CN110646666A - High-precision network frequency homologous direct mining device and method thereof - Google Patents
High-precision network frequency homologous direct mining device and method thereof Download PDFInfo
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- CN110646666A CN110646666A CN201910892044.2A CN201910892044A CN110646666A CN 110646666 A CN110646666 A CN 110646666A CN 201910892044 A CN201910892044 A CN 201910892044A CN 110646666 A CN110646666 A CN 110646666A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The invention discloses a high-precision network frequency homologous direct mining device and a method thereof. The high-precision network frequency homologous direct-mining device is used for matching a thermal power generating unit and comprises a CPU (Central processing Unit) board, a sampling board, an analog output board and a power supply module. The CPU board includes a microprocessor based 32-bit processor platform. The sampling plate comprises a loop for acquiring primary system frequency, a main transformer high-voltage side loop, an excitation transformer high-voltage side loop, a starting standby transformer high-voltage side loop and a high-voltage side loop of a high-voltage station transformer. The high-precision network frequency homologous direct mining device and the method thereof disclosed by the invention have the advantages that the structure is simple, the performance is reliable, the requirement of a generator set for fast response required by primary frequency modulation can be met, the network frequency signal homology precision is high, and the primary frequency modulation response qualification rate of the generator set can be improved.
Description
Technical Field
The invention belongs to the technical field of frequency signal sampling, and particularly relates to a high-precision network frequency homologous direct sampling device and a high-precision network frequency homologous direct sampling method.
Background
The invention discloses a thermal power generating unit primary frequency modulation performance evaluation method and system based on a system identification technology, which is published with the publication number of CN108717491B, and the technical scheme discloses that the evaluation method and the system run on a processor and are configured to execute the following instructions: collecting required sampling data according to a certain sampling period; taking the rotating speed and the main steam pressure of a steam turbine as two inputs, taking the actual power of a generator as an output, and applying a system identification technology to obtain a linear time invariant model for describing an input-output relationship; evaluating the quality of the model obtained by identification through a hypothesis testing method; the performance evaluation results are obtained from the unit step response of the model if the model quality is good. "
The invention relates to a thermal power generating unit, however, a large-scale assessment event of the thermal power generating unit is caused by the fact that the primary frequency modulation responds to the shortage of the load of a power grid sometimes happens. The analysis shows that the asynchronous acquisition clock is mainly caused by asynchronous frequency modulation load response, different sources of frequency signals adopted by power grid examination and thermal power unit measurement signals, power plant PMU faults and the influence of boiler combustion on unit actual load.
The change trend of the network frequency signals adopted by the power grid examination is theoretically ahead of the rotating speed signals of the thermal power generating unit, at present, a magneto-resistance probe is adopted for measuring the rotating speed of the thermal power generating unit, and the designed tooth number is generally 60 teeth. Resulting in a large deviation of the actual speed feedback and a long delay time. Meanwhile, due to poor interference resistance, frequency signals are often deviated due to interference.
The primary frequency modulated signal comes from the tachometer card of the DEH. Because the range of the DEH tachometer card is 0 to 1 ten thousand revolutions, the tachometer card has the precision of one thousandth and is far lower than the precision of one 10 ten thousand, namely the resolution of 0.1 revolution can not be achieved. Therefore, in the configuration of the primary frequency modulation of the unit, the function dead zone of the primary frequency modulation is usually set to +/-1.6 revolutions instead of +/-2 revolutions according to the regulations, so that the number of primary frequency modulation actions of the unit per month is increased by more than 1 time compared with the normal condition, the disturbance is caused to the unit, the service life of a steam turbine regulating valve is influenced, and the like.
Although a power grid frequency signal exists in a power grid transmission DCS system, the measuring range is generally 45-55 Hz, and the precision cannot meet the requirement. The time is long, and the requirement of quick response is difficult to meet.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a high-precision network frequency homologous direct acquisition device and a high-precision network frequency homologous direct acquisition method.
