CN110556863B - Inertia-free power supply access capacity estimation method constrained by frequency stability - Google Patents

Inertia-free power supply access capacity estimation method constrained by frequency stability Download PDF

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CN110556863B
CN110556863B CN201910821867.6A CN201910821867A CN110556863B CN 110556863 B CN110556863 B CN 110556863B CN 201910821867 A CN201910821867 A CN 201910821867A CN 110556863 B CN110556863 B CN 110556863B
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power
inertia
fault
frequency
power supply
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CN110556863A (en
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吴雪莲
程亮
李兆伟
汪惟源
黄慧
朱玲
赵学茂
窦飞
丁钊
谭真
程锦闽
蔡晖
张倩
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State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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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
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The invention discloses a method for estimating inertia-free power supply access capacity constrained by system transient frequency stability, which comprises the following steps: determining a boundary of a system parameter and a frequency stability related to the frequency characteristic; determining the category of the high-power disturbance fault; aiming at different fault disturbance types, estimating the minimum starting number of conventional units and the maximum output of the inertia-free power supply under various disturbance faults; the access capability of the system to the inertialess power supply is evaluated subject to frequency stability constraints. The invention can evaluate the frequency stability of the system, guide the arrangement of the operation mode of the power grid and the dispatching of the power grid, and can also guide the planning of the power grid.

Description

Inertia-free power supply access capacity estimation method constrained by frequency stability
Technical Field
The invention relates to an inertia-free power supply access capacity estimation method constrained by frequency stability, and belongs to the technical field of power systems and automation thereof.
Background
With the continuous increase of extra-high voltage direct current capacity and distributed new energy grid-connected capacity, the traditional synchronous generator is continuously replaced, on one hand, the risk that the system is subjected to high-capacity power shortage faults is increased, and meanwhile, as the inertia and the primary frequency modulation capacity of the system are continuously reduced, the frequency instability risk of multiple direct currents fed into a power grid is gradually increased.
The rotational inertia of the conventional unit reflects the buffer capacity of the unit to frequency change, and ensures that the generator has enough time to realize the adjustment of active power when the load disturbance amount is large, and the adjustment has no relation with the actual output of the unit and the amount of the rotary equipment. The wind power, photovoltaic and other new energy sources are different from conventional units, the equivalent moment of inertia is very small, a related frequency adjusting function is lacked, meanwhile, the actual output is closely related to the system voltage level, and under the condition that the system voltage fluctuates greatly, the actual output changes, so that the frequency safety of the system is threatened. At present, although a learner proposes virtual inertia control of a new energy source participating in primary frequency modulation, the control mode needs to reserve enough spare capacity in a normal operation mode to play a role, and the control mode also belongs to primary frequency modulation essentially, and is different from the role of rotational inertia of a synchronous machine on system frequency stabilization.
Under the background of high-capacity access of direct current and new energy without inertia or weak inertia of a system, how to estimate the access capacity of an inertia-free power supply constrained by the transient frequency stability of the system has important significance on the arrangement of a power grid operation mode and the power grid dispatching.
Disclosure of Invention
The invention provides a method for estimating the access capability of a non-inertia power supply constrained by the transient frequency stability of a system, aiming at the background of high-capacity access of direct current and new energy without inertia or weak inertia of the system, considering the effect of the synchronous inertia of the system on the frequency stability and how to estimate the access capability of the non-inertia power supply constrained by the transient frequency stability of the system.
The technical scheme adopted by the invention is as follows:
the invention discloses a method for estimating inertia-free power supply access capacity constrained by system transient frequency stability, which comprises the following steps of:
determining the type of the high-power disturbance fault of the system based on pre-collected system parameters related to frequency characteristics;
aiming at different fault disturbance types, estimating the minimum starting number of conventional units and the maximum output of the inertia-free power supply under various disturbance faults;
the system was evaluated for access capability to inertialess power supplies subject to frequency stability constraints.
Further, the system parameters comprise the total load capacity of the system, the average kinetic energy of the conventional generator set, the average minimum output, the rated frequency of the system and the stable boundary of the frequency;
the frequency-stable boundary includes: maximum rate of change of frequency and maximum frequency deviation that the system can tolerate.
