CN112994044B - Wind power plant participating inertia frequency modulation control method - Google Patents
Wind power plant participating inertia frequency modulation control method Download PDFInfo
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- CN112994044B CN112994044B CN202110307193.5A CN202110307193A CN112994044B CN 112994044 B CN112994044 B CN 112994044B CN 202110307193 A CN202110307193 A CN 202110307193A CN 112994044 B CN112994044 B CN 112994044B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a method for controlling participation of an inertia frequency modulation mode in a wind power plant, which is characterized in that an inertia frequency modulation mode is added on the basis of an EMS (energy management system) field level control system of the wind power plant, the frequency change rate value of a grid-connected point of the wind power plant is collected through an EMS, the field level inertia target power is calculated according to the frequency change rate and a droop coefficient, an inertia frequency modulation distribution algorithm is called, the target power of a single machine is calculated and a single machine control mode mark position is issued, the single machine controls the inertia frequency modulation mode to be added, the quick frequency response of the wind power plant is realized, and the requirement of field level frequency modulation is met.
Description
Technical Field
The invention relates to the technical field of wind power plants, in particular to a wind power plant participation inertia frequency modulation control method.
Background
The existing wind power plant EMS field level control system mainly comprises two control modes, namely a normal AGC control mode and a primary frequency modulation control mode, under the AGC control mode, an EMS receives a field level power control target issued by AGC, invokes an AGC distribution algorithm, calculates the target power of each single machine and issues the target power to the single machine; under a primary frequency modulation control mode, the EMS calculates field level target power according to the frequency deviation and the droop coefficient, calls a primary frequency modulation distribution algorithm, calculates the target power of each single machine and sends the target power to the single machine; after the single machine receives the field-level control target, the single machine is regulated through rotating speed or variable pitch, and the regulating speed of the single machine is generally about 50 kW/s.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for adjusting the inertia frequency of a wind power plant.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a wind power plant participation inertia frequency modulation control method is characterized in that an inertia frequency modulation mode is added on the basis of an EMS (energy management system) field level control system of a wind power plant, the frequency change rate value of a grid-connected point of the wind power plant is collected through an EMS, field level inertia target power is calculated according to the frequency change rate, an inertia frequency modulation distribution algorithm is called, the target power of a single machine is calculated, a single machine control mode flag bit is issued, and the single machine controls the inertia frequency modulation mode to be added so as to meet the field level frequency modulation requirement; which comprises the following steps:
1) Field level control
Acquiring the frequency change rate of a wind power plant grid-connected point through an EMS platform real-time acquisition device, wherein the frequency change rate is
Greater than the upper threshold df + Or less than the lower threshold value df — Starting inertia frequency modulation mode, active power variation quantity delta P inner The calculation formula is as follows:
wherein, T J An inertia time constant is set as a changeable variable; f. of N Is a power frequency;
acquiring the frequency change rate by an acquisition device; p is N Rated power for the wind farm;
for active power variation quantity delta P inner Clipping is performed to (factor _ low) inner *P N ，factor_high inner P N )，
Wherein, factor _ low inner Setting the lower limit coefficient as a changeable variable; factor _ high inner Setting the upper limit coefficient of the amplitude limit as a changeable variable;
the field level inertia target power PGref is calculated according to the following formula,
PGref＝P 0 +△P inner
wherein, P 0 A wind farm initial power value locked for entering an inertia mode;
2) Allocation strategy
Obtaining the target power Piref and the control mode flag of the single machine by calling an inertia frequency modulation distribution algorithm and sending the target power Piref and the control mode flag to the single machine; the specific process is as follows:
2.1 The field level inertia target power PGref is obtained according to the calculation of the step 1);
2.2 The real-time power Pmean _ sum of the whole wind field is counted, and the difference value delta Pf = PGref-Pmean _ sum of the target power value and the actual power of the wind field is calculated;
2.3 If delta Pf is more than 100, calling an inertia increasing function to distribute the power increasing, calculating the target power Piref of the single machine and issuing a control mode flag bit flag; if the delta Pf is < -100, calling a inertia reduction function to carry out power reduction distribution, calculating the single-machine target power Piref and issuing a control mode flag bit flag; if delta Pf is more than or equal to-100 and less than or equal to 100, maintaining the target power and the single-machine control mode in the last period, wherein Piref = Piref _1, and flag = flag \u1; wherein, piref represents a power target value distributed to the stand-alone, flag represents a power control mode issued to the stand-alone, piref _1 represents a power target value issued to the stand-alone in an up-cycle, and flag _1 represents a control mode issued to the stand-alone in an up-cycle;
the power reduction distribution specifically comprises the following steps: the single machines are divided into controllable single machines and uncontrollable single machines, only the controllable single machines are operated, the controllable single machines are grouped according to states and are placed into corresponding queues, the power reduction capability of all the single machines in each queue is counted, the total power value distributed by the single machines in each queue is respectively calculated, and then the power distribution is carried out on the single machines in each queue;
the distribution of the power per liter is specifically as follows: the single machines are divided into controllable single machines and uncontrollable single machines, only the controllable single machines are operated, the controllable single machines are grouped according to states and are placed into corresponding queues, the power increasing capacity of all the single machines in each queue is counted, the total power value distributed by the single machines in each queue is respectively calculated, and then the power distribution is carried out on the single machines in each queue;
2.4 Sending the output power target value and the control mode flag bit to a single machine;
3) Stand-alone response
The single machine receives the target power Piref and the control mode flag in the step 2); when flag =1, the stand-alone enters the inertia modulation mode, the power is rapidly raised or lowered by the torque control, and the stand-alone can accomplish 10% pin power rapid response within a set time; when flag =0, the single machine enters a normal power regulation mode, and the response speed of the single machine is within a set speed range.
