Wind turbine generator performance evaluation method, system and equipment and storage medium

Abstract

The invention provides a wind turbine generator performance evaluation method, which comprises the following steps of: assembling a simulated wind turbine generator according to a mechanical framework of a tested wind turbine generator, and testing by using the simulated wind turbine generator according to a test requirement to obtain actually measured data; constructing a test model according to the test wind turbine generator and the test requirements, and performing simulation test by using the test model to obtain simulation data; and after consistency check is carried out according to the actually measured data and the simulation data, an error between the simulation data and standard data of the standard wind turbine generator is calculated, and if the error is smaller than a preset value, the tested wind turbine generator is judged to be qualified. The problems that in the prior art, an offshore wind turbine generator set is long in test period, high in cost and large in risk, and the test result cannot comprehensively represent the grid-connected characteristics of the generator set are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power grid-connected stability research, and in particular to a wind turbine performance evaluation method, system, equipment and storage medium. Background Art

[0002] Offshore wind turbines are large-scale, with diverse collection and transmission methods, and complex operating conditions and grid-related characteristics. In order to ensure the reliable operation and friendly grid connection of offshore wind power, it is urgent to build offshore wind power grid connection test and detection capabilities. Offshore field testing has a long cycle, high cost, and high risk. The test results cannot fully characterize the grid-connected characteristics of the unit. In addition, as the penetration rate of wind power in my country increases year by year, the unstable and intermittent characteristics of wind power generation will have an increasingly obvious impact on the safe and stable operation of the power grid. Research on the impact of wind power on the system is inseparable from the effective analysis and evaluation of the operating status of wind turbines and wind farms. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a wind turbine performance evaluation method, which solves the problems in the prior art that offshore wind turbine testing cycles are long, costs are high, risks are high, and test results cannot fully characterize the grid-connected characteristics of the turbine.

[0004] According to an embodiment of the present invention, a method for evaluating performance of a wind turbine generator system includes:

[0005] According to the mechanical structure of the test wind turbine, assemble the simulated wind turbine, and according to the test requirements, use the simulated wind turbine to test and obtain the measured data;

[0006] Construct a test model according to the test wind turbine and test requirements, use the test model to perform simulation tests, and obtain simulation data;

[0007] After consistency check between measured data and simulation data, the error between simulation data and standard data of standard wind turbines is calculated. If the error is less than a preset value, the test wind turbine group is deemed qualified.

[0008] Preferably, the test model includes a mechanical model and an electrical model, and the electrical model includes a power grid model, a signal measurement model, a converter model and a generator model;

[0009] The mechanical model includes a blade model, a hub model, a tower model, a transmission chain model, a cabin model, a main controller model and a wind speed model.

[0010] Preferably, the test requirements include fault voltage ride-through, power quality test and grid adaptability. According to different test requirements, when constructing the test model, only the required models need to be combined.

[0011] Preferably, after obtaining the measured data, the measured data is compared with the national standard to determine whether the tested wind turbine generator set complies with the national standard. If it complies with the national standard, proceed to the next step; if it does not, directly determine that the tested wind turbine generator set is unqualified.

[0012] Preferably, if the consistency check fails, the test model needs to be rebuilt and a simulation test is performed based on the rebuilt test model.

[0013] On the other hand, according to an embodiment of the present invention, a wind turbine performance evaluation system based on virtual testing is also provided. The system uses the above-mentioned wind turbine performance evaluation method, including:

[0014] A modeling module, the modeling module is used to build a corresponding test model according to the architecture of the test wind turbine;

[0015] A test module, wherein the test module is used to perform a test using a test wind turbine group or a test model according to a test requirement to obtain corresponding measured data or simulated data;

[0016] The analysis module is used to calculate the error between the measured data and the simulated data and determine whether the tested wind turbine is qualified according to the error.

[0017] On the other hand, according to an embodiment of the present invention, there is further provided a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the above-mentioned method for evaluating the performance of a wind turbine generator set.

[0018] On the other hand, according to an embodiment of the present invention, a computer storage medium is further provided, characterized in that: a computer program is stored, and when the computer program is executed by a processor, the processor executes the above-mentioned wind turbine performance evaluation method.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] According to the mechanical structure of the test wind turbine, a simulated wind turbine is assembled, and then a virtual test model identical to the simulated wind turbine is constructed. In accordance with the test requirements, the test model is tested, and the obtained simulation data is compared with the standard data of the standard wind turbine. In this way, whether the test wind turbine is qualified is judged based on the error between the two data. As long as the test model is qualified, the corresponding test wind turbine is also qualified. In this way, there is no need to conduct on-site testing of the test wind turbine, thus overcoming the problems of long test cycle, high cost and high risk of wind turbines, making the test results more accurate so as to reflect the grid-connected characteristics of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The figure is a flow chart of the evaluation method according to an embodiment of the present invention.

[0022] Figure 2 This is a flow chart of a fault voltage ride-through test according to an embodiment of the present invention.

[0023] Figure 3 This is a flow chart of power quality testing according to an embodiment of the present invention.

