CN104319783A - System and method for two-level distribution network coordination control based on load forecasting - Google Patents
System and method for two-level distribution network coordination control based on load forecasting Download PDFInfo
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- CN104319783A CN104319783A CN201410498352.4A CN201410498352A CN104319783A CN 104319783 A CN104319783 A CN 104319783A CN 201410498352 A CN201410498352 A CN 201410498352A CN 104319783 A CN104319783 A CN 104319783A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a system and a method for two-level distribution network coordination control based on load forecasting. The system comprises gateways, a first-level control module and a second-level control module. The design core of the method of the invention is as follows: a medium and low-voltage distribution network proposes a reactive power regulation range constraint to a high-voltage distribution network, the high-voltage distribution network proposes a voltage regulation range constraint to the medium and low-voltage distribution network, and both networks consider the constraints proposed by each other in optimization calculation, which not only embodies the voltage regulation capability of the high-voltage distribution network to the medium and low-voltage distribution network, but also embodies the reactive power compensation capability of the medium and low-voltage distribution network to the high-voltage distribution network. By adopting the system and the method of the invention, coordinated optimization control on the high-voltage distribution network and the medium and low-voltage distribution network is realized, and overall optimal voltage and reactive power control in the global range is realized, thereby reducing the network loss effectively and improving the voltage level of the distribution networks.
Description
Technical field
The present invention relates to voltage & var control technical field, more specifically relate to a kind of power distribution network secondary coordinated control system based on load prediction and method.
Background technology
Voltage & var control is after the active power dispatch of electrical network completes, and controls, thus make the running status of electrical network trend towards optimum to the voltage of Capacitor banks, load tap changer, distributed power source and idle to exert oneself etc.The optimal control of voltage power-less, not only can improve the quality of power supply and voltage stability margin, can also effectively reduce via net loss.
The electric pressure that power distribution network relates to is more, comprises 110kV, 35kV, 10kV, 0.4kV etc.; Circuit radially distributes, the many and dispersion of interstitial content, and voltage power-less conditioning equipment quantity is large and be distributed in different electric pressures; Communication channel is weak, and the control objectives of the superior and the subordinate's control system is inconsistent, and control information is difficult to share; The access of distributed power source makes the operation and control of power distribution network more complicated.
At present, mostly the control mode of power distribution network is to adopt centralized control or distributed AC servo system.Centralized control is on the basis of dispatch automated system, gathers the data of the whole network, carries out overall optimization calculate, by the execution of the direct control voltage reactive apparatus of communication port by main website automatic voltage control system AVC to the whole network.Distributed AC servo system is that power distribution network is divided into multiple subnet, in SCADA (Supervisory Control And Data Acquisition) system, on the basis of i.e. data acquisition and supervisor control, each subnet is optimized calculating respectively, thus controls the voltage power-less device action in subnet.But the two has certain defect, centralized control requires higher to communication level and computing capability, and requires that there is the related data of the whole network in control centre, and calculating solves very complicated when system scale is very large; And distributed AC servo system more considers the optimal control in each subnet region, the coordination between each region and the overall more difficult realization of optimum.Particularly after a large amount of distributed power sources access power distribution network, voltage power-less conditioning equipment quantity sharply increases, and considers the uncertainty of distributed power source, controls more complicated, propose stern challenge to the voltage & var control mode of existing power distribution network.
