CN105896577A  Energy storage power generation system useful for adjusting idle work  Google Patents
Energy storage power generation system useful for adjusting idle work Download PDFInfo
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 CN105896577A CN105896577A CN201610349014.3A CN201610349014A CN105896577A CN 105896577 A CN105896577 A CN 105896577A CN 201610349014 A CN201610349014 A CN 201610349014A CN 105896577 A CN105896577 A CN 105896577A
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Classifications

 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
 H02J3/28—Arrangements for balancing of the load in a network by storage of energy

 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
 H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
 H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power

 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
 H02J3/28—Arrangements for balancing of the load in a network by storage of energy
 H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means

 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
 H02J3/381—Dispersed generators
 H02J3/382—Dispersed generators the generators exploiting renewable energy

 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
 H02J3/381—Dispersed generators
 H02J3/382—Dispersed generators the generators exploiting renewable energy
 H02J3/386—Wind energy

 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 outofphase 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]

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
 Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
 Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
 Y02E10/00—Energy generation through renewable energy sources
 Y02E10/70—Wind energy
 Y02E10/76—Power conversion electric or electronic aspects

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
 Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
 Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
 Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
 Y02E40/10—Flexible AC transmission systems [FACTS]

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
 Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
 Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
 Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
 Y02E40/30—Reactive power compensation
Abstract
The invention discloses an energy storage power generation system useful for adjusting idle work. By monitoring a power generation device, a load unit, an energy storage device and SVG equipment together, the energy storage power generation system can store the power fluctuating value of the energy storage power generation system in time and dynamically adjusts the power of the energy storage device by taking the system as an information source, so that smooth gridconnected point power is realized, and economical operation of the energy storage power generation system is improved.
Description
Art
The present invention relates to a kind of can be used for and regulates idle energystoring and powergenerating system.
Background technology
Along with increasing and the propelling of developing country's process of industrialization of earth population, various fossil energies are rapid
Exhaustion, and atmospheric pollution and Ecological Environment Crisis that fossil energy causes during using are the most serious.For
Reduce atmospheric pollution, the supply steady in a longterm of the energy of preserving the ecological environment, ensure, be altered in steps existing
Energy resource structure, greatly developing green energy resource has become the common recognition of various countries.
Along with the maturation of the renewable energy power generation technology such as windpower electricity generation, photovoltaic generation, waveactivated power generation, more come
The most regenerative resource energystoring and powergenerating system form in a distributed manner accesses electrical network, meet the daily production of people,
The demand of household electricity.
Microgrid system smooths and site power swing often through configuration energystorage battery, improves electrical network to micro
The receiving ability of net system.In light storage microgrid system, a part of capacity of energystorage battery is used as the appearance of emergency service
Amount, another part capacity is for the smooth and power swing of site.
Along with windpowered electricity generation largescale grid connection, its power swing is more and more prominent to the impact of electrical network.And energystorage system
The feature the most quickly absorbing and releasing energy having, it is possible to effectively make up wind power output power intermittent,
The shortcoming of undulatory property, therefore configures energystorage system in wind powergenerating gridconnected system and has become as that to stabilize windpowered electricity generation defeated
One of effective means going out power swing.
Owing to energystorage system is relatively costly, how to select the maximum economic use value playing energystorage system, with
Shi Tigao energystorage system service life, become windpowered electricity generation and run the problem that enterprise is badly in need of considering.Mixed energy storage system
The ripple components of special frequency channel a certain in Power Output for Wind Power Field can be compensated, thus realize windpowered electricity generation merit
Rate fluctuation is stabilized.Energy storage setting power is divided into frequent fluctuation part and smooth, respectively by super capacitor
Undertake with energystorage battery, it is possible to achieve to the quick response stabilizing demand.
In order to optimize the operational efficiency of microgrid and for distribution quality, it is the most best that microgrid incorporates external electrical network
Selection, it can maintain local power optimization and balance, reduce system run manual dispatching difficulty.
But, the generator unit in microgrid and load cell are only monitored by prior art, not to energystorage system
Effectively monitor, it is impossible to the batteryoperated state in regulation energystorage system in time, easily cause microgrid with outer
The also site power swing of portion's electrical network is relatively big, and the unstable safety and reliability to distribution of power supply brings bad
Impact.
