A real-time simulation system building method based on voltage source type wind turbine generator

Abstract

The application discloses a kind of based on voltage source type wind turbine's real-time simulation system construction method, comprising the following steps: S1, based on RTLab simulation platform establishes wind turbine aerodynamic-mechanical-electricity combined simulation model;S2, configuration data interface, set protocol converter, complete the information interaction between RTLab simulation platform, fan controller and converter controller;S3, according to actual simulation demand, set corresponding voltage source type wind turbine coordination control strategy;S4, by the configuration of software and hardware parameters, provide different system simulation scene, build multi-scene real-time simulation platform;S5, set man-machine interface, process simulation data.The application establishes wind turbine aerodynamic-mechanical-electricity combined simulation model, configures each part communication protocol, sets corresponding control strategy, builds multi-scene real-time simulation platform, develops man-machine interface, realizes the quick switching of simulation scene, more realistically simulates actual power system state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine simulation platform construction, and particularly relates to a real-time simulation system construction method based on a voltage source type wind turbine. BACKGROUND

[0002] The voltage source type wind turbine is a formed wind turbine, which can autonomously adjust active power and reactive power output through collected grid frequency and voltage to actively support system frequency / voltage. However, the current source type wind turbine widely promoted at present depends on the power command issued by the main control for power response and cannot autonomously respond. Moreover, the original control strategy is no longer applicable to the cooperation strategy between the main control and the converter at present, and the cooperation strategy between the main control and the converter needs to be coordinated and optimized.

[0003] The wind turbine is a large-scale system with complex structure, and its aerodynamics, mechanical components, generator, converter and other electrical systems all have important influence on the grid-connected performance of the whole machine. The existing simulation technology is based on a single simulation platform, which cannot accurately reflect the electrical and mechanical characteristics of the wind turbine and the mutual influence between the mechanical system and the electrical system at the same time, and moreover, an equivalent grid model is mostly used, which cannot accurately simulate the influence of the grid operation state on the operation of each component of the wind turbine.

[0004] A wind turbine simulation system disclosed in Chinese patent document CN112859637A includes a wind turbine simulation software, a wind turbine simulation hardware, a PLC control module and a connection port, the connection port includes a wind turbine physical connection port, a wind turbine physical port communication module is configured in the wind turbine simulation software, and the wind turbine physical port communication module controls data communication between the wind turbine physical connection port and the wind turbine physical object. However, the Chinese patent CN112859637A does not involve the corresponding control strategy, and cannot solve the above problems. SUMMARY

[0005] The present application solves the problems of poor accuracy and real-time performance of the existing simulation technology, poor coordinated control of frequency and voltage regulation between the main control and the converter, and proposes a real-time simulation system construction method based on a voltage source type wind turbine, establishes a wind turbine aerodynamic-mechanical-electrical combined simulation model, configures the communication protocols of each part, sets the corresponding control strategy, builds a multi-scenario real-time simulation platform, develops a human-computer interaction interface, and realizes rapid switching of the simulation scene and more realistic simulation of the actual power system state.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a real-time simulation system construction method based on a voltage source type wind turbine, comprising the following steps:

[0007] S1, a wind turbine aerodynamic-mechanical-electric joint simulation model is established based on an RTLab simulation platform;

[0008] S2, a data interface is configured, a protocol converter is set, and information interaction between the RTLab simulation platform, the wind turbine controller and the converter controller is completed;

[0009] S3, according to actual simulation requirements, a corresponding voltage source type wind turbine coordinated control strategy is set;

[0010] S4, different system simulation scenes are provided through software and hardware parameter configuration, and a multi-scene real-time simulation platform is built;

[0011] S5, a man-machine interface is set, and simulation data is processed.

[0012] The real-time simulation system building method based on the voltage source type wind turbine of the application first establishes a wind turbine aerodynamic-mechanical-electric joint simulation model, then configures communication protocols of each part, after the configuration is completed, according to different actual requirements, a corresponding control strategy is set, and a multi-scene real-time simulation platform is built, and a man-machine interface is set; the application more accurately simulates the influence of the power grid operation state on the operation of each component of the wind turbine.