Power distribution network can be divided into high voltage distribution network and low and medium voltage distribution network according to electric pressure.At present, most control methods and the research of strategy are only for substation level and above power distribution network, little to the research of 10kV and such as the following level power distribution network.And along with increasing distributed power source access medium voltage distribution network (10kV), power distribution network there has also been very strong voltage power-less regulation and control ability, must consider the voltage & var control of low and medium voltage distribution network.Due to low and medium voltage distribution network line node Numerous, can not detailed modeling be carried out in high voltage distribution network side, the duty value such as normally at step-down substation place, the low and medium voltage distribution network connect under transformer station is equivalent to, ignore the topological structure that it is concrete; In like manner, in the model of low and medium voltage distribution network, usually high voltage distribution network is equivalent to equivalent power supply.Like this, model information imperfection, brings certain difficulty to the cooperation control of high voltage distribution network and low and medium voltage distribution network.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention how to realize the whole network voltage, reactive power globalize Optimal Distribution and control.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of power distribution network secondary coordinated control system based on load prediction, described system comprises critical point, one-level control module, Two-stage control module;
Described critical point is arranged at the on high-tension side bus place of transformer or the bus place of low-pressure side that connect high voltage distribution network and low and medium voltage distribution network; For obtaining the maximum compensation ability of total active power at critical point place, total reactive power, reactive apparatus according to load prediction;
Described one-level control module calculates the upper and lower limit of the reactive power regulating power at critical point described in each according to the maximum compensation ability of described total reactive power, reactive apparatus, send it to Two-stage control module together with described total active power at corresponding critical point;
Described Two-stage control module, according to the upper and lower limit of described reactive power regulating power and described total active power, calculates voltage optimized scope and the power factor optimized scope at corresponding critical point, and is handed down to the described critical point of described one-level control module and correspondence;
Described one-level control module issue according to described Two-stage control module each described in the described voltage optimized scope at critical point and described power factor optimized scope, to exert oneself etc. as control variables is optimized calculating with the voltage power-less of the voltage & var control equipment of the mid & low-voltage line of the magnitude of voltage at described critical point and correspondence, draw the optimal voltage value at critical point described in each, in mid & low-voltage line corresponding to optimal power factor and described critical point, the optimal voltage of each control appliance is idle exerts oneself, and the optimal voltage value at critical point described in each and optimal power factor are returned to corresponding critical point,
Described critical point judges described optimal voltage value, optimal power factor whether respectively in described voltage optimized scope and power factor optimized scope, if, by described one-level control module according to the idle voltage power-less device action controlled by communicator in mesolow distribution line of exerting oneself of described optimal voltage; Otherwise revise described voltage optimized scope or power factor optimized scope by described Two-stage control module, and be again handed down to described one-level control module.
Preferably, the corresponding transformer in critical point described in each, described one-level control module arranges the operating state at corresponding described critical point according to the running status of transformer, is specially:
When described transformer is one, the critical point of its correspondence normally works;
Described transformer is multiple stage and split operation, and the critical point that each described transformer is corresponding all normally works;
Described transformer be multiple stage and paired running time, the critical point that wherein described transformer is corresponding normally works, and the critical point that transformer described in all the other is corresponding is closed.
Preferably, described critical point also comprises measuring component, is arranged at the bus place of described step down side, for monitoring voltage and power.
Preferably, described measuring component comprises voltage transformer summation current transformer.
The invention also discloses a kind of power distribution network secondary control method for coordinating based on load prediction, said method comprising the steps of:
S1, setup control cycle;
S2, each critical point operating state is set;
S3, described control cycle start, and one-level control module calculates the upper and lower limit of the reactive power regulating power at critical point described in each;
S4, described one-level control module send total active power corresponding to the upper and lower limit of the described reactive power regulating power at each critical point and each critical point of obtaining according to load prediction to Two-stage control module;
S5, described Two-stage control module, the duty value such as the one-level control module of each critical point described and correspondence to be equivalent to respectively, upper with the reactive power regulating power at corresponding critical point place, lower limit is as constraint, be that active power is known by the line equivalent of the low and medium voltage distribution network of critical point described in each and correspondence thereof, and reactive power adjustable load within the specific limits, be specially total active power corresponding for critical point described in each as the active power waiting duty value, upper by the reactive power regulating power at critical point described in each, lower limit carries out overall optimization calculating as the adjustable extent of equivalent reactive load power, obtain the node voltage optimal value and the power factor optimal value that wait duty value that critical point described in each is corresponding,
S6, described Two-stage control module calculate voltage optimized scope and power factor optimized scope according to described voltage optimal value and power factor optimal value, and send it to corresponding described critical point and described one-level control module respectively by communication system;
S7, described one-level control module are according to described voltage optimized scope corresponding to each critical point and power factor optimized scope, with the voltage power-less of the voltage & var control equipment of the mesolow link of the magnitude of voltage at described critical point and correspondence to exert oneself etc. for control variables be optimized calculate each critical point place optimal voltage value, the optimal voltage of each control appliance is idle in mid & low-voltage line corresponding to optimal power factor and described critical point exerts oneself, and described optimal voltage value and optimal power factor is sent to corresponding described critical point;
Whether S8, described critical point judge respectively to described optimal voltage value and optimal power factor in described voltage optimized scope and power factor optimized scope, if, then by described one-level control module, idle for described optimal voltage exerting oneself is handed down to the voltage power-less equipment in mesolow distribution line by communication system and is controlled its action; Otherwise adjust described voltage optimized scope or power factor optimized scope, and return step S3.
