CN115492718A - Active power control method, system, equipment and medium for primary frequency modulation - Google Patents
Active power control method, system, equipment and medium for primary frequency modulation Download PDFInfo
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses an active power control method, system, equipment and medium for primary frequency modulation, which relate to the technical field of wind power generation, and the method comprises the following steps: the method comprises the steps of obtaining current active power and target active power aiming at a wind driven generator, wherein the current active power represents the active power actually output by a converter of the wind driven generator at the current wind speed, and the target active power represents a target power value of the wind driven generator set based on a power grid dispatching AGC instruction; determining the active power change proportion according to the current active power and the target active power; and determining a target operation parameter of the wind driven generator according to the active power change proportion and the current operation parameter of the wind driven generator so that the wind driven generator operates according to the target operation parameter, wherein the current operation parameter comprises at least one of a current pitch maximum speed limit value, a current reference rotating speed and a current active change slope.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to an active power control method, system, equipment and medium for primary frequency modulation.
Background
In recent years, the wind power industry develops rapidly, and the proportion of the wind power industry in a power grid is gradually increased. The wind generating set is a system for converting kinetic energy of wind into electric energy, and comprises a wind wheel and a generator, wherein the wind wheel comprises blades, a hub, a reinforcing member and the like, and the wind generating set has the functions of generating electricity by the rotation of the blades under the action of wind power, rotating a generator head and the like. The wind generating set cannot keep constant rotating speed operation for a long time due to the influence of wind speed on operation, and the generator rotor side of the wind generating set is connected with a power grid through a frequency converter, so that the active power at the outlet of the wind generating set cannot change due to the change of the load of the power grid, and the wind generating set cannot respond when the frequency of a power system changes. A traditional power system mostly adopts synchronous wind generating sets, after large-scale wind generating sets are connected to the grid, inertia of the power system can be reduced due to the reduction of the synchronous wind generating sets, and the wind generating sets are provided to have a primary frequency modulation function in order to enable the power system to stably operate.
The desired frequency can be obtained by controlling the rotational speed of the generator according to the formula (n =60f/p, where n denotes the rotational speed of the motor per minute, the value 60 is the number of seconds per minute, f denotes the power frequency, and p denotes the number of pole pairs of the motor). According to the law of conservation of energy, if the load of an electric system is increased, the rotating speed of a generator is reduced, the corresponding frequency of a power grid is reduced, and therefore active power output is added to the power grid; if the load of the power system is reduced, the rotational speed of the generator will increase, and the corresponding grid frequency will increase, and at this time the active power delivered to the grid should be reduced. According to the above principle, the primary frequency modulation function of the existing wind generating set is realized by controlling the active power output, namely: when the frequency of the power grid system jumps down, the active power output is increased; and when the frequency of the power grid system is increased, the active power output is reduced.
In the early-mounted wind generating set, the blades are short, the self operating characteristics of the short-blade wind generating set are different from those of generators such as thermal power generators, hydroelectric power generators, nuclear power generators and the like, stable energy sources do not exist, and the wind generating set is based on a calculation formula of wind energy in unit time (the formula is P = C) p ηρ(s*cosθ 1 )(V*cosθ 2 ) 3 (iv)/2, wherein P represents wind energy per unit time; c p The theoretical maximum value of the coefficient of wind energy utilization is 0.593; eta represents mechanical conversion efficiency, rho represents air density, s represents wind area of the blade, and theta 1 Representing blade pitch angle, V representing real-time wind speed, theta 2 Representing the wind angle), the wind energy in unit time is related to the current wind speed, the wind area of the blade of the wind generating set and the wind angle factor, the blade pitch angle needs to be adjusted when absorbing energy, but the active power response speed of the wind generating set is slow due to the fact that the blade is short and the adjusting speed of the blade is slow and has certain hysteresis. At present, in the primary frequency modulation process of a wind generating set, the phenomena that the active power output cannot reach a frequency modulation power target value, the power falls back after the active power reaches the frequency modulation power target value, and the time that the active power reaches the frequency modulation power target value cannot meet the requirement exist.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the primary frequency modulation function of the existing wind power generation set has the phenomena that the active power output cannot reach the target value of the frequency modulation power, the power falls back after the active power reaches the target value of the frequency modulation power, and the time of the active power reaching the target value of the frequency modulation power cannot meet the requirement, so that the technical requirement of primary frequency modulation action cannot be met. In order to solve the technical problem, the invention provides an active power control method, system, equipment and medium for primary frequency modulation.
