CN109842147A - A kind of control system and its method of micro-grid connection dominant eigenvalues - Google Patents
A kind of control system and its method of micro-grid connection dominant eigenvalues 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
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/28—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The invention discloses the control system and its method of a kind of micro-grid connection dominant eigenvalues, method and step includes: that micro-capacitance sensor central controller acquires micro-capacitance sensor and each electrical quantity of interconnection；Judge agreement power PAgrWith micro-capacitance sensor net load PNetRelationship；Agreement power PAgrPredicted value is provided by Energy Management System, if Energy Management System does not give value, agreement power PAgrValue is micro-capacitance sensor net load power PNetThe Δ t time in average value, work as PAgr> PNet, then by micro-capacitance sensor central controller transmitting order to lower levels to battery management system, energy-storage units power output is adjusted, energy-storage units power generating value is PB=PAgr‑PNet；Work as PAgr≤PNet, then energy-storage units power output is stopped by micro-capacitance sensor central controller transmitting order to lower levels to battery management system, energy-storage units start to charge.Present invention response is fast, and scheme is simple, and stability is good.
Description
Technical field
The present invention relates to micro-capacitance sensor technical field, the control system of especially a kind of micro-grid connection dominant eigenvalues and its
Method.
Background technique
In recent years, with the rapid development of economy, the demand of the energy sharply increases, and distributed generation technology is with its energy
The features such as source utilization rate is high, pollution is small has received widespread attention, and micro-capacitance sensor also receives focus attentions equally on as its technical support.It is micro-
Distributed generation resource, load, energy storage device and control system are combined together by network system, form a small-sized power train
System.Micro-capacitance sensor and bulk power grid can support each other, while the flexibility of micro-capacitance sensor makes it that can be incorporated into the power networks and can transport with isolated island
Row, being incorporated into the power networks can largely guarantee that micro-capacitance sensor is safely operated, but the dominant eigenvalues of itself and power distribution network usually have one
Determine restrict.
In micro-capacitance sensor, the output power of wind-powered electricity generation and photovoltaic distributed power supply has intermittent and randomness spy
Point, load variations often also embody certain fluctuation, this brings larger challenge to the stable operation of micro-capacitance sensor.Micro-capacitance sensor
When being incorporated into the power networks, the peak-valley difference characteristic of load and the fluctuation of distributed generation resource are often and deposit.So the big rule of power grid
After mould accesses distributed generation resource, biggish power swing will generate serious impact to regional distribution network, or even region is caused to match
The concussion of power grid.Bring a series of problems after above-mentioned micro-grid connection cannot be such as efficiently solved, the fast of micro-capacitance sensor will be hindered
Speed development and efficiently utilization.Also there is the more relevant relevant programme for micro-grid connection in the prior art, but scheme is complicated,
Stability is insufficient.
Chinese patent application, application number 201610246209.5, publication date on July 27th, 2016 disclose a kind of grid-connected
The smooth method of type micro-capacitance sensor dominant eigenvalues, is dispatched using dual-layer optimization；The dual-layer optimization scheduling includes based on prediction number
Optimize according to the upper layer for optimizing scheduling, and is optimized according to the lower layer that collected real time data carries out real-time control.This hair
The Optimized Operation mode of the bright double-deck control of application, can be realized the control of grid type micro-capacitance sensor dominant eigenvalues, controls interconnection
The fluctuation of power is no more than specified range, prevents dominant eigenvalues because biggish fluctuation occurs in the unstability of photovoltaic power generation,
Influence after reduction micro-capacitance sensor access bulk power grid to bulk power grid stability.By reducing the fluctuation of interconnection, big electricity can be improved
The capacity of net access photovoltaic, improves the utilization rate of clean energy resource.By the control to energy-storage battery electricity, battery mistake can be prevented
It fills or over-discharge, is able to extend the service life of energy-storage battery.But this scheme response speed is slack-off, and the fluctuation reached reaches certain
Value just will start, and in high standard power grid, influence big.
Chinese patent application, application number 201310234708.9 publication date on September 25th, 2013, disclose a kind of new energy
The smooth control method and device of the grid-connected dominant eigenvalues in source judge fluctuation frequency range when power grid fluctuates, utilize
Cooperation between energy-storage battery and combustion engine compensates the ripple components of different frequency range in new energy output power, fills
Divide and existing new energy form is utilized, avoids putting into more equipment, improve the utilization rate of the energy, customer power supply demand is same meeting
When reduce bulk power grid and again build；Cold heat comprising light-preserved system/chp system structure is simple, Yi Shixian；And run mould
Formula multiplicity, can play effect of integrated pest management to power quality, and the power quality improvement particularly with remote districts becomes apparent.But
In this scheme, energy-storage system uses basic filtering control method, does not consider the state-of-charge of battery, on the one hand will affect electricity in this way
There are big ups and downs, influence grid stability in the service life in pond, the power that on the other hand will lead to injection power grid.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides one kind to have response fast, and scheme is simple, and stability is good
Effect micro-grid connection dominant eigenvalues control system and its method.
