CN103441534B - The control strategy that in AGC system, conventional rack coordinates with energy-storage system - Google Patents

Abstract

The invention discloses the control strategy that in a kind of AGC system, conventional rack coordinates with energy-storage system, comprise the following steps: from data acquisition with supervisor control, obtain frequency departure and Tie line Power deviation, zoning control deviation；System fading margin demand power is calculated according to district control deviation；System fading margin demand power is distributed to conventional rack, and the target calculating conventional rack is exerted oneself；Calculate conventional rack maximal regulated ability within the current AGC cycle；Residual accommodation power is distributed to energy-storage system undertake；And check and under send instructions, terminate the current AGC cycle.The present invention contributes to the fluctuation of frequency and the Tie line Power quickly suppressing power system；The frequency regulation capacity demand of power system can be reduced, or in the case of frequency regulation capacity is constant, improves frequency modulation control effect；Implementation method is simple, almost without increasing operand, requires low to control system hardware environment, it is not necessary to existing AGC system is made bigger change simultaneously.

Description

The control strategy that in AGC system, conventional rack coordinates with energy-storage system

Technical field

The invention belongs to power system Automatic Generation Control (Automatic Generation Control, AGC) field, A kind of control strategy that conventional rack coordinates with energy-storage system in AGC system.

Background technology

The frequency of power system is an important indicator of the quality of power supply, in order to safeguard the safe and stable operation of system, protects Protect power equipment, within system frequency needs to maintain metastable scope.The GB GB/T15945-2008 regulation of China, Within frequency departure allowed band is frequency rated value the 4 ‰ of large-scale power system.Frequency modulation is as a weight of power system The assistant service wanted, it is therefore an objective to transfer unit output and follow the short term variations of load in time, it is ensured that the frequency stable of system.

In recent years, increasingly sharpen in environmental pollution, greenhouse, under the overall background that fossil energy is day by day exhausted, wind-powered electricity generation, too The development of the new forms of energy such as sun energy is the swiftest and the most violent.But, wind energy and solar energy exert oneself there is intermittence, feature that change of exerting oneself is fast, Short-term forecast the most more difficulty is carried out to exerting oneself.For ensureing the safe operation of system, system needs more frequency regulation capacity (generally Thered is provided by conventional fossil fuel unit) so that the purchase cost of assistant service improves, the increased wear of frequency modulation unit；In part The area that wind-powered electricity generation penetrance is higher, it has to often carry out abandoning wind, cause the waste of clean energy resource.Additionally, with fired power generating unit Being main northern area, substantial amounts of thermal power plant unit needs electricity determining by heat, range of accommodation critical constraints in the winter time, causes system frequency modulation Capacity shortage, declines further the receiving ability of the intermittent renewable energy, causes huge economic loss, be unfavorable for country The realization of the target of energy-conserving and environment-protective and carbon emission reduction.

Compared with conventional rack, energy-storage system has that climbing rate is high, the advantage of fast response time, can quick system for tracking The fluctuation that load is exerted oneself with the intermittent renewable energy, these features make energy-storage system have natural property in frequency modulation is applied Energy advantage, has certain competitiveness in frequency modulation service market, and the frequency modulation brought that accesses on a large scale contributing to alleviating wind-powered electricity generation is stranded Difficulty, obtains more concern in recent years." energy-storage system improves fitful power access capability key technology research and opens Send out " it is put into country's " 863 Program " advanced energy technology field intelligent grid key technology research and development (phase) major project problem, There is important researching value.

But, energy-storage system relatively costly, technology is the most ripe, and capacity still has compared with conventional rack with electricity Bigger gap, hinders energy-storage system application in power system；Within predictable one period, energy-storage system with Conventional rack cooperates, and common offer power system frequency modulation service will become main flow.But, conventional rack and energy-storage system Technical characterstic has a significant difference: but conventional rack response speed is slow, the limited range of accommodation of creep speed is big；Energy-storage system rings Answer that speed is fast, creep speed big but capacity and electricity are limited.It is thus impossible to simply energy-storage system is regarded with conventional rack one Colleague, be directly brought into existing AGC system by energy-storage system.The present invention proposes conventional rack and energy storage in a kind of AGC system The control strategy that system coordinates so that conventional rack and energy-storage system realize having complementary advantages, and give full play to respective speciality, evade Deficiency, preferably completes power system frequency modulation task.From the point of view of just investigating the AGC control strategy of current domestic current, the most not yet Energy-storage system is had to coordinate the application of the control strategy participating in frequency modulation with conventional rack.