Summary of the invention
The present invention provides a kind of can be used for regulate idle energystoring and powergenerating system, and this energystoring and powergenerating system can pass through
TRT, load unit, energy storage device and SVG equipment are monitored in the lump, timely energystoring and powergenerating system merit
Rate undulating value, and the power of energy storage device is dynamically regulated as information source, thus realize smooth and site merit
Rate, improves energystoring and powergenerating system economical operation.
To achieve these goals, the present invention provides a kind of can be used for regulate idle energystoring and powergenerating system, should
Energystoring and powergenerating system includes:
TRT, for being converted into electric energy by green energy resource；
Load in energystoring and powergenerating system；
Energy storage device, is used for storing energy, and when can electricity generation system be incorporated into the power networks, output；
SVG equipment, for providing reactive power for energystoring and powergenerating system；
AC/DC bus, for realizing TRT in electricity generation system, energy storage device, energy storing and electricity generating system
Power Exchange between loading in system；
Gridconnecting apparatus, for realizing the Power Exchange between energystoring and powergenerating system and bulk power grid；
And supervising device；
This supervising device includes:
TRT monitoring module, monitors TRT, and enters the generated output of TRT in real time
Row prediction；
Parallel control module, for monitoring site ac bus voltage, and is used for controlling energystoring and powergenerating system
It is incorporated into the power networks via gridconnecting apparatus；
Energy storage device monitoring module, for the power attenuation situation of monitoring energy storage device in real time；
Load monitoring module, the load in monitoring energystoring and powergenerating system in real time；
SVG monitoring module, for monitoring SVG equipment in real time；
Middle control module, for determining the operation method of energystoring and powergenerating system, and each in abovementioned supervising device
Module sends instruction, to perform this operation method；
Communication bus, for the liaison of the modules of this supervising device.
Preferably, described energy storage device include first kind bidirectional power converter, first kind energy storage device,
Two class bidirectional power converters and Equations of The Second Kind energy storage device；
First kind bidirectional power converter, for obtaining the parameter of the physical parameter on described AC/DC bus
Value, and when described parameter value changes, change first according to the rate of change of default charge/discharge rates
Class energy storage device carries out charge/discharge rates during discharge and recharge；Until the parameter value of described physical parameter is equal to first
Parameter value or equal to the second parameter value time, first kind energy storage device is carried out charge/discharge rates during discharge and recharge
No longer change；
Equations of The Second Kind bidirectional power converter, for obtaining the parameter value of described physical parameter, and in described parameter
When value arrives the boundary value of preset range, Equations of The Second Kind energy storage device is carried out discharge and recharge so that described parameter value
Maintain the boundary value of preset range, described first parameter value and described second parameter value and be respectively positioned on described presetting
In the range of.
Preferably, according to the rate of change change of default charge/discharge rates, first kind energy storage device is carried out charge and discharge
Charge/discharge rates during electricity includes two kinds of situations, and the first situation is: according to the change of default charging rate
Rate changes charging rate when being charged first kind energy storage device；The second situation is: according to default
The rate of change of the velocity of discharge changes velocity of discharge when discharging first kind energy storage device.
Preferably, the energy density of first kind energy storage device is higher than the energy density of Equations of The Second Kind energy storage device.?
In reality, first kind energy storage device can be accumulator, and Equations of The Second Kind energy storage device can be super capacitor or fly
Wheel battery.
Preferably, described TRT monitoring module obtains the service data of TRT in real time, and stores number
According to.
Preferably, described TRT monitoring module, TRT stator leakage reactance can be obtained, TRT turns
Subleakage reactance, TRT excitation leakage reactance, TRT stator resistance, generating unit rotor resistance, by sending out
Electric installation parameter, builds TRT mathematical model, does earlystage preparations for computed losses, and obtains energy storage
The internal each several part physical parameter of electricity generation system, builds the topological model of whole energystoring and powergenerating system.
Preferably, the data acquisition frequency of TRT monitoring module, SVG monitoring module and load monitoring module
Within rate is 10s60s, screens extracting data, reject and shut down or there are fault TRT data,
Middle control module utilizes real time data, sets up energystoring and powergenerating system regulationcontrol model, power collection generator phase voltage,
TRT phase current, TRT active power, TRT reactive power, reactiveload compensation equipment power,
After retaining valid data, enter the hind computation stage.
