CN105207264A - Frequency optimization control method considering grid connection demand of wind turbine unit for isolated local area network - Google Patents

Frequency optimization control method considering grid connection demand of wind turbine unit for isolated local area network Download PDF

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CN105207264A
CN105207264A CN201510690777.XA CN201510690777A CN105207264A CN 105207264 A CN105207264 A CN 105207264A CN 201510690777 A CN201510690777 A CN 201510690777A CN 105207264 A CN105207264 A CN 105207264A
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lan
frequency
local area
area network
isolated
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CN105207264B (en
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董宸
夏彦辉
邹宇
王强强
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Nanjing SAC Automation Co Ltd
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    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The invention discloses a frequency optimization control method considering grid connection demand of a wind turbine unit for an isolated local area network. The frequency optimization control method considers not only the grid connection frequency restriction of the wind turbine unit but also the demand on power supply frequency from a load in the isolated local area network and the OPC constant-value factor of the unit in the local area network, more conforms to the actual demands of users, guarantees the accuracy of constraint conditions, and quantifies the control cost of all frequency control schemes to obtain an coordinated optimal control scheme which comprehensively considers the control cost and the control effect. The frequency optimization control method can obtain a relatively good control effect while lowering the control cost, effectively guarantees the frequency security of the isolated local area network and has a favorable application prospect.

