CN111371126A - Method for improving reliability of frequency signal in primary frequency modulation of thermal power generating unit - Google Patents
Method for improving reliability of frequency signal in primary frequency modulation of thermal power generating unit Download PDFInfo
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- CN111371126A CN111371126A CN202010281537.5A CN202010281537A CN111371126A CN 111371126 A CN111371126 A CN 111371126A CN 202010281537 A CN202010281537 A CN 202010281537A CN 111371126 A CN111371126 A CN 111371126A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
A method for improving reliability of a frequency signal in primary frequency modulation of a thermal power generating unit relates to the field of new energy. The invention aims to solve the problem that in the existing method for performing primary frequency modulation adjustment on a thermal power generating unit by using a generator bus frequency signal, the generator bus frequency signal is unreliable, and further the safe operation of the thermal power generating unit is influenced. The method for improving the reliability of the frequency signal in the primary frequency modulation of the thermal power generating unit comprises the steps of multiplying the generator bus frequency signal by 60 and then making a difference with a turbine rotating speed signal, judging whether the absolute value of the difference is larger than a fault threshold value, if so, modifying the current generator bus frequency signal to be 50, and utilizing the modified generator bus frequency signal to perform subsequent primary frequency modulation calculation, and if not, utilizing the current generator bus frequency signal to perform subsequent primary frequency modulation calculation.
Description
Technical Field
The invention belongs to the field of new energy, and particularly relates to a primary frequency modulation technology of a thermal power generating unit.
Background
In recent years, with the increasing of the new energy grid-connected scale, the frequency fluctuation range of a power grid is also increasing due to the obvious random fluctuation characteristic of the generated power of wind power and photovoltaic power generation. The primary frequency modulation function of the thermal power generating unit is that when the power grid frequency changes, the steam turbine regulating system automatically regulates the power of the steam turbine according to the change of the rotating speed, and further the change of the power grid frequency is limited within a certain limit. Along with the increase of the frequency fluctuation range of the power grid, the action frequency of primary frequency modulation of the thermal power generating unit is also obviously increased, and the performance of the primary frequency modulation is also emphasized.
The primary frequency modulation control target of the thermal power generating unit is to ensure the stability of the power grid frequency. At present, when primary frequency modulation of a thermal power generating unit is carried out, power adjustment is carried out according to a rotating speed signal of a steam turbine. Because the steam turbine rotating speed signal and the power grid frequency signal are different in source and always have small deviation, the steam turbine rotating speed signal is usually replaced by the generator bus frequency signal in the primary frequency modulation transformation of the thermal power unit at present, and the generator bus frequency signal is used for primary frequency modulation adjustment of the thermal power unit. However, at the beginning of design, the generator bus frequency signal does not participate in real-time adjustment of the thermal power generating unit, so the generator bus frequency signal is generally measured by a single sensor, and three sensors are not used for centering, so that the generator bus frequency signal is unreliable. Therefore, once the sensor fails, the safe operation of the thermal power generating unit is affected.
Disclosure of Invention
The invention provides a method for improving the reliability of a frequency signal in primary frequency modulation of a thermal power generating unit, aiming at solving the problem that the generator set bus frequency signal is unreliable and further influences the safe operation of the thermal power generating unit in the conventional method for performing primary frequency modulation adjustment on the thermal power generating unit by using a generator bus frequency signal.
A method for improving reliability of a frequency signal in primary frequency modulation of a thermal power generating unit specifically comprises the following steps:
multiplying the generator bus frequency signal by 60 and then making difference with the steam turbine rotating speed signal, judging whether the absolute value of the difference is greater than a fault threshold value,
if yes, the current generator bus frequency signal is modified to be 50, the modified generator bus frequency signal is utilized to carry out subsequent primary frequency modulation calculation,
and if not, performing subsequent primary frequency modulation calculation by using the current generator bus frequency signal.
Further, the method for selecting the fault threshold value comprises the following steps:
in the time period N, the generator bus frequency signal and the turbine rotating speed signal are simultaneously collected once at intervals of t, wherein the collected generator bus frequency signals are all fault-free signals,
multiplying the collected bus frequency signal of each generator by 60, and making difference with the steam turbine rotating speed signal at the same moment,
and selecting the maximum value of the absolute values of all the difference values as a fault threshold value.
Further, the time period N is 1 month, and the interval time t is 1 second.
Further, the modified generator bus frequency signal and the current generator bus frequency signal are both sent to a distributed control system of the thermal power generating unit for subsequent primary frequency modulation calculation.
The method for improving the reliability of the frequency signal in the primary frequency modulation of the thermal power generating unit can improve the reliability of the frequency signal, so that the frequency signal can participate in the primary frequency modulation regulation of the thermal power generating unit.
Drawings
FIG. 1 is a flow chart of a generator bus frequency signal fault detection scheme.
Detailed Description
The first embodiment is as follows: specifically, the present embodiment is described with reference to fig. 1, where the method for improving reliability of a frequency signal in primary frequency modulation of a thermal power generating unit in the present embodiment specifically includes:
designing a frequency signal fault detection scheme:
the generator bus frequency signal and the steam turbine rotating speed signal have only slight deviation and are basically consistent, and the steam turbine rotating speed signal is obtained by three sensors, so that the reliability is high, and the fault detection of the generator bus frequency signal is carried out by utilizing the steam turbine rotating speed signal.
