CN105207264B - Meter and the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines - Google Patents
Meter and the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines Download PDFInfo
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- CN105207264B CN105207264B CN201510690777.XA CN201510690777A CN105207264B CN 105207264 B CN105207264 B CN 105207264B CN 201510690777 A CN201510690777 A CN 201510690777A CN 105207264 B CN105207264 B CN 105207264B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/70—Wind energy
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Abstract
The invention discloses a kind of meter and the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines, not only counted when setting up the frequency security constraint of isolated LAN and Wind turbines grid-connected frequency constraint, consider requirement of the isolated LAN internal loading to frequency of supply simultaneously, the OPC definite value factors of unit in LAN, more meet user's actual need, ensure the accuracy of constraints, and quantify the control cost of each FREQUENCY CONTROL scheme, obtain considering the coordination optimization control program of control cost and control effect, preferable control effect can be obtained while control cost is reduced using this method, the frequency security of isolated LAN has been effectively ensured, have a good application prospect.
Description
Technical field
The invention belongs to the grid-connected Optimized-control Technique field of power system, and in particular to one kind is counted and Wind turbines are grid-connected will
The isolated LAN network frequencies optimal control method asked.
Background technology
Under the present situation of current energy shortage, new energy is all being greatly developed in countries in the world.Energy knot is carried forward vigorously in country
Under structure adjustment, development low-carbon clean energy resource and effort GHG emissions mitigation strategy and policy are guided, in " Renewable Energy Law " etc. one
Serial policy, the guidance of law and standard and foster down, China's regenerative resource, particularly wind-power electricity generation are developed rapidly.
The wind energy resources of China is mainly distributed on the sea wind area prevailing of northwest, northeast, Inner Mongol and southeastern coast, in recent years,
As a large amount of high energy-consuming enterprises adjourn to the ground such as northwest, northeast and Inner Mongol, on-site elimination approach is provided for new energy such as wind-powered electricity generations, and
So that supply network form is to development in pluralism.At present, use more supply network form for：High energy-consuming industry is relied on, is led to
Cross based on new energy such as wind-powered electricity generations, colm thermoelectricity for supplement the isolated LAN method of operation, promote wind-powered electricity generation directly with height
The combination of power consumption industry, realizes that the new energy such as wind-powered electricity generation are converted on the spot with highly energy-consuming combination and resource high-efficiency, is ensureing high consumption
While energy enterprise practical need for electricity, environmental emission reduction benefit is realized.
Bulk power system has the characteristics of installed capacity is big, spare capacity is sufficient, and the LAN of isolated operation, and installation is held
Amount is typically close with system load capacity, and the spare capacity of power network is less, and system response has larger difference with bulk power grid, therefore
It is easier to cause the big ups and downs of frequency during barrier, so as to cause frequency dangerous, particularly with the office of high permeability wind power integration
Domain net, the secondary pulse that the grid-connected frequency requirement of Wind turbines, failure rear fan off-grid are produced to system frequency etc. is all to isolated
The FREQUENCY CONTROL scheme of LAN proposes new challenge, if would potentially result in network system without effective FREQUENCY CONTROL scheme
Collapse.
Likewise, in view of the particularity of isolated LAN internal loading (electrolytic aluminium, steel-making, chemical industry etc.) frequency requirement, power network
The security constraint of frequency should more consider to net the demand of interior user in system, and relevant at present mains frequency security constraint
Standard is that, from power network angle, the frequency security constraint in isolated LAN can not indiscriminately imitate the standard of bulk power grid, and should mostly
Determined according to oneself practical operation situation how to carry out isolated LAN network frequencies optimal control, be current urgent problem.
The content of the invention
Technical problem solved by the invention is the frequency optimization control for the isolated LAN for overcoming high permeability wind power integration
Problem processed.The isolated LAN network frequencies optimal control method of the grid-connected requirement of meter and Wind turbines of the present invention, can reduce control
Preferable control effect is obtained while cost, the frequency security of isolated LAN has been effectively ensured, before good application
Scape.
