CN108599199A - The improved micro-capacitance sensor internal frequency partition control method based on droop method control - Google Patents
The improved micro-capacitance sensor internal frequency partition control method based on droop method control Download PDFInfo
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The embodiment of the invention discloses a kind of busbar frequencies of detection micro-grid system；The region residing for the busbar frequency is determined according to preset frequency partition standard；Region residing for the busbar frequency controls the internal unit of micro-grid system.Implement the embodiment of the present invention, the frequency of different zones can be taken not by control strategy, it can be achieved that stablizing system frequency in national standard (GB/T12325) claimed range (49.5Hz -50.5Hz), ensure that the stability of system.
Description
Technical field
The present invention relates to micro-capacitance sensor technical fields, and in particular to it is a kind of it is improved based on droop method control micro-capacitance sensor inside
Frequency partition control method.
Background technology
Micro-capacitance sensor no matter in terms of structure, power supply and load, there is larger difference compared with traditional bulk power grid.This makes
The demand for control of micro-capacitance sensor cannot be adapted to again by obtaining traditional bulk power grid control method.
And in view of micro-grid system situation, when system self-energy fluctuates, often cause the voltage and frequency of system
Fluctuating change occurs for rate.When system frequency changes, needs to take appropriate control strategy, just can guarantee the stabilization of system
Property.
Invention content
The embodiment of the present invention is designed to provide a kind of improved micro-capacitance sensor internal frequency controlled based on droop method point
Area's control method, with the frequency to different zones take not by control strategy, realize to stablize system frequency and want in national standard
It asks in range, ensures the stability of system.
To achieve the above object, inside an embodiment of the present invention provides a kind of improved micro-capacitance sensor based on droop method control
Frequency partition control method, including：
Detect the busbar frequency of micro-grid system；
Determine that the region residing for the busbar frequency, the frequency partition standard include according to preset frequency partition standard
The areas AH, the areas AL, the areas BH, the areas BL, the areas CH and the areas CL；
Region residing for the busbar frequency controls the internal unit of micro-grid system.
As a kind of preferred embodiment of the application, if the busbar frequency is in the areas AH or the areas AL, to micro-capacitance sensor
The accumulator of system carries out charge control, control of discharge and balance control.
Specifically, control of discharge is carried out to the accumulator of micro-grid system to specifically include：
(1) status assessment is carried out to accumulator, if the accumulator completes electric discharge, reports host computer and change control mould
Formula is that balance control model is transferred to step (2) if the accumulator does not complete electric discharge；
(2) status assessment is carried out to the accumulator again and is transferred to step if the accumulator is in non-discharged state
(3)；
(3) if diesel engine is closed, according to priority ascending power sequence is sequentially reduced distributed electrical source power；If bavin
Oil machine is in open state, and accumulator cannot bear the load of diesel engine, then according to priority ascending power sequence is sequentially reduced distribution
Formula power.
4, method as claimed in claim 2 or claim 3, which is characterized in that control is balanced to the accumulator of micro-grid system
System specifically includes：
(1) current state of load is assessed, if the current state of the load is in metastable state, is turned
Enter step (2)；
(2) current state of distributed generator is assessed, if the distributed generator is in stable state,
It is transferred to step (3)；
(3) current state for obtaining diesel engine is transferred to step (4) if the diesel engine is in off-mode；
(4) if there are non-sensitive loads not to access situation for the micro-grid system, and current generation schedule allows this non-quick
Sense load access then accesses the non-sensitive load by load priority ascending power sequence；If the micro-grid system is non-sensitive negative
All accesses are carried, or current generation schedule does not allow non-sensitive load to access, then is transferred to step (5)；
(5) according to priority ascending power sequence is sequentially reduced distributed electrical source power.
Specifically, if the busbar frequency is in the areas BH, control is carried out to the internal unit of micro-grid system and is specifically included：
(1) state of charge of accumulator is estimated, if the accumulator is in underfill state, is transferred to step
(2), if the accumulator, which is in, has been filled with state, it is transferred to step (3)；
(2) charge control is carried out to the accumulator；
(3) if the disturbance time is more than 30 minutes and diesel engine is in open state, it is transferred to step (4)；If disturbing the time
More than 30 minutes and diesel engine was in off-mode, then was transferred to step (5)；
(4) the current generated output of diesel engine is assessed, diesel engine is closed according to assessment result or according to priority risen
Power reduces the generated output of distributed generator；
(5) it if the micro-grid system does not access situation there are unsupported, is sequentially ingressed by ascending power sequence described non-quick
Sense load, if the micro-grid system does not access situation there is no unsupported, according to priority ascending power reduces distributed generator
Generated output.
