CN218603186U - A shared energy storage distributed dispatching system for customized power services - Google Patents

Abstract

The utility model proposes a shared energy storage distributed scheduling system oriented to customized power services, including a customized power integrated control module, which includes a data acquisition unit, a compensation device, an energy management system, and a shared energy storage coordination controller , the compensation device includes a voltage sag compensation device, a dynamic harmonic suppression reactive power compensation device, and the data acquisition unit includes a voltage collector and a current collector; a voltage collector, a voltage sag compensation device, an energy management system, and a shared energy storage coordinated control The current collector, dynamic harmonic suppression reactive power compensation device, energy management system, and shared energy storage coordination controller constitute the second dispatching channel; the shared energy storage coordination controller is connected to the distributed energy storage subsystem respectively power control switch. This technical solution provides diversified customized power services to the user side by setting different dispatching channels to meet the diverse needs of users for power quality.

Description

A shared energy storage distributed dispatching system for customized power services

technical field

The utility model belongs to the field of electric power dispatching, in particular to a shared energy storage distributed dispatching system oriented to customized electric power services.

Background technique

With the continuous advancement of technology in the energy and power industry, the energy Internet will become an important development direction for the future development of power grids. Among the technologies related to the Energy Internet, the joint operation of distributed energy storage and distributed renewable energy will be an important development direction of the Energy Internet in the future. Unlike the large-scale centralized energy storage that is invested and installed on the power source side and in the power grid, distributed energy storage is usually installed on the user side to store the excess power generated by the user's renewable energy or to reduce electricity costs by helping the user's load curve shift peaks . However, the current cost of energy storage is still high, and it is difficult to be universally economical, which limits the widespread application of distributed energy storage. In order to solve this problem, shared energy storage based on the sharing economy model came into being. Shared energy storage is a shared energy storage technology based on the existing power grid that has been built. It comprehensively utilizes centralized energy storage facilities or aggregates distributed energy storage resources, so that users can use it anytime, anywhere and on demand. Shared energy storage resources composed of or distributed energy storage facilities, thereby reducing energy storage usage costs for users and shortening the investment recovery period of energy storage.

It usually includes multiple conventional distributed energy storage subsystems (DESS), where each DESS includes a battery management system (BMS), a power conversion system (PCS) and an energy storage unit. In the prior art, the energy management system usually consists of (EMS) controls the BMS, and then realizes the charging and discharging power of the distributed energy storage units through the PCS, so as to provide shared energy storage services to the user side. Existing distributed energy storage systems usually only provide owners with a single active energy-saving service that eliminates day and night load peaks and valleys, and cannot provide more diversified services to users with special power quality management requirements such as voltage offsets and voltage sags. Custom electrical service.

Utility model content

In order to solve the shortcomings and deficiencies of the single service of the energy storage system in the prior art, the utility model adds a customized power integrated control module to the conventional distributed energy storage system on the user side to realize the centralized control of multiple types of services and man-machine Interaction, different scheduling channels are combined by the existing voltage sag compensation device, dynamic harmonic suppression reactive power compensation device, voltage deviation control device and shared energy storage coordination controller, which can be used for voltage sag control, harmonic Suppression and voltage deviation capacity compensation to meet the diverse needs of users for power quality.

The shared energy storage distributed scheduling system proposed by the utility model includes several distributed energy storage subsystems, user-side loads correspondingly connected to the distributed energy storage subsystems, and a customized power integrated control module. The customized power integrated control The module includes a data acquisition unit, a compensation device, an energy management system, and a shared energy storage coordination controller. The compensation device includes a voltage sag compensation device and a dynamic harmonic suppression reactive power compensation device. The data acquisition unit includes a voltage collector and current collector;

The voltage collector, the voltage sag compensation device, the energy management system, and the shared energy storage coordination controller are sequentially connected to form a first scheduling channel; the current collector, the dynamic harmonic suppression reactive power compensation device, the energy management system, and the shared energy storage The energy storage coordinating controllers are sequentially connected to form a second scheduling channel; the shared energy storage coordinating controllers are respectively connected to the charging and discharging power control switches of each distributed energy storage subsystem.