Preferably, this energystoring and powergenerating system carries out imaginary power automatic compensation in the following way:
By TRT monitoring module, obtain TRT running status, wattful power in energystoring and powergenerating system
Rate value, the energy storage device real time data of energystoring and powergenerating system, extract data and go forward side by side row filter, reject shut down or
There are fault TRT data；Based on real time data, set up energystoring and powergenerating system reactive power and voltage control
Model；The energystoring and powergenerating system gridconnected point voltage instruction that parallel control module is assigned according to dispatching patcher, if on
Level system does not assign instruction, then by the given instruction of middle control module；Choosing is changed with the time scale of reactive power
Select two kinds of control models；
If idle change yardstick changes with minute/hour level time scale, TRT control mode is converted to
Constant active power controller, with energystoring and powergenerating system economical operation for controlling target, sets up object function, will
Fetched data substitutes in model, carries out TRT without the distribution of work；
Solve object function, obtain TRT Reactivepower control value；According to also site realtime voltage, design pipe
Reason flow process, is divided into five grades by the voltage in adjustable extent, the corresponding different Reactivepower control amount of each grade,
According to the running status that each TRT is different, the reactive power value obtained is assigned to the generating dress of correspondence
Put；
If idle change yardstick is with millisecond/second level time scale change, TRT operational mode is switched to perseverance
Determine voltage control mode；With suppression voltage pulsation as target, set up object function, fetched data is substituted into
In model, carry out TRT without the distribution of work；
In energystoring and powergenerating system, each unit receives Reactive power control instruction, completes to refer to according to self corresponding situation
Order, after performing instruction, feeds back to dispatching patcher by response value and gridconnected point voltage.
The energystoring and powergenerating system of the present invention have the advantage that (1) can by TRT, load unit,
Energy storage device and SVG equipment are monitored in the lump, timely energystoring and powergenerating system power swing value, and as information
Source dynamically regulates the power of energy storage device, thus realizes smooth and site power；(2) energy storing and electricity generating system is realized
The economical operation of system, and suppression voltage pulsation, by the collection to energystoring and powergenerating system data, set up net
Network framework model, under power limitation control strategy, it is ensured that TRT power factor is constant, by idle tune
Control economical operation.
Accompanying drawing explanation
Fig. 1 shows a kind of block diagram that can be used for regulating idle energystoring and powergenerating system of the present invention；
Fig. 2 shows the operation method of the energystoring and powergenerating system of a kind of present invention.
Detailed description of the invention
Fig. 1 shows a kind of can be used for of the present invention and regulates idle energystoring and powergenerating system 10, and this energy storage is sent out
Electricity system includes: TRT 12, for green energy resource is converted into electric energy；This TRT is preferably wind
Power generator group；Load 14 in energystoring and powergenerating system；Energy storage device 15, is used for storing energy, and can send out
When electricity system is incorporated into the power networks, output；SVG equipment 13, for providing for energystoring and powergenerating system 10
Reactive power；AC/DC bus, for realizing TRT in electricity generation system, energy storage device, energy storage
Power Exchange 16 between loading in electricity generation system；Gridconnecting apparatus 17, is used for realizing energystoring and powergenerating system 10
And the Power Exchange 20 between bulk power grid；With supervising device 11.
This supervising device 11 includes:
TRT monitoring module 113, for monitoring TRT 12 in real time, and sending out TRT 12
Electrical power is predicted；
Parallel control module 112, for monitoring site ac bus voltage, and is used for controlling energy storing and electricity generating system
System 10 is incorporated into the power networks via gridconnecting apparatus 17；
Energy storage device monitoring module 117, for the power attenuation situation of monitoring energy storage device 15 in real time；
Load monitoring module 114, the load 14 in monitoring energystoring and powergenerating system in real time；
SVG monitoring module 115, for monitoring SVG equipment 13 in real time；
Middle control module 116, for determining the operation method of energystoring and powergenerating system, and in abovementioned supervising device
Each module sends instruction, to perform this operation method；
Communication bus 111, for the liaison of the modules of this supervising device.
Preferably, described energy storage device 15 include first kind bidirectional power converter, first kind energy storage device,
Equations of The Second Kind bidirectional power converter and Equations of The Second Kind energy storage device；
First kind bidirectional power converter, for obtaining the parameter of the physical parameter on described AC/DC bus
Value, and when described parameter value changes, change first according to the rate of change of default charge/discharge rates
Class energy storage device carries out charge/discharge rates during discharge and recharge；Until the parameter value of described physical parameter is equal to first
Parameter value or equal to the second parameter value time, first kind energy storage device is carried out charge/discharge rates during discharge and recharge
No longer change；
Equations of The Second Kind bidirectional power converter, for obtaining the parameter value of described physical parameter, and in described parameter
When value arrives the boundary value of preset range, Equations of The Second Kind energy storage device is carried out discharge and recharge so that described parameter value
Maintain the boundary value of preset range, described first parameter value and described second parameter value and be respectively positioned on described presetting
In the range of.