Further, the method for determining the category of the system high-power disturbance fault is as follows:
dividing the power shortage fault into power shortage faults for the fault disturbance, wherein the power shortage faults are permanent or the duration time of the power shortage faults exceeds a threshold value;
dividing a fault which causes the instantaneous power shortage of the system and can be recovered within a preset time into power impact faults;
and dividing the instantaneous power disturbance of which the power disturbance quantity indirectly caused by the indirect power shortage fault is related to the inertia-free power supply output into uncertain power disturbance faults.
Still further, a method for estimating the minimum startup number of conventional units and the maximum power of the inertia-free power supply required by the system under different fault disturbance types includes the following steps:
for the power shortage fault, calculating a frequency stability boundary corresponding to the power shortage fault according to the maximum frequency change rate which can be borne by a system, the maximum frequency deviation of the system and the response delay of emergency control under the power shortage fault;
determining the corresponding system minimum inertia according to the frequency-stable boundary corresponding to the power shortage fault, and finally determining the maximum accessible inertia-free power supply of the system corresponding to the power shortage fault according to the total load capacity of the system, the average minimum output of the system and the corresponding system minimum inertia;
for the power impact fault, calculating a frequency stability boundary corresponding to the power impact fault according to the maximum frequency change rate bearable by a system, the maximum frequency deviation of the system and the total duration of continuous power impact faults;
determining the corresponding system minimum inertia according to the frequency stabilization boundary corresponding to the power impact fault, and finally determining the maximum accessible inertia-free power supply of the system corresponding to the power impact fault according to the total system load, the average minimum system output and the corresponding system minimum inertia;
for the uncertain power disturbance fault, determining a frequency stability boundary corresponding to the uncertain power disturbance fault according to the maximum frequency change rate bearable by the system, the maximum frequency deviation of the system and the duration of the uncertain power disturbance fault;
and determining the corresponding system minimum inertia according to the frequency stabilization boundary corresponding to the uncertain power disturbance fault, and finally determining the maximum accessible inertia-free system corresponding to the uncertain power disturbance fault according to the total load capacity of the system, the average minimum output of the system, the perturbation value of the power supply inertia-free power supply output and the corresponding system minimum inertia.
The invention has the following beneficial effects:
the method of the invention provides a method for estimating the access capability of the inertia-free power supply constrained by the transient frequency stability of the system aiming at the background of the high-capacity access of the direct current and new energy without inertia or weak inertia of the system, which is helpful for mastering the current frequency stability level of the system and guiding the arrangement of the operation mode of the power grid and the dispatching of the power grid;
the invention takes the maximum frequency change rate and the maximum frequency deviation which can be borne by the system as the frequency stability boundary, simultaneously takes the emergency control function into consideration, respectively calculates the minimum inertia of the system which is limited by the frequency stability under different fault disturbance modes according to the characteristics of different types of faults, and finally provides the maximum inertia-free power supply access proportion which can keep the frequency stability of the system.
Drawings
FIG. 1 is a work flow diagram of the method of the present invention.
FIG. 2 is a typical power curve of a first type of fault disturbance form in accordance with an embodiment of the present invention;
FIG. 3 is a typical power curve for a second type of fault disturbance mode in accordance with an embodiment of the present invention;
fig. 4 is a typical power curve for a third type of fault-disturbance mode in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The basic principle of the method is as follows: the maximum frequency change rate and the maximum frequency deviation which can be borne by the system are used as frequency stability boundaries, the emergency control function is considered, the minimum inertia of the system which is limited by frequency stability under different fault disturbance modes is solved according to the characteristics of different types of faults, and finally the maximum inertia-free power supply access proportion of the system which can keep the frequency stability is given. The specific implementation steps are shown in fig. 1.
(1) Firstly, obtaining system parameters related to frequency characteristics, wherein the total load capacity of the system is L, and the average kinetic energy E of a conventional generator setMWS.avrAverage minimum force of PminRated frequency of the system is f0. The boundaries of frequency stabilization include: maximum rate of change of frequency (df/dt) that the system can toleratemaxAnd maximum frequency deviation Δ fmax。
(2) Determining the category of the high-power disturbance fault:
2-1) for fault disturbances the presence of permanent or up to several minutes of power deficit in the system is recorded as a power deficit fault and the amount of power deficit as Δ P1A typical fault is a dc blocking fault, as shown in fig. 2;
2-2) for the fault which causes the system instantaneous power shortage and can be recovered in short time, the fault is marked as a power surge fault, the fault comprises a plurality of continuous instantaneous power surges, and the instantaneous power shortage amount is marked as delta P2And the duration of each impact fault is recorded as t2i(i is 1,2 … n, respectively, where n is the total number of consecutive instantaneous power deficit), typical faults are either direct current commutation failures or consecutive commutation failures, as shown in FIG. 3;
2-3) recording instantaneous power disturbance related to power disturbance quantity and inertia-free power output caused indirectly by indirect power shortage fault as uncertain power disturbance fault, recording the ratio of the power disturbance quantity to the total inertia-free power output of the system as lambda, and recording the duration of the fault as t3The typical fault is an ac ground fault resulting in new energy entering low penetration resulting in reduced output as shown in fig. 4.
