CN109066822A - A kind of multi-point dispersion formula distribution system dispatching method based on electric power electric transformer - Google Patents
A kind of multi-point dispersion formula distribution system dispatching method based on electric power electric transformer Download PDFInfo
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- CN109066822A CN109066822A CN201810790548.9A CN201810790548A CN109066822A CN 109066822 A CN109066822 A CN 109066822A CN 201810790548 A CN201810790548 A CN 201810790548A CN 109066822 A CN109066822 A CN 109066822A
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of multi-point dispersion formula distribution system operation reserve based on electric power electric transformer, belongs to micro-grid connection synthetic operation technical field.This method is in entire distribution system steady-state operation, it is optimized first in control centre and distribution system controllable dispatching method is calculated, then activity of force is adjusted out using each distributed unit in the independently adjustable Characteristics Control direct-current grid of electric power electric transformer low-pressure side voltage, realize wind-light storage complementation optimization operation and peak load shifting is carried out to power distribution network.The adjustable characteristic of AC side Power Factor is pressed using electric power electric transformer simultaneously, the trend of real-time control AC distribution net realizes distribution power flow optimization.Method structure of the invention is simple, well arranged and be easily achieved, hardware communication cost can be saved and simplify system control, electric power electric transformer effect played in the grid-connected distribution system operation of multiple direct-current grids is given full play to, this method has extensive adaptability and scalability.
Description
Technical field
The present invention relates to a kind of multi-point dispersion formula distribution system dispatching method based on electric power electric transformer, belongs to power grid
Grid-connected synthetic operation technical field.
Background technique
In order to solve the problems occurred in distributed energy utilization, micro-capacitance sensor is more and more weighed by researcher
Depending on.According to the difference of distributed generation resource and load access bus, micro-capacitance sensor is divided into exchange micro-capacitance sensor and direct-current grid, direct current are micro-
Web frame is simple, and conversion links are few, the problem of conducive to idle and phase is not present in the access of distributed energy and load, and
And be easier to carry out voltage control, there is certain advantage relative to AC microgrids；Direct-current grid has if there is bulk power grid
Power support is then easier to maintain the power-balance inside microgrid, can be improved the stability of operation.It is micro- for power distribution network
A variety of distributed resources integrate then concentrating and are incorporated to by power grid, can not only be reduced renewable energy and are directly accessed power distribution network
Bring influences, and mutually coordinated operation between each microgrid, can be improved power distribution network operation stability and power supply can
By property.Therefore, direct-current grid accesses power distribution network, and composition multi-point dispersion formula distribution system operation will become renewable energy utilization
Effective means.
The access of distributed energy and micro-capacitance sensor produces great influence to power distribution network operation, increases distribution system analysis
Complexity.
And at present related micro-capacitance sensor be incorporated to major network operation research mostly by micro-capacitance sensor be considered as a power controllably it is grid-connected
Unit, there is no the internal structure and its control strategy of deep consideration to the connect microgrid of AC distribution net, in direct-current micro-grid not
Only photovoltaic (PV) unit, energy storage (BES) unit and controllable burden, and to be distributed in source, storage, lotus each for all kinds of converter plants
Link is the complication system comprising more power supplys, multiple transformer, will lead to communications difficulties using master & slave control and increase, and to master
Control cell stability has high requirement, and communication line also will limit the distance between each unit, if main control unit or communication
Line breaks down, then will lead to entire direct current micro-grid system paralysis；At present for the research of direct-current grid equity control, mainly
It is by direct-current grid and AC distribution net.Between grid-connected inverter or microgrid in each unit converter Control direct current it is female
Line voltage realizes each unit power distribution, and this control method tends not to avoid DC bus and points of common connection
At (Point of Common Coupling, PCC) the problem of power quality.
PET (Power Electronic Transformer, PET) be one kind with Development of Power Electronic Technology and gradually
The new distribution potential device to attract attention.Electric power electric transformer has exchange interface and DC interface, while having following excellent
Point 1. can be with flexible modulation ac high-voltage side power factor and electric current；2. it can guarantee that DC low-voltage side output voltage is constant, because
This being capable of stability contorting DC bus-bar voltage；3. controllability is high, and more electric power electric transformers can pass through fiber cluster.
These advantages of electric power electric transformer make control centre can pass through electric power electric transformer to connection direct-current grid and
The points of common connection of AC distribution net carries out energy management, and can be with the trend of real-time control power distribution network.It can be seen that electric power
Electronic transformer will play a significant role in direct-current micro-grid is incorporated into the power networks.
Summary of the invention
The purpose of the present invention is to propose to a kind of multi-point dispersion formula distribution system dispatching method based on electric power electric transformer,
Energy management is carried out to the multi-point dispersion formula system for connecting multiple direct-current grids by power distribution network by electric power electric transformer
With Optimized Operation, using master & slave control to face communication pressure excessive for each unit in microgrid when being incorporated into the power networks for direct-current grid,
The problem of being difficult to realize, according to the design feature of AC distribution net and its connected direct-current micro-grid in multi-point dispersion formula distribution system and
Entire multi-point dispersion formula distribution system is divided into distribution system dispatch layer by the method for operation, voltage Collaborative Control layer carries out energy
Management.