Preferably, according to the rate of change change of default charge/discharge rates, first kind energy storage device is carried out charge and discharge
Charge/discharge rates during electricity includes two kinds of situations, and the first situation is: according to the change of default charging rate
Rate changes charging rate when being charged first kind energy storage device；The second situation is: according to default
The rate of change of the velocity of discharge changes velocity of discharge when discharging first kind energy storage device.
Preferably, the energy density of first kind energy storage device is higher than the energy density of Equations of The Second Kind energy storage device.?
In reality, first kind energy storage device can be accumulator, and Equations of The Second Kind energy storage device can be super capacitor or fly
Wheel battery.
Preferably, the service data of the described TRT monitoring realtime acquisition TRT 12 of mould 113 pieces, and
Storage data.
Preferably, described TRT monitoring module 113, TRT stator leakage reactance, TRT can be obtained
Rotor leakage reactance, TRT excitation leakage reactance, TRT stator resistance, generating unit rotor resistance, pass through
TRT parameter, builds TRT mathematical model, does earlystage preparations for computed losses, and obtains storage
The internal each several part physical parameter of energy electricity generation system, builds the topological model of whole energystoring and powergenerating system.
TRT monitoring module 113, SVG monitoring module 115 and the data acquisition of load monitoring module 114
Within frequency is 10s60s, screens extracting data, reject and shut down or there are fault TRT data,
Middle control module utilizes real time data, sets up energystoring and powergenerating system regulationcontrol model, power collection generator phase voltage,
TRT phase current, TRT active power, TRT reactive power, reactiveload compensation equipment power,
After retaining valid data, enter the hind computation stage.
Preferably, this energystoring and powergenerating system 10 carries out imaginary power automatic compensation in the following way:
By TRT monitoring module, obtain TRT running status, wattful power in energystoring and powergenerating system
Rate value, the real time data of energy storage device of energystoring and powergenerating system, extract data and go forward side by side row filter, reject and shut down
Or there are fault TRT data；Based on real time data, set up energystoring and powergenerating system reactive Voltage Optimum control
Simulation；The energystoring and powergenerating system gridconnected point voltage instruction that parallel control module is assigned according to dispatching patcher, if
Superior system does not assign instruction, then by the given instruction of middle control module；Change with the time scale of reactive power
Select two kinds of control models；
If idle change yardstick changes with minute/hour level time scale, TRT control mode is converted to
Constant active power controller, with energystoring and powergenerating system economical operation for controlling target, sets up object function, will
Fetched data substitutes in model, carries out TRT without the distribution of work；
Solve object function, obtain TRT Reactivepower control value；According to also site realtime voltage, design pipe
Reason flow process, is divided into five grades by the voltage in adjustable extent, the corresponding different Reactivepower control amount of each grade,
According to the running status that each TRT is different, the reactive power value obtained is assigned to the generating dress of correspondence
Put；
If idle change yardstick is with millisecond/second level time scale change, TRT operational mode is switched to perseverance
Determine voltage control mode；With suppression voltage pulsation as target, set up object function, fetched data is substituted into
In model, carry out TRT without the distribution of work；
In energystoring and powergenerating system, each unit receives Reactive power control instruction, completes to refer to according to self corresponding situation
Order, after performing instruction, feeds back to dispatching patcher by response value and gridconnected point voltage.
Seeing accompanying drawing 2, the operation method of the energystoring and powergenerating system of the present invention comprises the steps:
S1. TRT monitoring module obtains TRT service data in real time, and stores data, obtains in real time
Load power demand situation in energystoring and powergenerating system, obtains the power attenuation situation of energy storage device in real time；
S2. according to load power demand situation, energy storage device in TRT service data, energystoring and powergenerating system
Power attenuation situation, be predicted the TRT output in following predetermined instant is meritorious and idle；
S3. gather gridconnected point voltage information, determine that energystoring and powergenerating system is gained merit according to bulk power grid dispatch command simultaneously
And idle output demand；
S4. bearing power in meritorious and idle for energystoring and powergenerating system output demand, current energystoring and powergenerating system is needed
Ask, TRT is exportable meritorious and idle, exportable idle, the power attenuation of energy storage device of SVG equipment
Situation is as constraints, it is achieved the idle work optimization of energystoring and powergenerating system runs, and suppresses voltage pulsation.
