CN108767891A - Feeder line photovoltaic is pressed to dissolve model in medium voltage distribution network single - Google Patents
Feeder line photovoltaic is pressed to dissolve model in medium voltage distribution network single Download PDFInfo
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- 238000004458 analytical method Methods 0.000 claims description 7
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
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- 241000196324 Embryophyta Species 0.000 description 4
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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
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- 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
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The purpose of the present invention is to provide pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single, the capacity that feeder line is pressed in photovoltaic generating system medium voltage distribution network single can be determined by algorithm after limiting specific constraints.In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：Feeder line photovoltaic is pressed to dissolve model in medium voltage distribution network single, mode of establishing is to seek the maximum distribution formula power supply installed capacity for pressing feeder line that can access in single under the premise of meeting node voltage and operation constraints, include the following steps：Obtain power-balance constraint, node voltage constraint, the constraint of substation bus bar voltage range, capacity of trunk constraint；Establish concrete model compared with prior art, the present invention is used heuristic algorithm, i.e., the position of a given photovoltaic generation and capacity, calculated voltage's distribiuting and system short-circuit electric current under various load levels, finally obtain maximum size by Construction of A Model.
Description
Technical field
The present invention relates to network technology, in particular to pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single.
Background technology
With the exploitation of new energy, the new energy such as wind-powered electricity generation photoelectricity are added gradually to networking.But due to photovoltaic system
Generated electricity activity of force it is protected from environmental and among constantly variation, be not stable power supply, power grid operating unit as
It is accessed by the power grid of refusal photovoltaic system, not only forms huge energy waste in this way, also entire photovoltaic industry is caused
The economic loss that can not be retrieved.And to reduce light rate of abandoning, on the one hand need national policy as guiding, be on the other hand also required to from
Distribution angle carries out consumption analysis.The patent of invention of Patent No. 201510290477.2 in the prior art《A kind of power distribution network
The method and system that photovoltaic digestion capability calculates》In disclose a kind of method that power distribution network photovoltaic digestion capability calculates, the party
Method includes：Obtain the required distribution network parameters of Load flow calculation, intensity of illumination, environment temperature and wind speed information；Utilize class Gauss
Sampling chooses at least one random scene；According to the distribution network parameters, intensity of illumination, environment temperature and wind speed information, lead to
New Year sequential power flow algorithm, calculates each node voltage amplitude of power distribution network in each random scene；In the voltage magnitude
Photovoltaic digestion capability of the photovoltaic maximum installed capacity as power distribution network for meeting voltage security restriction range is determined in set.The Shen
Middle random scene please be chosen using class Gauss sampling, calculate each node year time-sequential voltage amplitude of power distribution network in each random scene
Sequence therefrom chooses photovoltaic digestion capability of the photovoltaic maximum installed capacity of the voltage magnitude for the condition that meets as power distribution network,
Under the premise of the accuracy for ensuring result of calculation, while reducing calculation scale and improving computational efficiency.
But for actual regional application, the accuracy of consumption is more concerned in calculating process, to calculating
The requirement of scale and efficiency is not high.Scheme recorded in documents is caused to be not particularly suited for pressing in feeder line in single in this way
Calculating.
Invention content
The purpose of the present invention is to provide pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single, can limit specifically
The capacity that feeder line is pressed in photovoltaic generating system medium voltage distribution network single is determined by algorithm after constraints.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：In medium voltage distribution network single
It is to be born under the premise of meeting node voltage and operation constraints by measuring to press feeder line photovoltaic consumption model, mode of establishing
The distribution situation of lotus fluctuation, honourable resource situation, load and distributed generation resource in feeder line is sought pressing feeder line that can connect in single
The maximum distribution formula power supply installed capacity entered, includes the following steps：Obtain power-balance constraint, node voltage constraint, substation
Busbar voltage range constraint, capacity of trunk constraint；Establish concrete model：
Vi min≤Vi≤Vi max (4)
In formula, NDGRefer to the total N, P of distributed generation resourcegi、QgiTo inject the active power and reactive power of node i,
QliFor the reactive power of node i load, pij、qijFor the circuit active power and reactive power of connecting node i and j, ΩiIt represents
The node set being connected with node i.Vi、Vi minAnd Vi maxThe respectively voltage value of node i, minimum allowable value and maximum permissible value；
Vbus,i minWith Vbus,i maxRespectively substation bus bar i voltages minimum allowable value and maximum permissible value, Vbus,iFor substation bus bar i
Voltage value； pij maxFor the circuit maximum active power permissible value of connecting node i and j.