Multi-point dispersion formula distribution system dispatching method proposed by the present invention based on electric power electric transformer, including following step
It is rapid:
(1) optimal operation model of a multi-point dispersion formula distribution system is established, which includes a fortune
Row objective function is as follows:
Wherein, the direct current that will be connect by electric power electric transformer with AC distribution net in multi-point dispersion formula distribution system is micro-
Power grid is denoted as node k, and subscript k is node serial number, and n is AC distribution net node number, when L is the scheduling in a dispatching cycle
Number of segment, t are the serial number of scheduling slot, and Δ t is the duration of scheduling slot, and c is power purchase price,Respectively node k direct current
The operation unit price of photovoltaic generating system, energy-storage battery in micro-capacitance sensor,Respectively t-th of scheduling slot node k
The practical active power that photovoltaic generating system and energy-storage battery issue in direct-current grid,For t-th of scheduling slot multiple spot
Distributing distribution system interior joint k direct-current grid passes through the active power that electric power electric transformer is exchanged with AC distribution net,Indicate the practical active power cut down of controllable burden in t-th of scheduling slot node k direct-current grid,It is adjusted for t-th
It spends in period node k direct-current grid and carries out the unit compensation expense of load reduction, P to controllable burdeniIt (t) is t-th of scheduling
The load active power of period multi-point dispersion formula distribution system interior joint i, Ui(t)、UjIt (t) is respectively t-th of scheduling slot multiple spot
The voltage of distributing distribution system interior joint i, node j, yijFor the admittance between node i, node j；
The constraint condition of optimal operation model includes:
Trend constraint are as follows:
The active power constraint that AC distribution net is exchanged with higher level's power grid are as follows:
The constraint of AC distribution net node voltage are as follows:
The active power constraint that AC distribution net is exchanged with direct-current grid are as follows:
The electric power electric transformer capacity-constrained of connection exchange micro-capacitance sensor and node k direct-current grid are as follows:
Node k direct-current grid power-balance constraint are as follows:
The power constraint of photovoltaic generating system in node k direct-current grid are as follows:
Energy-storage battery charge-discharge electric power constrains in node k direct-current grid are as follows:
The energy constraint that energy-storage battery remaining capacity need to meet in node k direct-current grid are as follows:
The electricity of energy-storage battery starts the constraint being consistent with finish time in dispatching cycle in node k direct-current grid
Are as follows:
Ek(L)=Ek(0)
The relationship that each moment remaining capacity of energy-storage battery and charge-discharge electric power meet in node k direct-current grid are as follows:
Energy-storage battery charge and discharge count constraint in node k direct-current grid are as follows:
Controllable burden constrains in node k direct-current grid are as follows:
Wherein, set u (j) is in AC distribution net using j as the headend node set of the branch of endpoint node, set v (j)
For the set of the endpoint node for the branch that AC distribution net j is headend node, Pij(t)、QijIt (t) is respectively t-th of scheduling slot
Branch ij head end active power and reactive power, Pj(t) and Qj(t) be respectively t-th of scheduling slot node j active power and
Reactive power injection value only, Iij(t) current amplitude for being t-th of scheduling slot branch ij, rijAnd xijThe respectively electricity of branch ij
Resistance and reactance, P0(t) active power of AC distribution net is flowed into from root node for t-th of scheduling slot,WithRespectively
The upper and lower bound for the active power that AC distribution net is exchanged with higher level's power grid,WithThe respectively upper voltage limit of node i
And lower limit,WithAC distribution net and node k direct-current grid respectively in multi-point dispersion formula distribution system are handed over
The maximum value and minimum value of power are changed,For the AC distribution net in t-th of scheduling slot multi-point dispersion formula distribution system
In the reactive power of electric power electric transformer that is connect with node k direct-current grid,For in multi-point dispersion formula distribution system with
The capacity of the AC distribution net electric power electric transformer of node k direct-current grid connection,For t-th of scheduling slot node k
The active power of photovoltaic generating system being actually sent out in direct-current grid,It is micro- for t-th of scheduling slot node k direct current
The active power of energy-storage battery charge and discharge, P in power gridkIt (t) is the load of t-th of scheduling slot node k direct-current grid,
The active power issued is predicted for photovoltaic generating system in t-th of scheduling slot node k direct-current grid,
For energy-storage battery maximum charge power (less than 0), maximum discharge power (being greater than 0), E in node k direct-current gridkIt (t) is t
The remaining electricity of energy-storage battery in a scheduling slot node k direct-current grid, Emax.kFor node k direct-current grid energy-storage battery
Capacity, SOC_lkAnd SOC_ukFor the minimum value and maximum value of energy-storage battery state-of-charge in node k direct-current grid, Ek(0)、
Ek(L) to start a dispatching cycle in node k direct-current grid, at the end of energy-storage battery electricity, ηB.k +、ηB.k -For node k
The discharging efficiency of energy-storage battery, charge efficiency in direct-current grid,It is energy-storage battery one day in node k direct-current grid
Within discharge general power, λkFor the maximum charge and discharge number of energy-storage battery in node k direct-current grid,It is micro- for node k direct current
Allow the size of reduction plans in power grid,For the practical load cut down of node k direct-current grid, μkFor node k direct current
The load of controllable burden in micro-capacitance sensor cuts down coefficient (0≤μk≤ 1) cutting for node k direct-current grid controllable burden, is embodied
Subtract degree；
(2) Optimized model for solving above-mentioned steps (1), obtains the dispatch command of each scheduling slot, and dispatch command includes each
The active power that exchanges with direct-current grid of AC distribution net of scheduling slot electric power electric transformer control instructs, power electronics
The DC low-voltage side voltage instruction of reactive power instruction, electric power electric transformer control that transformer is issued to AC distribution net,
The active power that photovoltaic generating system in direct-current grid issues instructs, energy-storage battery charge and discharge is active in direct-current grid
Controllable burden carries out the active power instruction of load reduction in power instruction and direct-current grid；
