Power system data recording analyzer control method

Abstract

The invention discloses a control method for a data recording analyzer of an electric power system, relates to a control method for a data recording analyzer, and aims to solve the problem that the field test of the existing data recording analyzer of the electric power system is inconvenient. According to the invention, the main control module is in data communication with a power system data recording analyzer to generate a frequency square wave signal and a digital electric signal; amplifying the frequency square wave signal, and outputting the amplified frequency square wave signal; converting the digital electric signal into an analog electric signal, amplifying the analog electric signal, and outputting the amplified analog electric signal; and the amplified frequency square wave signal and the amplified analog electric signal act on the power system data recording analyzer. The beneficial effect is that the convenience of the field test of the power system data recording analyzer is improved.

Description

Technical Field

[0001] The invention relates to a data recording and analyzing instrument control method. Background Art

[0002] The power system data recorder and analyzer is a programmable motor controller designed for parsing and analyzing the data logs of generators in power systems. It can record detailed operating data of generators. When performing parameter identification, setting and modeling tests on generator speed control systems, it is necessary to apply frequency signals with specific change rules and analog output signals of various transmitters to the speed control system according to specific requirements, and use a signal recorder to record the dynamic change process of the generator terminal voltage frequency and the controlled object, and analyze the characteristic parameters of the speed control system based on the recorded dynamic data. Finally, based on the measured characteristic parameters, it is determined whether the parameters of the speed control system are appropriate or modified. The following technical problems currently exist:

[0003] Operating several instruments at the same time on site increases the complexity of the test work. The most critical thing is that it is difficult for various general frequency channel modules to output regularly changing frequencies according to the specific changing rules required by the test. During on-site testing, the frequency output can only be controlled by manual adjustment. In this way, the control accuracy cannot meet the requirements, and the complexity of the test is greatly increased, which brings great difficulties to on-site testing. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of inconvenient on-site testing of the existing power system data recorder and analyzer, and proposes a control method for the power system data recorder and analyzer.

[0005] A control method for a power system data recorder and analyzer according to the present invention comprises the following steps:

[0006] Step 1: perform data communication with the power system data recorder and analyzer to generate a frequency square wave signal and a digital electrical signal;

[0007] Step 2: amplify the frequency square wave signal generated in step 1, and output the amplified frequency square wave signal; the amplified frequency square wave signal acts on the power system data recorder and analyzer;

[0008] Step 3: convert the digital electrical signal generated in step 1 into an analog electrical signal and amplify it, output the amplified analog electrical signal, and apply the amplified analog electrical signal to the power system data recorder and analyzer.

[0009] Furthermore, the frequency square wave signal after amplification in step 2 includes: a unipolar square wave signal and a bipolar square wave signal.

[0010] Furthermore, the analog electrical signal amplified in step three includes a voltage source signal and a current source signal.

[0011] Furthermore, in the step one, data communication is performed with the power system data recording and analyzing instrument through the main control module.

[0012] Furthermore, the main control module receives instructions sent by the power system data recorder and analyzer, and the instructions may include: instructions for generating a frequency square wave signal, instructions for generating a target analog quantity, and instructions for measuring an input frequency.

[0013] Furthermore, the data recorder analyzer control method further includes a frequency acquisition step;

[0014] The frequency acquisition step is used to acquire the frequency of the generator terminal voltage signal.

[0015] Furthermore, the frequency acquisition step is implemented by a frequency acquisition module;

[0016] The frequency acquisition module includes: a voltage divider circuit, an isolation amplifier circuit, a signal amplifier circuit and a zero-crossing comparator;

[0017] The output end of the voltage divider circuit is connected to the input end of the isolation amplifier circuit, the output end of the isolation amplifier circuit is connected to the input end of the signal amplifier circuit, the output end of the signal amplifier circuit is connected to the input end of the zero-crossing comparator, and the output end of the zero-crossing comparator is connected to the main control module through a CAP interface;

[0018] The zero-crossing comparator is used to convert the AC voltage signal into a frequency square wave signal.

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

[0020] The control method of an electric power system data recorder and analyzer described in the present invention provides frequency and analog output for the electric power system data recorder and analyzer, and collects the frequency of the generator terminal voltage signal connected to the electric power system data recorder and analyzer, so that when the generator speed control system is tested on site, only the signal controller provided by the embodiment of the present invention can be carried, which alleviates the technical problems existing in the prior art of inconvenient transmitter analog signals, generator frequency signal application and dynamic measurement and recording of the generator terminal voltage signal frequency during the generator speed control system field test, and solves the problem of inconvenient field testing of the electric power system data recorder and analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of a control method for a power system data recorder and analyzer as described in a specific implementation mode 1. DETAILED DESCRIPTION

[0022] Specific implementation method 1. Combination Figure 1 This embodiment describes a method for controlling a data recorder and analyzer for a power system, and the method comprises the following steps:

[0023] Step 1: perform data communication with the power system data recorder and analyzer to generate a frequency square wave signal and a digital electrical signal;

[0024] Step 2: amplify the frequency square wave signal generated in step 1, and output the amplified frequency square wave signal; the amplified frequency square wave signal acts on the power system data recorder and analyzer;

[0025] Step 3: convert the digital electrical signal generated in step 1 into an analog electrical signal and amplify it, output the amplified analog electrical signal, and apply the amplified analog electrical signal to the power system data recorder and analyzer.

[0026] In this embodiment, the frequency square wave signal and the digital electrical signal generated in step 1 are amplified and converted respectively, and then fed back to the power system data recorder and analyzer to control the power system data recorder and analyzer.

[0027] Specific implementation method 2: This implementation method further limits the control method of the power system data recorder and analyzer described in specific implementation method 1. In this implementation method, the frequency square wave signal after amplification in step 2 includes: a unipolar square wave signal and a bipolar square wave signal.