Preferably, in step s 2, before accessing bulk power system, TRT monitoring module obtains energy storage
Electricity generation system ingredient basic data, the most quantitative in Theoretical Calculation object function；Join based on TRT
Number, builds TRT mathematical model, does earlystage preparations for calculating TRT loss, obtains storage further
The internal each several part physical parameter of energy electricity generation system, builds whole energystoring and powergenerating system mathematical model.
Preferably, in step s 4, idle work optimization runs and specifically includes following steps:
S41. by TRT monitoring module, obtain TRT running status in energystoring and powergenerating system, gain merit
Performance number, the real time data of energy storage device of energystoring and powergenerating system, energystoring and powergenerating system data acquisition during this
Integrate frequency range as 10s60s, extract data and go forward side by side row filter, reject and shut down or there is fault TRT number
According to；Based on real time data, set up energystoring and powergenerating system reactive power and voltage control model；Parallel control module
The energystoring and powergenerating system gridconnected point voltage instruction assigned according to dispatching patcher, if superior system does not assign instruction,
Then by the given instruction of middle control module；Change with the time scale of reactive power and select two kinds of control models；
If the most idle change yardstick changes with minute/hour level time scale, TRT control mode is turned
It is changed to constant active power controller, with energystoring and powergenerating system economical operation for controlling target, sets up object function,
S1 and S41 fetched data is substituted in model, carries out TRT without the distribution of work；
S43. solve object function, obtain TRT Reactivepower control value；According to also site realtime voltage, design
Management process, is divided into five grades by the voltage in adjustable extent, the corresponding different Reactivepower control of each grade
Amount, according to the running status that each TRT is different, is assigned to sending out of correspondence by the reactive power value obtained
Electric installation；
If the most idle change yardstick is with millisecond/second level time scale change, TRT operational mode is switched
For constant voltage control mode；With suppression voltage pulsation as target, set up object function, by S1 and S31 institute
Obtain data to substitute in model, carry out TRT without the distribution of work；
S45. in energystoring and powergenerating system, each unit receives Reactive power control instruction, completes according to self corresponding situation
Instruction, after performing instruction, feeds back to dispatching patcher by response value and gridconnected point voltage.
Preferably, by supervising device in S41, obtain energystoring and powergenerating system real time data and PCC point voltage
Control instruction, arranges PCC point voltage fluctuation threshold values；
Δ U= U_{WFcmd}U_{WFout}≤ξ
In formula, U_{WFcmd}For energystoring and powergenerating system site desired voltage values；U_{WFout}For energystoring and powergenerating system also
Site realtime voltage value；ξ is energystoring and powergenerating system voltage threshold；Δ U is gridconnected point voltage deviation value.
Preferably, in S42, set up the idle work optimization function being assigned as target with energystoring and powergenerating system economic optimization:
Min (F)=w_{1}P_{loss}+w_{2}Q_{C}+λ_{1}ΔU_{i}+λ_{2}ΔQ
In formula, P_{loss}For energystoring and powergenerating system active loss；Q_{C}For SVG equipment investment capacity；ΔU_{i}For respectively
Node voltage gets over limit value；ΔQ_{i}Send reactive power for TRT and get over limit value；w_{1}And w_{2}For active power loss and
The weight factor of reactive compensation capacity, and w_{1}+w_{2}=1；λ is penalty factor, is calculating optimal function, is rising
To restricted problem.
