CN104319783B - A kind of power distribution network based on load prediction two grades of coordinated control systems and methods - Google Patents
A kind of power distribution network based on load prediction two grades of coordinated control systems and methods Download PDFInfo
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- CN104319783B CN104319783B CN201410498352.4A CN201410498352A CN104319783B CN 104319783 B CN104319783 B CN 104319783B CN 201410498352 A CN201410498352 A CN 201410498352A CN 104319783 B CN104319783 B CN 104319783B
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Abstract
The invention discloses a kind of power distribution network based on load prediction two grades of coordinated control systems and methods；The system of the present invention includes critical point, one-level control module, Two-stage control module.The method design core of the present invention is: 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 high voltage distribution network regulating and controlling voltage ability to low and medium voltage distribution network, embody again the low and medium voltage distribution network reactive power compensation planning to high voltage distribution network.By the system and method for the present invention, it is achieved the coordination optimization of high voltage distribution network and low and medium voltage distribution network controls, in global scope, realize the voltage of entirety, reactive power optimized control, thus be effectively reduced via net loss, improve the voltage levvl of power distribution network.
Description
Technical field
The present invention relates to voltage & var control technical field, be more particularly to a kind of power distribution network based on load prediction two grades
Coordinated control system and method.
Background technology
Voltage & var control, is after the active power dispatch of electrical network completes, to Capacitor banks, load tap changer, distribution
The voltage of formula power supply and idle exert oneself etc. are controlled, so that the running status of electrical network trends towards optimum.Voltage power-less excellent
Change and control, be possible not only to improve the quality of power supply and voltage stability margin, it is also possible to effectively reduce via net loss.
The electric pressure that power distribution network relates to is more, including 110kV, 35kV, 10kV, 0.4kV etc.；Circuit radially divides
Cloth, interstitial content is many and disperses, and voltage power-less regulation number of devices is big and is distributed in different electric pressures；Communication channel is thin
Weak, the control target 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 power distribution network
Run and control more complicated.
At present, mostly the control mode of power distribution network is to use centralized Control or distributed AC servo system.Centralized Control is in scheduling certainly
On the basis of dynamicization system, gather the data of the whole network, main website automatic voltage control system AVC the whole network carried out entirety
Optimize and calculate, directly controlled the execution of voltage power-less equipment by communication port.Distributed AC servo system be power distribution network is divided into multiple
Subnet, controls with monitoring in SCADA (Supervisory Control And Data Acquisition) system, i.e. data acquisition
On the basis of system processed, each subnet is optimized calculating respectively, thus controls the voltage power-less device action in subnet.But two
Person has certain defect, and communication level and computing capability are required higher by centralized Control, and require that there is the whole network in control centre
Related data, and when system scale is the biggest, calculating solves extremely complex；And distributed AC servo system is more in view of each subnet
Optimum control in region, coordinating between each region is relatively difficult to achieve with overall optimum.Particularly when substantial amounts of distributed electrical
After power distribution network is accessed in source, voltage power-less regulation number of devices sharply increases, it is considered to the uncertainty of distributed power source, controls more
Add complexity, the voltage & var control mode of existing power distribution network is proposed stern challenge.
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 of control
The research of method and strategy is just for substation level and above power distribution network, and the research to 10kV and level below power distribution network is little.
And along with increasing distributed power source accesses medium voltage distribution network (10kV), power distribution network there has also been the strongest voltage power-less regulation
And control ability, it is necessary to consider the voltage & var control of low and medium voltage distribution network.Owing to low and medium voltage distribution network line node number is many
Many, detailed modeling can not be carried out in high voltage distribution network side, it is common that low in connecing under transformer station at step-down substation
It is press-fitted electrical network and is equivalent to duty value, ignore its concrete topological structure；In like manner, in the model of low and medium voltage distribution network, generally
High voltage distribution network is equivalent to equivalent power supply.So, model information imperfection, to high voltage distribution network and the association of low and medium voltage distribution network
Regulation and control system brings certain difficulty.
Summary of the invention
(1) to solve the technical problem that
The technical problem to be solved in the present invention is how to realize the whole network voltage, reactive power overall situation Optimal Distribution and control
System.