Summary of the invention

It is contemplated that solve one of above-mentioned technical problem the most to a certain extent or provide at a kind of useful business Industry selects.To this end, it is an object of the invention to propose one to take into full account conventional rack and the respective feature of energy-storage system, pass through Reasonable distribution regulation power makes the two maximize favourable factors and minimize unfavourable ones and realizes complementary AGC control strategy.

The control strategy that in AGC system according to embodiments of the present invention, conventional rack coordinates with energy-storage system, including following Step: S1. obtains frequency departure and Tie line Power deviation from data acquisition with supervisor control, and zoning is controlled Deviation processed；S2. system fading margin demand power is calculated according to described district control deviation；S3. by described system fading margin demand power Distributing to described conventional rack, the target calculating described conventional rack is exerted oneself；S4. described conventional rack is calculated in current AGC week Maximal regulated ability in phase；S5. residual accommodation power is distributed to described energy-storage system undertake；And S6. checks and issues Instruction, terminates the current AGC cycle.

In one embodiment of the invention, described step S1 includes: the note system AGC cycle is T, current period serial number K, k are positive integer, when the cycle, k started, obtain from data acquisition and supervisor control system frequency deviation Δ f (k) with Interregional Tie line Power deviation delta P_tie(k), zoning control deviation ACE (k): ACE (k)=B Δ f (k)+Δ P_tie K (), wherein B is system frequency deviation coefficient, unit MW/Hz, Δ P_tieFor interconnection actual exchange power and scheduled net interchange Deviation.

In one embodiment of the invention, described step S2 includes: pass through according to described district control deviation ACE (k) Low-pass filtering mode calculates described system fading margin demand power Δ P_R:-Δ P_R(k)=α ACE (k)+(1-α) ACE (k-1), its In, α is filtering factor.

In one embodiment of the invention, described step S3 includes: by system fading margin demand power Δ P_RAccording to capacity Pro rate is to described conventional rack available in system, if conventional rack number of units available in cycle k is n, i-th unit Capacity isCurrently exert oneself as P_GiK (), then allocated regulation quantity of power is by this unit Target in current period is exerted oneself as P '_Gi(k+1)=P_Gi(k)+ΔP′_Gi(k)。

In one embodiment of the invention, described step S4 includes: due to the restriction of conventional rack climbing rate Yu response time, This target of described step S3 is exerted oneself and possibly cannot be reached in current period, and the upper speed change rate of note unit i isLower speed change rate is The EIAJ that then at the end of current period, unit i can change is $\mathrm{\&Delta;}{\stackrel{\&OverBar;}{P}}_{\mathrm{Gi}}\left(k\right)=\left\{\begin{array}{cc}\min \{{\mathrm{\&rho;}}_{\mathrm{Gi}}^{+}T,\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)\}& (\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)\&GreaterEqual;0)\\ \max \{{\mathrm{\&rho;}}_{\mathrm{Gi}}^{-}T,\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)\}& (\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)<0)\end{array}\right..$

In one embodiment of the invention, in described step S5: the residual accommodation power undertaken by described energy-storage system Computing formula be: $P_E\left(k\right)=\mathrm{\&Delta;}{P}_R\left(k\right)-\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{\stackrel{\&OverBar;}{P}}_{\mathrm{Gi}}\left(k\right).$

The control strategy that in AGC system according to embodiments of the present invention, conventional rack coordinates with energy-storage system contributes to quickly The frequency of suppression power system and the fluctuation of interregional Tie line Power, safe and stable, the economical operation to power system Significant；The frequency regulation capacity demand of power system can be reduced, or in the case of frequency regulation capacity is constant, improves control Effect processed.Its implementation is simple, almost without increasing operand, requires low to control system hardware environment simultaneously, it is not necessary to Existing AGC system is made bigger change, is particularly well-suited to contain conventional rack and two kinds of frequency modulation resources of energy-storage system simultaneously Automatic electricity generation control system.