The technical scheme for solving the technical problems is as follows:
an active power control method for primary frequency modulation, comprising:
the method comprises the following steps that S1, the current active power and the target active power of the wind driven generator are obtained, the current active power represents the active power actually output by a converter of the wind driven generator at the current wind speed, and the target active power represents the target power value of the wind driven generator set based on a power grid dispatching AGC instruction;
s2, determining an active power change proportion according to the current active power and the target active power;
and S3, determining a target operation parameter of the wind driven generator according to the active power change proportion and the current operation parameter of the wind driven generator so that the wind driven generator operates according to the target operation parameter, wherein the current operation parameter comprises at least one of a current pitch maximum pitch speed limit value, a current reference rotating speed and a current active change slope.
The wind speeds of different positions of the same wind field are different, so that the wind energy absorbed by the wind driven generators of different positions is different, and the active power required to be increased or reduced by each wind driven generator during primary frequency modulation is also different. The active power change proportion represents the maximum value of the stable lifting energy of the wind driven generator, and when the stable lifting energy of the wind driven generator exceeds the active power change proportion, the wind driven generator operates according to the current operating parameters, and the conditions that the active power output does not reach the frequency modulation power target value and the power falls back after the active power reaches the frequency modulation power target value exist.
The beneficial effects of the invention are: during the primary frequency modulation action of the wind generating set, the active power change proportion is determined according to the current active power and the target active power of the wind generating set, the target operation parameter of the wind generating set is determined according to the active power change proportion and the current operation parameter of the wind generating set, and according to the target operation parameter of the wind generating set, when the wind generating set operates based on the target operation parameter, the rotor rotating speed, the blade pitch angle and the active change slope of the wind generating set can be matched with each other, so that the energy storage of a transmission chain of the wind generating set is increased, the energy conversion is accelerated, the active power output of the wind generating set can reach a frequency modulation power target value and is kept stable, the normal output of the active power of the wind generating set is kept, and the wind generating set can meet the technical requirement of the primary frequency modulation action without extra hardware cost.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the determining an active power change ratio according to the current active power and the target active power specifically includes:
determining the active power change proportion through a first formula according to the current active power and the target active power, wherein the first formula is as follows:
active power change ratio = (target active power-current active power)/unit rated power.
The beneficial effect of adopting the further scheme is that: the active power change proportion is determined according to the current active power and the target active power, and a foundation is laid for subsequently determining the target operation parameters of the wind driven generator and enabling the wind driven generator set to meet the technical requirements of primary frequency modulation actions.
Further, if the current operating parameter includes the current maximum pitch rate limit value, in step S3, a target operating parameter of the wind turbine is determined according to the active power change ratio and the current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, which specifically includes:
if the active power change proportion is larger than a preset change threshold value, increasing the current variable pitch maximum pitch speed limit value to obtain a target variable pitch maximum pitch speed limit value, and taking the target variable pitch maximum pitch speed limit value as the target operation parameter so that the wind driven generator operates according to the target variable pitch maximum pitch speed limit value; the maximum pitch speed limit value of the target variable pitch is not greater than a preset pitch speed safety threshold value;
and if the active power change proportion is not larger than the change threshold, taking the current pitch variation maximum pitch speed limit value as the target operation parameter so as to enable the wind driven generator to operate according to the current pitch variation maximum pitch speed limit value.
The beneficial effect of adopting the further scheme is that: the current maximum pitch speed limiting value of the variable pitch is increased, so that the wind area of the blade is increased, the wind driven generator absorbs more wind energy, the wind driven generator operates according to the determined target operation parameter, and the problems that the active power output cannot reach the target value of the frequency modulation power and the power falls back after the active power reaches the target value of the frequency modulation power in the primary frequency modulation function of the existing wind driven generator set can be solved.
Further, if the current operating parameter includes the current reference rotating speed, in step S3, a target operating parameter of the wind turbine is determined according to the active power change ratio and the current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, which specifically includes:
if the active power change proportion is positive, increasing the reference rotating speed of the wind driven generator to obtain a target reference rotating speed, and taking the target reference rotating speed as the target operation parameter to enable the wind driven generator to operate according to the target reference rotating speed; wherein the target reference rotating speed is not greater than a preset rotating speed safety threshold;
and if the active power change proportion is not a positive number, taking the current reference rotating speed as the target operating parameter so as to enable the wind driven generator to operate according to the current reference rotating speed.