(2) technical scheme
In order to solve above-mentioned technical problem, the invention provides a kind of power distribution network based on load prediction two grades and coordinate to control
System, described system includes critical point, one-level control module, Two-stage control module；
Described critical point be arranged at the on high-tension side bus of the transformer connecting high voltage distribution network and low and medium voltage distribution network or
At the bus of low-pressure side；For obtaining the total active power at critical point, total reactive power, reactive apparatus according to load prediction
Large compensation ability；
Described one-level control module calculates described in each according to the maximum compensation ability of described total reactive power, reactive apparatus
The upper and lower limit of the reactive power regulating power at critical point, sends them to two grades together with described total active power at corresponding critical point
Control module；
Described Two-stage control module according to the upper and lower limit of described reactive power regulating power and described total active power,
Calculate voltage optimized scope and the power factor optimized scope at corresponding critical point, and be handed down to described one-level control module and correspondence
Described critical point；
The described voltage at each described critical point that described one-level control module issues according to described Two-stage control module is optimum
Scope and described power factor optimized scope, with the magnitude of voltage at described critical point and the voltage power-less of the mid & low-voltage line of correspondence
The voltage power-less of control equipment is exerted oneself etc. and to be optimized calculating for control variables, draw each described critical point optimal voltage value,
In the mid & low-voltage line that optimal power factor is corresponding with described critical point, the optimal voltage of each control equipment is idle exerts oneself, and by each
The optimal voltage value at described critical point and optimal power factor return to the critical point of correspondence；
Described critical point judges that described optimal voltage value, optimal power factor are the most respectively in described voltage optimized scope and merit
In rate factor optimized scope, if, described one-level control module pass through communicator according to idle the exerting oneself of described optimal voltage
Control the voltage power-less device action in mesolow distribution line；Otherwise revised described voltage by described Two-stage control module optimum
Scope or power factor optimized scope, and again it is handed down to described one-level control module.
Preferably, the corresponding transformer in each described critical point, described one-level control module is according to the operation shape of transformer
State arranges the duty at corresponding described critical point, particularly as follows:
When described transformer is one, the critical point of its correspondence normally works；
When described transformer is multiple stage and fanout operation, the critical point that each described transformer is corresponding the most normally works；
When described transformer is multiple stage and paired running, the critical point that wherein described transformer is corresponding normally works, its
The critical point that remaining described transformer is corresponding is closed.
Preferably, described critical point also includes measuring cell, is arranged at the bus of described step down side, for electricity
Pressure and power are monitored.
Preferably, described measuring cell includes voltage transformer summation current transformer.
The invention also discloses two grades of control method for coordinating of a kind of power distribution network based on load prediction, described method include with
Lower step:
S1, setup control cycle；
S2, each critical point duty is set；
S3, described control cycle, one-level control module is calculated the reactive power regulation energy at each described critical point
The upper and lower limit of power；
S4, described one-level control module by the upper and lower limit of the described reactive power regulating power at each critical point and according to
Total active power corresponding to each critical point that load prediction obtains sends Two-stage control module to；
S5, described Two-stage control module, be equivalent to equivalence respectively by the one-level control module at each critical point described and correspondence
Load, using the upper and lower limit of the reactive power regulating power at corresponding critical point as constraint, by each described critical point and correspondence thereof
The line equivalent of low and medium voltage distribution network be active power it is known that and the most adjustable load of reactive power, specifically
For using total active power corresponding for each described critical point as wait duty value active power, by the idle merit at each described critical point
The upper and lower limit of rate regulating power carries out overall optimization calculating as the adjustable extent of equivalent reactive load power, obtains each
The node voltage optimal value of the duty value such as grade that described critical point is corresponding and power factor optimal value；
It is optimum that S6, described Two-stage control module are calculated voltage according to described voltage optimal value and power factor optimal value
Scope and power factor optimized scope, and be respectively transmitted to corresponding described critical point and described one-level by communication system
Control module；
S7, described one-level control module are according to described voltage optimized scope corresponding to each critical point and power factor optimum model
Enclose, exert oneself with the voltage power-less of the magnitude of voltage at described critical point and the voltage & var control equipment of the mesolow link of correspondence
It is optimized for control variables that to calculate optimal voltage value at each critical point, optimal power factor corresponding with described critical point
In mid & low-voltage line, the optimal voltage of each control equipment is idle exerts oneself, and by described optimal voltage value and optimal power factor transmission
Give corresponding described critical point；
S8, described critical point to described optimal voltage value and optimal power factor the most respectively in described voltage optimized scope and
Judge in power factor optimized scope, if, then by described one-level control module by idle for described optimal voltage exert oneself logical
Cross voltage power-less equipment that communication system is handed down in mesolow distribution line and control its action；Otherwise adjust described voltage
Excellent scope or power factor optimized scope, and return step S3.
