CN111130137B - Micro-grid source-load dynamic frequency control method considering frequency modulation benefit - Google Patents
Micro-grid source-load dynamic frequency control method considering frequency modulation benefit 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
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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
Abstract
The invention relates to a micro-grid source-load dynamic frequency control method considering frequency modulation benefits, which comprises the following steps of: 1) acquiring temperature control load participation frequency modulation capacity; 2) calculating controllable load frequency modulation benefit B considering user comfortCL(ii) a 3) Adding virtual inertia control into the DFIG to obtain the frequency modulation capability, and obtaining the DFIG frequency modulation benefit B added with the virtual inertia controlwind(ii) a 4) Comprehensive DFIG frequency modulation benefit BwindAnd controllable load frequency modulation benefit BCLAnd adjusting the source-load dynamic frequency of the microgrid. Compared with the prior art, the invention has the advantages of comprehensive consideration of frequency modulation benefit, obvious frequency modulation effect and the like.
Description
Technical Field
The invention relates to the field of micro-grid frequency modulation containing a fan and a controllable load, in particular to a micro-grid source-load dynamic frequency control method considering frequency modulation benefits.
Background
The micro-grid can effectively integrate various distributed power supplies, energy storage devices and loads, realizes flexible, reliable and economic power supply for local areas, and becomes a research hotspot in the field of new energy in recent years. The isolated micro-grid can effectively solve the problems of poor power supply reliability, low energy development and utilization level and the like caused by the fact that a large number of islands in the east and south of China are far away from the continent and the power supply is single, brings opportunities for deep development and ecological protection of the islands and improvement of the living standard of residents, and has important strategic significance. However, the intermittent renewable energy sources (wind energy, solar energy, etc.) in the microgrid account for a large proportion, and the capability of resisting external environment disturbance during island operation is weak, so that the stability of the frequency of the microgrid is difficult to maintain. Therefore, frequency control remains one of the major bottlenecks in the development of the current isolated microgrid.
The traditional method focuses on a control strategy of a power generation side, a wind turbine generator participates in frequency adjustment of a microgrid, and a virtual inertia control module needs to be added in the control of the wind turbine generator to release kinetic energy of a rotor; the problem of cooperative auxiliary frequency modulation of the controllable load on the demand side and the supply side is also considered at a small part. However, the comprehensive consideration of the participation of the power supply side and the demand side in frequency modulation is lacked, and the evaluation of the source-load frequency modulation benefit is also lacked, so that the frequency modulation effect is general, and the frequency modulation cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a microgrid source-load dynamic frequency control method considering frequency modulation benefits.
The purpose of the invention can be realized by the following technical scheme:
a micro-grid source-load dynamic frequency control method considering frequency modulation benefits comprises the following steps:
1) acquiring temperature control load participation frequency modulation capacity;
2) calculating controllable load frequency modulation benefit B considering user comfortCL；
3) Adding virtual inertia control into the DFIG to obtain the frequency modulation capability, and obtaining the DFIG frequency modulation benefit B added with the virtual inertia controlwind；
4) Comprehensive DFIG frequency modulation benefit BwindAnd controllable load frequency modulation benefit BCLAnd adjusting the source-load dynamic frequency of the microgrid.
In the step 1), the temperature control device participates in the active power P of frequency modulationCLAnd (3) related to the start-stop temperature change value delta T of the temperature control equipment, the following steps are carried out:
wherein the content of the first and second substances,on% is the percentage of temperature-controlled load in the on state, off% is the percentage of temperature-controlled load in the off state, PNRated active power, T, consumed for temperature controlled loads+' and T_' the temperature values of the upper limit and the lower limit of the start and the stop of the temperature control equipment which can respond to the frequency change of the system are respectively.
In the step 2), the controllable load frequency modulation benefit BCLThe calculation formula of (A) is as follows:
where C is user comfort, Δ PCLActive power variation value, C, for a temperature control device participating in frequency regulation0For initial user comfort, m1Is a constant value of tnowIs the current time, kfIs the user engagement coefficient, f is the system frequency at the current time, fNThe system nominal frequency.
In the step 3), virtual inertia control added DFIG frequency modulation benefit BwindThe calculation formula of (A) is as follows:
wherein, tonFor the start of frequency modulation, PwindFor adding active power output, P, of fan during frequency modulation after virtual inertia control0The output of the front fan is used for participating in frequency modulation.