Preferably, the power-balance constraint is realized by the step：
1) method of operation for selecting accessed operation of power networks situation the most severe carries out steady-state analysis；
2) photovoltaic plant is set as the PQ nodes that idle output is zero；
3) using load tap changer and switching reactive compensator as regulation measure, the photovoltaic for making capacity be stepped up
Power station meets the steady-state operation requirement of system, and thereby determines that out photovoltaic plant peak power output；One known power distribution network
Network considers its Voltage Regulation Constraints, and the infiltration power of photovoltaic generation will be there are one maximum value, and here it is penetrating levels.
Preferably, regulation setting of the node voltage binding occurrence according to national standard and local power department, ranging from 0.93-
1.07p.u.。
Preferably, capacity of trunk constraint, to ensure that circuit long-term safety is reliably run, access line current-carrying capacity and
Smaller constrains as capacity of trunk in the maximum load current that route protection allows.
Preferably, the substation bus bar voltage range constraint is from the point of view of reactive power/voltage control, due to substation
The reactive power compensator of low-pressure side adjusts busbar voltage using the method for grouping switching, and the one kind recorded by formula (5) is discrete
Control method, while considering the certain operating lag of reactive power compensator, substation low-voltage side busbar voltage is in a certain range
Fluctuation.
Preferably, in DC component, when the specified operation of inverter type distributed generation resource, the DC current that is fed to power grid
The 0.5% of its exchange definite value is not to be exceeded in component.
PQ nodes are that injection active and reactive power gives constant node, generally select load bus and no adjustment capability
Power generation node.Compared with prior art, it is an advantage of the invention that：By Construction of A Model, use heuristic algorithm, i.e., given one
The position of a photovoltaic generation and capacity calculate voltage's distribiuting and system short-circuit electric current under various load levels, if voltage point
Cloth and short circuit current level meet the requirement of safe operation, are further added by the capacity of photovoltaic generation, above-mentioned calculating are repeated, until photovoltaic
Until power generation capacity cannot be further added by.This method uses traditional tune completely for a completely passive distribution system
Pressure means carry out the distribution system of pressure regulation more effectively and conveniently.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the radiant type electricity distribution network model schematic diagram for being connected to distributed photovoltaic.
Specific implementation mode
Feeder line photovoltaic is pressed to dissolve model in medium voltage distribution network single of the present invention, mode of establishing is to meet node voltage and fortune
Under the premise of row constraints, by measuring point of load fluctuation, honourable resource situation, load and distributed generation resource in feeder line
Cloth situation is sought the maximum distribution formula power supply installed capacity for pressing feeder line that can access in single, is included the following steps：Obtain power
Constraints of Equilibrium, node voltage constraint, the constraint of substation bus bar voltage range, capacity of trunk constraint；Establish concrete model：
Vi min≤Vi≤Vi max (4)
In formula, NDGRefer to the total N, P of distributed generation resourcegi、QgiTo inject the active power and reactive power of node i,
QliFor the reactive power of node i load, pij、qijFor the circuit active power and reactive power of connecting node i and j, ΩiIt represents
The node set being connected with node i.Vi、Vi minAnd Vi maxThe respectively voltage value of node i, minimum allowable value and maximum permissible value；
Vbus,i minWith Vbus,i maxRespectively substation bus bar i voltages minimum allowable value and maximum permissible value, Vbus,iFor substation bus bar i
Voltage value； pij maxFor the circuit maximum active power permissible value of connecting node i and j.
The wherein described power-balance constraint is realized by the step：
1) method of operation for selecting accessed operation of power networks situation the most severe carries out steady-state analysis；
2) photovoltaic plant is set as the PQ nodes that idle output is zero；PQ nodes are known node injection active-power Ps
With the node of reactive power Q.