Further, in step 2.3), the power down allocation includes the following steps:
2.3.1.1 A single machine is divided into a controllable single machine and an uncontrollable single machine, and only the controllable single machine is operated;
2.3.1.2 For a controllable stand-alone machine, dividing the controllable stand-alone machine into a stand-alone machine in inertia frequency modulation, a stand-alone machine which is not in inertia but has inertia capability and a stand-alone machine which cannot perform inertia frequency modulation at present according to the state of the stand-alone machine, setting the stand-alone type of the stand-alone machine in inertia frequency modulation and putting the stand-alone machine into an InerInDFIG queue, setting the stand-alone type of the stand-alone machine which is not in inertia but has inertia capability and putting the stand-alone machine into an InerOutDFIG queue, and setting the stand-alone type of the stand-alone machine which cannot perform inertia frequency modulation at present and putting the stand-alone DFIG queue;
2.3.1.3 The total power reduction capability of the single machines in the InerInDFIG queue in the inertia frequency modulation is P1_ decr, and the total power reduction capability of the single machines in the InerInDFIG queue which is not in the inertia but has the inertia capability is P2_ decr;
2.3.1.4 Respectively calculate the total power value of the single machine allocation of each queue
If the < DELTA > Pf < DELTA > is less than or equal to P1_ decr, which indicates that the requirement can be met only by performing power reduction operation on a single machine in the inertia frequency modulation, P _ iner _ decr = < DELTA > Pf < DELTA >, P _ inerout _ decr =0, P _pitch \ decr =0, wherein the < DELTA > Pf < DELTA > represents the absolute value of the difference value < DELTA > Pf between the target power value and the actual power of the wind field, and the P _ iner _ decr represents the total power reduction target value of the InernInDFIG queue; p _ inerout _ decr represents the total power down target value of the InerOutDFIG queue; p _ pitch _ decr represents the total derate target value of the PitchDFIG queue;
if P1_ decr < | delta Pf | ≦ P1_ decr + P2_ decr, which indicates that power distribution needs to be performed on the InerInDFIG and InerOutDFIG units, P _ iner _ decr = P1_ decr, P _ inerout _ decr = | delta Pf | -P1_ decr, and P _ pitch _ decr =0;
if the target P1_ decr + P2_ decr < | Δ Pf |, which indicates that the stand-alone inertia capability is insufficient, and the remaining power is performed by the PitchDFIG fleet stand-alone pitch operation, P _ input _ decr = P1_ decr, P _ inout _ decr = P2_ decr, P _ pitch _ decr = | Δ Pf | -P1_ decr-P2_ decr;
2.3.1.5 Power allocation to individual machines in each queue
When P _ inerin _ decr >0, performing inertia distribution on the InerInDFIG queue stand-alone;
when P _ inolout _ decr >0, carrying out inertia distribution on a single machine in the IneruOutDFIG queue;
when P _ pitch _ decr >0, the allocation of single-ended power to the PitchDIG queue occurs.
Further, in step 2.3), the step of allocating the power per liter includes the following steps:
2.3.2.1 Dividing the single machine into a controllable single machine and an uncontrollable single machine, and only operating the controllable single machine;
2.3.2.2 For a controllable stand-alone machine, dividing the controllable stand-alone machine into a stand-alone machine in inertia frequency modulation, a stand-alone machine which is not in inertia but has inertia capability and a stand-alone machine which cannot perform inertia frequency modulation at present according to the state of the stand-alone machine, setting the stand-alone type of the stand-alone machine in inertia frequency modulation and putting the stand-alone machine into an InerInDFIG queue, setting the stand-alone type of the stand-alone machine which is not in inertia but has inertia capability and putting the stand-alone machine into an InerOutDFIG queue, and setting the stand-alone type of the stand-alone machine which cannot perform inertia frequency modulation at present and putting the stand-alone DFIG queue;
2.3.2.3 The total power-up capacity of the single machines in the InerInDFIG queue in inertia adjustment is P1_ incr, and the total power-up capacity of the single machines in the InerInDFIG queue which is not in inertia but has inertia capacity is P2_ incr;
2.3.2.4 Respectively calculate the total power value of the single machine allocation of each queue
If Δ Pf ≦ P1_ incr, meaning that only boost operation on the stand-alone being inertia adjusted is needed to meet the requirement, P _ iner _ incr =Δpf, P _ inerout _ incr =0, P _pitch _incr =0, where Δ Pf represents the difference between the target power value and the actual power of the wind farm, and P _ iner _ incr represents the total power-up target value of the inerlndfig queue; p _ inerout _ incr represents the total boosted power target value of the InerOutDFIG queue; p _ pitch _ incr represents the total up power target value of the PitchDFIG queue;
if P1_ incr <. DELTA Pf is less than or equal to P1_ incr + P2_ incr, which indicates that power distribution needs to be carried out on InerInDFIG and InerOutDFIG single units, P _ incr = P1_ incr, P _ inout _ incr = DELTA Pf-P1_ incr, and P _ pitch _ incr =0;
if P1_ incr + P2_ incr <. DELTA.Pf, indicating that the stand-alone inertia capability is insufficient and the remaining power is being performed by the PitchDFIG fleet stand-alone pitch operation, P _ incr = P1_ incr, P _ inorout _ incr = P2_ incr, P _ pitch _ incr =. DELTA.Pf-P1 _ incr-P2_ incr;
2.3.2.5 Power allocation to individual machines in each queue
When P _ iner _ incr >0, performing inertia distribution on the InerInDFIG queue stand-alone;
when P _ inolout _ incr >0, performing inertia distribution on a single machine in the InerOutDFIG queue;
when P _ pitch _ incr >0, the allocation of single-ended power to the pitchDIG queue.
Further, in step 2.3.1.3), the method for calculating the total power reduction capability P1_ decr of the individual units in the iner dfig queue is as follows:
the platform records initial power Pi0 of the single machine entering frequency modulation, sets the power of the single machine participating in inertia frequency modulation as w _ PiN _ Pin, wherein Pin is the rated power of the single machine, the lower limit value of the power of the single machine inertia frequency modulation is Pin _ low = Pi0-w _ PiN _ Pin, w _ PiN is a settable variable, compares Pin _ low with Pimin, pimin is the minimum value of power adjustment, defaults to 0.1Pin, the larger value between the two is taken as the lower limit value of inertia frequency modulation, and sets the final lower limit value of power adjustment Pin _ min, pin _ min = max (Pin _ low, pimin), so that the inertia residual capacity of the single machine is Pin _ decr, pin _ decr = Pimea-Pin _ min, and the inertia residual capacity of the single machine in all inertia frequency modulation is: p1_ decr = ∑ Pire _ decr;
the method for calculating the total power reduction capability P2_ decr of the InerInDFIG queue single machine is as follows:
the method comprises the steps of collecting an inertia Flag _ ctrl, the actual active power Pimea and the rotating speed Wimea of a single machine, and enabling the single machine to enter an inertia frequency modulation mode when the single machine simultaneously meets the four conditions of Flag _ ctrl = =1, pimea > < w \ min x Pin, wimea > < Wimin and Wimea < Wimax, wherein w _ min is 0.2, which means that only the single machine with the power higher than 20 Pin can enter inertia adjustment, wimin represents the lower limit value of the rotating speed, and Wimax represents the upper limit value of the rotating speed;
the lower inertia limit value is Piner _ low = Pimea-w _ PiN + Pin, piner _ low and Pimin are compared, the larger of the two is the final lower limit value Piner _ min, piner _ min = max (Piner _ low, pimin), the inertia frequency modulation capability of the single machine is Piner _ decr, piner _ decr = Pimea-Piner _ min, the inertia modulation capability of all single machines which are not in the inertia but have the inertia capability and is P2_ decr = ∑ Piner _ decr.
