WO2018113683A1

WO2018113683A1 - Energy storage cluster control system and energy storage system

Info

Publication number: WO2018113683A1
Application number: PCT/CN2017/117279
Authority: WO
Inventors: 张建兴
Original assignee: 蔚来汽车有限公司
Priority date: 2016-12-19
Filing date: 2017-12-19
Publication date: 2018-06-28
Also published as: CN106877370A

Abstract

An energy storage cluster control system and an energy storage system. An energy storage cluster control system (20) is used for frequency modulation of a generating set of a power grid. In the control system, an energy storage cluster controller (21) is used for receiving an adjusting power value and a frequency modulation control instruction as well as real-time current capacity and state of an energy storage unit, receiving information about an energy storage current transformer (23) and a battery management system (24) in real time, and sending a first instruction to an energy storage unit controller (22). The energy storage unit controller is used for receiving the first instruction and the information sent from the energy storage current transformer and the battery management system for determination to generate a first control signal, and sending the first control signal to the energy storage current transformer for charge and discharge control. The energy storage current transformer is used for receiving the first control signal, and sending the information about internal and external devices to the energy storage unit controller in time. The energy storage cluster control system and the energy storage system resolve the technical problem of how to meet quick real-time property and synchronism of the frequency modulation control requirements of a platform architecture having a plurality of energy storage units connected in parallel and a generating set.

Description

Energy storage cluster control system and energy storage system

Technical field

The invention relates to the technical field of power system frequency modulation, in particular to an energy storage cluster control system and an energy storage system.

Background technique

At present, based on the rapid development of power grids, the requirements for power system frequency modulation units are gradually improved. The battery energy storage system has fast bidirectional power regulation capability, which can meet the requirements of high frequency short-time fast bidirectional power regulation. Therefore, the energy storage system is used to assist the generator set frequency modulation. A new technology development and application trend.

Based on the technical characteristics and safety considerations of the battery energy storage system, it is not appropriate to use a single-machine large-scale battery in parallel to form a large-capacity energy storage system. The power demand of the generator set for the energy storage system is large, so it is necessary to adopt multiple medium-sized The capacity energy storage units are connected in parallel to meet the total power regulation requirements of the system. Taking into account the rapid response requirements of grid frequency modulation, the energy storage system as a whole must meet the rapid response speed of the unit frequency modulation. How to design an energy storage cluster control system based on parallel connection of multiple energy storage units, and meet the rapid real-time and synchronization of the frequency modulation requirements of the generator set, which has become an urgent problem to be solved in the development of energy storage technology for generator set frequency modulation. .

In view of this, the present invention has been specifically proposed.

Summary of the invention

In order to solve the above problems in the prior art, in order to solve the technical problem of how to meet the platform architecture of multiple energy storage units in parallel and the rapid real-time and synchronization of the modulo frequency modulation control requirements, a frequency modulation for the power grid generator set is provided. Energy storage cluster control system. In addition, an energy storage system is also provided.

In order to achieve the above object, on the one hand, the following technical solutions are provided:

An energy storage cluster control system for frequency regulation of a power grid generator set, characterized in that the system comprises: an energy storage cluster controller, an energy storage unit controller, an energy storage converter and a battery management system; wherein:

The energy storage cluster controller is configured to receive an adjustment power value and a frequency modulation control instruction, and a current capacity and state of the energy storage unit in real time, and receive information of the energy storage converter and the battery management system in real time, and The energy storage unit controller sends a first instruction;

The energy storage unit controller is configured to receive the first instruction sent by the energy storage cluster controller, and information sent by the energy storage converter and the battery management system, and perform judgment a control signal, and transmitting the first control signal to the energy storage converter for charging and discharging control;

The energy storage converter is configured to receive the first control signal, perform control protection according to information of internal and external devices, and send information of the internal and external devices to the energy storage unit controller in time.

Further, the power grid includes an automatic power generation control scheduling device, wherein the energy storage cluster controller performs point-to-point communication with the automatic power generation control scheduling device through an optical fiber real-time Ethernet.

Further, the adjusted power value and the FM control command are sent by the automatic power generation control scheduling device to the energy storage cluster controller.

Further, the energy storage cluster controller is configured with an N-channel optical real-time Ethernet interface for communicating with the energy storage unit controller in a point-to-point communication manner; wherein the N takes a positive integer.