Preferably, when described step S3 starts, first obtained each described critical point by described critical point by load prediction
Corresponding total active power, total reactive power, the maximum compensation ability of reactive apparatus.
Preferably, described step S3 obtains the maximum compensation ability of described total active power, total reactive power, reactive apparatus
After, described one-level control module obtain the maximum compensation ability of total reactive power, reactive apparatus according to critical point each described, meter
Calculate the upper and lower limit of the reactive power regulating power at each described critical point: Qi min=Qi, Qi max=Qi+Qci；Wherein Qi minFor i-th
The lower limit of the reactive power regulating power at critical point, Qi maxFor the upper limit of the reactive power regulating power at i-th critical point, QiFor i-th
Total reactive power at critical point, QciMaximum compensation ability for the reactive apparatus at i-th critical point.
Preferably, the loss minimization of high voltage distribution network corresponding with critical point each described in described step S5 as target, with
In described high voltage distribution network, the voltage regulation capability of voltage power-less equipment, reactive power regulating power are optimized meter as constraint
Calculate.
Preferably, in described step S6, voltage optimized scope determines process particularly as follows: described Two-stage control module is corresponding each
Individual described critical point provides a voltage deviation respectively, obtains the voltage optimized scope (V that each described critical point is correspondingi opt-ΔVi,
Vi opt+ΔVi), wherein Vi optFor the described voltage optimal value that i-th critical point is corresponding, Δ ViFor the described electricity that i-th critical point is corresponding
Pressure side-play amount, it is allowed to the node voltage of the duty value such as grade that each described critical point is corresponding regulates in described voltage optimized scope；
In described step S6, optimal power factor optimized scope determines process particularly as follows: described Two-stage control module is corresponding
Each described critical point provides a power factor side-play amount respectively, obtains the power factor optimized scope that each described critical point is correspondingWhereinFor the described power factor optimal value that i-th critical point is corresponding,For the described power factor side-play amount that i-th critical point is corresponding, it is allowed to the nothing waiting duty value that each described critical point is corresponding
Merit power regulates in described power factor optimized scope.
Preferably, the loss minimization of low and medium voltage distribution network corresponding with each critical point in described step S7 is as target, with respectively
The voltage regulation limits of voltage power-less equipment in the low and medium voltage distribution network that individual described critical point is corresponding, reactive power adjustable range,
Voltage regulation limits, reactive power adjustable range and the critical point of distributed power generation unit (Distributed Generation)
The voltage bound at place is as constraint, with the voltage at described critical point and the voltage & var control equipment of the mid & low-voltage line of correspondence
Voltage power-less exert oneself and be optimized calculating for control variables.
(3) beneficial effect
The invention provides a kind of power distribution network based on load prediction two grades of coordinated control systems and methods, the present invention is
System and method achieve the coordination between high voltage distribution network and low and medium voltage distribution network and control, and realize entirety in network-wide basis
Voltage and reactive power optimum control, thus it is effectively reduced via net loss, improve the voltage levvl of power distribution network.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is two grades of control method for coordinating flow charts of a kind of based on load prediction power distribution network of the present invention.
Detailed description of the invention
With embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.Following example are used for this is described
Bright, but can not be used for limiting the scope of the present invention.
The invention discloses two grades of coordinated control systems of a kind of power distribution network based on load prediction, described system includes: close
Mouth, one-level control module and Two-stage control module.
Critical point, for obtaining total active power at each critical point, total reactive power, reactive apparatus according to load prediction
Maximum compensation ability；It is arranged at the on high-tension side bus of the transformer connecting high voltage distribution network and low and medium voltage distribution network or low pressure
At the bus of side, every described transformer is correspondingly arranged a critical point.The optimum that described critical point issues according to one-level control module
Magnitude of voltage and optimal power factor control the transformer work of its correspondence.