Preferably, when described step S3 starts, first obtained the maximum compensation ability of total active power corresponding to critical point described in each, total reactive power, reactive apparatus by load prediction by described critical point.
Preferably, after described step S3 obtains the maximum compensation ability of described total active power, total reactive power, reactive apparatus, obtained the maximum compensation ability of total reactive power, reactive apparatus by described one-level control module according to critical point described in each, calculate the upper and lower limit of the reactive power regulating power at critical point described in each: Q
i min=Q
i, Q
i max=Q
i+ Q
ci; Wherein Q
i minbe the lower limit of the reactive power regulating power at i-th critical point, Q
i maxbe the upper limit of the reactive power regulating power at i-th critical point, Q
ibe total reactive power at i-th critical point, Q
ciit is the maximum compensation ability of the reactive apparatus at i-th critical point.
Preferably, in described step S5 with the loss minimization of high voltage distribution network corresponding to critical point described in each for target, in described high voltage distribution network, the voltage regulation capability of voltage power-less equipment, reactive power regulating power are optimized calculating as constraint.
Preferably, in described step S6, voltage optimized scope deterministic process is specially: the corresponding critical point described in each of described Two-stage control module provides a voltage deviation respectively, obtains the voltage optimized scope (V that critical point described in each is corresponding
i opt-Δ V
i, V
i opt+ Δ V
i), wherein V
i optbe described voltage optimal value corresponding to i-th critical point, Δ V
ibe described voltage deviation corresponding to i-th critical point, the node voltage of duty value that waits allowing critical point described in each corresponding regulates in described voltage optimized scope;
In described step S6, optimal power factor optimized scope deterministic process is specially: the corresponding critical point described in each of described Two-stage control module provides a power factor side-play amount respectively, obtains the power factor optimized scope that critical point described in each is corresponding
wherein
be described power factor optimal value corresponding to i-th critical point,
be described power factor side-play amount corresponding to i-th critical point, the reactive power of duty value that waits allowing critical point described in each corresponding regulates in described power factor optimized scope.
Preferably, in described step S7 with the loss minimization of low and medium voltage distribution network corresponding to each critical point for target, with the voltage regulation limits of the voltage power-less equipment in the low and medium voltage distribution network that critical point described in each is corresponding, reactive power adjustable range, voltage regulation limits, the reactive power adjustable range of distributed power generation unit (Distributed Generation), the voltage bound at critical point place, as constraint, is exerted oneself as control variables is optimized calculating with the voltage power-less of the voltage & var control equipment of the mid & low-voltage line of the voltage at described critical point and correspondence.
(3) beneficial effect
The invention provides a kind of power distribution network secondary coordinated control system based on load prediction and method, system of the present invention and method achieve the cooperation control between high voltage distribution network and low and medium voltage distribution network, overall voltage and reactive power optimal control is realized in network-wide basis, thus effectively reduce via net loss, improve the voltage levvl of power distribution network.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of power distribution network secondary control method for coordinating flow chart based on load prediction of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
The invention discloses a kind of power distribution network secondary coordinated control system based on load prediction, described system comprises: critical point, one-level control module and Two-stage control module.
Critical point, for obtaining the maximum compensation ability of total active power at each critical point place, total reactive power, reactive apparatus according to load prediction; Be arranged at the on high-tension side bus place of transformer or the bus place of low-pressure side that connect high voltage distribution network and low and medium voltage distribution network, transformer correspondence described in every platform arranges a critical point.The optimal voltage value that described critical point issues according to one-level control module and optimal power factor control the transformer work of its correspondence.