(3) Aiming at different fault disturbance types, estimating the minimum starting number of conventional units and the maximum output of the inertia-free power supply under various disturbance faults:
3-1) for the first fault type, the action of emergency control needs to be taken into account, and the response delay of the emergency control is t1The boundary of the frequency stability under the fault form is
df1＝min[(df/dt)max,dΔfmax/t1]
The corresponding system minimum inertia is
Figure GDA0002694900450000051
Figure GDA0002694900450000052
At the moment, the number of the starting units of the conventional unit is not less than n1Minimum integer of N1。
The maximum accessible inertia-free power supply of the system has the calculation expression of
Pnew1＝L-N1Pmin
3-2) for the second type of fault, first calculate the total duration of the consecutive faults
Figure GDA0002694900450000053
Then determining the boundary of the frequency stability as
df2＝min[(df/dt)max,dΔfmax/t2]
The corresponding system minimum inertia is
Figure GDA0002694900450000061
Figure GDA0002694900450000062
At the moment, the number of the starting units of the conventional unit is not less than n2Minimum integer of N2。
The maximum accessible inertia-free power supply of the system has the calculation expression of
Pnew2＝L-N2Pmin
3-3) in the third type of failure mode, the boundary for determining the frequency stability is
df3＝min[(df/dt)max,dΔfmax/t3]
3-3-1) setting the initial value of the output force of the inertia-free power supply to be Pnew3-i(i＝0)。
3-3-2) has output P to inertia-free power supplynew3-iThe minimum kinetic energy required by the system is calculated.
Figure GDA0002694900450000063
Figure GDA0002694900450000064
The number of starting units of the conventional unit is not less than n3-iMinimum integer of N3-i。
The output of each conventional generator set in the system is
Figure GDA0002694900450000065
3-3-3) if PG-i＞nPimIf i is equal to i +1, Pnew3-i+1＝Pnew3-i+ Δ P, return to step 3-3-2);
up to PG-i≤PminThe maximum output of the inertia-free power supply is Pnew3＝Pnew3-i- Δ P, corresponding to the minimum number of starting units N of a conventional unit3＝N3-(i-1)(Δ P is the perturbation value of the output of the inertia-free power supply).
(4) The system was evaluated for access capability to inertialess power supplies subject to frequency stability constraints.
Under various fault disturbance modes, the proportion of the maximum accessible inertia-free power supply of the system to the total load is
Figure GDA0002694900450000071
In the formula, i is 1,2 and 3 respectively.
The maximum access capability of the inertia-free power supply, constrained by the transient frequency stability of the system, is η ═ min (η)1,η2,η3)，Pnew1Maximum accessible inertia-free power supply, P, for a system corresponding to a power shortage faultnew2Maximum accessible inertia-free power supply, P, of the system for power surge faultsnew3And the maximum output of the inertia-free power supply corresponding to the uncertain power disturbance fault.
The method is used for evaluating the frequency stability of the system and guiding the arrangement of the operation mode of the power grid and the dispatching of the power grid. Based on the current starting mode of the conventional unit of the power grid, the method provided by the invention can be used for estimating the maximum capacity of the inertia-free power supply which can be accessed in the system, and further obtaining the maximum capacity of the inertia-free new energy which is allowed to be connected to the grid at present; or based on the predicted value of the future output of new energy, the method for estimating the access capacity of the inertia-free power supply can be used for reversely deducing the critical inertia minimum value required by the power grid at the moment, so that power grid dispatching personnel are guided to arrange the minimum starting mode of the conventional unit in the system.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The inertia-free power supply access capacity estimation method constrained by frequency stability is characterized by comprising the following steps of:
determining the type of the high-power disturbance fault of the system based on pre-collected system parameters related to frequency characteristics; aiming at different fault disturbance types, estimating the minimum starting number of conventional units and the maximum output of the inertia-free power supply under various disturbance faults;
estimating the access capability of the system to the inertia-free power supply subject to the frequency stability constraint;
the method for determining the category of the high-power disturbance fault of the system comprises the following steps:
dividing the power shortage fault into power shortage faults for the fault disturbance, wherein the power shortage faults are permanent or the duration time of the power shortage faults exceeds a threshold value;
dividing a fault which causes the instantaneous power shortage of the system and can be recovered within a preset time into power impact faults;
and dividing the instantaneous power disturbance of which the power disturbance quantity indirectly caused by the indirect power shortage fault is related to the inertia-free power supply output into uncertain power disturbance faults.
