DL/T 1235-2019Guide for measurement and modeling of synchronous generator prime mover and its regulating system parameters (English PDF)

Foreword

This standard starts from the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1: Standard Structure and Compilation" grass.

This standard is an amendment to DL/T 1235-2013 "Guidelines for Measurement and Modeling of Synchronous Generator Prime Mover and Its Regulation System Parameters" Order.

Compared with the previous edition, the main technical changes of this standard are as follows except for editorial changes.

- Added reference standards. GB/T 9652.1 and GB/T 11805 (see 2);

--Added "The model parameters of the prime mover of the hydroturbine unit should directly perform the actuator command step in the opening mode" (see 4.1.7);

--- Added "The gas turbine unit test should be carried out in the speed closed loop mode" (see 4.1.8);

--Added "For steam turbine units of gas-steam combined cycle generating units, if the regulating system is in normal operation, If the door is fully open, no modeling test is required". (see 4.1.9);

--Added the relevant requirements of "the results of the prime mover and its regulation system modeling should be reviewed and stored" (see 4.10);

--Added "The refresh frequency of the output analog of the hydraulic turbine regulation system should be greater than 50Hz, and the electrical power should be PT, CT the measured signal is calculated. "Related requirements (see 5.2);

- Deleted the buffer link model in the turbine control system;

--Added the model of the main output limiting link (see 9.2.4), and modified the model of the turbine control system (see Figure A.9);

--- Increase the large and small step test requirements for the static test of the steam turbine actuator, "should be carried out above 20% of the valve opening" (See 11.1.1);

--- Added Appendix C, the signals that need to be collected, listing typical steam turbine, water turbine and gas the most basic signal required for measurement modeling.

This standard was proposed by the China Electricity Council.

This standard is under the jurisdiction of the National Grid Operation and Control Standardization Technical Committee (SAC/TC446).

Drafting organizations of this standard. State Grid Corporation of China National Electric Power Dispatching Control Center, China Electric Power Research Institute Co., Ltd., South China Fang Power Grid Research Institute Co., Ltd., China Southern Power Grid Power Dispatching Control Center, North China Electric Power Research Institute Co., Ltd.

Ren company, State Grid Shaanxi Electric Power Research Institute, Yunnan Electric Power Research Institute (Group) Co., Ltd., State Grid Fujian Provincial Electric Power Co., Ltd. Electric Power Research Institute, State Grid Zhejiang Electric Power Research Institute, Huadian Electric Power Research Institute Power Research Institute Co., Ltd., Rundian Energy Science and Technology Co., Ltd., State Grid Hubei Electric Power Co., Ltd. Electric Power Research Institute, State Grid Hai Municipal Electric Power Company Electric Power Research Institute, State Grid Ningxia Electric Power Co., Ltd. Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd.

Electric Power Research Institute, State Grid Shanxi Electric Power Research Institute, State Grid Henan Electric Power Research Institute, Datang Hydropower Research Institute Co., Ltd.

1 Scope

This standard specifies the prime mover and its regulating system model and parameter implementation of the synchronous generator set for power system stability analysis and calculation.

Measurement and modeling methods.

This standard is applicable to the prime mover, energy supply system and energy supply system of steam turbine generator sets, hydraulic turbine generator sets and gas generator sets.

Adjust the actual measurement and modeling of system parameters, and put forward requirements for relevant departments involved in parameter measurement and modeling. Other types of power generation the unit can be implemented by reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is suitable Used in this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 9652.1 Technical conditions of hydraulic turbine control system GB/T 11805 Automatic components (devices) of hydraulic turbine generator sets and basic technical conditions of their systems GB/T 14100 Gas Turbine Acceptance Test DL/T 496 Hydro-turbine electro-hydraulic control system and device adjustment test guide DL/T 824 Guidelines for Performance Acceptance of Steam Turbine Electro-hydraulic Control System

3 Terms and definitions

The following terms and definitions apply to this standard.

Governing system

A control system that controls the operation of the prime mover.

Actuator

Accept the instructions of the prime mover adjustment system to control the electric-hydraulic system or mechanical-hydraulic system of valves, guide vanes (paddles), etc.

压系统。 Pressure system.

Prime mover and energy supply system prime mover and energy supply system Steam turbines and their boilers, water turbines and their water diversion systems, compressors and gas turbines that provide mechanical torque for generators Set.

Static test

A test conducted on a generator set in a shutdown state.

Load test

A test conducted on a generator set under grid-connected conditions.

Step test

A step change test of the set value of the controlled quantity.