Further, in step 2.3.1.5), the method for distributing the inertia of the inerldfig single machine is as follows:
the distribution principle is as follows: all InerInDFIG single machines participate in the process and are distributed according to the principle of similarity margin so as to reduce the variation of a single machine, and the distribution formula is as follows: dPiset _ decr = pin _ decr/P1_ decr × P _ inner _ decr, where dPiset _ decr represents the power required to be reduced by the stand-alone inertia, and the stand-alone target power is Piref = Pimea-dPiset _ decr;
the IneruOutDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: the method comprises the steps that a single machine is provided with a protection system, the single machine exits an inertia frequency modulation mode due to the fact that inertia adjustment amount is too large or current wind speed is insufficient, after the single machine exits the inertia mode, a period of time is needed for restoring the rotating speed, the single machine cannot adjust inertia in the restoring period until the restoring time is reached, the single machine cannot adjust inertia in a new round, in an IneruOutDFIG single machine queue which does not enter inertia adjustment and has inertia capacity, power reduction coefficients Cisub and Cisub = (Pimea-Pimin)/Pin of all the single machines are calculated firstly, then the single machines are sorted from large to small according to the Cisub, and the single machines are sequentially selected for inertia adjustment until the inertia requirement is met;
the PitchDFIG stand-alone power allocation method is as follows: and for the single machine which cannot perform inertia adjustment, calling a primary frequency modulation function to distribute power.
Further, in step 2.3.2.3), the calculation method of the total power-up capability P1_ incr of the inderdfeg queue is as follows:
the platform records the initial power Pi0 of the single machine entering the frequency modulation, the power of the single machine participating in the inertia adjustment is set to be w _ Pin & ltPin & gt, wherein Pin is the rated power of the single machine, the upper limit value of the power of the single machine inertia adjustment is Piner _ upper, piner _ upper = Pi0+ w _ Pin & ltPin & gt, wherein w _ Pin is a settable variable, the Piner _ upper and Pin are compared, the smaller value between the Piner _ upper and Pin is used as the upper limit value of the inertia adjustment, the maximum value Piner _ max of the power adjustment is set, namely Piner _ max = min (Pin _ upper, pin), the residual inertia capability of the single machine is Pire _ incr, pire _ incr = Piner _ max-Pimea, and the residual inertia capability of the single machine in all the inertia adjustments is: p1_ incr =Σpire _ incr;
the method for calculating the total power-up capacity P2_ incr of the IneruOutDFIG queue single machine is as follows:
the method comprises the steps that an inertia Flag _ ctrl, the actual active power Pimea and the rotating speed Wimea of a single machine are collected, when the single machine which simultaneously meets the four conditions of Flag _ ctrl =1, pimea = w \\ u \ min Pin, wimea >and Wimea < Wimax has inertia capability, the single machine can enter an inertia frequency modulation mode, wherein w _ min is 0.2, which means that only the single machine with the power higher than 20 PiN can enter inertia adjustment, wimin represents a lower limit value of the rotating speed, and Wimax represents an upper limit value of the rotating speed;
the upper inertia value is Piner _ up, piner _ up = Pimea + w _ PiN + Pin, and the smaller of Piner _ up and Pin is compared to the upper inertia adjustment value Piner _ max, i.e. Piner _ max = min (Piner _ up, pin), then the inertia adjustment capability of the stand-alone is Piner _ incr, piner _ incr = Piner _ max-Pimea, the inertia adjustment capability of all stand-alone machines which are not in inertia but have inertia capability and is P2_ incr = ∑ Piner _ incr.
Further, in step 2.3.2.5), the inerldfig stand-alone inertia distribution method is as follows:
the distribution principle is as follows: all InerInDFIG single machines participate in the process and are distributed according to the principle of similarity margin so as to reduce the variation of a single machine, and the distribution formula is as follows: dPiset _ incr = needle _ incr/P1_ incr × P _ inner _ incr, where dPiset represents the power required to be boosted by a single machine inertia, and then the single machine target power is Piref = Pimea + dPiset _ incr;
the IneruOutDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: the method comprises the steps that a single machine is provided with a protection system, the single machine exits an inertia frequency modulation mode due to the fact that inertia adjustment amount is too large or current wind speed is insufficient, after the single machine exits the inertia mode, the rotating speed needs to be recovered for a period of time, the single machine cannot perform inertia adjustment in the recovery period of time until the recovery time is reached, the single machine cannot perform a new round of inertia adjustment, in an IneruDrDFIG single machine queue which does not enter inertia adjustment and has inertia capacity, the rising power coefficient Ciadd = (Pimax-Pimea)/Pin of all the single machines is calculated firstly, wherein Pimax represents single machine prediction power, then sorting from large to small is performed according to Ciadd, and then the single machines are sequentially selected to perform inertia adjustment until inertia requirements are met;
the PitchDFIG stand-alone power allocation method is as follows: and for the single machine which cannot perform inertia adjustment, calling a primary frequency modulation function to distribute power.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method, the inertia frequency modulation mode is added in the EMS energy management system, the wind power plant frequency modulation transformation can be completed only by modifying the field level and the single machine control algorithm without adding extra hardware cost, the single machine can complete the power response of 10% Pin within 500ms after the inertia frequency modulation mode is added, and the response speed is high. And when the single machine detects that the inertia frequency modulation mode cannot be continuously carried out in the single machine, the single machine can exit the inertia mode and automatically carry out power recovery, so that the reliability of the single machine is improved, and the shutdown or instability of the single machine is avoided. When one stand-alone machine exits from the inertia frequency modulation mode and the power drops rapidly, the rest stand-alone machines can enter the inertia frequency modulation mode rapidly to supplement the power rapidly, and the secondary drop of the power is prevented.
Drawings
Fig. 1 is a diagram of a field level control architecture of the present invention.
Fig. 2 is a flow chart of an inertia frequency modulation distribution algorithm of the present invention.
Fig. 3 is a flow chart of the power down allocation of the present invention.
Fig. 4 is a flow chart of the power-up distribution of the present invention.
Detailed Description
The present invention is further illustrated by the following examples.
