CN111756055A - Control method and system for primary frequency modulation of thermal power generating unit - Google Patents
Control method and system for primary frequency modulation of thermal power generating unit Download PDFInfo
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Abstract
The application relates to a control method and a system for primary frequency modulation of a thermal power generating unit, wherein when the system generates small frequency disturbance, primary frequency modulation is carried out by taking a power grid frequency difference as input; when the system generates large frequency disturbance, primary frequency modulation is carried out by taking the frequency difference change rate of the power grid as input. The invention can realize the differential control of small frequency disturbance and large frequency disturbance without waiting for the process of system frequency reduction, thereby greatly improving the primary frequency modulation regulation speed of the thermal power generating unit and improving the system frequency. The problem of among the prior art because thermal power unit's power regulation speed is very fast, can not discern the fall depth that obtains system frequency as early as, carry out the frequency modulation effect again after waiting for system frequency to descend, be unfavorable for system frequency recovery is solved.
Description
Technical Field
The application belongs to the technical field of primary frequency modulation of power grids, and particularly relates to a control method and system for primary frequency modulation of a thermal power generating unit.
Background
The primary frequency modulation is a function that when the frequency of the power grid exceeds a specified normal range, the change of the frequency of the power grid enables the speed regulating systems of all units participating in the primary frequency modulation in the power grid to automatically increase or decrease the power of the units according to the change of the frequency of the power grid, so that new balance is achieved, and the change of the frequency of the power grid is limited within a certain range. The primary frequency modulation function is an important means for maintaining the stability of the power grid.
The thermal power generating unit is a main power supply in China, particularly a receiving end power grid in the east part, a large number of thermal power generating units are connected, many hydropower and thermal power in the west part are also connected through direct current, when bipolar locking occurs to direct current, the thermal power generating unit is required to rapidly increase output power greatly, the recovery of system frequency can be greatly accelerated, and load shedding can be reduced. If the power of the thermal power generating unit is rapidly increased when the direct current has a blocking fault, the existing primary frequency modulation using frequency as feedback is not enough, and the time of about 5-10s is needed for reducing the system frequency to the minimum value when the frequency is greatly disturbed because the inertia of the power grid is large, as shown in fig. 1. This characteristic will cause the primary frequency modulation capability of the thermal power generating unit to increase gradually along with the frequency dropping process of the system, as shown in fig. 2. Because the power regulation speed of the thermal power generating unit 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 technology is needed to realize a control technology for primary frequency modulation of a thermal power generating unit, which distinguishes small disturbance from large disturbance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem of among the prior art because thermal power unit's power regulation speed is very fast, can not discern the fall depth that obtains system frequency as early as, carry out the frequency modulation effect again after waiting for system frequency to descend, be unfavorable for system frequency recovery is solved.
In order to solve the technical problems, the invention provides a control method and a system for primary frequency modulation of a thermal power generating unit, which can realize the differential control of small frequency disturbance and large frequency disturbance, and when the system generates small frequency disturbance, the primary frequency modulation is carried out by taking the frequency difference of a power grid as input; when the system generates large frequency disturbance, primary frequency modulation is carried out by taking the frequency difference change rate of the power grid as input, the process of waiting for the system frequency reduction is not needed, the primary frequency modulation adjusting speed of the thermal power generating unit is greatly improved, and the system frequency is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a method for controlling primary frequency modulation of a thermal power generating unit, which comprises the following steps:
when disturbance occurs in the power grid where the thermal power generating unit is located, calculating the corresponding power grid frequency change rate after the power grid where the thermal power generating unit is located reaches preset disturbance time;
when the collected real-time power grid frequency is smaller than a preset large disturbance frequency modulation dead zone or the power grid frequency change rate is smaller than a preset large disturbance frequency change rate, performing small disturbance frequency modulation control by taking the power grid frequency difference as input;
when the collected real-time power grid frequency is larger than a preset large-disturbance frequency modulation dead zone and the power grid frequency change rate is larger than a preset large-disturbance frequency change rate, large-disturbance primary frequency modulation power is issued, the power grid frequency difference change rate is used as input to carry out large-disturbance frequency modulation control, and when the power grid frequency is restored to be smaller than the preset large-disturbance frequency modulation dead zone, small-disturbance frequency modulation control is switched.
