CN111342479A - Control method and system for distinguishing small disturbance and large disturbance for primary frequency modulation of gas turbine set - Google Patents
Control method and system for distinguishing small disturbance and large disturbance for primary frequency modulation of gas turbine set Download PDFInfo
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- CN111342479A CN111342479A CN202010142952.2A CN202010142952A CN111342479A CN 111342479 A CN111342479 A CN 111342479A CN 202010142952 A CN202010142952 A CN 202010142952A CN 111342479 A CN111342479 A CN 111342479A
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a control method and a system for distinguishing small disturbance and large disturbance of primary frequency modulation of a gas turbine set, wherein the method comprises the following steps: acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where a gas turbine set is located; when the frequency input of the system is larger than a preset large disturbance frequency difference dead zone and the frequency change rate is larger than a large disturbance change rate judgment value, outputting large disturbance primary frequency modulation power and carrying out large disturbance frequency modulation control on the system; the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference; and when the frequency input of the system is smaller than a preset large disturbance frequency difference dead zone or the frequency change rate is smaller than a large disturbance change rate judgment value, outputting the common frequency modulation power and performing small disturbance frequency modulation control on the system.
Description
Technical Field
The invention relates to the technical field of power plant electricity, in particular to a control method and a control system for distinguishing small disturbance and large disturbance of primary frequency modulation of a gas turbine set.
Background
The gas turbine set in China is mainly concentrated in the southeast region, a large number of direct-current power supplies are connected to the southeast region, when bipolar locking occurs to direct current, the gas turbine set is often required to rapidly and greatly increase output, the recovery of system frequency can be greatly accelerated, and the load can be cut less. If the power of the gas turbine unit is rapidly increased when the direct current has a blocking fault, the existing primary frequency modulation using frequency as feedback is not enough, because the inertia of the power grid is large, and the time of about 5-10s is needed for reducing the system frequency to the minimum value when the frequency is large and disturbance occurs, as shown in fig. 1. This characteristic will result in a gradual increase in the gas turbine unit primary frequency modulation capability as the system frequency drops, as shown in fig. 2. Because the power regulation speed of the gas turbine set is high, if the falling depth of the system frequency cannot be identified as early as possible, the frequency modulation effect is performed after the system frequency is reduced, and the system frequency recovery is not facilitated.
Therefore, a technique is needed to realize a control technique for distinguishing the primary frequency modulation of the gas turbine set with small disturbance and large disturbance.
Disclosure of Invention
The technical scheme of the invention provides a control method and a control system for distinguishing small disturbance from large disturbance for primary frequency modulation of a gas turbine set, so as to solve the problem of how to control the primary frequency modulation of the gas turbine set by distinguishing the small disturbance from the large disturbance.
In order to solve the above problem, the present invention provides a control method for distinguishing a small disturbance from a large disturbance for primary frequency modulation of a gas turbine set, wherein the method comprises:
acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where a gas turbine set is located;
when the frequency input of the system is larger than a preset large disturbance frequency difference dead zone and the frequency change rate is larger than a large disturbance change rate judgment value, outputting large disturbance primary frequency modulation power and carrying out large disturbance frequency modulation control on the system;
and when the frequency input of the system is smaller than a preset large disturbance frequency difference dead zone or the frequency change rate is smaller than a large disturbance change rate judgment value, outputting the common frequency modulation power and performing small disturbance frequency modulation control on the system.
Preferably, the large disturbance primary frequency modulation power comprises: the primary frequency modulation power is disturbed positively or negatively.
Preferably, when outputting the large disturbance primary frequency modulation power, after performing the system frequency modulation control, the method further includes: and when the system frequency input is smaller than the preset large disturbance frequency difference dead zone, outputting the common frequency modulation power to perform system frequency modulation control.
Preferably, the preset perturbation time is 1S.
Preferably, the large disturbance frequency difference dead zone is 0.1Hz, and the large disturbance change rate judgment value is greater than 0.1 Hz/s; or the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference.