According to the wind power plant participation inertia frequency modulation control method provided by the embodiment, an inertia frequency modulation mode is added on the basis of an EMS (energy management system) field level control system of a wind power plant, the frequency change rate value of a grid-connected point of the wind power plant is collected through the EMS, the field level inertia target power is calculated according to the frequency change rate and a droop coefficient, an inertia frequency modulation distribution algorithm is called, the target power of a single machine is calculated and a single machine control mode flag bit is issued, and the single machine control increases the inertia frequency modulation mode. For example, when the control mode is the pitch control mode, the regulation speed is about 50kW/s, and when the inertia frequency modulation mode is entered, the power can be 10% in the Pin power response (wherein Pin is the rated power of the fan) within 500ms, so as to meet the requirement of field level frequency modulation. Which comprises the following steps:
1) Field level control
Acquiring the frequency change rate of a wind power plant grid-connected point through an EMS platform real-time acquisition device, wherein the frequency change rate is
Is greater than the upper threshold df + Or less than the lower threshold value df — Starting inertia frequency modulation mode, active power variation quantity delta P inner The calculation formula is as follows:
wherein, T J Setting the inertia time constant as 10s as a changeable variable; f. of N Is the frequency of the power frequency,the value is 50Hz;
acquiring the frequency change rate by an acquisition device; p N Rated power for the wind farm;
for active power variation quantity delta P inner Clipping is performed to (factor _ low) inner *P N ，factor_high inner P N )，
Wherein, factor _ low inner The amplitude limiting lower limit coefficient is set as-0.1 and is set as a changeable variable; factor _ high inner The amplitude limiting upper limit coefficient is set to be 0.1 and set as a changeable variable;
the field-level inertia target power PGref is calculated according to the following formula, and ctrl mode is set to 3,
PGref＝P 0 +△P inner
wherein, P 0 A wind farm initial power value locked for entering an inertia mode;
the field level structure is shown in fig. 1.
2) Allocation strategy
Obtaining the target power Piref and the control mode flag of the single machine by calling an inertia frequency modulation distribution algorithm and sending the target power Piref and the control mode flag to the single machine; as shown in fig. 2, the specific process is as follows:
2.1 ) calculating the field-level inertia target power PGref according to the step 1), and setting CtrlMode to 3;
2.2 The real-time power Pmean _ sum of the whole wind field is counted, and the difference value delta Pf = PGref-Pmean _ sum of the target power value and the actual power of the wind field is calculated;
2.3 If delta Pf is more than 100, calling an inertia increasing function to distribute the power increasing, calculating the target power Piref of the single machine and issuing a control mode flag bit flag; if the delta Pf is < -100, calling a inertia reduction function to carry out power reduction distribution, calculating the single-machine target power Piref and issuing a control mode flag bit flag; if delta Pf is more than or equal to-100 and less than or equal to 100, maintaining the target power and the single-machine control mode in the last period, wherein Piref = Piref _1, and flag = flag \u1; wherein Piref represents a power target value distributed to the single machine, flag represents a power control mode issued to the single machine, piref _1 represents a power target value issued to the single machine in an up period, and flag _1 represents a control mode issued to the single machine in the up period;
the power reduction distribution specifically comprises the following steps: the single machines are divided into controllable single machines and uncontrollable single machines, only the controllable single machines are operated, the controllable single machines are grouped according to states and are placed into corresponding queues, the power reduction capability of all the single machines in each queue is counted, the total power value distributed by the single machines in each queue is respectively calculated, and then the power distribution is carried out on the single machines in each queue;
the flow chart is shown in fig. 3, and specifically includes the following steps:
2.3.1.1 The single machine is divided into a controllable single machine and an uncontrollable single machine, and fans of the types such as a benchmark fan, a communication fault or a single machine fault do not respond power and only operate the controllable single machine.
2.3.1.2 For the controllable single machine, the single machines are divided into a single machine in inertia frequency modulation, a single machine which is not in inertia but has inertia capability and a single machine which cannot currently perform inertia frequency modulation according to the state of the single machine, the type of the single machine in the inertia frequency modulation is set as type1, the single machine is placed into an InerInDFIG queue, the type of the single machine which is not in inertia but has inertia capability is set as type2, the single machine is placed into an InerOutDFIG queue, the type of the single machine which cannot currently perform inertia frequency modulation is set as type3, and the single machine is placed into a PitchDFIG queue.
2.3.1.3 The total power reduction capability of the single machines in the InerInDFIG queue in the inertia frequency modulation is P1_ decr, and the total power reduction capability of the single machines in the InerInDFIG queue which is not in the inertia but has the inertia capability is P2_ decr;
the method for calculating the total power reduction capacity P1_ decr of the InerInDFIG queue single machine comprises the following steps:
the platform records the initial power Pi0 of the single machine entering the frequency modulation, the power of the single machine participating in the inertia frequency modulation is set to be w _ PiN & Pin, wherein Pin is the rated power of the single machine, the lower limit value of the power of the single machine inertia frequency modulation is Piner _ low = Pi0-w _ PiN & Pin, w _ PiN is a settable variable (default value is 0.1), piner _ low is compared with Pimin, pimin is the minimum value of power adjustment and is default value of 0.1Pin, the larger value between the two is used as the lower limit value of the inertia frequency modulation and is set as the final lower limit value of power adjustment, piner _ min = max (Piner _ low, pimin), the inertia residual capacity of the single machine is Pire _ decr, pire _ decr = Pimea-Piner _ min, and the residual inertia capacity of the single machine in all inertia frequency modulation is: p1_ decr = ∑ Pire _ decr;
the method for calculating the total power reduction capability P2_ decr of the InerInDFIG queue single machine is as follows:
the method comprises the steps of collecting an inertia Flag _ ctrl, the actual active power Pimea and the rotating speed Wimea of a single machine, and enabling the single machine to enter an inertia frequency modulation mode when the single machine simultaneously meets the four conditions of Flag _ ctrl = =1, pimea > < w \ min x Pin, wimea > < Wimin and Wimea < Wimax, wherein w _ min is 0.2, which means that only the single machine with the power higher than 20 Pin can enter inertia adjustment, wimin represents the lower limit value of the rotating speed, and Wimax represents the upper limit value of the rotating speed;
the lower inertia limit value is Piner _ low = Pimea-w _ PiN + Pin, piner _ low and Pimin are compared, the larger of the two is the final lower limit value Piner _ min, piner _ min = max (Piner _ low, pimin), the inertia frequency modulation capability of the single machine is Piner _ decr, piner _ decr = Pimea-Piner _ min, the inertia modulation capability of all single machines which are not in the inertia but have the inertia capability and is P2_ decr = ∑ Piner _ decr.