Preferably, S42 is analyzed calculate, first carries out calculating energystoring and powergenerating system Load flow calculation；According to
Energystoring and powergenerating system reactive power dimensional variation in time, determines TRT control model, in second/hour level
Time, TRT control mode is converted to power limitation control, calculates TRT to reduce network loss as mesh
Idle adjustable nargin under Biao, it is ensured that bound for objective function；Set up energystoring and powergenerating system economical operation
For the idle control mathematical model of target, by S1 and S41 the data obtained, substitute in model；
The copper loss of the loss of TRT predominantly TRT, its expression formula is:
In formula, R_{s}For generator unit stator resistance, R_{r}For generator amature resistance, I_{s}For stator current, I_{r}For turning
Electron current；
In transmission of electricity energystoring and powergenerating system, load is represented by ∏ shape equivalent circuit, load in series in energystoring and powergenerating system
Active loss be directly proportional to the current squaring passed through to reactive loss, it may be assumed that
U_{2}For PCC junction point voltage in energystoring and powergenerating system, load in one section of transmission energystoring and powergenerating system
Afterwards with bulk power grid before step voltage U_{1}It is connected；Voltage U_{2}Active power and the reactive power injected with access point have
Close；When fluctuation occurs in wind speed, stablizing of system PCC point busbar voltage can be affected, due to busbar voltage
Fluctuation, can increase the network loss of energystoring and powergenerating system, cause economic loss, when fluctuation is more than 10%, and can be to storage
The output of energy electricity generation system produces impact, so needing the reactive power of PCC point is regulated and controled, from
And maintain U_{2}Constant；
Under stable situation, energystoring and powergenerating system is incorporated into the power networks, and now energystoring and powergenerating system carries for accessing bulk power grid
For electric energy, using unity power factor control, whole energystoring and powergenerating system does not exchanges reactive power with electrical network；
Power system voltage regulating depends on TRT, energy storage device and electrical network parameter etc., is determined by reactive requirement,
Regulate its stator voltage, with rotor current；
For the purpose of electricity generation system active loss, set up object function:
P_{loss}=P_{1}+P_{2}+P_{3}
P_{3}=P_{LT}
In formula, P_{mi}, Q_{mi}It is respectively ith doublyfed generation device and injects meritorious, the idle injection rate of bus bar side；
U is that case becomes high side bus voltage；R_{Ti}, R_{Li}It is respectively conversion and becomes on hightension side resistance and current collection energy storage to case
Load resistance in electricity generation system；P_{1}For TRT copper loss；P_{2}For load loss in energystoring and powergenerating system；P_{3}
The active loss of energy storage device.
Preferably, with energystoring and powergenerating system loss minimization as principle, it is contemplated that every TRT active loss,
TRT active loss is mainly stator and rotor copper loss, and wherein stator current is:
Rotor current is:
By P_{cui}It is organized into about Q_{i}Oneplace 2th Order expression formula
In formula, U_{i}It it is the stator terminal voltage of ith TRT；X_{1i}=X_{si}+X_{mi}, X_{2i}=X_{ri}+X_{mi}, its
In, X_{si}、X_{m}、X_{ri}It is respectively the stator leakage reactance of ith TRT, excitation leakage reactance and rotor leakage reactance；
In energystoring and powergenerating system, the active loss reactive loss in load is expressed as:
In formula, Q_{Li}For connecting bus in energystoring and powergenerating system to TRT line concentration and the idle damage of energy storage device
Consumption value；
The active loss reactive loss of energy storage device is indicated:
To sum up, bear in TRT, energy storage device, energystoring and powergenerating system in proposition comprises energystoring and powergenerating system
It is loaded in the object function that interior active power loss is minimum:
Min (F)=w_{1}P_{loss}+w_{2}Q_{C}+λ_{1}ΔU_{i}+λ_{2}ΔQ
In formula, P_{loss}For energystoring and powergenerating system active loss；Q_{C}For SVG equipment investment capacity；ΔU_{i}For respectively
Node voltage gets over limit value；ΔQ_{i}Send reactive power for TRT and get over limit value；w_{1}And w_{2}For active power loss and
The weight factor of reactive compensation capacity, and w_{1}+w_{2}=1；With for penalty factor.
Preferably, wherein the trend constraints of Optimized model is:
Idle equality constraint is
Inequality constraints
Q_{imin}≤Q_{i}≤Q_{imax}
V_{i} ^{ref}V_{i} ^{err}≤V_{i}≤V_{i} ^{ref}+V_{i} ^{err}
In formula,It is that ith TRT maximum predicted sends power, Q_{imax}Idle for TRT maximum
Output valve, Q_{imin}For the minimum idle output valve of TRT, V_{i} ^{err}For node voltage fluctuation range.