The purpose of the present invention is achieved through the following technical solutions.
A kind of control system of micro-grid connection dominant eigenvalues, including distributed generation resource, load and energy-storage units, it is described
Distributed generation resource, load and energy-storage units are connect with control unit respectively, and the distributed generation resource, load and energy-storage units pass through
Points of common connection is connect with external electrical network, and the interface of the distributed generation resource and energy-storage units is inverter, described commonly connected
Point and inverter are controlled by control unit to be opened and closed, and the energy-storage units are connected with battery management unit.
Further, the load governor, power-supply controller of electric, energy storage controller by communication bus upload load, point
Cloth power supply, energy-storage units electric information give micro-capacitance sensor central controller；The micro-capacitance sensor central controller is total by communication
Line assigns command adapted thereto to lower layer's controller, controls the operation of load, distributed generation resource, energy-storage units.
Further, the distributed generation resource includes photo-voltaic power supply and wind-power electricity generation power supply.
Further, the points of common connection and inverter are opened and closed by remote control.
A kind of control method of the grid-connected dominant eigenvalues of micro-grid system, step include:
1) micro-capacitance sensor central controller acquires micro-capacitance sensor and each electrical quantity of interconnection, executes step 2) later；
2) according to the collected electrical quantity of step 1), judge agreement power PAgrWith micro-capacitance sensor net load PNetRelationship；Association
Discuss power PAgrPredicted value is provided by Energy Management System, if Energy Management System does not give value, agreement power PAgrValue
For micro-capacitance sensor net load power PNetThe Δ t time in average value, i.e.,Δ t=t-t0；
Work as PAgr> PNet, then by micro-capacitance sensor central controller transmitting order to lower levels to battery management system, adjust energy-storage units and go out
Power, energy-storage units power generating value are PB=PAgr-PNet；
Work as PAgr≤PNet, then energy-storage units are stopped by micro-capacitance sensor central controller transmitting order to lower levels to battery management system and gone out
Power, energy-storage units start to charge, later return step 1).
Further, in the step 1), micro-capacitance sensor central controller acquires micro-capacitance sensor and each electrical quantity of interconnection, including
Total active-power P that distributed generation resource issuesDG, local load active-power PLoad, the net load power P of micro-capacitance sensorNet；
PNet=PLoad-PDG
Total active-power P of energy storage firstB；The dominant eigenvalues P of micro-capacitance sensorGrid:
PGrid=PLoad-PDG-PB。
Further, in the step 2) the charge and discharge time of energy-storage system and value be positively correlated, energy-storage system
Charge and discharge electric frequency and value it is negatively correlated, distributed generation resource power output stability bandwidth and value it is negatively correlated.
Compared with the prior art, the present invention has the advantages that
1) the present invention relates to containing wind, light, store up the micro-capacitance sensor of distributed power supply when being incorporated into the power networks dominant eigenvalues it is flat
Sliding control method, the control method is according to each distributed generation resource power output of collected micro-capacitance sensor, local load power, interconnection function
Rate calculates the stability bandwidth of dominant eigenvalues when being incorporated into the power networks in real time, formulates the charge and discharge strategy of energy-storage system, the controlling party accordingly
Method can stabilize the fluctuation of micro-grid connection motion time cloth power supply, ensure that reliability, the stability of micro-capacitance sensor；
2) one kind introduces tie line plan power P when being incorporated into the power networksAgr, provided by Energy Management System (EMS)
Predicted value, if Energy Management System (EMS) does not give value, value is micro-capacitance sensor net load power PNetWithin the Δ t time
Average value totally realizes compensation for power grid according to tie line plan power, charges and discharges, realize micro-capacitance sensor and major network
Between exchange power smooth variation, stabilize the fluctuation of distributed generation resource in micro-capacitance sensor, while realizing the purpose of peak load shifting；
3) this programme distributed generation resource can there are many, include but is not limited to wind-power electricity generation, photovoltaic power generation etc., may be implemented
Wind light mutual complementing improves the economy, the feature of environmental protection and reliability of power supply；
4) interface of the inverter as distributed generation resource and energy-storage system is used, the flexible and dynamic of micro-capacitance sensor is effectively increased
State property energy；It is related to plurality of operating modes, mode operation multiplicity, good compatibility；
5) in peak times of power consumption, unscheduled power PAgrGreater than the net load power of micro-capacitance sensor, energy storage device electric discharge；In electricity consumption
Trough period, unscheduled power PAgrLess than the net load power of micro-capacitance sensor, energy storage device charging sufficiently plays the work of peak load shifting
With.
