CN115513972A - Energy storage optimal configuration method and system considering frequency modulation capability of double-fed fan - Google Patents
Energy storage optimal configuration method and system considering frequency modulation capability of double-fed fan Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The energy storage optimal configuration method and system considering the frequency modulation capability of the double-fed fan calculate the frequency modulation power support capability of the double-fed wind turbine generator based on the frequency deviation of a power grid, determine the energy storage configuration capacity of the double-fed wind turbine generator participating in the frequency modulation of the power grid according to the power output capability of different control strategies of the double-fed wind turbine generator and by combining the power support target of the wind turbine generator under the disturbance of the power grid, realize the economy of an energy storage configuration scheme on the premise of fully utilizing the frequency modulation capability of the wind turbine generator and ensuring the safe operation through the coordination control of the wind turbine generator and the energy storage, and provide technical support for the safe operation of a high-proportion new energy power grid.
Description
Technical Field
The invention belongs to the technical field of a new energy and energy storage grid-related performance control strategy, and particularly relates to a new energy and energy storage frequency modulation capability cooperative control method and system.
Background
In recent years, wind generating sets in China grow rapidly, and double-fed wind generating sets, as a main machine type, account for a high proportion of the wind generating sets which are connected to the grid. Due to the weak damping characteristic of the wind turbine generator, the frequency stability of a wind power high-proportion power grid is greatly reduced, and the supporting capacity of the wind turbine generator on the power grid frequency must be improved. Due to uncertainty of wind energy, the capacity of the wind turbine generator set participating in power grid frequency modulation under the maximum power tracking wind power generation principle is insufficient, energy storage must be configured, and the frequency stability of a power grid is improved jointly through coordinated optimization control of the wind turbine generator set and an energy storage system.
The core problem of the wind turbine generator and the energy storage cooperative frequency modulation is that the optimization of energy storage configuration is realized on the premise of ensuring the safe operation of the wind turbine generator and the energy storage, the requirement of power grid frequency modulation is met, the economy of the energy storage configuration is realized, and the method has important significance for improving the frequency stability of the wind power high-proportion power grid.
In prior art 1 (cn201610820932. X, entitled announcement date 2019-06-28) "a doubly-fed wind turbine-energy storage system simulation synchronous machine frequency modulation characteristic control strategy" includes: the method comprises the steps of constructing a double-fed wind turbine generator-energy storage system considering the self frequency modulation capability of wind power, capacity configuration of the double-fed wind turbine generator-energy storage system for simulating the frequency modulation characteristic of a synchronous machine, frequency modulation control strategy analysis of the double-fed wind turbine generator-energy storage system and the like. Based on the system frequency modulation requirement and the self frequency modulation capability of the double-fed wind turbine generator, energy storage is reasonably configured, and the frequency modulation capability is reasonably distributed, so that the double-fed wind turbine generator-energy storage system has the frequency response capability similar to that of a traditional synchronous generator.
In the prior art 2 (CN 201510694896.2, entitled announcement date 2018-05-01) "an energy storage configuration method for coordinating a wind farm to participate in primary frequency modulation of a power system" includes: the method comprises the following contents of a proportion wind abandoning method for providing primary frequency modulation standby for a power system by a wind power plant, determination of effective standby capacity of the wind power plant, evaluation indexes of wind abandoning utilization rate when the wind power plant provides the primary frequency modulation standby for the power system, a control strategy A for coordinating the wind power plant to participate in the primary frequency modulation energy storage system of the power system, a control strategy B for coordinating the wind power plant to participate in the primary frequency modulation energy storage system of the power system, determination of rated power capacity and rated energy capacity of the energy storage system and the like, and can reduce the wind abandoning electric quantity and realize the optimal configuration of the energy storage system on the premise of providing the same primary frequency modulation standby.
In prior art 3 (CN 202110010767.2, entitled announcement date 2022-07-29) "energy storage optimization control method considering wind power dispatching and frequency modulation limit" includes: and establishing a wind storage and transportation model with the maximum profit of the wind power storage station as a target under the power market environment by utilizing a strategy that the energy storage auxiliary wind power plant tracks a day-ahead scheduling plan and participates in frequency modulation. When the energy storage SOE state is normal, the capability of the wind power plant for tracking the dispatching plan can be improved, so that the index of the tracking dispatching plan is obviously reduced compared with that when the energy storage SOE state is not available; frequency safety constraint formed by the frequency modulation limit of the power grid can force energy storage to provide frequency modulation power, and the frequency safety of the power grid is effectively maintained.
