CN103441534A - Strategy for controlling matching of traditional unit and energy storage system in AGC system - Google Patents

Strategy for controlling matching of traditional unit and energy storage system in AGC system Download PDF

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CN103441534A
CN103441534A CN2013103110916A CN201310311091A CN103441534A CN 103441534 A CN103441534 A CN 103441534A CN 2013103110916 A CN2013103110916 A CN 2013103110916A CN 201310311091 A CN201310311091 A CN 201310311091A CN 103441534 A CN103441534 A CN 103441534A
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conventional rack
energy
agc
storage system
deviation
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CN103441534B (en
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张放
谢旭
胡泽春
张晶
宋永华
施磊
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Tsinghua University
North China Grid Co Ltd
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North China Grid Co Ltd
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Abstract

The invention discloses a strategy for controlling matching of a traditional unit and an energy storage system in an AGC system. The strategy comprises the following steps: obtaining the frequency deviation and the call wire switching power deviation from a data acquisition and supervisory control system, and computing area control deviation; computing system adjustment required power according to the area control deviation; distributing the system adjustment required power to the traditional unit, and computing target output of the traditional unit; computing the largest adjustment capability of the traditional unit in the current AGC period; distributing remaining adjustment power to the energy storage system to be borne; checking and issuing a command, and finishing the current AGC period. The strategy is beneficial to rapidly restraining fluctuation of the frequency of an electric system and fluctuation of the call wire switching power, and can reduce the requirement of the electric system for the frequency modulation capacity, or improve the frequency modulation control effect under the situation that the frequency modulation capacity is changeless. The achieved method is simple, the operation amount is barely added, meanwhile, the requirement for the hardware environment of a control system is low, and larger changes for an existing AGC system is not required.

Description

The control strategy that in the AGC system, conventional rack coordinates with energy-storage system
Technical field
The invention belongs to electric power system automatic generation control (Automatic Generation Control, AGC) field, a kind of control strategy that conventional rack coordinates with energy-storage system in the AGC system.
Background technology
The frequency of electric power system is an important indicator of the quality of power supply, for safety, the stable operation of maintenance system, and the protection power equipment, system frequency need to maintain in metastable scope.The GB GB/T15945-2008 of China regulation, the frequency departure allowed band of large-scale power system be the frequency rated value 4 ‰ in.Frequency modulation is as one of electric power system important assistant service, and purpose is to transfer the short term variations that unit output is followed load in time, guarantees the frequency stabilization of system.
In recent years, in environmental pollution, greenhouse, increasingly sharpen, under the day by day exhausted overall background of fossil energy, the development of the new forms of energy such as wind-powered electricity generation, solar energy is extremely swift and violent.Yet, wind energy and solar energy exert oneself there is intermittence, exerting oneself changes fast characteristics, carries out also difficulty comparatively of short-term forecast to exerting oneself.For guaranteeing the safe operation of system, more frequency regulation capacity (usually being provided by traditional fossil fuel unit) is provided system, makes the purchase cost of assistant service improve, and the wearing and tearing of frequency modulation unit increase the weight of; In the higher area of part wind-powered electricity generation penetrance, the wind of having to often be abandoned, cause the waste of clean energy resource.In addition, take fired power generating unit as main northern area, a large amount of heat supply units need electricity determining by heat in the winter time, adjustable range is seriously limited, cause the shortage of system frequency regulation capacity, receiving ability to intermittent regenerative resource further descends, and causes huge economic loss, is unfavorable for the realization of the target of national energy-saving environmental protection and carbon emission reduction.
With conventional rack, compare, energy-storage system has that the climbing rate is high, the advantage of fast response time, the fluctuation that system for tracking load and intermittent regenerative resource are exerted oneself fast, these characteristics make energy-storage system have natural performance advantage in the frequency modulation application, there is certain competitiveness in the frequency modulation service market, contribute to alleviate the frequency modulation difficulty that the extensive access of wind-powered electricity generation brings, obtained more concern in recent years." energy-storage system improves the research and development of fitful power access capability key technology " is put into country's " 863 Program " advanced energy technology field intelligent grid key technology research and development (first phase) major project problem, has important researching value.
