CN108964068A - A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy - Google Patents

A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy Download PDF

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CN108964068A
CN108964068A CN201810766707.1A CN201810766707A CN108964068A CN 108964068 A CN108964068 A CN 108964068A CN 201810766707 A CN201810766707 A CN 201810766707A CN 108964068 A CN108964068 A CN 108964068A
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frequency
shed
load
amount
low
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许占科
任建文
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North China Electric Power University
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North China Electric Power University
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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The invention discloses a kind of low-frequency load shedding scheme setting methods for adapting to different capacity vacancy.The adjusting of low-frequency load shedding scheme includes 3 operating frequency, off-load amount and delay major parameters.Basic principle based on low-frequency load shedding determines suitable cutting load frequency definite value by the analysis of system scale and frequency control accuracy requirement on the basis of Traditional Method；By the research of minimum tangential load amount and each round cutting load ratio, the cutting load amount parameter of each wheel is determined；Delay is according to engineering experience appropriate adjustment.This method can optimize existing low-frequency load shedding scheme, improve the adaptability of scheme, meet the cutting load requirement under different capacity disturbance, and guaranteeing that frequency is fallen will not be too low and can restore rapidly.

Description

A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy
Technical field
The present invention relates to a kind of low-frequency load shedding scheme setting methods for adapting to different capacity vacancy, belong to the stable control of system In three lines of defence emergent control measure.
Background technique
When island-grid is by serious disturbance, as the important link of three lines of defence in the stable control of system, low frequency Off-load is to prevent large-scale blackout generation, the emergent control measure of safeguards system frequency stability.Low-frequency load shedding is exactly to work as electric power System is in actual moving process, after causing active vacancy due to disturbance, cuts off a part of load rapidly to make frequency retrieval To rated value, a kind of safety control measures of collapse of frequency are prevented.
As rack is constantly reinforced, Anhui Power Grid has part 220kV electromagnetic looped network to unlink, and 220kV regional power grid is by 500kV Substation's power supply.When outlet single-phase fault, main protection tripping, all outlets of this substation of tripping after 1s occur for 500kV substation Catastrophe failure, 220kV regional power grid that 500kV substation has under its command forms isolated network, and Isolated Network System inertia is smaller, due to wattful power Rate vacancy easily leads to the low frequency problem of 220kV power grid, and serious situation can trigger low-frequency load shedding movement.Therefore, low-frequency load shedding side The adjusting of case is related to the safe and stable operation of system.
For the low frequency characteristic for the island-grid that catastrophe failure causes, the adaptability of original low-frequency load shedding scheme is studied；Base It in the basic principle of low-frequency load shedding, is optimized from off-load round, off-load amount and delay etc., proposes to adapt to different capacity The low-frequency load shedding scheme setting method of vacancy guarantees power grid to meet off-load requirement of the system under different running method Safe and stable operation.
Summary of the invention
It is an object of the invention to propose a kind of low-frequency load shedding scheme setting method for adapting to different capacity vacancy, this method Existing low-frequency load shedding scheme can be optimized, improve the adaptability of scheme, meet the cutting load requirement under different capacity disturbance, guarantee Frequency is fallen and will not be too low and can be restored rapidly.
The present invention uses following technical scheme in order to solve the above problem:
A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy, need to follow following basic principle:
1) guarantee that being effectively prevented from system frequency under different running method and Overload drops under dangerous point, Occurrence frequency does not collapse；It is 48Hz in view of can use final stage operating frequency after certain safety margin.
2) system frequency should be able to be made to restore as early as possible to 49.5Hz~50Hz, do not make frequency toning, also hang frequency for a long time It is floating；Not toning means that each stage load resection of low frequency load shedding equipment cannot be too big, and then requirement must have enough spies for no hovering Different wheel capacity.
3) when power shortage is smaller in system, less bear should be cut as far as possible under the premise of guaranteeing frequency retrieval effect Lotus；The economy run from customer power supply reliability and system considers, it is desirable that low-frequency load shedding scheme has reasonably in systems The capacity method of salary distribution.
4) occurrence frequency does not collapse each island network after should ensure that off-the-line yet；It is required that low-frequency load shedding scheme can both expire Requirement of the sufficient the whole network to frequency, and adapt to the frequency characteristic of area power grid.