(3) matched according to the exchange of each scheduling slot electric power electric transformer control in the dispatch command of above-mentioned steps (2)
The DC low-voltage side voltage instruction, straight of the instruction of active power that power grid is exchanged with direct-current grid, electric power electric transformer control
Flow active power instruction that the photovoltaic generating system in micro-capacitance sensor issues, in direct-current grid energy-storage battery charge and discharge wattful power
Controllable burden carries out the active power instruction of load reduction in rate instruction and direct-current grid, carries out with dispatching:
The AC distribution net that electric power electric transformer in dispatch command controls is exchanged with node k direct-current grid active
Power instruction is judged, if the active power instruction that AC distribution net is exchanged with node k direct-current grid is minimum value, and is saved
The active power that photovoltaic generating system in point k direct-current grid is issued is sufficient, then enters control model 1, and adjustment connection is handed over
The electric power electric transformer DC voltage of power distribution network and node k direct-current grid is flowed, thus control node k direct-current grid
DC bus-bar voltage, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid
Are as follows:WhereinFor photovoltaic generating system in node k direct-current grid
Rated capacity makes to connect AC distribution net and node k direct current is micro- by the DC bus-bar voltage of detection node k direct-current grid
The electric power electric transformer of power grid enters limited current state, limiting AC power distribution network and exchanges with node k direct-current grid active
Power makesWhereinIndicate that node k direct-current grid is handed over by electric power electric transformer and AC distribution net
The active power changed,It is active to indicate that node k direct-current grid is exchanged by electric power electric transformer with AC distribution net
The minimum value of power makes the photovoltaic generating system in node k direct-current grid enter sagging control model, photovoltaic electric electricity generation system
Active power is issued, i.e.,The energy-storage battery charging made simultaneously, as far as possible absorption photovoltaic hair power generation
What system issued has active power, reduction of the controllable burden without load；If AC distribution net is exchanged with node k direct-current grid
Active power instruction be minimum value, and the active power that the photovoltaic generating system in node k direct-current grid is issued is relatively not
Foot then enters control model 2, the electric power electric transformer DC side electricity of adjustment connection AC distribution net and node k direct-current grid
Pressure, thus the DC bus-bar voltage of control node k direct-current grid, wherein connection AC distribution net and node k direct-current grid
Electric power electric transformer DC voltage value are as follows: And
The DC bus-bar voltage of detection node k direct-current grid makes the power electronics for connecting AC distribution net and node k direct-current grid
Transformer enters limited current state, and the active power of limiting AC power distribution network and the exchange of node k direct-current grid makesAnd the energy-storage battery in node k direct-current grid is made to enter sagging charge mode, energy-storage battery absorbs active
Power, i.e.,Photovoltaic generating system works in maximal power tracing state, utilizes renewable distribution
The energy, reduction of the controllable burden without load；If the active power instruction that AC distribution net is exchanged with node k direct-current grid
Between minimum value and maximum value, i.e.,Then enter control model 3, adjustment connection AC distribution net with
The electric power electric transformer DC voltage of node k direct-current grid, thus the DC bus electricity of control node k direct-current grid
Pressure, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:Pass through the straight of detection node k direct-current grid
Busbar voltage is flowed, the electric power electric transformer for connecting AC distribution net and node k direct-current grid is made to enter sagging control model,
The active power that electric power electric transformer control control AC distribution net is exchanged with node k direct-current grid, makesPhotovoltaic generating system in k-th of direct-current grid works in maximal power tracing state,
Energy-storage battery carries out charge and discharge, reduction of the controllable burden without load according to the active power shortage that DC bus reflects；If
The instruction of active power that AC distribution net is exchanged with node k direct-current grid is maximum value, and the light in node k direct-current grid
Photovoltaic generating system sends out issued active power wretched insufficiency, then enters control model 4, adjustment connection AC distribution net and node
The electric power electric transformer DC voltage of k direct-current grid, thus the DC bus electricity of control node k direct-current grid
Pressure, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:The DC bus-bar voltage of detection node k direct-current grid makes to connect AC distribution net and node k direct current is micro-
The electric power electric transformer of power grid enters limited current state, the active power of limiting AC power distribution network and direct-current grid exchange, i.e.,Energy-storage battery is set to enter sagging discharge mode, energy-storage battery issues active power,
I.e.Photovoltaic generating system work is controllably born in maximal power tracing state
Reduction of the lotus without load；If the active power instruction that AC distribution net is exchanged with node k direct-current grid is maximum value, and by
Photovoltaic in node k direct-current grid issues active power wretched insufficiency, and energy-storage battery electric discharge has reached maximum active power limitation
Or energy-storage battery reserve of electricity is insufficient, so that the active power that photovoltaic generating system and energy-storage battery electric discharge issue at this time is not
It is able to satisfy operation constraint.Then enter control model 5, the power electronics of adjustment connection AC distribution net and node k direct-current grid
Transformer dc side voltage, thus the DC bus-bar voltage of control node k direct-current grid, wherein connection AC distribution net and section
The electric power electric transformer DC voltage value of point k direct-current grid are as follows:
The DC bus-bar voltage of detection node k direct-current grid makes the controllable burden in node k direct-current grid carry out load reduction,
The active power of consumption is reduced, i.e.,Photovoltaic generating system works in maximal power tracing state,
Active power, AC distribution net and the node k direct-current grid that energy-storage battery is consumed according to load in node k direct-current grid are handed over
The difference for the active power that the active power and photovoltaic generating system changed issue is discharged.