[0024] Figure 4 This is a grid adaptability test diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1 As shown, the embodiment of the present invention proposes a wind turbine performance evaluation method, including:

[0027] According to the mechanical structure of the test wind turbine, assemble the simulated wind turbine, and according to the test requirements, use the simulated wind turbine to test and obtain the measured data;

[0028] The ground platform test is used instead of the field test, and the wind turbine is assembled according to the mechanical structure of the test unit. Its key equipment includes the shaft torque simulation system, the five-degree-of-freedom non-torque loading system, the hydraulic system, the cooling system, the power grid simulation system, the variable frequency drive system, the measurement and control system and the unit under test. The torque loading device and the five-degree-of-freedom non-torque loading device can realize high-precision simulation of wind-wave-current characteristics; the power grid simulation system can cover a variety of grid-connected tests such as power quality and fault voltage ride-through.

[0029] By mapping the field test conditions to the ground test platform, the full working condition simulation of the platform is realized, and the simulated wind turbine is obtained. For typical grid-connected tests such as power quality and fault response, as well as new interactive test requirements such as active inertia support and impedance sweep, the key test parameters are extracted and the measured data are obtained.

[0030] After obtaining the measured data, compare the measured data with the national standard to determine whether the tested wind turbine unit meets the national standard. If it meets the national standard, proceed to the next step. If it does not meet the national standard, directly determine that the tested wind turbine unit is unqualified.

[0031] Construct a test model according to the test wind turbine and test requirements, use the test model to perform simulation tests, and obtain simulation data;

[0032] A grid-connected evaluation simulation test model is built based on a simulated wind turbine. Matlab / Simulink and Bladed are used to build it. The wind turbine model is decoupled into a mechanical model and an electrical model. The electrical model includes the following sub-modules: power grid model, signal measurement model, converter model and generator model, while the mechanical model mainly includes: blade model, hub model, tower model, transmission chain model, nacelle model, main controller model and wind speed model.

[0033] The test requirements include fault voltage ride-through, power quality test and grid adaptability. According to different test requirements, when constructing a test model, it is only necessary to combine the required mechanical model and electrical model.

[0034] After that, simulation tests were started. With reference to typical grid-connected evaluation methods for wind turbines, corresponding virtual simulation models were built according to different grid-connected tests such as fault voltage ride-through, power quality test, and grid adaptability. The test results of the ground test platform and the focus of different test items were analyzed. By studying the impact of replacing parts of wind turbines on the electrical-mechanical characteristics of the grid, a wind turbine grid-connected evaluation method based on ground tests was designed:

[0035] (1) Fault voltage ride-through: Figure 2 As shown, when the wind turbine components and capacity change, it is necessary to provide a document based on theoretical analysis. If the pitch system and main control hardware change or the software is upgraded, the pitch drive test or the main control hardware in-loop simulation test can be used for evaluation. If the capacity, blades and generator change, it is necessary to provide a simulation model that can be used to verify the high and low voltage ride-through characteristics. Based on the impedance voltage division principle, a fault voltage generating device is built and connected in series to the high voltage side of the wind turbine step-up transformer. When the active power of the wind turbine is high power output (P>0.9Pn) and low power output (0.1Pn≤P≤0.3Pn), the wind turbine voltage is tested for its ability to operate continuously without disconnecting from the grid under symmetrical and asymmetrical drops of 0.2pu, 0.35pu, 0.5pu, 0.75pu and 0.9pu, and its ability to operate continuously without disconnecting from the grid under symmetrical and asymmetrical increases of 1.2pu, 1.25pu and 1.3pu.

[0036] (2) Power quality test: As shown in 3, power quality problems caused by wind power grid connection, such as voltage deviation, voltage fluctuation, harmonic voltage and three-phase voltage imbalance, have a serious impact on the safe and stable operation of the power grid. Therefore, the evaluation of wind turbine power quality is crucial. Figure 3As shown in the figure, if the capacity of the wind turbine changes, it is necessary to build a simulation model to verify the power quality performance of the unit and evaluate the active and reactive regulation characteristics of the model; if the generator of the wind turbine changes, it is necessary to simulate and evaluate the harmonics, flicker and active and reactive regulation characteristics of the model; if the main control system of the wind turbine changes, it is necessary to build a simulation model or a hardware-in-the-loop model to simulate and evaluate its flicker characteristics and active and reactive regulation characteristics; and if the pitch system changes, its data files cannot prove that its pitch drive capability meets the operating requirements of the evaluated model, then a pitch system test is required, see Table 1.