The beneficial effect of adopting the further scheme is that: the wind driven generator operates according to the determined target operation parameters, and the problems that the active power output cannot reach a frequency modulation power target value and the power falls back after the active power reaches the frequency modulation power target value in the primary frequency modulation function of the existing wind driven generator set can be solved.
Further, if the operation parameter includes the current active power change slope, the step S3 of determining a target operation parameter of the wind turbine generator according to the active power change ratio and the current operation parameter of the wind turbine generator, so that the wind turbine generator operates according to the target operation parameter specifically includes:
obtaining a current active change slope, wherein the current active change slope represents a current torque change slope of the wind driven generator;
determining the time required by power change according to the current active change slope and the active power change proportion;
if the time required by the power change is larger than a preset time threshold, increasing the active power change slope of the wind driven generator according to the time threshold and the time required by the power change to obtain a target active power change slope, and taking the target active power change slope as the target operation parameter to enable the wind driven generator to operate according to the target active power change slope; the target active change slope is not greater than a preset slope safety threshold;
and if the time required by the power change is not greater than the time threshold, taking the current active change slope as the target operation parameter so that the wind driven generator operates according to the current active change slope.
The beneficial effect of adopting the above further scheme is: the wind driven generator operates according to the determined target operation parameters, and the problem that the time for the active power to reach the frequency modulation power target value cannot meet the requirement in the primary frequency modulation function of the existing wind driven generator set can be solved.
Further, the increasing an active power change slope of the wind turbine generator according to the time threshold and the time required by the power change to obtain a target active power change slope specifically includes:
determining an expected active change slope according to the time threshold and the time required by the power change;
if the preset active change slope threshold is larger than the expected active change slope, determining the active change slope threshold as the target active change slope;
if the active change slope threshold is not greater than the expected active change slope, determining the expected active change slope as the target active change slope.
The beneficial effect of adopting the further scheme is that: and determining a target active change slope according to the magnitude relation between the preset slope threshold and the expected active change slope, so that the time for the active power of the wind generating set to reach the frequency modulation power target value is within the time required by the primary frequency modulation technical requirement.
Further, the determining an expected active change slope according to the time threshold and the time required for power change specifically includes:
according to the time threshold and the time required by the power change, determining the expected active change slope through a second formula, wherein the second formula is as follows:
the beneficial effect of adopting the further scheme is that: and determining the expected active change slope according to the time threshold and the time required by power change, so that the target active change slope can be determined conveniently in the follow-up process.
In order to solve the above technical problem, the present invention further provides an active power control system for primary frequency modulation, including:
the data acquisition module is used for acquiring current active power and target active power of the wind driven generator, wherein the current active power represents the active power actually output by a converter of the wind driven generator at the current wind speed, and the target active power represents a target power value of the wind driven generator set based on a power grid dispatching AGC instruction;
the data processing module is used for determining the active power change proportion according to the current active power and the target active power;
and the unit operation control module is used for determining a target operation parameter of the wind driven generator according to the active power change proportion and the current operation parameter of the wind driven generator so as to enable the wind driven generator to operate according to the target operation parameter, wherein the current operation parameter comprises at least one of a current pitch maximum pitch speed limit value, a current reference rotating speed and a current active change slope.
In order to solve the above technical problem, the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the active power control method for primary frequency modulation as described above when executing the computer program.
In order to solve the above technical problem, the present invention further provides a computer-readable storage medium, having a computer program stored thereon, where the computer program, when executed by a processor, implements the active power control method for primary frequency modulation as described above.
Drawings
Fig. 1 is a schematic flowchart a of an active power control method for primary frequency modulation according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart B of an active power control method for primary frequency modulation according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an active power control system for primary frequency modulation according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more complete and thorough understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
It should be understood that the various steps recited in method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.
The term "including" and variations thereof as used herein is intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing the devices, modules or units, and are not used for limiting the devices, modules or units to be different devices, modules or units, and also for limiting the sequence or interdependence relationship of the functions executed by the devices, modules or units.
It is noted that references to "a" or "an" in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will appreciate that references to "one or more" are intended to be exemplary and not limiting unless the context clearly indicates otherwise.