Specifically, if the busbar frequency is in the areas BL, control is carried out to the internal unit of micro-grid system and is specifically included：
(1) if distributed generation resource is 100% maximum output, it is transferred to step (2), if distributed generation resource non-100% is maximum
It contributes, then distributed generation resource is adjusted；
(2) status assessment is carried out to the accumulator to discharge to the accumulator if the accumulator can discharge
Control, conversely, being transferred to step (3)；
(3) if the disturbance time is less than 30 minutes, the discharge condition of accumulator is maintained, conversely, being transferred to step (4)；
(4) if diesel engine is in open state, and there are non-sensitive loads not to cut off situation for the micro-grid system, then presses
Drop power sequence cuts off non-sensitive load；If not sensitive loads complete resection, then reporting monitoring system, " micro-grid system is in the areas BL
Energy vacancy ", and maintain the statusquo.
Specifically, if the busbar frequency is in the areas CH, control is carried out to the internal unit of micro-grid system and is specifically included：
(1) if diesel engine is closed, check whether distributed generation resource breaks down one by one；
(2) if breaking down, distributed generation resource is cut off, conversely, being transferred to step (3)；
(3) it presses distributed generator priority and drops power number, cut off distributed generation resource one by one, and report overlayer monitors system
" areas CH failure occurs for micro-grid system "；
(4) if the disturbance time in the areas CH is more than preset time, micro-grid system is shut down, and reports master system event
Barrier.
Specifically, if the busbar frequency is in the areas CL, control is carried out to the internal unit of micro-grid system and is specifically included：
(1) control of discharge is carried out to accumulator, and detects diesel engine state, if diesel engine is in open state, be transferred to
Step (2)；
(2) check whether distributed generation resource is in 100% output state, if so, adjust to 100% output state, if
It is no, it is transferred to step (3)；
(3) non-sensitive load access micro-grid system has been detected whether, if so, all non-sensitive loads are then cut off, if nothing,
Then it is transferred to step (4)；
(4) if there are failures for distributed generator and level-one load, excision system operation is taken；
(5) degree of stability for estimating micro-grid system reports overlayer monitors system " micro-grid system frequency according to estimation results
The areas rate CL failure " carries out shutdown operation to system.
Implement the embodiment of the present invention, first detects micro-grid system busbar frequency, it is true further according to preset frequency partition standard
Determine region residing for busbar frequency, finally the internal unit of micro-grid system is controlled according to residing region；That is, the present invention is real
Apply example the frequency of different zones can be taken not by control strategy, it can be achieved that by system frequency stablize in national standard (GB/
T12325) in claimed range (49.5Hz -50.5Hz), it ensure that the stability of system.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar reference numeral.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is the improved micro-capacitance sensor internal frequency subregion control controlled based on droop method that first embodiment of the invention provides
The flow diagram of method processed；
When Fig. 2 is that frequency is in the areas A, to the charge control flow chart of accumulator；
When Fig. 3 is that frequency is in the areas A, to the control of discharge flow chart of accumulator；
When Fig. 4 is that frequency is in the areas A, the control flow chart of battery float power additional charge situation；
When Fig. 5 is that frequency is in the areas A, the control flow chart of battery float power extra discharge situation；
Fig. 6 is FREQUENCY CONTROL flow chart when frequency is in the areas BH；
Fig. 7 is FREQUENCY CONTROL flow chart when frequency is in the areas BL；
Fig. 8 is FREQUENCY CONTROL flow chart when frequency is in the areas CH；
Fig. 9 is FREQUENCY CONTROL flow chart when frequency is in the areas CL.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " comprising " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, element, component and/or its presence or addition gathered.It is also understood that the institute in this description of the invention
The term used is not intended to limit the present invention merely for the sake of the purpose of description specific embodiment.Such as in description of the invention
With it is used in the attached claims like that, other situations unless the context is clearly specified, otherwise singulative
" one ", "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combinations and all possible combinations of one or more of associated item listed, and includes these combinations.
As used in this specification and in the appended claims, term " if " can be according to context quilt
Be construed to " when ... " or " once " or " in response to determination " or " in response to detecting ".Similarly, phrase " if it is determined that " or
" if detecting [described condition or event] " can be interpreted to mean according to context " once it is determined that " or " in response to true
It is fixed " or " once detecting [described condition or event] " or " in response to detecting [described condition or event] ".
Embodiment for a better understanding of the present invention is first done as described below：
Micro-capacitance sensor control strategy designed by the present embodiment, final purpose realize the energy balance in micro-capacitance sensor, i.e., respectively
The sum of distributed generator generated energy is equal to load the sum of electric power, while realizing the steady of micro-capacitance sensor builtin voltage and frequency
It is fixed, as shown in formula 3-1 to 3-3
Vmin≤V(t)≤Vmax (3-1)
fmin≤f(t)≤fmax (3-2)
∑PDG(t)=∑ Pload(t) (3-3)
Wherein, V (t) is current time system busbar voltage, should be between defined upper limit VmaxWith lower limit VminBetween.
