CN115800309A - Primary frequency modulation control method and device without standby fan - Google Patents
Primary frequency modulation control method and device without standby fan Download PDFInfo
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- CN115800309A CN115800309A CN202211408249.7A CN202211408249A CN115800309A CN 115800309 A CN115800309 A CN 115800309A CN 202211408249 A CN202211408249 A CN 202211408249A CN 115800309 A CN115800309 A CN 115800309A
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Abstract
The invention provides a primary frequency modulation control method and a primary frequency modulation control device without a standby fan, wherein the method comprises the following steps: when disturbance occurs on the power grid side, acquiring first required increased power of a fan in a primary frequency modulation mode in real time; when the fan is determined not to meet the amplitude limiting condition and the first requirement increased power does not reach a first preset value based on the first requirement increased power, the fan is controlled to participate in primary frequency modulation based on the first requirement increased power; if the fan does not meet the amplitude limiting condition and the first required increased power reaches a first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met; and if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until the mode switching condition is met. The invention can meet the requirement of increasing power and give full play to the frequency modulation capability of the fan, and effectively reduces the risk that the rotating speed of the rotor cannot be recovered, thereby reducing the risk of secondary power impact.
Description
Technical Field
The invention relates to the technical field of power grid frequency safety, in particular to a primary frequency modulation control method and device without a standby fan.
Background
With the continuous improvement of the permeability of renewable energy sources such as wind power, photovoltaic and the like, a high-capacity direct current project is continuously put into operation, the safety problem of the power grid frequency is obvious, and the primary frequency modulation is carried out by utilizing a fan, so that the method is an effective measure for ensuring the safety problem of the power grid frequency in a new state.
In the process that the fan participates in primary frequency modulation, the total energy output under ideal inertia control is positive, however, the rotor is inevitably decelerated due to the fact that no standby fan adopts inertia control, and secondary falling of the frequency of the power grid side is caused under the condition that the rotating speed of the rotor cannot be recovered, so that the problem of secondary power impact is obvious.
The existing inertia control usually limits the maximum power output by the fan through amplitude limiting, but the amplitude limiting mode can cause that the fan can not fully exert the frequency modulation capability, and the rotating speed of the fan can not be ensured to be recovered, so that the occurrence of secondary power impact can not be avoided.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a primary frequency modulation control method and a primary frequency modulation control device without a spare fan.
The invention provides a primary frequency modulation control method for a spare-free fan, which comprises the following steps:
when disturbance occurs on the power grid side, acquiring first required increased power of a fan in a primary frequency modulation mode in real time;
when the fan is determined to not meet the amplitude limiting condition and the first demand increase power does not reach a first preset value based on the first demand increase power, the fan is controlled to participate in primary frequency modulation based on the first demand increase power;
if the fan does not meet the amplitude limiting condition and the first demand increased power reaches the first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met;
if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
According to the primary frequency modulation control method without the standby fan, the method for determining that the fan does not meet the amplitude limiting condition and the first demand increased power does not reach the first preset value based on the first demand increased power comprises the following steps:
if the first demand increased power meets the preset condition, determining whether the fan meets the amplitude limiting condition or not based on a comparison result of the first demand increased power and the amplitude limiting curve;
and if the first demand increased power does not meet the preset condition, determining whether the first demand increased power reaches the first preset value or not based on a differential result of the first demand increased power.
According to the primary frequency modulation control method without the standby fan, provided by the invention, the amplitude limiting curve is obtained by the following method:
when the power grid side is disturbed, acquiring a simulated power curve of the fan in a critical state based on the initial rotating speed of the fan and the working condition data of the power system;
acquiring a part of the simulated power curve from an initial moment to a target moment, and taking the part as a target curve; the target moment is a moment corresponding to the time when the increased power in the analog power curve reaches a second preset value;
determining the clipping curve based on the target curve; the amplitude limiting curve comprises a first part and a second part, the first part is consistent with the target curve, the increased power of the second part corresponding to each moment is the second preset value, and the connection point of the first part and the second part is the target moment.
According to the primary frequency modulation control method of the non-standby fan, the method for acquiring the simulated power curve of the fan in the critical state based on the initial rotating speed of the fan and the working condition data of the power system comprises the following steps:
determining a critical value of the inertia coefficient corresponding to the initial rotating speed of the fan as a target value of the inertia coefficient based on a preset corresponding relation between the rotating speed of the fan and the critical value of the inertia coefficient;
determining a simulated condition of the power system based on the condition data of the power system;
and determining the simulated power curve based on the target value of the inertia coefficient and the simulated working condition of the power system.