The invention adopts the following technical scheme that the high-precision network frequency homologous direct-sampling device is used for matching a thermal power generating unit and comprises a CPU (central processing unit) board, a sampling board, an analog quantity output board and a power supply module, wherein:
the CPU board comprises a microprocessor based on a 32-bit processor platform;
the sampling plate comprises a loop which is used for acquiring the frequency of a primary system, a main transformer high-voltage side loop, an excitation transformer high-voltage side loop, a starting standby transformer high-voltage side loop and a high-voltage side loop of a high-voltage station transformer, and is used for sampling two groups of transformer high-voltage side measurement voltages and sampling two groups of transformer high-voltage side measurement currents so as to respectively calculate high-precision frequency signals of the main transformer high-voltage side loop and the other group of transformer high-voltage side loop;
the analog quantity output board is connected with the sampling board through the CPU board, and the power supply module is used for supplying working power to other functional modules.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the two sets of transformer high-voltage side measurement voltages are specifically measurement voltages of a main transformer high-voltage side PT and measurement voltages of another set of transformer high-voltage side PT.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the two sets of transformer high-voltage side measurement currents are specifically measurement currents of a main transformer high-voltage side CT and measurement currents of another set of transformer high-voltage side CT.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the sampling plate is further used for collecting electrical parameters, where the electrical parameters include, but are not limited to, active power, reactive power, high-precision frequency, a-phase voltage, B-phase voltage, C-phase voltage, AB-phase voltage, BC-phase voltage, CA-phase voltage, a-phase current, B-phase current, and C-phase current.
According to the technical scheme, as a further preferable technical scheme of the technical scheme, the analog quantity output board adopts a 4-20 mA current signal when outputting.
According to the technical scheme, as a further preferable technical scheme of the technical scheme, each thermal power generating unit is provided with three completely independent high-precision grid frequency homologous direct acquisition devices, and each high-precision grid frequency homologous direct acquisition device realizes real-time calculation and independently outputs 3 high-precision frequency signals by using a Fourier algorithm according to PT three-phase voltages homologous with a PMU so as to participate in primary frequency modulation.
The invention also discloses a high-precision network frequency homologous direct sampling method, which comprises the following steps:
step S1: each thermal power generating unit is provided with three completely independent high-precision grid frequency same-source direct-mining devices as claimed in claim 1;
step S2: each high-precision network frequency homologous direct acquisition device realizes real-time calculation by utilizing a Fourier algorithm and independently outputs 3 high-precision frequency signals according to PT three-phase voltage homologous with the PMU;
step S3: the primary frequency modulation is participated in according to 3 independent high-precision frequency signals.
The high-precision network frequency homologous direct mining device and the method thereof have the advantages that the problem that the unit has insufficient primary frequency modulation response to the power grid is solved, the device is simple in structure and reliable in performance, the requirement of the generator set for fast response to the primary frequency modulation can be met, the network frequency signal homology precision is high, and the primary frequency modulation response qualification rate of the unit can be improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a system block diagram of the present invention.
Fig. 3 is a working principle diagram of the present invention.
Detailed Description
The invention discloses a high-precision network frequency homologous direct mining device and a high-precision network frequency homologous direct mining method, and the specific implementation mode of the invention is further described below by combining with the preferred embodiment.
Referring to fig. 1 to 3 of the drawings, fig. 1 shows an external structure of the high-precision network frequency homologous direct mining device, fig. 2 shows a system structure of the high-precision network frequency homologous direct mining device, and fig. 3 shows a working principle of the high-precision network frequency homologous direct mining device.
Preferred embodiments.
Preferably, the high-precision network frequency homologous direct acquisition device comprises a CPU board, a sampling board, an analog output board, and a power module, wherein:
the CPU board comprises a microprocessor based on a 32-bit processor platform;
the sampling plate comprises a loop which is used for acquiring the frequency of a primary system, a main transformer high-voltage side loop, an excitation transformer high-voltage side loop, a starting standby transformer high-voltage side loop and a high-voltage side loop of a high-voltage station transformer, and is used for sampling two groups of transformer high-voltage side measurement voltages and sampling two groups of transformer high-voltage side measurement currents so as to respectively calculate high-precision frequency signals of the main transformer high-voltage side loop and the other group of transformer high-voltage side loop;
the analog quantity output board is connected with the sampling board through the CPU board, and the power supply module is used for supplying working power supply to other functional modules (such as the CPU board).
Further, the two sets of transformer high-voltage side measurement voltages are specifically measurement voltages of a main transformer high-voltage side PT and measurement voltages of another set of transformer high-voltage side PT.
Further, the two sets of transformer high-voltage side measurement currents are specifically measurement currents of a main transformer high-voltage side CT and measurement currents of another set of transformer high-voltage side CT.
Further, the sampling plate is also used for collecting electrical parameters including, but not limited to, active power, reactive power, high precision frequency, phase a voltage, phase B voltage, phase C voltage, phase AB voltage, phase BC voltage, phase CA voltage, phase a current, phase B current, and phase C current.