In the prior art 4 (CN 202110816276.7, entitled announcement date 2021-10-15) "hybrid energy storage frequency modulation control method and device for wind power plant" includes: judging whether the hybrid energy storage system meets primary frequency modulation/virtual inertia response and AGC frequency modulation conditions or not according to the frequency deviation of the grid-connected point, the frequency change rate, the first electric quantity state of the power type flywheel energy storage array system and the second electric quantity state of the energy type battery energy storage array system; if so, entering a primary frequency modulation/virtual inertia response control mode or an AGC frequency modulation control mode; if not, entering a locking state. The method improves the stability and the safety of the new energy power generation participating in the primary frequency modulation/virtual inertia response and AGC frequency modulation of the power grid.
At present, the frequency modulation of a wind turbine generator participation system by scholars at home and abroad mainly comprises two aspects: the first aspect is that a control strategy of the wind turbine generator is improved, so that an operation curve of the wind turbine generator is lower than a maximum power tracking curve, and partial spare capacity is reserved to participate in system frequency modulation; the second aspect is that a certain capacity of stored energy is configured, and the wind power-stored energy system participates in frequency modulation by utilizing the characteristic that the stored energy absorbs/releases energy. However, the control strategy of the wind turbine generator is simply improved, the phenomenon of frequency secondary drop caused by rotor rotation speed recovery exists, the frequency modulation capability cannot meet the power grid requirement, and the spare capacity is determined according to experience; the frequency modulation capability of the wind turbine generator is not considered in the configuration of energy storage, so that the loss of mechanical parts of the wind turbine generator is aggravated, the energy storage configuration capacity is large, and the system economy is reduced.
The key point of the wind turbine generator-energy storage cooperative frequency modulation lies in that the optimization of energy storage configuration capacity is realized on the premise of fully utilizing the self frequency modulation capability of the wind turbine generator and ensuring the running safety of a fan, and the method has important significance for improving the frequency stability of a wind power high-proportion power grid.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an energy storage optimal configuration method and system considering the frequency modulation capability of a double-fed fan. And the maximization of the coordinated frequency modulation capability of the fan and the stored energy and the economy of the energy storage configuration scheme are realized through the coordinated control of the wind turbine generator and the stored energy.
The invention adopts the following technical scheme.
In a first aspect, the invention discloses an energy storage optimal configuration method considering the frequency modulation capability of a double-fed fan, which is characterized by comprising the following steps:
step A1, collecting input wind speed v of a wind turbine generator t Output power, rotor speed; collecting the power grid frequency and calculating the power grid frequency deviation;
step A2, comparing whether the power grid frequency deviation exceeds the frequency modulation dead zone range of the wind turbine generator, and when the power grid frequency deviation does not exceed the frequency modulation dead zone range of the wind turbine generator, the fan does not participate in frequency modulation; when the frequency deviation of the power grid exceeds the frequency modulation dead zone of the wind turbine generator, the wind turbine generator enters a frequency modulation mode, and the step A3 is carried out;
step A3, in the frequency modulation mode, calculating active power capable of being absorbed/released by the fan according to the running state of the fan, and according to the frequency modulation capability of the fan and a fan frequency modulation power instruction P issued by power grid scheduling r Judging whether energy storage needs to be configured or not by comparing the energy storage capacity with the energy storage capacity, and obtaining the energy storage capacity which needs to be configured to meet the requirement of the power grid frequency modulation instruction;
step A4, forming energy distribution which can be absorbed/released by the units under different wind speeds and different frequencies, and calculating the frequency modulation capacity power requirements of the wind generation units under different frequency deviations according to the power grid frequency deviation;
and step A5, establishing an optimization model considering the self running state of the stored energy and the rotor state of the wind turbine generator based on the cooperative optimization relation of the wind turbine generator and the stored energy in different running states, and realizing maximization of the frequency modulation capacity of the wind turbine generator and the stored energy and economy of stored energy configuration in different running states.
Preferably, in step A1, the grid frequency deviation Δ f e The following relational expression is satisfied:
Δf e ＝f e -f eN (2)
in the formula, f e Representing the operating frequency of the grid, f eN The rated frequency of the power grid is represented, the value is 50Hz, and the frequency modulation dead zone of the wind turbine generator is +/-0.05 Hz.