F (t) is the frequency of current time busbar, should be between defined upper limit fmaxWith lower limit fminBetween.According to state's household electric matter
It measures safety standard GB/T12325 and requires [54], system voltage index is V in the present embodimentmax=235.4V and Vmin=198V, together
When in view of micro-capacitance sensor installed power it is smaller, according to national standard GB/T15945 require, and in view of micro-capacitance sensor self-capacity it is smaller,
Therefore the present embodiment design frequency index is fmax=50.5Hz and fmin=49.5Hz.∑PDG(t) it is current time, it is each in micro-capacitance sensor
The power summation of a distributed generation resource.Each distributed generation resource includes diesel engine, accumulator, photovoltaic generator and wind-power electricity generation
Machine, specific expression formula is as shown in formula 3-4：
∑PDG=Pbat(t)+Pwind(t)kMTTP_wind+Psolar(t)kMTTP_solar+Pengine(t)kMTTP_engine (3-4)
Wherein Pbat(t) it is the current charge-discharge electric power of accumulator, charge and discharge are controlled by bidirectional energy-storage inverter PCS, from being
The system optimal consideration of stability, preferably controls Pbat(t) it is within the scope of optimal balance, and controls the current charge shape of accumulator
State (SOC) is within the scope of regular picture.Pwind(t) it is the current generated output of wind turbine, kMTTP_windFor wind turbine gird-connected inverter
MTTP maximum limit power factors, value range be 0-100%.Psolar(t) it is the current generated output of photovoltaic generator,
kMTTP_solarFor the MTTP maximum limit power factors of photovoltaic combining inverter, value range is 0-100%.Pengine(t) it is
The real-time generated output of diesel-driven generator, kMTTP_engineMTTP maximum limit power factors are carried for diesel-driven generator.
∑Pload(t) it is load value in the system at current time, specific expression is as shown in formula (3-5)：
∑Pload(t)=∑ Psensitive(t)+∑PNon-sensitive(t)+∑PEquipment(t) (3-5)
Wherein ∑ PEquipment(t) be equipment in current time system, such as inverter oneself power consumption.∑Psensitive
(t) and ∑ PNon-sensitive(t) be sensitive loads and non-sensitive load in current time system load summation situation.This chapter
Designed control strategy takes grading control strategy to loading, specific hierarchical policy, as shown in table 1：
Table 1：Load priority order standard
Similarly, the embodiment of the present invention has also made priority assessment, specific judgment criteria to the power generation sequence of generator
Such as table 2：
Table 2：Generator order of priority standard
As shown in table 2, the priority to generate electricity mainly considers that its stability and economic performance, diesel engine conduct are most stable
Generator consider for economic factor when daily honourable energy storage meets the daily power demand of micro-capacitance sensor, do not put into power generation meter
It draws.When the electric energy that daily wind-light storage provides partial notch occurs or system the failures such as frequency shift (FS) occurs and electric energy is needed to put into
When, diesel engine comes into operation power generation.The deployment of diesel engine is mainly for continuous haze and quiet steady weather, and calm intensity of illumination is not
Situations such as weather of foot, winter photovoltaic efficiency is low, uses.
Referring to FIG. 1, being the improved micro-capacitance sensor inside frequency controlled based on droop method that first embodiment of the invention provides
The schematic flow diagram of rate partition control method, as shown, this method may comprise steps of：
S101 detects the busbar frequency of micro-grid system.
S102 determines the region residing for the busbar frequency according to preset frequency partition standard.
Wherein, frequency partition standard includes the areas AH, the areas AL, the areas BH, the areas BL, the areas CH and the areas CL, and corresponding numerical value is such as
Shown in table 3.
| Section title | Frequency range |
| The areas CH | 52Hz or more |
| The areas BH | 50.5Hz—52Hz |
| The areas AH | 50Hz—50.5Hz |
| The areas AL | 49.5Hz—50Hz |
| The areas BL | 48Hz—49.5Hz |
| The areas CL | 48Hz or less |
Table 3：Frequency partition standard
S103, the region residing for busbar frequency control the internal unit of micro-grid system.
As shown in table 3, when frequency separation is within the scope of the areas AH or AL, micro-grid system only needs to carry out without intervening
Formula (3-6) is realized in energy balance distribution
ΣPload(t)=Σ PDG(t),PBAT=0 (3-6)
When frequency is in the areas AH or the areas AL, system without excessive interference, specific control strategy will subsequent content into
Row is described in detail.
When frequency is in the areas BH or the areas BL, generally caused by system disturbance factor, need at this time according to P-f droop methods into
Row is adjusted, and specific control strategy will be described in detail in subsequent content.
When frequency is in the areas CL or the areas CH, generally by equipment fault, or the serious imbalance of load causes, need at this time into
Row carries out emergent control to system, and specific control strategy will be described in detail in subsequent content.