The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description Obtain substantially, or recognized by the practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment and will become Substantially with easy to understand, wherein:

Fig. 1 be the embodiment of the present invention AGC system in the schematic diagram of control strategy that coordinates with energy-storage system of conventional rack；

Fig. 2 be the embodiment of the present invention AGC system in the flow process of control strategy that coordinates with energy-storage system of conventional rack show It is intended to；

Fig. 3 be the embodiment of the present invention AGC system in the effect of control strategy that coordinates with energy-storage system of conventional rack show It is intended to.

Detailed description of the invention

Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.

Fig. 1 be the embodiment of the present invention AGC system in the schematic diagram of control strategy that coordinates with energy-storage system of conventional rack. As it can be seen, the fluctuation of load and the intermittent renewable energy will cause the change of system frequency, data acquisition to control with monitoring (Supervisory Control And Data Acquisition, SCADA) system obtains system frequency from power system And the data such as Tie line Power, and it is supplied to AGC system；AGC system calculates system fading margin demand (Area Regulation Requirement, ARR), and use in the present invention propose control strategy assign it to conventional rack and Energy-storage system, generates corresponding AGC and instructs and issue；Conventional rack and energy-storage system perform AGC instruction, inject to power system Regulation power, eliminates system frequency deviation.

The design philosophy of the control strategy that the present invention proposes is to allow conventional rack undertake regulation task as far as possible, works as tradition Unit response is undertaken by quick energy-storage system when the most maybe cannot follow the tracks of regulation power so that energy-storage system is the most when needed Put into operation rapidly, thus have effectively achieved coordinating between conventional rack with energy-storage system, avoided energy storage system capacity The shortcoming not enough with electricity.This kind of control strategy makes the part that in regulation power, fluctuating margin is big, frequency is low natural by tradition Unit undertakes, and the part that amplitude is little, frequency is high is undertaken by energy-storage system, thus has given full play to the advantage of two kinds of frequency modulation resources, Evade respective shortcoming.Energy-storage system puts into rapidly when conventional rack fails to timely respond to control signal, in conventional rack Exiting in time when can successfully track control signal, that can effectively reduce energy-storage system utilizes the time, effectively extends storage The service life of energy system.

As in figure 2 it is shown, the control strategy that in the AGC system of the embodiment of the present invention, conventional rack coordinates with energy-storage system includes Following steps:

S1. from data acquisition with supervisor control, obtain frequency departure and Tie line Power deviation, calculate district Territory control deviation (Area Control Error, ACE).

Specifically: the note system AGC cycle is T, and current period serial number k, k is positive integer, when the cycle, k started, from number System frequency deviation Δ f (k) and interregional Tie line Power deviation delta P is obtained in supervisor control according to gathering_tie (k), zoning control deviation ACE (k): ACE (k)=B Δ f (k)+Δ P_tieK (), wherein B is system frequency deviation coefficient, single Position MW/Hz, Δ P_tieDeviation for interconnection actual exchange power Yu scheduled net interchange.

S2. system fading margin demand power is calculated according to district control deviation.

Specifically, system fading margin demand power Δ is calculated according to district control deviation ACE (k) by low-pass filtering mode P_R:-Δ P_RK ()=α ACE (k)+(1-α) ACE (k-1), wherein, α is filtering factor.

S3., system fading margin demand power is distributed to conventional rack, and the target calculating conventional rack is exerted oneself.

Specifically: by system fading margin demand power Δ P_RConventional rack available in distributing to system according to capacity ratio, If conventional rack number of units available in cycle k is n, the capacity of i-th unit isCurrently exert oneself as P_Gi(k), then this unit By allocated regulation quantity of power it isTarget in current period is exerted oneself as P '_Gi(k+1)= P_Gi(k)+ΔP′_Gi(k)。

S4. conventional rack maximal regulated ability within the current AGC cycle is calculated.

