WO2011040734A2

WO2011040734A2 - Wind power generation simulation system

Info

Publication number: WO2011040734A2
Application number: PCT/KR2010/006567
Authority: WO
Inventors: 최영도; 박영신
Original assignee: 한국전력공사
Priority date: 2009-09-30
Filing date: 2010-09-28
Publication date: 2011-04-07
Also published as: KR20110035583A; WO2011040734A3; KR101089606B1

Abstract

The present invention relates to a wind power generation simulation system, and more specifically, to a wind power generation simulation system comprising: a simulator which implements a wind power generation system linked with a real power system; and a server which provides a simulated examination condition to the simulator, and detects and analyzes simulated examination results from the simulator.

Description

Wind power simulation system

The present invention relates to a wind power generation simulation system, and more particularly, to a wind power generation simulation system capable of testing mutual impact assessment in connection with a real system.

Most large wind farms are located in mountainous highlands or coastal areas where wind energy is easily obtained due to geographical conditions, and the grid connection point is often at the end of the track, and thus the reliability of voltage management and power quality is degraded when connected to the grid. Therefore, it is necessary to grasp the characteristics of the wind generator connected to the real system through the preliminary impact assessment and the demonstration test.

The problem to be solved by the present invention is to provide a wind power simulation system that can be directly connected to the actual system to secure the impact evaluation analysis technology for the actual system.

According to one aspect of the invention, a wind power generation simulation system is provided.

Wind power generation simulation system according to an embodiment of the present invention includes a simulator for implementing a wind power generation system associated with a real system and a server providing simulation test conditions to the simulator, and detects and analyzes the simulation test results from the simulator. can do.

According to an embodiment of the present disclosure, the simulator may include a mechanical unit that simulates wind conditions and an electrical unit that is connected to the seal system and generates electricity by the wind conditions.

The wind power generation simulation system according to the present invention simulates the same as the actual driving conditions of the actual wind power generation system because the simulation is carried out in real time under arbitrary operating conditions, and the wind generator and It is possible to test the characteristics of the power conversion device and the associated operation characteristics for the grid-connected operation, thereby reducing the cost and time required to construct and test the wind turbine.

1 is a view showing a wind power simulation test system according to an embodiment of the present invention.

2 is a diagram illustrating a control procedure of the power converter.

3 is a diagram illustrating a control mode of the power converter.

4 is a diagram illustrating a server according to an exemplary embodiment.

5 is a diagram illustrating simulation test conditions of a wind power generation simulation system.

6 is a view showing a simulation test environment setting screen of the wind power generation simulation system.

7 is a diagram illustrating a simulation test scenario applied to a wind power generation simulation system.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, an embodiment of the wind power generation simulation system according to the present invention will be described in detail with reference to the accompanying drawings, and in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and duplicated thereto. The description will be omitted.

As shown in FIG. 1, the wind power generation simulation system commands driving conditions to the simulator 100 and the simulator 100 implementing the wind power generation system connected to the real system 300, and simulates the test results from the simulator 100. It includes a server 200 for receiving.

The simulator 100 includes a mechanical unit 110 and an electrical unit 150.

The mechanical unit 110 simulates the wind conditions. The mechanical unit 110 includes a terminal unit 115 that receives a control signal based on a simulated test condition, a virtual blade 120 that implements the characteristics of a blade, which is an actual wind blade, and an inverter unit that receives torque and varies voltage and frequency. 130 and an electric motor 140 driven by an electrical signal.

The electrical unit 150 generates power by the wind condition provided by the mechanical unit 110 and provides power generated in connection with the actual system 300. Electric unit 150 is a power generation method selection unit for selecting the power generation method of the generator 155, the generator 155 to generate electricity in conjunction with the electric motor 140, one of the direct induction type induction power generation method and the double excitation generation method ( 160 and a circuit breaker 190 for connecting the generator 155 and the seal system 300.

The electrical unit 150 is implemented to use both types of generators 155. The electrical unit 150 includes a soft starter 170 connected between the generator 155 and the seal system 300 to implement a direct induction type induction power generation scheme. In addition, the power conversion device 175 is connected between the generator 155 and the actual system 300 to implement a double excitation generation method.