In order to solve to reach above-mentioned purpose, the technical solution adopted in the present invention is：
A kind of meter and the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines, it is characterised in that：Including
Following steps,
Step (A), to isolate LAN be modeled and fault set screening, by time-domain-simulation observe failure under isolate
The disturbed track of frequency of LAN；
Step (B), the load in the grid-connected frequency constraint of meter and Wind turbines, isolated LAN is wanted to frequency of supply
The OPC definite value factors of unit in LAN are sought, isolated, is adjusted, is met on the basis of mains frequency security regulations
The isolated LAN network frequencies security constraint of practical operation situation, the frequency security of isolated LAN is constrained to y (fl,fh), wherein,
fhAnd flThe upper limit value and lower limit value of frequency security constraint is represented respectively；
Step (C), according under failure isolate LAN the disturbed track of frequency, with reference to isolated LAN frequency security about
Beam, judges whether the frequency of isolated LAN is safe, if safety, exits optimization；Otherwise, into step (D)；
Step (D), based on controllable measure space, to control Least-cost as optimization aim, the power for isolating LAN is put down
Weighing apparatus is constraints with frequency security, sets up optimization object function, using optimized algorithm, tries to achieve the frequency optimization of isolated LAN
Control program,
(D1) shown in, the optimization object function of foundation, such as formula (1),
min Lsum(X, λ)
X=(x1, x2... ..xn)
λ=(λ1, λ2... .. λn) (1)
Constraints f (t) ∈ y (fl,fh)
PG(t)+PW(t)≥PL(t)
UL≤Ui≤UH
Wherein, X is the set in optional control measure space, x1, x2... ..xnFor each control measure space, λ is each control
The set of the corresponding control cost of measure, λ1, λ2... .. λnFor the corresponding control cost of each control measure, Lsum(X, λ) is total
Control cost, min Lsum(X, λ) is total minimum control cost, and f (t) represents that t isolates the frequency of LAN system
Value, PG(t) it is the power output of t period conventional power units, PW(t) it is the power output of t period Wind turbines, PL(t) it is the t periods
Power needed for isolated LAN internal loading, UiFor power network interior nodes voltage, UH、ULRespectively voltage security constrains upper and lower limit；
(D2) optimization constraints constitutes new object function minL to be placed in the form of penalty function in object functionsum,
As shown in formula (2),
minLsum=Lsum(I)+σ1·g2+σ2·h2 (2)
Wherein：Lsum(I) it is former object function, σ1And σ2It is penalty factor, g is the constraints of inequality；H is equation
Constraints；
(D3) new object function minLsum is solved using optimized algorithm, the frequency for obtaining isolated LAN system is excellent
Change control measure.
The isolated LAN network frequencies optimal control method of the foregoing grid-connected requirement of meter and Wind turbines, it is characterised in that：
(D1) the corresponding control cost of each control measure, calculates according to formula (3) and obtains,
Wherein, λiFor the corresponding control cost of i-th of control measure in control measure space, m is in the control measure
The unit number of excision, δjTo cut off the control cost of j-th of unit；τ、PLRespectively lose the control cost of specific load and be somebody's turn to do
The load that LAN system loses is isolated under control measure.
The isolated LAN network frequencies optimal control method of the foregoing grid-connected requirement of meter and Wind turbines, it is characterised in that：Step
Suddenly requirement (B), by the load in the grid-connected frequency constraint of meter and Wind turbines, isolated LAN to frequency of supply, isolated office
The OPC definite value factors of unit, are adjusted on the basis of mains frequency security regulations in the net of domain, and the mains frequency is advised safely
It is set to《Power system security stability Calculation technical specification》With《Wind power plant access power system technology regulation》.
The beneficial effects of the invention are as follows：The isolated LAN network frequencies optimization control of the grid-connected requirement of meter and Wind turbines of the present invention
Method processed, not only counted when setting up the frequency security constraint of isolated LAN and Wind turbines grid-connected frequency constraint, examine simultaneously
Considered requirement of the isolated LAN internal loading to frequency of supply, in LAN unit OPC definite value factors, more meet user actual
Demand, it is ensured that the accuracy of constraints, and quantify the control cost of each FREQUENCY CONTROL scheme, obtain considering control cost
With the coordination optimization control program of control effect, preferably control can be obtained while control cost is reduced using this method and imitated
Really, the frequency security of isolated LAN has been effectively ensured, has had a good application prospect.
Brief description of the drawings
Fig. 1 be the present invention meter and the grid-connected requirement of Wind turbines isolated LAN network frequencies optimal control method flow
Figure.
Fig. 2 is the formulation flow chart of the frequency security constraint of the isolated LAN of the present invention.
