Turbine generator system electronic mockup construction method

Abstract

The application discloses a method for building an electronic sample mechanism of a turbine power generation system, and belongs to the field of electric machines. Step one: a turbine output power and turbine loss data table and a data table of losses and a direct current side voltage of a generator under different rotating speeds and direct current side currents are prepared; step two: a working condition of the turbine power generation system is given; step three: a speed median value is taken as a pre-given rotating speed a; step four: a direct current side current median value is taken as a pre-given direct current side current b; step five: a direct current side voltage c is obtained by interpolation with a and b as base values, and a direct current side current d of the generator is calculated; step six: d-b is calculated, and an absolute value is taken, and whether the difference value is smaller than delta 1 is judged; step seven: a total loss e of the turbine power generation system is obtained by summing up the electric machine loss and the turbine loss, a total output power f of the generator is calculated, and a turbine output power g is obtained by interpolation; step eight: g-e-f is calculated, an absolute value is taken, and whether the difference value is smaller than delta 2 is judged; and step nine: a final result is output. The application is used for building an electronic sample mechanism of a turbine power generation system.

Description

Technical Field

[0001] This invention belongs to the field of electric motors, and specifically relates to a method for constructing an electronic prototype of a turbine power generation system. Background Technology

[0002] In spacecraft systems, turbine-generated power systems are typically used to effectively utilize exhaust gases, thus alleviating pressure on the spacecraft's power modules. This system utilizes the spacecraft's exhaust gases to drive a turbine, which in turn rotates a motor rotor. The motor windings generate voltage, which is then rectified by an uncontrolled rectifier bridge to produce DC voltage for the spacecraft's electrical components. However, the exhaust gases emitted by a spacecraft vary depending on its operating conditions. To better understand the performance of the turbine-generated power system under different conditions, it is necessary to evaluate it. Currently, the main evaluation method involves separate simulation analysis of the turbine and generator components. This method suffers from poor coupling between the power outputs of the turbine and generator, which is one of the main limitations in evaluating the performance of turbine-generated power systems. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that the power of the preceding and following stages cannot be well coupled in the existing performance evaluation calculation methods for turbine power generation systems, and to propose a method for constructing an electronic prototype of a turbine power generation system.

[0004] The method of the present invention uses finite element calculation to calculate data of turbine and motor under different operating conditions, and then calculates the performance of turbine power generation system under a given operating condition through iterative interpolation.

[0005] The present invention achieves the above objectives by adopting the following technical solution:

[0006] A method for constructing an electronic prototype of a turbine power generation system, the method comprising the following steps:

[0007] Step 1: Create a data table of turbine output power and turbine loss, as well as a data table of generator loss and DC-side voltage at different speeds and DC-side currents;

[0008] Step 2: Given the operating conditions of the turbine generator system to be calculated, including the inlet and outlet pressures on the turbine side and the DC load resistance of the generator;

[0009] Step 3: Take the median value of the rotational speed from the generator data table as the preset rotational speed 'a';

[0010] Step 4: Take the median value of the DC side current in the generator data table as the pre-given DC side current b;

[0011] Step 5: Using the pre-given speed a and the pre-given DC side current b as base values, obtain the corresponding DC side voltage c in the generator DC side voltage data table through spline interpolation. Then, calculate the generator DC side current d using I = U / R; R is the generator DC side load resistance.

[0012] Step Six: Calculate the difference between the calculated generator DC-side current d and the pre-given DC-side current b, and take the absolute value. Determine if the difference is less than δ1, where δ1 is the convergence error, a positive number approaching zero. If the difference is greater than the convergence error δ1, update the pre-given DC-side current b and repeat Steps Five and Six. If the difference is less than the convergence error δ1, continue to Step Seven.

[0013] Step 7: Using the pre-given speed 'a' and the pre-given DC-side current 'b' as base values, obtain the corresponding motor losses in the generator loss data table using spline interpolation; using the pre-given speed 'a', the turbine inlet pressure, and the turbine outlet pressure as base values, obtain the corresponding turbine losses in the turbine loss data table using spline interpolation; sum the motor losses and turbine losses to obtain the total loss e of the turbine power generation system; calculate the total power on the DC load side, i.e., the total output power f of the generator, using P=UI; using the pre-given speed 'a', the turbine inlet pressure, and the turbine outlet pressure as base values, obtain the corresponding turbine output power g in the turbine output power data table using spline interpolation.

[0014] Step 8: Subtract the total losses e of the turbine generator system and the total output power f of the generator from the turbine output power g calculated above, and determine whether the absolute value of the difference is less than δ2, where δ2 is the convergence error, which is a positive number close to zero; if the difference is greater than the convergence error δ2, update the pre-given speed a and repeat steps four to eight; if the difference is less than the convergence error δ2, continue to step nine.