As shown in fig. 1, the generator bus frequency signal is multiplied by 60 to make a difference with the turbine speed signal, and whether the absolute value of the difference is larger than the fault threshold value is judged,
if yes, the current generator bus frequency signal is modified to be 50, the modified generator bus frequency signal is utilized to carry out subsequent primary frequency modulation calculation,
and if not, performing subsequent primary frequency modulation calculation by using the current generator bus frequency signal.
The selection method of the fault threshold value comprises the following steps:
in the time period N, the generator bus frequency signal and the turbine rotating speed signal are simultaneously collected once at intervals of t, wherein the collected generator bus frequency signals are all fault-free signals,
multiplying the collected bus frequency signal of each generator by 60, and making difference with the steam turbine rotating speed signal at the same moment,
and selecting the maximum value of the absolute values of all the difference values as a fault threshold value.
And selecting a fault threshold value, wherein the fault threshold value is determined by the deviation of the generator bus frequency signal and the steam turbine rotating speed signal when the generator bus frequency signal normally operates. In practical application, 1 month data of a generator bus frequency signal and a turbine rotating speed signal are taken, the time interval is 1s, and the generator bus frequency signal is required to have no fault in the time interval. And multiplying the generator bus frequency signal by 60, subtracting the generator bus frequency signal from the steam turbine rotating speed signal at the same moment, and taking the absolute value of the difference to obtain a group of deviation data. The maximum value of the set of deviation data is selected as the fault threshold.
Specifically, the modified generator bus frequency signal and the current generator bus frequency signal are both sent to a distributed control system of the thermal power generating unit for subsequent primary frequency modulation calculation.
After the fault of the generator bus frequency signal is detected, the generator bus frequency signal is forcibly set to be 50, the generator bus frequency signal participates in subsequent primary frequency modulation calculation, the frequency is in a dead zone, primary frequency modulation does not act, and the influence of the fault of the frequency signal on the safe operation of a unit is prevented.
In the embodiment, the generator bus frequency signal after fault diagnosis processing is obtained from the thermal power unit DCS (distributed control system) and the rotating speed signal obtained in the third step, and is sent back to the thermal power unit DCS to participate in subsequent primary frequency modulation calculation.
Claims (4)
1. A method for improving reliability of a frequency signal in primary frequency modulation of a thermal power generating unit is characterized by specifically comprising the following steps:
multiplying the generator bus frequency signal by 60 and then making difference with the steam turbine rotating speed signal, judging whether the absolute value of the difference is greater than a fault threshold value,
if yes, the current generator bus frequency signal is modified to be 50, the modified generator bus frequency signal is utilized to carry out subsequent primary frequency modulation calculation,
and if not, performing subsequent primary frequency modulation calculation by using the current generator bus frequency signal.
2. The method for improving reliability of the frequency signal in the primary frequency modulation of the thermal power generating unit according to claim 1, wherein the fault threshold is selected by a method comprising the following steps:
in the time period N, the generator bus frequency signal and the turbine rotating speed signal are simultaneously collected once at intervals of t, wherein the collected generator bus frequency signals are all fault-free signals,
multiplying the collected bus frequency signal of each generator by 60, and making difference with the steam turbine rotating speed signal at the same moment,
and selecting the maximum value of the absolute values of all the difference values as a fault threshold value.
3. The method for improving reliability of the frequency signal in the primary frequency modulation of the thermal power generating unit according to claim 2, wherein the time period N is 1 month, and the interval time t is 1 second.
4. The method for improving the reliability of the frequency signal in the primary frequency modulation of the thermal power generating unit according to claim 1 or 2, wherein the modified generator bus frequency signal and the current generator bus frequency signal are both sent to a distributed control system of the thermal power generating unit for subsequent primary frequency modulation calculation.
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| CN202010281537.5A CN111371126A (en) | 2020-04-10 | 2020-04-10 | Method for improving reliability of frequency signal in primary frequency modulation of thermal power generating unit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107154635A (en) * | 2017-05-22 | 2017-09-12 | 国电南瑞科技股份有限公司 | A kind of AGC frequency regulation capacity computational methods suitable for frequency modulation service market |
| CN107359624A (en) * | 2017-07-18 | 2017-11-17 | 国网新疆电力公司电力科学研究院 | The method for improving unit primary frequency modulation response precision |
| CN109075572A (en) * | 2016-02-11 | 2018-12-21 | S4能源公司 | Inhibit the system and method for power network frequency deviation |
| CN109784775A (en) * | 2019-02-26 | 2019-05-21 | 国网山东省电力公司莒县供电公司 | A kind of micro-grid system dispatching method and device |
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2020
- 2020-04-10 CN CN202010281537.5A patent/CN111371126A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109075572A (en) * | 2016-02-11 | 2018-12-21 | S4能源公司 | Inhibit the system and method for power network frequency deviation |
| CN107154635A (en) * | 2017-05-22 | 2017-09-12 | 国电南瑞科技股份有限公司 | A kind of AGC frequency regulation capacity computational methods suitable for frequency modulation service market |
| CN107359624A (en) * | 2017-07-18 | 2017-11-17 | 国网新疆电力公司电力科学研究院 | The method for improving unit primary frequency modulation response precision |
| CN109784775A (en) * | 2019-02-26 | 2019-05-21 | 国网山东省电力公司莒县供电公司 | A kind of micro-grid system dispatching method and device |
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