Further, the energy storage unit controller is disposed on a near side of the energy storage cluster controller, and the energy storage unit controller and the energy storage cluster controller are connected by an industrial field bus.

Further, the industrial field bus is a CAN bus.

Further, the energy storage cluster control system is divided into three layers, wherein the top layer includes an energy storage cluster controller, the middle layer includes an energy storage unit controller, and the bottom layer includes an energy storage converter and a battery management system.

Further, in the three-layer architecture, the next layer is controlled by the upper layer, and when the upper layer fails, the next layer can keep the instructions received before the fault run independently.

In order to achieve the above object, on the other hand, an energy storage system is also provided. The energy storage system includes any of the above energy storage cluster control systems.

Further, the energy storage system further includes two or more energy storage units arranged in parallel, each energy storage unit includes a plurality of branches, each of which includes an energy storage converter, an energy storage battery, and a battery management. system.

Embodiments of the present invention provide an energy storage cluster control system and an energy storage system. The energy storage cluster control system is used for frequency regulation of the power grid generator set, and includes: an energy storage cluster controller, an energy storage unit controller, and an energy storage converter and a battery management system; wherein the energy storage cluster controller is configured to receive the regulated power The value and frequency control commands and the current capacity and state of the energy storage unit in real time, as well as real-time receipt of information of the energy storage converter and the battery management system, and send a first command to the energy storage unit controller. The energy storage unit controller is configured to receive the first instruction sent by the energy storage cluster controller and the information sent by the energy storage converter and the battery management system, perform determination, generate a first control signal, and send the first control signal to The energy storage converter performs charge and discharge control. The energy storage converter is configured to receive the first control signal, and perform control protection according to the information of the internal and external devices, and timely send the information of the internal and external devices to the energy storage unit controller. Through this technical solution, the distributed design and reasonable functions of the system are divided into energy storage cluster controller, energy storage unit controller, energy storage converter and battery management system, which solves how to meet multiple energy storage units in parallel. The platform architecture and the technical problems of fast real-time and synchronization of the modulo frequency modulation control requirements have high reliability.

DRAWINGS

1 is a schematic structural view of an energy storage system;

2 is a schematic structural diagram of an energy storage cluster control system according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an energy storage cluster control system according to another embodiment of the present invention.

detailed description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the scope of the present invention.

The basic idea of the embodiment of the present invention is to adopt a layered distributed design idea, based on the fiber-optic Ethernet technology and the industrial field bus technology, to design and control the communication network of the control system.

The energy storage cluster control system of the embodiment of the invention can be applied to an energy storage system in which two or more energy storage units are connected in parallel. Each of the energy storage units can operate independently of each other but is controlled by the upper layer control system. Each energy storage unit comprises a plurality of branches, each of which is composed of a stored energy storage converter (PCS) and a stored energy battery and a battery management system (BMS); the energy storage converter (PCS) realizes charging of the battery. Discharge management, battery management system (BMS) to achieve monitoring of energy storage batteries; each branch can run independently of each other but controlled by the upper layer control system.

Fig. 1 exemplarily shows a schematic structural view of an energy storage system. Among them, the energy storage system includes generator, high plant change, excitation change, main transformer and No. 1 energy storage unit, No. 2 energy storage unit... No. N energy storage unit.

The existing energy storage cluster control system scheme is generally designed for multiple equipments. The control system is connected by multiple traditional control devices. There are multiple data conversion devices in the middle. The real-time and synchronization of the network is poor, which can not meet the frequency modulation of the unit. Fast real-time and synchronization requirements.

To this end, an embodiment of the present invention provides an energy storage cluster control system for frequency modulation of a power grid generator set. As shown in FIG. 2, the energy storage cluster control system 20 includes an energy storage cluster controller (ECS) 21, an energy storage unit controller (EMU) 22, an energy storage converter (PCS) 23, and a battery management system (BMS). )twenty four. among them:

The energy storage cluster controller 21 is configured to receive the adjusted power value and the frequency modulation control instruction and the current capacity and state of the energy storage unit in real time, receive the information of the energy storage converter 23 and the battery management system 24 in real time, and send the information to the energy storage unit controller. Send the first instruction.

In this embodiment, the adjusted power value and the FM control command may be sent to the energy storage cluster controller through the automatic power generation control scheduling device.