Preferably, step A3 includes:
step A3.1, according to the running speed omega of the generator t Upper limit of rotation speed omega max Lower limit of rotation speed ω min Calculating to obtain the energy and active power which can be absorbed/released by the wind turbine generator set;
step A3.2, when the self frequency modulation capability of the fan can meet the frequency modulation instruction, the fan completes frequency modulation, and energy storage does not need to be configured;
and step A3.3, when the self frequency modulation capability of the fan cannot meet the frequency modulation instruction, additional power support is required to be provided by energy storage, and the energy storage capacity required to be configured for meeting the requirement of the power grid frequency modulation instruction is obtained.
Preferably, in step A3.1, wind turbine generator rotor speed ω 'is calculated according to the following formula' t ；
In the formula (f) e* Per unit value, P, representing the frequency of the grid ref Active power given value, omega ', representing machine side converter control system' t Indicating given rotor speed, f ir* The unit value of the rotor current frequency is represented, and a, b and c respectively represent the rotor speed and active power given P of the generator ref Coefficient of the relationship between them.
Preferably, in step a3.1, the energy that the wind turbine can release is calculated as:
the wind turbine generator set has upward adjustable active power of
The energy that the wind turbine can absorb is:
the active power of the wind turbine generator is adjustable downwards
Bonding of
And obtaining the function of the active power of the wind turbine generator set which can be adjusted upwards and downwards as the wind speed.
Preferably, the upper limit and the lower limit of the rotating speed operation of the rotor of the wind turbine generator set are respectively set to be 1.2p.u. and 0.8p.u.
Preferably, in step a3.2, the power command P is transmitted according to the delivered fan frequency modulation power command P r If the energy absorbed/released by the rotor of the wind turbine can meet the requirement P of the grid frequency modulation instruction r In time, energy storage is not needed.
Preferably, in step a3.3, when the upward frequency modulation power of the wind turbine generator does not meet the requirement P of the grid frequency modulation instruction r When is, P r The demand of grid frequency modulation instruction is combined, power support is provided by energy storage, and the power support capability is as follows:
P s ＝P r -P up (8)
when the downward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r When is, P r The energy storage is needed to provide power support, and the power support capability is as follows:
P s ＝P r -P down (9)
by P s The energy storage capacity required to be configured to meet the demand of the grid frequency modulation command can be determined.
Preferably, in the step A4, based on the energy absorbed/released by the rotor of the wind turbine generator in different operating states, the frequency modulation energy margin distribution of the wind turbine generator under the grid frequency modulation target is formed according to the formulas (3) to (6).
Preferably, in step A5, the objective function of the energy storage state configuration optimization model is as follows:
min{(P r,t -(P s,t +P re,t ))+ρk s }，t＝1,2,…,T (10)
in the formula, P r,t 、P s,t 、P re,t Respectively representing a scheduling frequency modulation instruction, energy storage frequency modulation power and new energy frequency modulation power at the moment T, wherein T represents the number of research time periods; k is a radical of s Denotes the number of charge and discharge cycles, and ρ denotes a weight.
Preferably, the constraint conditions of the optimization model comprise energy storage capacity constraint and unit rotor rotating speed running state constraint;
wherein, the energy storage capacity is restricted as shown in the following formula:
-E s,rated ≤E s,t ≤E s,rated (11)
and (3) restricting the running state of the rotor of the unit as shown in the following formula:
ω min ≤ω t ≤ω max (12)
in the formula, E s,rated 、E s,t Respectively representing the energy storage capacity and the energy at time t.
In a second aspect, the invention discloses a cooperative frequency modulation method considering frequency modulation capability and energy storage capacity of a double-fed fan, which is characterized in that,
the method comprises the following steps:
b1, setting the rated power, the frequency modulation dead zone and the upper and lower limits of the frequency modulation power of the wind turbine;
step B2, determining the energy storage optimal configuration capacity by using the energy storage optimal configuration method considering the frequency modulation capability of the double-fed fan in the first aspect of the invention;
b3, collecting the power grid frequency, and calculating the power grid frequency deviation;
step B4, when the frequency deviation of the power grid does not exceed the frequency modulation dead zone range of the wind turbine generator, the control strategy is kept unchanged;
step B5, when the frequency deviation of the power grid exceeds the frequency modulation dead zone range of the wind turbine generator, the wind turbine generator enters a frequency modulation mode, a frequency modulation power instruction is issued to the fan according to power grid scheduling, and when the frequency modulation capability of the fan can meet the frequency modulation instruction, the fan completes frequency modulation; when the self frequency modulation capability of the fan can not meet the frequency modulation instruction, the fan and the stored energy are coordinated to realize the frequency modulation of the power grid.