[0013] As preferred, the step S3 comprises the following steps:

[0014] S31, when the system frequency fluctuates, the active power ΔP autonomously increased by the voltage source type wind turbine is calculated, and the actual active power P, the increased active power ΔP and the information of the unit speed n are fed back to the unit main control by the converter controller;

[0015] S32, the unit main control calculates the given torque T cmd according to the feedback of the converter controller, and compares it with the feedback torque T b .

[0016] In the application, the unit main control can calculate the given torque T cmd according to the electrical parameters fed back by the converter controller, and compare it with the feedback torque T b .

[0017] As preferred, the establishment process of the wind turbine aerodynamic-mechanical-electric joint simulation model comprises the following steps:

[0018] S11, in the aerodynamic model, a wind speed model is established by using average wind speed and transverse, longitudinal and vertical turbulence intensity, and a high-order nonlinear model is used to describe the wind wheel model;

[0019] S12, in the mechanical model, a double mass block model is adopted for modeling, wherein the inertia of the wind turbine is connected with the inertia of the rotor of the generator through a shaft system;

[0020] S13, in the electrical model, a doubly-fed asynchronous motor model is adopted for modeling, the rotor dq-axis current is controlled through a converter, and an infinite power source is used to simulate a real power grid;

[0021] S14, in the hardware control device, signal lines are connected and functions are configured for the wind turbine controller and the converter controller.

[0022] In the application, the wind turbine generator set aerodynamic-mechanical-electrical combined simulation model mainly comprises an aerodynamic model, a mechanical model, an electrical model and a hardware control device.

[0023] As preferred, the step S2 comprises the following steps:

[0024] S21, a communication mode between corresponding devices is set, wherein the wind turbine controller and the RTLab simulation platform adopt an Ethernet communication protocol, the wind turbine controller and the converter controller adopt a Can communication protocol, and the converter controller and the RTLab simulation platform adopt analog and data IO;

[0025] S22, an interface configuration between communication protocols is modified, appropriate interface parameters are selected, and a corresponding protocol converter is developed;

[0026] S23, variable information is configured to be transmitted, and signal amounts transmitted between two devices are respectively configured according to the operation and control requirements of the RTLab simulation platform, the wind turbine controller and the converter controller.

[0027] In the application, the wind turbine controller transmits signal amounts such as torque given value and reactive power instruction to the converter controller, and transmits signal amounts such as rotating speed and wind turbine operation state to the RTLab; the converter controller transmits signal amounts such as torque feedback value, current and voltage, active and reactive power feedback to the wind turbine controller, and transmits signal amounts such as PWM signal and switch command to the RTLab; the RTLab transmits signal amounts such as power grid frequency and voltage to the wind turbine controller, and transmits signal amounts such as switch feedback and code disc to the converter controller.

[0028] As preferred, the active power ΔP autonomously increased by the voltage source type wind turbine generator set is expressed as:

[0029] ΔP=(f-f g )·K ω

[0030] In the formula, f g is a system rated frequency, f is a real-time frequency of a power grid, and K ω is a frequency-active droop coefficient.

[0031] In the application, the active power ΔP autonomously increased by the voltage source type wind turbine generator can be used for feedback torque T b Calculation.

[0032] As preferred, the given torque T cmd The contrast judgment basis of feedback torque T b Is:

[0033] |T cmd -(P-ΔP)·n|≤T dz

[0034] T b =(P-ΔP)·n

[0035] In the formula, T dz Is the torque protection threshold, if the deviation of given torque T cmd And feedback torque T b Is greater than T dz , torque mismatch protection is triggered.

[0036] In the application, if the deviation of given torque T cmd And feedback torque T b Is less than or equal to T dz , torque mismatch protection is not triggered.

[0037] As preferred, the step S4 is specifically:

[0038] According to different simulation requirements, set different voltage levels, different fan capacities, different motor parameters, different main loop parameters and the joint simulation integrated model of topology, realize the rapid switching of simulation scene through software parameter configuration.

[0039] In the application, system scene models under different power grid disturbance / fault conditions can also be built, to provide more real simulation verification scenes for control strategy design.

[0040] As preferred, the step S5 includes the following steps:

[0041] S51, write human-computer interaction interface software, set Ads communication protocol connected with fan controller;

[0042] S52, set human-computer interaction UI interface, and the variable state observed by each component of the fan is displayed;

[0043] S53, set the log function of human-computer interaction interface, add the observed variable information, collect and store the simulation data and save as.csv file, export from the system internal to process and analyze;

[0044] S54, set the control instruction interface of the man-machine interaction interface, combine the log file processing analysis result, and issue corresponding control instructions to the fan to optimize the running state thereof;

[0045] S55, set the fault monitoring function of the man-machine interaction interface.