One-level control module, comprise the voltage power-less equipment such as distributed power source, capacitor of circuit in mesolow distribution corresponding to each critical point and connection thereof, also comprise a controller, control the voltage power-less device action in mesolow distribution line by communication system.Described one-level control module calculates the upper and lower limit of the reactive power regulating power at critical point described in each according to the maximum compensation ability of described total reactive power, reactive apparatus, and by its total active-power P with corresponding critical point
isend Two-stage control module together to;
Two-stage control module, according to upper and lower limit and described total active power of described reactive power regulating power, calculates voltage optimized scope and the power factor optimized scope at corresponding critical point, and is handed down to the described critical point of described one-level control module and correspondence.Described Two-stage control module, as control centre, has two-way data-transformation facility, both can send instruction to one-level control module, and can receive again the return data of one-level control module.
Described one-level control module issue according to described Two-stage control module each described in the voltage optimized scope at critical point and described power factor optimized scope, the voltage power-less of the voltage & var control equipment of the mid & low-voltage line connected with the magnitude of voltage at described critical point and corresponding critical point to be exerted oneself etc. as control variables, calculate that the optimal voltage of each control appliance in mid & low-voltage line corresponding to the optimal voltage value at critical point described in each, optimal power factor and described critical point is idle exerts oneself, and described optimal voltage value and optimal power factor are returned to corresponding described critical point.
Described critical point judges described optimal voltage value, optimal power factor whether respectively in described voltage optimized scope and power factor optimized scope, if, by described one-level control module according to the idle voltage power-less device action controlled by communicator in mesolow distribution line of exerting oneself of described optimal voltage; Otherwise revise described voltage optimized scope or power factor optimized scope by described Two-stage control module, and be again handed down to described one-level control module.
Critical point described in each is the interface of one-level control module, Two-stage control module, and the data interaction of one-level control module, Two-stage control module is generally carried out around the voltage at critical point place and reactive power.
The operating state at described critical point is controlled by one-level control module, and when described transformer is one, the critical point that described transformer is corresponding normally works; Described transformer is multiple stage and split operation, and the critical point that each described transformer is corresponding all normally works; Described transformer be multiple stage and paired running time, the critical point that wherein described transformer is corresponding normally works, and the critical point that transformer described in all the other is corresponding is closed.
The critical point of described a kind of power distribution network secondary coordinated control system based on load prediction also comprises measuring component, is preferably arranged at the bus place of described step down side, for monitoring voltage and power.Described measuring component comprises voltage transformer, current transformer and other measuring component, low and medium voltage distribution network circuit head end voltage corresponding to critical point and power factor not only can be monitored by these measuring components, can also monitor voltage and the reactive power compensation situation of high voltage distribution network line end corresponding to critical point, wherein said power factor calculates according to active power and reactive power and draws.
The invention also discloses a kind of power distribution network secondary control method for coordinating based on load prediction, said method comprising the steps of, as shown in Figure 1:
S1, setup control cycle; This control cycle is equal with the cycle of short-term or ultra-short term data, manually can set according to actual conditions and demand;
S2, each critical point operating state is set;
S3, described control cycle start, and one-level control module obtains the maximum compensation ability of total reactive power, reactive apparatus according to critical point described in each, calculate the upper and lower limit of the reactive power regulating power at critical point described in each: Q
i min=Q
i, Q
i max=Q
i+ Q
ci; Wherein Q
i minbe the lower limit of the reactive power regulating power at i-th critical point, Q
i maxbe the upper limit of the reactive power regulating power at i-th critical point, Q
ibe total reactive power at i-th critical point, Q
ciit is the maximum compensation ability of the reactive apparatus at i-th critical point;
S4, described one-level control module send total active power corresponding to the upper and lower limit of the described reactive power regulating power at each critical point and each critical point to Two-stage control module;
S5, when voltage meets the voltage levvl that system specifies, Two-stage control module with the loss minimization of high voltage distribution network corresponding to critical point described in each for target, with the voltage regulation capability of voltage power-less equipment in described high voltage distribution network, reactive power regulating power, the reactive power regulating power at corresponding critical point place upper, lower limit is as constraint, be the adjustable load of reactive power by the line equivalent of the low and medium voltage distribution network of critical point described in each and correspondence thereof, using total active power corresponding for critical point described in each as the active power waiting duty value, upper by the reactive power regulating power at critical point described in each, lower limit is as the adjustable extent of equivalent reactive load power, the optimization carrying out the overall situation calculates, obtain the node voltage optimal value and the power factor optimal value that wait duty value that critical point described in each is corresponding, the following formula of Optimized model.