The second aspect of the present invention provides a control system for primary frequency modulation of a thermal power generating unit, including:
the data acquisition module is used for calculating the corresponding power grid frequency change rate after the power grid where the thermal power generating unit is located reaches the preset disturbance time when disturbance occurs inside the power grid where the thermal power generating unit is located;
the small disturbance frequency modulation control module is used for performing small disturbance frequency modulation control by taking the power grid frequency difference as input when the acquired real-time power grid frequency is smaller than a preset large disturbance frequency modulation dead zone or the power grid frequency change rate is smaller than a preset large disturbance frequency change rate;
and the large disturbance frequency modulation control module is used for issuing large disturbance primary frequency modulation power when the collected real-time power grid frequency is greater than a preset large disturbance frequency modulation dead zone and the power grid frequency change rate is greater than a preset large disturbance frequency modulation change rate, and switching to small disturbance frequency modulation control until the power grid frequency is restored to be less than the preset large disturbance frequency modulation dead zone by taking the power grid frequency difference change rate as input.
The invention has the beneficial effects that: 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 power grid is exerted in advance without waiting for the process of the actual frequency reduction of the power grid, the recovery of the system frequency is facilitated, the primary frequency modulation regulation speed of the thermal power generating unit is greatly improved, the system frequency is improved, and the stability characteristic of the power grid frequency is improved.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a schematic diagram of frequency difference change of a conventional large power grid;
fig. 2 is a schematic diagram of power adjustment of a conventional primary frequency modulation control strategy;
FIG. 3 is a flow chart of a frequency modulation control method according to an embodiment of the present invention;
fig. 4 is a primary frequency modulation control strategy of a thermal power generating unit according to an embodiment of the present invention;
fig. 5 is a graph comparing the control method of the present invention with the conventional control method.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The embodiment provides a control method for primary frequency modulation of a thermal power generating unit, as shown in fig. 3, including:
s1, when disturbance occurs in the power grid where the thermal power generating unit is located, calculating the power grid frequency change rate of the power grid where the thermal power generating unit is located after the preset disturbance time is exceeded;
s2, when the collected real-time power grid frequency is smaller than a preset large disturbance frequency modulation dead zone or the power grid frequency change rate is smaller than a preset large disturbance frequency change rate, performing small disturbance frequency modulation control by taking the power grid frequency difference as input;
and S3, when the collected real-time power grid frequency is greater than a preset large disturbance frequency modulation dead zone and the power grid frequency change rate is greater than a preset large disturbance frequency change rate, issuing large disturbance primary frequency modulation power, and performing large disturbance frequency modulation control by taking the power grid frequency difference change rate as input until the power grid frequency is restored to be less than the preset large disturbance frequency modulation dead zone, and switching to small disturbance frequency modulation control.
The control method can realize the control of primary frequency modulation of the thermal power generating unit for distinguishing small disturbance and large disturbance, wherein the small disturbance is the disturbance caused by normal fluctuation of load, power and current control, adjustment of a tap of a transformer and natural fluctuation of power of a connecting line; large disturbances, which refer to disturbances caused by short circuits of system components, switching operations, and other large power or impedance changes.
As shown in fig. 4, in this embodiment, a large-disturbance frequency modulation dead zone and a frequency change rate determination function are added to a primary frequency modulation control logic of a thermal power generating unit, so as to implement differential control of small frequency disturbance and large frequency disturbance. If the frequency deviation and the frequency change rate are simultaneously met, outputting large-disturbance primary frequency modulation power, switching the primary frequency modulation control strategy to large-frequency disturbance (positive direction/negative direction, and sending a large-disturbance primary frequency modulation power instruction to realize that the maximum frequency modulation capability is exerted without waiting for the system frequency to change to the lowest point.