2. The method of estimating inertia-free power access capability subject to frequency stability constraints of claim 1 wherein the system parameters include total system load, average kinetic energy of conventional generator sets, average minimum output, system rated frequency, and boundaries of frequency stability; the frequency-stable boundary includes: maximum rate of change of frequency and maximum frequency deviation that the system can tolerate.
3. The method for estimating the inertialess power supply access capacity constrained by the frequency stability as claimed in claim 1, wherein the method for estimating the minimum startup number of conventional units and the maximum output of the inertialess power supply required by the system under different fault disturbance types comprises the following specific steps:
for the power shortage fault, calculating a frequency stability boundary corresponding to the power shortage fault according to the maximum frequency change rate which can be borne by a system, the maximum frequency deviation of the system and the response delay of emergency control under the power shortage fault; determining the corresponding system minimum inertia according to the frequency-stable boundary corresponding to the power shortage fault, and finally determining the maximum accessible inertia-free power supply of the system corresponding to the power shortage fault according to the total load capacity of the system, the average minimum output of the system and the corresponding system minimum inertia;
for the power impact fault, calculating a frequency stability boundary corresponding to the power impact fault according to the maximum frequency change rate bearable by a system, the maximum frequency deviation of the system and the total duration of continuous power impact faults; determining the corresponding system minimum inertia according to the frequency stabilization boundary corresponding to the power impact fault, and finally determining the maximum accessible inertia-free power supply of the system corresponding to the power impact fault according to the total system load, the average minimum system output and the corresponding system minimum inertia;
for the uncertain power disturbance fault, determining a frequency stability boundary corresponding to the uncertain power disturbance fault according to the maximum frequency change rate bearable by the system, the maximum frequency deviation of the system and the duration of the uncertain power disturbance fault; and determining the corresponding system minimum inertia according to the frequency stabilization boundary corresponding to the uncertain power disturbance fault, and finally determining the maximum accessible inertia-free system corresponding to the uncertain power disturbance fault according to the total load capacity of the system, the average minimum output of the system, the perturbation value of the power supply inertia-free power supply output and the corresponding system minimum inertia.
4. The inertia-free power access capability estimation method subject to frequency stability constraints of claim 3,
for a power deficit fault, the computational expression for the corresponding frequency stable boundary is as follows:
df1＝min[(df/dt)max,dΔfmax/t1]
wherein df is1For power shortage fault corresponding to frequency stability boundary, (df/dt)maxMaximum rate of change of frequency, Δ f, acceptable to the systemmaxIs the maximum frequency deviation of the system, t1Response delay for emergency control under power shortage fault;
the corresponding system minimum inertia is
Figure FDA0002694900440000031
Figure FDA0002694900440000032
Wherein EMWS1The minimum inertia of the system corresponding to the power shortage fault; eMWS.avrAverage kinetic energy of conventional generator sets, f0For rated frequency of the system, Δ P1Corresponding to the power deficit amount for the power deficit fault; n is1Minimum inertia E of system corresponding to power shortage faultMWS1Average kinetic energy E of conventional generator setMWS.avrThe ratio of (A) to (B);
at the moment, the number of the starting units of the conventional unit is not less than n1Minimum integer of N1；
The calculation expression of the maximally-accessible inertia-free power supply of the system corresponding to the power shortage fault is
Pnew1＝L-N1Pmin
Wherein P isnew1The maximum accessible inertia-free power supply of the system corresponding to the power shortage fault, L is the total load capacity of the system, and P isminThe system average minimum force.