In the step 4), the wind turbine generator and the temperature control load in the microgrid are cooperatively controlled in a centralized control mode, the total frequency modulation benefit of the system is calculated by collecting the active power of the controllable load and the wind turbine generator at the current moment and the system frequency, and the virtual inertia parameter K when the total frequency modulation benefit of the system is maximum is obtainedinAnd a user engagement coefficient kfPerforming microgrid source-load operationAnd adjusting the state frequency.
In the step 4), the DFIG frequency modulation benefit B is integratedwindAnd controllable load frequency modulation benefit BCLThe objective function for carrying out the micro-grid source-load dynamic frequency adjustment is as follows:
wherein B is the total frequency modulation benefit of the system l1And l2Respectively, the weight of the frequency modulation benefit and the weight of the comfort of the controllable load,/3The frequency modulation benefit of the fan is weighted,
upper and lower limits, delta P, respectively, for the active power of the temperature control device participating in the frequency adjustment to be adjusted in unit timeLFor sudden loads in the microgrid, PLFor fixed loads, omega, in the microgridrIs the DFIG rotor speed, PGThe synchronous machine output is realized.
In the step 3), a virtual inertia parameter K is determined according to the frequency modulation benefit of the DFIGinThe method specifically comprises the following steps:
wherein r is1、r2Respectively, are adjustment constants.
In order to prevent the rotor rotating speed falling speed from being too high at the initial stage of frequency falling and influencing the subsequent recovery, the virtual inertia parameter is rapidly reduced at the frequency rising stage, and the rapid recovery of the rotating speed is ensured, then the virtual inertia parameter KinThe decreasing speed is greater than the increasing speed, the constant r is adjusted1And r2The relationship of (1) is:
r2＞r1。
compared with the prior art, the invention has the following advantages:
firstly, comprehensively considering frequency modulation benefits: by calculating the frequency modulation benefits of the source side and the load side, the cost of frequency modulation is reduced to the maximum extent.
Secondly, the source-load coordination frequency modulation effect is obvious: through the comprehensive consideration of the new energy source side and the controllable load side, the dynamic frequency deviation is effectively reduced, and compared with the traditional method that only the new energy source side is considered, the method has a more obvious frequency modulation effect.
Drawings
Fig. 1 is a schematic view of the operation state of a temperature-controlled load.
Fig. 2 is a schematic diagram of the temperature regulation of the refrigeration equipment.
Fig. 3 shows the frequency modulation benefits of the temperature controlled load participating in frequency modulation.
FIG. 4 is a block diagram of DFIG virtual inertia control.
Fig. 5 is an active power curve of DFIG participating in frequency modulation.
Fig. 6 shows a system source-load co-modulation strategy.
Fig. 7 is a block diagram of an optimal parameter value process.
Fig. 8 is a microgrid simulation system.
FIG. 9 shows the difference kfAnd obtaining a micro-grid frequency adjustment curve.
FIG. 10 shows different kfAnd the controllable load participates in the frequency modulation curve under the value taking.
Fig. 11 is a fan active power output curve under consideration of different frequency modulation benefits.
FIG. 12 is a graph of temperature controlled load participation frequency modulation curves under consideration of different frequency modulation benefits.
Fig. 13 is a frequency variation curve under consideration of different frequency modulation benefits.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
The invention provides a micro-grid source-load dynamic frequency adjusting method considering frequency modulation benefits, which comprises the following steps of:
1) the temperature control load participates in the calculation of the frequency modulation capacity;
2) calculating the controllable load frequency modulation benefit considering the comfort degree of a user;
3) calculating the DFIG frequency modulation benefit based on virtual inertia control;
4) and adjusting the source-load dynamic frequency of the microgrid based on the comprehensive frequency modulation benefit.
The method comprises the following specific steps:
1. firstly, calculating the active power change of a temperature control load participating in frequency modulation:
a Thermal Controlled Load (TCL) represented by an air conditioner, a refrigerator, and a heat pump is a most widely distributed demand-side resource at present, occupies a large share of power consumption, and has a large demand-side response potential. Due to the thermal energy storage characteristic of the air conditioning load control temperature, the load adjustment in a short time hardly affects the comfort of the user.
The temperature control load is divided into a refrigerating device and a heating device, the adjusting temperature of the temperature control load is set as T, the start and stop of different devices and the change rule of the adjusting temperature T along with the time T are shown in figure 1.