When the electrical unit 150 simulates the generator 155 of the direct induction type induction power generation method, the rotor is short-circuited and the soft starter 170 is used to connect the stator to the system. The soft starter 170 suppresses inrush current when the stator of the generator 155 is connected to the real system 300. The soft starter 170 is stopped when the breaker 190 operates to connect the stator and the seal system 300.

In addition, the electrical unit 150 is configured to control the generator 155 by connecting the rotor to the power converter 175 when simulating the dual excitation induction generator 155. The power converter 175 converts the AC power generated by the generator 155 into AC power suitable for the real system 300. To this end, the power converter 175 has a backtoback structure in which two converters are shared by a DC terminal. The power converter 175 controls the first converter unit 181 connected to the rotor, the second converter unit 182 connected to the actual system, the first converter unit 181, and the second converter unit 182. It includes a converter control unit 185. The first converter unit 181 controls the active power and the reactive power of the generator 155. The second converter unit 182 absorbs or supplies the active power of the rotor converter to the real system and controls a part of the reactive power of the generator 155.

For example, the power converter 175 may control the generator 155 not to increase the amount of power generation even if the wind speed is increased by the simulated test conditions in consideration of the effect on the life of the generator 155 due to the increase in the amount of power generation. .

The electric unit 150 controls the power generation speed of the generator 155 using the power converter 175, and measures the state of the generator 155 associated with the real system 300.

The power converter 175 is associated with the server 200 and receives a run or stop command from the outside. If the rotation speed of the mechanical unit 110 is lower than the set value, the power converter 175 maintains the stopped state even when the execution command is received from the outside.

The simulator 100 may be linked with the real system 300 to obtain actual results of the system analysis.

The real system 300 is actually a power distribution system in which about 22.9 kV of electric power is distributed. The real system 300 is provided with power in connection with the electrical unit 150. The real system 300 may further include a power quality disturbance generating device 310 that arbitrarily changes the power quality of the system. The power quality disturbance generator 310 may analyze the effects on the power distribution system by randomly generating power quality disturbances such as instantaneous voltage drop, instantaneous voltage rise, or harmonics. In addition, the power quality disturbance generating device 310 may affect the power generation conditions of the electrical unit 150 associated with any power quality of the actual system 300.

The server 200 measures the power quality required to analyze the phenomenon of the real system 300 under various input conditions to be simulated, and analyzes the power quality. The server 200 will be described in detail with reference to FIG. 4.

2 is a diagram illustrating a control procedure of the power converter.

As shown in FIG. 2, the power converter 175 is supplied with power in step S10.

In operation S20, the power converter 175 maintains the stopped state.

In step S30, it is determined whether the rotation speed of the wind turbine is higher than a set value set for control start.

As a result of the determination in step S30, when the rotation speed is higher than the set value, in step 40 it is determined to start the control of the power converter 175. If the rotational speed is lower than the set value, the process returns to step S20.

When the highest level control unit of the power conversion device 175 determines the start of control of the power conversion device 175 in step S50, the lower control unit determines that the effective and reactive currents of the generator 155 are divided and controlled.

In step S60, it is determined whether the rotation speed during the control of the power converter 175 is lower than the set value.

If the rotational speed is lower than the set value in step S60, the control of the power converter 175 ends, and if the rotational speed is higher than the set value, the flow returns to step S40.

3 is a diagram illustrating a control mode of the power converter.

As shown in FIG. 3, when the highest-level control unit determines to start the control of the power converter 175 in step S40, the lower-level control unit determines to control the active and reactive currents of the generator 155 by dividing them.

In step S41, the power conversion device 175 is determined to be a mode for controlling the reactive current of the generator 155.

In operation S42, the power converter 175 includes an idle mode that is waiting for power generation without generating a detailed mode of a mode of controlling the active component current of the generator 155.

In operation S43, the power converter 175 includes a synchronization control mode for connecting the generator 155 to the actual system 300 in a detailed mode.