[0015] Step 9: Output the final results, including generator speed a, DC side voltage c, DC side current d, total losses of the turbine generator system e, turbine output power g, and generator output power f.

[0016] Furthermore, step one specifically involves: calculating the total output power and turbine loss of the turbine under different inlet pressures, outlet pressures, and turbine speeds using the finite element method; creating a data table of turbine output power and turbine loss for different inlet pressures, outlet pressures, and turbine speeds using the calculated results; and then using spline curve interpolation to obtain the corresponding turbine output power and turbine loss values ​​for any inlet pressure, outlet pressure, and turbine speed within the range of the data table.

[0017] The generator loss and DC-side voltage under different speeds and load resistances are calculated using the finite element method. The calculated results are then used to create data tables of generator loss and DC-side voltage under different speeds and DC-side currents. Spline curve interpolation is then performed on these data tables to obtain the corresponding generator loss and DC-side voltage at any speed and DC-side current within the range of the data tables.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Only a small amount of limited metadata is needed to construct the database required for turbine power generation system performance calculations, and the simulations of the two parts are performed independently, which can reduce the time required to evaluate the optimization of a component during the design phase using this method.

[0020] 2. Based on pre-calculated data samples, this method can quickly obtain the performance under different working conditions through interpolation and iterative processing (the loop formed by the convergence errors in steps six and eight embodies the iterative processing); it saves more time than simply using the finite element method.

[0021] 3. This method iteratively solves for the generator's own power and then iteratively solves for the turbine power, forming an overall power conservation (the specific implementation process is steps one through nine). Compared with the traditional method of analyzing the turbine and generator performance indicators separately, this method has a stronger physical connection and can better satisfy the physical conditions for power coupling. This method calculates the overall performance of the turbine-generator system based on the given turbine-side inlet and outlet pressures and the generator's DC-side load resistance. First, a pre-given speed is used to iteratively calculate the DC-side current that satisfies the convergence error.

[0022] Based on this, the total loss and output power of the corresponding motor and turbine are calculated. The system power error is used as the convergence error condition. If the convergence error is not met, the pre-given speed is changed and the motor iteration is recalculated until the system power error convergence is met, thus forming the overall power conservation. Attached Figure Description

[0023] Figure 1 This is a flowchart of the electronic prototype construction method for the turbine power generation system of the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Specific implementation method one: as follows Figure 1 As shown, this embodiment discloses a method for constructing an electronic prototype of a turbine power generation system, the method comprising the following steps:

[0026] Step 1: Create a data table of turbine output power and turbine loss, as well as a data table of generator loss and DC-side voltage at different speeds and DC-side currents (i.e., create a data table of generator loss and DC-side voltage at different speeds and DC-side currents).

[0027] Step 2: Given the operating conditions of the turbine generator system to be calculated, including the inlet and outlet pressures on the turbine side and the DC load resistance of the generator;

[0028] Step 3: Take the median value of the speed in the generator data table (the generator loss data table under different speeds and DC side currents and the generator DC side voltage data table under different speeds and DC side currents. The speed and DC side current in these two data tables are consistent, so you can choose either one) as the pre-given speed a.

[0029] Step 4: Take the median value of the DC side current in the generator data table (explained as above) as the pre-given DC side current b;

[0030] Step 5: Using the pre-given speed a and pre-given DC side current b as base values, obtain the corresponding DC side voltage c in the generator DC side voltage data table through spline interpolation. Then, calculate the generator DC side current d using I = U / R; R is the generator DC side load resistance (which is pre-given).

[0031] Step Six: Calculate the difference between the calculated generator DC-side current d and the pre-defined DC-side current b, and take the absolute value. Determine if the difference is less than δ1, where δ1 is the convergence error (a manually set convergence error range, generally within 3%), which is a positive number close to zero. If the difference is greater than the convergence error δ1, update the pre-defined DC-side current b and repeat Steps Five and Six. If the difference is less than the convergence error δ1, continue to Step Seven.

[0032] Step 7: Using the pre-given speed 'a' and the pre-given DC-side current 'b' as base values, obtain the corresponding motor losses in the generator loss data table using spline interpolation; using the pre-given speed 'a', the turbine inlet pressure, and the turbine outlet pressure as base values, obtain the corresponding turbine losses in the turbine loss data table using spline interpolation; sum the motor losses and turbine losses to obtain the total loss e of the turbine power generation system; calculate the total power on the DC load side, i.e., the total output power f of the generator, using P=UI; using the pre-given speed 'a', the turbine inlet pressure, and the turbine outlet pressure as base values, obtain the corresponding turbine output power g in the turbine output power data table using spline interpolation.