And after the frequency of the isogrid is restored to be within the large disturbance frequency modulation dead zone, outputting small disturbance primary frequency modulation power, and switching to a small disturbance primary frequency modulation control strategy.
For small-disturbance primary frequency modulation, the output primary frequency modulation power is P ═ Δ f × K, wherein Δ f is a frequency difference signal, K represents a frequency modulation coefficient,
wherein N is0Representing the rated rotating speed of the thermal power generating unit; the rate of change of the rotational speed is indicated,
wherein N ismaxIndicating maximum speed of rotation, N, of thermal power generating unitminAnd the minimum rotating speed of the thermal power generating unit is represented.
For large disturbance primary frequency modulation, the primary frequency modulation power corresponding to the positive frequency modulation dead zone is the positive maximum frequency modulation amount, and the primary frequency modulation power corresponding to the negative frequency modulation dead zone is the negative maximum frequency modulation amount.
In the embodiment, when the frequency of the power grid is small, the frequency difference is used as input to perform primary frequency modulation; when the power grid is subjected to large frequency disturbance, primary frequency modulation is carried out by taking the frequency difference change rate as input, the process of waiting for the reduction of the power grid frequency is not needed, the primary frequency modulation adjusting speed of the thermal power generating unit is greatly increased, and the power grid frequency is improved. Frequency deviation (frequency difference) refers to the difference between the actual value and the nominal value of the system frequency under normal operating conditions of the power system.
In the embodiment, during a large disturbance, the relationship that the frequency modulation power is in direct proportion to the current frequency difference is not adopted any more, once the large disturbance frequency modulation control is triggered, the large disturbance primary frequency modulation power is issued for fast recovery of the power grid frequency, and when the power grid frequency is reduced to be smaller than a preset large disturbance frequency dead zone, the traditional primary frequency modulation control is switched to, namely the frequency modulation power is in direct proportion to the current frequency difference, and the large disturbance frequency modulation control strategy is quitted.
Optionally, the step of calculating the grid frequency change rate of the thermal power generating unit after the grid in which the thermal power generating unit is located exceeds the preset disturbance time in S1 includes:
s11, calculating frequency changes caused by different power unbalance faults borne by a power grid of the thermal power generating unit, and obtaining a frequency change curve;
and S12, acquiring the change rate of the power grid frequency after the preset disturbance time is exceeded according to the frequency change curve.
The preferred preset perturbation time of this embodiment may be 1 s. In the embodiment, for a power grid where a thermal power generating unit is located, a frequency change curve caused by the fact that the power grid bears different power imbalance faults is calculated in advance in an electromechanical transient simulation calculation program, and the frequency change rate of the power grid after disturbance for 1s is calculated.
Table 1 shows the frequency change rate when a disturbance occurs for 1s under the condition that a certain voltage has power shortage with different values, and the frequency change rate is used as the basis for performing primary frequency modulation control according to the frequency change rate.
TABLE 1 calculation of frequency Change Rate of post-disturbance 1s
| Serial number | Power shortage | 1s rate of change of |
| 1 | 2500MW | 0.15Hz/ |
| 2 | 5000MW | 0.3Hz/s |
Optionally, in this embodiment, the preset large disturbance frequency modulation dead zone is 0.1Hz, and the preset large disturbance frequency change rate is greater than 0.1 Hz/s.
According to the method, the frequency variation trend of the power grid under different power shortages is calculated according to the characteristics of the power grid where the thermal power generating unit is located, and accordingly the frequency modulation dead zone of large disturbance and the overrun criterion of the frequency variation rate are determined.
Through calculation, the action criterion for selecting the large disturbance frequency difference in the embodiment is that the frequency modulation dead zone is 0.1Hz, and the frequency change rate is greater than 0.1 Hz/s.