But the cost of energy-storage system is higher, technology is still not exclusively ripe, and capacity is compared and still had larger gap with conventional rack with electric weight, has hindered the application of energy-storage system in electric power system; Within predictable one period, energy-storage system and conventional rack cooperatively interact, and jointly provide the service of electric power system frequency modulation will become main flow.But the technical characterstic of conventional rack and energy-storage system has significant difference: but the conventional rack response speed is slow, the limited adjustable range of creep speed is large; Energy-storage system fast response time, the large still capacity of creep speed and electric weight are limited.Therefore, can not simply energy-storage system and conventional rack be made no exception, the existing AGC system by the energy-storage system to be directly brought into.The present invention proposes the control strategy that in a kind of AGC system, conventional rack coordinates with energy-storage system, make conventional rack and energy-storage system realize having complementary advantages, give full play to speciality separately, evade deficiency, complete better electric power system frequency modulation task.Just investigate the AGC control strategy of current domestic current, not yet have energy-storage system to coordinate the application of the control strategy that participates in frequency modulation with conventional rack at present.
Summary of the invention
The present invention one of is intended to solve the problems of the technologies described above at least to a certain extent or at least provides a kind of useful business to select.For this reason, the object of the invention is to propose a kind of conventional rack and energy-storage system characteristics separately of taking into full account, by the reasonable distribution regulating power, the two is maximized favourable factors and minimized unfavourable ones and realize complementary AGC control strategy.
Control strategy according in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system comprises the following steps: S1. obtains frequency departure and Tie line Power deviation, zoning control deviation from data acquisition and supervisor control; S2. according to described Region control deviation computing system regulatory demand power; S3. give described conventional rack by described system regulatory demand power division, calculate the target of described conventional rack and exert oneself; S4. calculate described conventional rack at current AGC the maximal regulated ability in the cycle; S5. bear the residual accommodation power division to described energy-storage system; And S6. checks and under send instructions, finish the current AGC cycle.
In one embodiment of the invention, described step S1 comprises: the note system AGC cycle is T, and the current period sequence number is k, and k is positive integer, when the cycle, k started, obtain system frequency deviation Δ f (k) and interregional Tie line Power deviation delta P from data acquisition and supervisor control tie(k), zoning control deviation ACE (k): ACE (k)=B Δ f (k)+Δ P tie(k), wherein B is the system frequency deviation coefficient, the MW/Hz of unit, Δ P tiedeviation for interconnection actual exchange power and scheduled net interchange.
In one embodiment of the invention, described step S2 comprises: according to described Region control deviation ACE (k), by the low-pass filtering mode, calculate described system regulatory demand power Δ P r:-Δ P r(k)=α ACE (k)+(1-α) ACE (k-1), wherein, α is filtering factor.
In one embodiment of the invention, described step S3 comprises: by system regulatory demand power Δ P rdistribute to described conventional rack available in system according to the capacity ratio, establishing conventional rack number of units available in cycle k is n, and the capacity of i platform unit is
Figure BDA00003552720400021
current exerting oneself as P gi(k), this unit by the regulating power amount be assigned with is
Figure BDA00003552720400022
target in current period is exerted oneself as P ' gi(k+1)=P gi(k)+Δ P ' gi(k).
In one embodiment of the invention, described step S4 comprises: due to the restriction of conventional rack climbing rate and response time, this target of described step S3 is exerted oneself and possibly can't be reached in current period, and the rise speed of note unit i is
Figure BDA00003552720400031
downward speed is
Figure BDA00003552720400032
the maximum output that when current period finishes, unit i can change is &Delta; P &OverBar; Gi ( k ) = min { &rho; Gi + T , &Delta; P Gi &prime; ( k ) } ( &Delta; P Gi &prime; ( k ) &GreaterEqual; 0 ) max { &rho; Gi - T , &Delta; P Gi &prime; ( k ) } ( &Delta; P Gi &prime; ( k ) < 0 ) .