minf
S(x
S,u
S)
Above in formula, target function f
sfor via net loss, u
sfor control variables, comprise the voltage magnitude etc. of the reactive power at critical point, the reactive power (distributed power generation unit Distributed Generation) of adjustable DG, balance node and PV node; x
sfor state variable, comprise the power etc. of the voltage of PQ node and power, PV node; Equality constraint comprises trend constraint etc., and inequality constraints comprises the range constraint etc. of control variables and state variable, will consider the reactive power regulating power at corresponding critical point place in constraints especially; In above formula, subscript S represents Two-stage control module (Secondary System);
The voltage regulation capability of S6, the uncertainty considering load prediction and each critical point place transformer, the corresponding critical point described in each of described Two-stage control module provides a voltage deviation respectively, obtains the voltage optimized scope (V that critical point described in each is corresponding
i opt-Δ V
i, V
i opt+ Δ V
i), wherein V
i optbe described voltage optimal value corresponding to i-th critical point, Δ V
ibe described voltage deviation corresponding to i-th critical point, the node voltage of duty value that waits allowing critical point described in each corresponding regulates in described voltage optimized scope;
Optimal power factor optimized scope deterministic process is specially: the corresponding critical point described in each of described Two-stage control module provides a power factor side-play amount respectively, obtains the power factor optimized scope that critical point described in each is corresponding
wherein
be described power factor optimal value corresponding to i-th critical point,
be described power factor side-play amount corresponding to i-th critical point, the reactive power of duty value that waits allowing critical point described in each corresponding regulates in described power factor optimized scope; Described voltage optimized scope and power factor optimized scope are sent to corresponding described critical point and described one-level control module by described Two-stage control module respectively;
S7, when voltage meets the voltage levvl that system specifies, described one-level control module is according to voltage optimized scope corresponding to each critical point and power factor optimized scope, with the loss minimization of low and medium voltage distribution network corresponding to each critical point for target, with the voltage regulation limits of the voltage power-less equipment in the low and medium voltage distribution network that critical point described in each is corresponding, reactive power adjustable range, the voltage regulation limits of adjustable DG, reactive power adjustable range, on the voltage at critical point place, lower limit, capacitor group switching capacity is as constraint, to exert oneself etc. as control variables is optimized calculating with the voltage power-less of the voltage & var control equipment of link under the voltage at described critical point and corresponding critical point, be optimized calculating, draw optimal voltage value and the optimal power factor value at each critical point place, the following formula of Optimized model
minf
P(x
P,u
P)
In above formula, target function f
pfor loss minimization, u
pfor control variables, x
pfor state variable, equality constraint comprises trend constraint etc., and inequality constraints comprises control variables u
pwith state variable x
prange constraint etc., the voltage optimized scope at corresponding critical point place and the power factor optimized scope at critical point place will be considered especially in constraints, in above formula, subscript P represents one-level control module (Primary System), described optimal voltage value and optimal power factor is sent to corresponding described critical point;
Whether S8, described critical point judge respectively to described optimal voltage value and optimal power factor in described voltage optimized scope and power factor optimized scope, if, then the cooperation control of this control cycle completes, and by described one-level control module, idle for described optimal voltage exerting oneself is handed down to the voltage power-less equipment in mesolow distribution line by communication system and is controlled its action; Otherwise adjust described voltage optimized scope by adjustment voltage deviation or adjust described power factor optimized scope by Modulating Power factor offset amount, re-issue to described and control module, and return step S3.
When described step S3 starts, first obtained the maximum compensation ability of total active power corresponding to critical point described in each, total reactive power, reactive apparatus by load prediction by described critical point.
New control cycle arrives, and performs from described step S3.
System and method of the present invention achieves the cooperation control between high voltage distribution network and low and medium voltage distribution network, low and medium voltage distribution network proposes the constraint of reactive power adjustable range to high voltage distribution network, high voltage distribution network proposes voltage regulation limits constraint to low and medium voltage distribution network simultaneously, both sides consider the constraint that the other side proposes when self being optimized calculating, both embody the regulating and controlling voltage ability of high voltage distribution network to low and medium voltage distribution network, embody again the reactive power compensation planning of low and medium voltage distribution network to high voltage distribution network.By system and method for the present invention, the coordination optimization realizing high voltage distribution network and low and medium voltage distribution network controls, and realizes overall voltage, reactive power optimized control, thus effectively reduce via net loss in global scope, improves the voltage levvl of power distribution network.