Fig. 5 shows the difference between the control effect of the present invention and the control effect of the conventional primary frequency modulation, and it can be seen from the figure that the output of the thermal power generating unit can be adjusted more quickly by the embodiment of the present invention.
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.
The control method of the embodiment can realize primary frequency modulation control of the thermal power generating unit for distinguishing small disturbance and large disturbance, is compatible with the existing primary frequency modulation control logic, and only needs to expand the frequency control of the large disturbance on the existing primary frequency modulation control logic, so that the practicability is high; the method and the device utilize the advanced index of the frequency change rate, can quickly predict the power disturbance quantity suffered by the power grid, do not need to wait for the descending process of the power grid frequency, can exert the maximum quick frequency modulation capacity of the thermal power generating unit within 2s, and improve the stability characteristic of the power grid frequency.
Example 2:
this embodiment provides a control system of primary control of thermal power generating unit, includes:
the data acquisition module is used for calculating the corresponding power grid frequency change rate after the power grid where the thermal power generating unit is located reaches the preset disturbance time when disturbance occurs inside the power grid where the thermal power generating unit is located;
the small disturbance frequency modulation control module is used for performing small disturbance frequency modulation control by taking the power grid frequency difference as input when the acquired real-time power grid frequency is smaller than a preset large disturbance frequency modulation dead zone or the power grid frequency change rate is smaller than a preset large disturbance frequency change rate;
and the large disturbance frequency modulation control module is used for issuing large disturbance primary frequency modulation power when the collected real-time power grid frequency is greater than a preset large disturbance frequency modulation dead zone and the power grid frequency change rate is greater than a preset large disturbance frequency modulation change rate, and switching to small disturbance frequency modulation control until the power grid frequency is restored to be less than the preset large disturbance frequency modulation dead zone by taking the power grid frequency difference change rate as input.
Optionally, the data obtaining module is further configured to:
calculating frequency change caused by different power unbalance faults borne by a power grid of the thermal power generating unit, and obtaining a frequency change curve;
and acquiring the corresponding power grid frequency change rate after the power grid reaches the preset disturbance time according to the frequency change curve.
Optionally, the large-disturbance frequency modulation control module is further configured to:
and outputting the positive maximum frequency modulation amount or the negative maximum frequency modulation amount of the large-disturbance primary frequency modulation power according to the disturbance direction.
Further, the preset large disturbance frequency modulation dead zone is 0.1Hz, and the preset large disturbance frequency change rate is greater than 0.1 Hz/s.
Please refer to example 1 for a specific implementation of this embodiment.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A control method for primary frequency modulation of a thermal power generating unit is characterized by comprising the following steps:
when disturbance occurs in the power grid where the thermal power generating unit is located, calculating the corresponding power grid frequency change rate after the power grid where the thermal power generating unit is located reaches preset disturbance time;
when the collected real-time power grid frequency is smaller than a preset large disturbance frequency modulation dead zone or the power grid frequency change rate is smaller than a preset large disturbance frequency change rate, performing small disturbance frequency modulation control by taking the power grid frequency difference as input;
when the collected real-time power grid frequency is larger than a preset large-disturbance frequency modulation dead zone and the power grid frequency change rate is larger than a preset large-disturbance frequency change rate, large-disturbance primary frequency modulation power is issued, the power grid frequency difference change rate is used as input to carry out large-disturbance frequency modulation control, and when the power grid frequency is restored to be smaller than the preset large-disturbance frequency modulation dead zone, small-disturbance frequency modulation control is switched.
2. The method for controlling the primary frequency modulation of the thermal power generating unit according to claim 1, wherein the step of calculating the frequency change rate of the power grid in which the thermal power generating unit is located after the preset disturbance time is exceeded comprises:
calculating frequency changes caused by different power unbalance faults borne by an electric power system where the thermal power generating unit is located, and obtaining a frequency change curve;
and acquiring the frequency change rate of the power system after the disturbance exceeds the preset disturbance time according to the frequency change curve.
