CN112505544B - Black-start self-excitation checking device and method - Google Patents
Black-start self-excitation checking device and method Download PDFInfo
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- CN112505544B CN112505544B CN202011316588.3A CN202011316588A CN112505544B CN 112505544 B CN112505544 B CN 112505544B CN 202011316588 A CN202011316588 A CN 202011316588A CN 112505544 B CN112505544 B CN 112505544B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/02—Details of the control
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Abstract
The invention relates to a black start self-excitation checking device, which comprises a power supply module, an embedded processor module and a serial port touch display control screen, wherein the power supply module is connected with the embedded processor module; the device inputs parameters of black start electric equipment through a serial port touch display control screen, and transmits the parameters to an embedded processor module, the embedded processor module checks the angle of the self-excitation angle comprehensively from a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm to judge, when all conditions are not satisfied with the self-excitation, the information which cannot be self-excited is displayed through the serial port touch display control screen, when any angle indicates that the self-excitation can be generated, the information which can be self-excited is also displayed through the serial port touch display control screen, a data basis is provided for black start field staff, and the black start is ensured to be performed under safe, controllable and reliable conditions.
Description
Technical Field
The invention belongs to the technical field of black start, and particularly relates to a black start self-excitation checking device and method.
Background
When the hydroelectric or gas engine is started in black, the main potential safety hazard exists in self-excitation, the principle of self-excitation is that the circuit, especially the long circuit, is equal to the sum of the capacitance reactance of the ground and the generator and the transformer, namely the capacitance reactance is equal to the impedance, at the moment, the oscillation phenomenon can occur, even if the generator is not excited, the voltage at the end of the generator is spontaneously and gradually increased by residual voltage, the electric equipment can be damaged when the magnetic circuit is not saturated, and the accident of equipment damage caused by excessive self-excitation once occurs, therefore, under the condition that the sending circuit is longer, the self-excitation condition needs to be checked in detail so as to prevent the possible self-excitation phenomenon, the black start is performed under the condition of safety and controllability, if the checking result indicates that the self-excitation possibly occurs, the wiring mode of a black start path needs to be changed, or a unit is reselected, the self-excitation check is performed again until the result shows that the self-excitation does not occur, and the black start with the circuit can be started. The current common black start self-excitation checking means is single, the self-excitation checking is not carried out from multiple angles, the single checking result possibly has defects, the conclusion whether the self-excitation occurs or not cannot be accurately given, meanwhile, the current self-excitation checking is usually carried out in advance by staff, the selected parameters and the actually measured parameters come in and go out, the checking is carried out again on site, the black start progress and the plan of the wholesale are influenced, and a device capable of carrying out the self-excitation checking on site is urgently needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the black start self-excitation checking device and method, which can realize black start self-excitation field checking, check from multiple angles according to input parameters of field actual equipment to the device, and check results from multiple angles are the same, and the device can quickly display the check results, so that the black start cannot be subjected to self-excitation, and the black start can be smoothly carried out according to expectations.
The invention is realized by the following technical scheme:
The black-start self-excitation checking device comprises a power supply module, an embedded processor module and a serial port touch display control screen, wherein an output voltage end of the power supply module is connected with the power supply ends of the embedded processor module and the serial port touch display control screen, the power supply module is used for supplying power to the embedded processor module and the serial port touch display control screen, a communication end of the embedded processor module is connected with a communication end of the serial port touch display control screen, the serial port touch display control screen is used for inputting electrical equipment parameters required by black-start self-excitation checking and transmitting the electrical equipment parameters to the embedded processor module, and the embedded processor module transmits self-excitation checking result information to the serial port touch display control screen for display after processing calculation;
And the embedded processor module checks self-excitation from the angles of a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm according to the collected black start electrical equipment parameters, and obtains a checking result through AND logic.
Preferably, the power module is formed by connecting two 1.5V rechargeable batteries in series, and is arranged in a battery box, and a power switch is arranged at the top of the battery box and used for switching on or switching off power output.
Preferably, the embedded processor module adopts a boundary circle method to check self-excitation, and the boundary circle satisfies the formula when the self-excitation occursJudging whether self-excitation occurs, wherein Xc is the equivalent capacitive reactance of a black start line, R is the resistance of the black start line, X'd is the direct-axis transient reactance of the generator, and Xq is the quadrature-axis reactance of the generator.