One-level control module, including the circuit in the mesolow distribution that each critical point is corresponding and the distributed electrical of connection thereof
The voltage power-less equipment such as source, capacitor, also includes a controller, controls the electricity in mesolow distribution line by communication system
Pressure reactive apparatus action.Described one-level control module calculates according to the maximum compensation ability of described total reactive power, reactive apparatus
The upper and lower limit of the reactive power regulating power at each described critical point, and by its total active-power P with corresponding critical pointiPass together
Give Two-stage control module；
Two-stage control module, according to upper and lower limit and described total active power of described reactive power regulating power, calculates
The voltage optimized scope at corresponding critical point and power factor optimized scope, and it is handed down to the institute of described one-level control module and correspondence
State critical point.Described Two-stage control module, as control centre, has two-way data-transformation facility, both can control mould to one-level
Block sends instruction, can receive again the return data of one-level control module.
The voltage optimized scope at each described critical point that described one-level control module issues according to described Two-stage control module
And described power factor optimized scope, with the voltage of the mid & low-voltage line that magnitude of voltage and the corresponding critical point at described critical point connect
The voltage power-less of idle control equipment is exerted oneself etc. as control variables, calculates the optimal voltage value at each described critical point, optimum
In the mid & low-voltage line that power factor is corresponding with described critical point, the optimal voltage of each control equipment is idle exerts oneself, and by described optimum
Magnitude of voltage and optimal power factor return to the described critical point of correspondence.
Described critical point judges that described optimal voltage value, optimal power factor are the most respectively in described voltage optimized scope and merit
In rate factor optimized scope, if, described one-level control module pass through communicator according to idle the exerting oneself of described optimal voltage
Control the voltage power-less device action in mesolow distribution line；Otherwise revised described voltage by described Two-stage control module optimum
Scope or power factor optimized scope, and again it is handed down to described one-level control module.
Each described critical point is one-level control module, the interface of Two-stage control module, one-level control module, Two-stage control mould
The data interaction of block is carried out generally about the voltage at critical point and reactive power.
The duty at described critical point is controlled by one-level control module, when described transformer is one, and described transformation
The critical point that device is corresponding normally works；When described transformer is multiple stage and fanout operation, the critical point that each described transformer is corresponding
The most normally work；When described transformer is multiple stage and paired running, the critical point that wherein described transformer is corresponding normally works,
The critical point that remaining described transformer is corresponding is closed.
The critical point of described a kind of two grades of coordinated control systems of power distribution network based on load prediction also includes measuring cell, preferably
Be arranged at the bus of described step down side, for voltage and power are monitored.Described measuring cell includes electricity
Pressure transformer, current transformer and other measuring cell, by these measuring cells be possible not only to monitor critical point corresponding in
Low-voltage network circuit head end voltage and power factor, it is also possible to the voltage of the high voltage distribution network line end that monitoring critical point is corresponding
With reactive-load compensation situation, wherein said power factor calculates according to active power and reactive power and draws.
The invention also discloses two grades of control method for coordinating of a kind of power distribution network based on load prediction, described method include with
Lower step, 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, can basis
Actual conditions and demand manually set；
S2, each critical point duty is set；
S3, described control cycle, one-level control module obtains total reactive power according to critical point each described, idle sets
Standby maximum compensation ability, calculates the upper and lower limit of the reactive power regulating power at each described critical point: Qi min=Qi, Qi max=Qi
+Qci；Wherein Qi minFor the lower limit of the reactive power regulating power at i-th critical point, Qi maxReactive power for i-th critical point regulates
The upper limit of ability, QiFor total reactive power at i-th critical point, QciMaximum compensation ability for the reactive apparatus at i-th critical point；
S4, described one-level control module by the upper and lower limit of the described reactive power regulating power at each critical point and each
Total active power corresponding to critical point sends Two-stage control module to；
S5, when voltage meets the voltage levvl that system specifies, Two-stage control module is with height corresponding to critical point each described
The loss minimization being press-fitted electrical network is target, with the voltage regulation capability of voltage power-less equipment, idle merit in described high voltage distribution network
Rate regulating power, the upper and lower limit of the reactive power regulating power at corresponding critical point is as constraint, by each described critical point and right
The line equivalent of the low and medium voltage distribution network answered is the adjustable load of reactive power, by total wattful power corresponding for each described critical point
The upper and lower limit of the reactive power regulating power at each described critical point, as the active power of duty value such as grade, is born by rate as equivalence
The adjustable extent of lotus reactive power, the optimization carrying out the overall situation calculates, and obtains the node waiting duty value that each described critical point is corresponding
Voltage optimal value and power factor optimal value；Optimized model equation below.