Multi-point dispersion formula distribution system dispatching method proposed by the present invention based on electric power electric transformer, feature and excellent
Point is:
The method of the present invention realizes that the equity to each unit in direct-current grid controls using electric power electric transformer, while benefit
Real-time Power Flow control is carried out to AC distribution net with electric power electric transformer, realizes the tide optimization of AC distribution net.It is a kind of
Energy management is carried out to the multi-point dispersion formula system containing multiple direct-current grids and AC distribution net by electric power electric transformer
With the method for Optimized Operation.Multi-point dispersion formula distribution system Optimized model is initially set up, and it is optimized, friendship is calculated
Flow the dispatch command of each schedulable unit in power distribution network and direct-current micro-grid.Then according to optimization calculated result, power electronics is adjusted
As signal is controlled, the controllable in each direct-current grid determines respective transformer dc low-pressure side voltage according to voltage signal
Operating status, while utilize the adjustable characteristic of electric power electric transformer power factor, to AC distribution net carry out tide optimization.
To obtain the entirely multi-point dispersion formula distribution system Optimization Scheduling containing direct-current micro-grid and AC distribution net.
The method of the present invention carries out reciprocity control to each unit in direct-current micro-grid using electric power electric transformer, avoids principal and subordinate
Control, reduces the pressure of communication aspects, reduces equipment installation cost, enormously simplify answering for the control system of direct-current micro-grid
Polygamy.Electric power electric transformer carries out tide optimization to exchange micro-capacitance sensor simultaneously, reduces distribution network loss.
Detailed description of the invention
Fig. 1 is the multi-point dispersion formula distribution system dispatching method flow chart element proposed by the present invention based on electric power electric transformer
Figure.
Fig. 2 is the multi-point dispersion formula distribution system structural schematic diagram that the method for the present invention is related to.
Fig. 3 is to run control figure according to the direct-current grid of the method for the present invention.
Specific embodiment
Multi-point dispersion formula distribution system dispatching method proposed by the present invention based on electric power electric transformer, flow diagram
As shown in Figure 1, the structure of multi-point dispersion formula distribution system as shown in Fig. 2, method includes the following steps:
(1) optimal operation model of a multi-point dispersion formula distribution system is established, which includes a fortune
Row objective function is as follows:
Wherein, the direct current that will be connect by electric power electric transformer with AC distribution net in multi-point dispersion formula distribution system is micro-
Power grid is denoted as node k, and subscript k is node serial number, and n is AC distribution net node number, when L is the scheduling in a dispatching cycle
Number of segment, t are the serial number of scheduling slot, and Δ t is the duration of scheduling slot, and c is power purchase price,Respectively node k direct current
The operation unit price of photovoltaic generating system, energy-storage battery in micro-capacitance sensor,Respectively t-th of scheduling slot node k
The practical active power that photovoltaic generating system and energy-storage battery issue in direct-current grid,For t-th of scheduling slot multiple spot
Distributing distribution system interior joint k direct-current grid passes through the active power that electric power electric transformer is exchanged with AC distribution net,Indicate the practical active power cut down of controllable burden in t-th of scheduling slot node k direct-current grid,It is t-th
The unit compensation expense of load reduction, P are carried out in scheduling slot node k direct-current grid to controllable burdeniIt (t) is t-th of tune
Spend the load active power of period multi-point dispersion formula distribution system interior joint i, Ui(t)、UjIt (t) is respectively that t-th of scheduling slot is more
The voltage of point distributing distribution system interior joint i, node j, yijFor the admittance between node i, node j；
The constraint condition of optimal operation model includes:
Trend constraint are as follows:
The active power constraint that AC distribution net is exchanged with higher level's power grid are as follows:
The constraint of AC distribution net node voltage are as follows:
The active power constraint that AC distribution net is exchanged with direct-current grid are as follows:
The electric power electric transformer capacity-constrained of connection exchange micro-capacitance sensor and node k direct-current grid are as follows:
Node k direct-current grid power-balance constraint are as follows:
The power constraint of photovoltaic generating system in node k direct-current grid are as follows:
Energy-storage battery charge-discharge electric power constrains in node k direct-current grid are as follows:
The energy constraint that energy-storage battery remaining capacity need to meet in node k direct-current grid are as follows:
The electricity of energy-storage battery starts the constraint being consistent with finish time in dispatching cycle in node k direct-current grid
Are as follows:
Ek(L)=Ek(0)
The relationship that each moment remaining capacity of energy-storage battery and charge-discharge electric power meet in node k direct-current grid are as follows:
Energy-storage battery charge and discharge count constraint in node k direct-current grid are as follows:
Controllable burden constrains in node k direct-current grid are as follows:
Wherein, set u (j) is in AC distribution net using j as the headend node set of the branch of endpoint node, set v (j)
For the set of the endpoint node for the branch that AC distribution net j is headend node, Pij(t)、QijIt (t) is respectively t-th of scheduling slot
Branch ij head end active power and reactive power, Pj(t) and Qj(t) be respectively t-th of scheduling slot node j active power and
Reactive power injection value only, Iij(t) current amplitude for being t-th of scheduling slot branch ij, rijAnd xijThe respectively electricity of branch ij
Resistance and reactance, P0(t) active power of AC distribution net is flowed into from root node for t-th of scheduling slot,WithRespectively
The upper and lower bound for the active power that AC distribution net is exchanged with higher level's power grid,WithThe respectively upper voltage limit of node i
And lower limit,WithAC distribution net and node k direct-current grid respectively in multi-point dispersion formula distribution system are handed over
The maximum value and minimum value of power are changed,For the AC distribution net in t-th of scheduling slot multi-point dispersion formula distribution system
In the reactive power of electric power electric transformer that is connect with node k direct-current grid,For in multi-point dispersion formula distribution system with
The capacity of the AC distribution net electric power electric transformer of node k direct-current grid connection,For t-th of scheduling slot node k
The active power of photovoltaic generating system being actually sent out in direct-current grid,It is micro- for t-th of scheduling slot node k direct current
The active power of energy-storage battery charge and discharge, P in power gridkIt (t) is the load of t-th of scheduling slot node k direct-current grid,
The active power issued is predicted for photovoltaic generating system in t-th of scheduling slot node k direct-current grid,For
Energy-storage battery maximum charge power (less than 0), maximum discharge power (being greater than 0), E in node k direct-current gridk(t) it is t-th
The remaining electricity of energy-storage battery in scheduling slot node k direct-current grid, Emax.kFor the appearance of node k direct-current grid energy-storage battery
Amount, SOC_lkAnd SOC_ukFor the minimum value and maximum value of energy-storage battery state-of-charge in node k direct-current grid, Ek(0)、Ek
(L) to start a dispatching cycle in node k direct-current grid, at the end of energy-storage battery electricity, ηB.k +、ηB.k -It is straight for node k
The discharging efficiency of energy-storage battery, charge efficiency in micro-capacitance sensor are flowed,For energy-storage battery one day in node k direct-current grid it
Interior electric discharge general power, λkFor the maximum charge and discharge number of energy-storage battery in node k direct-current grid,For node k DC micro-electric
Allow the size of reduction plans in net,For the practical load cut down of node k direct-current grid, μkIt is micro- for node k direct current
The load of controllable burden in power grid cuts down coefficient (0≤μk≤ 1) reduction of node k direct-current grid controllable burden, is embodied
Degree；
(2) Optimized model for solving above-mentioned steps (1), obtains the dispatch command of each scheduling slot, and dispatch command includes each
The active power that exchanges with direct-current grid of AC distribution net of scheduling slot electric power electric transformer control instructs, power electronics
The DC low-voltage side voltage instruction of reactive power instruction, electric power electric transformer control that transformer is issued to AC distribution net,
The active power that photovoltaic generating system in direct-current grid issues instructs, energy-storage battery charge and discharge is active in direct-current grid
Controllable burden carries out the active power instruction of load reduction in power instruction and direct-current grid；
(3) matched according to the exchange of each scheduling slot electric power electric transformer control in the dispatch command of above-mentioned steps (2)
The DC low-voltage side voltage instruction, straight of the instruction of active power that power grid is exchanged with direct-current grid, electric power electric transformer control
Flow active power instruction that the photovoltaic generating system in micro-capacitance sensor issues, in direct-current grid energy-storage battery charge and discharge wattful power
Controllable burden carries out the active power instruction of load reduction in rate instruction and direct-current grid, carries out with dispatching, such as Fig. 3 institute
Show:
The AC distribution net that electric power electric transformer in dispatch command controls is exchanged with node k direct-current grid active
Power instruction is judged, if the active power instruction that AC distribution net is exchanged with node k direct-current grid is minimum value, and is saved
The active power that photovoltaic generating system in point k direct-current grid is issued is sufficient, then enters control model 1, and adjustment connection is handed over
The electric power electric transformer DC voltage of power distribution network and node k direct-current grid is flowed, thus control node k direct-current grid
DC bus-bar voltage, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid
Are as follows:WhereinFor photovoltaic generating system in node k direct-current grid