According to the primary frequency modulation control method without the standby fan, the simulation working condition of the power system is determined based on the working condition data of the power system, and the method comprises the following steps:
determining whether the working condition of the power system changes in the primary frequency modulation process based on the working condition data of the power system;
if the working condition of the power system does not change, taking the current working condition of the power system as the simulated working condition of the power system;
and if the working condition of the power system changes, taking the maximum operation mode of the power system as the simulated working condition of the power system.
According to the primary frequency modulation control method without the standby fan, which is provided by the invention, the condition of meeting the mode switching is determined by the following method:
if the distance between the second required increased power of the fan in the preset mode and the first preset value or the increased power corresponding to the limiting curve at the corresponding moment is smaller than or equal to a preset threshold value, determining that the mode switching condition is met; wherein the second demand increased power is determined based on a real-time rotational speed of the wind turbine.
According to the primary frequency modulation control method without the standby fan, after the condition that the mode switching is met is determined, the method further comprises the following steps:
and controlling the fan to switch to the preset mode, and controlling the fan to output power based on the second demand increased power.
The invention also provides a primary frequency modulation control device without a standby fan, which comprises:
the first data processing module is used for acquiring first required increased power of the fan in a primary frequency modulation mode in real time when disturbance occurs on the power grid side;
the second data processing module is used for controlling the fan to participate in primary frequency modulation based on the first demand increase power when the fan is determined not to meet the amplitude limiting condition and the first demand increase power does not reach a first preset value based on the first demand increase power;
the third data processing module is used for controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met if the fan does not meet the amplitude limiting condition and the first required increased power reaches the first preset value;
the fourth data processing module is used for controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met if the fan meets the amplitude limiting condition; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
The invention also provides electronic equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the standby fan-free primary frequency modulation control method is realized.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a backup-fan-less primary frequency modulation control method as described in any of the above.
According to the primary frequency modulation control method and device without the standby fan, when disturbance occurs on the power grid side, the first demand increase power of the fan in the primary frequency modulation mode is obtained in real time, the fan is controlled to participate in primary frequency modulation based on the first demand increase power when the fan does not meet the amplitude limiting condition and the first demand increase power does not reach the first preset value, if the fan does not meet the amplitude limiting condition and the first demand increase power reaches the first preset value, the fan is controlled to participate in primary frequency modulation based on the first preset value until the mode switching condition is met, and if the fan meets the amplitude limiting condition, the fan is controlled to participate in primary frequency modulation based on the amplitude limiting curve until the mode switching condition is met, so that the risk that the rotating speed of a rotor cannot be recovered can be effectively reduced while the demand of the increase power and the frequency modulation capability of the fan are fully exerted, and further the risk of secondary power impact is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a primary frequency modulation control method for a non-backup fan according to the present invention;
FIG. 2 is a power curve diagram of an ideal inertia strategy provided by the present invention;
FIG. 3 is a schematic diagram illustrating the relationship between the critical value of the inertia coefficient and the rotational speed of the fan according to the present invention;
FIG. 4 is a schematic structural diagram of a primary frequency modulation control device without a backup fan according to the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The primary frequency modulation control method without the backup fan according to the present invention is described below with reference to fig. 1 to 3. The primary frequency modulation control method of the non-standby fan is executed by electronic equipment such as a computer or hardware and/or software in the electronic equipment. As shown in fig. 1, the primary frequency modulation control method of the non-backup fan of the present invention at least comprises:
s101, when disturbance occurs on the power grid side, acquiring first required increased power of the fan in a primary frequency modulation mode in real time.
S102, when the fan is determined not to meet the amplitude limiting condition and the first requirement increased power does not reach a first preset value based on the first requirement increased power, the fan is controlled to participate in primary frequency modulation based on the first requirement increased power.
S103, if the fan does not meet the amplitude limiting condition and the first required increased power reaches the first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met.
S104, if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
In this embodiment, the fan is a fan without a backup fan, that is, a fan without backup power, and the power increase that need to be output are obtained from the kinetic energy of the rotor in the process that the fan participates in the primary frequency modulation.
Disturbances occur on the grid side, i.e. fluctuations occur in voltage, current, frequency, power, etc. on the grid side. And a primary frequency modulation mode, namely a working mode when the fan participates in primary frequency modulation. The first required increased power is increased power output by the fan required for suppressing disturbance on the power grid side, the first required increased power at each moment forms a power curve of an ideal inertia strategy, and the power curve of the ideal inertia strategy can be shown in fig. 2. The disturbance of the power grid side changes along with time, so that the first demand increased power of the fan in the primary frequency modulation mode can be obtained in real time, the target increased power of the fan at each moment in the primary frequency modulation process is determined based on the first demand increased power at each moment, and the fan can be controlled to participate in primary frequency modulation according to the target increased power.