Preferably, step B1 comprises: the frequency modulation dead zone of the wind turbine generator is +/-0.05 Hz, and the per unit values of the upper limit and the lower limit of the rotor rotating speed are 1.2 and 0.8 respectively.
Preferably, step B5 comprises:
step B5.1, according to the delivered fan frequency modulation power instruction P r If the energy absorbed/released by the rotor of the wind turbine generator can meet the requirement P of the grid frequency modulation instruction r In time, the energy storage capacity does not need to be called;
the energy that the wind turbine can release is:
the wind turbine generator set has upward adjustable active power of
The energy that the wind turbine can absorb is:
the active power of the wind turbine generator set which can be adjusted downwards is
I.e. when P is r When the active power is within the range of the active power of the fan which can be adjusted downwards and upwards, the energy storage capacity does not need to be called;
step B5.2, if the energy absorbed/released by the rotor of the wind turbine generator does not meet the requirement of a power grid frequency modulation instruction, the energy storage capacity needs to be called;
when the upward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r In time, the demand of the grid frequency modulation instruction is combined, the energy storage is required to provide power support, and the power support capability is
P s ＝ P r -P up (8)
When the downward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r When P is present r The energy storage is required to provide power support, and the power support capacity is
P s ＝P r -P down (9)
P s Namely the energy storage capacity which needs to be called to meet the requirement of the power grid frequency modulation instruction.
In a third aspect, the invention discloses an energy storage configuration system,
the system comprises: the system comprises a data acquisition module, a fan and energy storage optimization module and a fan and energy storage cooperative frequency modulation module;
the acquisition module is used for acquiring the power grid frequency and the rotor rotating speed of the doubly-fed wind turbine generator and calculating the power grid frequency deviation;
the fan and energy storage optimization module is used for realizing energy storage capacity optimization in a given scene;
and the fan and energy storage cooperative frequency modulation module is used for realizing common frequency modulation of the fan and the energy storage under the condition of ensuring safe operation of the fan and the energy storage and meeting the requirement of a power grid frequency modulation instruction.
The beneficial effects of the invention are that compared with the prior art:
1. based on the 'variable speed constant frequency' characteristic of the double-fed wind turbine generator, the rotating potential energy of the rotor of the double-fed wind turbine generator is fully utilized to realize that the wind turbine generator participates in power grid frequency modulation;
2. the method comprises the steps that energy storage is applied to improve the frequency modulation capability of a wind turbine generator, an energy storage configuration scheme meeting the frequency modulation target is determined through collaborative optimization of the energy storage and the wind turbine generator, and the primary frequency modulation requirement of a power grid is met on the premise that the safety of the wind turbine generator and the economy of energy storage configuration are guaranteed;
3. the energy optimization distribution of the fan in different running states under a time sequence is realized through the cooperative running of the fan and the stored energy without the condition that the running curve of the wind turbine generator is always lower than the maximum power tracking curve;
4. the energy storage configuration capacity can be reduced, and the economic level of the energy storage configuration of the new energy station is improved.
Drawings
Fig. 1 is a block diagram of steps of an energy storage optimization configuration method and system considering the frequency modulation capability of a doubly-fed wind turbine in the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art without inventive step, are within the scope of protection of the present invention.
The present application is further described below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Referring to fig. 1, the energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine includes steps 1 to 5, which are as follows:
step 1, collecting input wind speed v of a wind turbine generator t Calculating the output power and the rotor speed of the wind generating set under the maximum power tracking principle according to a wind speed-output power curve and an output power-speed curve; collecting power grid frequency and calculating power grid frequency deviation, and when the power grid frequency deviation exceeds the frequency modulation dead zone of the wind turbine generator, issuing a frequency modulation power instruction P of a draught fan r The rated frequency of the wind turbine generator is 50Hz, the frequency modulation dead zone is +/-0.05 Hz, and the frequency modulation power instruction P r Determining according to the actual scheduling requirement;
in step 1, the grid frequency deviation Δ f e The following relational expression is satisfied:
Δf e ＝f e -f eN (1)
in the formula (f) e Representing the operating frequency of the grid, f eN Representing the rated frequency of the grid.