In one embodiment of the invention, in described step S5: the computing formula of the residual accommodation power of being born by described energy-storage system is: P E ( k ) = &Delta; P R ( k ) - &Sigma; i = 1 n &Delta; P &OverBar; Gi ( k ) .
Contribute to suppress fast the fluctuation of frequency and the interregional Tie line Power of electric power system according to the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system, to electric power system safe, stable, economical operation is significant; Can reduce the frequency regulation capacity demand of electric power system, or in the situation that effect is controlled in the constant improvement of frequency regulation capacity.Its implementation is simple, almost do not increase operand, simultaneously low to the requirement of control system hardware environment, do not need existing AGC system is made to larger change, be specially adapted to contain the automatic electricity generation control system of conventional rack and two kinds of frequency modulation resources of energy-storage system simultaneously.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
The accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the schematic diagram of the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system;
Fig. 2 is the schematic flow sheet of the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system;
Fig. 3 is the effect schematic diagram of the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system.
Embodiment
Below describe embodiments of the invention in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label means same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
Fig. 1 is the schematic diagram of the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system.As shown in the figure, the fluctuation of load and intermittent regenerative resource will cause the variation of system frequency, data acquisition is controlled (Supervisory Control And Data Acquisition with supervision, SCADA) system is obtained the data such as system frequency and Tie line Power from electric power system, and offers the AGC system; AGC system-computed system regulatory demand amount (Area Regulation Requirement, ARR), and use the control strategy proposed in the present invention that it is assigned to conventional rack and energy-storage system, generate corresponding AGC instruction and issue; Conventional rack and energy-storage system are carried out the AGC instruction, to electric power system, inject regulating power, eliminate system frequency deviation.
The design philosophy of the control strategy that the present invention proposes is to allow as far as possible conventional rack bear the adjusting task, when maybe can't following the tracks of regulating power not in time, conventional rack response born by energy-storage system fast, make energy-storage system only put into operation rapidly when needed, thereby effectively realized coordinating between conventional rack and energy-storage system, avoided the shortcoming of energy storage system capacity and electric weight deficiency.This kind of control strategy makes the part nature that regulating power Wave amplitude is large, frequency is low be born by conventional rack, and the part that amplitude is little, frequency is high is born by energy-storage system, thereby has given full play to the advantage of two kinds of frequency modulation resources, has evaded shortcoming separately.Energy-storage system drops into rapidly when conventional rack is failed timely responsive control signal, in conventional rack, can during successful tracking control signal, exit in time, can effectively reduce the time of utilizing of energy-storage system, has effectively extended the useful life of energy-storage system.
As shown in Figure 2, the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system comprises the following steps:
S1. obtain frequency departure and Tie line Power deviation, zoning control deviation (Area Control Error, ACE) from data acquisition and supervisor control.
Particularly: the note system AGC cycle is T, and the current period sequence number is k, and k is positive integer, when the cycle, k started, obtains system frequency deviation Δ f (k) and interregional Tie line Power deviation delta P from data acquisition and supervisor control tie(k), zoning control deviation ACE (k): ACE (k)=B Δ f (k)+Δ P tie(k), wherein B is the system frequency deviation coefficient, the MW/Hz of unit, Δ P tiedeviation for interconnection actual exchange power and scheduled net interchange.
S2. according to Region control deviation computing system regulatory demand power.
Particularly, pass through low-pass filtering mode computing system regulatory demand power Δ P according to Region control deviation ACE (k) r:-Δ P r(k)=α ACE (k)+(1-α) ACE (k-1), wherein, α is filtering factor.
S3. by system regulatory demand power division to conventional rack, calculate the target of conventional rack and exert oneself.