One, busbar frequency is in the FREQUENCY CONTROL strategy in the areas A
When frequency is in the areas A, system can carry out accumulator within this section without excessive interference to system
Charge control, control of discharge and balance control.Accumulator is maintained in an optimum state, it is upcoming various to cope with
Situation, such as haze weather accumulator persistently energize, and night accumulator persistently energizes, and the balance of extreme wind weather system maintains
Deng.Meanwhile " full be full of is put " operation regularly is carried out to accumulator, be conducive to the extension of the life of storage battery, internal storage battery subtracts
Situations such as polarizing less.
The charging of accumulator, electric discharge and balance control strategy will be described in detail respectively below.
1, Battery charge controller
To the charge control of accumulator, the concrete measure taken is to increase the hair of system in the micro-grid system steady period
Electrical power, and will be in additional generated energy storage to accumulator.Its specific control flow is as shown in Figure 2：
(1) state estimation is carried out to accumulator, if charging is completed in accumulator, reporting overlayer monitors system, " system is complete
Charge at accumulator ", and control model is transferred to battery balance control model；If not completing to charge, step is jumped to
Suddenly (2).
(2) state current to accumulator is assessed, if current accumulator is in charged state, is transferred to step
(3), if accumulator is still within non-charged state at this time, it is transferred to step (5).
(3) system is in charged state at this time, checks whether distributed generator current state is 100% output, if
It contributes for 100%, is then transferred to step (4), it is 100% otherwise to adjust each distributed generator MTTP control coefrficients, terminates this
Controlling cycle simultaneously waits for next cycle data to be judged.
(4) if diesel engine state is to have turned on, system is not intervened, terminates the controlling cycle and waits for next
Cycle data is judged.If diesel engine state is not open, current generation schedule is checked, if current generation schedule allows bavin
Oil machine is opened, then opens diesel engine and generate electricity, and control system general power is filled within battery maximum charge power
Electric control.If the not permission, does not intervene system, terminates the controlling cycle and next cycle data is waited for carry out
Judge.
(5) system is in discharge condition at this time, checks whether distributed generator current state is 100% output, if
It contributes for 100%, is then transferred to step (6), it is 100% otherwise to adjust each distributed generator MTTP control coefrficients, terminates this
Controlling cycle simultaneously waits for next cycle data to be judged.
(6) it checks current diesel engine state, if diesel engine is open state, is transferred to step (7).If diesel engine is shutdown
State checks current generation schedule, generates electricity if current generation schedule allows diesel engine to open diesel engine.Terminate control week
Phase simultaneously waits for next cycle data to be judged.If current generation schedule does not allow to open diesel engine, overlayer monitors system is reported
System, request diesel engine opens permission, and is transferred to step (7).
(7) it checks current non-sensitive load access system situation, if current system has non-sensitive load to access, and if works as
Preceding generation schedule allows to cut off sensitive loads, then within the non-sensitive loading range that current generation schedule allows excision, according to
Power sequence drops in load priority, cuts off non-sensitive load successively.Terminate current control period and next cycle data is waited for carry out
Judge.If sensitive loads access or generation schedule do not allow to cut off non-sensitive load current system nothing but, it is transferred to step
(8)。
(8) overlayer monitors system " system charge power is insufficient " is reported, and enables accumulator and carries out control of discharge, maintains system
System is stablized.Wait for overlayer monitors system control instruction.Terminate current control period and next cycle data is waited for be judged.
2, battery discharging controls
To the control of discharge of accumulator, takes in the system steady period, reduce the generated output of system, by accumulator to portion
Load is divided to carry out electric discharge energy supply.Maintain the discharge power of accumulator within a certain OK range simultaneously.Its specific control flow
As shown in Figure 3：
(1) carry out status assessment to accumulator reports host computer battery discharging complete if accumulator has been completed to discharge
Finish, and changes control model and controlled for battery balance.Terminate current control period and next cycle data is waited for be judged.
If accumulator is not completed to discharge, it is transferred to step (2).
(2) status assessment is carried out to accumulator and is transferred to step (3) if accumulator is in non-discharged state.If accumulator
In discharge condition, then checks that diesel engine opens situation, if diesel engine current state is to close, intervention is not added with to system,
Terminate current control period and next cycle data is waited for be controlled.If diesel engine is open state and meets formula 3-28
PBAT(t)+Pengine(t)<PBAT_Discharge_MAX (3-28)
Wherein, PBAT_Discharge_MAXIt is the maximum allowable discharge power of accumulator
Diesel engine is closed at this time, load is powered by accumulator, battery consumption electric energy.Terminate the controlling cycle simultaneously
Next cycle data is waited for be judged.If being unsatisfactory for formula 3-28, system is not intervened, terminates current control week
Phase, and next cycle data is waited for be judged.