In operation S44, the power converter 175 includes a power generation amount control mode for supplying active power generated in the detailed mode to the real system 300.

In operation S45, the power converter 175 includes a grid separation mode that separates the generator 155 from the actual grid 300 in a detailed mode. The power converter 175 is determined to be a mode for controlling the effective portion current of the generator 155 composed of steps S42, S43, S44, and S45.

4 is a diagram illustrating a server according to an exemplary embodiment.

As shown in FIG. 4, the server 200 includes a main controller 210, a database 240, a data analyzer 230, a power quality measurer 220, a system measurer 250, and an interface display 260. It includes.

The main controller 210 sets simulation test conditions for wind power generation, analyzes power quality by the simulation test conditions, and controls the entire server 200. The main controller 210 provides a user interface for conducting simulation tests and analyzing results. In addition, the main controller 210 controls the simulator 100 and the power quality measuring unit 220 according to the simulation test scenario, and monitors the power quality measuring unit 220. The main controller 210 selects the simulation test scenario and the development method of the simulator 100 to proceed with the simulation test scenario. At this time, the main controller 210 controls the simulator 100 using a communication device to proceed with the simulation test scenario.

The power quality measurement unit 220 measures the power quality of the electrical unit 150 by the simulation test conditions.

The data analyzer 230 receives and analyzes various measurement data generated in the simulation test process from the power quality measuring unit 220, and stores the measurement data and the analysis result in the database 240.

The system measuring unit 250 measures the voltage V, the current I, the active power P, and the reactive power Q of the real system 300.

The interface display unit 260 displays the simulation test data and the analysis result, and displays the control situation of the entire server 200. The interface display unit 260 includes a graph function to enable analysis of the simulation test result waveforms. In addition, the interface display unit 260 supports functions such as zoom-in, zoom-out, tracing, and the like for analysis on a graph, and outputs or prints a result waveform as a graphic file for report generation.

The interface display unit 260 displays an effective value waveform for the entire simulation test time in order to display an effective value graph of the simulated test result. For example, the interface display unit 260 displays items such as active power, reactive power, power factor, frequency, three phase average voltage, three phase average current, each phase voltage, and each phase current in the main graph window. In addition, the interface display unit 260 displays the instantaneous waveform data measured for the events generated during the entire simulation period in the subgraph window. The subgraph window can be created by double-clicking the shaded event section of the main graph window or by using an additional menu of the instantaneous graph. In addition, the interface display unit 260 may display information such as progress of the simulation test, communication status, error message, etc. in a text form in the message window, and may display the operation state of the simulator 100 in the status display window.

The server 200 performs a real-time voltage (V), current (I), active power (P), and invalidity of the real system 300 through the system measurement unit 250 associated with the simulator 100 during the simulation. Measure the power Q. In addition, the server 200 measures the result waveform progressed by the simulation of the simulation scenario and the active power control mode or the reactive power control mode of the simulator 100 through the power quality measurement unit 220. In addition, the server 200 stores the result waveform in the database 240 through the data analyzer 230. The server 200 displays the result waveform stored in the database 240 through the interface display unit 260.

As shown in FIG. 5, the server 200 simulates a scenario to be input to the main controller 210 to analyze the influence on the real system 300 when the simulator 100 is connected to the real system 300. Can be selected.

First, the server 200 selects a power generation method of the generator 155 in the first selector 410. In this case, the power generation method of the generator 155 may be selected from a direct induction type induction power generation method and a double excitation induction power generation method.

In addition, the server 200 selects the wind speed pattern from the second selector 420 to simulate a wind speed pattern similar to the real one. In this case, the wind speed pattern may select one of a constant wind speed and a specific wind speed pattern. For example, a particular wind speed pattern may consist of three wind speed patterns of a particular region for three minutes. In addition, the value of the constant wind speed can be up to about 4m / s to about 22m / s, the value of a particular wind speed has a valid value of about 1 to 3.

The server 200 selects the effective power control mode in the third selector 430 to control the effective power of the generator 155. The active power control mode may be selected from an automatic mode that is optimized for the driving speed of the generator 155 to control the active power and a user mode that allows the user to arbitrarily control the active power.