Step value

In the step test, the difference between the final steady-state value of the controlled quantity and the initial value is shown in Figure 1 as 1 0U U-.

PM overshoot

In the step test, the percentage of the ratio of the difference between the maximum value of the controlled quantity and the final steady-state value to the step quantity, as shown in Figure 1.

3.10

Dt delay time

In the step test, the time required from the time the step signal is added to when the controlled quantity changes to 10% of the step quantity is shown in Figure 1.

3.11

Upt rise time

In the step test, the time required from the addition of the step amount to the time the controlled amount changes to 90% of the step amount is shown in Figure 1.

3.12

Pt peak time

In the step test, the time from the time the step quantity is added to the controlled quantity reaches the maximum value is shown in Figure 1.

3.13

St settling time

The shortest time from the start time to the absolute value of the difference between the controlled quantity and the final steady-state value does not exceed 5% of the step quantity, as shown in Figure 1.

3.14

N number of oscillation the number of oscillations of the controlled quantity during the adjustment time (Figure 1).

3.15

Frequency-domain measuring Add sine signals or noise signals of different frequencies to the input end, measure the frequency response characteristics of the output end to the input end, and take A method to identify the model and its parameters using direct comparison of amplitude-frequency and phase-frequency characteristics or curve fitting techniques.

3.16

Time-domain measuring Add a disturbance signal at the input, generally a step signal, measure the time domain response characteristics of the output, and analyze the structure of the link the method to identify the model and its parameters by comparing the simulated time-domain response characteristic curve with the measured results.

3.17

RPP hydro turbine reverse peak power in the step test of the turbine, the difference between the initial power and the maximum reverse power is shown in Figure 2.

3.18

RPT hydro turbine reverse peak time in the hydraulic turbine frequency step test, the time required from the step amount to when the reverse power reaches the maximum value is shown in Figure 2.

3.19

HPP maximum power increment of steam turbine high pressure cylinder in the steam turbine step test, the maximum value reached during the rapid power change minus the initial power value is shown in Figure 3.

3.20

HPT steam turbine high pressure cylinder peak time in the steam turbine step test, the time required from the step amount to when the power reaches the maximum output increment of the high pressure cylinder, as shown in Figure 3.

Shown.

3.21

Valve control mode

Specify the steam turbine control mode of the valve opening.

3.22

Guide-valve control mode the turbine control mode that feeds back the guide vane opening per unit value.

3.23

Power control mode

The turbine control mode with feedback power per unit value.

Figure 1 Example curve of step response characteristic

Figure 2 Example curve of step response of hydraulic turbine

Figure 3 Example curve of step response of steam turbine

4 Technical principles

4.1 The basic requirements for the actual measurement of the prime mover and its regulation system parameters.

4.1.1 The control system, the actuator and the prime mover should be modeled, tested and identified separately.

4.1.2 The closed-loop control mode of the prime mover and its regulating system (such as. steam turbine load closed-loop, coordinated control, hydraulic turbine Group power closed-loop, monitoring closed-loop, etc.) test, as the basis for evaluating the correctness of the prime mover and its regulation system model parameters.

4.1.3 Regardless of the discreteness in the modeled object, consider its discrete control system as a continuous control system.

4.1.4 The actual measurement modeling of the regulating system and actuator should be carried out in the static test.

4.1.5 The actual measurement and modeling of the prime mover shall be carried out in the load test. The test conditions shall include typical work conditions of 80% rated load and above.

condition.

4.1.6 The actual measurement of the model parameters of the prime mover of the steam turbine unit should be carried out in the valve control mode.

4.1.7 The model parameters of the prime mover of the hydraulic turbine unit should be in the opening mode, and the actuator command step should be directly performed.

4.1.8 The test of the gas turbine unit should be carried out in the speed closed loop mode.

4.1.9 For the steam turbine unit of a gas-steam combined cycle generator set, if its regulating system keeps the regulating valve fully open during normal operation, no modeling experiment is required.

4.1.10 The identification results of the model parameters of the regulating system, the actuator, the prime mover, etc. shall be verified separately, and the simulation results shall be compared with the actual the error of the test result should meet the requirements of Chapter 11 of this standard.

4.1.11 Frequency domain measurement method or time domain measurement method can be adopted according to the actual situation.

4.1.12 Under conditions, the actual grid frequency disturbance curve can be used as input, and the primary frequency modulation response characteristics of the unit can be used as input.

Verify the accuracy of model parameters.

4.1.13 The errors caused by measuring equipment and measuring methods shall be fully taken into account when modeling, and necessary corrections shall be made.