Step 2, comparing whether the power grid frequency deviation exceeds the frequency modulation dead zone range of the wind turbine generator, and when the power grid frequency deviation does not exceed the frequency modulation dead zone range of the wind turbine generator, keeping the control strategy unchanged and enabling the fan not to participate in frequency modulation; when the frequency deviation of the power grid exceeds the frequency modulation dead zone range of the wind turbine generator, the wind turbine generator enters a frequency modulation mode, a power curve of the wind turbine generator deviating from the maximum power tracking is achieved according to the frequency deviation of the power grid, and the power grid is modulated by means of cooperative control of rotating energy and stored energy of a fan rotor.
Step 3, in the frequency modulation mode, calculating the active power capable of being absorbed/released by the fan according to the running state of the fan, and according to the frequency modulation capability of the fan and a fan frequency modulation power instruction P issued by power grid scheduling r Judging whether energy storage needs to be configured or not by comparing the energy storage capacity with the energy storage capacity, and obtaining the energy storage capacity which needs to be configured to meet the requirement of the power grid frequency modulation instruction;
the step 3 comprises the following steps:
step 3.1, combining the upper and lower running limits of the rotor speed of the wind turbine generator and the rotor speed omega' t Calculating the active power and energy E which can be absorbed/released by the wind turbine generator 1 ；
Calculating the rotor speed omega of the wind turbine generator set according to the following formula' t ；
In the formula (f) e* Per unit value, P, representing the frequency of the grid ref Active power given value, omega ', representing machine side converter control system' t Indicating given rotor speed, f ir* The unit value of the rotor current frequency is represented, and a, b and c respectively represent the rotor speed and active power given P of the generator ref Coefficient of the relationship between them.
Specifically, according to the generator operation speed ω t Upper limit of rotation speed omega max Lower limit of rotation speed omega min And the upper limit and the lower limit of the rotating speed operation of the rotor of the wind turbine generator are respectively set to be 1.2p.u. and 0.8p.u., and the releasable energy of the wind turbine generator is calculated as follows:
the wind turbine generator set has upward adjustable active power of
The energy absorbable by the wind turbine generator is as follows:
the active power of the wind turbine generator set which can be adjusted downwards is
Bonding with
The function of the active power of the wind turbine generator set which can be adjusted upwards and downwards as the wind speed can be obtained.
3.2, according to the issued fan frequency modulation power instruction, if the energy absorbed/released by the rotor of the wind turbine generator can meet the requirement of the grid frequency modulation instruction, the fan completes frequency modulation without configuring energy storage, otherwise, the energy storage is configured;
and 3.3, when the self frequency modulation capability of the fan cannot meet the frequency modulation instruction, the fan needs to store energy to provide extra power support, and the fan and the stored energy coordinate to realize power grid frequency modulation. And obtaining the energy storage capacity required to be configured to meet the requirement of the power grid frequency modulation instruction, and finally determining the energy storage configuration capacity.
Specifically, when the upward frequency modulation power of the wind turbine generator does not meet the requirement of a power grid frequency modulation instruction, the requirement of the power grid frequency modulation instruction is combined, the energy storage is required to provide power support, and the power support capacity is
P s ＝P r -P up (8)
When the downward frequency modulation power of the wind turbine generator does not meet the requirement of the power grid frequency modulation instruction, the energy is required to be stored to provide power support, and the power support capacity is
P s ＝P r -P down (9)
Therefore, the energy storage capacity which needs to be configured for meeting the requirement of the power grid frequency modulation instruction in different operation states can be determined.
Step 4, forming energy distribution which can be absorbed/released by the units under different wind speeds and different frequencies, and calculating the frequency modulation capability power requirements of the wind generation units under different frequency deviations according to the power grid frequency deviation;
specifically, based on the energy absorbed/released by the rotor of the wind turbine generator in different operating states, according to the formula (3) -the formula (6), frequency modulation energy margin distribution of the wind turbine generator under the grid frequency modulation target is formed;
and 5, establishing an optimization model considering the self state of the stored energy and the rotor state of the wind turbine generator based on the cooperative optimization relation between the wind turbine generator and the stored energy in different running states, and realizing the maximization of the frequency modulation capability of the wind turbine generator and the stored energy and the economy of stored energy configuration in different running states. And finally determining the energy storage capacity and power under different operation states.