Specifically: due to the restriction of conventional rack climbing rate Yu response time, exert oneself possibly cannot be for this target of step S3 Reaching in current period, the upper speed change rate of note unit i isLower speed change rate isThen at the end of current period, unit i is permissible The EIAJ changed is $\mathrm{\&Delta;}{\stackrel{\&OverBar;}{P}}_{\mathrm{Gi}}\left(k\right)=\left\{\begin{array}{cc}\min \{{\mathrm{\&rho;}}_{\mathrm{Gi}}^{+}T,\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)\}& (\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)\&GreaterEqual;0)\\ \max \{{\mathrm{\&rho;}}_{\mathrm{Gi}}^{-}T,\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)\}& (\mathrm{\&Delta;}{P}_{\mathrm{Gi}}^{\&prime;}\left(k\right)<0)\end{array}\right..$

It is pointed out thatIt it is the partially optimistic estimation of changed that conventional rack is exerted oneself；Due to tradition machine There is the many factors such as inertia, operating lag in group, the change Δ P that exerts oneself actually occurred within an AGC cycle_GiK () may be little In this predictive value.

S5. residual accommodation power is distributed to energy-storage system undertake.

If it is expected that conventional rack can regulate power with catapepsis within this cycle, then energy-storage system is without action；As Fruit can not, then undertaken remaining regulation power by energy-storage system: $P_E\left(k\right)=\mathrm{\&Delta;}{P}_R\left(k\right)-\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{\stackrel{\&OverBar;}{P}}_{\mathrm{Gi}}\left(k\right).$

If it should be noted that P_EBeyond the power limit of energy-storage system, then energy-storage system realistic objective is exerted oneself as it Corresponding limit value.Further, sinceBeing partially optimistic estimation, the regulation power of the actual output of energy-storage system may be less than Actual requirements, but this can also protect energy-storage system to be unlikely to the sensitiveest, exerts oneself in conventional rack and regulates power and have Will not action during the least difference.When conventional rack actual exert oneself and instruct output deviation reach to a certain degree time, energy storage system System can change immediately exerts oneself, and fills up the power adjustment that conventional rack cannot complete.

S6. check and under send instructions, terminate the current AGC cycle.

In order to make those skilled in the art be more fully understood that, the present invention, Fig. 3 show in the AGC system of the embodiment of the present invention passes The effect of the control strategy that system unit coordinates with energy-storage system.ACE obtains system fading margin power Δ P after treatment_R, AGC system Intrasystem for transfer frequency modulation resource changing is exerted oneself and follows Δ P_RCurve.Regulation power is preferentially distributed by the strategy that this patent proposes To conventional rack (Δ P_G), not enough part is supplied (P by exerting oneself of energy-storage system_E), thus eliminate frequency modulation unit as well as possible Power curve (Δ P_G+P_E) and system fading margin power curve (Δ P_RDeviation (Δ P) between).As seen from the figure, energy storage resource is passing System unit puts into rapidly when cannot follow the Rapid Variable Design of regulation power curve, can independently undertake frequency modulation task in conventional rack Time out of service, it is achieved thereby that the mutual supplement with each other's advantages between conventional rack and energy-storage system.

From the foregoing, it will be observed that the control strategy that in the AGC system of the present invention, conventional rack coordinates with energy-storage system, according to power train Current frequency departure and the Tie line Power deviation of uniting calculates district control deviation ACE, obtains after waiting process after filtering Regulatory demand amount ARR of system；Regulation power is preferentially distributed to conventional rack, and calculates conventional rack in the current AGC cycle Interior maximal regulated ability；Exert oneself if conventional rack can not reach target within the current AGC cycle, then by remaining regulation merit Rate is distributed to energy-storage system and is undertaken.