T+、T-Respectively serving as an upper limit signal and a lower limit signal for starting/stopping the temperature control equipment to keep the temperature within a set temperature range; t is t1，t2，t3Is the time at which the device starts/stops. According to the operating state shown in FIG. 1, taking the refrigeration appliance as an example, T+Will keep the equipment, which was originally in a stopped state, stopped for a short time, T-The upward movement of the power supply can quickly stop the equipment which is originally in the starting state, thereby achieving the purpose of reducing the required power. If the temperature control equipment is required to participate in the demand side response, a frequency change response is introduced, so that the upper limit and the lower limit of the temperature control equipment change along with the frequency signal of the microgrid, and the following formula is shown as follows:
ΔT＝pf(f-fN) (1)
wherein T '+ and T' -are eachIs the upper and lower limit signals of the temperature control equipment which can respond to the frequency change of the system, delta T is the upper and lower limit temperature change of the temperature control load, pfRepresenting the user engagement, the expression is:
pf＝kf|f-fN| (3)
pfrepresenting user engagement, is composed of two parts, wherein f-fNI reflects microgrid demand, kfThe user engagement coefficient is a coefficient related to the comfort of the user and the degree of wear of the electrical load, kfThe larger the signal, the more drastic the user responds to the system frequency change, the lower the user comfort, kfA value of 0 indicates that no system frequency adjustment is involved. When the micro-grid is at the rated frequency, a user does not need to participate in frequency modulation, when the frequency is lower than the rated frequency, the upper temperature limit is increased, and the lower the frequency is, the faster the upper temperature limit is increased.
As shown in FIG. 2, Δ T is measured as the system frequency decreases<0, requiring controllable load shedding if |. DELTA.T-<(T+-T-) I.e. temperature controlled load start up/down limit T+The temperature control load in the starting state can be increased properly, and the power consumption can be reduced correspondingly; if | Δ T | ≧ T (T)+-T-) When the temperature control load starting upper/lower limit exceeds the variable range and the corrected lower limit T' -is larger than the original upper limit, the temperature control loads in the original starting state are all switched to the stopping state.
When the system frequency increases, Δ T>0, requiring controllable load loading if | Delta T-<(T+-T-) I.e. temperature controlled load start up/down limit T+The temperature control load in the original starting state is unchanged, and the temperature control load in the original stopping state can correspondingly increase the power consumption; if | Δ T | ≧ T (T)+-T-) When the temperature control load start upper/lower limit exceeds the variable range and the corrected upper limit T' + is smaller than the original lower limit, the temperature control loads in the original stop state are all switched to the start state.
Active power P consumed by the temperature control deviceCLComprises the following steps:
wherein on% is the percentage of the temperature-controlled load in the on state, and off% is the percentage of the temperature-controlled load in the off state, PNThe rated active power consumed for the temperature controlled load.
2. Secondly, calculating the controllable load frequency modulation benefit considering the comfort degree of the user
When the temperature-controlled load participates in the system frequency adjustment, PCLParticipating in system frequency adjustment as shown in fig. 3, as the frequency decreases, the power consumed by the load decreases accordingly. At the angle of the microgrid, at the current moment tnowThe contribution of the load to the frequency is the benefit of participating in the frequency modulation, but the corresponding reduced comfort is the cost of participating in the frequency modulation.
The speed at which the user's comfort level decreases should be positively correlated with | Δ T |, i.e. as | Δ T | increases, the comfort level decreases faster and faster, i.e.:
the comfort level versus Δ T is then:
when the frequency is reduced after the small disturbance occurs, the controllable load frequency modulation benefit is as follows:
wherein, PCL0Active power of the controllable load in steady state, PCLActive power, Δ P, for real-time temperature control devices participating in frequency modulationCLThe active power change value of the temperature control device participating in frequency modulation during the frequency modulation is obtained.
The higher the participation degree of the temperature control device in active power of frequency modulation (controllable load frequency modulation), the lower the comfort degree of the temperature control device, and if the active power is to be achievedGood frequency modulation effect and user comfort (setting the current time as t)now) It should satisfy:
wherein, BCLThe frequency modulation benefit is obtained.
