CN210927124U - Wind farm group control system - Google Patents

Abstract

The utility model provides a wind farm field group control system, comprising: a fan controller, which is arranged on the wind power generator set of the wind farm, wherein the fan controller includes a single-machine interface; The booster station, the field group controller includes a stand-alone interface and a field-level interface; a VSG communication management machine is set at the booster station, and the VSG communication management machine includes a field-level interface; wherein, the field group control machine The stand-alone interface of the controller is connected in communication with the stand-alone interface of at least one fan controller, and the field-level interface of the VSG communication management machine is connected with the field-level interface of at least one field group controller. The system can combine the VSG with the wind farm group controller and can meet the primary frequency regulation time requirements of the power system.

Description

Wind farm group control system

technical field

The utility model relates to the technical field of wind power generation, in particular to a wind farm field group control system.

Background technique

In the prior art, a large-scale wind farm group usually consists of multiple wind farms connected to the same booster station in the power grid. Each wind farm includes dozens or hundreds of wind turbines, and the models of the units in a single wind farm can be the same. or different. In order to improve the safety and stability of the power grid and the rationality of the adjustment of the output of wind turbines, the wind farm group needs to actively participate in the primary frequency regulation of the power system and coordinate the power system to quickly adjust the power balance.

Due to the huge area of wind farms, the terrain conditions, wind conditions and working conditions of each unit are inconsistent at each location. Currently, a farm group controller is usually installed in each wind farm in the current industry to control each unit separately. The start and stop operation of the unit, active power output and reactive power output, etc.

A VSG (Virtual Synchronous Generator, virtual synchronous generator) system is also provided in the prior art, and through the control of the system, the wind turbine can simulate or partially simulate the frequency and voltage control characteristics of the synchronous generator from the external characteristics. However, the system communicates with the communication management devices that collect the information of the converters of multiple wind turbines through the conventional TCP/IP network communication method, and these communication management devices communicate with the following converters through the network or serial port MODUBS protocol; communication; The management device will convert the MODBUS communication to IEC104, IEC103 and other network TCP/IP communication protocols, and then connect to the main switch of the ring network in the station through the optical fiber ring network, and then connect to the VSG through the 2-3 switches. Multiple communication protocol conversions result in a response time of more than 2 minutes for the entire closed-loop control from the dispatch center. In the current industry, the response time of primary frequency modulation of photovoltaic, wind power and other new energy power stations is generally 15s to 20s. Obviously, the existing VSG system cannot meet the speed and performance requirements of primary frequency modulation of power systems.

Therefore, there is a need to provide a wind farm farm group control system that combines the VSG with the wind farm farm group controller and can meet the primary frequency modulation time requirement of the power system.

Utility model content

The embodiment of the present invention provides a wind farm field group control system, which can combine the VSG with the wind farm field group controller and can meet the primary frequency regulation time requirement of the power system.

The embodiment of the present invention provides a wind farm farm group control system, the system includes:

a fan controller, which is arranged on the wind power generator set of the wind farm, and the fan controller includes a stand-alone interface;

The farm group controller is arranged at the booster station connected to the wind farm bus line, and the farm group controller includes a stand-alone interface and a farm-level interface;

A VSG communication management machine is arranged at the booster station, and the VSG communication management machine includes a field-level interface;

Wherein, the stand-alone interface of the field group controller is connected in communication with the stand-alone interface of at least one fan controller, and the field-level interface of the VSG communication management machine is connected with the field-level interface of at least one field group controller.

In an embodiment of the present invention, real-time communication is performed between the field group controller and the fan controller based on the PROFINET protocol.

In an embodiment of the present invention, a master-slave control mode is adopted between the field group controller and the fan controller, the field group controller works as a PROFINET master station, and the fan controller works as a PROFINET slave station .

In an embodiment of the present invention, the farm group controller sends a single-machine active power adjustment instruction to a fan controller of a wind turbine that participates in frequency adjustment.

In an embodiment of the present invention, the communication between the VSG communication management machine and the field group controller is based on the OPC protocol.

In an embodiment of the present invention, a master-slave control mode is adopted between the VSG communication management machine and the field group controller, the VSG communication management machine works as a master station, and the field group controller works as a slave station .

In an embodiment of the present invention, the VSG communication management machine sends a field-level active power adjustment instruction to the field group controller.