In view of the above technical problems in the prior art, an embodiment of the present disclosure provides an active power control method for primary frequency modulation, where the method starts to detect and judge data in a primary frequency modulation start signal, determines an active power change ratio according to a current active power and a target active power of an obtained wind turbine, and then determines a target operating parameter of the wind turbine according to the active power change ratio and a current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, thereby solving technical problems in the prior art, where the current operating parameter includes at least one of a current maximum pitch rate limit value, a current reference rotation speed, and a current active change slope. The reason for determining the target operation parameter of the wind driven generator by taking the current maximum pitch speed limit value of the variable pitch, the current reference rotating speed and the current active change slope is as follows:
the output energy of the wind generating set is in direct proportion to the energy obtained by the wind driven generator, and when the wind driven generator is not required to output too high energy, the energy obtained by the wind generating set needs to be reduced, so that the load of a transmission chain is reduced, and the rotating speed of the wind driven generator is reduced in order to reduce the energy of the transmission chain. In the active power limiting state of the wind generating set, when the torque calculated value is larger than the maximum torque output value, the torque output is equal to the maximum torque output value; and when the calculated torque value is not greater than the maximum torque output value, the torque output is equal to the calculated torque value, wherein the calculated torque value is the current torque value calculated by the wind generating set controller according to the current running condition and the performance of the wind generating set, and the maximum torque output value is the maximum torque allowed to be output by the wind generating set in the state of limiting the active power of the wind generating set. The active power of the wind generating set is improved under the power limiting state of the wind generating set, a maximum torque output value can be calculated according to a motor torque calculation formula (the formula is 9550P = n T, wherein P represents the output power of the wind generating set, n represents the rotating speed of the wind generating set, and T represents the electromagnetic torque of the wind generating set), mechanical energy is converted into electric energy along with the improvement of power, the rotating speed of the wind generating set is rapidly reduced, after the rotating speed is lower than a reference rotating speed, a torque PID (calculated torque value) is gradually reduced, meanwhile, the blade pitch angle is adjusted, the wind receiving area of a wind receiving blade is increased, the absorbed wind energy is improved, and when the rotating speed is lower than the maximum torque output value, the torque PID is executed to ensure the rotating speed to be increased, and the power falls or the power cannot reach a target value. According to the law of conservation of energy, the root cause is that the adjustment of the blade pitch angle has certain hysteresis, the wind energy increased during the adjustment is less than the energy of the part of the mechanical energy converted into the electric energy, and the calculation of the torque is influenced by the actual rotating speed of the wind driven generator and the actual active power of the converter, so that during the primary frequency modulation, the active change slope is adjusted, the maximum pitch speed limit value of the variable pitch is increased, the reference rotating speed is increased, and after the blades are in place, the problems of power drop and power failure to reach the target value can be solved. And for the adjustment of the blade pitch angle, a pitch control system in the wind turbine generator control system is set according to the determined maximum pitch speed limit value of the pitch control of the wind turbine generator and the reference rotating speed. The response rate of the active power of the wind generating set can be improved by improving the torque variation of each period according to the maximum torque output value calculated by the motor torque calculation formula.
The following describes the technical solutions of the present disclosure and how to solve the above technical problems in detail with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present disclosure will be described below with reference to the accompanying drawings.
Fig. 1 and fig. 2 show a schematic flowchart of an active power control method for primary frequency modulation according to an embodiment of the present disclosure, and as shown in the diagram, the method includes steps S1 to S3, where:
step S1, obtaining current active power and target active power aiming at the wind driven generator.
The current active power represents the active power actually output by the converter of the wind driven generator at the current wind speed, and the target active power represents the target power value of the wind driven generator set based on a power grid dispatching AGC (automatic gain control) instruction (calculated and issued by an energy power system management platform (SCADA)).
And S2, determining the active power change proportion according to the current active power and the target active power.
The calculation formula of the active power change proportion is as follows:
the rated power of the unit is determined according to the model of the wind generating set, for example, the rated power of a sea-mounted wind power H111-2.0MW type unit is 2000kW.
And S3, determining a target operation parameter of the wind driven generator according to the active power change proportion and the current operation parameter of the wind driven generator so that the wind driven generator operates according to the target operation parameter, wherein the current operation parameter comprises at least one of a current pitch maximum pitch speed limit value, a current reference rotating speed and a current active change slope.