Above in formula, object function fSFor via net loss, uSFor control variables, including reactive power, the adjustable DG at critical point
Reactive power (distributed power source Distributed Generation), balance node and the voltage magnitude etc. of PV node；xS
For state variable, including voltage and power, the power etc. of PV node of PQ node；Equality constraint includes trend constraint etc.,
Formula constraint includes the range constraint etc. of control variables and state variable, and to consider at corresponding critical point in constraints especially is idle
Power adjusting ability；In above formula, subscript S represents Two-stage control module (Secondary System)；
S6, in view of the voltage regulation capability of transformer at the uncertain and each critical point of load prediction, described two grades of controls
Molding block each described critical point corresponding provides a voltage deviation respectively, obtains the voltage optimum model that each described critical point is corresponding
Enclose (Vi opt-ΔVi, Vi opt+ΔVi), wherein Vi optFor the described voltage optimal value that i-th critical point is corresponding, Δ ViFor i-th critical point
Corresponding described voltage deviation, it is allowed to what each described critical point was corresponding waits the node voltage of duty value at described voltage optimum model
Enclose interior regulation；
Optimal power factor optimized scope determines process particularly as follows: described Two-stage control module each described critical point corresponding is divided
Do not provide a power factor side-play amount, obtain the power factor optimized scope that each described critical point is correspondingWhereinFor the described power factor optimal value that i-th critical point is corresponding,For the described power factor side-play amount that i-th critical point is corresponding, it is allowed to the nothing waiting duty value that each described critical point is corresponding
Merit power regulates in described power factor optimized scope；Described Two-stage control module by described voltage optimized scope and power because of
Number optimized scope is respectively transmitted to corresponding described critical point and described one-level control module；
S7, when voltage meets the voltage levvl that system specifies, described one-level control module is corresponding according to each critical point
Voltage optimized scope and power factor optimized scope, the loss minimization of the low and medium voltage distribution network corresponding with each critical point as target,
With the voltage regulation limits of voltage power-less equipment in the low and medium voltage distribution network that critical point each described is corresponding, reactive power regulation model
Enclose, the voltage regulation limits of adjustable DG, reactive power adjustable range, voltage bound at critical point and capacitor group switching hold
Amount, as constraint, goes out with the voltage power-less of the voltage & var control equipment of link under the voltage at described critical point and corresponding critical point
Power etc. are optimized calculating for control variables, are optimized calculating, draw the optimal voltage value at each critical point and optimal power
Factor value, Optimized model equation below
In above formula, object function fPFor loss minimization, uPFor control variables, xPFor state variable, equality constraint includes trend
Constraints etc., inequality constraints includes control variables uPWith state variable xPRange constraint etc., it is right to consider especially in constraints
Answering the voltage optimized scope at critical point and the power factor optimized scope at critical point, in above formula, subscript P represents one-level control module
(Primary System), sends the described critical point of correspondence to by described optimal voltage value and optimal power factor；
S8, described critical point to described optimal voltage value and optimal power factor the most respectively in described voltage optimized scope and
Judge in power factor optimized scope, if, then this coordination controlling the cycle has controlled, by described one-level control module
By idle for the described optimal voltage voltage power-less equipment being handed down in mesolow distribution line by communication system controlling of exerting oneself
Its action；Otherwise by adjusting the voltage deviation described voltage optimized scope of adjustment or adjusting by adjusting power factor side-play amount
Described power factor optimized scope, re-issues to described and control module, and returns step S3.
When described step S3 starts, first obtained corresponding total in each described critical point by described critical point by load prediction
Active power, total reactive power, the maximum compensation ability of reactive apparatus.
The new control cycle arrives, and starts to perform from described step S3.
The system and method for the present invention achieves the coordination between high voltage distribution network and low and medium voltage distribution network and controls, mesolow
Power distribution network proposes the constraint of reactive power adjustable range to high voltage distribution network, and high voltage distribution network proposes electricity to low and medium voltage distribution network simultaneously
Pressure adjustable range constraint, both sides consider the constraint that the other side proposes, had both embodied high voltage distribution network when self being optimized calculating
Regulating and controlling voltage ability to low and medium voltage distribution network, embodies again the low and medium voltage distribution network reactive power compensation planning to high voltage distribution network.
By the system and method for the present invention, it is achieved the coordination optimization of high voltage distribution network and low and medium voltage distribution network controls, in global scope
The voltage of interior realization entirety, reactive power optimized control, thus it is effectively reduced via net loss, improve the voltage water of power distribution network
Flat.