[0046] In the application, the man-machine interaction interface is set to collect and monitor simulation data, and to perform early data processing and control; the Ads communication is connected with the fan controller to realize visual monitoring of the power grid state and the converter state, and to perform corresponding device control actions.

[0047] The application has the following beneficial effects:

[0048] 1. The real-time simulation system building method based on the voltage source type wind turbine of the application realizes fast switching of the simulation scene through software parameter configuration, and provides a more real simulation verification scene for the setting of the control strategy.

[0049] 2. The coordination control strategy between the main control and the converter of the voltage source type wind turbine is optimized to prevent abnormal power tracking.

[0050] 3. The simulation system established by the application can not only accurately reflect the electrical characteristics and mechanical characteristics of the wind turbine, and the mutual influence between the mechanical system and the electrical system, but also accurately simulate the influence of the power grid running state on the operation of each component of the wind turbine. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a flowchart of the real-time simulation system building method based on the voltage source type wind turbine of the application;

[0052] Figure 2 is a system schematic diagram of the wind turbine aerodynamic-mechanical-electrical combined simulation model of the real-time simulation system building method based on the voltage source type wind turbine of the application. DETAILED DESCRIPTION

[0053] Embodiment:

[0054] The embodiment provides a real-time simulation system building method based on a voltage source type wind turbine, referring to Figure 1 , and includes the following multiple steps.

[0055] Referring to Figure 2 For step S1, first, a wind turbine aerodynamic-mechanical-electrical combined simulation model is established based on an RTLab simulation platform; specifically, for the establishment of the model, the following steps are mainly included.

[0056] Step S11, in the aerodynamic model, a wind speed model is established by using average wind speed and transverse, longitudinal and vertical turbulence intensity, and a high-order nonlinear model is used to describe the wind wheel model; specifically, the aerodynamic model includes a wind model, a blade aerodynamic model and a rotor unit model.

[0057] Step S12, in the mechanical model, a double-mass block model is used for modeling, in which the inertia of the wind turbine is connected to the inertia of the generator rotor through a shaft system; specifically, the mechanical model includes a main shaft model, a gear box model and a high-speed shaft model.

[0058] Step S13, in the electrical model, a double-fed asynchronous motor model is used for modeling, and the rotor dq-axis current is controlled by a converter; an infinite power source is used to simulate the real power grid; specifically, the electrical model includes a motor model, a wind power converter model and a power grid model.

[0059] Step S14, in the hardware control device, signal lines are connected and functions are configured for the wind turbine controller and the converter controller.

[0060] Step S2, configure the data interface, set the protocol converter, and complete the information exchange between the RTLab simulation platform, the wind turbine controller and the converter controller; specifically, the specific process of step S2 also includes the following sub-steps.

[0061] Step S21, first, set the communication mode between multiple devices; specifically, the wind turbine controller and the RTLab simulation platform use Ethernet communication protocol, the wind turbine controller and the converter controller use Can communication protocol, and the converter controller and the RTLab simulation platform use analog and data IO.

[0062] Step S22, modify the interface configuration between the communication protocols, select appropriate interface parameters, and develop corresponding protocol converters; to realize mutual communication between the RTLab simulation platform, the wind turbine controller and the converter controller, and realize signal transmission.

[0063] Step S23, configure the transmission variable information, according to the operation and control requirements of the RTLab simulation platform, the wind turbine controller and the converter controller, configure the signal amount transmitted between each other; specifically, the wind turbine controller transmits torque given value, reactive power instruction and other signal amounts to the converter controller, and transmits speed, wind turbine operation state and other signal amounts to the RTLab; the converter controller transmits torque feedback value, current and voltage, active and reactive feedback and other signal amounts to the wind turbine controller, and transmits PWM signal, switch command and other signal amounts to the RTLab; the RTLab transmits power grid frequency, voltage and other signal amounts to the wind turbine controller, and transmits switch feedback, code disc and other signal amounts to the converter controller.