Preferably, when the embedded processor module adopts a line impedance comparison method to check self-excitation, whether self-excitation occurs or not is judged by the line impedance meeting a formula X C＜Xd+XT when the self-excitation occurs, xc is the equivalent capacitive reactance of a black start line, xd is the direct-axis synchronous reactance of the generator, and X T is the short-circuit impedance of the main transformer.
Preferably, when the embedded processor module adopts a capacity comparison method to check self-excitation, the capacity satisfies a formula Q >2L when the self-excitation does not occur, Q is the charging capacity of a sending line, the unit is ten thousand kVA, L is the distance of the sending line, and the unit is hundred kilometers.
Preferably, the embedded processor module adopts a rapid checking algorithm to check the self-excitation, and satisfies the formula of the rapid checking algorithm when the self-excitation does not occurS N is the capacity of the black start unit, the unit is MVA, w=2pi f, f is the frequency, U N is the rated voltage of the black start unit, the unit is kV, L is the length of a sending line, the unit is km, and C 1 is the capacity of the sending line, and the unit is uf/km.
Preferably, the embedded processor module adopts an STM32F103C type 32-bit processor, the clock frequency is 72Mhz, 48 pins are provided, and the memory RAM capacity is 20KB;
Preferably, the size of the serial port touch display control screen is 7 inches, the flash capacity is 64M, the RAM capacity of the memory is 512K, and the clock frequency is 200Mhz; and the serial port touch display control screen inputs the parameters of the black start electrical equipment and transmits the parameters to the embedded processor module, and the serial port touch display control screen displays the self-excitation checking results of the boundary circle method, the line impedance comparison method, the capacity comparison method and the rapid checking algorithm.
The black start self-excitation checking method based on the device of any one of the above steps comprises the following steps:
1) Checking the equivalent capacitive reactance Xc of a black start line, the resistance R of the black start line, the transient reactance X'd of a generator direct axis and the quadrature reactance Xq of the generator required by self-excitation by a boundary circle method at the input of a serial touch display control screen, and entering the step 2);
2) Checking the direct-axis synchronous electric Xd reactance of the generator required by self-excitation by a serial port touch display control screen input impedance comparison method, and entering a step 3) by using the short-circuit impedance XT of a main transformer;
3) Checking the charging capacity Q of a sending line required by self-excitation by a serial touch display control screen input capacity comparison method, and entering a step 4 by a distance L of the sending line;
4) Inputting a rapid checking algorithm to check the black start unit capacity SN required by self-excitation on a serial port touch display control screen, sending out a line capacitor C1, and entering a step 5);
5) The embedded processor module judges whether self excitation occurs according to input data, a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm, when all the judgment does not meet the condition of self excitation, the embedded processor module outputs and displays information which cannot occur when the self excitation occurs on a serial port touch display control screen, and when any condition meets the condition of self excitation, the embedded processor module outputs and displays the information which can occur when the self excitation occurs on the serial port touch display control screen, and then the embedded processor module enters step 6);
6) And developing black start according to the information displayed by the serial port touch display control screen.
Compared with the prior art, the invention has the following beneficial technical effects:
According to the invention, parameters of black start electric equipment are input into the serial port touch display control screen and are transmitted to the embedded processor module, the embedded processor module checks the angles of the self-excitation angles comprehensively from a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm, when all conditions are not satisfied, the information which cannot be subjected to self-excitation is displayed through the serial port touch display control screen, when any angle indicates that the self-excitation can be performed, the information which can be subjected to the self-excitation is also displayed through the serial port touch display control screen, a data basis is provided for black start field staff, and the black start is ensured to be performed under safe, controllable and reliable conditions.
Furthermore, the comprehensive boundary circle method, the line impedance comparison method, the capacity comparison method and the rapid checking algorithm judge whether the self-excitation occurs or not, the reliability of the multi-angle checking result is high and is close to the actual situation of the site, any algorithm indicates that the self-excitation occurs, and the device considers that the self-excitation occurs, so that the safety of black start is improved.
Furthermore, the serial touch display control screen can display data and input, does not need to additionally configure a setting module, has higher use efficiency, can interact with the embedded processor module by only needing a small amount of communication lines, and also supports touch input.
Furthermore, the battery box of the power supply module is provided with the power switch, so that the hardware circuit is not required to be provided with the power switch, and the hardware purchasing cost of the device is reduced.