A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy, in the specific implementation process system frequency f Meet the following conditions:
1) transient state low-limit frequency fmin> 47.5Hz avoids triggering unit underfrequency protection and interconnection low frequency off-the-line.
2) transient state highest frequency fmax< 51.5Hz guarantees mutually to coordinate with the protection of unit overfrequency.
3) steady frequency 49.5Hz≤f∞≤50.5Hz。
A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy, comprising the following steps:
1) definition automatic low frequency load shed- ding device is failure to actuate lower transient state low-limit frequency higher than 49Hz and steady frequency is 49.5Hz When power shortage value be system reference vacancy power, be denoted as Pre.Therefore, power shortage amount P after disturbingd≤Pre When, system can make in frequency retrieval to allowed band by spare capacity and itself fm capacity；Work as Pd> PreWhen, then Low frequency load shedding equipment need to be started.
2) frequency threshold and delay are determined according to the practical operation situation of power grid.Wherein power shortage amount and each round Off-load amount is the percentage on the basis of total load amount in system, and frequency threshold and Index For Steady-state retain certain nargin. Wherein: Pshed.iIndicate the off-load amount of the i-th wheel；PdPower shortage amount in expression system；fiIndicate the frequency threshold of the i-th round； fminFor frequency minimum in transient process；f∞For steady frequency.
3) adjustment start-up mode changes when applying the bet power become, at the same by Ma'an Mountain's subregion and Anhui major network disconnect to Simulated power miss fault, and calculate power shortage amount P at this timed, preferentially cut off Pshed=Pd-PreLoad, judge it is temporary at this time State frequency minimum fminWhether f is equal to2(retaining 0.05Hz nargin) is to turn in next step, it is straight otherwise to continue growing power shortage To fminEqual to f2。
4) off-load amount Δ P (cutting load amount increase is positive, and reduction is negative) is finely tuned, steady frequency f is made∞Restore to 49.50Hz Within the scope of~50.50Hz (reservation ± 0.5Hz nargin), to obtain the cutting load amount P of the 1st wheelshed.1=Pshed+ΔP。
5) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-Pre Load, judgement transient frequency minimum f at this timeminWhether f is equal to3(retaining 0.05Hz nargin) is to turn in next step, no Power shortage is then continued growing until fminEqual to f3。
6) off-load amount is finely tuned, steady frequency f is made∞(reservation ± 0.5Hz is abundant within the scope of recovery to 49.50Hz~50.50Hz Degree), obtain the 2nd round cut load Pshed.2=Pshed+ΔP-Pshed.1。
7) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-Pre Load, judgement transient frequency minimum f at this timeminWhether f is equal to4(retaining 0.05Hz nargin) is to turn in next step, no Power shortage is then continued growing until fminEqual to f4。
8) off-load amount is finely tuned, steady frequency f is made∞(reservation ± 0.5Hz is abundant within the scope of recovery to 49.50Hz~50.50Hz Degree), obtain the 3rd round cut load Pshed.3=Pshed+ΔP-Pshed.1-Pshed.2。
9) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-Pre Load, judgement transient frequency minimum f at this timeminWhether f is equal to5(retaining 0.05Hz nargin) is to turn in next step, no Power shortage is then continued growing until fminEqual to f5。
10) off-load amount is finely tuned, steady frequency f is made∞(reservation ± 0.5Hz is abundant within the scope of recovery to 49.50Hz~50.50Hz Degree), obtain the 4th round cut load Pshed.4=Pshed+ΔP-Pshed.1-Pshed.2-Pshed.3。
11) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-Pre Load, judgement transient frequency minimum f at this timeminWhether it is equal to 47.5Hz (retaining 0.05Hz nargin), is to turn next Step, otherwise continues growing power shortage until fminEqual to 47.5Hz.
12) off-load amount is finely tuned, steady frequency f is made∞(reservation ± 0.5Hz is abundant within the scope of recovery to 49.50Hz~50.50Hz Degree), obtain the 5th round cut load Pshed.5=Pshed+ΔP-Pshed.1-Pshed.2-Pshed.3-Pshed.4。
13) the cutting load amount of each round, end loop are exported.