2.3.1.4 Respectively calculate the total power value of the single machine allocation of each queue
If the < DELTA > Pf < DELTA > is less than or equal to P1_ decr, which indicates that the requirement can be met only by performing power reduction operation on a single machine in the inertia frequency modulation, P _ iner _ decr = < DELTA > Pf < DELTA >, P _ inerout _ decr =0, P _pitch \/decr =0, wherein the < DELTA > Pf < DELTA > represents the absolute value of the difference value of the target power value and the actual power of the wind field, namely the < DELTA > Pf; p _ inerin _ decr represents the total derate target value of the InerInDFIG queue; p _ inerout _ decr represents the total power down target value of the InerOutDFIG queue; p _ pitch _ decr represents the total derate target value of the PitchDFIG queue;
if P1_ decr < | delta Pf | ≦ P1_ decr + P2_ decr, which indicates that power distribution needs to be performed on InerInDFIG and InerOutDFIG single machines, P _ iner _ decr = P1_ decr, P _ inerout _ decr = | -delta Pf | -P1_ decr, and P _ pitch _ decr =0;
if the target P1_ decr + P2_ decr < | Δ Pf |, indicates that the stand-alone inertia capability is insufficient and the remaining power is performed by the pitch dfig fleet stand-alone pitch operation, P _ input _ decr = P1_ decr, P _ inout _ decr = P2_ decr, P _ pitch _ decr = | - Δ Pf | -P1_ decr-P2_ decr.
2.3.1.5 Power allocation to individual machines in each queue
When P _ inerin _ decr >0, performing inertia distribution on the InerInDFIG queue stand-alone;
when P _ inolout _ decr >0, carrying out inertia distribution on a single machine in the IneruOutDFIG queue;
when P _ pitch _ decr >0, the allocation of single-ended power to the PitchDIG queue occurs.
The InerInDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: all InerInDFIG single machines participate in the process and are distributed according to the principle of similarity margin so as to reduce the variation of a single machine, and the distribution formula is as follows: dPiset _ decr = pin _ decr/P1_ decr × P _ inner _ decr, where dPiset _ decr represents the power required to be reduced by the stand-alone inertia, and the stand-alone target power is Piref = Pimea-dPiset _ decr;
the IneruOutDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: the method comprises the steps that a single machine is provided with a protection system, the single machine exits an inertia frequency modulation mode due to the fact that inertia adjustment amount is too large or current wind speed is insufficient, after the single machine exits the inertia mode, a period of time is needed for restoring the rotating speed, the single machine cannot adjust inertia in the restoring period until the restoring time is reached, the single machine cannot adjust inertia in a new round, in an IneruOutDFIG single machine queue which does not enter inertia adjustment and has inertia capacity, power reduction coefficients Cisub and Cisub = (Pimea-Pimin)/Pin of all the single machines are calculated firstly, then the single machines are sorted from large to small according to the Cisub, and the single machines are sequentially selected for inertia adjustment until the inertia requirement is met;
the PitchDFIG stand-alone power allocation method is as follows: and calling a primary frequency modulation function to distribute power for the single machine which cannot carry out inertia adjustment.
The distribution of the power per liter is specifically as follows: the single machines are divided into controllable single machines and uncontrollable single machines, only the controllable single machines are operated, the controllable single machines are grouped according to states and are placed into corresponding queues, the power increasing capacity of all the single machines in each queue is counted, the total power value distributed by the single machines in each queue is respectively calculated, and then the power distribution is carried out on the single machines in each queue;
the flow chart is shown in fig. 4, and specifically includes the following steps:
2.3.2.1 Divide the single machine into a controllable single machine and an uncontrollable single machine, and operate only the controllable single machine.
2.3.2.2 For the controllable single machine, the single machines are divided into a single machine in inertia frequency modulation, a single machine which is not in inertia but has inertia capability and a single machine which cannot currently perform inertia frequency modulation according to the state of the single machine, the type of the single machine in the inertia frequency modulation is set as type1, the single machine is placed into an InerInDFIG queue, the type of the single machine which is not in inertia but has inertia capability is set as type2, the single machine is placed into an InerOutDFIG queue, the type of the single machine which cannot currently perform inertia frequency modulation is set as type3, and the single machine is placed into a PitchDFIG queue.
2.3.2.3 The total power-up capacity of the single machines in the InerInDFIG queue in inertia adjustment is P1_ incr, and the total power-up capacity of the single machines in the InerInDFIG queue which is not in inertia but has inertia capacity is P2_ incr;
the method for calculating the total power capacity P1_ incr of the InerInDFIG queue single machine is as follows:
the platform records the initial power Pi0 of the single machine entering frequency modulation, the power of the single machine participating in inertia adjustment is set to be w _ Pin & ltPin & gt, wherein Pin is the rated power of the single machine, the upper limit value of the power of the inertia adjustment of the single machine is Pin _ upper, pin _ upper = Pi0+ w _ Pin & ltPin & gt, w _ Pin is a settable variable (default value is 0.1), the Pin _ upper and the Pin are compared, the smaller value between the Pin _ upper and the Pin is used as the upper limit value of the inertia adjustment, the maximum value Pin _ max of the power adjustment is set, namely Pin _ max = min (Pin _ upper, pin), the residual inertia capacity of the single machine is Pin _ incr, pin _ incr = Pin _ max-Pimea, and the residual inertia capacity of the single machine in all the inertia adjustment is: p1_ incr =Σpire _ incr;
the method for calculating the total power-up capacity P2_ incr of the IneruOutDFIG queue single machine is as follows:
the method comprises the steps that an inertia Flag _ ctrl, the actual active power Pimea and the rotating speed Wimea of a single machine are collected, when the single machine which simultaneously meets the four conditions of Flag _ ctrl =1, pimea = w \\ u \ min Pin, wimea >and Wimea < Wimax has inertia capability, the single machine can enter an inertia frequency modulation mode, wherein w _ min is 0.2, which means that only the single machine with the power higher than 20 PiN can enter inertia adjustment, wimin represents a lower limit value of the rotating speed, and Wimax represents an upper limit value of the rotating speed;
the upper inertia value is Piner _ up, piner _ up = Pimea + w _ PiN + Pin, and the smaller of Piner _ up and Pin is compared to the upper inertia adjustment value Piner _ max, i.e. Piner _ max = min (Piner _ up, pin), then the inertia adjustment capability of the stand-alone is Piner _ incr, piner _ incr = Piner _ max-Pimea, the inertia adjustment capability of all stand-alone machines which are not in inertia but have inertia capability and is P2_ incr = ∑ Piner _ incr.