[0064] Step S3, according to the actual simulation requirements, set the corresponding voltage source type wind turbine coordinated control strategy; specifically, the specific setting steps include the following multiple sub-steps.

[0065] Step S31, when the system frequency fluctuates, the active power ΔP autonomously increased by the voltage source type wind turbine is calculated, and the converter controller feeds back the information of the actual active power P, the increased active power ΔP and the unit speed n to the unit main control; specifically, for the calculation formula of the active power ΔP autonomously increased by the voltage source type wind turbine, the following formula is used:

[0066] ΔP=(f-f g )·K ω

[0067] Wherein, f g is the rated frequency of the system, f is the real-time frequency of the power grid, K ω is the frequency-active droop coefficient. In this embodiment, the active power ΔP autonomously increased by the voltage source type wind turbine can be used for the calculation of the feedback torque T b .

[0068] Step S32, the unit main control calculates and issues the given torque T cmd according to the feedback of the converter controller, and compares it with the feedback torque T b of the converter controller. Specifically, the comparison judgment basis of the given torque T cmd and the feedback torque T b is:

[0069] |T cmd -(P-ΔP)·n|≤T dz

[0070] T b =(P-ΔP)·n

[0071] Wherein, T dz is the torque protection threshold, if the deviation of the given torque T cmd and the feedback torque T b is greater than T dz , the torque mismatch protection is triggered. In this embodiment, the unit main control can calculate and issue the given torque T cmd according to the electrical parameters fed back by the converter controller, and compare it with the feedback torque T b ; if the deviation of the given torque T cmd and the feedback torque T b is less than or equal to T dz , the torque mismatch protection is not triggered.

[0072] Step S4, different system simulation scenarios are provided by configuration of software and hardware parameters, and a multi-scenario real-time simulation platform is built; specifically, different voltage levels, different fan capacities, different motor parameters, different main loop parameters and topology integrated simulation models are set according to different simulation requirements, and simulation scenarios are quickly switched through software parameter configuration.

[0073] In the embodiment, system scenario models under different power grid disturbance / fault conditions can also be built to provide more realistic simulation verification scenarios for control strategy design.

[0074] Step S5, a man-machine interaction interface is set to process simulation data.

[0075] Step S51, a man-machine interaction interface software is written, and an Ads communication protocol is connected to a fan controller; in the embodiment, the C# program is written.

[0076] Step S52, a man-machine interaction UI interface is set, and variable states observed by each component of the fan are displayed; that is, visual monitoring can be realized.

[0077] Step S53, a log function of the man-machine interaction interface is set, information of observed variables is added, simulation data is collected and stored and saved as a.csv file, and the simulation data is exported from the system for processing and analysis; the processing and analysis of the simulation data are ensured.

[0078] Step S54, a control instruction interface of the man-machine interaction interface is set, corresponding control instructions are issued to the fan according to the processing and analysis results of the log file, and the running state of the fan is optimized.

[0079] Step S55, a fault monitoring function of the man-machine interaction interface is set; in the embodiment, if the wind turbine generator set fails, the man-machine interaction interface will display the fault code and the fault name, and the fault monitoring is realized.

[0080] The real-time simulation system building method based on the voltage source type wind turbine generator set first establishes a wind turbine generator set aerodynamic-mechanical-electrical integrated simulation model, then configures communication protocols of each part, sets corresponding control strategies according to different actual requirements after the configuration is completed, builds a multi-scenario real-time simulation platform, and sets a man-machine interaction interface; the method more accurately simulates the influence of the power grid running state on each component of the wind turbine generator set.

[0081] In the embodiment, the wind turbine generator set aerodynamic-mechanical-electrical integrated simulation model mainly includes an aerodynamic model, a mechanical model, an electrical model and a hardware control device.

[0082] In the embodiment, a development man-machine interface is arranged to collect and monitor simulation data, to process and control early-stage data, to connect to a fan controller through Ads communication, to realize visual monitoring of power grid state and converter state, and to execute corresponding device control actions.