[0033] Step 8: Subtract the total losses e of the turbine generator system and the total output power f of the generator from the turbine output power g calculated above, and determine whether the absolute value of the difference is less than δ2, where δ2 is the convergence error (a convergence error range set manually, generally within 3%), which is a positive number close to zero; if the difference is greater than the convergence error δ2, update the pre-given speed a and repeat steps four to eight; if the difference is less than the convergence error δ2, continue to step nine.

[0034] Step 9: Output the final results, including generator speed a, DC side voltage c, DC side current d, total losses of the turbine generator system e, turbine output power g, and generator output power f.

[0035] Furthermore, step one specifically involves: calculating the total output power and turbine loss of the turbine under different inlet pressures, outlet pressures, and turbine speeds using the finite element method; creating a data table of turbine output power and turbine loss for different inlet pressures, outlet pressures, and turbine speeds using the calculated results; and then using spline curve interpolation to obtain the corresponding turbine output power and turbine loss values ​​for any inlet pressure, outlet pressure, and turbine speed within the range of the data table.

[0036] The generator loss and DC-side voltage under different speeds and load resistances are calculated using the finite element method. The calculated results are then used to create data tables of generator loss and DC-side voltage under different speeds and DC-side currents. Spline curve interpolation is then performed on these data tables to obtain the corresponding generator loss and DC-side voltage at any speed and DC-side current within the range of the data tables.

[0037] The present invention establishes an example model according to the proposed method. Given the total inlet pressure, total outlet pressure and DC side load resistance of the generator, the calculated generator speed, DC side voltage, DC side current, total loss of the turbine power generation system, turbine output power and generator output power are shown in Table 1.

[0038] Table 1 Example Calculation Table

[0039]

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for constructing an electronic prototype of a turbine power generation system, characterized in that: The method includes the following steps: Step 1: Create a data table of turbine output power and turbine loss, as well as a data table of generator loss and DC-side voltage at different speeds and DC-side currents; Step 2: Given the operating conditions of the turbine generator system to be calculated, including the inlet and outlet pressures on the turbine side and the DC load resistance of the generator; Step 3: Take the median value of the rotational speed from the generator data table as the preset rotational speed 'a'; Step 4: Take the median value of the DC side current in the generator data table as the pre-given DC side current b; Step 5: Using the pre-given speed a and the pre-given DC side current b as base values, obtain the corresponding DC side voltage c in the generator DC side voltage data table through spline interpolation. Then, calculate the generator DC side current d using I = U / R; R is the generator DC side load resistance. Step Six: Calculate the difference between the calculated generator DC-side current d and the pre-given DC-side current b, and take the absolute value. Determine if the difference is less than δ1, where δ1 is the convergence error, a positive number approaching zero. If the difference is greater than the convergence error δ1, update the pre-given DC-side current b and repeat Steps Five and Six. If the difference is less than the convergence error δ1, continue to Step Seven. Step 7: Using the pre-given speed 'a' and the pre-given DC-side current 'b' as base values, obtain the corresponding motor losses in the generator loss data table using spline interpolation; using the pre-given speed 'a', the turbine inlet pressure, and the turbine outlet pressure as base values, obtain the corresponding turbine losses in the turbine loss data table using spline interpolation; sum the motor losses and turbine losses to obtain the total loss e of the turbine power generation system; calculate the total power on the DC load side, i.e., the total output power f of the generator, using P=UI; using the pre-given speed 'a', the turbine inlet pressure, and the turbine outlet pressure as base values, obtain the corresponding turbine output power g in the turbine output power data table using spline interpolation. Step 8: Subtract the total losses e of the turbine generator system and the total output power f of the generator from the turbine output power g calculated above, and determine whether the absolute value of the difference is less than δ2, where δ2 is the convergence error, which is a positive number close to zero; if the difference is greater than the convergence error δ2, update the pre-given speed a and repeat steps four to eight; if the difference is less than the convergence error δ2, continue to step nine. Step 9: Output the final results, including generator speed a, DC side voltage c, DC side current d, total losses of the turbine generator system e, turbine output power g, and generator output power f.

2. The method for constructing an electronic prototype of a turbine power generation system according to claim 1, characterized in that: Step one specifically involves: calculating the total output power and turbine loss of the turbine under different inlet pressures, outlet pressures, and turbine speeds using the finite element method; creating a data table of turbine output power and turbine loss for different inlet pressures, outlet pressures, and turbine speeds using the calculated results; and then using spline curve interpolation to obtain the corresponding turbine output power and turbine loss values ​​for any inlet pressure, outlet pressure, and turbine speed within the range of the data table. The generator loss and DC-side voltage under different speeds and load resistances are calculated using the finite element method. The calculated results are then used to create data tables of generator loss and DC-side voltage under different speeds and DC-side currents. Spline curve interpolation is then performed on these data tables to obtain the corresponding generator loss and DC-side voltage at any speed and DC-side current within the range of the data tables.

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