The control strategy that in the AGC system of the present invention, conventional rack coordinates with energy-storage system contributes to quickly suppressing power train The fluctuation of frequency and the Tie line Power of system, to power system safe and stable, economical operation is significant；Can To reduce the frequency regulation capacity demand of power system, or in the case of frequency regulation capacity is constant, improve control effect；Its realization side Method is simple, almost without increasing operand, requires low to control system hardware environment, it is not necessary to existing AGC system simultaneously Make bigger change, be particularly well-suited to the Automatic Generation Control simultaneously containing conventional rack with two kinds of frequency modulation resources of energy-storage system System.

It should be noted that any process described otherwise above or method describe and can be managed in flow chart or at this Xie Wei, represents and includes one or more code for the executable instruction of the step that realizes specific logical function or process Module, fragment or part, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not be by shown The order gone out or discuss, including according to involved function by basic mode simultaneously or in the opposite order, performs function, This should be understood by embodiments of the invention person of ordinary skill in the field.

In the description of this specification, reference term " embodiment ", " example ", " concrete example " or " some show Example " etc. description means to combine this embodiment or example describes specific features, structure, material or feature be contained in the present invention At least one embodiment or example in.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical Embodiment or example.And, the specific features of description, structure, material or feature can be in any one or more realities Execute in example or example and combine in an appropriate manner.

Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example Property, it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art is without departing from the principle of the present invention and objective In the case of above-described embodiment can be changed within the scope of the invention, revise, replace and modification.

Claims (1)

1. the control strategy that in an AGC system, conventional rack coordinates with energy-storage system, it is characterised in that comprise the following steps:

S1. obtaining frequency departure and Tie line Power deviation from data acquisition with supervisor control, zoning is controlled Deviation processed, note the system AGC cycle be T, current period serial number k, k is positive integer, when the cycle, k started, from data acquisition with Supervisor control obtains system frequency deviation Δ f (k) and interregional Tie line Power deviation delta P_tieK (), calculates district Territory control deviation ACE (k): ACE (k)=B Δ f (k)+Δ P_tie(k), wherein B is system frequency deviation coefficient, unit MW/Hz, ΔP_tieDeviation for interconnection actual exchange power Yu scheduled net interchange；

S2. calculate system fading margin demand power according to described district control deviation, lead to according to described district control deviation ACE (k) Cross low-pass filtering mode and calculate described system fading margin demand power Δ P_R(k) :-Δ P_R(k)=α ACE (k)+(1-α) ACE (k-1), wherein, α is filtering factor；

S3. described system fading margin demand power being distributed to described conventional rack, the target calculating described conventional rack is exerted oneself, will System fading margin demand power Δ P_RK described conventional rack that () is available in distributing to system according to capacity ratio, if can in cycle k Conventional rack number of units be n, the capacity of i-th unit isCurrently exert oneself as P_GiK (), then this unit is by allocated tune Joint quantity of power isTarget in current period is exerted oneself as P '_Gi(k)=P_Gi(k)+ΔP_Gi(k)；

S4. described conventional rack maximal regulated ability within the current AGC cycle is calculated, due to conventional rack climbing rate and response The restriction of time, this target of described step S3 is exerted oneself and possibly cannot be reached in current period, remembers that the upper speed change rate of unit i isLower speed change rate isThe EIAJ that then at the end of current period, unit i can change is $\mathrm{\&Delta;}{\stackrel{\&OverBar;}{P}}_{Gi}\left(k\right)=\left\{\begin{array}{cc}\min \left\{{\mathrm{\&rho;}}_{Gi}^{+}T,{\mathrm{\&Delta;P}}_{Gi}\left(k\right)\right\}& \left({\mathrm{\&Delta;P}}_{Gi}\left(k\right)\&GreaterEqual;0\right)\\ \max \left\{{\mathrm{\&rho;}}_{Gi}^{-}T,{\mathrm{\&Delta;P}}_{Gi}\left(k\right)\right\}& \left({\mathrm{\&Delta;P}}_{Gi}\left(k\right)<0\right)\end{array}\right.;$

S5. residual accommodation power is distributed to described energy-storage system undertake, described energy-storage system the residual accommodation power undertaken Computing formula be:And

S6. check and under send instructions, terminate the current AGC cycle.