An embodiment of method of the present invention:
The present embodiment considers a high voltage distribution network H and three the coordination voltage control between medium voltage distribution network M1, M2, M3, wherein high voltage distribution network H is as higher level's electrical network, control 66kV electric pressure electrical network and the wind energy turbine set be connected with 66kV electrical network by step-up transformer and a thermal power plant, the electrical network of medium voltage distribution network control 10kV electric pressure, high voltage distribution network is connected with the transformer of medium voltage distribution network by 66/10kV, wherein, three medium voltage distribution networks M1, M2, M3 are connected with high voltage distribution network H respectively by transformer T1, T2, T3.High voltage distribution network H is controlled by Two-stage control module (Secondary System) SS, and three medium voltage distribution networks M1, M2, M3 are controlled by one-level control module (Primary System) PS1, PS2, PS3 respectively.
Concrete rate-determining steps is as follows:
1) be 5 minutes according to predetermined period of ultra-short term data, the setup control cycle is 5 minutes;
2) set up critical point respectively, called after G1, G2, G3 in the low-pressure side of transformer T1, T2, T3 of connecting high voltage distribution network and medium voltage distribution network, three critical points are connected respectively high voltage distribution network H and three medium voltage distribution network M1, M2, M3;
3) when control cycle arrives, one-level control module PS1, PS2, PS3 obtain total active-power P of corresponding critical point G1, G2, G3 according to load prediction data
1, P
2, P
3with total reactive power Q
1, Q
2, Q
3, and the maximum compensation ability Q of the reactive apparatus at each critical point place
c1, Q
c2, Q
c3, calculate the bound of the reactive power regulating power at corresponding critical point place: Q
1 min=Q
1, Q
1 max=Q
1+ Q
c1, Q
2 min=Q
2, Q
2 max=Q
2+ Q
c2, Q
3 min=Q
3, Q
3 max=Q
3+ Q
c3, and by the bound of the reactive power regulating power of critical point G1, G2, G3 that obtains and total active-power P
1, P
2, P
3send Two-stage control module SS to.
4) circuit M1, M2, M3 of critical point G1, G2, G3 and corresponding medium voltage distribution network thereof are equivalent to active power and fix and reactive power adjustable load within the specific limits by Two-stage control module SS, the active power of equivalent load is respectively P1, P2, P3, and the adjustable range of reactive power is respectively (Q
1 min, Q
1 max), (Q
2 min, Q
2 max), (Q
3 min, Q
3 max); Under voltage acceptance condition, Two-stage control module SS with the loss minimization of high voltage distribution network H for target, with the voltage of voltage power-less equipment in high voltage distribution network, Reactive-power control ability, the upper and lower limit of the reactive power regulating power at critical point place is as constraint, and the optimization carrying out the overall situation calculates;
5) Two-stage control module SS calculates through the optimization of the overall situation, draw each critical point G1, G2, G3 corresponding etc. the node voltage optimal value V of duty value
1 opt, V
2 opt, V
3 opt, draw each critical point G1, G2, G3 corresponding etc. the power factor optimal value of duty value
as balance node voltage optimal value and the power factor optimal value of circuit in the medium voltage distribution network that critical point place is corresponding, consider the uncertainty of load prediction and the voltage regulation capability at each critical point place, corresponding critical point G1, G2, G3 provide the offset Δ V of the voltage that one allows respectively
1, Δ V
2, Δ V
3, allow balance node voltage at voltage optimized scope (V
i opt-Δ V
i, V
i opt+ Δ V
i) interval interior adjustment; Corresponding critical point described in each provides a power factor side-play amount respectively
obtain the power factor optimized scope that critical point described in each is corresponding
the reactive power of duty value that waits allowing critical point described in each corresponding regulates in described power factor optimized scope; Described voltage optimized scope and power factor optimized scope are sent to corresponding described critical point G1, G2, G3 and described one-level control module PS1, PS2, PS3 by described Two-stage control module respectively;
6) one-level control module PS1, PS2, PS3 is after receiving the voltage optimized scope and power factor optimized scope that Two-stage control module issues, respectively with corresponding medium voltage distribution network M1, M2, the loss minimization of M3 is target, with the voltage regulation limits of the voltage power-less equipment in the low and medium voltage distribution network that critical point is corresponding, reactive power adjustable range, the voltage regulation limits of adjustable DG, reactive power adjustable range, on the voltage at critical point place, lower limit, capacitor group switching capacity is as constraint, be optimized calculating respectively, calculate critical point G1, G2, the optimal voltage value V of G3
1 p, V
2 p, V
3 p, optimal power factor Q
1 p, Q
2 p, Q
3 p, i.e. the optimal voltage value of the balance node of low and medium voltage distribution network circuit and optimal power factor,
7) optimal voltage value and optimal power factor that critical point place voltage optimized scope and power factor scope that Two-stage control module SS issues and one-level control module PS1, PS2, PS3 optimize the critical point place calculated is compared, if one-level control module obtains described optimal voltage value in described voltage optimized scope, described optimal power factor is in described power factor optimized scope, then this time the cooperation control in cycle completes, otherwise considers the power factor side-play amount that adjustment critical point place allows
or voltage deviation Δ V
1, Δ V
2, Δ V
3, and return step 3) re-start and optimize calculating.