Detailed description of the invention
Fig. 1 is low-frequency load shedding scheme tuning process；
Fig. 2 is island-grid simplified model；
Fig. 3 is the low-frequency load shedding prioritization scheme and original scheme action effect comparison diagram formulated after applying the present invention；Wherein, System frequency response curve when Fig. 3 (a) is is 13.6% by electric ratio；System frequency when Fig. 3 (b) is is 23.4% by electric ratio Response curve；System frequency response curve when Fig. 3 (c) is is 33.4% by electric ratio；It is 35.5% that Fig. 3 (d), which is by electric ratio, When system frequency response curve.
Specific embodiment
Above-mentioned part is expounded the technology of the present invention core and main realization step, in order to more clearly from Technological means of the invention is solved, the present invention is described in further detail now in conjunction with the drawings and specific embodiments.
The invention proposes a kind of low-frequency load shedding scheme setting methods for adapting to different capacity vacancy, need to follow following basic Principle:
1) guarantee that being effectively prevented from system frequency under different running method and Overload drops under dangerous point, Occurrence frequency does not collapse；It is 48Hz in view of can use final stage operating frequency after certain safety margin.
2) system frequency should be able to be made to restore as early as possible to 49.5Hz~50Hz, do not make frequency toning, also hang frequency for a long time It is floating；Not toning means that each stage load resection of low frequency load shedding equipment cannot be too big, and then requirement must have enough spies for no hovering Different wheel capacity.
3) when power shortage is smaller in system, less bear should be cut as far as possible under the premise of guaranteeing frequency retrieval effect Lotus；The economy run from customer power supply reliability and system considers, it is desirable that low-frequency load shedding scheme has reasonably in systems The capacity method of salary distribution.
4) occurrence frequency does not collapse each island network after should ensure that off-the-line yet；It is required that low-frequency load shedding scheme can both expire Requirement of the sufficient the whole network to frequency, and adapt to the frequency characteristic of area power grid.
Low-frequency load shedding scheme setting method, system frequency f meets the following conditions in the specific implementation process:
1) transient state low-limit frequency fmin> 47.5Hz avoids triggering unit underfrequency protection and interconnection low frequency off-the-line.
2) transient state highest frequency fmax< 51.5Hz guarantees mutually to coordinate with the protection of unit overfrequency.
3) steady frequency 49.5Hz≤f∞≤50.5Hz。
The present invention proposes a kind of low-frequency load shedding scheme setting method for adapting to different capacity vacancy, as shown in Figure 1, step is such as Under:
Step 1, definition automatic low frequency load shed- ding device is failure to actuate lower transient state low-limit frequency higher than 49Hz and steady frequency is Power shortage value when 49.5Hz is system reference vacancy power, is denoted as Pre.Therefore, power shortage amount P after disturbingd ≤PreWhen, system can make in frequency retrieval to allowed band by spare capacity and itself fm capacity；Work as Pd> Pre When, then need starting low frequency load shedding equipment.
Step 2, frequency threshold and delay are determined according to the practical operation situation of power grid.Wherein power shortage amount and each Round off-load amount is the percentage on the basis of total load amount in system, and frequency threshold and Index For Steady-state retain certain abundant Degree.Wherein: Pshed.iIndicate the off-load amount of the i-th wheel；PdPower shortage amount in expression system；fiIndicate the frequency threshold of the i-th round Value；fminFor frequency minimum in transient process；f∞For steady frequency.