Description

Take into account the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines
Technical field
The invention belongs to the grid-connected Optimized-control Technique field of electric power system, be specifically related to a kind of isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines.
Background technology
Under current energy starved present situation, new forms of energy are all being greatly developed in countries in the world.Under country carries forward vigorously Energy restructuring, development low-carbon (LC) clean energy resource and the guide of effort GHG emissions mitigation strategy and policy, in the guidance of a series of policy, law and standards such as " Renewable Energy Laws " with under fostering, China's regenerative resource, particularly wind power generation develops rapidly.
The wind energy resources of China is mainly distributed in the sea wind district prevailing of northwest, northeast, Inner Mongol and southeastern coast, in recent years, adjourn to the ground such as northwest, northeast and Inner Mongol along with a large amount of high energy-consuming enterprises, for the new forms of energy such as wind-powered electricity generation provide on-site elimination approach, and make supply network form to development in pluralism.At present, more supply network form is adopted to be: to rely on high energy-consuming industry, by based on new forms of energy such as wind-powered electricity generations, colm thermoelectricity is supplementary isolated local area network (LAN) operational mode, promote wind-powered electricity generation directly and the combination of high energy-consuming industry, realize the new forms of energy such as wind-powered electricity generation and highly energy-consuming combination and resource high-efficiency to transform on the spot, while the actual need for electricity of guarantee high energy-consuming enterprises, realize environmental emission reduction benefit.
It is large that bulk power system has installed capacity, the feature of reserve capacity abundance, and the local area network (LAN) of isolated operation, installed capacity is general close with system load capacity, the reserve capacity of electrical network is less, system response and bulk power grid have larger difference, the big ups and downs of frequency are more easily caused during fault, thus cause frequency dangerous, especially for the local area network (LAN) of high permeability wind power integration, the grid-connected frequency requirement of Wind turbines, fault rear fan off-grid all proposes new challenge to the FREQUENCY CONTROL scheme of isolated local area network (LAN) to the secondary pulse etc. that system frequency produces, if do not have effective FREQUENCY CONTROL scheme may cause the collapse of network system.
Same, in view of the particularity of isolated local area network (LAN) internal loading (electrolytic aluminium, steel-making, chemical industry etc.) frequency requirement, in network system, the security constraint of frequency more should consider the demand of netting interior user, and mostly the standard of mains frequency security constraint relevant is at present from electrical network angle, frequency security constraint in isolated local area network (LAN) can not indiscriminately imitate the standard of bulk power grid, and should determine according to oneself practical operation situation, how carrying out isolated LAN network frequencies optimal control, is current urgent problem.
Summary of the invention
Technical problem solved by the invention is the frequency optimization control problem of the isolated local area network (LAN) overcoming high permeability wind power integration.The isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines of the present invention, can obtain good control effects, effectively ensure that the frequency security of isolated local area network (LAN), have a good application prospect while minimizing controls cost.
Achieve the above object to solve, the technical solution adopted in the present invention is:
Take into account an isolated LAN network frequencies optimal control method for the grid-connected requirement of Wind turbines, it is characterized in that: comprise the following steps,
Step (A), carries out the screening of modeling and fault set to isolated local area network (LAN), the disturbed track of frequency of isolated local area network (LAN) under observing fault by time-domain-simulation;
Step (B), the OPC definite value factor of unit in the requirement of the load in the grid-connected frequency constraint of Wind turbines, isolated local area network (LAN) to frequency of supply, isolated local area network (LAN) will be taken into account, at the enterprising Row sum-equal matrix in the basis of mains frequency security regulations, obtain the isolated LAN network frequencies security constraint of realistic ruuning situation, the frequency security of isolated local area network (LAN) is constrained to y (f l, f h), wherein, f hand f lrepresent the upper limit value and lower limit value of frequency security constraint respectively;
Step (C), according to the disturbed track of frequency of local area network (LAN) isolated under fault, combines the frequency security constraint of isolated local area network (LAN), judges to isolate the frequency whether safety of local area network (LAN), if safety, then exits optimization; Otherwise, enter step (D);
Step (D), based on can control means space, to control Least-cost for optimization aim, power-balance and the frequency security of isolated local area network (LAN) are constraints, set up optimization object function, utilize optimized algorithm, try to achieve the frequency optimization control program of isolated local area network (LAN)
(D1), the optimization object function of foundation, as shown in formula (1),
minL sum(X，λ)
X＝(x 1，x 2，.....x n)
λ＝(λ 1，λ 2，.....λ n)(1)
Constraints f (t) ∈ y (f l, f h)
P G(t)+P W(t)≥P L(t)
U L≤U i≤U H
Wherein, X is the set in optional control measure space, x 1, x 2... ..x nfor each control measure space, λ is the set of control cost corresponding to each control measure, λ 1, λ 2... .. λ nfor the control cost that each control measure are corresponding, L sum(X, λ) is total control cost, minL sum(X, λ) is total minimum control cost, and f (t) represents that t isolates the frequency values of LAN system, P gt () is the power output of t period conventional power unit, P wt () is the power output of t period Wind turbines, P lt () isolates the power needed for local area network (LAN) internal loading, U for the t period ifor electrical network interior nodes voltage, U h, U lbe respectively voltage security constraint upper and lower limit;
(D2) optimize constraints and be placed in target function with the form of penalty function, form new target function minL sum, as shown in formula (2),
minL sum＝L sum(I)+σ 1·g 2+σ 2·h 2(2)
Wherein: L sum(I) be former target function, σ 1and σ 2be penalty factor, g is the constraints of inequality; H is equality constraint;
(D3) adopt optimized algorithm to solve new target function minLsum, obtain the frequency optimization control measure of isolated LAN system.
The aforesaid isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines, is characterized in that: the control cost that (D1) each control measure are corresponding, calculates according to formula (3),
λ i = Σ j = 1 m δ j + τ * P L - - - ( 3 )
Wherein, λ ifor the control cost that the control measure of i-th in control measure space are corresponding, m is the unit number excised in these control measure, δ jfor the control cost of an excision jth unit; τ, P lthe load that under being respectively the control cost and these control measure losing specific load, isolated LAN system loses.