Above execution mode is only for illustration of the present invention, but not limitation of the present invention.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, various combination, amendment or equivalent replacement are carried out to technical scheme of the present invention, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (10)
1. based on a power distribution network secondary coordinated control system for load prediction, it is characterized in that, described system comprises critical point, one-level control module, Two-stage control module;
Described critical point is arranged at the on high-tension side bus place of transformer or the bus place of low-pressure side that connect high voltage distribution network and low and medium voltage distribution network; For obtaining the maximum compensation ability of total active power at critical point place, total reactive power, reactive apparatus according to load prediction;
Described one-level control module calculates the upper and lower limit of the reactive power regulating power at critical point described in each according to the maximum compensation ability of described total reactive power, reactive apparatus, send it to Two-stage control module together with described total active power at corresponding critical point;
Described Two-stage control module, according to the upper and lower limit of described reactive power regulating power and described total active power, calculates voltage optimized scope and the power factor optimized scope at corresponding critical point, and is handed down to the described critical point of described one-level control module and correspondence;
Described one-level control module issue according to described Two-stage control module each described in the described voltage optimized scope at critical point and described power factor optimized scope, be optimized calculating, show that the optimal voltage of each control appliance in the mid & low-voltage line that the optimal voltage value at critical point described in each, optimal power factor and described critical point are corresponding is idle to exert oneself, and the optimal voltage value at critical point described in each and optimal power factor are returned to corresponding critical point;
Described critical point judges described optimal voltage value, optimal power factor whether respectively in described voltage optimized scope and power factor optimized scope, if, by described one-level control module according to the idle voltage power-less device action controlled by communicator in mesolow distribution line of exerting oneself of described optimal voltage; Otherwise revise described voltage optimized scope or power factor optimized scope by described Two-stage control module, and be again handed down to described one-level control module.
2. system according to claim 1, is characterized in that, the corresponding transformer in critical point described in each, and described one-level control module arranges the operating state at corresponding described critical point according to the running status of transformer, is specially:
When described transformer is one, the critical point of its correspondence normally works;
Described transformer is multiple stage and split operation, and the critical point that each described transformer is corresponding all normally works;
Described transformer be multiple stage and paired running time, the critical point that wherein described transformer is corresponding normally works, and the critical point that transformer described in all the other is corresponding is closed.
3. system according to claim 2, is characterized in that, described critical point also comprises measuring component, is arranged at the bus place of described step down side, for monitoring voltage and power.
4. system according to claim 3, is characterized in that, described measuring component comprises voltage transformer summation current transformer.