The maximum pitch speed limit value of the variable pitch represents the current speed of the wind power generator for absorbing wind energy, the current reference rotating speed represents the current rotating speed of the wind power generator, and the current active change slope represents the current torque change slope of the wind power generator. Specifically, the operation of the wind turbine generator according to the target operation parameter may refer to adjustment of a blade pitch angle according to the target operation parameter.
If the current operating parameter includes the current maximum pitch rate limit value, in step S3, a target operating parameter of the wind turbine is determined according to the active power change ratio and the current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, which specifically includes:
if the active power change proportion is larger than a preset change threshold value, increasing the current variable pitch maximum pitch speed limit value to obtain a target variable pitch maximum pitch speed limit value, and taking the target variable pitch maximum pitch speed limit value as the target operation parameter so that the wind driven generator operates according to the target variable pitch maximum pitch speed limit value; wherein the target variable pitch maximum pitch speed limit value is not greater than a preset pitch speed safety threshold;
and if the active power change proportion is not larger than the change threshold, taking the current pitch variation maximum pitch speed limit value as the target operation parameter so as to enable the wind driven generator to operate according to the current pitch variation maximum pitch speed limit value.
And in the period of one frequency conversion, if the current blade speed is less than the target variable pitch maximum pitch speed limit value, the blade carries out variable pitch according to the current blade speed, and if the current blade speed is not less than the target variable pitch maximum pitch speed limit value, the blade carries out variable pitch according to the target variable pitch maximum pitch speed limit value.
According to the calculation formula of the wind energy in the unit time and the Betz theory, when the wind driven generator operates at the wind speed lower than the rated wind speed, the rotating speed of the wind driven generator is controlled through the electromagnetic torque, the maximum wind energy utilization coefficient is tracked, and the maximum mechanical energy can be obtained.
If the current operating parameter includes the current reference rotating speed, in step S3, a target operating parameter of the wind turbine is determined according to the active power change ratio and the current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, which specifically includes:
if the active power change proportion is positive, increasing the reference rotating speed of the wind driven generator to obtain a target reference rotating speed, and taking the target reference rotating speed as the target operation parameter to enable the wind driven generator to operate according to the target reference rotating speed; wherein the target reference rotating speed is not greater than a preset rotating speed safety threshold;
and if the active power change proportion is not a positive number, taking the current reference rotating speed as the target operating parameter so as to enable the wind driven generator to operate according to the current reference rotating speed.
In the invention, the reference rotating speed is set after a simulation experiment is carried out according to the torque-rotating speed characteristic of the wind generating set so as to ensure that the torque calculated by the rotating speed difference obtained by the wind generating set at different rotating speeds is an optimal torque curve, wherein the numerical value of the rotating speed difference is the numerical value obtained by subtracting the reference rotating speed from the real-time rotating speed of the wind generating set. The maximum torque value correspondingly output by the wind driven generator at different rotating speeds can be determined through rotating speed-torque curves of different machine types. For the maximum torque output value, when the current torque output value of the wind driven generator exceeds the maximum torque output value, the current torque output value of the wind driven generator is equal to the set maximum torque output value, otherwise, the maximum torque output value is equal to the current torque output value of the wind driven generator. In order to better control the rotating speed of the wind driven generator, the electromagnetic torque and the blade pitch angle of the wind driven generator are controlled by a PID controller, the PID controller controls the wind driven generator to run periodically according to the running period, and the electromagnetic torque and the blade pitch angle of the wind driven generator are controlled according to the error between the real-time rotating speed of the wind driven generator and the reference rotating speed, such as a first formula and a second formula. Wherein the first formula is:
T PID ＝T Last +K p ×(ω-ω 0 )+k i ×T×(ω+ω 0 )/2
the second formula is:
P PID ＝P LAST +(K p ×(ω-ω 0 )+k i ×T×(ω+ω 0 )/2)×G
in the above formula, T PID Representing the electromagnetic torque, T, of the wind turbine Last Electromagnetic torque, K, representing the previous operating period of the wind turbine p Denotes the proportionality coefficient, K i Representing the integral coefficient, k d Representing the differential coefficient, T representing the error accumulation time, ω representing the difference in rotational speed of the wind turbine during the current operating cycle, ω 0 Representing the difference in rotational speed of the wind turbine during the previous operating cycle, G representing the non-linear gain, P PID Representing blade pitch angle, P LAST Representing the blade pitch angle of the wind turbine in the last operating cycle, wherein K p 、K i And G, determining based on a simulation result obtained after a simulation experiment is carried out on the control part of the wind generating set.