(3) under discharge condition, check that diesel engine opens situation, if diesel engine is in open state, and current data is full
Sufficient formula 3-28 then closes diesel engine, terminates current control period and next cycle data is waited for be judged.If diesel engine
In off-mode or it is unsatisfactory for formula 3-28, then is transferred to step (4).
(4) generator priority ascending power sequence is pressed, is sequentially reduced the MTTP control coefrficients of distributed generator, and by electric power storage
The discharge power in pond maintains in best section.Terminate the controlling cycle and next cycle data is waited for be judged.
3, battery balance controls
When system is in voltage in the metastable section of frequency, the load balance in system is preferentially charged by accumulator
It is controlled.Because the reaction speed of accumulator is optimal and system needed for charge-discharge electric power it is not too large.When filling for accumulator
Discharge power is within a certain range, which need not then be intervened.When
When the charge power of accumulator exceeds the domain of walker, specific control flow is as shown in Figure 4：
(1) load condition is assessed, if the power of load is in fluctuation status, is not interfered.Terminate current
Controlling cycle simultaneously waits for next cycle data to be judged.If load is in metastable state, it is transferred to step (2).
(2) distributed generator state is assessed, if wind turbine plays pendulum with photovoltaic, according to its phase
The assessment result answered is operated accordingly, such as wind turbine is in high-lying well unstable state, then machine processing is cut, if at photovoltaic
In night not generating state, then takes and cut machine processing.If due to extreme weather, wind turbine is caused to generate larger energy impact, then
Accumulator is taken to absorb the energy impact for maintaining stablizing relatively for system.Terminate the controlling cycle and waits for next periodicity
According to being judged.If distributed generator is in stable state, it is transferred to step (3)
(3) check that diesel engine current state is transferred to step (4), if at diesel engine if diesel engine is in open state
In off-mode, then step (5) is transferred to.
(4) if current system meets formula 3-29
PBAT+Pengine<PBAT_Blance_Discharge_Limit (3-29)
Wherein PBAT_Blance_Discharge_LimitFor the maximum charge power of battery float power.
Diesel engine is then closed, the controlling cycle is terminated and next cycle data is waited for be judged.If being unsatisfactory for formula 3-
29, then it is transferred to step (5).
(5) if system still has the non-sensitive non-access system of load, and current generation schedule allows the non-sensitive load access
System then presses load priority ascending power sequence, accesses non-sensitive load.If the whole non-sensitive load access system of system, or
Generation schedule does not allow non-sensitive load access system, then is transferred to step (6).
(6) according to priority ascending power sequence adjusts generator MTTP control coefrficients, until meeting formula (3-30)
Terminate current control period and next cycle data is waited for be judged.
If the discharge power of accumulator is more than the domain of walker, control flow is as shown in Figure 5：
(1) carry out status assessment to accumulator reports host computer battery discharging complete if accumulator has been completed to discharge
Finish, and changes control model and controlled for battery balance.Terminate current control period and next cycle data is waited for be judged.
If accumulator is not completed to discharge, it is transferred to step (2).
(2) distributed generator state is assessed, if wind turbine plays pendulum with photovoltaic, according to its phase
The assessment result answered is operated accordingly, such as wind turbine is in high-lying well unstable state, then machine processing is cut, if at photovoltaic
In night not generating state, then takes and cut machine processing.If due to extreme weather, wind turbine is caused to generate larger energy impact, then
Accumulator is taken to absorb the energy impact for maintaining stablizing relatively for system.Terminate the controlling cycle and waits for next periodicity
According to being judged.If distributed generator is in stable state, it is transferred to step (3).
(3) if diesel engine is in open state, it is transferred to step (4), if diesel engine is closed, is transferred to step
Suddenly (6).
(4) if distributed generation resource is in 100% output state, it is transferred to step (5), if distributed generation resource is not in
100% output state increases its MTTP control coefrficient by generator priority ascending power sequence, prevents 100% or meets formula 3-
30, terminate current control period and next cycle data is waited for be judged.
(5) if access has non-sensitive load in system and generation schedule allows to cut off the sensitive loads, by load
Power sequence excision load drops in priority, terminates the controlling cycle and next cycle data is waited for be judged.If nothing in system
Non-sensitive load or generation schedule do not allow to cut off the non-sensitive load, then reporting overlayer monitors system, " areas system A energy is not
Foot ", and control accumulator and continue to discharge, maintain system description.Terminate the controlling cycle and next cycle data is waited for be sentenced
It is disconnected.
(6) if distributed generation resource is in 100% output state, it is transferred to step (7), if distributed generation resource is not in
100% output state increases its MTTP control coefrficient by generator priority ascending power sequence, until 100% or meeting formula 3-
30, terminate current control period and next cycle data is waited for be judged.