In an embodiment of the present utility model, the system further includes a measurement and control device for collecting the power signal of the grid connection point of the booster station;

The measurement and control device is connected in communication with the VSG communication management machine, and sends the power signal of the grid connection point of the booster station to the VSG system.

In an embodiment of the present invention, the measurement and control device and the VSG communication management machine are communicatively connected through a serial communication interface.

The wind farm group control system provided by the embodiment of the present invention can control each unit in a large wind farm to reasonably control the active power output according to the terrain, wind condition and working condition characteristics of their respective locations and participate in the primary frequency regulation of the power system. The embodiment of the present utility model also adopts OPC protocol between the VSG communication management machine and the field group controller to be compatible with equipment of different manufacturers, the VSG communication management machine is set as the master station, the field group controller is set as the slave station, and the communication time period is less than 50ms; the PROFINET protocol is used between the farm group controller and each wind turbine, the farm group controller is set as the master station, and each unit is set as the slave station, the communication time period is less than 20ms, and the entire closed-loop control response time is less than 15s, which can Meet the power system primary frequency regulation time requirements.

Description of drawings

The features, advantages and technical effects of the exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a first structural schematic diagram of a wind farm farm group control system provided by an embodiment of the present invention;

FIG. 2 shows a second schematic structural diagram of a wind farm farm group control system provided by an embodiment of the present invention.

Detailed ways

The embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom end", "top end", etc. is based on the drawings. The orientation or positional relationship shown is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as affecting the present utility model. New type of restriction. Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a Removably connected, or integrally connected; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

FIG. 1 shows a first structural schematic diagram of a wind farm farm group control system provided by an embodiment of the present invention.

The system includes a fan controller 101, which is installed in the wind power generator set of the wind farm, and the fan controller 101 includes a single-machine interface 102; The controller 201 includes a stand-alone interface 202 and a field-level interface 203; a VSG communication management machine 301 is provided in the booster station, and the VSG communication management machine 301 includes a field-level interface 302; wherein, the stand-alone machine of the field group controller The interface 202 is connected in communication with the stand-alone interface 102 of the at least one fan controller, and the field-level interface 302 of the VSG communication management machine is connected with the field-level interface 203 of the at least one field group controller. The VSG communication manager 301 is in communication connection with the VSG virtual synchronous generator system.

Based on the communication architecture shown in Figure 1, the farm group control system integrates the control functions of the virtual synchronous generator VSG and the farm-level controller, and can control each unit in a large wind farm according to the terrain, wind conditions and working conditions of its respective location. The active power output control is reasonably carried out to participate in the primary frequency regulation of the power system.

Wherein, real-time communication is performed between the farm group controller 201 and the fan controller 101 based on the PROFINET protocol. Depending on the response time, PROFINET supports three communication methods: TCP/IP standard communication, real-time (RT) communication and synchronous real-time (IRT) communication. In this example, the real-time (RT) communication mode of the PROFINET protocol is used between the farm group controller 201 and the fan controller 101, and the real-time communication channel based on the Ethernet Layer 2 (Layer 2) reduces the amount of data in the communication stack. processing time. In a preferred example, the communication time between the farm group controller 201 and the fan controller 101 is within 20ms.

The master-slave control mode is adopted between the farm group controller 201 and the fan controller 101, the farm group controller 201 works as a PROFINET master station, and the fan controller 101 works as a PROFINET slave station. The farm group controller 201 sends the single-machine active power adjustment instruction to the wind turbine controller 101 of the wind power generator participating in the frequency adjustment. It should be noted that this control method utilizes the farm group controller 201 to cooperate with the VSG virtual synchronous generator system to realize the frequency adjustment of the entire wind farm. The farm group controller 201 identifies the operating conditions and health status of each wind turbine within the control range, and selects some or all of the wind turbines to participate in frequency adjustment. Based on the wind conditions and output status of each unit, the active power adjustment commands for each unit can be the same or different.

In FIG. 1 , communication between the VSG communication manager 301 and the field group controller 201 is performed based on the OPC protocol. Since the VSG communication management machine 301 and the field group controller 201 are both set in the booster station, the communication distance between the two is relatively short, and it is not necessary to consider the problem of communication delay. Because the VSG communication management machine and farm group controller are usually equipment provided by different suppliers, especially for large wind farm groups, the three wind farms shown in Figure 1 are connected to the same booster station, and the three wind farm groups are connected to the same booster station. The controllers are hardware platforms provided by different vendors. For this reason, in this example, the communication between the VSG communication manager 301 and the field group controller 201 is based on the OPC (Object Linking and Embedding for Process Control) protocol, which is compatible with hardware from various suppliers. and system to realize a system configuration that does not depend on hardware.