3) using load tap changer and switching reactive compensator as regulation measure, the photovoltaic for making capacity be stepped up
Power station meets the steady-state operation requirement of system, and thereby determines that out photovoltaic plant peak power output；One known power distribution network
Network considers its Voltage Regulation Constraints, and the infiltration power of photovoltaic generation will be there are one maximum value, and here it is penetrating levels.
Regulation setting of the node voltage binding occurrence according to national standard and local power department, ranging from 0.93-
1.07p.u.。
Pressure feeder line photovoltaic dissolves model in medium voltage distribution network single as described in claim 1, it is characterised in that：It is described
Capacity of trunk constrains, to ensure that circuit long-term safety is reliably run, the maximum of access line current-carrying capacity and route protection permission
Smaller constrains as capacity of trunk in load current.：The substation bus bar voltage range is constrained from reactive power/voltage control
Angle considers, since the reactive power compensator of substation low-voltage side adjusts busbar voltage using the method for grouping switching, passes through public affairs
A kind of Discrete Control Method that formula (5) is recorded, while considering the certain operating lag of reactive power compensator, substation low-voltage side
Busbar voltage fluctuates in a certain range.In DC component, when the specified operation of inverter type distributed generation resource, presented to power grid
The 0.5% of its exchange definite value is not to be exceeded in the direct-current component sent.
As shown in Figure 1, setting certain radiating tracks shares N number of node, each node is connected to load and distributed photovoltaic
Its power is set as zero by power supply if photo-voltaic power supply or load is not present in certain node.In figure, No. 0 node on behalf matches the goddess of lightning
Line, PVBUSFor by the photovoltaic of access via telephone line substation low-voltage side busbar, (Rk, Xk) represents the equivalent impedance of kth section feeder line,
(PL.k+jQL.k) load power of k-th of node is represented, PPV.k represents the photovoltaic power on k-th of node., it is worthwhile to note that
The effective power flow of photovoltaic is opposite with the effective power flow direction of load.Feeder line is pressed in power distribution network, k-th of node is at distribution bus
The loss of voltage and kth branch current (ignoring network loss influence) are as follows：
The main reason for causing photovoltaic access node overvoltage it can be seen from formula (7) is defeated for the resistance and photovoltaic of circuit
Go out the product of power.The formula can provide theoretical foundation to propose to reduce the measure that photovoltaic access influences distribution network voltage.
220V single phase power supply voltage deviations are+the 7% of nominal voltage, -10%.
It is smaller to supply terminals capacity of short circuit, power supply distance is longer and has the user of particular/special requirement to supply voltage deviation,
By supplying, electricity consumption bilateral agreement determines.
It is not to be exceeded 2% in the negative sequence voltage degree of unbalancedness of voltage unbalance factor, points of common connection, is no more than 4% in short-term；
Wherein the negative sequence voltage degree of unbalancedness caused by each distributed generation resource is not to be exceeded 1.3%, is no more than 2.6% in short-term.
Press in medium voltage distribution network single of the present invention feeder line photovoltaic consumption model that can utilize electric power electric analysis, electric energy management
Comprehensive Analysis Software system (ETAP) carries out simulation calculation.Simulation analysis is first to be completed in terms of the photovoltaic system that puts into operation carries out
It calculates, to press feeder line photovoltaic limit ability to bear in analysis medium voltage distribution network single, it will further be assumed that its institute band user all pacifies
Dress roof photovoltaic and each household installation bigger photovoltaic installed capacity come carry out trend, short circuit current, power quality, reactive balance,
The calculating of relay protection etc. is analyzed, and reference frame is provided for the control of the circuit photovoltaic access capacity from now on.
Above is only a specific embodiment of the present invention, but the structure feature of the present invention is not limited thereto, Ren Heben
The technical staff in field in the field of the invention, made by changes or modifications all cover the present invention the scope of the claims among.