2.3.2.4 Respectively calculate the total power value of the single machine allocation of each queue
If delta Pf is less than or equal to P1_ incr, which indicates that the requirement can be met only by performing power-up operation on a single machine in inertia adjustment, P _ iner _ incr =deltaPf, P _ inerout _ incr =0, P _pitch _ incr =0, wherein delta Pf represents the difference value between the target power value and the actual power of the wind field, and P _ iner _ incr represents the total power-up target value of the InernDFIG queue; p _ inerout _ incr represents the total boosted power target value of the InerOutDFIG queue; p _ pitch _ incr represents the total up-power target value of the PitchDFIG queue;
if P1_ incr <. DELTA Pf is less than or equal to P1_ incr + P2_ incr, which indicates that power distribution needs to be carried out on InerInDFIG and InerOutDFIG single units, P _ incr = P1_ incr, P _ inout _ incr = DELTA Pf-P1_ incr, and P _ pitch _ incr =0;
if P1_ incr + P2_ incr <. DELTA.Pf, indicating that the stand-alone inertia capability is insufficient and the remaining power is being performed by the PitchDFIG fleet stand-alone pitch operation, P _ inner _ incr = P1_ incr, P _ inorrout _ incr = P2_ incr, P _ pitch _ incr =. DELTA.Pf-P1 _ incr-P2_ incr.
2.3.2.5 Power allocation to individual machines in each queue
When P _ iner _ incr >0, performing inertia distribution on the InerInDFIG queue stand-alone;
when P _ inolout _ incr >0, carrying out inertia distribution on a single machine in an IneruOutDFIG queue;
when P _ pitch _ incr >0, the allocation of single-ended power to the pitchDIG queue.
The InerInDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: all InerInDFIG single machines participate in the process and are distributed according to the principle of similarity margin so as to reduce the variation of a single machine, and the distribution formula is as follows: dPiset _ incr = Piner _ incr/P1_ incr × P _ inner _ incr, where dPiset denotes the power required to be increased by the stand-alone inertia, and the stand-alone target power is Piref = Pimea + dPiset _ incr;
the IneruOutDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: the method comprises the steps that a single machine is provided with a protection system, the single machine exits an inertia frequency modulation mode due to the fact that inertia adjustment amount is too large or current wind speed is insufficient, after the single machine exits the inertia mode, the rotating speed needs to be recovered for a period of time, the single machine cannot perform inertia adjustment in the recovery period of time until the recovery time is reached, the single machine cannot perform a new round of inertia adjustment, in an IneruDrDFIG single machine queue which does not enter inertia adjustment and has inertia capacity, the rising power coefficient Ciadd = (Pimax-Pimea)/Pin of all the single machines is calculated firstly, wherein Pimax represents single machine prediction power, then sorting from large to small is performed according to Ciadd, and then the single machines are sequentially selected to perform inertia adjustment until inertia requirements are met;
the PitchDFIG stand-alone power allocation method is as follows: and calling a primary frequency modulation function to distribute power for the single machine which cannot carry out inertia adjustment.
2.4 The output power target value and the control mode flag bit are sent to the single machine.
3) Stand-alone response
The single machine receives the target power Piref and the control mode flag in the step 2); when flag =1, the stand-alone enters the inertia modulation mode, the power is rapidly raised or lowered by the torque control, and the stand-alone can accomplish 10% pin power fast response within 500 ms; when the flag =0, the single machine enters a normal power regulation mode, and the response speed of the single machine is about 50 kW/s.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (7)
1. A wind power plant participation inertia frequency modulation control method is characterized in that an inertia frequency modulation mode is added on the basis of an EMS field level control system of a wind power plant, an EMS acquires a frequency change rate value of a grid-connected point of the wind power plant, field level inertia target power is calculated according to the frequency change rate, an inertia frequency modulation distribution algorithm is called, the target power of a single machine is calculated and a single machine control mode flag bit is issued, and the single machine control increases the inertia frequency modulation mode so as to meet the field level frequency modulation requirement; which comprises the following steps:
1) Field level control
Acquiring the frequency change rate of a wind power plant grid-connected point through an EMS platform real-time acquisition device, wherein the frequency change rate is
Greater than the upper threshold df + Or less than the lower threshold value df — Starting inertia frequency modulation mode, active power variation quantity delta P inner The calculation formula is as follows:
wherein, T J When it is inertialAn inter constant set as a changeable variable; f. of N Is the power frequency;
acquiring the frequency change rate by an acquisition device; p N Rated power for the wind farm;
for active power variation quantity delta P inner Clipping is performed to (factor _ low) inner *P N ，factor_high inner P N )，
Wherein, factor _ low inner Setting the coefficient as a changeable variable for the lower limit of amplitude limiting; factor _ high inner Setting the upper limit coefficient of the amplitude limit as a changeable variable;
the field level inertia target power PGref is calculated according to the following formula,
PGref＝P 0 +△P inner
wherein, P 0 A wind farm initial power value locked for entering an inertia mode;
2) Allocation strategy
Obtaining the target power Piref and the control mode flag of the single machine by calling an inertia frequency modulation distribution algorithm and sending the target power Piref and the control mode flag to the single machine; the specific process is as follows:
2.1 The field level inertia target power PGref is obtained through calculation according to the step 1);
2.2 The real-time power Pmean _ sum of the whole wind field is counted, and the difference value delta Pf = PGref-Pmean _ sum of the target power value and the actual power of the wind field is calculated;
2.3 If delta Pf is more than 100, calling an inertia increasing function to distribute the power increasing, calculating the target power Piref of the single machine and issuing a control mode flag bit flag; if the delta Pf is < -100, calling a inertia reduction function to carry out power reduction distribution, calculating the single-machine target power Piref and issuing a control mode flag bit flag; if delta Pf is more than or equal to-100 and less than or equal to 100, maintaining the target power and the single-machine control mode in the last period, wherein Piref = Piref _1, and flag = flag \u1; wherein Piref represents a power target value distributed to the single machine, flag represents a power control mode issued to the single machine, piref _1 represents a power target value issued to the single machine in an up period, and flag _1 represents a control mode issued to the single machine in the up period;
the power reduction distribution specifically comprises the following steps: the single machines are divided into controllable single machines and uncontrollable single machines, only the controllable single machines are operated, the controllable single machines are grouped according to states and are placed into corresponding queues, the power reduction capability of all the single machines in each queue is counted, the total power value distributed by the single machines in each queue is respectively calculated, and then the power distribution is carried out on the single machines in each queue;
the distribution of the power per liter is specifically as follows: the single machines are divided into controllable single machines and uncontrollable single machines, only the controllable single machines are operated, the controllable single machines are grouped according to states and are placed into corresponding queues, the power increasing capacity of all the single machines in each queue is counted, the total power value distributed by the single machines in each queue is respectively calculated, and then the power distribution is carried out on the single machines in each queue;
2.4 Sending the output power target value and the control mode flag bit to a single machine;
3) Stand-alone response
The single machine receives the target power Piref and the control mode flag in the step 2); when flag =1, the single machine enters an inertia frequency modulation mode, the power is rapidly increased or reduced through torque control, and the single machine can complete 10% Pin power rapid response within a set time; when flag =0, the single machine enters a normal power regulation mode, and the response speed of the single machine is within a set speed range.