Detailed description of the invention
Fig. 1 is micro-capacitance sensor structural schematic diagram of the invention；
Fig. 2 is micro-capacitance sensor central controller schematic diagram；
Fig. 3 is micro-capacitance sensor control strategy flow chart；
Fig. 4 is that power load optimizes front and back load chart.
Specific embodiment
With reference to the accompanying drawings of the specification and specific embodiment, the present invention is described in detail.
The present invention relates to containing wind, light, store up distributed power supply micro-capacitance sensor when being incorporated into the power networks dominant eigenvalues it is smooth
Control method, the control method is according to each distributed generation resource power output of collected micro-capacitance sensor, local load power, interconnection function
Rate calculates the stability bandwidth of dominant eigenvalues when being incorporated into the power networks in real time, formulates the charge and discharge strategy of energy-storage system accordingly.The controlling party
Method can stabilize the fluctuation of micro-grid connection motion time cloth power supply, ensure that reliability, the stability of micro-capacitance sensor.
Existing micro-grid connection there are aiming at the problem that, the object of the present invention is to provide one kind when being incorporated into the power networks,
It realizes the smooth variation for exchanging power between micro-capacitance sensor and major network, stabilizes the fluctuation of distributed generation resource in micro-capacitance sensor, realize simultaneously
The purpose of peak load shifting.As shown in Figure 1, micro-grid system includes several wind-driven generators, solar panel, battery equal part
Power supply, energy-storage system and the relevant load structure of cloth by PCC (points of common connection) control switch, and are connected to outer
In the power grid in portion.
As shown in Fig. 2, a kind of micro-grid system when being incorporated into the power networks, including control layer, monitor layer, communication layers, control layer
It is made of micro-capacitance sensor central controller (MGCC) and each lower layer's controller, lower layer's controller includes load governor, power supply control
Device, energy storage controller；Monitor layer is made of monitoring devices such as current transformer, voltage transformer, power meters；Monitor layer and control
Layer connection, lower layer's controller are communicated with MGCC by communication layers.MGCC and load governor, power-supply controller of electric, energy storage controller
It is attached by communication bus；Load governor, power-supply controller of electric, energy storage controller upload load by communication bus, divide
Cloth power supply, energy-storage system electric information to MGCC；MGCC assigns command adapted thereto to lower layer's controller by communication bus, with
Control the operating status of load, distributed generation resource, energy-storage system.
As shown in figure 3, the main flow chart of dominant eigenvalues smooth control method, detailed process is analyzed as follows shown:
1) micro-capacitance sensor and each electrical quantity acquisition of interconnection.It specifically includes:
1. the electric current on interconnection；
2. the busbar voltage of micro-capacitance sensor；
3. the electric current of each power circuit；
4. the electric current of each charge circuit.
2) according to the collected electrical quantity of step 1), unscheduled power P is judged by MGCCAgrWith micro-capacitance sensor net load PNetPass
System.
1. if PAgr> PNet, then by MGCC transmitting order to lower levels to battery management system (BMS), energy-storage system power output is adjusted,
Energy-storage system power generating value is PB=PAgr-PNet；
2. if PAgr≤PNet, then energy-storage system power output, storage are stopped by MGCC transmitting order to lower levels to battery management system (BMS)
Energy system starts to charge.
3) return step 1).
In the step 2), the charge and discharge time of energy-storage system and the value of Δ t are positively correlated, the charge and discharge of energy-storage system
Frequency and the value of Δ t are negatively correlated, and the value of the stability bandwidth and Δ t of distributed generation resource power output is negatively correlated.The value shadow of Δ t
It rings the charge and discharge time to energy-storage system, charge and discharge electric frequency, the stability bandwidth that value should contribute according to distributed generation resource considers.Generally
The value on ground, Δ t can be chosen according to following table.