Rated capacity makes to connect AC distribution net and node k direct current is micro- by the DC bus-bar voltage of detection node k direct-current grid
The electric power electric transformer of power grid enters limited current state, limiting AC power distribution network and exchanges with node k direct-current grid active
Power makesWhereinIndicate that node k direct-current grid is handed over by electric power electric transformer and AC distribution net
The active power changed,It is active to indicate that node k direct-current grid is exchanged by electric power electric transformer with AC distribution net
The minimum value of power makes the photovoltaic generating system in node k direct-current grid enter sagging control model, photovoltaic electric electricity generation system hair
Active power out, i.e.,The energy-storage battery charging made simultaneously, as far as possible absorption photovoltaic hair power generation system
What system issued has active power, reduction of the controllable burden without load；If AC distribution net is exchanged with node k direct-current grid
Active power instruction is minimum value, and the active power relative deficiency that the photovoltaic generating system in node k direct-current grid is issued,
Then entering control model 2, adjustment connects the electric power electric transformer DC voltage of AC distribution net and node k direct-current grid,
To the DC bus-bar voltage of control node k direct-current grid, wherein the electricity of connection AC distribution net and node k direct-current grid
Power electronic transformer DC voltage value are as follows:
And the DC bus-bar voltage of detection node k direct-current grid, make the electric power electricity for connecting AC distribution net and node k direct-current grid
Sub- transformer enters limited current state, and the active power of limiting AC power distribution network and the exchange of node k direct-current grid makesAnd the energy-storage battery in node k direct-current grid is made to enter sagging charge mode, energy-storage battery absorbs active
Power, i.e.,Photovoltaic generating system works in maximal power tracing state, utilizes renewable distribution
The energy, reduction of the controllable burden without load；If the active power instruction that AC distribution net is exchanged with node k direct-current grid
Between minimum value and maximum value, i.e.,Then enter control model 3, adjustment connection AC distribution net with
The electric power electric transformer DC voltage of node k direct-current grid, thus the DC bus electricity of control node k direct-current grid
Pressure, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:Pass through the straight of detection node k direct-current grid
Busbar voltage is flowed, the electric power electric transformer for connecting AC distribution net and node k direct-current grid is made to enter sagging control model,
The active power that electric power electric transformer control control AC distribution net is exchanged with node k direct-current grid, makesPhotovoltaic generating system in k-th of direct-current grid works in maximal power tracing state,
Energy-storage battery carries out charge and discharge, reduction of the controllable burden without load according to the active power shortage that DC bus reflects；If
The instruction of active power that AC distribution net is exchanged with node k direct-current grid is maximum value, and the light in node k direct-current grid
Photovoltaic generating system sends out issued active power wretched insufficiency, then enters control model 4, adjustment connection AC distribution net and node
The electric power electric transformer DC voltage of k direct-current grid, thus the DC bus electricity of control node k direct-current grid
Pressure, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:The DC bus-bar voltage of detection node k direct-current grid makes to connect AC distribution net and node k is straight
The electric power electric transformer of stream micro-capacitance sensor enters limited current state, the wattful power of limiting AC power distribution network and direct-current grid exchange
Rate, i.e.,Energy-storage battery is set to enter sagging discharge mode, energy-storage battery issues active power,
I.e.Photovoltaic generating system work is controllably born in maximal power tracing state
Reduction of the lotus without load；If the active power instruction that AC distribution net is exchanged with node k direct-current grid is maximum value, and
Since the photovoltaic in node k direct-current grid issues active power wretched insufficiency, energy-storage battery electric discharge has reached maximum active power
Limitation or energy-storage battery reserve of electricity are insufficient, so that the active power that photovoltaic generating system and energy-storage battery electric discharge issue at this time is
It is not able to satisfy operation constraint.Then enter control model 5, the electric power of adjustment connection AC distribution net and node k direct-current grid
Electronic transformer DC voltage, thus the DC bus-bar voltage of control node k direct-current grid, wherein connection AC distribution net
With the electric power electric transformer DC voltage value of node k direct-current grid are as follows:
The DC bus-bar voltage of detection node k direct-current grid, makes node
Controllable burden in k direct-current grid carries out load reduction, reduces the active power of consumption, i.e.,
Photovoltaic generating system work has in maximal power tracing state, energy-storage battery according to what load in node k direct-current grid consumed
The active power that function power, the active power of AC distribution net and the exchange of node k direct-current grid and photovoltaic generating system issue
Difference discharge.