Step 3, adjustment start-up mode changes when the bet power for applying change, while Ma'an Mountain's subregion and Anhui major network being disconnected To simulated power miss fault, and calculate power shortage amount P at this timed, preferentially cut off Pshed=Pd-PreLoad, judge this When transient frequency minimum fminWhether f is equal to2(retaining 0.05Hz nargin) is to turn in next step, otherwise to continue growing power and lack Volume is until fminEqual to f2。
Step 4, off-load amount Δ P (cutting load amount increase is positive, and reduction is negative) is finely tuned, steady frequency f is made∞Restore extremely Within the scope of 49.50Hz~50.50Hz (reservation ± 0.5Hz nargin), to obtain the cutting load amount P of the 1st wheelshed.1=Pshed+Δ P。
Step 5, bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed= Pd-PreLoad, judgement transient frequency minimum f at this timeminWhether f is equal to3(retaining 0.05Hz nargin), is to turn next Step, otherwise continues growing power shortage until fminEqual to f3。
Step 6, off-load amount is finely tuned, steady frequency f is made∞Restore to (reservation ± 0.5Hz within the scope of 49.50Hz~50.50Hz Nargin), obtain the 2nd round cut load Pshed.2=Pshed+ΔP-Pshed.1。
Step 7, bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed= Pd-PreLoad, judgement transient frequency minimum f at this timeminWhether f is equal to4(retaining 0.05Hz nargin), is to turn next Step, otherwise continues growing power shortage until fminEqual to f4。
Step 8, off-load amount is finely tuned, steady frequency f is made∞Restore to (reservation ± 0.5Hz within the scope of 49.50Hz~50.50Hz Nargin), obtain the 3rd round cut load Pshed.3=Pshed+ΔP-Pshed.1-Pshed.2。
Step 9, bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed= Pd-PreLoad, judgement transient frequency minimum f at this timeminWhether f is equal to5(retaining 0.05Hz nargin), is to turn next Step, otherwise continues growing power shortage until fminEqual to f5。
Step 10, off-load amount is finely tuned, steady frequency f is made∞Restore to 49.50Hz~50.50Hz (retain ± 0.5Hz nargin), obtain the 4th round cut load Pshed.4=Pshed+ΔP-Pshed.1-Pshed.2-Pshed.3。
Step 11, bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed= Pd-PreLoad, judgement transient frequency minimum f at this timeminWhether it is equal to 47.5Hz (retaining 0.05Hz nargin), is to turn In next step, power shortage is otherwise continued growing until fminEqual to 47.5Hz.
Step 12, off-load amount is finely tuned, steady frequency f is made∞Restore to 49.50Hz~50.50Hz (retain ± 0.5Hz nargin), obtain the 5th round cut load Pshed.5=Pshed+ΔP-Pshed.1-Pshed.2-Pshed.3-Pshed.4。
Step 13, the cutting load amount of each round, end loop are exported.
Steps are as follows with validation verification for the adaptation of methods proposed:
(1) simulation model shown in Fig. 2 is established in software BPA, wherein Maanshan district power grid is become by two 500kV Depressor is connected with Anhui major network, when 500kV this change of tripping after painting substation generation outlet single-phase fault, main protection tripping, 1s The catastrophe failure of all outlets in power station, this area will form isolated island.There are one factory of horse, 2 660MW units, horse two in Ma'an Mountain's power grid 3 300MW units of factory, while being also dispersed with small unit, all units such as horse heat, pool trouble and completely sending out；Area power grid total load 2889MW is made of 40% constant impedance and 60% firm power load.
(2) major network original low-frequency load shedding scheme in Anhui includes 6 grades of basic wheels, wherein first run frequency initiation value 49Hz, frequency difference For 0.25Hz, delay is 0.5s, last wheel frequency initiation value 47.5Hz；2 grades of special wheels, frequency initiation value point are set simultaneously Not Wei 49Hz and 48.5Hz, be delayed as 20s.Substantially the off-load amount taken turns is the 28.6% of system total load, and special wheel is that system is total The 7.5% of load, i.e., total off-load amount are 36.1% (as shown in table 1) of Anhui Power Grid total load.Synchronous lower all areas of networking Power grid uses unified low-frequency load shedding scheme.
1 Anhui Power Grid low-frequency load shedding scheme of table
(3) based on the basic principle of low-frequency load shedding, the low-frequency load shedding scheme according to the adaptation different capacity vacancy of proposition is whole Determine method, formulates prioritization scheme, as shown in table 2.
2 low-frequency load shedding prioritization scheme of table
(4) prioritization scheme for formulating the low-frequency load shedding scheme setting method proposed by the present invention for adapting to different capacity vacancy It is compared with former scheme, then validation verification can be carried out to method proposed by the present invention.As shown in figure 3, by electric ratio Original scheme steady frequency is lower when smaller (13.6%), and prioritization scheme increases the first run off-load amount on the basis of former scheme and is 8.5%, the off-load ratio of the first run time is properly increased, the recovery characteristics of mains frequency can be effectively improved.When being by electric ratio 35.5%, the load cut off after two schemes movement is also consistent, and steady frequency is also identical, but the frequency retrieval of prioritization scheme Effect is substantially better than former scheme.It can be seen that prioritization scheme in different energy equal under by electric ratio from Fig. 3 (a), (b), (c), (d) Guarantee that low-limit frequency is not less than 47.5Hz during catastrophe failure, has good adaptability.

