CN117108444A - Control method and system for additional inertia of doubly-fed fan based on inertia demand - Google Patents
Control method and system for additional inertia of doubly-fed fan based on inertia demand Download PDFInfo
- Publication number
- CN117108444A CN117108444A CN202310744136.2A CN202310744136A CN117108444A CN 117108444 A CN117108444 A CN 117108444A CN 202310744136 A CN202310744136 A CN 202310744136A CN 117108444 A CN117108444 A CN 117108444A
- Authority
- CN
- China
- Prior art keywords
- fan
- inertia
- doubly
- fed
- additional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000004044 response Effects 0.000 claims abstract description 40
- 230000008859 change Effects 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims description 16
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0276—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/028—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The application discloses a control method and a system for additional inertia of a doubly-fed wind turbine based on inertia demand, which belong to the technical field of inertia control of a new energy high-permeability electric power system, and comprise the steps of obtaining the rotating speed change demand of a wind turbine rotor of the doubly-fed wind turbine according to the wind turbine inertia demand of the doubly-fed wind turbine; based on the rotation speed change demand, the additional inertia of the doubly-fed fan is controlled by adding a first-order inertia link after the inertia response time of the doubly-fed fan and setting the time constant of the first-order inertia link; the method is used for avoiding the phenomenon that the doubly-fed fan is subjected to power back-suction in the frequency recovery period and the phenomenon that the fan output power is subjected to secondary drop when the inertial response is finished. The application meets the inertia requirement of the fan and solves the problem of low inertia of the system.
Description
Technical Field
The application relates to the technical field of inertia control of new energy high-permeability power systems, in particular to a control method and a system for additional inertia of a doubly-fed fan based on inertia demand.
Background
The system lacking inertia is difficult to restrain the frequency change speed, and the operation safety of the system cannot be ensured under large disturbance; moreover, although the inertia surplus system can ensure that the frequency change rate meets the safety regulations, the recovery phase of the frequency is prolonged, which is not beneficial to the recovery of the system frequency. In addition, although the traditional virtual inertia control of the current mainstream can enable the fan to provide effective inertia support in time when the system is subject to fluctuation, high-frequency signals are easy to generate, so that the fluctuation of the system frequency is large, and if the control is not closed in time in the frequency recovery period, the system frequency can be seriously overshoot due to the phenomenon of fan power absorption. Therefore, there is an urgent need to design a doubly-fed fan variable coefficient additional frequency control technology based on inertia response time, so as to solve the above technical problems.
Disclosure of Invention
In order to solve the problems, the application aims to provide a doubly-fed fan variable coefficient additional frequency control technology based on inertia response time, which solves the problem of power back-suction by always setting an additional power signal at a positive value in the frequency modulation process and meets the requirement of inertia of a system by parameter setting.
In order to achieve the technical purpose, the application provides a control method of additional inertia of a doubly-fed fan based on inertia demand, which comprises the following steps:
acquiring the rotating speed change demand of a fan rotor of the doubly-fed fan according to the fan inertia demand of the doubly-fed fan;
based on the rotation speed change demand, the additional inertia of the doubly-fed fan is controlled by adding a first-order inertia link after the inertia response time of the doubly-fed fan and setting the time constant of the first-order inertia link.
Preferably, in the process of obtaining the fan inertia requirement, obtaining the fan inertia requirement based on a fan virtual inertia time constant of the doubly-fed fan, wherein the fan virtual inertia time constant is expressed as:
wherein H is vir The virtual inertia time constant is the fan; s is S BW The rated capacity of the fan; h w Is the inherent inertia time constant of the fan; j (J) vir The virtual inertia of the fan; j (J) w Is the inherent inertia of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r0 The initial rotating speed of the fan rotor is set; omega r Is the angular velocity of the fan rotor; omega e Is the synchronous angular velocity; Δω e To synchronize the angular velocity variation.
Preferably, in the process of obtaining the variable coefficient, obtaining the fan output electromagnetic power of the doubly-fed fan in the maximum power tracking area based on the rotation speed change demand;
based on the output electromagnetic power of the fan, acquiring the first fan supporting power when disturbance occurs according to a rotor motion equation of the doubly-fed fan;
based on the first fan support power, a first-order inertia link is additionally arranged after the inertia response time of the doubly-fed fan is finished, and a variable additional frequency control coefficient is obtained to serve as a variable coefficient, wherein inertia compensation is carried out on the doubly-fed fan through the variable coefficient, and the variable coefficient is used for avoiding a power back-suction phenomenon occurring in a frequency recovery period and a secondary drop phenomenon of fan output power when the inertia response is finished.