The energy storage unit controller 22 is configured to receive the first instruction sent by the energy storage cluster controller 21 and the information sent by the energy storage converter 23 and the battery management system 24, perform determination, generate a first control signal, and The first control signal is sent to the energy storage converter for charge and discharge control.

The energy storage converter 23 is connected to the battery management system 24 and is configured to receive the first control signal and perform control protection according to the information of the internal and external devices, and timely transmit the information of the internal and external devices to the energy storage unit controller 22.

Through the embodiment of the invention, the distributed design and reasonable functions of the system are divided into an energy storage cluster controller, an energy storage unit controller, an energy storage converter and a battery management system, which solves how to meet multiple energy storage units in parallel. The platform architecture and the technical problems of fast real-time and synchronization of the genset frequency modulation control requirements have high reliability.

In some embodiments, the energy storage cluster controller communicates point-to-point with the automatic power generation control dispatch device via fiber optic real-time Ethernet.

By adopting the optical fiber real-time Ethernet, the embodiment of the invention can ensure the reliability and strong anti-interference of the data transmission under the strong electromagnetic interference environment of the power station site.

In some embodiments, the energy storage cluster controller is configured with an N-way fiber optic real-time Ethernet interface for communicating with the energy storage unit controller in a point-to-point communication manner. Where N takes a positive integer.

In this embodiment, by connecting N optical fiber real-time Ethernet interfaces (ie, LAN-1 to LAN-N) to the energy storage unit controller of each energy storage unit, the multi-channel optical real-time Ethernet ensures reliable output transmission. Sex, real-time and synchronism, thus, the time synchronization error of data transmission between N channels is controlled at the microsecond level, and the data delay time is also in the microsecond level.

In some embodiments, the energy storage unit controller is disposed on the near side of the energy storage cluster controller, and the energy storage unit controller and the energy storage cluster controller are connected by an industrial fieldbus CAN bus.

In this embodiment, by adopting the industrial field bus CAN bus mode, the complexity of the network is reduced, real-time rapid control is realized, and the branches formed by the energy storage unit controller and each energy storage cluster controller are connected to one bus, The time synchronization error of data transmission between the branches is controlled to the millisecond level, and the data delay time is also in the order of milliseconds.

In some embodiments, the energy storage cluster control system can be divided into three layers, wherein the top layer includes an energy storage cluster controller, the middle layer includes an energy storage unit controller, and the bottom layer includes an energy storage converter and a battery management system.

Through the above division, the structure of the energy storage cluster control system is more clear.

Further, in the above three-layer architecture, the next layer is controlled by the upper layer, and when the upper layer fails, the next layer can keep the instructions received before the fault operate independently.

Through the control between the above layers, the energy storage cluster control system can be highly reliable.

The invention will now be described in detail by way of a preferred embodiment.

As shown in FIG. 3, the preferred embodiment adopts a three-layer architecture, which is divided into a top-level centralized control layer, a middle layer-unit control layer, and a bottom layer-device control layer. The top device is an energy storage cluster controller (ECS), the middle device is an energy storage unit controller (EMU) for each energy storage unit, and the bottom device is a storage energy converter (PCS) and a battery for all energy storage units. Management System (BMS) equipment.

Among them, the ECS and AGC scheduling device (ie, the grid automatic power generation control scheduling device) performs point-to-point communication through the fiber optic real-time Ethernet LAN-0. The ECS decomposes the instruction according to the adjusted power value and the FM control command issued by the AGC scheduling device, and the current capacity and state uploaded by each energy storage unit in real time, and delivers the decomposed instruction to the middle storage unit controller. (EMU). The ECS has an N-way fiber-optic real-time Ethernet interface for connecting to the mid-tier EMU, which is connected to each energy storage unit (EMU) via LAN-1 to LAN-N in a point-to-point communication mode. The energy storage unit controller (EMU) of each energy storage unit is arranged in the vicinity of the energy storage cluster controller (PCS) equipment in the energy storage unit, and the energy storage unit controller (EMU) and the energy storage cluster control in the energy storage unit are controlled. The devices (PCS) are connected by an industrial fieldbus CAN bus, and each branch is connected to a bus. After the energy storage cluster controller (EMU) of each energy storage unit receives the instruction of the energy storage cluster controller (ECS), it integrates the information sent by the bottom energy storage converter (PCS) of the energy storage unit and the BMS connected thereto. After the judgment, the instruction is sent to the bottom energy storage converter (PCS) device for charging and discharging control, and the energy storage cluster controller (EMU) receives and monitors the information of the underlying PCS and BMS of the energy storage unit in real time. The underlying PCS device receives the instructions of the middle layer EMU and controls and protects according to the information of the internal and external devices, and sends the information to the middle layer in time.