Claims (1)
1. a kind of multi-point dispersion formula distribution system dispatching method based on electric power electric transformer, which is characterized in that this method packet
Include following steps:
(1) optimal operation model of a multi-point dispersion formula distribution system is established, which includes an operation mesh
Scalar functions are as follows:
Wherein, the direct-current grid that will be connect by electric power electric transformer with AC distribution net in multi-point dispersion formula distribution system
It is denoted as node k, subscript k is node serial number, and n is AC distribution net node number, and L is the scheduling slot in a dispatching cycle
Number, t are the serial number of scheduling slot, and Δ t is the duration of scheduling slot, and c is power purchase price,Respectively node k direct current is micro-
The operation unit price of photovoltaic generating system, energy-storage battery in power grid,Respectively t-th of scheduling slot node k is straight
The practical active power that photovoltaic generating system and energy-storage battery issue in micro-capacitance sensor is flowed,For t-th of scheduling slot multiple spot point
It dissipates formula distribution system interior joint k direct-current grid and passes through the active power that electric power electric transformer is exchanged with AC distribution net,Indicate the practical active power cut down of controllable burden in t-th of scheduling slot node k direct-current grid,It is adjusted for t-th
It spends in period node k direct-current grid and carries out the unit compensation expense of load reduction, P to controllable burdeniIt (t) is t-th of scheduling
The load active power of period multi-point dispersion formula distribution system interior joint i, Ui(t)、UjIt (t) is respectively t-th of scheduling slot multiple spot
The voltage of distributing distribution system interior joint i, node j, yijFor the admittance between node i, node j；
The constraint condition of optimal operation model includes:
Trend constraint are as follows:
The active power constraint that AC distribution net is exchanged with higher level's power grid are as follows:
The constraint of AC distribution net node voltage are as follows:
The active power constraint that AC distribution net is exchanged with direct-current grid are as follows:
The electric power electric transformer capacity-constrained of connection exchange micro-capacitance sensor and node k direct-current grid are as follows:
Node k direct-current grid power-balance constraint are as follows:
The power constraint of photovoltaic generating system in node k direct-current grid are as follows:
Energy-storage battery charge-discharge electric power constrains in node k direct-current grid are as follows:
The energy constraint that energy-storage battery remaining capacity need to meet in node k direct-current grid are as follows:
The electricity of energy-storage battery starts the constraint being consistent with finish time in dispatching cycle in node k direct-current grid are as follows:
Ek(L)=Ek(0)
The relationship that each moment remaining capacity of energy-storage battery and charge-discharge electric power meet in node k direct-current grid are as follows:
Energy-storage battery charge and discharge count constraint in node k direct-current grid are as follows:
Controllable burden constrains in node k direct-current grid are as follows:
Wherein, set u (j) is using j as the headend node set of the branch of endpoint node in AC distribution net, and set v (j) is to hand over
Flow the set of the endpoint node for the branch that power distribution network j is headend node, Pij(t)、QijIt (t) is respectively t-th of scheduling slot branch
Ij head end active power and reactive power, Pj(t) and QjIt (t) is respectively the active power of t-th of scheduling slot node j and idle
Power injection value only, Iij(t) current amplitude for being t-th of scheduling slot branch ij, rijAnd xijRespectively the resistance of branch ij and
Reactance, P0(t) active power of AC distribution net is flowed into from root node for t-th of scheduling slot,WithRespectively exchange
The upper and lower bound for the active power that power distribution network is exchanged with higher level's power grid,WithRespectively the upper voltage limit of node i is under
Limit,WithAC distribution net respectively in multi-point dispersion formula distribution system exchanges function with node k direct-current grid
The maximum value and minimum value of rate,For in the AC distribution net in t-th of scheduling slot multi-point dispersion formula distribution system with section
The reactive power of the electric power electric transformer of point k direct-current grid connection,For in multi-point dispersion formula distribution system with node k
The capacity of the AC distribution net electric power electric transformer of direct-current grid connection,For t-th of scheduling slot node k direct current
The active power of photovoltaic generating system being actually sent out in micro-capacitance sensor,For t-th of scheduling slot node k direct-current grid
The active power of middle energy-storage battery charge and discharge, PkIt (t) is the load of t-th of scheduling slot node k direct-current grid,It is
The active power that photovoltaic generating system prediction issues in t scheduling slot node k direct-current grid,For node
Energy-storage battery maximum charge power, maximum discharge power, E in k direct-current gridkIt (t) is t-th of scheduling slot node k direct current
The remaining electricity of energy-storage battery, E in micro-capacitance sensormax.kFor the capacity of node k direct-current grid energy-storage battery, SOC_lkAnd SOC_uk
For the minimum value and maximum value of energy-storage battery state-of-charge in node k direct-current grid, Ek(0)、EkIt (L) is node k DC micro-electric
In net a dispatching cycle start, at the end of energy-storage battery electricity, ηB.k +、ηB.k -For energy-storage battery in node k direct-current grid
Discharging efficiency, charge efficiency,For general power of discharging within energy-storage battery one day in node k direct-current grid, λkFor section
The maximum charge and discharge number of energy-storage battery in point k direct-current grid,To allow reduction plans in node k direct-current grid
Size,For the practical load cut down of node k direct-current grid, μkFor the controllable burden in node k direct-current grid
Load cuts down coefficient, and the value that load cuts down coefficient is (0≤μk≤1)；
(2) Optimized model for solving above-mentioned steps (1), obtains the dispatch command of each scheduling slot, dispatch command includes each scheduling
The active power that exchanges with direct-current grid of AC distribution net of period electric power electric transformer control instructs, power electronics transformation
DC low-voltage side voltage instruction, the direct current of reactive power instruction, electric power electric transformer control that device is issued to AC distribution net
The active power of energy-storage battery charge and discharge in active power instruction that photovoltaic generating system in micro-capacitance sensor issues, direct-current grid
Controllable burden carries out the active power instruction of load reduction in instruction and direct-current grid；