If the operating parameter includes the current active power change slope, the step S3 determines a target operating parameter of the wind turbine generator according to the active power change ratio and the current operating parameter of the wind turbine generator, so that the wind turbine generator operates according to the target operating parameter, specifically including:
obtaining a current active change slope representing a current torque change slope of the wind driven generator;
determining the time required by power change according to the current active change slope and the active power change proportion; in this embodiment, the calculation formula of the time required for power change is:
power change required time = active power change ratio/current active change slope
If the time required by the power change is larger than a preset time threshold, increasing the active change slope of the wind driven generator according to the time threshold and the time required by the power change to obtain a target active change slope, and taking the target active change slope as the target operation parameter so that the wind driven generator operates according to the target active change slope; the target active change slope represents the maximum value of active change slope change of the wind driven generator in one operating period of the PLC, and the target active change slope is not greater than a preset slope safety threshold; the time threshold represents the time for completing the primary frequency modulation action, and can be set according to different power grid requirements of different regions;
and if the time required by the power change is not greater than the time threshold, taking the current active change slope as the target operation parameter so as to enable the wind driven generator to operate according to the current active change slope.
The method for obtaining the target active change slope by increasing the active change slope of the wind driven generator according to the time threshold and the time required by the power change specifically comprises the following steps:
determining an expected active change slope according to the time threshold and the time required by the power change;
if the preset active change slope threshold is larger than the expected active change slope, determining the active change slope threshold as the target active change slope;
and if the active change slope threshold value is not greater than the expected active change slope, determining the expected active change slope as the target active change slope.
Wherein, the determining an expected active change slope according to the time threshold and the time required for power change specifically includes:
determining the expected active change slope through a second formula according to the time threshold and the time required by the power change, wherein the second formula is as follows:
it should be noted that, in the operation process of the wind turbine generator set, triggering the primary frequency modulation signal enters a primary frequency modulation control state, the frequency modulation signal can be triggered automatically or manually, and how to trigger the frequency modulation signal does not belong to the protection scope of the present invention. In addition, the change threshold, the pitch speed safety threshold, the rotating speed safety threshold and the slope safety threshold mentioned in the invention are all determined based on a simulation result obtained after a simulation experiment is carried out on a control part of the wind generating set. The change threshold and the active change slope threshold can be set after a simulation experiment is carried out on the generating capacity of the wind generating set, and can also be set according to a field test result, and the setting standards are as follows: after the active power change proportion exceeds the set change threshold value, the situation that the active power of the wind generating set is not lifted in place or cannot be stabilized after being lifted in place is avoided.
Based on the same principle as the active power control method for primary frequency modulation in the embodiment of the present disclosure, an embodiment of the present disclosure further provides an active power control system for primary frequency modulation, as shown in fig. 3, the system includes a data acquisition module, a data processing module, and a unit operation control module, where:
the data acquisition module is used for acquiring current active power and target active power aiming at the wind driven generator, wherein the current active power represents the active power actually output by a converter of the wind driven generator at the current wind speed, and the target active power represents a target power value of the wind driven generator set based on a power grid dispatching AGC instruction;
the data processing module is used for determining the active power change proportion according to the current active power and the target active power;
the unit operation control module is configured to determine a target operation parameter of the wind turbine generator according to the active power change ratio and a current operation parameter of the wind turbine generator, so that the wind turbine generator operates according to the target operation parameter, where the current operation parameter includes at least one of a current pitch maximum pitch speed limit value, a current reference rotation speed, and a current active change slope.
When determining the active power change proportion according to the current active power and the target active power, the data processing module is specifically configured to:
determining the active power change proportion through a first formula according to the current active power and the target active power, wherein the first formula is as follows:
active power change ratio = (target active power-current active power)/unit rated power.