(7) if the requirement of system parameter current coincidence formula 3-31
PBAT+Pengine_full>PBAT_Blance_Charge_Limit (3-31)
Wherein PBAT_Blance_Charge_LimitIt is negative value for the maximum allowable charge power of battery float power.
And generation schedule allows diesel engine to use, then opens diesel engine and generate electricity, system finishing current control period is simultaneously
Next cycle data is waited for be judged.If system is unsatisfactory for formula 3-31 requirements, it is transferred to step (8).If system meets
Formula 3-31 is required but generation schedule does not allow generator to come into operation, and is also transferred to step (8).
(8) if access has non-sensitive load in system and generation schedule allows to cut off the sensitive loads, by load
Power sequence excision load drops in priority, terminates the controlling cycle and next cycle data is waited for be judged.If nothing in system
Non-sensitive load or generation schedule do not allow to cut off the non-sensitive load, then reporting overlayer monitors system, " areas system A energy is not
Foot ", and control accumulator and continue to discharge, maintain system description.Terminate the controlling cycle and next cycle data is waited for be sentenced
It is disconnected.
Two, busbar frequency is in the FREQUENCY CONTROL strategy in the areas BH
When busbar frequency is in the areas BH, normally due to caused by active power is excessively high in system, but this disturbance may
It is instantaneous.It when detecting that busbar frequency enters the areas BH, should not be operated at once, it is possible to cause system to be shaken, drop
The robustness of low system.Therefore, when busbar frequency enters the areas BH, specific control flow is as shown in Figure 6：
(1) state of charge of accumulator is estimated, if accumulator is in chargeable underfill state, jumps to step
Suddenly (2).If accumulator be in charging full of can not charged state, jump to step (3).
(2) charge control is carried out to control accumulator, absorbs extra active power, and jump to step (3)
(3) if the disturbance continues 30 minutes or more, step (4) is jumped to.Otherwise terminate the control in the period, and wait
Wait for that next cycle data are judged.
(4) if diesel engine jumps to step (5) now at open state, step (6) is otherwise jumped to.
(5) generated output of diesel engine at this time is simply assessed, if meeting formula (3-17), jumps to step
(6) step (8) is otherwise jumped to,
PBAT_MIN<PBAT(t)+Pengine(t)<PBAT_MAX (3-17)
Wherein PBAT_MINIt is the charge power limit that accumulator can be born, PBAT_MAXIt is the discharge power that accumulator can be born
The limit.
(6) diesel engine is closed, charge and discharge control is carried out to accumulator, and suitably reduce battery discharging power.Terminating should
The control in period, and next cycle data is waited for be judged.
(7) distributed generator priority ascending power sequence is pressed, reduces the generated output of distributed generator one by one.Terminating should
The control in period, and next cycle data is waited for be judged.
(8) if in system, the load not accessed also then jumps to step (9), otherwise jumps to step (7).
(9) the ascending power priority orders for pressing load will load access system one by one.Terminate the control in the period, and waits for
Next cycle data are judged.
Three, busbar frequency is in the FREQUENCY CONTROL strategy in the areas BL
When busbar frequency is in the areas BL, specific control flow is as shown in Figure 7：
(1) if system frequency drops to the areas BL, the distributed generation resource in system, such as photovoltaic are first checked for, wind turbine etc. is
No is 100% maximum output, if not 100% contributes, then adjustment incrementally increases its power factor to 100%, terminates period control
It makes and next cycle data is waited for be judged, otherwise jump to step (2).
(2) there is the disturbance of the areas BL, then accumulator status is judged, it, can if accumulator does not reach electric discharge lower limit
With electric discharge, then go to step (3), otherwise gos to step (4).
(3) control accumulator discharges, and is system function, keep frequency is stablized, and gos to step (5).
(4) if disturbance is less than 30 minutes, battery discharging state is maintained, terminating the period controls and wait for next period
Data are judged.Otherwise jump procedure (5)
(5) if diesel engine is in open state, jump procedure (6) otherwise opens diesel engine, terminates period control simultaneously
Next cycle data is waited for be judged.
(6) loading condition in system is judged, if still there is non-sensitive load to access, it is suitable gradually presses load drop power
Sequence cuts off non-sensitive load.Terminating the period controls and next cycle data is waited for be judged.If non-sensitive load is all
Excision, jumps to step (7).
(7) overlayer monitors system " system is in the areas BL energy vacancy " is reported, and maintains all distributed power generations of internal system
Machine, which is contributed, to be maximized, and the control instruction of top level control system is waited for.Terminating the period controls and waits for next cycle data, carries out
Judge.