Specifically, along with the change of the running state of the wind turbine generator, the self regulation capacity and the energy storage regulation capacity of the wind turbine generator can be changed, and the wind turbine generator and the energy storage regulation capacity need to be optimized in order to ensure that the frequency modulation capacity of the wind turbine generator and the energy storage meets the requirement of a power grid frequency modulation instruction. The energy storage configuration mathematical model is as follows:
objective function
min{(P r,t -(P s,t +P re,t ))+ρk s }，t＝1,2,…,T (10)
Constraint conditions are as follows:
(1) Energy storage capacity constraint
-E s,rated ≤E s,t ≤E s,rated (11)
(2) Constraint of running state of rotor of unit
ω min ≤ω t ≤ω max (12)
In the formula, E s,rated 、E s,t Respectively representing the energy storage capacity and the energy at time t.
The equations (3) to (12) form an energy storage optimization configuration model considering the frequency modulation capability of the double-fed fan.
According to the formula (3) -formula (6), frequency modulation energy margin distribution of a wind turbine generator set under a power grid frequency modulation target is formed;
determining the frequency modulation power of the fan according to the formula (3) to the formula (7);
determining the energy storage coordination frequency modulation power of the fan according to the formulas (3) to (9);
and determining the energy storage optimal configuration capacity according to the formula (10) to the formula (12).
The scheme also discloses a cooperative frequency modulation method considering the frequency modulation capability and the energy storage capacity of the double-fed fan, which comprises the following steps of:
b1, setting the rated power, the frequency modulation dead zone and the upper and lower limits of the frequency modulation power of the wind turbine;
the frequency modulation dead zone of the wind turbine is +/-0.05 Hz, and the upper and lower limit per unit values of the rotor speed are 1.2 and 0.8 respectively.
B2, determining the energy storage optimal configuration capacity;
b3, collecting the power grid frequency, and calculating the power grid frequency deviation;
step B4, when the frequency deviation of the power grid does not exceed the frequency modulation dead zone range of the wind turbine generator, the control strategy is kept unchanged;
step B5, when the frequency deviation of the power grid exceeds the frequency modulation dead zone range of the wind turbine generator, the wind turbine generator enters a frequency modulation mode, a frequency modulation power instruction is issued to the fan according to power grid scheduling, and when the frequency modulation capability of the fan can meet the frequency modulation instruction, the fan completes frequency modulation; when the frequency modulation capability of the fan can not meet the frequency modulation instruction, the fan and the stored energy are coordinated to realize the frequency modulation of the power grid.
Specifically, the method comprises the following steps:
step B5.1, according to the delivered fan frequency modulation power instruction P r If the energy absorbed/released by the rotor of the wind turbine generator can meet the requirement P of the grid frequency modulation instruction r In time, the energy storage capacity does not need to be called;
the energy that the wind turbine generator can release is:
the wind turbine generator set has upward adjustable active power of
The energy that the wind turbine can absorb is:
the active power of the wind turbine generator set which can be adjusted downwards is
I.e. when P r When the active power is within the range of the active power of the fan which can be adjusted downwards and upwards, the energy storage capacity does not need to be called;
step B5.2, if the energy absorbed/released by the rotor of the wind turbine generator does not meet the requirement of a power grid frequency modulation instruction, the energy storage capacity needs to be called;
when the upward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r In time, the demand of the power grid frequency modulation instruction is combined, the energy storage is required to provide power support, and the power support capacity is
P s ＝P r -P up (8)
When the downward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r When is, P r The energy storage is required to provide power support, and the power support capacity is
P s ＝P r -P down (9)
P s Namely the energy storage capacity which needs to be called to meet the requirement of the power grid frequency modulation instruction.