[0037] Table 1 Evaluation conditions and methods of wind turbine power quality and active / reactive power regulation capability

[0038]

[0039]

[0040] (3) Grid adaptability: Figure 4 As shown in Figure 1, with the rapid development of renewable energy technology and its industry, the adaptability of wind power systems to real grid environments has become an important factor that must be seriously considered in the further development of modern wind power technology. The grid environment that wind turbines should be able to adapt to mainly includes grid voltage sudden changes, grid voltage imbalance, voltage harmonic distortion, etc. Figure 4 As shown in Figure 2, if the capacity of the wind turbine changes, it is necessary to build a simulation model for verifying the grid adaptability of the unit, and evaluate the three-phase voltage unbalance adaptability and inertia frequency modulation characteristics of its model; if the blades change, it is necessary to evaluate the flicker adaptability and frequency modulation inertia characteristics of the wind turbine; if the generator changes, it is necessary to evaluate the three-phase voltage unbalance adaptability and inertia frequency modulation characteristics of its model; if the main control system changes, it is necessary to build a hardware-in-the-loop model to simulate and evaluate its voltage deviation adaptability, frequency tolerance, flicker adaptability, harmonic voltage adaptability, three-phase unbalance adaptability and inertia frequency modulation characteristics; and if the pitch system changes, it is necessary to provide the adaptability demonstration of the motor and controller to power supply fluctuations and the driving capability test during normal operation, see Table 2.

[0041] Table 2 Wind turbine grid adaptability performance evaluation conditions and methods

[0042]

[0043]

[0044] After consistency check on measured data and simulation data, the error between the simulation data and the standard data of the standard wind turbine set is calculated. If the error is less than a preset range, the test wind turbine set is deemed qualified.

[0045] If the consistency check fails, the test model needs to be rebuilt and a simulation test is performed based on the rebuilt test model.

[0046] After the consistency check is passed, the error calculation begins. For the fault voltage ride-through test, it is necessary to prove that the simulation model has the same grid-connected performance as the ground test model. The voltage, current and power should be within the operating deviation range. The error during transient period should be within 10%, and during steady state period should be within 5%. In addition, it is necessary to have the same active power recovery capability and dynamic reactive power support capability.

[0047] For power quality testing, the error judgment is shown in Table 1, and for grid adaptability, the error judgment is shown in Table 2.

[0048] In summary, the qualification of the tested wind turbine is judged based on the error between the two data. As long as the test model is qualified, the corresponding tested wind turbine is also qualified. Therefore, there is no need to conduct on-site testing on the tested wind turbine, thus overcoming the problems of long testing cycle, high cost and high risk of wind turbines, making the test results more accurate so as to reflect the grid-connected characteristics of the wind turbine.

[0049] On the other hand, an embodiment of the present invention further provides a wind turbine performance evaluation system, which uses the above-mentioned wind turbine performance evaluation method, including:

[0050] A modeling module, the modeling module is used to build a corresponding test model according to the architecture of the test wind turbine;

[0051] A test module, wherein the test module is used to perform a test using a test wind turbine group or a test model according to a test requirement to obtain corresponding measured data or simulated data;

[0052] The analysis module is used to calculate the error between the measured data and the simulated data and determine whether the tested wind turbine is qualified according to the error.

[0053] On the other hand, an embodiment of the present invention further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the above-mentioned method for evaluating the performance of a wind turbine generator set.

[0054] On the other hand, an embodiment of the present invention further provides a computer storage medium, characterized in that: a computer program is stored therein, and when the computer program is executed by a processor, the processor executes the above-mentioned method for evaluating the performance of a wind turbine generator set.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for evaluating the performance of a wind turbine generator set, characterized in that: include: According to the mechanical structure of the test wind turbine, assemble the simulated wind turbine, and according to the test requirements, use the simulated wind turbine to test and obtain the measured data; Construct a test model according to the test wind turbine and test requirements, use the test model to perform simulation tests, and obtain simulation data; After consistency check between measured data and simulation data, the error between simulation data and standard data of standard wind turbines is calculated. If the error is less than a preset value, the test wind turbine group is deemed qualified.

2. A wind turbine performance evaluation method according to claim 1, characterized in that: The test model includes a mechanical model and an electrical model, and the electrical model includes a power grid model, a signal measurement model, a converter model and a generator model; The mechanical model includes a blade model, a hub model, a tower model, a transmission chain model, a cabin model, a main controller model and a wind speed model.

3. A wind turbine performance evaluation method according to claim 1, characterized in that: The test requirements include fault voltage ride-through, power quality test and grid adaptability. According to different test requirements, when constructing the test model, only the required models need to be combined.

4. A wind turbine performance evaluation method according to claim 1, characterized in that: After obtaining the measured data, compare the measured data with the national standard to determine whether the tested wind turbine unit meets the national standard. If it meets the national standard, proceed to the next step. If it does not meet the national standard, directly determine that the tested wind turbine unit is unqualified.

5. A wind turbine performance evaluation method according to claim 1, characterized in that: If the consistency check fails, the test model needs to be rebuilt and a simulation test is performed based on the rebuilt test model.

6. A wind turbine performance evaluation system, characterized in that: The system uses a wind turbine performance evaluation method as claimed in any one of claims 1 to 5, comprising: A modeling module, the modeling module is used to build a corresponding test model according to the architecture of the test wind turbine; A test module, wherein the test module is used to perform a test using a test wind turbine group or a test model according to a test requirement to obtain corresponding measured data or simulated data; The analysis module is used to calculate the error between the measured data and the simulated data and determine whether the tested wind turbine is qualified according to the error.

7. A computer device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes a wind turbine performance evaluation method according to any one of claims 1 to 5.

8. A computer storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor executes a wind turbine performance evaluation method according to any one of claims 1 to 5.

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