One embodiment of the method for the present invention:
The present embodiment considers the coordination voltage control between a high voltage distribution network H and three medium voltage distribution networks M1, M2, M3
System, wherein high voltage distribution network H is as higher level's electrical network, controls 66kV electric pressure electrical network and by step-up transformer and 66kV electrical network
Be connected a wind energy turbine set and a thermal power plant, medium voltage distribution network control 10kV electric pressure electrical network, high voltage distribution network and in
Be press-fitted electrical network to be connected by the transformer of 66/10kV, wherein, three medium voltage distribution networks M1, M2, M3 respectively by transformer T1,
T2, T3 are connected with high voltage distribution network H.High voltage distribution network H is controlled by Two-stage control module (Secondary System) SS, three
Medium voltage distribution network M1, M2, M3 are controlled by one-level control module (Primary System) PS1, PS2, PS3 respectively.
Concrete rate-determining steps is as follows:
1) being 5 minutes according to predetermined period of ultra-short term data, the setup control cycle is 5 minutes；
2) low-pressure side at transformer T1, T2, T3 of connecting high voltage distribution network and medium voltage distribution network sets up critical point respectively, life
Entitled G1, G2, G3, three critical points are connected respectively high voltage distribution network H and three medium voltage distribution networks M1, M2, M3；
3) when one control the cycle arrive time, one-level control module PS1, that PS2, PS3 obtain according to load prediction data is right
Answer total active-power P of critical point G1, G2, G31、P2、P3With total reactive power Q1、Q2、Q3, and the reactive apparatus at each critical point
Maximum compensation ability Qc1、Qc2、Qc3, calculate the bound of reactive power regulating power at corresponding critical point: Q1 min=Q1,
Q1 max=Q1+ Qc1,Q2 min=Q2,Q2 max=Q2+ Qc2,Q3 min=Q3,Q3 max=Q3+Qc3, and critical point G1, G2, the G3 that will obtain
The bound of reactive power regulating power and total active-power P1、P2、P3Send 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 by Two-stage control module SS
Active power is fixed and the most adjustable load of reactive power, the active power of equivalent load be respectively P1, P2,
P3, the adjustable range of reactive power is respectively (Q1 min, Q1 max)、(Q2 min, Q2 max)、(Q3 min, Q3 max)；In voltage acceptance condition
Under, Two-stage control module SS is with the loss minimization of high voltage distribution network H as target, with the electricity of voltage power-less equipment in high voltage distribution network
Pressure, Reactive-power control ability, the upper and lower limit of the reactive power regulating power at critical point calculates as constraint, the optimization carrying out the overall situation；
5) Two-stage control module SS calculates through the optimization of the overall situation, draw each critical point G1, G2, G3 corresponding etc. duty value
Node voltage optimal value V1 opt、V2 opt、V3 opt, draw each critical point G1, G2, G3 corresponding etc. the power factor optimal value of duty value As the balance node voltage optimal value of circuit in medium voltage distribution network corresponding at critical point and power because of
Number optimal value, it is contemplated that the voltage regulation capability at the uncertain and each critical point of load prediction, correspondence critical point G1, G2, G3 divide
Do not provide offset Δ V of the voltage allowed1、ΔV2、ΔV3, it is allowed to balance node voltage is at voltage optimized scope (Vi opt-
ΔVi, Vi opt+ΔVi) interval interior regulation；Each described critical point corresponding provides a power factor side-play amount respectivelyObtain the power factor optimized scope that each described critical point is corresponding
The reactive power waiting duty value allowing each described critical point corresponding regulates in described power factor optimized scope；Described two grades
Described voltage optimized scope and power factor optimized scope are respectively transmitted to corresponding described critical point G1, G2, G3 by control module
And described one-level control module PS1, PS2, PS3；
6) one-level control module PS1, PS2, PS3 receive voltage optimized scope that Two-stage control module issues and power because of
After number optimized scope, respectively with the loss minimization of corresponding medium voltage distribution network M1, M2, M3 as target, with the mesolow that critical point is corresponding
The voltage regulation limits of voltage power-less equipment in power distribution network, reactive power adjustable range, the voltage regulation limits of adjustable DG, nothing
Voltage bound at merit power regulating range, critical point and capacitor group switching capacity, as constraint, are optimized meter respectively
Calculate, calculate optimal voltage value V of critical point G1, G2, G31 P、V2 P、V3 PWith optimal power factor Q1 P、Q2 P、Q3 P, i.e. mesolow
The optimal voltage value of the balance node of distribution network line and optimal power factor；
7) compare voltage optimized scope and power factor scope and one-level at the critical point that Two-stage control module SS issues to control
Module PS1, PS2, PS3 optimize the optimal voltage value at the critical point calculated and optimal power factor, if one-level control module
Obtaining described optimal voltage value in described voltage optimized scope, described optimal power factor is in described power factor optimized scope
In, then this time the coordination in cycle has controlled, and otherwise considers to adjust the power factor side-play amount allowed at critical pointOr voltage deviation Δ V1、ΔV2、ΔV3, and return step 3) re-start optimization
Calculate.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention.Although with reference to embodiment to this
Bright be described in detail, it will be understood by those within the art that, technical scheme is carried out various combination,
Amendment or equivalent, without departure from the spirit and scope of technical solution of the present invention, all should contain the right in the present invention and want
Ask in the middle of scope.