Optionally, the input terminals of the voltage collector and the current collector are both connected to the three-phase terminals of the load on the user side;

The output end of the voltage collector is connected to the input end of the voltage sag compensation device through an A/D conversion unit;

The output end of the current collector is connected to the input end of the reactive power compensation device for dynamic harmonic suppression via an A/D conversion unit.

Optionally, the output terminal of the dynamic harmonic suppression reactive power compensation device is connected to the input terminal of the voltage sag compensation device.

Optionally, the compensation device also includes a voltage deviation management device, the data acquisition unit also includes a meteorological sensor installed on the user side load, and the voltage collector, current collector, and meteorological sensor in the data acquisition unit are sequentially Connect the voltage deviation control device, the energy management system and the shared energy storage coordination controller to form the third dispatching channel.

Optionally, the customized power integrated control module further includes a display terminal, the display terminal is connected to the energy management system and the shared energy storage coordinating controller through an IO port, and is used to visualize the energy management system and the The shared energy storage coordinates the scheduling actions of the controller.

The beneficial effects brought by the technical solution provided by the utility model are:

(1) On the basis of the conventional user-side energy storage system, a customized power integrated control module is added to realize centralized dispatching control of multiple types of services, and various customized power services are provided to the user side by setting different dispatching channels to realize distributed The active and reactive power of the shared energy storage subsystem can be quickly coordinated and dispatched to meet the diverse needs of users for power quality.

(2) During the service process, the data visualization module is used to display the user-side customized power service information and the status information of the shared energy storage subsystem on the computer terminal of the management personnel. The management personnel can control the system through the computer terminal to realize artificial concentration of system operation System monitoring and human intervention in abnormal situations ensure the safe operation of the system.

Description of drawings

In order to illustrate the technical solution of the utility model more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the utility model. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Figure 1 is a schematic structural diagram of a shared energy storage distributed dispatching system oriented to customized power services proposed by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a conventional user-side energy storage system.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present utility model and the above drawings are used to distinguish similar objects and do not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein.

It should be understood that in various embodiments of the present utility model, the size of the sequence numbers of each process does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic, and should not be used to implement the present utility model. The implementation of the examples constitutes no limitation.

It should be understood that in the present utility model, "comprising" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily Restricted to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

It should be understood that in the present utility model, "plurality" refers to two or more than two. "And/or" is just an association relationship describing associated objects, which means that there can be three kinds of relationships, for example, and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. . The character "/" generally indicates that the contextual objects are an "or" relationship. "Includes A, B and C", "Includes A, B, C" means that A, B, and C are all included, "includes A, B, or C" means includes one of A, B, and C, "Containing A, B and/or C" means containing any 1 or any 2 or 3 of A, B and C.

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

Depending on the context, "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting".

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

Example:

As shown in Figure 1, this embodiment proposes a shared energy storage distributed scheduling system oriented to customized power services. The shared energy storage distributed scheduling system includes several distributed energy storage subsystems, and distributed energy storage The subsystem corresponds to the connected user-side load and a customized power integrated control module. The customized power integrated control module includes a data acquisition unit, a compensation device, an energy management system, and a shared energy storage coordination controller. The compensation device includes a voltage sag compensation device and a dynamic harmonic suppression reactive power compensation device, the data acquisition unit includes a voltage collector and a current collector;

The voltage collector, the voltage sag compensation device, and the shared energy storage coordinating controller are sequentially connected to form a first dispatching channel; the current collector, the dynamic harmonic suppression reactive power compensation device, and the shared energy storage coordinating controller are sequentially connected to form a The second scheduling channel: the shared energy storage coordinating controller is respectively connected to the charge and discharge control switches of each shared energy storage node.

Figure 2 provides a schematic structural diagram of a conventional user-side energy storage system, which usually includes multiple conventional distributed energy storage subsystems (DESS), where each DESS includes a battery management system (BMS), a power conversion system (PCS) And energy storage units, in the prior art, the BMS is usually controlled by the energy management system (EMS), and then the charging and discharging power of the distributed energy storage units is realized through the PCS, so as to provide shared energy storage services to the user side.