The aforesaid isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines, it is characterized in that: step (B), the OPC definite value factor of unit in the requirement of the load in the grid-connected frequency constraint of Wind turbines, isolated local area network (LAN) to frequency of supply, isolated local area network (LAN) will be taken into account, at the enterprising Row sum-equal matrix in the basis of mains frequency security regulations, described mains frequency security regulations are " power system safety and stability computing technique specification " and " wind energy turbine set access power system technology regulation ".
The invention has the beneficial effects as follows: the isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines of the present invention, the grid-connected frequency constraint of Wind turbines is not only taken into account when the frequency security constraint of setting up isolated local area network (LAN), consider isolated local area network (LAN) internal loading to the requirement of frequency of supply simultaneously, the OPC definite value factor of unit in local area network (LAN), more meet user's actual need, ensure the accuracy of constraints, and quantize the control cost of each FREQUENCY CONTROL scheme, obtain considering the coordination optimization control program controlling cost and control effects, adopt the method can obtain good control effects while minimizing controls cost, effectively ensure that the frequency security of isolated local area network (LAN), have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the flow chart taking into account the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines of the present invention.
Fig. 2 is the formulation flow chart of the frequency security constraint of isolated local area network (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 taking into account the grid-connected requirement of Wind turbines of the present invention, the grid-connected frequency constraint of Wind turbines is not only taken into account when the frequency security constraint of setting up isolated local area network (LAN), consider isolated local area network (LAN) internal loading to the requirement of frequency of supply simultaneously, the OPC definite value factor of unit in local area network (LAN), more meet user's actual need, ensure the accuracy of constraints, and quantize the control cost of each FREQUENCY CONTROL scheme, obtain considering the coordination optimization control program controlling cost and control effects, adopt the method can obtain good control effects while minimizing controls cost, effectively ensure that the frequency security of isolated local area network (LAN), as shown in Figure 1, specifically comprise the following steps,
Step (A), carries out the screening of modeling and fault set to isolated local area network (LAN), the disturbed track of frequency of isolated local area network (LAN) under observing fault by time-domain-simulation;
Step (B), the OPC definite value factor of unit in the requirement of the load in the grid-connected frequency constraint of Wind turbines, isolated local area network (LAN) to frequency of supply, isolated local area network (LAN) will be taken into account, at the enterprising Row sum-equal matrix in the basis of mains frequency security regulations, obtain the isolated LAN network frequencies security constraint of realistic ruuning situation, the frequency security of isolated local area network (LAN) is constrained to y (f l, f h), wherein, f hand f lrepresent the upper limit value and lower limit value of frequency security constraint respectively;
Described mains frequency security regulations are " power system safety and stability computing technique specification " and " wind energy turbine set access power system technology regulation ", wherein LAN network frequencies security constraint is not directly continue to use " power system safety and stability computing technique specification " regulation to mains frequency safety, but in this, as reference, take into account the grid-connected frequency constraint of Wind turbines, local area network (LAN) internal loading to factors such as the OPC definite values of unit in the requirement of frequency of supply, local area network (LAN), determine the frequency security constraint of local area network (LAN), more tally with the actual situation, as shown in Figure 2; Wherein, the grid-connected frequency constraint of Wind turbines refers to and proposes requirement according to national standard " wind energy turbine set access power system technology regulation " to the grid-connected frequency of wind energy turbine set: when wind energy turbine set frequency is lower than 48Hz, can allow according to Wind turbines in wind energy turbine set the low-limit frequency run and determine; When frequency is between 48Hz-49.5Hz, require that wind energy turbine set has the ability at least running 30min; When frequency is between 49.5Hz-50.2Hz, can normally run continuously; When frequency is higher than 50.2Hz, require that wind energy turbine set has the ability at least running 5min, and perform that dispatching of power netwoks department assigns height week cut machine strategy, do not allow the Wind turbines of stopped status grid-connected, as shown in Figure 3;
Step (C), according to the disturbed track of frequency of local area network (LAN) isolated under fault, combines the frequency security constraint of isolated local area network (LAN), judges to isolate the frequency whether safety of local area network (LAN), if safety, then exits optimization; Otherwise, enter step (D);
Step (D), based on can control means space, to control Least-cost for optimization aim, power-balance and the frequency security of isolated local area network (LAN) are constraints, set up optimization object function, utilize optimized algorithm, try to achieve the frequency optimization control program of isolated local area network (LAN)
(D1), the optimization object function of foundation, as shown in formula (1),
minL sum(X，λ)
X＝(x 1，x 2，.....X n)
λ＝(λ 1，λ 2，.....λ n)(1)
Constraints f (t) ∈ y (f l, f h)
P G(t)+P W(t)≥P L(t)
U L≤U i≤U H
Wherein, X is the set in optional control measure space, x 1, x 2... ..x nfor each control measure space, λ is the set of control cost corresponding to each control measure, λ 1, λ 2... .. λ nfor the control cost that each control measure are corresponding, L sum(X, λ) is total control cost, minL sum(X, λ) is total minimum control cost, and f (t) represents that t isolates the frequency values of LAN system, P gt () comprises the stable units of exerting oneself such as current thermoelectricity, water power, Gas Generator Set, diesel engine unit, P for the power output of t period conventional power unit, conventional power unit wt () is the power output of t period Wind turbines, P lt () isolates the power needed for local area network (LAN) internal loading, U for the t period ifor electrical network interior nodes voltage, U h, U lbe respectively voltage security constraint upper and lower limit;
The control cost that each control measure are corresponding, calculates according to formula (3),
λ i = Σ j = 1 m δ j + τ * P L - - - ( 3 )
Wherein, λ ifor the control cost that the control measure of i-th in control measure space are corresponding, m is the unit number excised in these control measure, δ jfor the control cost of an excision jth unit; τ, P lthe load that under being respectively the control cost and these control measure losing specific load, isolated LAN system loses;
(D2) optimize constraints and be placed in target function with the form of penalty function, form new target function minL sum, as shown in formula (2),
minL sum＝L sum(I)+σ 1·g 2+σ 2·h 2(2)
Wherein: L sum(I) be former target function, σ 1and σ 2be penalty factor, g is the constraints of inequality; H is equality constraint;
(D3) adopt optimized algorithm to solve new target function minLsum, obtain the frequency optimization control measure of isolated LAN system, described optimized algorithm comprises particle cluster algorithm of the prior art, genetic algorithm etc., all can solve.
More than show and describe general principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.