3. DFIG frequency modulation benefit calculation based on virtual inertia control
The traditional DFIG mostly adopts Maximum Power Point Tracking (MPPT) control to capture wind energy to the maximum extent, so that the DFIG only responds to wind speed and does not respond to frequency change, and when the frequency of a system drops due to the addition of virtual inertia control, the DFIG can release part of kinetic energy stored by a rotor to support the frequency; the control block diagram is shown in FIG. 4, where KinAs a virtual inertia parameter, PsetAnd the active power reference value of the rotor side converter. The virtual inertia control reduces the dynamic frequency deviation at the initial stage of frequency drop, and can effectively prevent the sudden large-range drop of the frequency. However, in the frequency rising stage, the DFIG output can have reverse shortage due to the fact that the rotor kinetic energy is stored by absorbing power due to the fact that the virtual inertia parameter is too large. When the virtual inertia is large, the larger the rotating speed drop value is, the larger the reverse shortage of the active output of the DFIG is, the faster the rotating speed recovery of the rotor is, but the rising rate of the frequency cannot rise quickly due to the limitation of the inertia. Therefore, in order to improve the fan output, the virtual inertia parameter of the wind turbine needs to be limited.
According to the change rule of the rotating speed of the wind turbine generator during frequency modulation, the response process of the wind turbine generator is divided into a frequency modulation stage and a rotating speed recovery stage. When the system frequency drops, the rotating speed of the unit is reduced, the active power of the unit is increased, and the phase is a frequency modulation phase; the unit starts to rebound and gradually recovers to the original rotating speed after the rotating speed of the unit falls to the lowest point, the rotating speed of the unit is recovered, the rotating speed of the unit is increased in the process, the kinetic energy of the rotor is increased, and the unit absorbs certain power from the power grid to compensate the kinetic energy of the rotor, so that the active power of the unit is reduced. Therefore, the frequency modulation benefit is defined as the actual output energy of the double-fed wind turbine generator set in the frequency modulation stage when the double-fed wind turbine generator set participates in system frequency modulation; the frequency modulation cost is defined as the energy absorbed by the unit from the system during the speed recovery phase, as shown in fig. 5.
The total frequency modulation benefit of the fan is the frequency modulation benefit minus the frequency modulation cost:
in the formula, tonFor the start of frequency modulation, PwindThe active power output of the fan during the frequency modulation period after the virtual inertia control is added; p0For participating in frequency modulation of the front fan output, BwindThe total frequency modulation benefit of the fan is obtained.
Based on the analysis of the DFIG virtual inertia control, the value trend of the virtual inertia parameter is the same as the change trend of the fan frequency modulation benefit, as shown in the following formula, wherein r2>r1The reason is that in order to prevent the rotor rotating speed falling speed from being too fast at the initial stage of frequency falling and influencing the subsequent recovery, the virtual inertia parameter is expected to be rapidly reduced in the frequency rising stage to ensure the rapid recovery of the rotating speed, so that K isinThe rate of decrease is greater than the rate of increase.
Therefore, the total frequency modulation benefit of the fan is gradually increased at the initial stage of frequency drop, namely when the wind turbine generator provides active power support, and the virtual inertia parameters are also gradually increased, so that the active power support amount of the fan to the frequency is ensured; once the rotating speed recovery period is started, the frequency modulation benefit is reduced to some extent, the virtual inertia parameter is also reduced rapidly, and the rapid rise of the rotating speed of the fan is guaranteed.
4. Micro-grid source-load dynamic frequency adjustment based on comprehensive frequency modulation benefit
The cooperative frequency control of the wind turbine generator and the controllable load under the island microgrid is realized, and the frequency modulation benefit of the system needs to be calculated by considering both the source-load sides.
At a certain time t after the system has been subjected to small disturbancesnowMeter for measuringCalculating the total frequency modulation benefit of the system, as shown in the following formulas (11), (12):
in the formula I1、l2Respectively the weight occupied by the frequency modulation benefit of the controllable load and the weight occupied by the comfort level; l3The method takes weight for the frequency modulation benefit of the fan.
Upper and lower limits, P, of the active power of the temperature control device participating in the frequency regulation in unit timeLFor fixed loads in the microgrid, Δ PLIs an abrupt load in the microgrid.
The essence of the source-load coordination is that the corresponding output of the source and the load at the next moment is determined by calculating the frequency modulation benefit. According to the constraint condition that the active output of the synchronous machine and the fan is equal to the active power of the load, if the frequency modulation benefit of the fan is large at a certain moment, the fan dominates the support of the frequency; if the frequency modulation benefit of the controllable load is large, the frequency support by load reduction of the controllable load is dominant. The benefit of each party for providing frequency support is analyzed, so that the distribution of the output condition of the power supply and the load shedding condition of the load is measured by the integral frequency modulation benefit, and the optimal power distribution is selected.