The specific mode of acquiring the first demand increased power of the fan in the primary frequency modulation mode can be set according to actual demands, for example, at any time, the first demand increased power at the time can be calculated and obtained based on the value of the inertia coefficient at the time and the frequency variation of the power grid side at the time, and the value of the inertia coefficient at the time can be determined based on the rotating speed of the fan at the time; the frequency change curve of the power grid side and the real-time rotating speed of the fan can also be input into a preset simulation model, and the first demand increased power at each moment is obtained through simulation of the simulation model.
The amplitude limiting condition is a condition that the amplitude of the increased power output by the fan needs to be limited, for example, the amplitude limiting condition may be that the amplitude is larger than a preset power value, that is, the fan meets the amplitude limiting condition when the first required increased power is larger than the preset power value, otherwise, the fan does not meet the amplitude limiting condition; the amplitude limiting condition can also be that the fan exceeds a preset amplitude limiting curve, namely when the first required increased power exceeds a range determined by the preset amplitude limiting curve, the fan meets the amplitude limiting condition, otherwise, the fan does not meet the amplitude limiting condition; the amplitude limiting condition may also be that the first demand increased power exceeds a preset amplitude limiting curve when the first demand increased power meets a preset condition (for example, is greater than 0), that is, the fan meets the amplitude limiting condition when the first demand increased power meets the preset condition and exceeds a range determined by the preset amplitude limiting curve, otherwise, the fan does not meet the amplitude limiting condition.
After determining the first demand increased power, it may be determined whether the fan satisfies the clipping condition based on the first demand increased power at the current time. If the fan does not meet the amplitude limiting condition, whether the first required increased power reaches a first preset value or not can be further determined, the first preset value can be increased power which ensures that the rotating speed of the rotor of the fan can be recovered, and the value of the first preset value can be determined according to the performance requirement of primary frequency modulation and the rotating speed recovery speed requirement of the rotor, for example, the first preset value can be the minimum value of the first required increased power and can also be larger than the minimum value of the first required increased power. If the first demand increase power does not reach the first preset value, the fan is controlled to participate in primary frequency modulation based on the first demand increase power until the first demand increase power reaches the first preset value or the fan meets the amplitude limiting condition so as to meet the increase power demand, so that the frequency modulation capability of the fan can be fully exerted, and the effectiveness of primary frequency modulation is improved. If the fan does not meet the amplitude limiting condition and the first required increased power reaches the first preset value, the fan is continuously controlled to participate in primary frequency modulation based on the first preset value until the mode switching condition is met, namely the condition of exiting the primary frequency modulation mode is met, so that the rotating speed of the rotor can be recovered at the highest speed, and secondary power impact is avoided.
If the fan meets the amplitude limiting condition, the fan enters the amplitude limiting mode in the primary frequency modulation mode, and the fan can be controlled to participate in primary frequency modulation based on a preset amplitude limiting curve until the mode switching condition is met, namely the condition of exiting the primary frequency modulation mode is met. The limiting curve is determined and obtained based on the initial rotating speed of the fan, the initial rotating speed is the rotating speed of the fan when disturbance starts to occur on the side of the power grid, the rotating speed of the fan usually cannot change obviously in a short time, and therefore the risk that the rotating speed of a rotor cannot be recovered can be effectively reduced by controlling the fan to participate in primary frequency modulation based on the preset limiting curve, and further the risk of secondary power impact is reduced.
The amplitude limiting curve is the limit value of the increased power output by the fan at different moments, and can be calculated to obtain the amplitude limiting curve based on the working condition data of the power system and the initial rotating speed of the fan when the power grid side is disturbed, and can also be simulated through a simulation model based on the working condition data of the power system and the initial rotating speed of the fan to obtain the amplitude limiting curve.
In the existing primary frequency modulation process, inertia control usually limits the maximum power output by the fan through amplitude limiting, but the amplitude limiting mode causes that the fan cannot give full play to the frequency modulation capability, and the rotating speed of the fan cannot be guaranteed to be recovered, so that secondary power impact cannot be avoided.