The server 200 selects the reactive power control mode from the fourth selector 440 to control the invalid power of the generator 155. The reactive power control mode includes a user mode that allows the user to arbitrarily control reactive power, a voltage mode that can operate when the terminal voltage is out of range, a PF mode that can control the power factor in the range of about 0.915 to about +0.832, and One of the automatic modes to automatically control the reactive power operation mode of wind power generation can be selected.

As shown in FIG. 6, the server 200 may set a communication scheme with the simulator 100 to monitor data of the simulator 100 in real time. In this case, the server 200 may set communication methods such as the power converter 175, the electricity meter, and the HMI.

In addition, the server 200 may select monitoring variables of each of the simulator 100 and the real system 300.

As an example, monitoring variables for the simulator 100 include wind speed, rotational speed, blade output, wind generator active power and reactive power, grid-side converter active power and reactive power, stator active power and reactive power, power factor, blade torque, Generator torque, terminal voltage, wind generator output current, stator current, rotor current, and grid-side converter current.

In addition, the monitoring variable for the real system 300 includes an average voltage, total power, total reactive power, A phase voltage, B phase voltage, C phase voltage, etc. of the wattmeter.

Therefore, the server 200 may select among the monitoring variables for the simulator 100 and the real system 300 shown in FIG. 6.

As shown in FIG. 7, the wind speed conditions of the simulation test scenario may be selected from among the variable wind speed, the step wind speed, and the constant wind speed. In addition, the control condition can be selected among automatic control, reactive power manual control, and DATATCOM (reactive power compensation facility) operation. In this case, only the wind speed condition is designated by the central control program, and the control method is automatically controlled by the power converter 175. In the reactive power manual control, the active power is controlled by the power converter 175, and the wind speed condition and the reactive power control condition are input by the central control program.

On the other hand, wind turbines of direct-induced induction generating textiles require the operation of DATATCOM to compensate for reactive power of the generator. However, when observing the power output characteristics of the generator or the system input and shutdown characteristics, the simulation can be carried out with the DATATCOM battery. In addition, the grid voltage can be divided into a normal range and a disturbance state. In the normal range, the SSFG does not operate, and in the disturbance state, the SSFG operates to simulate low voltage / overvoltage, three phase sag, and single phase sag.

In the embodiment of Figure 7, Case 1 to Case 8 shows a simulated test scenario for a generator of the DoubleFed Induction Generator (DFIG) method.

In particular, Case 1 is a test scenario for observing the basic operation of a wind turbine with dual excitation generation under variable wind speed and automatic control conditions.

In addition, Case 2 is a test scenario for analyzing the system influence on the active power fluctuation of the wind turbine generator of dual excitation generation under step wind speed and automatic control. Case 3 is a test scenario for analyzing the system influence on the reactive power fluctuations of a wind turbine with dual excitation generation under constant wind speed and reactive power passive control.

In addition, Case 4 and Case 5 are test scenarios for observing the effects of the dual excitation generation wind turbine generator on the system under low and overvoltage conditions under constant wind speed and reactive power passive control conditions.

On the other hand,

cases

6 and 7 are test scenarios for observing the effect of the dual excitation generation wind turbine generator on the system according to the values of single-phase and three-phase segments under constant wind speed and automatic control conditions.

Finally, Case 8 is a test scenario for observing the effects of grid dropout on a wind turbine with dual excitation generation at constant wind speed, automatic control, and generator dropout conditions.

On the other hand, in the embodiment of Figure 7, Cases 9 to 15 show a simulation test scenario for the generator of the direct induction type generator.

In particular, Case 9 is a test scenario for observing the basic operation of a wind turbine with direct start induction under variable wind conditions.

In addition, Case 10 is a test scenario for analyzing the system influence on the active power fluctuation of the direct-driven induction wind turbine generator under step wind speed conditions. Example 11 is a test scenario for the analysis of the system influence on the reactive power fluctuations of the direct induction wind turbine generator under constant wind speed and DATATCOM operating conditions.