According to another aspect of the present invention, there is provided a control system for distinguishing small disturbance from large disturbance for primary frequency modulation of a gas turbine, the system comprising:
the calculation unit is used for acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where the gas turbine set is located;
the first control unit is used for outputting large-disturbance primary frequency modulation power to perform system large-disturbance frequency modulation control when the system frequency input is larger than a preset large-disturbance frequency difference dead zone and the frequency change rate is larger than a large-disturbance change rate judgment value;
and the second control unit is used for outputting the common frequency modulation power to perform the small-disturbance frequency modulation control on the system when the frequency input of the system is smaller than a preset large-disturbance frequency difference dead zone or the frequency change rate is smaller than a large-disturbance change rate judgment value.
Preferably, the large disturbance primary frequency modulation power comprises: the primary frequency modulation power is disturbed positively or negatively.
Preferably, when outputting the large-disturbance primary frequency modulation power, after performing the system large-disturbance frequency modulation control, the method further includes: and when the frequency input of the system is smaller than the preset large-disturbance frequency difference dead zone, outputting the common frequency modulation power, and performing small-disturbance frequency modulation control on the system.
Preferably, the preset perturbation time is 1S.
Preferably, the large disturbance frequency difference dead zone is 0.1Hz, and the large disturbance change rate judgment value is greater than 0.1 Hz/s; or the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference.
The technical scheme of the invention provides a control method and a system for distinguishing small disturbance and large disturbance for primary frequency modulation of a gas turbine set, wherein the method comprises the following steps: acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where a gas turbine set is located; when the frequency input of the system is larger than a preset large disturbance frequency difference dead zone and the frequency change rate is larger than a large disturbance change rate judgment value, outputting large disturbance primary frequency modulation power and carrying out large disturbance frequency modulation control on the system; and when the frequency input of the system is smaller than a preset large disturbance frequency difference dead zone or the frequency change rate is smaller than a large disturbance change rate judgment value, outputting the common frequency modulation power and performing small disturbance frequency modulation control on the system. The technical scheme of the invention provides a control method for primary frequency modulation of a gas turbine set, which distinguishes small disturbance and large disturbance, and when the system generates frequency small disturbance, primary frequency modulation is carried out by taking frequency difference as input; when the system generates large frequency disturbance, primary frequency modulation is carried out by taking the frequency difference change rate as input, the process of waiting for the system frequency reduction is not needed, the primary frequency modulation adjusting speed of the gas turbine set is greatly increased, and the system frequency is improved. The technical scheme of the invention realizes that the falling depth of the system frequency can be identified as early as possible, the rapid frequency modulation function of the system frequency is exerted in advance without waiting for the system frequency to fall, and the system frequency recovery is facilitated.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a schematic diagram of a frequency difference change of a large power grid according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the power regulation of an existing primary frequency modulation control strategy according to a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a control method for distinguishing a primary frequency modulation of a gas turbine set with small disturbance and large disturbance according to the preferred embodiment of the invention;
FIG. 4 is a gas turbine set primary frequency modulation control strategy with frequency difference and frequency difference change rate as double inputs according to a preferred embodiment of the present invention;
FIG. 5 is a flow chart of a frequency modulation control method according to a preferred embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the calculation results of grid frequency when different power shortages occur in a certain grid according to the preferred embodiment of the present invention;
FIG. 7 is a schematic comparison of the method of the present invention according to a preferred embodiment of the present invention with a conventional test method; and
fig. 8 is a structural diagram of a control system for primary frequency modulation of a gas turbine set for distinguishing small disturbance from large disturbance according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 3 is a flow chart of a control method for distinguishing the primary frequency modulation of the gas turbine set with small disturbance and large disturbance according to the preferred embodiment of the invention. In order to improve the primary frequency modulation regulation speed of the gas turbine unit and improve the system frequency, the application provides a control method for primary frequency modulation of the gas turbine unit, which distinguishes small disturbance and large disturbance, and when the system generates small frequency disturbance, the primary frequency modulation is carried out by taking the frequency difference as input; when the system generates large frequency disturbance, frequency difference change rate is used as input to carry out primary frequency modulation, and a process of waiting for the system frequency to decrease is not needed. As shown in fig. 3, the present application provides a control method for distinguishing a small disturbance from a large disturbance for primary frequency modulation of a gas turbine set, the method includes:
preferably, in step 301: acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where a gas turbine set is located; preferably, the preset perturbation time is 1S. According to the method, for the power grid where the gas turbine set is located, a frequency change calculation curve caused by the fact that the power grid bears different power unbalance faults is calculated in an electromechanical transient simulation calculation program in advance, the frequency change rate of the power grid after disturbance for 1s is calculated, and relevant data are formed and serve as the basis for primary frequency modulation control according to the frequency change rate.