Preferably, in the process of acquiring the fan output electromagnetic power of the maximum power tracking area, the fan output electromagnetic power is expressed as:
wherein P is e Outputting electromagnetic power for the fan; k (k) opt The optimal power curve proportionality coefficient of the fan; omega r Is the angular velocity of the fan rotor.
Preferably, in the process of acquiring the rotor motion equation, the rotor motion equation is expressed as:
wherein DeltaP w Supporting power for the first fan; k is an additional inertia control coefficient of the fan; h w Is the inherent inertia time constant of the fan.
Preferably, in the process of acquiring the fan additional inertia control coefficient, the fan additional inertia control coefficient is expressed as:
wherein K is 1 An initial additional inertia control coefficient of the fan at the disturbance moment; t (T) d And e is a first-order inertial link time constant, and e represents a natural base number.
Preferably, in the process of obtaining the initial additional inertia control coefficient of the fan at the disturbance moment, the initial additional inertia control coefficient of the fan at the disturbance moment is expressed as:
wherein omega r0 For the initial rotation speed of the fan rotor, t h Expressed as the system inertial response time.
Preferably, in the process of setting the time constant of the first-order inertia link, the second fan supporting power of the doubly-fed fan based on the initial additional inertia control coefficient is obtained, the inertia response time proportionality coefficient is generated, and the time constant is set by adjusting the inertia response time proportionality coefficient.
Preferably, in acquiring the second fan support power, the second fan support power is expressed as:
wherein K is the inertia response time proportionality coefficient, K t Is a constant; f is a functional relationship, ΔP w1 Representing a given power constraint.
The application discloses a control system of additional inertia of a doubly-fed fan based on inertia demand, which comprises the following components:
the data acquisition module is used for acquiring the fan inertia requirement of the doubly-fed fan;
the data processing module is used for acquiring the rotating speed change demand of the fan rotor of the doubly-fed fan according to the fan inertia demand;
the additional inertia control module is used for controlling the additional inertia of the doubly-fed fan based on the rotation speed change demand by adding a first-order inertia link after the inertia response time of the doubly-fed fan and setting the time constant of the first-order inertia link.
The application discloses the following technical effects:
the application meets the inertia requirement of the fan and solves the problem of low inertia of the system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method according to the present application;
FIG. 2 is a schematic diagram of a variable coefficient additional frequency control structure of a doubly-fed wind turbine according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the evaluation result of the rotational speed variation demand according to the present application;
FIG. 4 is a simulated topology of a wind farm according to the present application;
FIG. 5 is a graph of the system frequency response during a sudden load disturbance increase in a simulation example in accordance with the present application;
FIG. 6 is a graph of fan speed change during sudden load disturbance in a simulation example according to the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
1-6, the doubly-fed fan variable coefficient additional frequency control technology based on inertia response time firstly obtains the fan rotor rotating speed change demand according to the fan inertia demand; secondly, designing an additional inertia control method based on a delay link to obtain an additional frequency control coefficient which is variable in inertia response time; then, a first-order inertia link is designed, a first-order inertia link time constant is determined, and the system frequency is ensured not to be influenced by the fan support power in the recovery period.
The application provides a doubly-fed fan variable coefficient additional frequency control technology based on inertia response time, which specifically comprises the following steps:
FIG. 1 is a flowchart of an additional inertia control method based on fan inertia demand according to an embodiment of the present application, as shown in FIG. 1, including the following steps:
step 1: obtaining the rotating speed change demand of the fan rotor according to the inertia demand of the fan;
step 2: designing an additional inertia control method based on a delay link to obtain an additional frequency control coefficient which is variable in inertia response time;
step 3: and designing a first-order inertia link, determining a time constant of the first-order inertia link, and ensuring that the system frequency is not influenced by the fan support power in the recovery period.