1 Δ t value table of table
| Distributed generation resource stability bandwidth | N < 10% | 10%≤n < 30% | 30%≤n |
| Δ t/ minutes | 30 | 20 | 10 |
A kind of micro-grid connection run when dominant eigenvalues smooth control method the following steps are included:
1) micro-capacitance sensor central controller (MGCC) acquisition micro-capacitance sensor and each electrical quantity of interconnection obtain distributed generation resource sending
Total active-power PDG, local load active-power PLoad, the net load power P of micro-capacitance sensorNet；
PNet=PLoad-PDG (1)
2) micro-capacitance sensor central controller (MGCC) is communicated with battery management system (BMS), obtains the total active of energy-storage system
Power PB；
3) to obtain exchange power of the micro-grid system with external electrical network, i.e. the dominant eigenvalues P of micro-capacitance sensorGrid:
PGrid=PLoad-PDG-PB (2)
4) since the intermittence of distributed generation resource and fluctuation and micro-capacitance sensor local load have biggish peak-valley difference special
Property, leading to micro-grid connection interconnection, there are relatively high power fluctuations.In order to stabilize fluctuation, tie line plan power P is introducedAgr, by
Energy Management System (EMS) provides predicted value, if Energy Management System (EMS) does not give value, value is that micro-capacitance sensor is born only
Lotus power PNetAverage value in certain time；
By taking the power load on July 1st, 2013 of somewhere as an example, as shown in figure 4, solid line is same day realized load curve in figure,
Dotted line is using the optimization load curve after strategy.As seen from the figure, when peak of power consumption in the afternoon, load fluctuation is larger, draws
With after this strategy, significantly reducing load peak, and power network fluctuation is stabilized.
In order to further describe optimization of this strategy to former daily load curve, virgin curve and Optimal Curve are taken a little respectively,
Point sampling method are as follows: since 0 point, taken a bit every 15min, be divided into and do not take 96 point datas.Every group of discrete data is carried out discrete
Variance and standard deviation evaluation, as a result see the table below:
Table 1
The variance and standard deviation of daily load curve after optimization are smaller than former daily load curve, it follows that after optimization
The more former daily load curve of dispersion degree and degree of fluctuation of daily load curve is smaller.
5) the control target of the smooth control method of dominant eigenvalues is by interconnection when a kind of micro-grid connection is run
Power PGridBy the net load P of the micro-grid system before introducing energy storageNetCompensation is preset unscheduled power PAgr。
PAgr=PB+PNet (3)
6) by formula (3) it is found that working as unscheduled power PAgrGreater than the net load P of micro-grid systemNetWhen, energy-storage system adjusts out
Power is PB, as unscheduled power PAgrLess than the net load P of micro-grid systemNetWhen, energy-storage system charges.
Micro-capacitance sensor in the step 1) includes photovoltaic (Solar Photovoltaic, PV), wind-power electricity generation (Wind
TurbineGeneration, WG), energy storage device (Storage Battery, SB), as shown in Figure 1, may be implemented it is honourable mutually
It mends, improves the economy, the feature of environmental protection and reliability of power supply, meanwhile, using inverter as distributed generation resource and energy-storage system
Interface effectively increases the flexibility and dynamic property of micro-capacitance sensor；It is related to plurality of operating modes, including the mode that is incorporated into the power networks, isolated island
Operational mode, it is grid-connected turn island mode, isolated island turns grid-connect mode etc..
Micro-capacitance sensor central controller (MGCC) can carry out the acquisition of multi-analog, switching value in the step 1), and with
Energy Management System (EMS), battery management system (BMS) are communicated, and can be carried out the remote control operation of switch；Built-in expert system
Program carries out real-time reception, processing, forwarding to data, as shown in Figure 2.
In the step 4), it is contemplated that the characteristic of power load, electricity consumption duration of peak value are about 30min, and stability bandwidth is small
In 10%, PAgrValue is PNet30min average value.
In the step 6), the charging and discharging state and power output situation of energy-storage system are counted by micro-capacitance sensor central controller (MGCC)
It obtains, after being issued to battery management system (BMS), energy storage device is controlled by battery management system (BMS).
The present invention is with micro-capacitance sensor net load power PNetAverage value and Energy Management System (EMS) in certain time is given
Planned value be foundation, by control energy storage device power output, effectively stabilize the distributed generation resource of micro-capacitance sensor intermittence and
Fluctuation improves the reliability of micro-capacitance sensor, reduces impact of the micro-capacitance sensor to power grid.Meanwhile in peak times of power consumption, plan function
Rate PAgrGreater than the net load power of micro-capacitance sensor, energy storage device electric discharge；In the low power consumption phase, unscheduled power PAgrLess than micro-capacitance sensor
Net load power, energy storage device charging, sufficiently plays the role of peak load shifting.Complete the grid-connected smooth control to micro-grid system
System.