Preferably, at step 302: when the frequency input of the system is larger than the preset large disturbance frequency difference dead zone and the frequency change rate is larger than the large disturbance change rate judgment value, outputting large disturbance primary frequency modulation power, namely outputting the positive/negative maximum frequency modulation quantity, and performing large disturbance frequency modulation control on the system. Preferably, the large perturbation primary frequency modulation power comprises: the primary frequency modulation power is disturbed positively or negatively. Preferably, the large disturbance frequency difference dead zone is 0.1Hz, and the large disturbance change rate judgment value is greater than 0.1 Hz/s. Or the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference.
According to the method, a large-disturbance primary frequency modulation dead zone and a frequency change rate judging function are added to a primary frequency modulation control logic of the gas turbine unit, and as shown in fig. 4, the differential control of small frequency disturbance and large frequency disturbance is realized. Referring to the calculation in step 301, if the frequency deviation is large and the frequency change rate is over-limit, the primary frequency modulation control strategy is switched to the frequency large disturbance (positive direction/negative direction), so that the maximum frequency modulation capability is exerted without waiting for the system frequency to change to the lowest point. According to the method and the device, after the system frequency is recovered to be within the large-disturbance primary frequency modulation dead zone, the system frequency is switched to a normal primary frequency modulation control strategy.
Preferably, in step 303, when the system frequency input is smaller than a predetermined large disturbance frequency difference dead zone, or the frequency change rate is smaller than a large disturbance change rate judgment value, outputting the common frequency modulation power, and performing system small disturbance frequency modulation control, wherein the common frequency modulation power P is Δ f × K.
Preferably, when outputting the large disturbance primary frequency modulation power, after performing the system frequency modulation control, the method further includes: and when the system frequency input is smaller than the preset large disturbance frequency difference dead zone, outputting the common frequency modulation power to perform system frequency modulation control.
The control flow chart provided by the application is shown in fig. 5, and is a calculation result of the frequency change rate of a system under the condition that a certain voltage has power shortage with different values; as shown in fig. 6, the frequency change rate at 1s after the disturbance is calculated, and data shown in table 1 is formed as a basis for performing primary frequency modulation control according to the frequency change rate; through calculation, the action criterion for selecting the large disturbance frequency difference is determined to be that the dead zone is 0.1Hz, and the change rate is more than 0.1 Hz/s; the typical large disturbance frequency difference dead zone can be determined by referring to the frequency difference fluctuation range in the actual steady-state operation process of the power grid, and can be considered to be about 2 times of the steady-state frequency difference. Fig. 7 shows the difference between the control effect of the present invention and the conventional primary frequency modulation control, and it can be seen from the figure that the present application can adjust the output of the gas turbine set more quickly.
TABLE 1 calculation of frequency Change Rate 1s after Fault
| Serial number | Power shortage | 1s rate of change of |
| 1 | 1000MW | 0.05Hz/ |
| 2 | 2000MW | 0.095Hz/s |
| 3 | 3000MW | 0.15Hz/s |
| 4 | 4000MW | 0.205Hz/ |
| 5 | 5000MW | 0.263Hz/s |
The control method for distinguishing the small disturbance from the large disturbance for the primary frequency modulation of the gas turbine set is compatible with the existing primary frequency modulation control logic, the frequency control of the large disturbance is expanded on the existing primary frequency modulation control logic, and the practicability is high; the application utilizes the advanced index of the frequency change rate, can quickly predict the power disturbance quantity suffered by the power grid, does not need to wait for the descending process of the power grid frequency, can exert the maximum quick frequency modulation capacity of the gas turbine unit within 2s, and improves the stability characteristic of the power grid frequency.