Particularly: by system regulatory demand power Δ P rdistribute to conventional rack available in system according to the capacity ratio, establishing conventional rack number of units available in cycle k is n, and the capacity of i platform unit is
Figure BDA00003552720400041
current exerting oneself as P gi(k), this unit by the regulating power amount be assigned with is
Figure BDA00003552720400042
target in current period is exerted oneself as P ' gi(k+1)=P gi(k)+Δ P ' gi(k).
S4. calculate conventional rack at current AGC the maximal regulated ability in the cycle.
Particularly: due to the restriction of conventional rack climbing rate and response time, this target of step S3 is exerted oneself and possibly can't be reached in current period, and the rise speed of note unit i is
Figure BDA00003552720400051
downward speed is
Figure BDA00003552720400052
the maximum output that when current period finishes, unit i can change is &Delta; P &OverBar; Gi ( k ) = min { &rho; Gi + T , &Delta; P Gi &prime; ( k ) } ( &Delta; P Gi &prime; ( k ) &GreaterEqual; 0 ) max { &rho; Gi - T , &Delta; P Gi &prime; ( k ) } ( &Delta; P Gi &prime; ( k ) < 0 ) .
It is pointed out that
Figure BDA00003552720400054
it is the partially optimistic estimation that conventional rack is exerted oneself and changed; There are the many factors such as inertia, operating lag due to conventional rack, at the change Δ P that exerts oneself of an AGC actual generation in the cycle gi(k) may be less than this predicted value.
S5. the residual accommodation power division is born to energy-storage system.
If the expection conventional rack can digest regulating power fully within this cycle, energy-storage system is without action; If can not, by energy-storage system, bear remaining regulating power: P E ( k ) = &Delta; P R ( k ) - &Sigma; i = 1 n &Delta; P &OverBar; Gi ( k ) .
It should be noted that, if P ethe power limit that exceeds energy-storage system, the energy-storage system realistic objective is exerted oneself as its corresponding limit value.In addition, due to
Figure BDA00003552720400056
be partially optimistic estimation, the regulating power of the actual output of energy-storage system may be less than actual requirements, but this also can protect energy-storage system to be unlikely to too sensitive, in conventional rack, exerts oneself while with regulating power, very little difference being arranged and can not move.Exert oneself deviation while acquiring a certain degree when the actual and instruction of exerting oneself of conventional rack, and energy-storage system can change and exert oneself immediately, fills up the power adjustment that conventional rack can't complete.
S6. check and under send instructions, finish the current AGC cycle.
For making those skilled in the art understand better the present invention, Fig. 3 shows the effect of the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system.ACE obtains system regulating power Δ P after treatment r, the AGC system will be transferred intrasystem frequency modulation resource changing and exert oneself and follow Δ P rcurve.The strategy that this patent proposes by the regulating power priority allocation to conventional rack (Δ P g), not enough part is supplied (P by exerting oneself of energy-storage system e), thereby eliminate as well as possible frequency modulation unit power curve (Δ P g+ P e) and system regulating power curve (Δ P r) between deviation (Δ P).As seen from the figure, the energy storage resource drops into rapidly when conventional rack can't be followed the quick variation of regulating power curve, out of service when conventional rack can independently be born the frequency modulation task, thereby has realized the mutual supplement with each other's advantages between conventional rack and energy-storage system.
As from the foregoing, the control strategy that in AGC system of the present invention, conventional rack coordinates with energy-storage system, frequency departure and the Tie line Power deviation current according to electric power system are calculated Region control deviation ACE, wait after filtering after processing the regulatory demand amount ARR of the system that obtains; By the regulating power priority allocation to conventional rack, and calculate conventional rack at current AGC the maximal regulated ability in the cycle; Exert oneself if conventional rack can not reach target in the cycle at current AGC, remaining regulating power is distributed to energy-storage system and bear.
The control strategy that in AGC system of the present invention, conventional rack coordinates with energy-storage system contributes to suppress fast the fluctuation of frequency and the Tie line Power of electric power system, to electric power system safe, stable, economical operation is significant; Can reduce the frequency regulation capacity demand of electric power system, or in the situation that effect is controlled in the constant improvement of frequency regulation capacity; Its implementation is simple, almost do not increase operand, simultaneously low to the requirement of control system hardware environment, do not need existing AGC system is made to larger change, be specially adapted to contain the automatic electricity generation control system of conventional rack and two kinds of frequency modulation resources of energy-storage system simultaneously.