2. The wind farm participant inertia frequency modulation control method according to claim 1, characterized by: in step 2.3), the power down allocation comprises the following steps:
2.3.1.1 Dividing the single machine into a controllable single machine and an uncontrollable single machine, and only operating the controllable single machine;
2.3.1.2 For a controllable stand-alone, dividing the controllable stand-alone into a stand-alone in inertia frequency modulation, a stand-alone which is not in inertia but has inertia capability and a stand-alone which cannot perform inertia frequency modulation at present according to the state of the stand-alone, setting the stand-alone type of the stand-alone in inertia frequency modulation and putting the stand-alone in an InerInDFIG queue, setting the stand-alone type of the stand-alone which is not in inertia but has inertia capability and putting the stand-alone type of the stand-alone which cannot perform inertia frequency modulation at present and putting the stand-alone in a PitchDFIG queue;
2.3.1.3 The method comprises the steps of) counting the power reduction capability of all single machines in each queue, wherein the total power reduction capability of the single machines in an InerInDFIG queue in inertia frequency modulation is P1_ decr, and the total power reduction capability of the single machines in an InerOutDFIG queue which is not in inertia but has inertia capability is P2_ decr;
2.3.1.4 Respectively calculate the total power value of the single machine allocation of each queue
If the absolute value of the delta Pf is less than or equal to P1_ decr, which indicates that the requirement can be met only by performing power reduction operation on a single machine in the inertia frequency modulation, P _ iner _ decr =deltaPf, P _ inerout _ decr =0, P \\ u pitch \ decr =0, wherein the absolute value of the difference value delta Pf between the target power value and the actual power of the wind field is represented by the delta Pf, and the total power reduction target value of the IninerDFIG queue is represented by the P _ iner _ decr; p _ inolout _ decr represents the total power down target value of the inseutdfig queue; p _ pitch _ decr represents the total derate target value of the PitchDFIG queue;
if P1_ decr < | delta Pf | ≦ P1_ decr + P2_ decr, which indicates that power distribution needs to be performed on the InerInDFIG and InerOutDFIG units, P _ iner _ decr = P1_ decr, P _ inerout _ decr = | delta Pf | -P1_ decr, and P _ pitch _ decr =0;
if the target P1_ decr + P2_ decr < | Δ Pf |, which indicates that the stand-alone inertia capability is insufficient, and the remaining power is performed by the PitchDFIG fleet stand-alone pitch operation, P _ input _ decr = P1_ decr, P _ inout _ decr = P2_ decr, P _ pitch _ decr = | Δ Pf | -P1_ decr-P2_ decr;
2.3.1.5 Power allocation to individual machines in each queue
When P _ inerin _ decr >0, performing inertia distribution on the InerInDFIG queue stand-alone;
when P _ inolout _ decr >0, carrying out inertia distribution on a single machine in the IneruOutDFIG queue;
when P _ pitch _ decr >0, the allocation of cell power to the PitchDIG queue occurs.
3. The wind farm participant inertia frequency modulation control method according to claim 1, characterized by: in step 2.3), the step of allocating the power per liter comprises the following steps:
2.3.2.1 A single machine is divided into a controllable single machine and an uncontrollable single machine, and only the controllable single machine is operated;
2.3.2.2 For a controllable stand-alone machine, dividing the controllable stand-alone machine into a stand-alone machine in inertia frequency modulation, a stand-alone machine which is not in inertia but has inertia capability and a stand-alone machine which cannot perform inertia frequency modulation at present according to the state of the stand-alone machine, setting the stand-alone type of the stand-alone machine in inertia frequency modulation and putting the stand-alone machine into an InerInDFIG queue, setting the stand-alone type of the stand-alone machine which is not in inertia but has inertia capability and putting the stand-alone machine into an InerOutDFIG queue, and setting the stand-alone type of the stand-alone machine which cannot perform inertia frequency modulation at present and putting the stand-alone DFIG queue;
2.3.2.3 The total power-up capacity of the single machines in the InerInDFIG queue in inertia adjustment is P1_ incr, and the total power-up capacity of the single machines in the InerInDFIG queue which is not in inertia but has inertia capacity is P2_ incr;
2.3.2.4 Respectively calculate the total power value of the single machine allocation of each queue
If delta Pf is less than or equal to P1_ incr, which indicates that the requirement can be met only by performing power-up operation on a single machine in inertia adjustment, P _ iner _ incr =deltaPf, P _ inerout _ incr =0, P _pitch _ incr =0, wherein delta Pf represents the difference value between the target power value and the actual power of the wind field, and P _ iner _ incr represents the total power-up target value of the InernDFIG queue; p _ inerout _ incr represents the total boosted power target value of the InerOutDFIG queue; p _ pitch _ incr represents the total up-power target value of the PitchDFIG queue;
if P1_ incr <. DELTA Pf is less than or equal to P1_ incr + P2_ incr, which indicates that power distribution needs to be carried out on InerInDFIG and InerOutDFIG single units, P _ incr = P1_ incr, P _ inout _ incr = DELTA Pf-P1_ incr, and P _ pitch _ incr =0;
if P1_ incr + P2_ incr <. DELTA.Pf, indicating that the stand-alone inertia capability is insufficient and the remaining power is being performed by the PitchDFIG fleet stand-alone pitch operation, P _ incr = P1_ incr, P _ inorout _ incr = P2_ incr, P _ pitch _ incr =. DELTA.Pf-P1 _ incr-P2_ incr;
2.3.2.5 Power allocation to individual machines in each queue
When P _ iner _ incr >0, performing inertia distribution on the InerInDFIG queue stand-alone;
when P _ inolout _ incr >0, carrying out inertia distribution on a single machine in an IneruOutDFIG queue;
when P _ pitch _ incr >0, the allocation of single-ended power to the pitchDIG queue.