3. The method for controlling the primary frequency modulation of the thermal power generating unit according to claim 1, further comprising:
when large-disturbance frequency modulation control is carried out, the positive maximum frequency modulation amount or the negative maximum frequency modulation amount of the large-disturbance primary frequency modulation power is issued according to the disturbance direction.
4. The method for controlling the primary frequency modulation of the thermal power generating unit according to claim 1, wherein the preset large-disturbance frequency modulation dead zone is 0.1 Hz.
5. The method for controlling the primary frequency modulation of the thermal power generating unit according to claim 1, wherein the preset large disturbance frequency change rate is greater than 0.1 Hz/s.
6. The utility model provides a control system of thermal power generating unit primary frequency modulation which characterized in that includes:
the data acquisition module is used for calculating the corresponding power grid frequency change rate after the power grid where the thermal power generating unit is located reaches the preset disturbance time when disturbance occurs inside the power grid where the thermal power generating unit is located;
the small disturbance frequency modulation control module is used for performing small disturbance frequency modulation control by taking the power grid frequency difference as input when the acquired real-time power grid frequency is smaller than a preset large disturbance frequency modulation dead zone or the power grid frequency change rate is smaller than a preset large disturbance frequency change rate;
and the large disturbance frequency modulation control module is used for issuing large disturbance primary frequency modulation power when the collected real-time power grid frequency is greater than a preset large disturbance frequency modulation dead zone and the power grid frequency change rate is greater than a preset large disturbance frequency modulation change rate, and switching to small disturbance frequency modulation control until the power grid frequency is restored to be less than the preset large disturbance frequency modulation dead zone by taking the power grid frequency difference change rate as input.
7. The thermal power generating unit primary frequency modulation control system according to claim 6, wherein the data acquisition module is further configured to:
calculating frequency change caused by different power unbalance faults borne by a power grid of the thermal power generating unit, and obtaining a frequency change curve;
and acquiring the corresponding power grid frequency change rate after the power grid reaches the preset disturbance time according to the frequency change curve.
8. The thermal power generating unit primary frequency modulation control system according to claim 6, wherein the large disturbance frequency modulation control module is further configured to:
and outputting the positive maximum frequency modulation amount or the negative maximum frequency modulation amount of the large-disturbance primary frequency modulation power according to the disturbance direction.
9. The method for controlling the primary frequency modulation of the thermal power generating unit according to claim 6, wherein the preset large-disturbance frequency modulation dead zone is +/-0.1 Hz.
10. The method for controlling the primary frequency modulation of the thermal power generating unit according to claim 6, wherein the preset large disturbance frequency change rate is greater than 0.1 Hz/s.
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| CN114899844A (en) * | 2022-06-13 | 2022-08-12 | 华能国际电力股份有限公司德州电厂 | Primary frequency modulation control system of small-disturbance thermal power generating unit |
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| CN111342479A (en) * | 2020-03-04 | 2020-06-26 | 中国电力科学研究院有限公司 | Control method and system for distinguishing small disturbance and large disturbance for primary frequency modulation of gas turbine set |
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| CN111244973A (en) * | 2020-02-13 | 2020-06-05 | 中国电力科学研究院有限公司 | Control method and system for distinguishing small disturbance and large disturbance for primary frequency modulation of new energy |
| CN111293708A (en) * | 2020-02-13 | 2020-06-16 | 中国电力科学研究院有限公司 | Hydroelectric generating set primary frequency modulation control method and system capable of distinguishing small disturbance and large disturbance |
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| CN114899844A (en) * | 2022-06-13 | 2022-08-12 | 华能国际电力股份有限公司德州电厂 | Primary frequency modulation control system of small-disturbance thermal power generating unit |
| WO2023241406A1 (en) * | 2022-06-13 | 2023-12-21 | 华能国际电力股份有限公司德州电厂 | Small-disturbance primary frequency modulation control system for thermal power generating unit |
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Application publication date: 20201009 |