[0028] In this embodiment, the frequency square wave signal after amplification in step 2 is output after photoelectric isolation, signal amplification, level biasing and power amplification, and the unipolar square wave signal and the bipolar square wave signal are divided into two paths and output simultaneously, wherein the voltage of the unipolar square wave signal is 0V when the level is low; the voltage of the bipolar square wave signal is -13V when the level is low.

[0029] Specific implementation method three: This implementation method further limits the control method of the power system data recorder and analyzer described in specific implementation method one. In this implementation method, the analog electrical signal amplified in step three includes a voltage source signal and a current source signal.

[0030] In this embodiment, a digital-to-analog converter, also called a D / A converter, is used to convert a digital signal into an analog signal; the model of the digital-to-analog converter is a DAC8802 high-speed analog-to-digital converter, and the output signal is 0 to ±5V.

[0031] Specific implementation method 4: This implementation method further limits the control method of the power system data recorder and analyzer described in specific implementation method 1. In this implementation method, in step 1, data communication is performed with the power system data recorder and analyzer through the main control module.

[0032] In this embodiment, the main control module is connected to the power system data recorder and analyzer via an RS232 interface;

[0033] The main control module has the following functions:

[0034] (1) It realizes the function of communicating with the main controller of the power system data recorder and analyzer, can receive and execute various commands issued by the main controller of the power system data recorder and analyzer, and can upload the collected frequency data to the main controller of the power system data recorder and analyzer in real time;

[0035] (2) capturing the frequency signal acquired by the frequency acquisition module 40 and calculating the frequency of the frequency signal;

[0036] (3) Output PWM signal according to the set frequency change rule;

[0037] (4) Output digital electrical signals according to the set analog quantization rules.

[0038] Specific implementation method five: This implementation method further limits the control method of a power system data recorder and analyzer described in specific implementation method four. In this implementation method, the main control module receives instructions issued by the power system data recorder and analyzer. The instructions may include: instructions for generating a frequency square wave signal, instructions for generating a target analog quantity, and instructions for measuring the input frequency.

[0039] Specific implementation method 6. This implementation method further limits the control method of a power system data recorder and analyzer described in specific implementation method 4. In this implementation method, the control method of the data recorder and analyzer further includes a frequency acquisition step;

[0040] The frequency acquisition step is used to acquire the frequency of the generator terminal voltage signal.

[0041] In this embodiment, the frequency acquisition step is implemented by a frequency acquisition module;

[0042] The frequency acquisition module includes: a voltage divider circuit, an isolation amplifier circuit, a signal amplifier circuit and a zero-crossing comparator;

[0043] The output end of the voltage divider circuit is connected to the input end of the isolation amplifier circuit, the output end of the isolation amplifier circuit is connected to the input end of the signal amplifier circuit, the output end of the signal amplifier circuit is connected to the input end of the zero-crossing comparator, and the output end of the zero-crossing comparator is connected to the main control module through a CAP interface;

[0044] The zero-crossing comparator is used to convert the AC voltage signal into a frequency square wave signal.

[0045] In this embodiment, the voltage divider circuit is used for current limiting and voltage division. Since the linear optocoupler actually adopts the voltage isolation amplification principle, the primary voltage is required to be below 200mV, so the input signal is divided by the voltage divider circuit so that the input AV0.5-AC150V AC voltage at the primary side of the linear optocoupler is 10mV~140mV.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control method for a power system data recorder and analyzer, characterized in that: The data recorder analyzer control method comprises the following steps: Step 1: perform data communication with the power system data recorder and analyzer to generate a frequency square wave signal and a digital electrical signal; Step 2: amplify the frequency square wave signal generated in step 1, and output the amplified frequency square wave signal; the amplified frequency square wave signal acts on the power system data recorder and analyzer; Step 3: convert the digital electrical signal generated in step 1 into an analog electrical signal and amplify it, output the amplified analog electrical signal, and apply the amplified analog electrical signal to the power system data recorder and analyzer.

2. A control method for a power system data recorder and analyzer according to claim 1, characterized in that: The frequency square wave signal after amplification in the step 2 includes: a unipolar square wave signal and a bipolar square wave signal.

3. A control method for a power system data recorder and analyzer according to claim 1, characterized in that: The analog electrical signal amplified in step three includes a voltage source signal and a current source signal.

4. A control method for a power system data recorder and analyzer according to claim 1, characterized in that: In the step 1, data communication is performed with the power system data recording and analyzing instrument through the main control module.

5. A method for controlling a power system data recorder and analyzer according to claim 4, characterized in that: The main control module receives instructions sent by the power system data recorder and analyzer, and the instructions may include: instructions for generating a frequency square wave signal, instructions for generating a target analog quantity, and instructions for measuring an input frequency.

6. A method for controlling a power system data recorder and analyzer according to claim 4, characterized in that: The data recorder analyzer control method further comprises a frequency acquisition step; The frequency acquisition step is used to acquire the frequency of the generator terminal voltage signal.

7. A method for controlling a power system data recorder and analyzer according to claim 6, characterized in that: The frequency acquisition step is implemented by a frequency acquisition module; The frequency acquisition module includes: a voltage divider circuit, an isolation amplifier circuit, a signal amplifier circuit and a zero-crossing comparator; The output end of the voltage divider circuit is connected to the input end of the isolation amplifier circuit, the output end of the isolation amplifier circuit is connected to the input end of the signal amplifier circuit, the output end of the signal amplifier circuit is connected to the input end of the zero-crossing comparator, and the output end of the zero-crossing comparator is connected to the main control module through a CAP interface; The zero-crossing comparator is used to convert the AC voltage signal into a frequency square wave signal.

Images