Four, busbar frequency is in the FREQUENCY CONTROL strategy in the areas CH
It is a more dangerous state, it is necessary to change this in time in a short time when system frequency is in the areas CH
Region, otherwise system is by the danger collapsed.So need to carry out status assessment to distributed generation resource one by one, and it is negative to reject failure
It carries, specific control flow is as shown in Figure 8：
(1) when system detectio to frequency enters the areas CH, diesel engine state is first checked for, if diesel engine is open state,
Then shut down.Terminating the period controls and next cycle data is waited for be judged.Otherwise step (2) is jumped to.
(2) it gradually checks whether each distributed generation resource breaks down, the distributed generation resource is then cut off if there is failure.
Terminating the period controls and next cycle data is waited for be judged.Otherwise step (3) is jumped to.
(3) power sequence is dropped according to generator priority, cuts off distributed generation resource one by one, and report the overlayer monitors system " to be
The areas CH failure occurs for system ".And go to step (4).
(4) check whether the areas CH disturbance exceeds schedule time, if being less than the stipulated time, maintenance system description is simultaneously most
It may keep the frequency stabilization of system.Terminating the period controls and next cycle data is waited for be judged.If when more than regulation
Between, it gos to step (5).
(5) micro-grid system is shut down, to protect the equipment safety of important equipment and generator inside micro-capacitance sensor.To accumulator
Electricity assessed, do black starting-up prediction scheme preparation.Reporting overlayer monitors system, " catastrophe failure and stop over occur for system
Machine " waits for the instruction of overlayer monitors system black starting-up.
Five, busbar frequency is in the FREQUENCY CONTROL strategy in the areas CL
When system frequency is in the areas CL, spy is a more dangerous state, it is necessary to change this in time in a short time
A region, otherwise the failure of system can lead to the damage of micro-capacitance sensor internal unit, the protection of the isolated island of the distributed generation resource that sets out is shut down,
Cause more serious consequence.So the control strategy in this section is supplied with fast lifting internal system electric energy, excision one
Unnecessary load is cut, rapid evaluation distributed generation resource malfunction is core concept, and specific control flow is as shown in Figure 9：
(1) when system detectio to system is in the areas CL, control of discharge is carried out to accumulator immediately, because of the startup of accumulator
Speed is most fast with reaction speed.It is transferred to step (2) later.
(2) state for detecting diesel-driven generator, if off-mode, then it is that system fills energy to open diesel engine.Terminate the control
Period processed simultaneously waits for next cycle data to be judged.If diesel engine is open state, it is transferred to step (3).
(3) detect whether other distributed generation resources stand in 100% output state if being not at 100% output state
It is 100% to adjust its MTTP coefficient.Terminate the controlling cycle and next cycle data is waited for be judged.Go out if 100%
Power state is transferred to step (4).
(4) detect whether non-sensitive load has access micro-grid system.If so, cutting off all non-sensitive loads immediately.
Terminate the controlling cycle and next cycle data is waited for be judged.If sensitive loads access system nothing but gos to step
(5)。
(5) detecting system distributed generator whether failure, level-one load whether there is failure.Corresponding failure is taken and is cut
Except the operation of system.And it is transferred to step (6).
(6) degree of stability of Prediction System, if meeting formula 3-18 and formula 3-19
Δ f (n)=f (t)-f (t-1) (3-18)
Then illustrate that the frequency of system is still within shift state and is worse off, step (7) should be transferred at this time, otherwise reported
Overlayer monitors system " areas system frequency CL failure ", and make great efforts maintenance system stable state, wait for overlayer monitors system command.Knot
The beam cycleoperation simultaneously waits for next cycle data to be judged.
(7) if system frequency is in continuous worsening state and is not made to the load of internal system to protect system equipment
At damage, micro-grid system is shut down.Report host computer " system has been shut down, and the areas CL frequency fault is in ".To accumulator status into
Row assessment, does black starting-up prediction scheme.Wait for the instruction of overlayer monitors system boot.
Implement the embodiment of the present invention, first detects micro-grid system busbar frequency, it is true further according to preset frequency partition standard
Determine region residing for busbar frequency, finally the internal unit of micro-grid system is controlled according to residing region；That is, the present invention is real
Apply example the frequency of different zones can be taken not by control strategy, it can be achieved that by system frequency stablize in national standard (GB/
T12325) in claimed range (49.5Hz -50.5Hz), it ensure that the stability of system.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (8)
1. a kind of improved micro-capacitance sensor internal frequency partition control method based on droop method control, which is characterized in that including：
Detect the busbar frequency of micro-grid system；
The region residing for the busbar frequency is determined according to preset frequency partition standard, and the frequency partition standard includes AH
Area, the areas AL, the areas BH, the areas BL, the areas CH and the areas CL；
Region residing for the busbar frequency controls the internal unit of micro-grid system.
2. the method as described in claim 1, which is characterized in that if the busbar frequency is in the areas AH or the areas AL, to micro- electricity
The accumulator of net system carries out charge control, control of discharge and balance control.