In addition,

cases

12 and 15 are test scenarios for observing the effects of the direct-induced induction wind turbine generator on the system under low and overvoltage conditions at constant wind speed and DATATCOM operating conditions.

Case 13, on the other hand, is a test scenario for observing the effects on the grid when the direct-driven induction wind turbine is connected to the grid at constant wind speed and generator input conditions.

Finally, case 14 is a test scenario for observing the effect of grid dropout on a wind turbine with direct induction wind turbines at constant wind speed and generator dropout conditions.

The wind power generation simulation system according to the present invention simulates the same as the actual driving conditions of the actual wind power generation system because the simulation is conducted in real time under arbitrary operating conditions, and by using a simulator connected to the actual system of 22.9 kV. You can test the characteristics of wind generators and power converters, or the characteristics of the linking operation for grid-linked operation, which can reduce the cost and time required to build and test wind turbines.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

A simulator for implementing a wind power generation system linked to a real system; And

And a server providing simulation test conditions to the simulator and detecting and analyzing simulation test results from the simulator.
The method according to claim 1,

The simulator,

A mechanical unit for simulating wind conditions; And

Wind power generation simulation system, characterized in that it is connected to the real system, and comprises an electric unit for generating power by the wind conditions.
The method according to claim 2,

The mechanical part,

A control signal receiver for receiving a control signal according to a simulated test condition;

Virtual blade to simulate the characteristics of the actual blade;

An inverter unit for varying a voltage and a frequency by a torque input; And

Wind power generation simulation system comprising a motor driven by using the voltage received from the inverter unit.
The method according to claim 2,

The electrical unit,

A generator generating power according to the wind condition;

A power generation method selection unit for selecting a power generation method of the generator; And

Wind generator simulation system comprising a breaker for connecting the generator and the seal system.
The method according to claim 4,

The electrical unit,

A soft starter connected in parallel between the generator and the real system to implement the generator by a direct induction type induction power generation system; And

The wind power generation simulation system further comprises a power converter connected in parallel between the generator and the real system to implement the generator in a dual excitation induction method.
The method according to claim 5,

The power converter,

A first converter connected to the generator;

A second converter connected to the real system; And

And a converter control unit for controlling the first converter unit and the second converter unit.
The method according to claim 6,

The power converter,

Wind power generation simulation system, characterized in that for operating in the invalid portion control mode for controlling the active portion current of the generator and the effective portion control mode for controlling the active portion current of the generator.
The method according to claim 7,

The effective portion control mode,

An idle mode in which the generator is waiting;

A synchronization control mode for connecting the generator to the real system;

A generation amount control mode for supplying active power generated by the generator to the real system; And

A wind power generation simulation system comprising a grid separation mode for separating the generator from the real grid.
The method according to claim 1,

The server,

A main control unit for setting the simulation test conditions and providing a user interface for conducting simulation tests and analyzing results;

A power quality measuring unit for measuring power quality of the electric unit by the simulation test condition;

A data analyzer which receives and analyzes measurement data from the power quality measurement unit;

A database for storing the measurement data and analysis results; And

A wind power generation simulation system comprising a system measuring unit for measuring the voltage, current, active power and reactive power of the real system during the simulation test in connection with the simulator.
The method according to claim 9,

The main control unit,

A simulation simulation system for generating a simulation test scenario by setting a simulation test condition for at least one of a wind speed condition, a control condition, and a grid voltage condition.
The method according to claim 10

The wind speed condition is any one of a variable wind speed, a step wind speed, and a constant wind speed is selected,

In the control condition, one of the automatic control and the reactive power manual control is selected in the dual excitation generation method, and the operation of the reactive power compensation facility (DSTATCOM) is selected in the direct start type induction generation method.

The grid voltage condition is a wind power generation simulation system, characterized in that any one of a steady state and disturbance occurrence state is selected.
The method according to claim 9,

The server,

The wind power generation simulation system further comprises an interface display unit for displaying the user interface.
The method according to claim 1,

The wind power generation simulation system, characterized in that further comprising a power quality disturbance generator for randomly changing the power quality of the system in the real system.