Claims (3)

1. a kind of low-frequency load shedding scheme setting method for adapting to different capacity vacancy, which is characterized in that follow following basic principle:
1) guarantee that being effectively prevented from system frequency under different running method and Overload drops under dangerous point, does not send out Raw collapse of frequency；It is 48Hz in view of can use final stage operating frequency after certain safety margin.
2) system frequency should be able to be made to restore as early as possible to 49.5Hz~50Hz, do not make frequency toning, also do not make frequency long-term suspension；No Toning means that each stage load resection of low frequency load shedding equipment cannot be too big, and then requirement must have enough special wheels to hold for no hovering Amount.
3) when power shortage is smaller in system, less load should be cut as far as possible under the premise of guaranteeing frequency retrieval effect； The economy run from customer power supply reliability and system considers, it is desirable that low-frequency load shedding scheme has reasonable capacity in systems The method of salary distribution.
4) occurrence frequency does not collapse each island network after should ensure that off-the-line yet；It is required that low-frequency load shedding scheme both can satisfy entirely Requirement of the net to frequency, and adapt to the frequency characteristic of area power grid.
2. a kind of low-frequency load shedding scheme setting method for adapting to different capacity vacancy according to claim 1, feature exist In system frequency f meets the following conditions in the specific implementation process:
1) transient state low-limit frequency fmin> 47.5Hz avoids triggering unit underfrequency protection and interconnection low frequency off-the-line.
2) transient state highest frequency fmax< 51.5Hz guarantees mutually to coordinate with the protection of unit overfrequency.
3) steady frequency 49.5Hz≤f∞≤50.5Hz。
3. a kind of low-frequency load shedding scheme setting method for adapting to different capacity vacancy according to claims 1 and 2, feature It is, comprising the following steps:
1) it defines automatic low frequency load shed- ding device and is failure to actuate lower transient state low-limit frequency higher than 49Hz and when steady frequency is 49.5Hz Power shortage value is system reference vacancy power, is denoted as Pre.Therefore, power shortage amount P after disturbingd≤PreWhen, it is System can make in frequency retrieval to allowed band by spare capacity and itself fm capacity；Work as Pd> PreWhen, then it needs to open Dynamic low frequency load shedding equipment.
2) frequency threshold and delay are determined according to the practical operation situation of power grid.Wherein power shortage amount and each round off-load Amount is the percentage on the basis of total load amount in system, and frequency threshold and Index For Steady-state retain certain nargin.Wherein: Pshed.iIndicate the off-load amount of the i-th wheel；PdPower shortage amount in expression system；fiIndicate the frequency threshold of the i-th round；fminFor Frequency minimum in transient process；f∞For steady frequency.