Fig. 3 is the schematic diagram of the requirement of wind farm grid-connected frequency.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
The isolated LAN network frequencies optimal control method of the grid-connected requirement of meter and Wind turbines of the present invention, is setting up isolated office
Domain net frequency security constraint when not only count and Wind turbines grid-connected frequency constraint, while considering isolated LAN internal loading
The OPC definite value factors of unit, more meet user's actual need, it is ensured that constraints in requirement, LAN to frequency of supply
Accuracy, and quantify the control cost of each FREQUENCY CONTROL scheme, obtain considering control cost and the coordination of control effect is excellent
Change control program, preferable control effect can be obtained while control cost is reduced using this method, be effectively ensured isolated
The frequency security of LAN, as shown in figure 1, following steps are specifically included,
Step (A), to isolate LAN be modeled and fault set screening, by time-domain-simulation observe failure under isolate
The disturbed track of frequency of LAN；
Step (B), the load in the grid-connected frequency constraint of meter and Wind turbines, isolated LAN is wanted to frequency of supply
The OPC definite value factors of unit in LAN are sought, isolated, is adjusted, is met on the basis of mains frequency security regulations
The isolated LAN network frequencies security constraint of practical operation situation, the frequency security of isolated LAN is constrained to y (fl,fh), wherein,
fhAnd flThe upper limit value and lower limit value of frequency security constraint is represented respectively；
The mains frequency security regulations are《Power system security stability Calculation technical specification》With《Wind power plant accesses electric power
Systems technology is provided》, wherein LAN network frequencies security constraint is not directly to continue to use《Power system security stability Calculation technology is advised
Model》To the regulation of mains frequency safety, but in this, as reference, in the grid-connected frequency constraints of meter and Wind turbines, LAN
The factor such as OPC definite values of unit in requirement of the load to frequency of supply, LAN, determines the frequency security constraint of LAN, more
Tally with the actual situation, as shown in Figure 2；Wherein, the grid-connected frequency constraint of Wind turbines refers to according to national standard《Wind power plant is accessed
Power system technology is provided》Grid-connected frequency to wind power plant proposes requirement：, can be according to wind-powered electricity generation when wind-powered electricity generation field frequencies range is less than 48Hz
The interior Wind turbines in field allow depending on the low-limit frequency of operation；When frequency is between 48Hz-49.5Hz, it is desirable to which wind power plant has
At least run 30min ability；When frequency is between 49.5Hz-50.2Hz, continuously can normally it run；Frequency is higher than
During 50.2Hz, it is desirable to which wind power plant has an ability at least running 5min, and perform that dispatching of power netwoks department assigns cut machine plan high week
Slightly, do not allow the Wind turbines of stopped status grid-connected, as shown in Figure 3；
Step (C), according under failure isolate LAN the disturbed track of frequency, with reference to isolated LAN frequency security about
Beam, judges whether the frequency of isolated LAN is safe, if safety, exits optimization；Otherwise, into step (D)；
Step (D), based on controllable measure space, to control Least-cost as optimization aim, the power for isolating LAN is put down
Weighing apparatus is constraints with frequency security, sets up optimization object function, using optimized algorithm, tries to achieve the frequency optimization of isolated LAN
Control program,
(D1) shown in, the optimization object function of foundation, such as formula (1),
min Lsum(X, λ)
X=(x1, x2... ..Xn)
λ=(λ1, λ2... .. λn) (1)
Constraints f (t) ∈ y (fl,fh)
PG(t)+PW(t)≥PL(t)
UL≤Ui≤UH
Wherein, X is the set in optional control measure space, x1, x2... ..xnFor each control measure space, λ is each control
The set of the corresponding control cost of measure, λ1, λ2... .. λnFor the corresponding control cost of each control measure, Lsum(X, λ) is total
Control cost, min Lsum(X, λ) is total minimum control cost, and f (t) represents that t isolates the frequency of LAN system
Value, PG(t) it is the power output of t period conventional power units, conventional power unit includes current thermoelectricity, water power, Gas Generator Set, diesel engine
Group etc. is exerted oneself stable unit, PW(t) it is the power output of t period Wind turbines, PL(t) LAN internal loading is isolated for the t periods
Required power, UiFor power network interior nodes voltage, UH、ULRespectively voltage security constrains upper and lower limit；
The corresponding control cost of each control measure, calculates according to formula (3) and obtains,
Wherein, λiFor the corresponding control cost of i-th of control measure in control measure space, m is in the control measure
The unit number of excision, δjTo cut off the control cost of j-th of unit；τ、PLRespectively lose the control cost of specific load and be somebody's turn to do
The load that LAN system loses is isolated under control measure；
(D2) optimization constraints constitutes new object function minL to be placed in the form of penalty function in object functionsum,
As shown in formula (2),
minLsum=Lsum(I)+σ1·g2+σ2·h2 (2)
Wherein：Lsum(I) it is former object function, σ1And σ2It is penalty factor, g is the constraints of inequality；H is equation
Constraints；
(D3) new object function minLsum is solved using optimized algorithm, the frequency for obtaining isolated LAN system is excellent
Change control measure, the optimized algorithm includes particle cluster algorithm of the prior art, genetic algorithm etc., can solved.