Furthermore, the analog quantity output board adopts a 4-20 mA current signal when outputting.
Furthermore, each thermal power generating unit is provided with three completely independent high-precision grid frequency homologous direct acquisition devices, each high-precision grid frequency homologous direct acquisition device realizes real-time calculation by utilizing a Fourier algorithm according to PT three-phase voltage homologous with a PMU and independently outputs 3 high-precision frequency signals, so that the high-precision grid frequency homologous direct acquisition devices participate in primary frequency modulation.
Furthermore, each high-precision network frequency homologous direct-sampling device can accurately measure the frequency within 20ms, and the precision is one thousandth.
According to the above embodiments, the high-precision network frequency homologous direct mining device and the method thereof disclosed in the patent application of the present invention are specifically described as follows.
The high-precision network frequency homologous direct acquisition device/method is used for matching thermal power generating units, each thermal power generating unit is provided with three completely independent high-precision network frequency homologous direct acquisition devices, the units respond to primary frequency modulation (serving as a signal sampling device/a special primary frequency modulation sampling device/a primary frequency modulation sampling device of the thermal power generating unit), PT three-phase voltage homologous with a PMU is accessed, the frequency is calculated in real time by adopting a Fourier algorithm, the frequency can be accurately measured within 20ms, and the precision is one thousandth, so that three independent high-precision frequency signals are output to participate in primary frequency modulation.
The invention mainly relates to a quick transmission device based on a high-performance 32-bit processor platform, which is mainly used for acquiring a primary system frequency and a circuit of a generator rotating speed, a main transformer high-voltage side circuit, an excitation transformer high-voltage side circuit, a starting standby transformer high-voltage side circuit and a high-voltage side circuit of a high-voltage station transformer, can also sample voltage (a main transformer high-voltage side PT and another transformer high-voltage side PT) measured by the high-voltage sides of two groups of transformers and current (a main transformer high-voltage side CT and another transformer high-voltage side CT) measured by the high-voltage sides of the two groups of transformers, and respectively calculates electrical parameters of the main transformer high-voltage side circuit and the another transformer high-voltage side circuit by a primary frequency modulation sampling device, wherein the electrical parameters comprise but are not limited to active power, reactive power, high-precision frequency, A, The current control circuit comprises BC interphase voltage, CA interphase voltage, A phase current, B phase current and C phase current, wherein each electrical parameter is output by 4-20 mA current signals respectively and is used by a DCS.
The frequency precision can reach 0.2% grade within the range of 49.8-50.2 Hz, and is not affected by harmonic waves.
The invention is suitable for three-phase four-wire system (three-phase voltage and three-phase current input) and three-phase three-wire system (AB and BC interphase voltage is switched in, phase A and phase C currents are switched in), and has reliable PT broken wire and CT broken wire distinguishing functions. The requirements of high reliability, high precision and quick response of unit primary frequency modulation signal sampling are met.
The invention can be installed by combining screens, can also be installed on the spot on any occasion needing to be used, can bear the vibration impact with the harsh grade of I grade, and has the characteristics of simple structure, reliable performance, high sampling precision and the like.
According to the embodiment, the invention further discloses a high-precision network frequency homologous direct mining method, and the high-precision network frequency homologous direct mining device is used for implementing the high-precision network frequency homologous direct mining device.
It is worth mentioning that the high-precision network frequency homologous direct mining device disclosed by the patent application of the invention comprises a powerful hardware platform: the CPU board (32-bit microprocessor) is adopted, the calculation speed is high, and components such as the sampling board, the analog quantity output board, the power module and the like are all industrial products, so that the performance is reliable.
As shown in FIG. 3, the CPU board is a 32-bit ARM chip with 192Kx16 bit RAM memory and 1024Kx16 bit FLASH. The chip expands 8Kx8 bit serial EEPROM.
The data acquisition system comprises a high-reliability 16-bit A/D converter, a multi-way switch and a filtering loop.
The A/D conversion chip has the characteristics of high conversion speed, small sampling deviation, ultra-small power consumption, good stability and the like.
The sampling loop has no adjustable element and does not need to be adjusted on site, and the sampling loop has high reliability.
Mass storage: the device is provided with a large-capacity RAM (SRAM), a serial EEPROM is used for storing fixed values, and 1 set of fixed values can be preset to adapt to various operating conditions.