Claims (10)
1. two grades of coordinated control systems of a power distribution network based on load prediction, it is characterised in that described system include critical point, one
Level control module, Two-stage control module；
Described critical point is arranged at the on high-tension side bus of the transformer connecting high voltage distribution network and low and medium voltage distribution network or low pressure
At the bus of side；For obtaining the maximum benefit of the total active power at critical point, total reactive power, reactive apparatus according to load prediction
Repay ability；
Described one-level control module calculates each described critical point according to the maximum compensation ability of described total reactive power, reactive apparatus
The upper and lower limit of reactive power regulating power, send it to Two-stage control together with described total active power at corresponding critical point
Module；
Described Two-stage control module, according to the upper and lower limit of described reactive power regulating power and described total active power, calculates
The voltage optimized scope at corresponding critical point and power factor optimized scope, and it is handed down to the institute of described one-level control module and correspondence
State critical point；
The described voltage optimized scope at each described critical point that described one-level control module issues according to described Two-stage control module
And described power factor optimized scope, be optimized calculating, draw the optimal voltage value at each described critical point, optimal power because of
In the mid & low-voltage line that number is corresponding with described critical point, the optimal voltage of each control equipment is idle exerts oneself, and by each described critical point
Optimal voltage value and optimal power factor return to the critical point of correspondence；
Described critical point judge described optimal voltage value, optimal power factor the most respectively described voltage optimized scope and power because of
In number optimized scope, if, described one-level control module exert oneself by communicator control according to described optimal voltage is idle
Voltage power-less device action in mesolow distribution line；Otherwise revised described voltage optimized scope by described Two-stage control module
Or power factor optimized scope, and again it is handed down to described one-level control module.
System the most according to claim 1, it is characterised in that the corresponding transformer in each described critical point, described one-level
Control module arranges the duty at corresponding described critical point according to the running status of transformer, particularly as follows:
When described transformer is one, the critical point of its correspondence normally works；
When described transformer is multiple stage and fanout operation, the critical point that each described transformer is corresponding the most normally works；
When described transformer is multiple stage and paired running, the critical point that wherein described transformer is corresponding normally works, remaining institute
State critical point corresponding to transformer to close.
System the most according to claim 2, it is characterised in that described critical point also includes measuring cell, is arranged at described change
At the bus of depressor low-pressure side, for voltage and power are monitored.
System the most according to claim 3, it is characterised in that described measuring cell includes voltage transformer and Current Mutual Inductance
Device.