The invention carries out cooperative control on the wind turbine generator and the temperature control load in the microgrid by adopting a centralized control mode. Calculating the frequency adjustment benefit of the system by collecting the active power of the controllable load and the wind generating set at the current moment and the system frequency condition, sending the parameter which enables the frequency adjustment benefit to be maximum to each device, and setting the sampling time interval as tsamThe specific process is shown in fig. 6:
the optimal parameter value process at each moment is shown in fig. 7. t is tnowAt any moment, the controllable load obtains the frequency from the microgrid, and different k are calculated through formulas (4) and (7)fThe magnitude of the lower load frequency modulation benefit; calculating the frequency modulation benefit of the fan by the formula (9) at each sampling moment of the DFIG, and correspondingly changing the virtual inertia parameter KinFinally, the value of (c) is obtained by the equations (11) and (12) to obtain k with the maximum integrated frequency modulation benefitfAnd KinBringing in the next sampling instant.
5. Finally, simulation verification is carried out
An island microgrid model comprising a diesel engine (DS), a photovoltaic generator (PV), a wind power generator (WT), a controllable load, a fixed load and a temporary load is built, as shown in fig. 8. Wherein the rated capacity of the diesel engine set is 15MW, the wind turbine set is 3 each 1.5MW, the fixed load is 15MW, the temporary load is 1MW, and the controllable load is 0 ~ 1 MW.
1) Different kfMicro-grid frequency modulation simulation analysis under value taking
The invention analyzes the transient frequency response characteristic of the controllable temperature load polymer by setting the fault of the micro-grid. When t is set to 3s, a 1MW temporary load is suddenly switched in, causing a small disturbance. Considering different controllable load polymer control modes, the controllable load participates in frequency modulation k f2000, controllable load participates in frequency modulation k f500 and method (k) for refrigerator not to participate in frequency adjustmentf0) and the frequency control effect thereof is compared, the result is shown in fig. 9.
As can be seen in FIG. 10, the participation of the controlled load polymer is represented by kfIn other words, the higher the participation, the more controllable loads are unloaded corresponding to the reduction of the frequency, so that the better the improvement effect on the dynamic frequency deviation is.
2) Simulation verification of source-load cooperative frequency modulation strategy
A total of four cases, Case1-Case4, were considered, as shown in Table 1:
table 1 description of the different cases
| Case | Description of the invention |
| Case1 | Controllable load participation micro-grid frequency regulation without considering comprehensive frequency modulation benefit |
| Case2 | Maximizing frequency modulation benefit considering only load |
| Case3 | Maximizing wind turbine generator frequency modulation benefit only |
| Case4 | Frequency modulation benefit maximization comprehensively considering microgrid |
The DFIG active power pair at different cases is shown in fig. 11. When only the load frequency modulation benefit (Case2) is considered, the fan output is slightly increased compared with the Case1, but the absorbed power in the corresponding speed recovery period is also correspondingly increased; when only the frequency modulation benefit maximization (Case3) of the fan is considered, compared with Case1, at the initial stage of frequency drop, the active power of the fan is more, but the increased power is more, which indicates that the energy released by the rotating speed is more, so that at the later stage of rotating speed recovery, the virtual inertia value is continuously reduced along with the frequency modulation benefit, and the condition that the fan absorbs power reversely is improved, but the effect is not obvious. When the frequency modulation benefit maximization (Case4) of the micro-grid is comprehensively considered, due to the source-load synergistic effect, the active power generated by the fan for supporting the frequency and the controllable load shedding power are matched with each other at the initial stage of frequency drop, so that the output of the fan is less than that of the Case3, the rotating speed release energy is in a proper value, and the improvement effect of the condition that the fan absorbs the power is obvious at the later stage of rotating speed recovery.
The pair of active power of the controllable load in different cases is shown in fig. 12. When the frequency modulation benefit (Case1) is not considered, the controllable load participating frequency regulation condition is that the load is rapidly reduced to the limit value, and after the frequency modulation benefit of the load is maximized (Case2), the influence of the load comfort degree needs to be considered, so that the controllable load reduction rate is higher at the initial stage of the frequency drop, the user comfort degree is extremely reduced, the controllable load reduction rate is correspondingly reduced, and the controllable load is recovered after the frequency is recovered. When the frequency modulation benefit of the fan is only considered to be maximized (Case3), the active output of the fan is increased in the initial stage of the frequency drop compared with Case1, and the load shedding power of the controllable load is slightly compensated. When the frequency modulation benefit maximization (Case4) of the micro-grid is comprehensively considered, the influence of user comfort is considered, the load shedding rate of the controllable load is flexibly changed, and meanwhile, the load shedding amount of the controllable load is kept within the load shedding limit due to the source-load synergistic effect.