4.2 The prime mover and its adjustment system components should meet the requirements of national standards and industry standards; the static test should be completed after the adjustment system acceptance (Meet the requirements of GB/T 9652.1, GB/T 11805, GB/T 14100, DL/T 496, DL/T 824, respectively);

The test should be carried out after a frequency modulation test is qualified.

4.3 The various coefficients of the prime mover and its regulating system model are expressed in units of per unit value, and the unit of time constant is second.

4.4 Modification, overhaul, software upgrade, parameter modification, etc. of the modeled prime mover and its adjustment system components should be retested.

4.5 The test equipment meets the measurement requirements, and the measured waveforms should be able to meet the requirements of later analysis and processing.

4.6 The measured model parameters of the prime mover and its regulation system should be calculated through the power system special calculation program (such as PSD-BPA, PSASP Other procedures) verification, the error between the simulation results and the measured results should meet the requirements of Chapter 11 of this standard.

4.7 When a model that meets the requirements cannot be selected in the special calculation program for the power system (see Appendix A), calculate on request Program providers add new models, or use program user-defined functions to create new models.

4.8 The modeling report shall provide the selection results and model parameters of the prime mover and its regulation system model for power system stability calculation.

And provide the comparison result of the simulation curve and the measured curve, give the error index, the error standard should meet the requirements of Chapter 11 of this standard.

4.9 The completion of the actual test of the prime mover and its regulation system exceeds five years. A recheck test shall be carried out. The test items shall be Load test specified in Chapter 11: And compare the measured results with the simulation results. When the simulation error meets the requirements, there is no need Re-modeling; if the requirements are not met, the modeling work shall be restarted until the simulation error meets the requirements of Chapter 11 of this standard.

4.10 The modeling results of the prime mover and its regulation system should be reviewed and checked in.

4.10.1 The audit content includes. test items, test data, identification process, and simulation results.

4.10.2 Incoming check includes. non-disturbance simulation check and frequency disturbance simulation check.

4.10.3 Non-disturbance simulation check method. replace the tested unit speed control model with actual measured model parameters in the actual data of the power grid, Perform non-disturbance simulation, and the maximum fluctuation of the calculated power angle curve of the unit does not exceed 0.6 ± .

4.10.4 Frequency disturbance simulation check method. based on the basic data of no disturbance simulation check, the frequency disturbance in the modeling report the test is simulated, and the error between the simulation result and the actual measurement result of the unit power should meet the relevant requirements of Chapter 11 of this standard.

4.10.5 After completing the audit work and warehousing check, the modeling results of the prime mover and its regulation system are ready to enter the power grid simulation calculation the conditions of the parameter library.

5 Requirements for suppliers of prime movers and their regulating systems

5.1 The adjustment system should meet the requirements of GB/T 9652.1, GB/T 11805, GB/T 14100, DL/T 496, DL/T 824, the mathematical model parameters and technical data of the adjustment system and each additional link shall be provided, and the procedures involved in the calculation and test measurement shall be marked Non-linear and logical control links such as pure delay.

5.2 The adjustment system should have the interface required by the third party for model parameter testing, and can input analog signals for testing.

Test, the refresh frequency of the analog output of the steam turbine regulation system should be greater than 10Hz; the refresh frequency of the analog output of the hydraulic turbine regulation system the rate should be greater than 50Hz, and the electrical power should be calculated using PT and CT measurement signals.

5.3 The setting value of the adjustment system should be expressed in decimal, the time constant is expressed in seconds, and the magnification is expressed in per unit value.

The method of determining the standard value of the unit value.

6 Information and data that power generation companies should provide

6.1 The tested party shall provide the manufacturer, model, control method and control logic of the prime mover and its regulating system.

Instruction cycle.

6.2 Thermal calculations for thermal power plants, adjustment and maintenance calculations for hydraulic turbine units, adjustment system debugging, acceptance or optimization test reports, Load test report.

6.3 Control parameters of the actuator (see Appendix B).

6.4 Parameters of steam turbine/water turbine/gas turbine (see Appendix B).

6.5 The manufacturer, model, rated capacity and design parameters of the boiler.

6.6 The main logic of the coordinated control (CCS) of thermal power plants and the closed-loop control logic of monitoring power of hydropower plants.

7 Basic methods of model parameter measurement and identification

7.1 According to the transfer function block diagram of the field device, the model of each part can be determined, and its parameters can be measured on this basis. According to the model According to the specific situation of the model, the input/output characteristics of each link are graded and tested, and the unknown is obtained according to the measurement results and the predetermined model parameter.

8 Regulation system model