The application provides a control method for improving primary frequency modulation of a gas turbine unit with large disturbance frequency modulation performance, which is based on the existing traditional primary frequency modulation control logic, expands the large disturbance dead zone of frequency and the ultralimit criterion of frequency change rate, is used for rapidly judging the frequency disturbance suffered by a power grid, and can rapidly adjust the maximum frequency modulation power of the gas turbine unit without waiting for the actual frequency of the power grid to drop. According to the method and the device, the power grid frequency change trend under different power shortages is calculated according to the characteristics of the power grid where the gas turbine set is located, and accordingly the dead zone of large disturbance and the overrun criterion of the frequency change rate are determined. In the period of large disturbance, the relationship that the frequency modulation power is in direct proportion to the current frequency difference is not adopted, and once a frequency large disturbance criterion is triggered, a maximum frequency modulation power instruction in a corresponding direction is issued for rapidly recovering the power grid frequency. According to the method and the device, after the system frequency is reduced to the large disturbance frequency dead zone, the primary frequency modulation logic is switched back to the unified secondary frequency modulation logic again, namely the frequency modulation power is in direct proportion to the current frequency difference, and exiting of the large disturbance frequency modulation control strategy is achieved.
According to the method and the device, the whole network power can be monitored in real time by adopting a mode of detecting the power shortage of the power grid, and after the power shortage is found to be larger than a certain numerical value, a large-disturbance frequency modulation control signal is issued.
Fig. 8 is a structural diagram of a control system for primary frequency modulation of a gas turbine set for distinguishing small disturbance from large disturbance according to a preferred embodiment of the present invention. As shown in fig. 8, the present application provides a control system for distinguishing a small disturbance from a large disturbance for primary frequency modulation of a gas turbine, the system comprising:
the calculating unit 801 is configured to obtain frequency change rates under different disturbance amounts according to historical fault data of a power grid where the gas turbine set is located. Preferably, the preset perturbation time is 1S. According to the method, for the power grid where the gas turbine set is located, a frequency change calculation curve caused by the fact that the power grid bears different power unbalance faults is calculated in an electromechanical transient simulation calculation program in advance, the frequency change rate of the power grid after disturbance for 1s is calculated, and relevant data are formed and serve as the basis for primary frequency modulation control according to the frequency change rate.
The first control unit 802 is configured to output a large-disturbance primary frequency modulation power, that is, output a maximum positive/negative frequency modulation amount, to perform large-disturbance frequency modulation control on the system, when the system frequency input is greater than a predetermined large-disturbance frequency difference dead zone and the frequency change rate is greater than a large-disturbance change rate determination value. Preferably, the large disturbance frequency difference dead zone is 0.1Hz, and the large disturbance change rate judgment value is greater than 0.1 Hz/s; or the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference. Preferably, the large perturbation primary frequency modulation power comprises: the primary frequency modulation power is disturbed positively or negatively.
According to the method, a large-disturbance primary frequency modulation dead zone and a frequency change rate judging function are added to a primary frequency modulation control logic of the gas turbine unit, and as shown in fig. 4, the differential control of small frequency disturbance and large frequency disturbance is realized. Referring to the calculation in step 301, if the frequency deviation is large and the frequency change rate is over-limit, the primary frequency modulation control strategy is switched to the frequency large disturbance (positive direction/negative direction), so that the maximum frequency modulation capability is exerted without waiting for the system frequency to change to the lowest point. According to the method and the device, after the system frequency is recovered to be within the large-disturbance primary frequency modulation dead zone, the system frequency is switched to a normal primary frequency modulation control strategy.
And the second control unit 803 is configured to output the normal frequency modulation power and perform the system small disturbance frequency modulation control when the system frequency input is smaller than the predetermined large disturbance frequency difference dead zone or the frequency change rate is smaller than the large disturbance change rate determination value.
Preferably, when outputting the large-disturbance primary frequency modulation power, after performing the system large-disturbance frequency modulation control, the method further includes: and when the frequency input of the system is smaller than the preset large-disturbance frequency difference dead zone, outputting the common frequency modulation power, and performing small-disturbance frequency modulation control on the system.