In the embodiment, when disturbance occurs on the power grid side, the first demand increase power of the fan in the primary frequency modulation mode is acquired in real time, and it is determined based on the first demand increase power that the fan does not meet the amplitude limiting condition and the first demand increase power does not reach the first preset value, the fan is controlled to participate in the primary frequency modulation based on the first demand increase power, if the fan does not meet the amplitude limiting condition and the first demand increase power reaches the first preset value, the fan is controlled to participate in the primary frequency modulation based on the first preset value until the mode switching condition is met, if the fan meets the amplitude limiting condition, the fan is controlled to participate in the primary frequency modulation based on the amplitude limiting curve until the mode switching condition is met, so that the risk that the rotating speed of the rotor cannot be recovered can be effectively reduced while the frequency modulation capacity of the fan is fully exerted, and further the risk of secondary power impact is reduced.
In an exemplary embodiment, the determining that the fan does not satisfy the clipping condition and the first demand increased power does not reach a first preset value based on the first demand increased power includes:
if the first demand increased power meets a preset condition, determining whether the fan meets the amplitude limiting condition or not based on a comparison result of the first demand increased power and the amplitude limiting curve;
and if the first demand increased power does not meet the preset condition, determining whether the first demand increased power reaches the first preset value or not based on a differential result of the first demand increased power.
In this embodiment, the preset condition may be determined according to a numerical range of the increased power that affects the recovery of the rotation speed of the rotor, for example, the preset condition may be determined to be satisfied when the value is greater than 0, that is, the first required increased power is greater than 0, and the preset condition may not be satisfied when the value is less than or equal to 0.
When the first demand increased power meets the preset condition, the first demand increased power is further compared with the amplitude limiting curve, and whether the fan meets the amplitude limiting condition is determined according to the comparison result, for example, for any moment, the first demand increased power corresponding to the moment can be compared with the increased power corresponding to the amplitude limiting curve at the moment, if the first demand increased power is larger than the increased power corresponding to the amplitude limiting curve at the moment, the condition that the amplitude limiting condition is met is indicated, and from the moment, the fan is controlled to participate in primary frequency modulation based on the amplitude limiting curve until the mode switching condition is met, otherwise, the condition that the amplitude limiting condition is not met is indicated. When first demand increase power is less than or equal to 0, even first demand increase power surpasss the amplitude limiting curve and can not lead to the fact the influence to the rotational speed recovery of rotor yet, from this, when first demand increase power satisfies preset condition and does not satisfy the amplitude limiting condition, can directly participate in primary control based on first demand increase power control fan to can reduce the decision-making step, improve the real-time of primary control.
When the first demand increased power does not meet the preset condition, it is further determined whether the first demand increased power reaches a first preset value, where the first preset value may be smaller than zero, for example, may be a minimum value of the first demand increased power. That is, when the first demand increased power does not satisfy the preset condition, it is further determined whether the first demand increased power reaches a first preset value. When the first preset value is the minimum value of the first demand increased power, differentiation can be carried out on the first demand increased power at any moment, whether the first demand increased power at the moment reaches the first preset value or not is determined according to the differentiation result, the differentiation result of the first demand increased power is larger than 0 or equal to 0, and when the demand increased power at the previous moment is smaller than 0, the first demand increased power reaches the first preset value, namely the minimum value of the first demand increased power is reached, and then the fan is controlled to participate in primary frequency modulation according to the first preset value, so that the rotating speed of the rotor can be recovered at the fastest speed under the condition of avoiding secondary power impact.
In an exemplary embodiment, the clipping curve is obtained by:
when the power grid side is disturbed, acquiring a simulated power curve of the fan in a critical state based on the initial rotating speed of the fan and working condition data of a power system;
acquiring a part of the simulated power curve from an initial moment to a target moment, and taking the part as a target curve; the target moment is a moment corresponding to the time when the increased power in the analog power curve reaches a second preset value;
determining the clipping curve based on the target curve; the amplitude limiting curve comprises a first part and a second part, the first part is consistent with the target curve, the increased power of the second part corresponding to each moment is the second preset value, and the connection point of the first part and the second part is the target moment.
In this embodiment, the operating condition data of the power system may be data that greatly affects the power increase and generation power output by the fan in the process of participating in the primary frequency modulation in the power system, for example, power supply capacity put into operation in the power system, system topology of the power system, and the like. The critical state may be a state of the motor when the boost power to be output by the motor is minimum, that is, a safest state.
When disturbance occurs on the power grid side, a simulated power curve of the fan in a critical state can be obtained based on the initial rotating speed of the fan and the working condition data of the power system, for example, a critical value of an inertia coefficient can be determined based on the initial wind speed of the fan, a frequency variation of the power grid side at each moment can be determined based on the working condition data of the power system and the initial frequency of the power grid side, a simulated value of the increased power at the corresponding moment can be determined according to a differential result of the critical value of the inertia coefficient and the frequency variation at each moment, and the simulated value of the increased power at each moment forms the simulated power curve. The initial rotating speed of the fan, the working condition data of the power system and the initial frequency of the power grid side can be input into a preset simulation model, so that a simulation power curve can be obtained through simulation of the simulation model. The initial frequency of the grid side is the frequency of the grid side when the grid side starts to generate disturbance.
After the analog power curve is obtained, a clipping curve may be determined based on the analog power curve. For example, a portion of the simulated power curve from the initial time to the target time may be truncated as a target curve, and the clipping curve may be determined based on the target curve. The initial moment is the moment when the disturbance of the power grid side begins to occur; the target moment is a moment when the increased power in the simulated power curve reaches a second preset value, the second preset value can be the increased power which can meet the requirement of the rotor of the fan on the rotational speed restorable under a critical state, and the value of the second preset value can be determined according to the performance requirement of primary frequency modulation and the rotational speed restorable speed requirement of the rotor, for example, the second preset value can be the lowest point of the simulated power curve and can also be larger than the lowest point of the simulated power curve.
The clipping curve may include a first portion and a second portion, the first portion being identical to the target curve, i.e., a curve corresponding from the initial time to the target time is the first portion of the clipping curve; the corresponding curve after the target moment is the second part of the amplitude limiting curve, the power increase corresponding to each moment in the second part is a second preset value, the duration of the second part is not specifically limited, and the second part can be infinitely prolonged, so that the fan is controlled to participate in primary frequency modulation based on the amplitude limiting curve, the power increase requirement can be met, the frequency modulation capability of the fan can be fully exerted, the risk that the rotating speed of the rotor cannot be recovered is effectively reduced, and the risk of secondary power impact is reduced.
In an exemplary embodiment, the obtaining a simulated power curve of the wind turbine in the critical state based on the initial rotation speed of the wind turbine and the operating condition data of the power system includes:
determining a critical value of the inertia coefficient corresponding to the initial rotation speed of the fan as a target value of the inertia coefficient based on a preset corresponding relation between the rotation speed of the fan and the critical value of the inertia coefficient;
determining a simulated condition of the power system based on the condition data of the power system;
and determining the simulated power curve based on the target value of the inertia coefficient and the simulated working condition of the power system.
In this embodiment, under the condition that the system topology of the power system and the fault scenario (e.g., the power shortage scenario) on the power grid side are determined, the critical value of the inertia coefficient (e.g., the upper limit value of the inertia coefficient) changes with the change of the rotation speed of the fan, the correspondence between the rotation speed of the fan and the critical value of the inertia coefficient may be obtained in advance through simulation, and the correspondence may be stored in the form of a graph or a data table, so that when a disturbance occurs on the power grid side, the critical value of the inertia coefficient may be accurately determined in real time according to the initial rotation speed of the fan, so as to update the amplitude limiting curve in real time according to the critical value of the inertia coefficient, thereby ensuring that the amplitude limiting curve matches with the real-time frequency modulation capability of the fan, improving the effectiveness of frequency modulation, and reducing the risk of secondary power impact. The correspondence between the critical value of the inertia coefficient and the rotation speed of the fan may be as shown in fig. 3.
In the process that the fan participates in the primary frequency modulation, the working condition data of the power system are not constant, the simulation working condition of the power system can be determined based on the working condition data of the power system, the simulation working condition can be a limit value of the working condition of the power system, for example, the simulation working condition can be the maximum operation mode of the power system, the reliability of the determination result of the limiting curve is further improved, the process that the fan participates in the primary frequency modulation is controlled according to the limiting curve, the risk that the rotating speed of the rotor cannot be recovered can be effectively reduced, and further the risk of secondary power impact is reduced.
After the target value of the inertia coefficient and the simulated working condition of the power system are determined, a simulated power curve is further determined based on the target value of the inertia coefficient and the simulated working condition of the power system. For example, the frequency variation Δ f of the grid side at each time may be determined based on the simulated condition of the power system and the initial frequency of the grid side, and the target value K of the inertia coefficient i Determining an analog value of the increased transmitting power at the corresponding moment according to the differential result of the frequency variation delta f at each moment, wherein the analog value of the increased transmitting power at each moment forms an analog power curve, and the specific formula is shown as (1):
in the formula, Δ P (t) is an analog value of the increased power at time t, and Δ f (t) is a frequency variation of the grid side at time t.
In an exemplary embodiment, the determining the simulated operating condition of the power system based on the operating condition data of the power system includes:
determining whether the working condition of the power system changes in the primary frequency modulation process based on the working condition data of the power system;
if the working condition of the power system does not change, taking the current working condition of the power system as the simulated working condition of the power system;
and if the working condition of the power system changes, taking the maximum operation mode of the power system as the simulated working condition of the power system.
Specifically, whether the working condition of the power system changes in the primary frequency modulation process can be determined based on the working condition data of the power system, and when the working condition of the power system does not change, for example, the power supply capacity put into operation in the power system remains unchanged in the primary frequency modulation process, the current working condition of the power system can be used as the simulated working condition of the power system, and the current working condition of the power system is the working condition of the power system at the current moment, that is, the working condition of the power system in the primary frequency modulation process. If the working condition of the power system changes, for example, the power supply capacity put into operation in the power system periodically changes in the primary frequency modulation process, the maximum operation mode of the power system can be used as the simulation working condition of the power system, and the maximum operation mode is the working condition with the maximum power supply capacity put into operation, so that the risk that the rotating speed of the rotor cannot be recovered can be reduced to the greatest extent in the process of controlling the fan to participate in the primary frequency modulation based on the limiting curve, and the risk of secondary power impact is reduced.
In an exemplary embodiment, the satisfaction of the mode switching condition is determined by:
if the distance between the second required increased power of the fan in the preset mode and the first preset value or the increased power corresponding to the limiting curve at the corresponding moment is smaller than or equal to a preset threshold value, determining that the mode switching condition is met; wherein the second demand increased power is determined based on a real-time rotational speed of the wind turbine.
Specifically, the preset mode may be an operating mode when the fan does not need to perform primary frequency modulation, for example, the preset mode may be an MPPT (Maximum Power Point Tracking) mode. The second demand increased power is increased power output by the fan required to meet the power demand of the preset mode. In the process that the fan participates in primary frequency modulation, the second demand increased power corresponding to each moment of the fan in the preset mode can be determined based on the real-time rotating speed of the fan, for example, the second demand increased power in the MPPT mode is in direct proportion to the third power of the rotating speed of the fan, and specifically shown in formula (2):
ΔP mppt (t)＝kω 3 (t) (2)
in the formula,. DELTA.P mppt (t) is the second demand increased power at time t, ω (t) is the rotational speed of the fan at time t, and k is the gain coefficient, i.e., the second demand increased power is varied in real time.
In the process of controlling the fan to participate in primary frequency modulation based on the first preset value, if the distance between the second demand increased power and the first preset value is smaller than or equal to a preset threshold value, the mode switching condition is determined to be met, the mode can be switched to the preset mode, and therefore the smoothness of mode switching can be effectively improved.
In the process of controlling the fan to participate in primary frequency modulation based on the amplitude limiting curve, if the distance between the second required increased power and the increased power of the amplitude limiting curve at the corresponding moment is smaller than or equal to a preset threshold, the mode switching condition is determined to be met, the mode can be switched to the preset mode, and therefore the smoothness of mode switching can be effectively improved. Wherein, the increasing power of the clipping curve at the corresponding moment can be a second preset value.
As an optional implementation manner, when the second demand increased power is equal to the first preset value or the second preset value, it may be determined that the mode switching condition is satisfied, so as to ensure the smoothness of the mode switching.
In an exemplary embodiment, after determining that the mode switching condition is satisfied, the method further includes:
and controlling the fan to switch to the preset mode, and controlling the fan to output power based on the second demand increased power.
Specifically, when the mode switching condition is satisfied, the fan may be controlled to switch to the preset mode, for example, the MPPT mode, and the fan may be controlled to output power based on the second demand increased power, so that the fan can be smoothly switched from the primary frequency modulation mode to the preset mode, and frequency fluctuation on the grid side is further reduced.
The following describes the primary frequency modulation control device without the spare fan according to the present invention, and the primary frequency modulation control device without the spare fan described below and the primary frequency modulation control method without the spare fan described above may be referred to in correspondence. As shown in fig. 4, the apparatus includes at least:
the first data processing module 401 is configured to obtain a first required increased power of the fan in a primary frequency modulation mode in real time when a disturbance occurs on the power grid side;
a second data processing module 402, configured to, when it is determined that the fan does not satisfy the amplitude limiting condition and the first demand increased power does not reach a first preset value based on the first demand increased power, control the fan to participate in primary frequency modulation based on the first demand increased power;
a third data processing module 403, configured to, if the fan does not meet the amplitude limiting condition and the first required increased power reaches the first preset value, control the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met;
a fourth data processing module 404, configured to, if the fan meets the amplitude limiting condition, control the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
In an exemplary embodiment, the second data processing module 402 is specifically configured to:
if the first demand increased power meets a preset condition, determining whether the fan meets the amplitude limiting condition or not based on a comparison result of the first demand increased power and the amplitude limiting curve;
and if the first demand increased power does not meet the preset condition, determining whether the first demand increased power reaches the first preset value or not based on a differential result of the first demand increased power.
In an exemplary embodiment, the system further comprises a fifth data processing module, wherein the fifth data processing module is configured to:
when the power grid side is disturbed, acquiring a simulated power curve of the fan in a critical state based on the initial rotating speed of the fan and working condition data of a power system;
acquiring a part of the simulated power curve from an initial moment to a target moment, and taking the part as a target curve; the target moment is a moment corresponding to the time when the increased power in the analog power curve reaches a second preset value;
determining the clipping curve based on the target curve; the amplitude limiting curve comprises a first part and a second part, the first part is consistent with the target curve, the increased power of the second part corresponding to each moment is the second preset value, and the connection point of the first part and the second part is the target moment.
In an exemplary embodiment, the fifth data processing module is specifically configured to:
determining a critical value of the inertia coefficient corresponding to the initial rotating speed of the fan as a target value of the inertia coefficient based on a preset corresponding relation between the rotating speed of the fan and the critical value of the inertia coefficient;
determining a simulated condition of the power system based on the condition data of the power system;
and determining the simulated power curve based on the target value of the inertia coefficient and the simulated working condition of the power system.
In an exemplary embodiment, the fifth data processing module is specifically configured to:
determining whether the working condition of the power system changes in the primary frequency modulation process based on the working condition data of the power system;
if the working condition of the power system does not change, taking the current working condition of the power system as the simulated working condition of the power system;
and if the working condition of the power system changes, taking the maximum operation mode of the power system as the simulated working condition of the power system.
In an exemplary embodiment, the system further comprises a sixth data processing module, wherein the sixth data processing module is configured to:
if the distance between the second required increased power of the fan in the preset mode and the first preset value or the increased power corresponding to the limiting curve at the corresponding moment is smaller than or equal to a preset threshold value, determining that the mode switching condition is met; wherein the second demand increased power is determined based on a real-time rotational speed of the wind turbine.
In an exemplary embodiment, the sixth data processing module is further configured to:
and controlling the fan to switch to the preset mode, and controlling the fan to output power based on the second demand increased power.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor) 501, a communication Interface (Communications Interface) 502, a memory (memory) 503, and a communication bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the communication bus 504. Processor 501 may call logic instructions in memory 503 to perform a no backup fan primary control method comprising: when disturbance occurs on the power grid side, acquiring first required increased power of a fan in a primary frequency modulation mode in real time;
when the fan is determined to not meet the amplitude limiting condition and the first demand increase power does not reach a first preset value based on the first demand increase power, the fan is controlled to participate in primary frequency modulation based on the first demand increase power;
if the fan does not meet the amplitude limiting condition and the first demand increased power reaches the first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met;
if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
In addition, the logic instructions in the memory 503 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention further provides a computer program product, the computer program product includes a computer program, the computer program can be stored on a non-transitory computer readable storage medium, when the computer program is executed by a processor, a computer can execute the backup-fan-less primary frequency modulation control method provided by the above methods, and the method includes: when disturbance occurs on the power grid side, acquiring first required increased power of a fan in a primary frequency modulation mode in real time;
when the fan is determined to not meet the amplitude limiting condition and the first demand increase power does not reach a first preset value based on the first demand increase power, the fan is controlled to participate in primary frequency modulation based on the first demand increase power;
if the fan does not meet the amplitude limiting condition and the first demand increased power reaches the first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met;
if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the method for primary frequency modulation control without a backup fan provided by the above methods, the method including: when disturbance occurs on the power grid side, acquiring first required increased power of a fan in a primary frequency modulation mode in real time;
when the fan is determined not to meet the amplitude limiting condition and the first requirement increasing power does not reach a first preset value based on the first requirement increasing power, the fan is controlled to participate in primary frequency modulation based on the first requirement increasing power;
if the fan does not meet the amplitude limiting condition and the first demand increased power reaches the first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met;
if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A primary frequency modulation control method of a non-standby fan is characterized by comprising the following steps:
when disturbance occurs on the power grid side, acquiring first required increased power of a fan in a primary frequency modulation mode in real time;
when the fan is determined to not meet the amplitude limiting condition and the first demand increase power does not reach a first preset value based on the first demand increase power, the fan is controlled to participate in primary frequency modulation based on the first demand increase power;
if the fan does not meet the amplitude limiting condition and the first demand increased power reaches the first preset value, controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met;
if the fan meets the amplitude limiting condition, controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until the mode switching condition is met; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
2. The primary frequency modulation control method without the standby fan according to claim 1, wherein the determining that the fan does not satisfy the limiting condition and the first required increased power does not reach a first preset value based on the first required increased power comprises:
if the first demand increased power meets the preset condition, determining whether the fan meets the amplitude limiting condition or not based on a comparison result of the first demand increased power and the amplitude limiting curve;
and if the first demand increased power does not meet the preset condition, determining whether the first demand increased power reaches the first preset value or not based on a differential result of the first demand increased power.
3. The primary frequency modulation control method without the standby fan according to claim 1, wherein the amplitude limiting curve is obtained by the following method:
when the power grid side is disturbed, acquiring a simulated power curve of the fan in a critical state based on the initial rotating speed of the fan and the working condition data of the power system;
acquiring a part of the simulated power curve from an initial moment to a target moment, and taking the part as a target curve; the target moment is a moment corresponding to the moment when the increased power in the analog power curve reaches a second preset value;
determining the clipping curve based on the target curve; the amplitude limiting curve comprises a first part and a second part, the first part is consistent with the target curve, the increased power of the second part corresponding to each moment is the second preset value, and the connection point of the first part and the second part is the target moment.
4. The primary frequency modulation control method without the backup fan according to claim 3, wherein the obtaining of the simulated power curve of the fan in the critical state based on the initial rotation speed of the fan and the operating condition data of the power system comprises:
determining a critical value of the inertia coefficient corresponding to the initial rotating speed of the fan as a target value of the inertia coefficient based on a preset corresponding relation between the rotating speed of the fan and the critical value of the inertia coefficient;
determining a simulated condition of the power system based on the condition data of the power system;
and determining the simulated power curve based on the target value of the inertia coefficient and the simulated working condition of the power system.
5. The primary frequency modulation control method without the backup fan according to claim 4, wherein the determining the simulated operating condition of the power system based on the operating condition data of the power system comprises:
determining whether the working condition of the power system changes in the primary frequency modulation process based on the working condition data of the power system;
if the working condition of the power system does not change, taking the current working condition of the power system as the simulated working condition of the power system;
and if the working condition of the power system changes, taking the maximum operation mode of the power system as the simulated working condition of the power system.
6. The primary frequency modulation control method without a backup fan according to any one of claims 1 to 5, wherein the satisfaction of the mode switching condition is determined by:
if the distance between the second required increased power of the fan in the preset mode and the first preset value or the increased power corresponding to the limiting curve at the corresponding moment is smaller than or equal to a preset threshold value, determining that the mode switching condition is met; wherein the second demand increased power is determined based on a real-time rotational speed of the wind turbine.
7. The primary frequency modulation control method without the backup fan according to claim 6, after determining that the mode switching condition is satisfied, further comprising:
and controlling the fan to switch to the preset mode, and controlling the fan to output power based on the second demand increased power.
8. The utility model provides a no standby fan primary control device, its characterized in that includes:
the first data processing module is used for acquiring first required increased power of the fan in a primary frequency modulation mode in real time when disturbance occurs on the power grid side;
the second data processing module is used for controlling the fan to participate in primary frequency modulation based on the first demand increase power when the fan is determined not to meet the amplitude limiting condition and the first demand increase power does not reach a first preset value based on the first demand increase power;
the third data processing module is used for controlling the fan to participate in primary frequency modulation based on the first preset value until the mode switching condition is met if the fan does not meet the amplitude limiting condition and the first required increased power reaches the first preset value;
the fourth data processing module is used for controlling the fan to participate in primary frequency modulation based on a preset amplitude limiting curve until a mode switching condition is met if the fan meets the amplitude limiting condition; and when the power grid side is disturbed, the amplitude limiting curve is determined and obtained based on the initial rotating speed of the fan.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the backup-less fan primary control method according to any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the backup-less fan primary control method according to any of claims 1 to 7.
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| CN202211408249.7A CN115800309A (en) | 2022-11-10 | 2022-11-10 | Primary frequency modulation control method and device without standby fan |
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| CN202211408249.7A CN115800309A (en) | 2022-11-10 | 2022-11-10 | Primary frequency modulation control method and device without standby fan |
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| CN202211408249.7A Pending CN115800309A (en) | 2022-11-10 | 2022-11-10 | Primary frequency modulation control method and device without standby fan |
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