage system according to claim 2, wherein said primary energy storage units and said secondary energy storage units are physical energy storage units, said tertiary energy storage units are aggregated by all secondary energy storage unit clusters in residential cells, and said quaternary energy storage units are aggregated by all residential cell tertiary energy storage unit clusters in urban areas.

4. A distributed energy storage system according to claim 3 wherein the three-level energy storage unit and the four-level energy storage unit cluster aggregate the energy storage units in the first and second energy storage systems by invoking a scheduling unit of the respective level.

5. The urban distributed energy storage system according to claim 1, wherein said energy storage unit comprises at least one of a battery, a hydrogen fuel cell, and a combination thereof.

6. The urban distributed energy storage system according to claim 1, wherein the determining module is connected to the energy storage unit, the metering device and the scheduling unit, monitors the electric quantity of the energy storage unit in real time, calculates the predicted electric quantity used in the future period by logic operation in combination with the electric quantity input by the urban power distribution network and the historical daily electric quantity used, and determines the capacity of the energy storage unit of each level to release electric energy and receive electric energy according to the existing electric quantity of the energy storage unit, the inputtable electric quantity and the predicted electric quantity used in the future period.

7. The urban distributed energy storage system according to claim 6, wherein the determining module calculates a difference between the amount of energy stored in the energy storage unit and the predicted usage amount of the energy storage unit when determining the capacity of each level of energy storage unit to release and receive the energy, and determines that the energy storage unit has the capacity to release the energy when the difference is a positive value.

8. The urban distributed energy storage system according to claim 7, wherein when the difference is negative, it is determined that the energy storage unit needs to receive power from other energy storage units.

9. The urban distributed energy storage system according to claim 1, wherein the settlement unit is connected to the urban area storage and energy storage unit and the residential district storage and energy storage unit respectively, and is configured to receive the metering data sent by the metering device, and perform cost settlement on the output and input of the electric energy.

10. The urban distributed energy storage system according to claim 9, wherein the settlement unit performs a preset price settlement system between peak-to-valley electricity prices set by the urban distribution network operation manager so that the electric energy input price of each stage of the electric storage and energy storage unit is smaller than the electric energy output price when performing the fee settlement.