The control flow chart provided by the application is shown in fig. 5, and is a calculation result of the frequency change rate of a system under the condition that a certain voltage has power shortage with different values; as shown in fig. 6, the frequency change rate at 1s after the disturbance is calculated, and data shown in table 1 is formed as a basis for performing primary frequency modulation control according to the frequency change rate; through calculation, the action criterion for selecting the large disturbance frequency difference is determined to be that the dead zone is 0.1Hz, and the change rate is more than 0.1 Hz/s; the typical large disturbance frequency difference dead zone can be determined by referring to the frequency difference fluctuation range in the actual steady-state operation process of the power grid, and can be considered to be about 2 times of the steady-state frequency difference. Fig. 7 shows the difference between the control effect of the present invention and the conventional primary frequency modulation control, and it can be seen from the figure that the present application can adjust the output of the gas turbine set more quickly.
TABLE 1 calculation of frequency Change Rate 1s after Fault
| Serial number | Power shortage | 1s rate of change of |
| 1 | 1000MW | 0.05Hz/ |
| 2 | 2000MW | 0.095Hz/s |
| 3 | 3000MW | 0.15Hz/s |
| 4 | 4000MW | 0.205Hz/ |
| 5 | 5000MW | 0.263Hz/s |
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A control method for distinguishing a small disturbance and a large disturbance for primary frequency modulation of a gas turbine set comprises the following steps:
acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where a gas turbine set is located;
when the frequency input of the system is larger than a preset large disturbance frequency difference dead zone and the frequency change rate is larger than a large disturbance change rate judgment value, outputting large disturbance primary frequency modulation power and carrying out large disturbance frequency modulation control on the system; the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference;
and when the frequency input of the system is smaller than a preset large disturbance frequency difference dead zone or the frequency change rate is smaller than a large disturbance change rate judgment value, outputting the common frequency modulation power and performing small disturbance frequency modulation control on the system.
2. The method of claim 1, the large perturbation chirp power, comprising: the primary frequency modulation power is disturbed positively or negatively.
3. The method according to claim 1, when outputting the large disturbance primary frequency modulation power, and performing the system frequency modulation control, further comprising: and when the system frequency input is smaller than the preset large disturbance frequency difference dead zone, outputting the common frequency modulation power to perform system frequency modulation control.
4. The method of claim 1, the preset perturbation time being 1S.
5. The method of claim 1, wherein the large disturbance frequency difference dead zone is 0.1Hz, and the large disturbance change rate judgment value is greater than 0.1 Hz/s.
6. A control system for differentiating small and large disturbances of gas turbine plant primary frequency modulation, the system comprising:
the calculation unit is used for acquiring frequency change rates under different disturbance quantities according to historical fault data of a power grid where the gas turbine set is located;
the first control unit is used for outputting large-disturbance primary frequency modulation power to perform system large-disturbance frequency modulation control when the system frequency input is larger than a preset large-disturbance frequency difference dead zone and the frequency change rate is larger than a large-disturbance change rate judgment value; the large disturbance frequency difference dead zone is 2 times of the steady state frequency difference;
and the second control unit is used for outputting the common frequency modulation power to perform the small-disturbance frequency modulation control on the system when the frequency input of the system is smaller than a preset large-disturbance frequency difference dead zone or the frequency change rate is smaller than a large-disturbance change rate judgment value.
7. The system of claim 6, the large perturbation chirp power, comprising: the primary frequency modulation power is disturbed positively or negatively.
8. The system of claim 6, when outputting the large-disturbance primary frequency modulation power and performing the system large-disturbance frequency modulation control, further comprising: and when the frequency input of the system is smaller than the preset large-disturbance frequency difference dead zone, outputting the common frequency modulation power, and performing small-disturbance frequency modulation control on the system.
9. The system of claim 6, the preset perturbation time being 1S.
10. The system of claim 6, wherein the large disturbance frequency difference dead zone is 0.1Hz, and the large disturbance change rate judgment value is greater than 0.1 Hz/s.
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| CN113922376A (en) * | 2021-12-15 | 2022-01-11 | 中国电力科学研究院有限公司 | Power system minimum inertia evaluation method and system considering frequency stability constraint |
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Application publication date: 20200626 |