Claims (6)
1. pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single, mode of establishing is to meet node voltage and operation constraint item
Under the premise of part, by measuring the distribution situation of load fluctuation, honourable resource situation, load and distributed generation resource in feeder line,
Seek the maximum distribution formula power supply installed capacity for pressing feeder line that can access in single, it is characterised in that：Include the following steps：It obtains
Power-balance constraint, node voltage constraint, the constraint of substation bus bar voltage range, capacity of trunk constraint；Establish concrete model：
In formula, NDGRefer to the total N, P of distributed generation resourcegi、QgiTo inject the active power and reactive power of node i, QliFor
The reactive power of node i load, pij、qijFor the circuit active power and reactive power of connecting node i and j, ΩiRepresentative and node
Node set connected i.Vi、Vi minAnd Vi maxThe respectively voltage value of node i, minimum allowable value and maximum permissible value；Vbus,i min
With Vbus,i maxRespectively substation bus bar i voltages minimum allowable value and maximum permissible value, Vbus,iFor the voltage of substation bus bar i
Value；pij maxFor the circuit maximum active power permissible value of connecting node i and j.
2. pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single as described in claim 1, it is characterised in that：The power
Constraints of Equilibrium is realized by the step：
1) method of operation for selecting accessed operation of power networks situation the most severe carries out steady-state analysis；
2) photovoltaic plant is set as the PQ nodes that idle output is zero；
3) using load tap changer and switching reactive compensator as regulation measure, the photovoltaic plant for making capacity be stepped up
Meet the steady-state operation requirement of system, and thereby determines that out photovoltaic plant peak power output；One known distribution network, is examined
Consider its Voltage Regulation Constraints, the infiltration power of photovoltaic generation will be there are one maximum value, and here it is penetrating levels.
3. pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single as described in claim 1, it is characterised in that：Node voltage
Regulation setting of the binding occurrence according to national standard and local power department, ranging from 0.93-1.07p.u..
4. pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single as described in claim 1, it is characterised in that：The circuit
Capacity-constrained, to ensure that circuit long-term safety is reliably run, the peak load of access line current-carrying capacity and route protection permission
Smaller constrains as capacity of trunk in electric current.
5. pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single as described in claim 1, it is characterised in that：The power transformation
Busbar voltage of standing range constraint is from the point of view of reactive power/voltage control, since the reactive power compensator of substation low-voltage side uses
The method of grouping switching adjusts busbar voltage, a kind of Discrete Control Method recorded by formula (5), while considering reactive-load compensation
The certain operating lag of device, substation low-voltage side busbar voltage fluctuate in a certain range.
6. pressing feeder line photovoltaic to dissolve model in medium voltage distribution network single as described in claim 1, it is characterised in that：In direct current point
Amount, when the specified operation of inverter type distributed generation resource, the direct-current component that is fed to power grid is not to be exceeded its and exchanges definite value
0.5%.
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| CN110034565A (en) * | 2019-05-10 | 2019-07-19 | 武汉大学 | A kind of distribution feeder load real-time control method based on synchronous vector information |
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| CN110979105A (en) * | 2019-12-24 | 2020-04-10 | 中铁二院工程集团有限责任公司 | Design method for external power supply access scheme of through bilateral traction power supply system |
| CN113067367A (en) * | 2020-12-21 | 2021-07-02 | 华能国际电力股份有限公司上海石洞口第一电厂 | Method, system, device and medium for protecting reverse power of steam turbine combined tripping generator |
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| CN110034565B (en) * | 2019-05-10 | 2022-11-29 | 武汉大学 | Power distribution network feeder load real-time control method based on synchronous vector information |
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| CN110979105A (en) * | 2019-12-24 | 2020-04-10 | 中铁二院工程集团有限责任公司 | Design method for external power supply access scheme of through bilateral traction power supply system |
| CN110979105B (en) * | 2019-12-24 | 2022-06-14 | 中铁二院工程集团有限责任公司 | Design method for external power supply access scheme of through bilateral traction power supply system |
| CN113067367A (en) * | 2020-12-21 | 2021-07-02 | 华能国际电力股份有限公司上海石洞口第一电厂 | Method, system, device and medium for protecting reverse power of steam turbine combined tripping generator |
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Application publication date: 20181106 |