Claims (3)

1. take into account the isolated LAN network frequencies optimal control method of the grid-connected requirement of Wind turbines, it is characterized in that: comprise the following steps,
Step (A), carries out the screening of modeling and fault set to isolated local area network (LAN), the disturbed track of frequency of isolated local area network (LAN) under observing fault by time-domain-simulation;
Step (B), the OPC definite value factor of unit in the requirement of the load in the grid-connected frequency constraint of Wind turbines, isolated local area network (LAN) to frequency of supply, isolated local area network (LAN) will be taken into account, at the enterprising Row sum-equal matrix in the basis of mains frequency security regulations, obtain the isolated LAN network frequencies security constraint of realistic ruuning situation, the frequency security of isolated local area network (LAN) is constrained to y (f l, f h), wherein, f hand f lrepresent the upper limit value and lower limit value of frequency security constraint respectively;
Step (C), according to the disturbed track of frequency of local area network (LAN) isolated under fault, combines the frequency security constraint of isolated local area network (LAN), judges to isolate the frequency whether safety of local area network (LAN), if safety, then exits optimization; Otherwise, enter step (D);
Step (D), based on can control means space, to control Least-cost for optimization aim, power-balance and the frequency security of isolated local area network (LAN) are constraints, set up optimization object function, utilize optimized algorithm, try to achieve the frequency optimization control program of isolated local area network (LAN)
(D1), the optimization object function of foundation, as shown in formula (1),
minL sum(X，λ)
X＝(x 1，x 2，.....x n)
λ＝(λ 1，λ 2，.....λ n)(1)
Constraints f (t) ∈ y (f l, f h)
P G(t)+P W(t)≥P L(t)
U L≤U i≤U H
Wherein, X is the set in optional control measure space, x 1, x 2... ..x nfor each control measure space, λ is the set of control cost corresponding to each control measure, λ 1, λ 2... .. λ nfor the control cost that each control measure are corresponding, L sum(X, λ) is total control cost, minL sum(X, λ) is total minimum control cost, and f (t) represents that t isolates the frequency values of LAN system, P gt () is the power output of t period conventional power unit, P wt () is the power output of t period Wind turbines, P lt () isolates the power needed for local area network (LAN) internal loading, U for the t period ifor electrical network interior nodes voltage, U h, U lbe respectively voltage security constraint upper and lower limit;
(D2) optimize constraints and be placed in target function with the form of penalty function, form new target function minL sum, as shown in formula (2),
minL sum＝L sum(I)+σ 1·g 2+σ 2·h 2(2)
Wherein: L sum(I) be former target function, σ 1and σ 2be penalty factor, g is the constraints of inequality; H is equality constraint;
(D3) adopt optimized algorithm to solve new target function minLsum, obtain the frequency optimization control measure of isolated LAN system.
2. the isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines according to claim 1, is characterized in that: the control cost that (D1) each control measure are corresponding, calculates according to formula (3),
λ i = Σ j = 1 m δ j + τ * P L - - - ( 3 )
Wherein, λ ifor the control cost that the control measure of i-th in control measure space are corresponding, m is the unit number excised in these control measure, δ jfor the control cost of an excision jth unit; τ, P lthe load that under being respectively the control cost and these control measure losing specific load, isolated LAN system loses.
3. the isolated LAN network frequencies optimal control method taking into account the grid-connected requirement of Wind turbines according to claim 1, it is characterized in that: step (B), the OPC definite value factor of unit in the requirement of the load in the grid-connected frequency constraint of Wind turbines, isolated local area network (LAN) to frequency of supply, isolated local area network (LAN) will be taken into account, at the enterprising Row sum-equal matrix in the basis of mains frequency security regulations, described mains frequency security regulations are " power system safety and stability computing technique specification " and " wind energy turbine set access power system technology regulation ".
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Cited By (2)

* Cited by examiner, † Cited by third party
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CN107482678A (en) * 2017-08-15 2017-12-15 重庆大学 A kind of double-fed fan motor field is through soft direct join net system failure traversing control method
CN110570080A (en) * 2019-07-23 2019-12-13 南京国电南自电网自动化有限公司 startup control method, device and system for enterprise self-contained power grid

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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
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

Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107482678A (en) * 2017-08-15 2017-12-15 重庆大学 A kind of double-fed fan motor field is through soft direct join net system failure traversing control method
CN107482678B (en) * 2017-08-15 2019-09-06 重庆大学 A kind of double-fed fan motor field is through soft direct join net system failure traversing control method
CN110570080A (en) * 2019-07-23 2019-12-13 南京国电南自电网自动化有限公司 startup control method, device and system for enterprise self-contained power grid
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