It should be noted that, in flow chart or any process of otherwise describing at this or method describe and can be understood to, mean to comprise one or more module for the code of the executable instruction of the step that realizes specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by the embodiments of the invention person of ordinary skill in the field.
In the description of this specification, the description of reference term " embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although the above has illustrated and has described embodiments of the invention, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art is not in the situation that break away from principle of the present invention and aim can be changed above-described embodiment within the scope of the invention, modification, replacement and modification.

Claims (6)

1. the control strategy that in an AGC system, conventional rack coordinates with energy-storage system, is characterized in that, comprises the following steps:
S1. obtain frequency departure and Tie line Power deviation, zoning control deviation from data acquisition and supervisor control;
S2. according to described Region control deviation computing system regulatory demand power;
S3. give described conventional rack by described system regulatory demand power division, calculate the target of described conventional rack and exert oneself;
S4. calculate described conventional rack at current AGC the maximal regulated ability in the cycle;
S5. bear the residual accommodation power division to described energy-storage system; And
S6. check and under send instructions, finish the current AGC cycle.
2. want as right the control strategy that in 1 described AGC system, conventional rack coordinates with energy-storage system, it is characterized in that, described step S1 comprises: the note system AGC cycle is T, the current period sequence number is k, k is positive integer, when the cycle, k started, obtain system frequency deviation Δ f (k) and interregional Tie line Power deviation delta P from data acquisition and supervisor control tie(k), zoning control deviation ACE (k): ACE (k)=B Δ f (k)+Δ P tie(k), wherein B is the system frequency deviation coefficient, the MW/Hz of unit, Δ P tiedeviation for interconnection actual exchange power and scheduled net interchange.
3. want as right the control strategy that in 2 described AGC systems, conventional rack coordinates with energy-storage system, it is characterized in that, described step S2 comprises: according to described Region control deviation ACE (k), by the low-pass filtering mode, calculate described system regulatory demand power Δ P r:-Δ P r(k)=α ACE (k)+(1-α) ACE (k-1), wherein, α is filtering factor.
4. want as right the control strategy that in 3 described AGC systems, conventional rack coordinates with energy-storage system, it is characterized in that, described step S3 comprises: by system regulatory demand power Δ P rdistribute to described conventional rack available in system according to the capacity ratio, establishing conventional rack number of units available in cycle k is n, and the capacity of i platform unit is
Figure FDA00003552720300011
current exerting oneself as P gi(k), this unit by the regulating power amount be assigned with is target in current period is exerted oneself as P ' gi(k+1)=P gi(k)+Δ P ' gi(k).
5. want as right the control strategy that in 4 described AGC systems, conventional rack coordinates with energy-storage system, it is characterized in that, described step S4 comprises: due to the restriction of conventional rack climbing rate and response time, this target of described step S3 is exerted oneself and possibly can't be reached in current period, and the rise speed of note unit i is
Figure FDA00003552720300013
downward speed is
Figure FDA00003552720300014
the maximum output that when current period finishes, unit i can change is &Delta; P &OverBar; Gi ( k ) = min { &rho; Gi + T , &Delta; P Gi &prime; ( k ) } ( &Delta; P Gi &prime; ( k ) &GreaterEqual; 0 ) max { &rho; Gi - T , &Delta; P Gi &prime; ( k ) } ( &Delta; P Gi &prime; ( k ) < 0 ) .
6. want as right the control strategy that in 5 described AGC systems, conventional rack coordinates with energy-storage system, it is characterized in that, in described step S5: the computing formula of the residual accommodation power of being born by described energy-storage system is: P E ( k ) = &Delta; P R ( k ) - &Sigma; i = 1 n &Delta; P &OverBar; Gi ( k ) .
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