FIG. 2 is a block diagram of a method for controlling variable coefficient additional frequency of a doubly-fed wind turbine based on inertia response time according to an embodiment of the present application. The problem of low inertia level exists in the wind power high-permeability regional power grid, so that virtual inertia control is additionally arranged on the fan, and the simulation synchronous machine can provide effective inertial support for the system during disturbance.
Referring to definition of inertial time constant of synchronous machine, virtual inertial time constant H of fan vir Can be expressed as:
wherein H is vir The virtual inertia time constant is the fan; s is S BW The rated capacity of the fan; h w Is the inherent inertia time constant of the fan; j (J) vir The virtual inertia of the fan; j (J) w Is the inherent inertia of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r0 The initial rotating speed of the fan rotor is set; omega r Is the angular velocity of the fan rotor; omega e Is the synchronous angular velocity; Δω e To synchronize the angular velocity variation.
Synchronizing rotational speed omega in per unit system e Rated capacity S of fan BW All approximate 1, therefore, from the above formula, the virtual inertia time constant H of the fan vir Can more accurately reflect the magnitude J of virtual inertia vir Therefore, the virtual inertia control parameters of the fan are reasonably set to enable the rotating speed variation of the fan to reach an expected value, and further the virtual inertia time constant of the fan meets the requirement, so that the inertia requirement of the fan is met.
FIG. 3 is a graph showing the result of evaluation of the rotational speed variation demand based on the fan inertia demand in the embodiment of the present application, wherein the frequency deviation of the national grid regulated power system under normal conditions must not exceed 0.5Hz, when H w Fixed for 4s, if H vir ＝6s，ω r0 When=0.8 pu, Δω can be obtained according to fig. 3 r ＝0.019pu。
The angular speed of the fan rotor can be 0.7-1.2 pu, the variation in frequency modulation is larger than that of synchronous angular speed, so that the virtual inertia time constant of the fan is far larger than H w . After obtaining the inertia requirement of the fan, combining the fan and the running state of the system to obtain omega r0 、Δω e 、ω e The expected rotating speed variation of the fan can be obtained according to the formula (1).
The traditional differential inertia control can generate a power back-suction phenomenon in a frequency recovery period, is unfavorable for the recovery of the system frequency in a frequency modulation period, and even can generate larger overshoot. Therefore, the application provides new additional inertia control to meet the requirement of fan inertia based on the deficiency of the traditional control.
The output electromagnetic power of the fan can be divided into a maximum power tracking area and a constant power area according to the rotating speed of the rotor, wherein the power of the fan in the maximum power tracking area can be expressed as:
wherein P is e Outputting electromagnetic power for the fan; k (k) opt The optimal power curve proportionality coefficient of the fan; omega r Is the angular velocity of the fan rotor.
The control strategy provided by the application refers to an electromagnetic power expression of the fan, taking load sudden increase as an example, an active ring of the fan is added with a power supporting signal at the disturbance occurrence moment, the fan rotor releases part of rotational kinetic energy to be used for supporting system frequency, and at the moment, a rotor motion equation of the fan can be expressed as follows:
wherein DeltaP w Supporting power for the fan; k is an additional inertia control coefficient of the fan; omega r Is the angular velocity of the fan rotor; h w Is the inherent inertia time constant of the fan.
If the additional inertia control coefficient K of the fan is a fixed value and the fan exits immediately after the inertial response is finished, the output power of the fan drops instantaneously, and the frequency also has a secondary drop phenomenon; if a first-order inertia link is added at the end of the inertia response time, the supporting power of the fan is smoothly reduced to a smaller value, the exiting action is required to be completed in the frequency recovery period, and otherwise, the system frequency recovery is not facilitated. Therefore, the application provides that the supporting power of the fan is smoothly reduced in the inertia response period by changing the coefficient, and the supporting power in the inertia response period meets the inertia requirement of the fan. The variable coefficient is realized through a first-order inertia link, and the specific operation is as follows:
if the delay link is set on the additional inertia control coefficient K of the fan at the disturbance occurrence time, K can be expressed as:
wherein K is an additional inertia control coefficient of the fan; k (K) 1 An initial additional inertia control coefficient of the fan at the disturbance moment; t (T) d Is a first order inertial link time constant.
Fan support power Δp w The expression may be written as:
wherein K is 1 An initial additional inertia control coefficient of the fan at the disturbance moment; omega r Is the angular velocity of the fan rotor; t (T) d Is a first order inertial link time constant.