It can be seen from Figure 1 that this embodiment takes n distributed energy storage subsystems DESS1~DESSn as an example, and each DESS consists of BMS, energy storage unit and PCS, through which n distributed energy storage subsystems Provide shared energy storage services for m users corresponding to load 1 to load m respectively. In this embodiment, on the basis of the conventional user-side energy storage system composed of n distributed energy storage subsystems, a customized system including data acquisition unit, A/D conversion unit, compensation device, EMS and shared energy storage coordination controller is added. The power integrated control module combines different dispatching channels, and different dispatching channels generate compensation control signals corresponding to different power quality controls, which can be used for voltage sag control, harmonic suppression, and voltage deviation capacity compensation to achieve distributed The active and reactive power of the shared energy storage subsystem can be quickly coordinated and dispatched to meet the diverse needs of users for power quality.

Further, the input terminals of the voltage collector and the current collector are connected to the three-phase terminal of the load on the user side; the output terminal of the voltage collector is connected to the input terminal of the voltage sag compensation device through the A/D conversion unit ;

The output end of the current collector is connected to the input end of the reactive power compensation device for dynamic harmonic suppression via an A/D conversion unit.

In this embodiment, the data collection unit is responsible for collecting distribution network information and user-side information, where the power grid information includes: time-based power grid electricity price information, weather information, distribution network node voltage information, distributed generator active power at each node , reactive power information, distribution network line resistance, reactance information, distribution network information includes: user-side planned load information, energy-saving service request signal, power quality management service request signal, user-side terminal three-phase voltage, current real-time Monitor information.

Further, the A/D conversion unit is used to convert the analog signal obtained by the data acquisition unit and the shared energy storage coordination controller into a data signal, and transmit it to the compensation device.

In this embodiment, the compensation device is responsible for generating charge and discharge power control signals for customized power diversified services, and can receive a series of data from the grid side, the user side, and the shared energy storage terminal, which can be sent to the internal voltage sag fast compensation device respectively , voltage deviation control device, and dynamic harmonic suppression reactive power compensation device, the active/reactive power required to generate voltage sag control services, harmonic control services, and voltage deviation control services are sequentially obtained through the built-in signal generation units of the three devices The power adjustment signal instruction is sent to the energy management system to execute the adjustment signal instruction.

Further, the voltage sag compensation device is used to generate an active power compensation control signal and a reactive power compensation control signal to deal with the voltage sag, and send them to the energy management system.

In this embodiment, the voltage sag fast compensation device is an electrical equipment such as an automatic electric control cabinet dedicated to voltage sag compensation, such as an RT-VSC voltage sag compensation device. The voltage sag fast compensation device has both fast analysis and fast compensation functions, receives real-time sampled voltage data, performs phase-locked tracking on the sinusoidal waveform of the user-side voltage, and judges the voltage sag of the target user. When the voltage sag occurs at the user terminal, the built-in signal generation unit quickly generates the active power compensation control signal and the reactive power compensation control signal to deal with the voltage sag, and then executes the active power compensation control signal and the reactive power compensation control signal through the EMS, The effect of fast compensation for voltage sag on the user side is achieved.

Further, the output end of the dynamic harmonic suppression reactive power compensation device is connected to the input end of the voltage sag compensation device, and the dynamic harmonic suppression reactive power compensation device is used to generate a reactive power compensation control signal for suppressing harmonics , and sent to the energy management system.

In this embodiment, the dynamic harmonic suppression reactive power compensation device is an electric equipment such as an automatic electric control cabinet dedicated to harmonic suppression reactive power compensation, such as a CY-DM series intelligent harmonic suppression capacitor compensation device. The dynamic harmonic suppression reactive power compensation device converts the harmonic components and fundamental reactive power components in the line current to Separated, the built-in signal generation unit quickly generates reactive power compensation control signals that suppress harmonics.

Further, the compensation device also includes a voltage deviation management device, and the data acquisition unit also includes a meteorological sensor installed on the user side load, and the voltage collector, current collector, and meteorological sensor in the data acquisition unit are respectively connected in sequence The voltage deviation control device, the energy management system, and the shared energy storage coordination controller constitute the third dispatching channel, which is used to generate a reactive power compensation control signal for controlling the user-side voltage deviation and send it to the energy management system.