5., based on a power distribution network secondary control method for coordinating for load prediction, it is characterized in that, said method comprising the steps of:
S1, setup control cycle;
S2, each critical point operating state is set;
S3, described control cycle start, and one-level control module calculates the upper and lower limit of the reactive power regulating power at critical point described in each;
S4, described one-level control module send total active power corresponding to the upper and lower limit of the described reactive power regulating power at each critical point and each critical point of obtaining according to load prediction to Two-stage control module;
S5, described Two-stage control module, the duty value such as the one-level control module of each critical point described and correspondence to be equivalent to respectively, using total active power corresponding for critical point described in each as the active power waiting duty value, the upper and lower limit of the reactive power regulating power at critical point described in each is carried out overall optimization calculating as the adjustable extent of equivalent reactive load power, obtains the node voltage optimal value and the power factor optimal value that wait duty value that critical point described in each is corresponding;
S6, described Two-stage control module calculate voltage optimized scope and power factor optimized scope according to described voltage optimal value and power factor optimal value, and send it to corresponding described critical point and described one-level control module respectively by communication system;
S7, described one-level control module are according to described voltage optimized scope corresponding to each critical point and power factor optimized scope, be optimized calculate each critical point place optimal voltage value, the optimal voltage of each control appliance is idle in mid & low-voltage line corresponding to optimal power factor and described critical point exerts oneself, and described optimal voltage value and optimal power factor is sent to corresponding described critical point;
Whether S8, described critical point judge respectively to described optimal voltage value and optimal power factor in described voltage optimized scope and power factor optimized scope, if, then by described one-level control module, idle for described optimal voltage exerting oneself is handed down to the voltage power-less equipment in mesolow distribution line by communication system and is controlled its action; Otherwise adjust described voltage optimized scope or power factor optimized scope, and return step S3.
6. method according to claim 5, is characterized in that, when described step S3 starts, is first obtained the maximum compensation ability of total active power corresponding to critical point described in each, total reactive power, reactive apparatus by load prediction by described critical point.
7. method according to claim 6, it is characterized in that, after described step S3 obtains the maximum compensation ability of described total active power, total reactive power, reactive apparatus, obtained the maximum compensation ability of total reactive power, reactive apparatus by described one-level control module according to critical point described in each, calculate the upper and lower limit of the reactive power regulating power at critical point described in each: Q
i min=Q
i, Q
i max=Q
i+ Q
ci; Wherein Q
i minbe the lower limit of the reactive power regulating power at i-th critical point, Q
i maxbe the upper limit of the reactive power regulating power at i-th critical point, Q
ibe total reactive power at i-th critical point, Q
ciit is the maximum compensation ability of the reactive apparatus at i-th critical point.
8. method according to claim 5, it is characterized in that, in described step S5 with the loss minimization of high voltage distribution network corresponding to critical point described in each for target, in described high voltage distribution network, the voltage regulation capability of voltage power-less equipment, reactive power regulating power are optimized calculating as constraint.
9. method according to claim 5, it is characterized in that, in described step S6, voltage optimized scope deterministic process is specially: the corresponding critical point described in each of described Two-stage control module provides a voltage deviation respectively, obtains the voltage optimized scope (V that critical point described in each is corresponding
i opt-Δ V
i, V
i opt+ Δ V
i), wherein V
i optbe described voltage optimal value corresponding to i-th critical point, Δ V
ibe described voltage deviation corresponding to i-th critical point, the node voltage of duty value that waits allowing critical point described in each corresponding regulates in described voltage optimized scope;
In described step S6, optimal power factor optimized scope deterministic process is specially: the corresponding critical point described in each of described Two-stage control module provides a power factor side-play amount respectively, obtains the power factor optimized scope that critical point described in each is corresponding
wherein
be described power factor optimal value corresponding to i-th critical point,
be described power factor side-play amount corresponding to i-th critical point, the reactive power of duty value that waits allowing critical point described in each corresponding regulates in described power factor optimized scope.
10. method according to claim 5, it is characterized in that, in described step S7 with the loss minimization of low and medium voltage distribution network corresponding to each critical point for target, with the voltage regulation limits of the voltage power-less equipment in the low and medium voltage distribution network that critical point described in each is corresponding, reactive power adjustable range, the voltage regulation limits of distributed power generation unit, reactive power adjustable range, the voltage bound at critical point place, as constraint, is exerted oneself as control variables is optimized calculating with the voltage power-less of the voltage & var control equipment of the mid & low-voltage line of the voltage at described critical point and correspondence.
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| CN104868482A (en) * | 2015-05-06 | 2015-08-26 | 国家电网公司 | Capacitance compensating system for minimizing whole-day active power loss of distribution network |
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| CN108988329B (en) * | 2018-08-01 | 2021-04-23 | 国网安徽省电力有限公司培训中心 | Energy-saving power generation dispatching controller and dispatching method for power system |
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