This scheme has still disclosed a system, includes: the system comprises a data acquisition module, a fan and energy storage optimization module and a fan and energy storage cooperative frequency modulation module;
the acquisition module is used for acquiring the power grid frequency and the rotor rotating speed of the doubly-fed wind turbine generator and calculating the power grid frequency deviation;
the fan and the energy storage optimization module realize the optimization of energy storage capacity in a given scene;
and the fan and energy storage cooperative frequency modulation module is used for realizing common frequency modulation of the fan and the energy storage under the condition of ensuring safe operation of the fan and the energy storage and meeting the requirement of a power grid frequency modulation instruction.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (15)
1. An energy storage optimization configuration method considering the frequency modulation capability of a doubly-fed wind turbine is characterized by comprising the following steps:
step A1, collecting input wind speed v of a wind turbine generator t Output power, rotor speed; collecting the power grid frequency and calculating the power grid frequency deviation;
step A2, comparing whether the power grid frequency deviation exceeds the frequency modulation dead zone range of the wind turbine generator, and when the power grid frequency deviation does not exceed the frequency modulation dead zone range of the wind turbine generator, the fan does not participate in frequency modulation; when the frequency deviation of the power grid exceeds the frequency modulation dead zone of the wind turbine generator, the wind turbine generator enters a frequency modulation mode, and the step A3 is carried out;
step A3, in the frequency modulation mode, calculating active power capable of being absorbed/released by the fan according to the running state of the fan, and according to the frequency modulation capability of the fan and a fan frequency modulation power instruction P issued by power grid scheduling r Judging whether energy storage needs to be configured or not by comparing the energy storage capacity with the energy storage capacity, and obtaining the energy storage capacity which needs to be configured to meet the requirement of the power grid frequency modulation instruction;
step A4, forming energy distribution which can be absorbed/released by the units under different wind speeds and different frequencies, and calculating the frequency modulation capacity power requirements of the wind generation units under different frequency deviations according to the power grid frequency deviation;
and step A5, establishing an optimization model considering the self running state of the stored energy and the rotor state of the wind turbine generator based on the cooperative optimization relation of the wind turbine generator and the stored energy in different running states, and realizing maximization of the frequency modulation capacity of the wind turbine generator and the stored energy and economy of stored energy configuration in different running states.
2. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 1,
in step A1, the grid frequency deviation Δ f e The following relational expression is satisfied:
Δf e ＝f e -f eN (2)
in the formula (f) e Representing the operating frequency of the grid, f eN The rated frequency of the power grid is represented, the value is 50Hz, and the frequency modulation dead zone of the wind turbine generator is +/-0.05 Hz.
3. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 1,
step A3 includes:
step A3.1, according to the running speed omega of the generator t Upper limit of rotation speed omega max Lower limit of rotation speed omega min Calculating to obtain the energy and active power which can be absorbed/released by the wind turbine generator set;
step A3.2, when the self frequency modulation capability of the fan can meet the frequency modulation instruction, the fan completes frequency modulation, and energy storage does not need to be configured;
and step A3.3, when the self frequency modulation capability of the fan cannot meet the frequency modulation instruction, additional power support is required to be provided by energy storage, and the energy storage capacity required to be configured for meeting the requirement of the power grid frequency modulation instruction is obtained.
4. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 1,
in the step A3.1, the rotating speed omega 'of the rotor of the wind turbine generator set is calculated according to the following formula' t ；
In the formula (f) e* Per unit value, P, representing the frequency of the grid ref Active power given value, omega ', representing machine side converter control system' t Indicating given rotor speed, f ir* The unit value of the rotor current frequency is represented, and a, b and c respectively represent the rotor speed and active power given P of the generator ref Coefficient of the relationship between them.
5. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 4, wherein,
in step a3.1, calculating the energy that can be released by the wind turbine generator as follows:
the wind turbine generator set has upward adjustable active power of
The energy that the wind turbine can absorb is:
the active power of the wind turbine generator is adjustable downwards
Bonding of
And obtaining the function of the active power of the wind turbine generator set which can be adjusted upwards and downwards as the wind speed.
6. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 5, wherein,
the upper limit and the lower limit of the rotating speed operation of the rotor of the wind turbine generator set are respectively set to be 1.2p.u. and 0.8p.u.
7. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 4, wherein,
in step A3.2, according to the issued fan frequency modulation power instruction P r If the energy absorbed/released by the rotor of the wind turbine generator can meet the requirement P of the grid frequency modulation instruction r In time, energy storage is not needed.
8. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 4, wherein,
in the step A3.3, when the upward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r When P is present r And combining the demand of a power grid frequency modulation instruction, the power support is provided by energy storage, and the power support capacity is as follows:
P s ＝P r -P up (8)
when the downward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r When is, P r The energy storage is needed to provide power support, and the power support capability is as follows:
P s ＝P r -P down (9)
by P s The energy storage capacity required to be configured to meet the requirement of the grid frequency modulation command can be determined.
9. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 5, wherein,
in the step A4, based on the energy absorbed/released by the rotor of the wind turbine generator in different operating states, according to the formula (3) -the formula (6), frequency modulation energy margin distribution of the wind turbine generator under the grid frequency modulation target is formed.
10. The energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine as claimed in claim 1,
in step A5, the objective function of the energy storage state configuration optimization model is:
min{(P r,t -(P s,t +P re,t ))+ρk s }，t＝1,2,…,T (10)
in the formula, P r,t 、P s,t 、P re,t Respectively representing a scheduling frequency modulation instruction, energy storage frequency modulation power and new energy frequency modulation power at the moment T, wherein T represents the number of research time periods; k is a radical of s Represents the number of charge and discharge cycles, and ρ represents a weight.