3) adjustment start-up mode changes when the bet power for applying change, while Ma'an Mountain's subregion being disconnected simulating with Anhui major network Power miss fault, and calculate power shortage amount P at this timed, preferentially cut off Pshed=Pd-PreLoad, judgement at this time transient state frequency Rate minimum fminWhether f is equal to2(retain 0.05Hz nargin), be turn in next step, otherwise continue growing power shortage until fminEqual to f2。
4) off-load amount Δ P (cutting load amount increase is positive, and reduction is negative) is finely tuned, steady frequency f is made∞Restore to 49.50Hz~ Within the scope of 50.50Hz (reservation ± 0.5Hz nargin), to obtain the cutting load amount P of the 1st wheelshed.1=Pshed+ΔP。
5) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-PreIt is negative Lotus amount judges transient frequency minimum f at this timeminWhether f is equal to3(retain 0.05Hz nargin) is to turn in next step, otherwise after The continuous power shortage that increases is until fminEqual to f3。
6) off-load amount is finely tuned, steady frequency f is made∞Restore to (reservation ± 0.5Hz nargin) within the scope of 49.50Hz~50.50Hz, obtains To the 2nd round cut load Pshed.2=Pshed+ΔP-Pshed.1。
7) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-PreIt is negative Lotus amount judges transient frequency minimum f at this timeminWhether f is equal to4(retain 0.05Hz nargin) is to turn in next step, otherwise after The continuous power shortage that increases is until fminEqual to f4。
8) off-load amount is finely tuned, steady frequency f is made∞Restore to (reservation ± 0.5Hz nargin) within the scope of 49.50Hz~50.50Hz, obtains To the 3rd round cut load Pshed.3=Pshed+ΔP-Pshed.1-Pshed.2。
9) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=pd-PreIt is negative Lotus amount judges transient frequency minimum f at this timeminWhether f is equal to5(retain 0.05Hz nargin) is to turn in next step, otherwise after The continuous power shortage that increases is until fminEqual to f5。
10) off-load amount is finely tuned, steady frequency f is made∞Restore to (reservation ± 0.5Hz nargin) within the scope of 49.50Hz~50.50Hz, Obtain the 4th round cut load Pshed.4=Pshed+ΔP-Pshed.1-Pshed.2-Pshed.3。
11) bet power shortage degree is continued growing, and calculates power shortage amount P at this timed, preferentially cut off Pshed=Pd-PreIt is negative Lotus amount judges transient frequency minimum f at this timeminWhether it is equal to 47.5Hz (retaining 0.05Hz nargin), is to turn in next step, it is no Power shortage is then continued growing until fminEqual to 47.5Hz.
12) off-load amount is finely tuned, steady frequency f is made∞Restore to (reservation ± 0.5Hz nargin) within the scope of 49.50Hz~50.50Hz, Obtain the 5th round cut load Pshed.5=Pshed+ΔP-Pshed.1-Pshed.2-Pshed.3-Pshed.4。
13) the cutting load amount of each round, end loop are exported.
CN201810766707.1A 2018-07-13 2018-07-13 A kind of low-frequency load shedding scheme setting method adapting to different capacity vacancy Pending CN108964068A (en)

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CN113471987A (en) * 2021-05-28 2021-10-01 中国电力科学研究院有限公司 Method and system for determining high-frequency cutting scheme of water-light complementary system
WO2023010685A1 (en) * 2021-08-04 2023-02-09 国电南瑞科技股份有限公司 Method and system for online dynamic optimization and adjustment of control object of each round of under frequency load shedding
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Publication number Priority date Publication date Assignee Title
CN109659948A (en) * 2019-01-29 2019-04-19 华北电力大学 It is a kind of centralization low-frequency load shedding archipelago differentiate and control method
CN109659948B (en) * 2019-01-29 2021-04-30 华北电力大学 Centralized low-frequency load shedding multi-island judgment and control method
CN110165679A (en) * 2019-05-22 2019-08-23 南京理工大学 The adaptive cutting load method of meter and system frequency and voltage characteristic
CN110165679B (en) * 2019-05-22 2023-03-31 南京理工大学 Self-adaptive load shedding method considering system frequency and voltage characteristics
CN111952979A (en) * 2020-08-05 2020-11-17 广东电网有限责任公司 Control method and control system for power utilization load in substation
CN111952979B (en) * 2020-08-05 2023-05-26 广东电网有限责任公司 Method and system for controlling power consumption load in transformer substation
CN112311008A (en) * 2020-10-23 2021-02-02 葛洲坝能源重工有限公司 Load shedding control system for island power station
CN112311008B (en) * 2020-10-23 2022-11-22 葛洲坝能源重工有限公司 Load shedding control system for island power station
CN113471987A (en) * 2021-05-28 2021-10-01 中国电力科学研究院有限公司 Method and system for determining high-frequency cutting scheme of water-light complementary system
CN113471987B (en) * 2021-05-28 2023-08-22 中国电力科学研究院有限公司 Method and system for determining high-frequency cutting scheme of water-light complementary system
WO2023010685A1 (en) * 2021-08-04 2023-02-09 国电南瑞科技股份有限公司 Method and system for online dynamic optimization and adjustment of control object of each round of under frequency load shedding
CN116632858A (en) * 2023-06-07 2023-08-22 南京国电南自电网自动化有限公司 Self-provided power grid power control method based on electronic load

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