Furthermore, the electric parameters input by the invention can be input according to the nameplate of the actual equipment, so that the accuracy of data input is ensured, the reliability of self-excitation is indirectly improved, and the invention is very convenient for on-site extension and use.
Furthermore, the embedded processor module adopts an ARM architecture system, has strong computing capacity and high precision, can meet the computing capacity requirement of the device, and further reduces the power consumption of the device by adopting a 3V power supply mode.
Drawings
FIG. 1 is a schematic block diagram of the apparatus of the present invention.
Fig. 2 is a circuit diagram of the device of the present invention.
In the figure: a power supply module 1; an embedded processor module 2; the serial port touches the display control screen 3.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention can solve the problems that the self-excitation checking means is single, the self-excitation checking is not carried out from multiple angles in the current black start technical field, and the black start self-excitation checking device which can be used in the field is lacking.
The invention discloses a black-start self-excitation checking device, which is shown in fig. 1 and comprises a power supply module 1, an embedded processor module 2 and a serial port touch display control screen 3, wherein an output voltage end of the power supply module 1 is connected with power supply ends of the embedded processor module 2 and the serial port touch display control screen 3, the power supply module 1 is used for supplying power to the embedded processor module 2 and the serial port touch display control screen 3, a communication end of the embedded processor module 2 is connected with a communication end of the serial port touch display control screen 3, the serial port touch display control screen 3 is used for inputting electrical equipment parameters required by black-start self-excitation checking and transmitting the electrical equipment parameters to the embedded processor module 2, and the embedded processor module 2 transmits self-excitation checking result information to the serial port touch display control screen 3 for display after processing and calculation.
In this embodiment, the power module 1 is formed by connecting two 1.5V rechargeable batteries in series, and is installed in a battery box, and a power switch is disposed at the top of the battery box, for turning on or off the power output.
In this embodiment, the embedded processor module 2 adopts an STM32F103C type 32-bit processor, the clock frequency is 72Mhz, the embedded processor module has 48 pins, and the memory RAM capacity is 20KB; and the embedded processor module 2 checks self-excitation from the angles of a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm according to the collected black start electrical equipment parameters, and comprehensively obtains a checking result.
In this embodiment, when the embedded processor module 2 checks the self-excitation by using the boundary circle method, the boundary circle satisfies the formula when the self-excitation occursJudging whether self-excitation occurs, wherein Xc is the equivalent capacitive reactance of a black start line, R is the resistance of the black start line, X'd is the direct-axis transient reactance of the generator, and Xq is the quadrature-axis reactance of the generator.
In this embodiment, when the embedded processor module 2 adopts a line impedance comparison method to check self-excitation, it is determined whether self-excitation occurs or not by the line impedance satisfying the formula X C＜Xd+XT when self-excitation occurs, xc is the equivalent capacitive reactance of the black start line, xd is the direct axis synchronous reactance of the generator, and X T is the short-circuit impedance of the main transformer.
In this embodiment, when the embedded processor module 2 adopts the capacity comparison method to check self-excitation, the capacity satisfies the formula Q >2L when self-excitation does not occur, Q is the charging capacity of the outgoing line, the unit is ten thousand kVA, L is the distance of the outgoing line, and the unit is hundred kilometers.
In this embodiment, as shown in fig. 2, the power module (1) of the device includes a battery BT1 and a power interface P1, where an anode of the battery BT1 is connected to a1 st pin of the power interface P1, and a cathode of the battery BT1 is connected to a2 nd pin of the power interface P1; the embedded processor module (2) is characterized by comprising a processor chip U1, a diode D2, a crystal oscillator J1, a capacitor C1 and a capacitor C2, wherein an 8 th pin, a 23 rd pin, a 35 th pin and a 47 th pin of the processor chip U1 are connected with a power interface P1 nd pin, a 9 th pin, a 24 th pin, a 36 th pin and a 48 th pin of the processor chip U1 are connected with a1 st pin of the power interface P1, an anode of the diode D2 is connected with the 1 st pin of the power interface P1, a cathode is connected with the 1 st pin of the processor chip U1, the capacitor C1 and the capacitor C2 are connected in series and then are connected with two ends of the crystal oscillator J1 in parallel, two ends of the crystal oscillator J1 are respectively connected with a 5 th pin and a 5 th pin of the processor chip U1, and a common point of connection of the capacitor C1 and the capacitor C2 is connected with the 2 nd pin of the power interface P1; the serial port touch display control screen 3 is an integrated display D1, the 1 st pin of the integrated display D1 is connected with the 1 st pin of the power interface P1, the 2 nd pin of the integrated display D1 is connected with the 2 nd pin of the power interface P1, the 3 rd pin and the 4 th pin of the integrated display D1 are respectively connected with the 13 th pin and the 23 rd pin of the processor chip U1, the 13 rd pin and the 23 rd pin of the processor chip U1 are connected with the 3 rd pin and the 4 th pin of the integrated display D1 to form a serial communication port for data transmission.