In the control process, the layers are controlled from top to bottom and the lower layer has a certain degree of independence, that is, the next layer is controlled by the upper layer, but after the failure of the upper layer, the lower layer can remain in front of the fault. Received instructions operate independently of each other.

The embodiment of the present invention adopts the above technical solution to adopt a layered and distributed control system communication network structure design and reasonable function division, and realizes a platform structure of a plurality of energy storage units in parallel energy storage cluster control system; the data transmission distance is long The power station that is susceptible to electromagnetic interference utilizes point-to-point communication mode and uses fiber-optic real-time Ethernet to ensure data transmission reliability, fast real-time and synchronization. The industrial fieldbus CAN bus mode is adopted on the energy storage unit equipment side, which reduces The complexity of the network realizes real-time fast control. In addition, the communication delay and synchronization error are controlled in the millisecond level, which is much higher than the control requirement of the unit's FM response time and synchronization, which can meet the unit's primary frequency modulation and secondary frequency modulation. demand.

It should be noted that, in the embodiment of the present invention, the number of the energy storage cluster controller, the energy storage unit controller, the energy storage converter, and the battery management system is not limited, and any number of energy storage clusters may be controlled in FIG. 2-3. Controller, energy storage unit controller, and energy storage converter and battery management system.

Heretofore, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings, but it is obvious to those skilled in the art that the scope of the present invention is obviously not limited to the specific embodiments. Those skilled in the art can make equivalent changes or substitutions to the related technical features without departing from the principles of the present invention, and the technical solutions after the modifications or replacements fall within the scope of the present invention.

Claims

An energy storage cluster control system for frequency regulation of a power grid generator set, characterized in that the system comprises: an energy storage cluster controller, an energy storage unit controller, an energy storage converter and a battery management system; wherein:

The energy storage cluster controller is configured to receive an adjustment power value and a frequency modulation control instruction, and a real-time capacity and state of the energy storage unit, and receive information of the energy storage converter and the battery management system in real time, and Said energy storage unit controller sends a first instruction;

The energy storage unit controller is configured to receive the first instruction and information sent by the energy storage converter and the battery management system, perform determination, generate a first control signal, and Control signals are sent to the energy storage converter for charge and discharge control;

The energy storage converter is connected to the battery management system and configured to receive the first control signal, and perform control protection according to information of internal and external devices, and timely send information of the internal and external devices to the Energy storage unit controller.
The energy storage cluster control system according to claim 1, wherein the power grid comprises an automatic power generation control scheduling device, and the energy storage cluster controller performs point-to-point communication with the automatic power generation control scheduling device via an optical fiber real-time Ethernet.
The energy storage cluster control system according to claim 2, wherein said adjusted power value and said frequency modulation control command are transmitted by said automatic power generation control scheduling device to said energy storage cluster controller.
The energy storage cluster control system according to claim 1, wherein the energy storage cluster controller is configured with an N-channel optical real-time Ethernet interface for communicating with the energy storage unit controller in a point-to-point communication manner; Wherein, the N takes a positive integer.
The energy storage cluster control system according to claim 1, wherein the energy storage unit controller is disposed on a near side of the energy storage cluster controller, and the energy storage unit controller and the energy storage device are The cluster controllers are connected by an industrial fieldbus.
The energy storage cluster control system according to claim 5, wherein said industrial field bus is a CAN bus.
The energy storage cluster control system according to claim 1, wherein the energy storage cluster control system is divided into three layers, wherein the top layer comprises an energy storage cluster controller, and the middle layer comprises an energy storage unit controller, and the bottom layer comprises Energy storage converter and battery management system.
The energy storage cluster control system according to claim 7, wherein in the three-tier architecture, the next layer is controlled by the upper layer, and when the upper layer fails, the next layer is The instructions received before the fault is maintained are operating independently.
An energy storage system, comprising the energy storage cluster control system of any of the preceding claims 1-8.
The energy storage system according to claim 9, comprising two or more energy storage units arranged in parallel, each energy storage unit comprising a plurality of branches, each branch comprising an energy storage converter , energy storage battery and battery management system.