Event recording: the action process of the control function is transparent, the information record is complete, and complete accident recall information is provided.
Designing software: in software design, all modules are completely separated, functions do not depend on a communication network, and communication faults are not influenced.
Perfect communication: the safe and reliable field control bus technology (double RS485, the transmission rate is 19.2kbps, the Ethernet transmission rate is 10M/100Mbps) is used, and the communication protocol is MODBUS-RTU.
Fault recording: the fault recorder has a fault recording function and can record voltage, current, frequency, active power and other waveforms when a fault occurs.
The integral structure is as follows: as shown in figure 1, the device adopts a fully-sealed embedded 4U structure, the height of the device is 1/3 width of 19 inches, and the anti-seismic capacity and the anti-electromagnetic interference capacity of the device can fully meet the anti-electromagnetic interference performance test specified in GB/T14598 and various mechanical performance tests specified in GB/T7261 and 2000 types.
The anti-interference performance is as follows: the software and hardware redundancy design, perfect software and hardware self-check, secondary watchdog and strong anti-interference performance.
Full Han chemical liquid crystal display: and the field operation debugging personnel are convenient to operate.
It should be noted that technical features such as specific model selection of the large-capacity RAM related to the present patent application should be regarded as the prior art, specific structures, operation principles, control modes and spatial arrangement modes of the technical features may be selected conventionally in the field, and should not be regarded as the invention points of the present patent, and the present patent is not further specifically described in detail.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a device is directly adopted to high accuracy net frequency homology for match thermal power generating unit, its characterized in that includes CPU board, sampling board, analog output board, power module, wherein:
the CPU board comprises a microprocessor based on a 32-bit processor platform;
the sampling plate comprises a loop which is used for acquiring the frequency of a primary system, a main transformer high-voltage side loop, an excitation transformer high-voltage side loop, a starting standby transformer high-voltage side loop and a high-voltage side loop of a high-voltage station transformer, and is used for sampling two groups of transformer high-voltage side measurement voltages and sampling two groups of transformer high-voltage side measurement currents so as to respectively calculate high-precision frequency signals of the main transformer high-voltage side loop and the other group of transformer high-voltage side loop;
the analog quantity output board is connected with the sampling board through the CPU board, and the power supply module is used for supplying working power to other functional modules.
2. The high-precision grid frequency homologous direct mining device according to claim 1, wherein said two sets of transformer high-voltage side measurement voltages are specifically measurement voltages of a main transformer high-voltage side PT and measurement voltages of another set of transformer high-voltage side PT.
3. The apparatus according to claim 1, wherein the two sets of transformer high-voltage side measurement currents are measurement currents of a main transformer high-voltage side CT and measurement currents of another set of transformer high-voltage side CT.
4. The high accuracy grid frequency homologous direct sampling device according to any of claims 1-3, wherein said sampling plate is further used to collect electrical parameters including but not limited to active power, reactive power, high accuracy frequency, A phase voltage, B phase voltage, C phase voltage, AB phase-to-phase voltage, BC phase-to-phase voltage, CA phase-to-phase voltage, A phase current, B phase current, C phase current.
5. The high-precision network frequency same-source direct-sampling device according to any one of claims 1 to 3, wherein the analog quantity output board adopts a 4-20 mA current signal when outputting.
6. The high-precision grid frequency homologous direct acquisition device according to any one of claims 1-3, wherein each thermal power generating unit is provided with three completely independent high-precision grid frequency homologous direct acquisition devices, and each high-precision grid frequency homologous direct acquisition device realizes real-time calculation and independently outputs 3 high-precision frequency signals according to PT three-phase voltages homologous to PMU by utilizing a Fourier algorithm so as to participate in primary frequency modulation.
7. A high-precision network frequency homologous direct sampling method is characterized by comprising the following steps:
step S1: each thermal power generating unit is provided with three completely independent high-precision grid frequency same-source direct-mining devices as claimed in claim 1;
step S2: each high-precision network frequency homologous direct acquisition device realizes real-time calculation by utilizing a Fourier algorithm and independently outputs 3 high-precision frequency signals according to PT three-phase voltage homologous with the PMU;
step S3: the primary frequency modulation is participated in according to 3 independent high-precision frequency signals.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112953002A (en) * | 2021-02-04 | 2021-06-11 | 华能（天津）煤气化发电有限公司 | Power transmitter safety optimization configuration method for DEH (distributed energy optimization) regulation of power plant participating unit |
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