In this embodiment, when the embedded processor module 2 adopts the rapid checking algorithm to check the self-excitation, the formula of the rapid checking algorithm is satisfied when the self-excitation does not occurS N is the capacity of the black start unit, the unit is MVA, w=2pi f, f is the frequency, U N is the rated voltage of the black start unit, the unit is kV, L is the length of a sending line, the unit is km, and C 1 is the capacity of the sending line, and the unit is uf/km.
In this embodiment, the size of the serial port touch display control screen 3 is 7 inches, the flash capacity is 64M, the memory RAM capacity is 512K, and the clock frequency is 200Mhz; the serial port touch display control screen 3 inputs the parameters of the black start electrical equipment and transmits the parameters to the embedded processor module 2, and the serial port touch display control screen 3 displays the self-excitation checking results of the boundary circle method, the line impedance comparison method, the capacity comparison method and the rapid checking algorithm.
A black start self-excitation checking method comprises the following steps:
1) Inputting a boundary circle method to check the equivalent capacitive reactance Xc of a black start line, the resistance R of the black start line, the transient reactance X'd of a generator direct axis and the quadrature reactance Xq of the generator required by self-excitation on a serial touch display control screen 3, and entering a step 2);
2) Checking the synchronous electric Xd reactance of the direct axis of the generator required by self excitation by a serial port touch display control screen 3 input impedance comparison method, and entering a step 3) by using the short-circuit impedance XT of a main transformer;
3) Checking the charging capacity Q of a sending line required by self-excitation by a capacity comparison method on a serial touch display control screen 3, and entering a step4 by a distance L of the sending line;
4) Inputting a rapid checking algorithm to check the black start unit capacity SN required by self excitation on the serial port touch display control screen 3, sending out a line capacitor C1, and entering a step 5);
5) The embedded processor module 2 judges whether self excitation occurs according to input data, a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm, when all the judgment does not meet the condition of self excitation, the embedded processor module outputs and displays information which cannot occur when the self excitation occurs on the serial port touch display control screen 3, and when any condition meets the condition of self excitation, the embedded processor module outputs and displays the information which can occur when the self excitation occurs on the serial port touch display control screen (3) and enters step 6);
6) The worker starts the black start according to the information displayed by the serial port touch display control screen 3.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, but any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. The black-start self-excitation checking device is characterized by comprising a power supply module (1), an embedded processor module (2) and a serial port touch display control screen (3), wherein an output voltage end of the power supply module (1) is connected with power supply ends of the embedded processor module (2) and the serial port touch display control screen (3), the power supply module (1) is used for supplying power to the embedded processor module (2) and the serial port touch display control screen (3), a communication end of the embedded processor module (2) is connected with a communication end of the serial port touch display control screen (3), and the serial port touch display control screen (3) is used for inputting electrical equipment parameters required by black-start self-excitation checking and transmitting the electrical equipment parameters to the embedded processor module (2), and the embedded processor module (2) transmits self-excitation checking result information to the serial port touch display control screen (3) for display after processing calculation;
The embedded processor module (2) checks self-excitation from the angles of a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm according to the collected black start electrical equipment parameters, and obtains a checking result through AND logic;
when the embedded processor module (2) adopts a boundary circle method to check self-excitation, the boundary circle satisfies the formula when the self-excitation occurs Judging whether self-excitation occurs, wherein Xc is the equivalent capacitive reactance of a black start line, R is the resistance of the black start line, X'd is the direct-axis transient reactance of the generator, and Xq is the quadrature-axis reactance of the generator;
When the embedded processor module (2) adopts a line impedance comparison method to check self-excitation, the line impedance satisfies the formula when the self-excitation occurs Judging whether self-excitation occurs, wherein Xc is the equivalent capacitive reactance of a black start circuit, xd is the synchronous reactance of a generator direct shaft, and X T is the short-circuit impedance of a main transformer;
When the embedded processor module (2) adopts a capacity comparison method to check self-excitation, the capacity satisfies a formula Q >2L when the self-excitation does not occur, Q is the charging capacity of a sending line, the unit is ten thousand kVA, L is the distance of the sending line, and the unit is hundred kilometers;
The embedded processor module (2) adopts a rapid checking algorithm to check self-excitation, and satisfies the following formula by the rapid checking algorithm when the self-excitation does not occur S N is the black start unit capacity, in MVA, w=2pi f, f is the frequency, U N is the black start unit rated voltage, in kV, L is the outgoing line length, in km, C 1 is the outgoing line capacity, in uf/km.