4. The wind farm participant inertia frequency modulation control method according to claim 2, characterized in that: in step 2.3.1.3), the calculation method of the total power reduction capability P1_ decr of the inderingig queue single machine is as follows:
the platform records initial power Pi0 of the single machine entering frequency modulation, sets the power of the single machine participating in inertia frequency modulation as w _ PiN _ Pin, wherein Pin is the rated power of the single machine, the lower limit value of the power of the single machine inertia frequency modulation is Pin _ low = Pi0-w _ PiN _ Pin, w _ PiN is a settable variable, compares Pin _ low with Pimin, pimin is the minimum value of power adjustment, defaults to 0.1Pin, the larger value between the two is taken as the lower limit value of inertia frequency modulation, and sets the final lower limit value of power adjustment Pin _ min, pin _ min = max (Pin _ low, pimin), so that the inertia residual capacity of the single machine is Pin _ decr, pin _ decr = Pimea-Pin _ min, and the inertia residual capacity of the single machine in all inertia frequency modulation is: p1_ decr = ∑ Pire _ decr;
the calculation method of the total power reduction capability P2_ decr of the InerInDFIG queue single machine is as follows:
the method comprises the steps of collecting an inertia Flag _ ctrl, the actual active power Pimea and the rotating speed Wimea of a single machine, and enabling the single machine to enter an inertia frequency modulation mode when the single machine simultaneously meets the four conditions of Flag _ ctrl = =1, pimea > < w \ min x Pin, wimea > < Wimin and Wimea < Wimax, wherein w _ min is 0.2, which means that only the single machine with the power higher than 20 Pin can enter inertia adjustment, wimin represents the lower limit value of the rotating speed, and Wimax represents the upper limit value of the rotating speed;
the lower inertia limit value is Piner _ low = Pimea-w _ PiN + Pin, piner _ low and Pimin are compared, the larger of the two is the final lower limit value Piner _ min, piner _ min = max (Piner _ low, pimin), the inertia frequency modulation capability of the single machine is Piner _ decr, piner _ decr = Pimea-Piner _ min, the inertia modulation capability of all single machines which are not in the inertia but have the inertia capability and is P2_ decr = ∑ Piner _ decr.
5. The wind farm participant inertia frequency modulation control method according to claim 2, characterized in that: in step 2.3.1.5), the inelndfig single-machine inertia allocation method is as follows:
the distribution principle is as follows: all InerInDFIG single machines participate in the process and are distributed according to the principle of similarity margin so as to reduce the variation of a single machine, and the distribution formula is as follows: dPiset _ decr = pin _ decr/P1_ decr × P _ inner _ decr, where dPiset _ decr represents the power required to be reduced by the stand-alone inertia, and the stand-alone target power is Piref = Pimea-dPiset _ decr;
the IneruOutDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: the method comprises the steps that a single machine is provided with a protection system, the single machine exits an inertia frequency modulation mode due to the fact that inertia adjustment amount is too large or current wind speed is insufficient, after the single machine exits the inertia mode, a period of time is needed for restoring the rotating speed, the single machine cannot adjust inertia in the restoring period until the restoring time is reached, the single machine cannot adjust inertia in a new round, in an IneruOutDFIG single machine queue which does not enter inertia adjustment and has inertia capacity, power reduction coefficients Cisub and Cisub = (Pimea-Pimin)/Pin of all the single machines are calculated firstly, then the single machines are sorted from large to small according to the Cisub, and the single machines are sequentially selected for inertia adjustment until the inertia requirement is met;
the PitchDFIG stand-alone power allocation method is as follows: and calling a primary frequency modulation function to distribute power for the single machine which cannot carry out inertia adjustment.
6. The wind farm participant inertia frequency modulation control method according to claim 3, characterized in that: in step 2.3.2.3), the calculation method of the total power-up capability P1_ incr of the individual units in the iner dfig queue is as follows:
the platform records the initial power Pi0 of the single machine entering frequency modulation, the power of the single machine participating in inertia adjustment is set to be w _ Pin & ltPin & gt, wherein Pin is the rated power of the single machine, the upper limit value of the power of the single machine inertia adjustment is Pin _ upper, pin _ upper = Pi0+ w _ Pin & ltPin & gt, w _ Pin is a settable variable, the Pin _ upper and Pin are compared, the smaller value between the Pin _ upper and the Pin is taken as the upper limit value of the inertia adjustment, the maximum value Pin _ max of the power adjustment is set, namely Pin _ max = min (Pin _ upper, pin), the residual inertia capacity of the single machine is Pin _ incr, pin _ incr = Pin _ max-Pimea, and the residual inertia capacity of the single machine in all inertia adjustments is: p1_ incr =Σpire _ incr;
the method for calculating the total power-up capacity P2_ incr of the IneruOutDFIG queue single machine is as follows:
the method comprises the steps that an inertia Flag _ ctrl, the actual active power Pimea and the rotating speed Wimea of a single machine are collected, when the single machine which simultaneously meets the four conditions of Flag _ ctrl =1, pimea = w \\ u \ min Pin, wimea >and Wimea < Wimax has inertia capability, the single machine can enter an inertia frequency modulation mode, wherein w _ min is 0.2, which means that only the single machine with the power higher than 20 PiN can enter inertia adjustment, wimin represents a lower limit value of the rotating speed, and Wimax represents an upper limit value of the rotating speed;
the upper inertia value is Piner _ up, piner _ up = Pimea + w _ PiN + Pin, and the smaller of Piner _ up and Pin is compared to the upper inertia adjustment value Piner _ max, i.e. Piner _ max = min (Piner _ up, pin), then the inertia adjustment capability of the stand-alone is Piner _ incr, piner _ incr = Piner _ max-Pimea, the inertia adjustment capability of all stand-alone machines which are not in inertia but have inertia capability and is P2_ incr = ∑ Piner _ incr.
7. The wind farm participant inertia frequency modulation control method according to claim 3, characterized in that: in step 2.3.2.5), the inerldfig stand-alone inertia distribution method is as follows:
the distribution principle is as follows: all InerInDFIG single machines participate in the process and are distributed according to the principle of similarity margin so as to reduce the variation of a single machine, and the distribution formula is as follows: dPiset _ incr = Piner _ incr/P1_ incr × P _ inner _ incr, where dPiset denotes the power required to be increased by the stand-alone inertia, and the stand-alone target power is Piref = Pimea + dPiset _ incr;
the IneruOutDFIG single-machine inertia distribution method comprises the following steps:
the distribution principle is as follows: the method comprises the steps that a stand-alone machine is provided with a protection system, the stand-alone machine exits an inertia frequency modulation mode due to the fact that inertia adjustment amount is too large or current wind speed is insufficient, after the stand-alone machine exits the inertia mode, a period of time is needed for recovering rotating speed, the stand-alone machine cannot perform inertia adjustment within the recovery period until the recovery time is reached, the stand-alone machine cannot perform a new round of inertia adjustment, for InerhutOutDFIG stand-alone machine queues which do not enter inertia adjustment and have inertia capacity, first, the rising power coefficient Ciadd = (Pimax-Pimea)/Pin of all stand-alone machines are calculated, wherein Pimax represents stand-alone machine predicted power, then sequencing from large to small is performed according to the Ciadd, and then stand-alone machines are sequentially selected to perform inertia adjustment until the inertia requirement is met;
the PitchDFIG stand-alone power allocation method is as follows: and for the single machine which cannot perform inertia adjustment, calling a primary frequency modulation function to distribute power.
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