Δp in the above w The expression is substituted into a fan rotor motion equation, and two sides of the equation are integrated simultaneously to obtain the following components:
wherein T is d The time constant is the first-order inertia link time constant; h w Is the inherent inertia time constant of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r Is the angular velocity of the fan rotor; omega r0 Is the initial rotation speed of the fan rotor.
From the above, K is obtained 1 The expression of (2) is:
wherein T is d The time constant is the first-order inertia link time constant; h w Is the inherent inertia time constant of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r0 Is the initial rotation speed of the fan rotor.
Under the action of the delay link, the additional inertia coefficient K of the fan is smoothly reduced, and when the inertial response is finished, the rotating speed of the fan reaches an expected value, so that the inertia requirement is met. If the K value decays to a smaller value, ΔP w When the frequency is nearly 0, the fan is regarded as being restored to the maximum power tracking state, and the problem of secondary system frequency drop caused by instantaneous locking of frequency control is solved.
However, the problem of time constant tuning in the first-order inertia link still exists, and it is required to ensure that the fan does not provide inertial support in the frequency recovery stage, and the problem of secondary frequency drop of the system is solved by reasonably designing and controlling parameters.
When the time constant of the first-order inertia link is set to be larger, the fan support power delta P w The fan still has inertia support on the system after the inertia response is finished, so that the recovery of the frequency is hindered; when the setting is smaller, the support power changes faster, which is unfavorable for the frequency adjustment.
Setting ΔP wh ≤ΔP w1 The effect of the support power on the system frequency can be ignored. Under the action of a delay link, when T d ＝t h at/K, K 1 Can be expressed as:
wherein t is h Is the inertial response time of the system; h w Is the inherent inertia time constant of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r0 Is the initial rotation speed of the fan rotor.
Will K 1 Substituting the support power DeltaP w In the expression, the supporting power delta P of the fan at the moment of inertia corresponding to the moment of time can be obtained wh This can be expressed as:
wherein H is w Is the inherent inertia time constant of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r0 The initial rotating speed of the fan rotor is set; t is t h Is the inertial response time of the system; k is the inertial response time scaling factor; omega r Is the angular velocity of the fan rotor; k (K) t Is a constant; f is a functional relationship. From the above, K can be known t F (k) is expressed as:
in order to ensure that the fan support power has negligible influence on the system in the frequency recovery period, proper k value is selected and combined with system parameters to ensure that the fan support power is at t h When the estimated value of the supporting power of the fan is smaller than the set value delta P w1 . Combining given power constraints ΔP w1 The k value satisfying the condition can be calculated according to the above expression, and can be expressed as:
wherein f －1 Is an inverse function of f.
The time constant T of the first-order inertia link can be obtained according to the obtained k value d The additional frequency control provided by the application can enable the fan to virtually obtain the expected inertia in the known inertia response time, thereby accurately filling the inertia shortage of the system, smoothly attenuating the supporting power to an ideal value when the inertia response is finished, and solving the defect of the traditional frequency control.
FIG. 4 is a simulated topology of a wind farm in accordance with an embodiment of the application. The embodiment of the application builds a three-machine model in a Matlab/Simulink simulation environment, wherein G1 and G2 are rated capacities of 400MW and 2 respectivelyThe rated capacity of the 00MW synchronous generator, the double-fed fan (DFIG) is 200MW, and the new energy capacity is 25%. The inertia time constant of the synchronous machine is set to be 6s, the initial rotating speed of the fan is 0.802pu, and the inherent inertia time constant H w Setting the total load of the system to be 500MW at 4s, setting the disturbance sudden increase condition of the load at 10s, and the disturbance power delta P L =0.08 pu, the feasibility of the proposed control strategy was verified by comparing the frequency improvement effect with the fan speed variation.