(3) according to the AC distribution net of each scheduling slot electric power electric transformer control in the dispatch command of above-mentioned steps (2)
The active power exchanged with direct-current grid instructs, DC low-voltage side voltage instruction, the direct current of electric power electric transformer control are micro-
The active power that photovoltaic generating system in power grid issues instructs, the active power of energy-storage battery charge and discharge refers in direct-current grid
Controllable burden carries out the active power instruction of load reduction in order and direct-current grid, carries out with dispatching:
The active power that the AC distribution net that electric power electric transformer in dispatch command controls is exchanged with node k direct-current grid
Instruction judged, if the active power that exchange with node k direct-current grid of AC distribution net instructs as minimum value, and node k
The active power that photovoltaic generating system in direct-current grid is issued is sufficient, then enters control model 1, and adjustment connection exchange is matched
The electric power electric transformer DC voltage of power grid and node k direct-current grid, thus the direct current of control node k direct-current grid
Busbar voltage, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:WhereinIt is specified for photovoltaic generating system in node k direct-current grid
Capacity makes to connect AC distribution net and node k direct-current grid by the DC bus-bar voltage of detection node k direct-current grid
Electric power electric transformer enter limited current state, limiting AC power distribution network and the active power exchanged with node k direct-current grid,
MakeWhereinIndicate what node k direct-current grid was exchanged by electric power electric transformer with AC distribution net
Active power,Indicate that node k direct-current grid passes through the active power that electric power electric transformer is exchanged with AC distribution net
Minimum value, so that photovoltaic generating system in node k direct-current grid is entered sagging control model, photovoltaic electric electricity generation system issues
Active power, i.e.,The energy-storage battery charging made simultaneously, as far as possible absorption photovoltaic send out electricity generation system
What is issued has active power, reduction of the controllable burden without load；If AC distribution net has with what node k direct-current grid exchanged
Function power instruction is minimum value, and the active power relative deficiency that the photovoltaic generating system in node k direct-current grid is issued, then
Into control model 2, adjustment connects the electric power electric transformer DC voltage of AC distribution net and node k direct-current grid,
To the DC bus-bar voltage of control node k direct-current grid, wherein the electricity of connection AC distribution net and node k direct-current grid
Power electronic transformer DC voltage value are as follows:
And the DC bus-bar voltage of detection node k direct-current grid, make the electric power electricity for connecting AC distribution net and node k direct-current grid
Sub- transformer enters limited current state, and the active power of limiting AC power distribution network and the exchange of node k direct-current grid makesAnd the energy-storage battery in node k direct-current grid is made to enter sagging charge mode, energy-storage battery absorbs wattful power
Rate, i.e.,Photovoltaic generating system work utilizes renewable distributed energy in maximal power tracing state
Source, reduction of the controllable burden without load；If the active power instruction that AC distribution net is exchanged with node k direct-current grid exists
Between minimum value and maximum value, i.e.,Then enter control model 3, adjustment connection AC distribution net and section
The electric power electric transformer DC voltage of point k direct-current grid, thus the DC bus electricity of control node k direct-current grid
Pressure, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:
Pass through detection node k direct-current grid
DC bus-bar voltage makes the electric power electric transformer for connecting AC distribution net and node k direct-current grid enter sagging control mould
Formula, the active power that electric power electric transformer control control AC distribution net is exchanged with node k direct-current grid, makesPhotovoltaic generating system in k-th of direct-current grid works in maximal power tracing state,
Energy-storage battery carries out charge and discharge, reduction of the controllable burden without load according to the active power shortage that DC bus reflects；If
The instruction of active power that AC distribution net is exchanged with node k direct-current grid is maximum value, and the light in node k direct-current grid
Photovoltaic generating system sends out issued active power wretched insufficiency, then enters control model 4, adjustment connection AC distribution net and node
The electric power electric transformer DC voltage of k direct-current grid, thus the DC bus electricity of control node k direct-current grid
Pressure, wherein the electric power electric transformer DC voltage value of connection AC distribution net and node k direct-current grid are as follows:
The DC bus-bar voltage of detection node k direct-current grid makes to connect AC distribution net and section
The electric power electric transformer of point k direct-current grid enters limited current state, and what limiting AC power distribution network and direct-current grid exchanged has
Function power, i.e.,Energy-storage battery is set to enter sagging discharge mode, energy-storage battery issues active power,
I.e.Photovoltaic generating system work is controllably born in maximal power tracing state
Reduction of the lotus without load；If the active power instruction that AC distribution net is exchanged with node k direct-current grid is maximum value, and
Since the photovoltaic in node k direct-current grid issues active power wretched insufficiency, energy-storage battery electric discharge has reached maximum active power
Limitation or energy-storage battery reserve of electricity are insufficient, so that the active power that photovoltaic generating system and energy-storage battery electric discharge issue at this time is
It is not able to satisfy operation constraint.Then enter control model 5, the electric power of adjustment connection AC distribution net and node k direct-current grid
Electronic transformer DC voltage, thus the DC bus-bar voltage of control node k direct-current grid, wherein connection AC distribution net
With the electric power electric transformer DC voltage value of node k direct-current grid are as follows:
The DC bus-bar voltage of detection node k direct-current grid, envoy
Controllable burden in point k direct-current grid carries out load reduction, reduces the active power of consumption, i.e.,
Photovoltaic generating system work has in maximal power tracing state, energy-storage battery according to what load in node k direct-current grid consumed
The active power that function power, the active power of AC distribution net and the exchange of node k direct-current grid and photovoltaic generating system issue
Difference discharge.
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