Preferably, in step S43, gridconnected point voltage perunit value is divided into different brackets, respectively U_{a}、
U_{b}、U_{0}、U_{c}、U_{d}, using different grades of busbar voltage as amplitude limit, whole control process is managed,
Ensure, during reducing network loss, to take into account busbar voltage quality；Make U_{0}=1, i.e. occur without under abnormal conditions
Busbar voltage, makes U_{b}、U_{c}It is respectively U_{0}± 5%, make U_{a}、U_{d}It is respectively U_{0}± 10%；
(1) U is worked as_{2}When being in voltage magnitude bottom half；
1)U_{2}≤U_{a}Time, PCC point voltage reaches the lower limit that fluctuates, and needs energystoring and powergenerating system to provide reactive power,
Improving voltage, TRT control mode is converted to constant voltage control；
2)U_{a}≤U_{2}≤U_{b}Time, it is desirable to provide reactive power reduces energystoring and powergenerating system network loss, but still needs to nothing
Merit power assurance voltage, TRT is idle is output as in now regulation
3)U_{b}≤U_{2}≤U_{0}Time, this interval busbar voltage grade meets demand, and TRT provides reactive power
Reducing network loss, TRT is idle is output as in now regulation
Q=Q_{m}
(2) U is worked as_{2}When being in voltage magnitude upper half, regulation process is similar with flow process (1).
Preferably, in described step S44, set up the idle work optimization function of suppression multiple target voltage pulsation
In formula, U_{mea}For also site actual measurement voltage, U_{ref}For voltage reference value,For Control of Voltage gain system
Number,For voltage error integration time constant, K_{RX}For reactive power compensation gain coefficient, T_{int}During for controlling
Between yardstick.
First according to voltage measured value and voltage reference value, according to TRT constant voltage control mode, calculate
Under constant voltage control mode, the reactive requirement value of whole field；It is simultaneously introduced voltage pulsation inhibition function, obtains
The idle reference value of suppression voltage pulsation, obtains final reactive requirement value, according to energystoring and powergenerating system SCADA
Data, when TRT carries out reactive power distribution, need to take into full account going out in real time of each TRT
Power situation, operation conditions, could utilize algorithm that TRT is carried out different process.
When TRT is classified by the present invention, mainly account at two aspects, be first TRT
Operation conditions, in the assignment procedure, it should first the TRT that operation conditions is bad is paid the utmost attention to；Its
Secondary consideration wind speed and wind power prediction result, according to the running status between energystoring and powergenerating system TRT,
TRT is divided three classes.The first kind is next period shutdown TRT；Equations of The Second Kind is that TRT is adjusted
The TRT that the energyconservation force rate previous control cycle is strong, the 3rd class is that TRT regulating power ratio is previous
The TRT that the control cycle is weak.The allocation strategy of TRT is as follows.
In formula, Q_{ref}For suppression voltage pulsation calculated energystoring and powergenerating system reactive requirement；Q_{loss}For energy storage
Electricity generation system reactive loss.
Q_{i1}=0
In formula, Q_{ix}For the idle output valve of ith TRT of xth class, Q_{ix,t}Idle defeated for current period
Go out value, Q_{ix,t+1}Idle output valve for next cycle.
Above content is to combine concrete preferred implementation further description made for the present invention, no
Can assert the present invention be embodied as be confined to these explanations.Common for the technical field of the invention
For technical staff, without departing from the inventive concept of the premise, make some equivalents and substitute or obvious modification,
And performance or purposes are identical, protection scope of the present invention all should be considered as belonging to.
Claims (8)
1. can be used for regulating an idle energystoring and powergenerating system, this energystoring and powergenerating system includes:
TRT, for being converted into electric energy by green energy resource；
Load in energystoring and powergenerating system；
Energy storage device, is used for storing energy, and when can electricity generation system be incorporated into the power networks, output；
SVG equipment, for providing reactive power for energystoring and powergenerating system；
AC/DC bus, for realizing TRT in electricity generation system, energy storage device, energy storing and electricity generating system
Power Exchange between loading in system；
Gridconnecting apparatus, for realizing the Power Exchange between energystoring and powergenerating system and bulk power grid；
And supervising device；
This supervising device includes:
TRT monitoring module, monitors TRT, and enters the generated output of TRT in real time
Row prediction；
Parallel control module, for monitoring site ac bus voltage, and is used for controlling energystoring and powergenerating system
It is incorporated into the power networks via gridconnecting apparatus；
Energy storage device monitoring module, for the power attenuation situation of monitoring energy storage device in real time；
Load monitoring module, the load in monitoring energystoring and powergenerating system in real time；
SVG monitoring module, for monitoring SVG equipment in real time；
Middle control module, for determining the operation method of energystoring and powergenerating system, and each in abovementioned supervising device
Module sends instruction, to perform this operation method；
Communication bus, for the liaison of the modules of this supervising device.