General principle, principal character and the advantage of the present invention has been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, the original for simply illustrating the present invention described in above-described embodiment and specification
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (2)
1. meter and the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines, it is characterised in that：Including following step
Suddenly,
Step (A), to isolate LAN be modeled and fault set screening, pass through time-domain-simulation observe failure under isolate local
The disturbed track of frequency of net；
Step (B), by count and the grid-connected frequency constraints of Wind turbines, isolated LAN in requirement of the load to frequency of supply,
The OPC definite value factors of unit, are adjusted on the basis of mains frequency security regulations, obtain meeting reality in isolated LAN
The isolated LAN network frequencies security constraint of running situation, the frequency security of isolated LAN is constrained to y (fl,fh), wherein, fhWith
flThe upper limit value and lower limit value of frequency security constraint is represented respectively；
Step (C), according to the disturbed track of frequency that LAN is isolated under failure, is constrained with reference to the frequency security of isolated LAN,
Judge whether the frequency of isolated LAN is safe, if safety, exits optimization；Otherwise, into step (D)；
Step (D), based on controllable measure space, to control Least-cost as optimization aim, isolate LAN power-balance and
Frequency security is constraints, sets up optimization object function, using optimized algorithm, tries to achieve the frequency optimization control of isolated LAN
Scheme,
(D1) optimization object function set up, shown in such as formula (1),
min Lsum(X, λ)
X=(x1, x2... xn)
λ=(λ1, λ2... .. λn) (1)
Constraints f (t) ∈ y (fl,fh)
PG(t)+PW(t)≥PL(t)
UL≤Ui≤UH
Wherein, X is the set in optional control measure space, x1, x2... ..xnFor each control measure space, λ arranges for each control
Apply the set of the corresponding control cost of space difference, λ1, λ2... .. λnDistinguish corresponding control generation for each control measure space
Valency, Lsum(X, λ) is total control cost, minLsum(X, λ) is total minimum control cost, and f (t) represents that t isolates local
The frequency values of net system, PG(t) it is the power output of t period conventional power units, PW(t) it is the power output of t period Wind turbines,
PL(t) for the power needed for the t periods isolate LAN internal loading, UiFor power network interior nodes voltage, UH、ULRespectively voltage security
Constrain upper and lower limit；
(D2) optimization constraints constitutes new object function minL to be placed in the form of penalty function in object functionsum, it is such as public
Shown in formula (2),
minLsum=Lsum(I)+σ1·g2+σ2·h2 (2)
Wherein：Lsum(I) it is former object function, σ1And σ2It is penalty factor, g is the constraints of inequality；H is equality constraint
Condition；
(D3) using optimized algorithm to new object function minLsumSolve, obtain the frequency optimization control of isolated LAN system
Measure；
Wherein, the corresponding control cost in (D1) each control measure space, calculates according to formula (3) and obtains,
Wherein, λiFor the corresponding control cost in i-th of control measure space in control measure spatial aggregation, m is the control measure
The unit number cut off in space, δjTo cut off the control cost of j-th of unit；τ、PLRespectively lose the control generation of specific load
The load that LAN system loses is isolated under valency and the control measure space.
2. meter according to claim 1 and the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines, its
It is characterised by：Step (B), by the load in the grid-connected frequency constraint of meter and Wind turbines, isolated LAN to frequency of supply
It is required that, in isolated LAN unit OPC definite value factors, be adjusted on the basis of mains frequency security regulations, the electricity
Net frequency security is defined as《Power system security stability Calculation technical specification》With《Wind power plant access power system technology regulation》.
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| CN102522781A (en) * | 2011-12-26 | 2012-06-27 | 国电南瑞科技股份有限公司 | Method for participating area control error (ACE) control by uniformly modeling wind power plant and thermal power plant |
| CN103311940A (en) * | 2013-07-08 | 2013-09-18 | 东南大学 | Integrated control method for micro-grid load and energy accumulation |
| CN103825279A (en) * | 2014-02-21 | 2014-05-28 | 华南理工大学 | Micro-grid system voltage stability control method based on robust control |
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| US20110153096A1 (en) * | 2009-12-22 | 2011-06-23 | Sujan Kumar Pal | Method and system for monitoring operation of a wind farm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102522781A (en) * | 2011-12-26 | 2012-06-27 | 国电南瑞科技股份有限公司 | Method for participating area control error (ACE) control by uniformly modeling wind power plant and thermal power plant |
| CN103311940A (en) * | 2013-07-08 | 2013-09-18 | 东南大学 | Integrated control method for micro-grid load and energy accumulation |
| CN103825279A (en) * | 2014-02-21 | 2014-05-28 | 华南理工大学 | Micro-grid system voltage stability control method based on robust control |
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