When the current operating parameter includes the current maximum pitch rate limit value, the unit operation control module is configured to determine a target operating parameter of the wind turbine generator according to the active power change ratio and the current operating parameter of the wind turbine generator, so that when the wind turbine generator operates according to the target operating parameter, the unit operation control module is specifically configured to:
if the active power change proportion is larger than a preset change threshold value, increasing the current variable pitch maximum pitch speed limit value to obtain a target variable pitch maximum pitch speed limit value, and taking the target variable pitch maximum pitch speed limit value as the target operation parameter so that the wind driven generator operates according to the target variable pitch maximum pitch speed limit value; the maximum pitch speed limit value of the target variable pitch is not greater than a preset pitch speed safety threshold value;
and if the active power change proportion is not larger than the change threshold, taking the current pitch variation maximum pitch speed limit value as the target operation parameter so as to enable the wind driven generator to operate according to the current pitch variation maximum pitch speed limit value.
When the current operating parameter includes the current reference rotating speed, the unit operation control module determines a target operating parameter of the wind turbine generator according to the active power change ratio and the current operating parameter of the wind turbine generator, so that when the wind turbine generator operates according to the target operating parameter, the unit operation control module is specifically configured to:
if the active power change proportion is positive, increasing the reference rotating speed of the wind driven generator to obtain a target reference rotating speed, and taking the target reference rotating speed as the target operation parameter to enable the wind driven generator to operate according to the target reference rotating speed; wherein the target reference rotating speed is not greater than a preset rotating speed safety threshold;
and if the active power change proportion is not a positive number, taking the current reference rotating speed as the target operating parameter so as to enable the wind driven generator to operate according to the current reference rotating speed.
When the operation parameter includes the current active change slope, the unit operation control module is specifically configured to, when determining a target operation parameter of the wind turbine according to the active power change ratio and the current operation parameter of the wind turbine, so that the wind turbine operates according to the target operation parameter:
obtaining a current active change slope representing a current torque change slope of the wind driven generator;
determining the time required by power change according to the current active change slope and the active power change proportion;
if the time required by the power change is larger than a preset time threshold, increasing the active change slope of the wind driven generator according to the time threshold and the time required by the power change to obtain a target active change slope, and taking the target active change slope as the target operation parameter so that the wind driven generator operates according to the target active change slope; the target active change slope is not greater than a preset slope safety threshold;
and if the time required by the power change is not greater than the time threshold, taking the current active change slope as the target operation parameter so that the wind driven generator operates according to the current active change slope.
When the active change slope of the wind driven generator is increased according to the time threshold and the time required by the power change by the unit operation control module to obtain a target active change slope, the unit operation control module is specifically configured to:
determining an expected active change slope according to the time threshold and the time required by the power change;
if the preset active change slope threshold is larger than the expected active change slope, determining the active change slope threshold as the target active change slope;
if the active change slope threshold is not greater than the expected active change slope, determining the expected active change slope as the target active change slope.
When determining the expected active change slope according to the time threshold and the time required by the power change, the unit operation control module is specifically configured to:
determining the expected active change slope through a second formula according to the time threshold and the time required by the power change, wherein the second formula is as follows:
based on the same principle as the active power control method for primary frequency modulation in the embodiment of the present disclosure, an embodiment of the present disclosure further provides an electronic device, as shown in fig. 4, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the method as shown in the foregoing.
Based on the same principle as the active power control method for primary frequency modulation in the embodiments of the present disclosure, embodiments of the present disclosure also provide a computer-readable storage medium having a computer program stored thereon, which when executed by a processor implements the method as shown above.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An active power control method for primary frequency modulation, comprising:
the method comprises the following steps that S1, the current active power and the target active power of the wind driven generator are obtained, the current active power represents the active power actually output by a converter of the wind driven generator at the current wind speed, and the target active power represents the target power value of the wind driven generator set based on a power grid dispatching AGC instruction;
s2, determining an active power change proportion according to the current active power and the target active power;
and S3, determining a target operation parameter of the wind driven generator according to the active power change proportion and the current operation parameter of the wind driven generator so that the wind driven generator operates according to the target operation parameter, wherein the current operation parameter comprises at least one of a current pitch maximum pitch speed limit value, a current reference rotating speed and a current active change slope.
2. The active power control method for primary frequency modulation according to claim 1, wherein the determining an active power change ratio according to the current active power and the target active power specifically includes:
according to the current active power and the target active power, determining the active power change proportion through a first formula, wherein the first formula is as follows:
active power change ratio = (target active power-current active power)/unit rated power.