2. the system as claimed in claim 1, it is characterised in that described energy storage device includes the twoway merit of the first kind
Rate changer, first kind energy storage device, Equations of The Second Kind bidirectional power converter and Equations of The Second Kind energy storage device；
First kind bidirectional power converter, for obtaining the parameter of the physical parameter on described AC/DC bus
Value, and when described parameter value changes, change first according to the rate of change of default charge/discharge rates
Class energy storage device carries out charge/discharge rates during discharge and recharge；Until the parameter value of described physical parameter is equal to first
Parameter value or equal to the second parameter value time, first kind energy storage device is carried out charge/discharge rates during discharge and recharge
No longer change；
Equations of The Second Kind bidirectional power converter, for obtaining the parameter value of described physical parameter, and in described parameter
When value arrives the boundary value of preset range, Equations of The Second Kind energy storage device is carried out discharge and recharge so that described parameter value
Maintain the boundary value of preset range, described first parameter value and described second parameter value and be respectively positioned on described presetting
In the range of.
3. system as claimed in claim 2, it is characterised in that according to the rate of change of default charge/discharge rates
Change charge/discharge rates when first kind energy storage device is carried out discharge and recharge and include two kinds of situations, the first situation
It is: change charging speed when first kind energy storage device is charged according to the rate of change of default charging rate
Degree；The second situation is: changes according to the rate of change of the default velocity of discharge and carries out first kind energy storage device
Velocity of discharge during electric discharge.
4. system as claimed in claim 3, it is characterised in that the energy density of first kind energy storage device is higher than
The energy density of Equations of The Second Kind energy storage device.In practice, first kind energy storage device can be accumulator, second
Class energy storage device can be super capacitor or flying wheel battery.
5. the system as claimed in claim 1, it is characterised in that described TRT monitoring module obtains in real time
The service data of TRT, and store data.
6. system as claimed in claim 5, it is characterised in that described TRT monitoring module, can obtain
TRT stator leakage reactance, generating unit rotor leakage reactance, TRT excitation leakage reactance, TRT stator electricity
Resistance, generating unit rotor resistance, by TRT parameter, build TRT mathematical model, for calculating
Earlystage preparations are done in loss, and obtain the internal each several part physical parameter of energystoring and powergenerating system, build whole energy storage
The topological model of electricity generation system.
7. system as claimed in claim 6, it is characterised in that TRT monitoring module, SVG monitor
Within the data acquiring frequency of module and load monitoring module is 10s60s, screens extracting data, pick
Except shutting down or there are fault TRT data, middle control module utilizes real time data, sets up energystoring and powergenerating system
Regulationcontrol model, power collection generator phase voltage, TRT phase current, TRT active power, generating
Device reactive power, reactiveload compensation equipment power, after retaining valid data, enter the hind computation stage.
8. system as claimed in claim 7, it is characterised in that this energystoring and powergenerating system enters in the following way
Row imaginary power automatic compensation:
By TRT monitoring module, obtain TRT running status, wattful power in energystoring and powergenerating system
Rate value, the energy storage device real time data of energystoring and powergenerating system, extract data and go forward side by side row filter, reject shut down or
There are fault TRT data；Based on real time data, set up energystoring and powergenerating system reactive power and voltage control
Model；The energystoring and powergenerating system gridconnected point voltage instruction that parallel control module is assigned according to dispatching patcher, if on
Level system does not assign instruction, then by the given instruction of middle control module；Choosing is changed with the time scale of reactive power
Select two kinds of control models；
If idle change yardstick changes with minute/hour level time scale, TRT control mode is converted to
Constant active power controller, with energystoring and powergenerating system economical operation for controlling target, sets up object function, will
Fetched data substitutes in model, carries out TRT without the distribution of work；
Solve object function, obtain TRT Reactivepower control value；According to also site realtime voltage, design pipe
Reason flow process, is divided into five grades by the voltage in adjustable extent, the corresponding different Reactivepower control amount of each grade,
According to the running status that each TRT is different, the reactive power value obtained is assigned to the generating dress of correspondence
Put；
If idle change yardstick is with millisecond/second level time scale change, TRT operational mode is switched to perseverance
Determine voltage control mode；With suppression voltage pulsation as target, set up object function, fetched data is substituted into
In model, carry out TRT without the distribution of work；
In energystoring and powergenerating system, each unit receives Reactive power control instruction, completes to refer to according to self corresponding situation
Order, after performing instruction, feeds back to dispatching patcher by response value and gridconnected point voltage.
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CN107093911A (en) *  20170510  20170825  成都鼎智汇科技有限公司  A kind of intelligent photovoltaic energystorage system 
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