5. two grades of control method for coordinating of a power distribution network based on load prediction, it is characterised in that described method includes following step
Rapid:
S1, setup control cycle；
S2, each critical point duty is set；
S3, described control cycle, one-level control module is calculated the reactive power regulating power at each described critical point
Upper and lower limit；
S4, described one-level control module are by the upper and lower limit of the described reactive power regulating power at each critical point and according to load
Total active power corresponding to each critical point of obtaining of prediction sends Two-stage control module to；
S5, described Two-stage control module, the duty value such as be equivalent to respectively by the one-level control module at each critical point described and correspondence,
Using total active power corresponding for each described critical point as the active power waiting duty value, by the reactive power at each described critical point
The upper and lower limit of regulating power carries out overall optimization calculating as the adjustable extent of equivalent reactive load power, obtains each institute
State the node voltage optimal value waiting duty value corresponding to critical point and power factor optimal value；
S6, described Two-stage control module are calculated voltage optimized scope according to described voltage optimal value and power factor optimal value
With power factor optimized scope, and it is respectively transmitted by communication system and is controlled to corresponding described critical point and described one-level
Module；
S7, described one-level control module according to described voltage optimized scope corresponding to each critical point and power factor optimized scope,
Be optimized and calculate optimal voltage value at each critical point, mid & low-voltage line that optimal power factor is corresponding with described critical point
In each optimal voltage controlling equipment is idle exerts oneself, and to described optimal voltage value and optimal power factor are sent the institute of correspondence
State critical point；
S8, described critical point to described optimal voltage value and optimal power factor the most respectively at described voltage optimized scope and power
Judge in factor optimized scope, if, then exerted oneself idle for described optimal voltage by logical by described one-level control module
Voltage power-less equipment that communication system is handed down in mesolow distribution line also controls its action；Otherwise adjust described voltage optimum model
Enclose or power factor optimized scope, and return step S3.
Method the most according to claim 5, it is characterised in that when described step S3 starts, is first passed through by described critical point
Load prediction obtains the maximum compensation ability of total active power corresponding at each described critical point, total reactive power, reactive apparatus.
Method the most according to claim 6, it is characterised in that described step S3 obtains described total active power, the most idle
Power, reactive apparatus maximum compensation ability after, described one-level control module obtain total idle merit according to critical point each described
Rate, the maximum compensation ability of reactive apparatus, calculate the upper and lower limit of the reactive power regulating power at each described critical point: Qi min=
Qi, Qi max=Qi+Qci；Wherein Qi minFor the lower limit of the reactive power regulating power at i-th critical point, Qi maxNothing for i-th critical point
The upper limit of merit power adjusting ability, QiFor total reactive power at i-th critical point, QciMaximum for the reactive apparatus at i-th critical point
Compensation ability.
Method the most according to claim 5, it is characterised in that with high pressure that critical point each described is corresponding in described step S5
The loss minimization of power distribution network is target, with the voltage regulation capability of voltage power-less equipment, reactive power in described high voltage distribution network
Regulating power is optimized calculating as constraint.
Method the most according to claim 5, it is characterised in that in described step S6, voltage optimized scope determines that process has
Body is: described Two-stage control module each described critical point corresponding provides a voltage deviation respectively, obtains each described critical point
Corresponding voltage optimized scope (Vi opt-ΔVi, Vi opt+ΔVi), wherein Vi optThe described voltage corresponding for i-th critical point is optimum
Value, Δ ViFor the described voltage deviation that i-th critical point is corresponding, it is allowed to what each described critical point was corresponding waits the node electricity of duty value
It is pressed in regulation in described voltage optimized scope；
In described step S6, optimal power factor optimized scope determine process particularly as follows: described Two-stage control module corresponding each
Described critical point provides a power factor side-play amount respectively, obtains the power factor optimized scope that each described critical point is correspondingWhereinFor the described power factor optimal value that i-th critical point is corresponding,For the described power factor side-play amount that i-th critical point is corresponding, it is allowed to the nothing waiting duty value that each described critical point is corresponding
Merit power regulates in described power factor optimized scope.
Method the most according to claim 5, it is characterised in that with mesolow that each critical point is corresponding in described step S7
The loss minimization of power distribution network is target, with the voltage of the voltage power-less equipment in the low and medium voltage distribution network that critical point each described is corresponding
Adjustable range, reactive power adjustable range, the voltage regulation limits of distributed power generation unit, reactive power adjustable range and pass
Voltage bound at Kou as constraint, sets with the voltage & var control of the voltage at described critical point and the mid & low-voltage line of correspondence
Standby voltage power-less is exerted oneself and is optimized calculating for control variables.
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| CN105262098B (en) * | 2015-10-23 | 2017-12-12 | 海南电网有限责任公司 | The quick automatic voltage control method assessed based on the fluctuation of wind power plant generated output |
| CN106655212B (en) * | 2016-12-23 | 2019-03-22 | 海南电网有限责任公司 | The reactive power compensation integrated control method of passive power distribution net and system |
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| CN110601219A (en) * | 2019-11-04 | 2019-12-20 | 中能建江苏能源科技有限公司 | Distributed power generation system reactive compensation method based on examination and prediction |
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