3. The active power control method for primary frequency modulation according to claim 1, wherein if the current operating parameter includes the current maximum pitch rate limit value, the step S3 determines a target operating parameter of the wind turbine according to the active power variation ratio and the current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, specifically comprising:
if the active power change proportion is larger than a preset change threshold value, increasing the current variable pitch maximum pitch speed limit value to obtain a target variable pitch maximum pitch speed limit value, and taking the target variable pitch maximum pitch speed limit value as the target operation parameter so that the wind driven generator operates according to the target variable pitch maximum pitch speed limit value; wherein the target variable pitch maximum pitch speed limit value is not greater than a preset pitch speed safety threshold;
and if the active power change proportion is not larger than the change threshold, taking the current pitch variation maximum pitch speed limit value as the target operation parameter so as to enable the wind driven generator to operate according to the current pitch variation maximum pitch speed limit value.
4. The method according to claim 1, wherein if the current operating parameter includes the current reference rotating speed, the step S3 determines a target operating parameter of the wind turbine according to the active power variation ratio and the current operating parameter of the wind turbine, so that the wind turbine operates according to the target operating parameter, specifically comprising:
if the active power change proportion is positive, increasing the reference rotating speed of the wind driven generator to obtain a target reference rotating speed, and taking the target reference rotating speed as the target operation parameter to enable the wind driven generator to operate according to the target reference rotating speed; wherein the target reference rotating speed is not greater than a preset rotating speed safety threshold;
and if the active power change proportion is not a positive number, taking the current reference rotating speed as the target operating parameter so as to enable the wind driven generator to operate according to the current reference rotating speed.
5. The method according to claim 1, wherein if the operation parameter includes the current active change slope, the step S3 determines a target operation parameter of the wind turbine according to the active power change ratio and the current operation parameter of the wind turbine, so that the wind turbine operates according to the target operation parameter, specifically comprising:
obtaining a current active change slope, wherein the current active change slope represents a current torque change slope of the wind driven generator;
determining the time required by power change according to the current active change slope and the active power change proportion;
if the time required by the power change is larger than a preset time threshold, increasing the active change slope of the wind driven generator according to the time threshold and the time required by the power change to obtain a target active change slope, and taking the target active change slope as the target operation parameter so that the wind driven generator operates according to the target active change slope; the target active change slope is not greater than a preset slope safety threshold;
and if the time required by the power change is not greater than the time threshold, taking the current active change slope as the target operation parameter so that the wind driven generator operates according to the current active change slope.
6. The active power control method for primary frequency modulation according to claim 5, wherein the step of increasing the active change slope of the wind turbine according to the time threshold and the time required for power change to obtain the target active change slope specifically comprises:
determining an expected active change slope according to the time threshold and the time required by the power change;
if the preset active change slope threshold is larger than the expected active change slope, determining the active change slope threshold as the target active change slope;
if the active change slope threshold is not greater than the expected active change slope, determining the expected active change slope as the target active change slope.
7. The method according to claim 6, wherein the determining an expected active change slope according to the time threshold and the time required for the power change comprises:
according to the time threshold and the time required by the power change, determining the expected active change slope through a second formula, wherein the second formula is as follows:
8. an active power control system for primary frequency modulation, comprising:
the data acquisition module is used for acquiring current active power and target active power aiming at the wind driven generator, wherein the current active power represents the active power actually output by a converter of the wind driven generator at the current wind speed, and the target active power represents a target power value of the wind driven generator set based on a power grid dispatching AGC (automatic gain control) instruction;
the data processing module is used for determining the active power change proportion according to the current active power and the target active power;
and the unit operation control module is used for determining a target operation parameter of the wind driven generator according to the active power change proportion and the current operation parameter of the wind driven generator so as to enable the wind driven generator to operate according to the target operation parameter, wherein the current operation parameter comprises at least one of a current pitch maximum pitch speed limit value, a current reference rotating speed and a current active change slope.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing an active power control method for primary modulation according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, implements a method for active power control for primary frequency modulation according to any one of claims 1 to 7.
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| CN202211033791.9A CN115492718A (en) | 2022-08-26 | 2022-08-26 | Active power control method, system, equipment and medium for primary frequency modulation |
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| CN202211033791.9A CN115492718A (en) | 2022-08-26 | 2022-08-26 | Active power control method, system, equipment and medium for primary frequency modulation |
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