3. method as claimed in claim 2, which is characterized in that carry out control of discharge to the accumulator of micro-grid system and specifically wrap
It includes：
(1) status assessment is carried out to accumulator, if the accumulator completes electric discharge, reports host computer and change control model and be
Control model is balanced, if the accumulator does not complete electric discharge, is transferred to step (2)；
(2) status assessment is carried out to the accumulator again and is transferred to step (3) if the accumulator is in non-discharged state；
(3) if diesel engine is closed, according to priority ascending power sequence is sequentially reduced distributed electrical source power；If diesel engine
In open state, and accumulator can not bear the load of diesel engine, then according to priority ascending power sequence is sequentially reduced distributed electrical
Source power.
4. method as claimed in claim 2 or claim 3, which is characterized in that be balanced control tool to the accumulator of micro-grid system
Body includes：
(1) current state of load is assessed, if the current state of the load is in metastable state, is transferred to step
Suddenly (2)；
(2) current state of distributed generator is assessed, if the distributed generator is in stable state, is transferred to
Step (3)；
(3) current state for obtaining diesel engine is transferred to step (4) if the diesel engine is in off-mode；
(4) if there are non-sensitive loads not to access situation for the micro-grid system, and current generation schedule allows this non-sensitive negative
Access is carried, then accesses the non-sensitive load by load priority ascending power sequence；If the non-sensitive load of the micro-grid system is
All accesses, or current generation schedule do not allow non-sensitive load to access, then are transferred to step (5)；
(5) according to priority ascending power sequence is sequentially reduced distributed electrical source power.
5. the method as described in claim 1, which is characterized in that if the busbar frequency is in the areas BH, to micro-grid system
Internal unit carries out control and specifically includes：
(1) state of charge of accumulator is estimated, if the accumulator is in underfill state, is transferred to step (2), if
The accumulator is in and has been filled with state, then is transferred to step (3)；
(2) charge control is carried out to the accumulator；
(3) if the disturbance time is more than 30 minutes and diesel engine is in open state, it is transferred to step (4)；If the disturbance time is more than
30 minutes and diesel engine are in off-mode, then are transferred to step (5)；
(4) the current generated output of the diesel engine is assessed, diesel engine is closed according to assessment result or according to priority risen
Power reduces the generated output of distributed generator；
(5) it if the micro-grid system does not access situation there are unsupported, is sequentially ingressed by ascending power sequence described non-sensitive negative
It carries, if the micro-grid system does not access situation there is no unsupported, according to priority ascending power reduces the hair of distributed generator
Electrical power.
6. the method as described in claim 1, which is characterized in that if the busbar frequency is in the areas BL, to micro-grid system
Internal unit carries out control and specifically includes：
(1) if distributed generation resource is 100% maximum output, it is transferred to step (2), if non-100% maximum output of distributed generation resource,
Then distributed generation resource is adjusted；
(2) status assessment is carried out to the accumulator and electric discharge control is carried out to the accumulator if the accumulator can discharge
System, conversely, being transferred to step (3)；
(3) if the disturbance time is less than 30 minutes, the discharge condition of accumulator is maintained, conversely, being transferred to step (4)；
(4) if diesel engine is in open state, and there are non-sensitive loads not to cut off situation for the micro-grid system, then presses drop power
Sequence cuts off non-sensitive load；If not sensitive loads complete resection, then reporting monitoring system, " micro-grid system is in the areas BL energy
Vacancy ", and maintain the statusquo.
7. the method as described in claim 1, which is characterized in that if the busbar frequency is in the areas CH, to micro-grid system
Internal unit carries out control and specifically includes：
(1) if diesel engine is closed, check whether distributed generation resource breaks down one by one；
(2) if breaking down, distributed generation resource is cut off, conversely, being transferred to step (3)；
(3) it presses distributed generator priority and drops power number, cut off distributed generation resource one by one, and report overlayer monitors system " micro-
The areas CH failure occurs for network system "；
(4) if the disturbance time in the areas CH is more than preset time, micro-grid system is shut down, and reports master system failure.
8. the method as described in claim 1, which is characterized in that if the busbar frequency is in the areas CL, to micro-grid system
Internal unit carries out control and specifically includes：
(1) control of discharge is carried out to accumulator, and detects diesel engine state, if diesel-driven generator is in open state, be transferred to
Step (2)；
(2) check whether distributed generation resource is in 100% output state, if so, adjusting to 100% output state, if it is not, turning
Enter step (3)；
(3) it has detected whether non-sensitive load access micro-grid system, has turned if nothing if so, then cutting off all non-sensitive loads
Enter step (4)；
(4) if there are failures for distributed generator and level-one load, excision system operation is taken；
(5) degree of stability for estimating micro-grid system reports overlayer monitors system " micro-grid system frequency CL according to estimation results
Area's failure " carries out shutdown operation to system.
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