5. The method of estimating inertialess power-on capability constrained by frequency stability as claimed in claim 3, wherein for power-surge faults, the total duration t of successive power-surge faults is calculated2The expression is as follows:
Figure FDA0002694900440000033
wherein the duration of each impact failure is recorded as t2iI is 1,2 … m, respectively, where m is the total number of consecutive occurrences of the instantaneous power deficit;
the boundary expression for determining the frequency stability corresponding to the power surge fault is as follows:
df2＝min[(df/dt)max,dΔfmax/t2]，
wherein df is2For power surge faults, corresponding to the boundary of frequency stability, (df/dt)maxMaximum rate of change of frequency, Δ f, acceptable to the systemmaxIs the maximum frequency deviation of the system, t2Total duration of continuous power surge faults;
the minimum inertia of the system corresponding to the power surge fault is
Figure FDA0002694900440000041
Figure FDA0002694900440000042
EMWS2The minimum inertia of the system corresponding to the power impact fault; eMWS.avrAverage kinetic energy of conventional generator sets, f0For rated frequency of the system, Δ P2Corresponding to the instantaneous power deficit amount for the power impact fault; n is2Minimum system inertia E for power surge faultMWS2Average kinetic energy E of conventional generator setMWS.avrThe ratio of (A) to (B);
at the moment, the number of the starting units of the conventional unit is not less than n2Minimum integer of N2；
The calculation expression of the maximum accessible inertia-free power supply corresponding to the power impact fault system is as follows:
Pnew2＝L-N2Pmin
Pnew2the maximum accessible inertia-free power supply of the system corresponding to the power impact fault, L is the total load capacity of the system, and P isminIs the average minimum force.
6. The inertia-free power access capability estimation method constrained by frequency stability according to claim 3, wherein for the uncertain power disturbance fault, the boundary for determining the frequency stability corresponding to the uncertain power disturbance fault is:
df3＝min[(df/dt)max,dΔfmax/t3]
wherein df is3Corresponding to the frequency stability boundary (df/dt) for uncertain power disturbance faultsmaxMaximum rate of change of frequency, Δ f, acceptable to the systemmaxIs the maximum frequency deviation of the system, t3The duration of the fault is disturbed for uncertain power;
3-1) setting the initial value of the output force of the inertia-free power supply to be Pnew3-iI is zero;
3-2) the output of the inertia-free power supply is Pnew3-iCalculating the minimum kinetic energy required by the system, wherein the expression is as follows;
Figure FDA0002694900440000043
Figure FDA0002694900440000051
EMWS3-ithe minimum inertia of the system corresponding to the uncertain power disturbance fault is obtained; eMWS.avrAverage kinetic energy of conventional generator sets, f0Is the rated frequency of the system; n is3-iMinimum system inertia E corresponding to uncertain power disturbance faultMWS3-iAverage kinetic energy E of conventional generator setMWS.avrThe lambda is the proportion of the uncertain power disturbance quantity to the output force of the inertia-free power supply, and L is the total active load quantity of the system;
the number of starting units of the conventional unit is not less than n3-iMinimum integer of N3-i；
The output of each conventional generator set in the system is
Figure FDA0002694900440000052
3-3) if PG-i＞Pmin，PminTo average the minimum output, let i equal i plus 1, Pnew3-(i+1)＝Pnew3-i+ Δ P, return to step 3-2); up to PG-i≤PminIf the maximum output of the inertia-free power supply corresponding to the uncertain power disturbance fault is Pnew3＝Pnew3-i- Δ P, corresponding to the minimum number of starting units N of a conventional unit3＝N3-(i-1)And delta P is a perturbation value of the output force of the inertia-free power supply.
7. The method for estimating the access capability of the inertia-free power supply constrained by the frequency stability as claimed in claim 1, wherein the access capability of the inertia-free power supply constrained by the frequency stability of the system is estimated by the following steps:
under various fault disturbance forms, the proportion of the maximum accessible inertia-free power supply of the system to the total load is as follows:
Figure FDA0002694900440000053
wherein i is 1,2,3, Pnew1Maximum accessible inertia-free power supply, P, for a system corresponding to a power shortage faultnew2Maximum accessible inertia-free power supply, P, of the system for power surge faultsnew3The maximum output of the inertia-free power supply corresponding to the uncertain power disturbance fault is obtained, and L is the total active load of the system;
the maximum access capability of the inertia-free power supply, constrained by the transient frequency stability of the system, is η ═ min (η)1,η2,η3)。
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