11. The method for energy storage optimization configuration considering frequency modulation capability of the doubly fed wind turbine as claimed in claim 10, wherein,
the constraint conditions of the optimization model comprise energy storage capacity constraint and unit rotor rotating speed running state constraint;
wherein, the energy storage capacity is restricted as shown in the following formula:
-E s,rated ≤E s,t ≤E s,rated (11)
and (3) restricting the running state of the rotor of the unit as shown in the following formula:
ω min ≤ω t ≤ω max (12)
in the formula, E s,rated 、E s,t Respectively representing the energy storage capacity and the energy at time t.
12. A coordinated frequency modulation method considering frequency modulation capability and energy storage capacity of a double-fed fan is characterized by comprising the following steps:
b1, setting the rated power, the frequency modulation dead zone and the upper and lower limits of the frequency modulation power of the wind turbine;
step B2, determining the energy storage optimal configuration capacity by using the energy storage optimal configuration method considering the frequency modulation capacity of the double-fed fan according to any one of claims 1 to 11;
b3, collecting the power grid frequency, and calculating the power grid frequency deviation;
step B4, when the frequency deviation of the power grid does not exceed the frequency modulation dead zone range of the wind turbine generator, the control strategy is kept unchanged;
step B5, when the frequency deviation of the power grid exceeds the frequency modulation dead zone range of the wind turbine generator, the wind turbine generator enters a frequency modulation mode, a frequency modulation power instruction is issued to the fan according to power grid scheduling, and when the frequency modulation capability of the fan can meet the frequency modulation instruction, the fan completes frequency modulation; when the self frequency modulation capability of the fan can not meet the frequency modulation instruction, the fan and the stored energy are coordinated to realize the frequency modulation of the power grid.
13. A coordinated frequency modulation method considering frequency modulation capability and energy storage capacity of a doubly fed wind turbine as claimed in claim 12,
the step B1 comprises the following steps: the frequency modulation dead zone of the wind turbine generator is +/-0.05 Hz, and the per unit values of the upper limit and the lower limit of the rotor rotating speed are 1.2 and 0.8 respectively.
14. A coordinated frequency modulation method considering frequency modulation capability and energy storage capacity of a doubly fed wind turbine as claimed in claim 12,
step B5 comprises the following steps:
step B5.1, according to the issued fan frequency modulation power instruction P r If the energy absorbed/released by the rotor of the wind turbine generator can meet the requirement P of the grid frequency modulation instruction r In time, the energy storage capacity does not need to be called;
the energy that the wind turbine generator can release is:
the wind turbine generator set has upward adjustable active power of
The energy that the wind turbine can absorb is:
the active power of the wind turbine generator set which can be adjusted downwards is
I.e. when P is r When the active power is within the range of the active power of the fan which can be adjusted downwards and upwards, the energy storage capacity does not need to be called;
step B5.2, if the energy absorbed/released by the rotor of the wind turbine generator does not meet the requirement of a power grid frequency modulation instruction, the energy storage capacity needs to be called;
when the upward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r In time, the demand of the power grid frequency modulation instruction is combined, the energy storage is required to provide power support, and the power support capacity is
P s ＝P r -P up (8)
When the downward frequency modulation power of the wind turbine generator does not meet the requirement P of the power grid frequency modulation instruction r When P is present r The energy storage is required to provide power support, and the power support capacity is
P s ＝P r -P down (9)
P s Namely the energy storage capacity which needs to be called to meet the requirement of the power grid frequency modulation instruction.
15. The energy storage configuration system realized by the energy storage optimization configuration method considering the frequency modulation capability of the doubly-fed wind turbine in any one of claims 1 to 11,
the system comprises: the system comprises a data acquisition module, a fan and energy storage optimization module and a fan and energy storage cooperative frequency modulation module;
the acquisition module is used for acquiring the power grid frequency and the rotor rotating speed of the doubly-fed wind turbine generator and calculating the power grid frequency deviation;
the fan and energy storage optimization module is used for realizing energy storage capacity optimization in a given scene;
and the fan and energy storage cooperative frequency modulation module is used for realizing common frequency modulation of the fan and the energy storage under the condition of ensuring safe operation of the fan and the energy storage and meeting the requirement of a power grid frequency modulation instruction.
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