The master-slave control mode is adopted between the VSG communication management machine 301 and the field group controller 201 , the VSG communication management machine works as a master station, and the field group controller works as a slave station. The VSG communication manager 301 sends field level active power adjustment commands to each field group controller 201 . Among them, the field-level active power adjustment command indicates the sum of the active power output that each wind farm needs to provide.

In one example, in order to meet the time requirement of one frequency modulation, the communication time period between the VSG communication manager 301 and the field group controller 201 is less than 50ms.

In an embodiment of the present invention, the wind farm group control system provided by the embodiment of the present invention may further include a measurement and control device 401 for collecting power signals of the grid connection point of the booster station. The measurement and control device 401 is connected in communication with the VSG communication management machine 301, and sends the power signal of the grid connection point of the booster station to the VSG system. As shown in FIG. 2 , FIG. 2 shows a second schematic structural diagram of a wind farm farm group control system provided by an embodiment of the present invention.

In an embodiment of the present invention, the measurement and control device 401 and the VSG communication management machine 301 may be communicatively connected through a serial communication interface.

The measurement and control device 401 collects power signals such as voltage or current information at the grid connection point, and is used for the VSG system to calculate voltage, current, active power, reactive power, power factor and frequency, etc. The measurement and control device 401 can also be connected to the digital input and output of external capacitors and reactances Signal. The VSG system executes control strategies such as voltage regulation and frequency regulation, and sends corresponding control instructions to the VSG communication management machine 301 , and the VSG communication management machine 301 controls the fan controller in real time based on the control instructions.

In an example, the communication time between the measurement and control device 401 and the VSG communication management machine 301 is controlled within 50ms.

In the embodiment of the present invention, the OPC protocol is used between the VSG communication management machine and the field group controller to be compatible with equipment from different manufacturers. The VSG communication management machine is set as the master station, the field group controller is set as the slave station, and the communication time period is less than 50ms. ; The PROFINET protocol is adopted between the farm group controller and each wind turbine, the farm group controller is set as the master station, each unit is set as the slave station, and the communication time period is less than 20ms; the measurement and control device 401 and the VSG communication management machine 301 The communication time between them is controlled within 50ms; thus the response time of the entire closed-loop control is less than 15s, which can meet the primary frequency regulation time requirements of the power system.

While the invention has been described with reference to the preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (9)

1. A wind farm farm group control system, wherein the system comprises: a fan controller, which is arranged on the wind power generator set of the wind farm, and the fan controller includes a stand-alone interface; The farm group controller is arranged at the booster station connected to the wind farm bus line, and the farm group controller includes a stand-alone interface and a farm-level interface; A VSG communication management machine is arranged at the booster station, and the VSG communication management machine includes a field-level interface; Wherein, the stand-alone interface of the field group controller is connected in communication with the stand-alone interface of at least one fan controller, and the field-level interface of the VSG communication management machine is connected with the field-level interface of at least one field group controller. 2 . The system according to claim 1 , wherein real-time communication is performed between the field group controller and the fan controller based on the PROFINET protocol. 3 . 3. The system according to claim 2, wherein a master-slave control mode is adopted between the field group controller and the fan controller, the field group controller works as a PROFINET master station, and the fan controller Works as PROFINET slave. 4 . The system according to claim 2 , wherein the farm group controller sends a single-machine active power adjustment instruction to the fan controller of the wind power generating set participating in the frequency adjustment. 5 . 5 . The system according to claim 1 , wherein the communication between the VSG communication management machine and the field group controller is based on the OPC protocol. 6 . 6. The system according to claim 5, wherein a master-slave control mode is adopted between the VSG communication management machine and the field group controller, the VSG communication management machine works as a master station, and the field group controls The device works as a slave. 7 . The system according to claim 5 , wherein the VSG communication management machine sends a field-level active power adjustment command to the field group controller. 8 . 8. The system according to claim 1, characterized in that, the system further comprises a measurement and control device for collecting the power signal of the grid connection point of the booster station; The measurement and control device is connected in communication with the VSG communication management machine, and sends the power signal of the grid connection point of the booster station to the VSG system. 9 . The system according to claim 8 , wherein the measurement and control device is communicatively connected to the VSG communication management machine through a serial communication interface. 10 .

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