In this embodiment, the voltage deviation management device is composed of a forecasting module, a power flow calculation module, and a reactive power compensation controller, wherein the forecasting module has built-in existing new energy forecasting programs and load forecasting programs, and the active power forecasting module can use the existing The meteorological information and the new energy output and load history information of each node can effectively predict the new energy output information and load information of each node in the future. The power flow calculation module is responsible for receiving these prediction information, the active/reactive power compensation capacity issued by the voltage sag fast compensation module and the dynamic harmonic suppression reactive power compensation module and the user's active charging and discharging power demand, and calculates the voltage change of the node where the user is located The trend is further output to the reactive power compensator to generate reactive power compensation control signals for controlling voltage deviation at multiple times in the future.

Further, the customized power integrated control module also includes a display terminal, which is connected to the energy management system and the shared energy storage coordination controller through an IO port, and is used to visualize the energy management system and the shared energy storage coordination controller. The energy storage coordinates the scheduling action of the controller, which is convenient for human monitoring and control.

Further, the shared energy storage coordination controller adopts the existing PCS coordinated and unified control framework, and is responsible for receiving the energy storage status monitoring data in the energy management system of each distributed energy storage subsystem, and according to the total charge from the energy management system The discharge command reasonably distributes the charging and discharging operations to each distributed energy storage subsystem to realize the coordinated distribution of distributed energy storage subsystems. In addition, the monitoring data is uniformly output to the A/D conversion unit, and then the customized power integrated control module The visualization module realizes the artificial monitoring and control of the distributed energy storage subsystem.

In this embodiment, the shared energy storage coordinating controller is respectively connected to PCS1~PCSn shown in FIG. Charge and discharge power control, using the remaining capacity of the inverter to provide customized power services such as reactive power correction voltage deviation, and voltage sag control.

The serial numbers in the above embodiments are for description only, and do not represent the sequence of the components during assembly or use.

The above is only an embodiment of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the utility model. within the scope of protection.

Claims (5)

1. A shared energy storage distributed dispatch system oriented to customized power services, the shared energy storage distributed dispatch system includes several distributed energy storage subsystems, user-side loads correspondingly connected to the distributed energy storage subsystems, and Customized power integrated control module, characterized in that the customized power integrated control module includes a data acquisition unit, a compensation device, an energy management system, and a shared energy storage coordination controller, and the compensation device includes a voltage sag compensation device and a dynamic harmonic Suppressing the reactive power compensation device, the data acquisition unit includes a voltage collector and a current collector; The voltage collector, the voltage sag compensation device, the energy management system, and the shared energy storage coordination controller are sequentially connected to form a first scheduling channel; the current collector, the dynamic harmonic suppression reactive power compensation device, the energy management system, and the shared energy storage The energy storage coordinating controllers are sequentially connected to form a second scheduling channel; the shared energy storage coordinating controllers are respectively connected to the charging and discharging power control switches of each distributed energy storage subsystem. 2. A shared energy storage distributed dispatching system oriented to customized power services according to claim 1, wherein the input ends of the voltage collector and the current collector are connected to the three-phase terminals of the user-side load; The output end of the voltage collector is connected to the input end of the voltage sag compensation device through an A/D conversion unit; The output end of the current collector is connected to the input end of the reactive power compensation device for dynamic harmonic suppression via an A/D conversion unit. 3. A shared energy storage distributed dispatch system oriented to customized power services according to claim 1, wherein the output end of the dynamic harmonic suppression reactive power compensation device is connected to the voltage sag compensation device input. 4. A shared energy storage distributed dispatching system oriented to customized power services according to claim 1, wherein the compensation device also includes a voltage deviation management device, and the data acquisition unit also includes a device installed on the user side The weather sensor of the load, the voltage collector, the current collector, and the weather sensor in the data acquisition unit are respectively connected to the voltage deviation management device, the energy management system and the shared energy storage coordination controller in sequence to form a third dispatching channel. 5. A shared energy storage distributed dispatching system oriented to customized power services according to claim 1, wherein the customized power integrated control module further includes a display terminal, and the display terminal is connected to the The energy management system and the shared energy storage coordinating controller are configured to visualize the scheduling actions of the energy management system and the shared energy storage coordinating controller.

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