The microgrid frequency dynamics in different cases are shown in fig. 13. It can be known from the figure that when only the controllable load (Case2) and the frequency modulation benefit (Case3) of the wind turbine generator are considered respectively, the improvement effect on the system frequency adjustment is poor, and when the frequency modulation benefit maximization (Case4) of the microgrid is considered comprehensively, the improvement effect on the dynamic frequency deviation is best, the dynamic frequency deviation is minimum, and the frequency can be rapidly increased.
Claims (5)
1. A micro-grid source-load dynamic frequency control method considering frequency modulation benefits is characterized by comprising the following steps:
1) obtaining the active power P of the temperature control load participating in the frequency modulation capacity and the temperature control device participating in the frequency modulationCLAnd (3) related to the start-stop temperature change value delta T of the temperature control equipment, the following steps are carried out:
wherein on% is the percentage of the temperature-controlled load in the start-up state, off% is the percentage of the temperature-controlled load in the stop state, PNRated active power, T ', consumed for temperature controlled loads'+And T'_Are respectively responsiveStarting and stopping upper and lower limit temperature values of temperature control equipment with system frequency change;
2) calculating controllable load frequency modulation benefit B considering user comfortCLControllable load frequency modulation benefit BCLThe calculation formula of (A) is as follows:
where C is user comfort, Δ PCLActive power variation value, C, for a temperature control device participating in frequency regulation0For initial user comfort, m1Is a constant value of tnowIs the current time, kfIs the user engagement coefficient, f is the system frequency at the current time, fNIs the rated frequency of the system;
3) adding virtual inertia control into the DFIG to obtain the frequency modulation capability, and obtaining the DFIG frequency modulation benefit B added with the virtual inertia controlwindDFIG frequency modulation benefit B added with virtual inertia controlwindThe calculation formula of (A) is as follows:
wherein, tonFor the start of frequency modulation, PwindFor adding active power output, P, of fan during frequency modulation after virtual inertia control0The output of the front fan is used for participating in frequency modulation;
4) comprehensive DFIG frequency modulation benefit BwindAnd controllable load frequency modulation benefit BCLAnd adjusting the source-load dynamic frequency of the microgrid.
2. The microgrid source-load dynamic frequency control method considering frequency modulation benefits as claimed in claim 1, wherein in the step 4), wind power in a microgrid is subjected to dynamic frequency controlThe unit and the temperature control load are cooperatively controlled in a centralized control mode, the total frequency modulation benefit of the system is calculated by collecting the active power and the system frequency of the controllable load and the wind turbine at the current moment, and a virtual inertia parameter K when the total frequency modulation benefit of the system is maximum is obtainedinAnd a user engagement coefficient kfAnd adjusting the source-load dynamic frequency of the microgrid.
3. The microgrid source-load dynamic frequency control method considering frequency modulation benefits as claimed in claim 2, characterized in that in the step 4), DFIG frequency modulation benefit B is synthesizedwindAnd controllable load frequency modulation benefit BCLThe objective function for carrying out the micro-grid source-load dynamic frequency adjustment is as follows:
wherein B is the total frequency modulation benefit of the system l1And l2Respectively, the weight of the frequency modulation benefit and the weight of the comfort of the controllable load,/3The frequency modulation benefit of the fan is weighted,
upper and lower limits, delta P, respectively, for the active power of the temperature control device participating in the frequency adjustment to be adjusted in unit timeLFor sudden loads in the microgrid, PLFor fixed loads, omega, in the microgridrIs the DFIG rotor speed, PGThe synchronous machine output is realized.
4. The microgrid source-load dynamic frequency control method considering frequency modulation benefits as claimed in claim 3, characterized in that in step 3), the virtual inertia parameter K is determined according to the DFIG frequency modulation benefitsinTool for measuringThe body is as follows:
wherein r is1、r2Respectively, are adjustment constants.
5. The method as claimed in claim 4, wherein the virtual inertia parameter K is a virtual inertia parameter K during a frequency ramp-up phase to reduce the virtual inertia parameter rapidly and ensure a rapid recovery of the rotation speed, so as to prevent the rotor from falling too fast in an initial frequency ramp-down phase and affecting a subsequent recoveryinThe decreasing speed is greater than the increasing speed, the constant r is adjusted1And r2The relationship of (1) is:
r2＞r1。
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