[0083] The above embodiments are further elaboration and illustration of the present application, so as to be understood, and are not any limitation of the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for building a real-time simulation system based on a voltage source wind turbine generator system, characterized in that: include: S1, establish a wind turbine aerodynamic-mechanical-electrical joint simulation model based on the RTLab simulation platform; S2, configure the data interface, set the protocol converter, and complete the information exchange between the RTLab simulation platform, wind turbine controller and converter controller; S3, according to the actual simulation requirements, set the corresponding voltage source wind turbine coordinated control strategy; The process includes: when the system frequency fluctuates, calculating the additional active power ΔP generated by the voltage source wind turbine, and the converter controller feeding back the actual active power P, the additional active power ΔP and the unit speed n to the unit master control; The unit master controller calculates and issues the given torque T according to the feedback from the converter controller. cmd and the converter controller feedback torque T b For comparison; if the given torque T cmd With feedback torque T b The deviation is less than or equal to T dz , the torque mismatch protection is not triggered; if the given torque T cmd With feedback torque T b The deviation is greater than T dz , then the torque mismatch protection is triggered; the feedback torque T b It is the product of the unit speed n and the difference between the actual active power P and the active power ΔP; S4, through the configuration of software and hardware parameters, provides different system simulation scenarios and builds a multi-scenario real-time simulation platform; S5, set up the human-computer interaction interface and process the simulation data.

2. A method for building a real-time simulation system based on a voltage source type wind turbine according to claim 1, characterized in that: The process of establishing the wind turbine aerodynamic-mechanical-electrical joint simulation model includes the following steps: In the aerodynamic model, the wind speed model is established by the average wind speed and the lateral, longitudinal and vertical turbulence intensities, and a high-order nonlinear model is used to describe the wind rotor model. In S12, the mechanical model is modeled using a dual-mass model, where the inertia of the wind turbine is connected to the inertia of the generator rotor through a shaft system; In S13, the electrical model uses a doubly-fed asynchronous motor model, and the rotor dq axis current is controlled by a converter; an infinite power supply is used to simulate the real power grid; S14, in the hardware control device, signal lines are connected and functions are configured for the fan controller and the converter controller.

3. The method for building a real-time simulation system based on a voltage source type wind turbine according to claim 1, characterized in that: The step S2 comprises the following steps: S21, setting the communication mode between the corresponding devices, wherein the wind turbine controller and the RTLab simulation platform use the Ethernet communication protocol, the wind turbine controller and the converter controller use the Can communication protocol, and the converter controller and the RTLab simulation platform use analog and data IO; S22, modify the interface configuration between communication protocols, select appropriate interface parameters, and develop corresponding protocol converters; S23, configure the variable information to be transmitted. According to the operation and control requirements of the RTLab simulation platform, the wind turbine controller, and the converter controller, respectively configure the signal quantity transmitted between each other.

4. The method for building a real-time simulation system based on a voltage source type wind turbine according to claim 1, characterized in that: The active power ΔP generated independently by the voltage source wind turbine generator system is expressed as: ΔP=(f-f g )·K ω Where, f g is the rated frequency of the system, f is the real-time frequency of the power grid, K ω is the frequency-active power droop coefficient.

5. The method for building a real-time simulation system based on a voltage source wind turbine generator system according to claim 1, characterized in that: The given torque T cmd With feedback torque T b The comparison is based on: |T cmd -(P-ΔP)·n|≤T dz T b =(P-ΔP)·n Where, T dz is the torque protection threshold. If the given torque T cmd With feedback torque T b The deviation is greater than T dz , the torque mismatch protection is triggered.

6. The method for building a real-time simulation system based on a voltage source type wind turbine according to claim 2, characterized in that: The step S4 is specifically as follows: According to different simulation requirements, set up joint simulation integration models with different voltage levels, different wind turbine capacities, different motor parameters, different main circuit parameters and topologies, and realize rapid switching of simulation scenarios through software parameter configuration.

7. The method for building a real-time simulation system based on a voltage source type wind turbine according to claim 1, characterized in that: The step S5 comprises the following steps: S51, write the human-computer interaction interface software, set the ADS communication protocol to connect to the fan controller; S52, setting up a human-computer interaction UI interface to display the variable states that need to be observed for each component of the wind turbine; S53, set up the log function of the human-computer interaction interface, add the variable information that needs to be observed, collect and store the simulation data and save it as a .csv file, and export it from the system for processing and analysis; S54, setting a control command interface of the human-machine interaction interface, combining the log file processing and analysis results, and issuing corresponding control commands to the wind turbine to optimize its operating status; S55, setting the fault monitoring function of the human-computer interaction interface.

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