2. The black-start self-excitation checking device according to claim 1, wherein the power module (1) is formed by connecting two 1.5V rechargeable batteries in series, and is arranged in a battery box, and a power switch is arranged at the top of the battery box and used for switching on or off power output.
3. The black-start self-excitation checking device according to claim 1, wherein the embedded processor module (2) adopts an STM32F103C type 32-bit processor, the clock frequency is 72Mhz, the number of pins is 48, and the memory RAM capacity is 20KB.
4. The black-start self-excitation checking device according to claim 1, wherein the size of the serial touch display control screen (3) is 7 inches, the flash capacity is 64M, the memory RAM capacity is 512K, and the clock frequency is 200Mhz; and the serial port touch display control screen (3) inputs the parameters of the black start electrical equipment and transmits the parameters to the embedded processor module (2), and the serial port touch display control screen (3) displays the self-excitation checking results of the boundary circle method, the line impedance comparison method, the capacity comparison method and the rapid checking algorithm.
5. A black start self-excitation checking method, characterized by comprising the following steps, based on the device of any one of claims 1-4:
1) Checking the equivalent capacitive reactance Xc, the resistance R of a black start line, the transient reactance X'd of a generator direct axis and the quadrature reactance Xq of the generator required by self excitation by a boundary circle method on a serial touch display control screen (3), and entering a step 2);
2) Checking the direct-axis synchronous electric Xd resistance of the generator required by self-excitation by a serial port touch display control screen (3) input impedance comparison method, and entering a step 3) by using the short-circuit impedance X T of the main transformer;
3) Checking the charging capacity Q of a sending line required by self-excitation by a serial port touch display control screen (3) input capacity comparison method, and entering a step 4 by a distance L of the sending line;
4) Inputting a rapid checking algorithm to check the capacity S N of the black start unit required by self-excitation on a serial port touch display control screen (3), sending out a line capacitor C 1, and entering a step 5);
5) The embedded processor module (2) judges whether self excitation occurs or not according to input data, a boundary circle method, a line impedance comparison method, a capacity comparison method and a rapid checking algorithm, when all the judgment does not meet the condition that self excitation occurs, the information which does not occur when self excitation occurs is output and displayed on the serial port touch display control screen (3), when any condition meets the condition that self excitation occurs, the information which occurs when self excitation occurs is output and displayed on the serial port touch display control screen (3), and the step 6 is entered;
6) And developing black start according to the information displayed by the serial port touch display control screen (3).
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| 发电机自励磁快速验算方法及其应用;蔡汉生;陈喜鹏;胡玉峰;贾磊;史丹;;南方电网技术(第02期);全文 * |
| 同步发电机异步自励磁保护研究;钱华东;中国优秀硕士学位论文全文数据库 (工程科技Ⅱ辑);全文 * |
| 基于ARM+DSP+FPGA的黑启动监控装置研究;田鲁琦;杨淏翔;史文博;李俊杰;张超明;;电气时代(第05期);全文 * |
| 基于PSCAD/EMTDC的黑启动中发电机自励磁仿真;姜世金;尚景刚;刘子军;刘源;赵冰;;东北电力大学学报(自然科学版)(第02期);全文 * |
| 电网黑启动中发电机自励磁仿真研究;梁海平;陈国荣;王丽莎;贾京华;王勇;顾雪平;;河北电力技术;20101025(第05期);全文 * |
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