Claims (7)
1. a kind of control system of micro-grid connection dominant eigenvalues, including distributed generation resource, load and energy-storage units, feature
It is that the distributed generation resource, load and energy-storage units are connect with control unit respectively, the distributed generation resource, load and energy storage
Unit is connect by points of common connection with external electrical network, and the interface of the distributed generation resource and energy-storage units is inverter, described
Points of common connection and inverter are controlled by control unit to be opened and closed, and the energy-storage units are connected with battery management unit.
2. a kind of control system of micro-grid connection dominant eigenvalues according to claim 1, it is characterised in that described negative
Lotus controller, power-supply controller of electric, energy storage controller by communication bus upload load, distributed generation resource, energy-storage units it is electrical
Information gives micro-capacitance sensor central controller；The micro-capacitance sensor central controller assigns corresponding finger to lower layer's controller by communication bus
It enables, controls the operation of load, distributed generation resource, energy-storage units.
3. a kind of control system of micro-grid connection dominant eigenvalues according to claim 1, it is characterised in that described point
Cloth power supply includes photo-voltaic power supply and wind-power electricity generation power supply.
4. a kind of control system of micro-grid connection dominant eigenvalues according to claim 1, it is characterised in that the public affairs
Tie point and inverter are opened and closed by remote control altogether.
5. a kind of control method of the grid-connected dominant eigenvalues of micro-grid system, it is characterised in that step includes:
1) micro-capacitance sensor central controller acquires micro-capacitance sensor and each electrical quantity of interconnection, executes step 2) later；
2) according to the collected electrical quantity of step 1), judge agreement power PAgrWith micro-capacitance sensor net load PNetRelationship；Agreement function
Rate PAgrPredicted value is provided by Energy Management System, if Energy Management System does not give value, agreement power PAgrValue is micro-
Power grid net load power PNetThe Δ t time in average value, i.e.,Δ t=t-t0；
Work as PAgr> PNet, then by micro-capacitance sensor central controller transmitting order to lower levels to battery management system, energy-storage units power output, storage are adjusted
Energy unit power generating value is PB=PAgr-PNet；
Work as PAgr≤PNet, then energy-storage units power output, storage are stopped by micro-capacitance sensor central controller transmitting order to lower levels to battery management system
Energy unit starts to charge, later return step 1).
6. according to a kind of control method of the grid-connected dominant eigenvalues of micro-grid system of claim 5, it is characterised in that the step
1) in, micro-capacitance sensor central controller acquires micro-capacitance sensor and each electrical quantity of interconnection, the total wattful power issued including distributed generation resource
Rate PDG, local load active-power PLoad, the net load power P of micro-capacitance sensorNet；
PNet=PLoad-PDG
Total active-power P of energy-storage systemB；The dominant eigenvalues P of micro-capacitance sensorGrid:
PGrid=PLoad-PDG-PB。
7. according to a kind of control method of the grid-connected dominant eigenvalues of micro-grid system of claim 5, it is characterised in that the step
2) in the charge and discharge time of energy-storage system and value be positively correlated, the charge and discharge electric frequency of energy-storage system and value be in negative
Close, distributed generation resource power output stability bandwidth per minute and value it is negatively correlated.
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| PCT/CN2018/086243 WO2019148689A1 (en) | 2018-02-01 | 2018-05-10 | Grid-connected tie-line power control system of micro-grid and method thereof |
| AU2018102183A AU2018102183A4 (en) | 2018-02-01 | 2018-05-10 | Grid-connected tie-line power control system of micro-grid and method thereof |
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| CN110516982B (en) * | 2019-09-20 | 2022-05-31 | 中国电力工程顾问集团西北电力设计院有限公司 | Method for calculating multi-energy complementary capability index of inter-provincial power grid |
| CN110601223A (en) * | 2019-09-30 | 2019-12-20 | 西安特锐德智能充电科技有限公司 | Power adjusting method and device, electronic equipment and storage medium |
| CN110601223B (en) * | 2019-09-30 | 2021-08-10 | 西安特锐德领充新能源科技有限公司 | Power adjusting method and device, electronic equipment and storage medium |
| CN115395570A (en) * | 2022-09-20 | 2022-11-25 | 国网浙江省电力有限公司嘉兴供电公司 | Autonomous-cooperative control system and control method for area of smart microgrid |
Also Published As
| Publication number | Publication date |
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| WO2019148689A1 (en) | 2019-08-08 |
| AU2018102183A4 (en) | 2020-10-08 |
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