As can be seen from formula (3), the magnitude of the virtual inertial time constant of the blower depends on the inherent inertial time constant H of the blower w Initial rotation speed omega of fan rotor r0 Synchronous angular velocity omega e Δω r And Deltaomega e Ratio of the two components. However, the angular speed of the fan rotor can be 0.7-1.2 pu, and the variation during frequency modulation can be far greater than the variation of synchronous angular speed, so that the virtual inertia time constant H of the fan can fully exert the frequency modulation capability of the fan vir The inertia time constant of the synchronous machine is not lower than that of the synchronous machine, and the inertia requirement of the fan is set to be 6s. The national grid company prescribes that the frequency deviation of the power system under normal conditions cannot exceed 0.5Hz, and delta omega can be taken e =0.5 Hz, and the rotational speed variation Δω based on the fan inertia requirement can be obtained quantitatively according to equation (1) r 0.019pu. Inertial response time t of system h Taking 2.4s, and optimizing the power curve proportionality coefficient k opt ＝1/1.2 3 . From equation (11) we can get K4 and from equation (8) we can get the additional inertia controller parameter K 1 0.41.
FIG. 5 is a graph showing the frequency response of the system during a sudden load disturbance increase in a simulation example according to an embodiment of the present application; FIG. 6 is a graph showing the change in fan speed during sudden load disturbance in a simulation example of an embodiment of the present application. As can be seen from fig. 5 and fig. 6, the frequency drop amplitude of the system is 0.64Hz in the maximum power tracking state, and the frequency drop amplitude of the system is 0.49Hz after the control provided by the application is added, so that the frequency safety regulation requirement of the national power grid is met; the change amount of the rotating speed of the fan after additional control is 0.02pu, and the virtual inertia H of the fan can be obtained according to the formula (1) vir =6.55 s, meets the inertia requirement of the fan, fromAnd the feasibility of the proposed control strategy is verified.
The application meets the inertia requirement of the fan and solves the problem of low inertia of the system. The control method provided by the application can evaluate the initial value of the control coefficient of the additional inertia when the fan meets the virtual inertia requirement, so that the fan has reliable inertial support capacity; and the control coefficient is slowly attenuated through a first-order inertia link until the support power meets the constraint condition at the moment of inertia response time, so that the influence of the fan support power on the system in the frequency recovery period can be ignored.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The control method of the additional inertia of the double-fed fan based on the inertia requirement is characterized by comprising the following steps of:
acquiring the rotating speed change demand of a fan rotor of the doubly-fed fan according to the fan inertia demand of the doubly-fed fan;
based on the rotation speed change demand, the additional inertia of the doubly-fed fan is controlled by adding a first-order inertia link after the inertia response time of the doubly-fed fan and setting the time constant of the first-order inertia link.
2. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 1, wherein the method comprises the following steps:
in the process of acquiring the fan inertia demand, acquiring the fan inertia demand based on a fan virtual inertia time constant of the doubly-fed fan, wherein the fan virtual inertia time constant is expressed as:
wherein H is vir The virtual inertia time constant is the fan; s is S BW The rated capacity of the fan; h w Is the inherent inertia time constant of the fan; j (J) vir The virtual inertia of the fan; j (J) w Is the inherent inertia of the fan; Δω r The angular velocity variation of the fan rotor is used as the angular velocity variation of the fan rotor; omega r0 The initial rotating speed of the fan rotor is set; omega r Is the angular velocity of the fan rotor; omega e Is the synchronous angular velocity; Δω e To synchronize the angular velocity variation.
3. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 2, wherein the method comprises the following steps:
in the process of obtaining the variable coefficient, obtaining the fan output electromagnetic power of the doubly-fed fan in the maximum power tracking area based on the rotating speed change demand;
based on the fan output electromagnetic power, acquiring a first fan support power when disturbance occurs according to a rotor motion equation of the doubly-fed fan;
based on the first fan supporting power, a first-order inertia link is additionally arranged after the inertia response time of the doubly-fed fan is finished, and a variable additional frequency control coefficient is obtained to serve as a variable coefficient, wherein inertia compensation is carried out on the doubly-fed fan through the variable coefficient, and the variable coefficient is used for avoiding a power back-suction phenomenon occurring in a frequency recovery period and a secondary drop phenomenon of fan output power when the inertia response is finished.
4. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 3, wherein the method comprises the following steps:
in the process of acquiring the fan output electromagnetic power of the maximum power tracking area, the fan output electromagnetic power is expressed as:
wherein P is e Outputting electromagnetic power for the fan; k (k) opt The optimal power curve proportionality coefficient of the fan; omega r Is the angular velocity of the fan rotor.
5. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 4, wherein the method comprises the following steps:
in the process of acquiring a rotor motion equation, the rotor motion equation is expressed as:
wherein DeltaP w Supporting power for the first fan; k is an additional inertia control coefficient of the fan; h w Is the inherent inertia time constant of the fan.
6. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 5, wherein the method comprises the following steps:
in the process of acquiring the additional inertia control coefficient of the fan, the additional inertia control coefficient of the fan is expressed as follows:
wherein K is 1 An initial additional inertia control coefficient of the fan at the disturbance moment; t (T) d And e is a first-order inertial link time constant, and e represents a natural base number.
7. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 6, wherein the method comprises the following steps:
in the process of acquiring the initial additional inertia control coefficient of the fan at the disturbance moment, the initial additional inertia control coefficient of the fan at the disturbance moment is expressed as:
wherein omega r0 For the initial rotation speed of the fan rotor, t h Expressed as the system inertial response time.
8. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 7, wherein the method comprises the following steps:
and in the process of setting the time constant of the first-order inertia link, acquiring the second fan supporting power of the doubly-fed fan based on the initial additional inertia control coefficient, generating an inertia response time proportionality coefficient, and adjusting the inertia response time proportionality coefficient to realize the setting of the time constant.
9. The method for controlling the additional inertia of the doubly-fed wind turbine based on the inertia requirement according to claim 8, wherein the method comprises the following steps:
in the process of acquiring the second fan support power, the second fan support power is expressed as:
wherein K is the inertia response time proportionality coefficient, K t Is a constant; f is a functional relationship, ΔP w1 Representing a given power constraint.
10. The utility model provides a control system of double-fed fan additional inertia based on inertia demand which characterized in that includes:
the data acquisition module is used for acquiring the fan inertia requirement of the doubly-fed fan;
the data processing module is used for acquiring the rotating speed change demand of the fan rotor of the doubly-fed fan according to the fan inertia demand;
and the additional inertia control module is used for controlling the additional inertia of the doubly-fed fan based on the rotating speed change demand by adding a first-order inertia link after the inertia response time of the doubly-fed fan and setting the time constant of the first-order inertia link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310744136.2A CN117108444A (en) | 2023-06-21 | 2023-06-21 | Control method and system for additional inertia of doubly-fed fan based on inertia demand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310744136.2A CN117108444A (en) | 2023-06-21 | 2023-06-21 | Control method and system for additional inertia of doubly-fed fan based on inertia demand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117108444A true CN117108444A (en) | 2023-11-24 |
Family
ID=88795468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310744136.2A Pending CN117108444A (en) | 2023-06-21 | 2023-06-21 | Control method and system for additional inertia of doubly-fed fan based on inertia demand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117108444A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591395A (en) * | 2016-01-06 | 2016-05-18 | 清华大学 | Rotating speed recovery method of double-fed induction generator after virtual inertia control |
| CN110594093A (en) * | 2019-08-29 | 2019-12-20 | 湖北工业大学 | Double-fed fan inertia control method based on second-order frequency differential of power system |
| US20210164442A1 (en) * | 2018-08-07 | 2021-06-03 | Università Degli Studi Di Genova | Method and system for controlling non-inertial generators, in particular wind generators, by inertia emulation |
| CN113904346A (en) * | 2021-09-29 | 2022-01-07 | 云南电网有限责任公司电力科学研究院 | Wind turbine generator rotating speed recovery method considering hydroelectric frequency modulation resources |
| CN115149579A (en) * | 2022-08-23 | 2022-10-04 | 华北电力大学（保定） | Fan virtual inertia control method and system based on system inertia requirements |
| CN115751279A (en) * | 2022-11-17 | 2023-03-07 | 国网新疆电力有限公司电力科学研究院 | Main steam temperature optimization control method and device for peak-shaving frequency-modulation thermal generator set |
| CN115986848A (en) * | 2022-12-27 | 2023-04-18 | 国网河北省电力有限公司沧州供电分公司 | Method and device for controlling variable power tracking characteristic of fan based on inertia demand |
-
2023
- 2023-06-21 CN CN202310744136.2A patent/CN117108444A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591395A (en) * | 2016-01-06 | 2016-05-18 | 清华大学 | Rotating speed recovery method of double-fed induction generator after virtual inertia control |
| US20210164442A1 (en) * | 2018-08-07 | 2021-06-03 | Università Degli Studi Di Genova | Method and system for controlling non-inertial generators, in particular wind generators, by inertia emulation |
| CN110594093A (en) * | 2019-08-29 | 2019-12-20 | 湖北工业大学 | Double-fed fan inertia control method based on second-order frequency differential of power system |
| CN113904346A (en) * | 2021-09-29 | 2022-01-07 | 云南电网有限责任公司电力科学研究院 | Wind turbine generator rotating speed recovery method considering hydroelectric frequency modulation resources |
| CN115149579A (en) * | 2022-08-23 | 2022-10-04 | 华北电力大学（保定） | Fan virtual inertia control method and system based on system inertia requirements |
| CN115751279A (en) * | 2022-11-17 | 2023-03-07 | 国网新疆电力有限公司电力科学研究院 | Main steam temperature optimization control method and device for peak-shaving frequency-modulation thermal generator set |
| CN115986848A (en) * | 2022-12-27 | 2023-04-18 | 国网河北省电力有限公司沧州供电分公司 | Method and device for controlling variable power tracking characteristic of fan based on inertia demand |
Non-Patent Citations (2)
| Title |
|---|
| 兰飞，潘益丰，时萌，黎静华: "双馈风电机组变系数虚拟惯量优化控制", 电力系统自动化, vol. 43, no. 12, 30 June 2019 (2019-06-30), pages 51 - 57 * |
| 李颖颖，王德林，范林源，苑承勋，赵迎弟，康积涛: "双馈风电机组限功率运行下频率稳定的 变系数控制策略", 电网技术, vol. 43, no. 8, 31 August 2019 (2019-08-31), pages 2910 - 2917 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111864813B (en) | Wind/thermal power combined frequency control method based on virtual weight coefficient | |
| CN107453410B (en) | Load disturbance double-fed fan participated wind-diesel micro-grid frequency modulation control method | |
| US9261079B2 (en) | Arrangement for generating a control signal for controlling a power output of a power generation system | |
| CN106130421B (en) | A kind of inertia control system and method based on double-fed fan motor unit | |
| CN109586319B (en) | Frequency modulation method and system for participation system of wind turbine generator | |
| CN109861251B (en) | Double-fed fan comprehensive control method for micro-grid transient-steady-state frequency optimization | |
| CN106286128B (en) | A kind of system frequency control method and device of off-load variable-speed wind-power unit | |
| CN108474346A (en) | The control of wind power plant | |
| CN110768307A (en) | Wind power plant primary frequency modulation control method and system | |
| CN108521135B (en) | Wind-diesel-load coordinated frequency modulation method suitable for high-permeability renewable energy micro-grid | |
| Xu et al. | Coordination of wind turbines and synchronous generators for system frequency control | |
| CN108448623A (en) | A kind of doubly-fed wind turbine participates in the complex control system of primary frequency regulation of power network | |
| CN109038613A (en) | A kind of adaptive low frequency deloading method counted and wind-powered electricity generation virtual inertia/primary frequency modulation responds | |
| CN109560573B (en) | Method and device for optimizing frequency controller parameters of variable-speed wind turbine generator | |
| CN107565611A (en) | A kind of method of wind power plant inertia frequency modulation | |
| CN107658910A (en) | A kind of power system frequency modulation frequency modulation method based on DFIG and synchronous generator | |
| CN109698522B (en) | Control method for DFIG (doubly fed induction generator) participating in frequency modulation by optimally utilizing kinetic energy of rotor | |
| CN108119301B (en) | Shutdown control method and device of wind generating set | |
| CN108347059A (en) | The Wind turbines award setting method and AGC models adjusted suitable for secondary frequency | |
| CN115149579A (en) | Fan virtual inertia control method and system based on system inertia requirements | |
| CN108092323A (en) | A kind of electric system AGC optimal control methods containing DFIG | |
| CN103701378B (en) | A kind of output power control method for wind driven generator | |
| CN109193778A (en) | A kind of inertia response revolving speed recovery control method based on the estimation of wind power | |
| CN109787274A (en) | A kind of virtual synchronous control method and rotor-side frequency converter controller | |
| CN108377004B (en) | Wind-storage coordination frequency modulation method and system based on virtual synchronous machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |