CN108599201A - A kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method - Google Patents
A kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method Download PDFInfo
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- CN108599201A CN108599201A CN201810577906.8A CN201810577906A CN108599201A CN 108599201 A CN108599201 A CN 108599201A CN 201810577906 A CN201810577906 A CN 201810577906A CN 108599201 A CN108599201 A CN 108599201A
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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
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation methods：Configure energy storage to (VF) energy storage of electric voltage frequency type and power-type (PQ) energy storage two parts；Tuning controller acquisition system frequency, and communicated by high-speed bus and energy storage；Judge what section is system frequency be located at, control strategy is provided according to different sections；And accumulation power supply is shifted by PQ accumulation power supplies and is contributed.The present invention control method can reasonable distribution energy storage contribute, PQ accumulation power supplies normal condition can be used for generate economic benefit, the stabilization of maintenance system is can be used for when VF accumulation power supplies are close to Operation at full power situation；And the working environment of VF accumulation power supplies can be optimized, it prevents from causing VF power supplys to be stopped extremely because of electricity；In the case where maintaining off-network micro-grid system economic benefit, the stability of system is improved, is suitble to practical engineering application.
Description
Technical field
The invention belongs to micro-capacitance sensor technical fields, and in particular to a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method.
Background technology
Large capacity off-network type micro-capacitance sensor often configures the energy storage of larger capacity, needs to configure more energy accumulation current converter PCS, therefore
The case where there are more PCS paired runnings.If all PCS are all made of VF operational modes, control parameter is adjusted more difficulty, is more easily led
Underdamping is caused, is vibrated so as to cause multi-computer system, therefore there are hidden danger to system stable operation.Meanwhile the control of off-network type microgrid
Target processed is economy to be improved under the premise of ensuring system stability, and VF energy storage can not generate direct economic benefit, because
This, large capacity off-network type micro-capacitance sensor often configures a part of storage energy operation in PQ patterns, and another part runs on VF patterns.
The problem of above-mentioned allocation plan, is, in the case where cost of investment is constant, VF accumulation power supplies capacity is compressed, and is being answered
VF power supplys output can exceed that rated power when big to some load disturbance, cause the controlling unit of VF power supplys to be saturated, cause
System voltage frequency substantially vibrates, and then causes the electric voltage frequency protection act of PCS, eventually leads to system crash.Meanwhile if being
System one stable big load of input, then output is to give the load to power for a long time for VF power supplys, under causing VF electric quantity of power supply to continue
Drop, eventually leads to VF power supplys and is stopped because electricity is low, system crash.
Chinese Patent Application No. CN201310346399.4,2013 applyings date August 9 days, publication number CN103414186A,
Publication date on November 27th, 2013, the distributed-type frequency modulation based on inverter under a kind of entitled microgrid off-network pattern,
The invention discloses under a kind of microgrid off-network pattern using power generation and energy-storage system inverter distributed-type frequency modulation, at microgrid
When off-network pattern, the output power of the inverter of each electricity generation system and energy-storage system changes with system frequency and is become in microgrid
Change, to ensure off-grid operation micro-grid system frequency departure within the acceptable range.Energy-storage system is used in the invention
System frequency modulation, but the economic benefit of energy storage is not considered.
Chinese Patent Application No. CN201410608218.5, November 03 2014 applying date, publication number
CN104300583B, publication date on 08 31st, 2016, it is entitled it is a kind of meter and equipment governing response characteristic microgrid frequency
The microgrid control method for frequency of a kind of meter of rate control method and equipment governing response characteristic, microgrid the off-grid operation during,
Energy storage battery, diesel-driven generator, Energy Management System and microgrid stabilization control device measuring unit synchronize detecting system frequency,
And carry out judging whether its deviation out-of-limit, if the deviation of system frequency is more than definite value, energy storage battery will carry out charge/discharge, real
Existing microgrid primary frequency modulation, systems stabilisation frequency, Energy Management System is by the discharge time of Simultaneous Monitoring energy-storage battery, when energy storage electricity
Pond continuous discharging time exceeds definite value, and it is defeated to adjust its power to diesel-driven generator for the regulating command of Energy Management System output power
Go out, realize microgrid frequency modulation frequency modulation, when the microgrid frequency deviation duration being more than definite value, microgrid stabilization control device cuts startup
Load or wind turbine, diesel-driven generator logic, until microgrid frequency restores normal.Invention use judges the method for discharge time simultaneously
It is unreasonable, because discharge time can not represent discharge power, Secondary Control equipment frequent starting may be caused, be unfavorable for improving
The economy of system.
In conclusion need to propose a kind of new microgrid control method for frequency, it can be in the premise for maintaining system stability
Under increase economic efficiency.
Invention content
The purpose of the present invention is to provide a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method, be suitable for containing big
Capacity energy storage, photovoltaic and other intermittent power supplys off-grid system, economic imitate is improved under the premise of maintaining system stability
Benefit.
In order to achieve the above objectives, solution of the invention is：A kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation side
Method configures accumulation power supply to electric voltage frequency type VF accumulation power supplies and power-type PQ accumulation power supply two parts；Tuning controller is adopted
Collecting system frequency, and communicated with accumulation power supply, judge what section is system frequency be located at, control strategy is provided according to different sections；
And accumulation power supply is shifted by PQ accumulation power supplies and is contributed；System loading fluctuates hour by VF accumulation power supply frequency modulation, PQ accumulation power supplies
Economical operation；When system loading fluctuation is larger, PQ accumulation power supplies are promptly contributed, and the frequency of system is maintained.
Further, it is delayed by setting after VF accumulation power supplies are contributed, the VF accumulation power supplies calculated in setting time are contributed
Average value, and adjust PQ accumulation power supplies accordingly and contribute.
Further, the method specifically comprises the following steps：
Step 1：Tuning controller acquisition system frequency, and communicated with energy storage；
Step 2：System frequency is judged, when system frequency is in (fliml, flimh) except when, cut machine-cut load；Otherwise, enter
Step 3；Wherein, flimlIndicate the limit inferior of system frequency, flimhIndicate the limes superiors of system frequency；
Step 3：When system frequency is in (fdbl, fdbh) except when, VF accumulation power supplies go out the frequency of draught control system；If VF is stored up
The charge-discharge electric power of energy power supply is more than kPvfN, PQ accumulation power supplies additional issue output Δ Ppq, participate in the adjusting of system frequency；Wherein, fdbl
Indicate deadband lower limit frequency, fdbhIndicate that deadband upper limit frequency, k indicate that proportionality coefficient, interval are (0,1), PvfNIndicate VF
The rated power of accumulation power supply.
Further, the method further includes step 4：By T after VF accumulation power supplies output2Delay calculates T2In time
Compensation power Ppqcomp, and adjust PQ accumulation power supplies accordingly and contribute.
Further, the tuning controller is communicated by high-speed bus and energy storage.
Further, the high-speed bus includes GOOSE, CAN bus.
Further, tuning controller configures one or two according to stored energy capacitance size in the step 1；If energy storage
Capacity is larger, it is proposed that configuration two；In the case of configuration two, one controls VF accumulation power supplies for coordinating, and another is used for
Coordinate control PQ accumulation power supplies.
Further, PQ accumulation power supplies additional issue output Δ P in the step 3pqIt is calculated with reference to following formula：
In formula,
PpqNFor the rated power of PQ accumulation power supplies, k1For coefficient of frequency modulation, interval is (0,1)；
The final output P of PQ accumulation power supplies in the step 3pqfinalIt is calculated with reference to following formula：
Ppqfinal=Δ Ppq+Ppqout
Wherein, PpqoutFor the current output power of PQ accumulation power supplies；Energy storage output power is that positive expression is put in the step 3
Electricity charges for negative indication.
Further, T in the step 42Compensation power P in timepqcompFor T2VF accumulation power supplies are contributed flat in time
Mean value is calculated with reference to following formula：
In formula,
PvfoutFor the instantaneous power of VF accumulation power supplies；N is tuning controller in T2Calculation times in time meet：
N=T2/tick
In formula, tick indicates the time interval that tuning controller calculates；
The final output P of PQ accumulation power supplies in the step 4pqfinalIt is calculated with reference to following formula：
In formula,
P1、P2Respectively T2The mean power lower and upper limit that VF accumulation power supplies allow in time.
Compared with the immediate prior art, the beneficial effects of the invention are as follows：
Battery system is divided into VF accumulation power supplies and PQ accumulation power supplies, system loading fluctuates hour by VF accumulation power supply tune
Frequently, PQ accumulation power supplies economical operation.When system loading fluctuation is larger, PQ accumulation power supplies are promptly contributed, and the frequency of system is maintained；
Further, in order to which that improves PQ accumulation power supplies goes out force response rate, it is proposed that by the way of high-speed bus, by communication delay
It is limited in Millisecond.And mean power compensation way is used, the output in the sources transfer VF maintains the electricity in the sources VF.The present invention is applicable in
It in large-scale off-network type microgrid, can increase economic efficiency under the premise of maintaining system stability, be suitble to practical engineering application.
Description of the drawings
Fig. 1 is a kind of flow chart of large capacity off-network type micro-capacitance sensor mixing frequency modulation method.
Fig. 2 is mixing frequency modulation system communication framework.
Fig. 3 is mixing frequency modulation schematic diagram.
Fig. 4 is the frequency modulation characteristic under different load fluctuation.
Fig. 5 is that PQ accumulation power supplies shift VF accumulation power supply power principle figures.
Specific implementation mode
Below with reference to attached drawing, technical scheme of the present invention is described in detail.
The invention discloses a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation methods, configure accumulation power supply to voltage frequency
Rate type VF accumulation power supplies and power-type PQ accumulation power supply two parts；Tuning controller acquisition system frequency, and it is logical with accumulation power supply
News, judge what section is system frequency be located at, control strategy are provided according to different sections；And energy storage electricity is shifted by PQ accumulation power supplies
It contributes in source；System loading fluctuates hour by VF accumulation power supply frequency modulation, PQ accumulation power supply economical operation；When system loading fluctuation is larger
When, PQ accumulation power supplies are promptly contributed, and the frequency of system is maintained.VF accumulation power supplies are delayed after contributing by setting, when calculating setting
Interior VF accumulation power supply output average values, and adjust PQ accumulation power supplies accordingly and contribute.The tuning controller passes through quickly total
Line is communicated with energy storage.The high-speed bus includes GOOSE, CAN bus.Tuning controller is according to stored energy capacitance in the step 1
Size configures one or two；If stored energy capacitance is larger, it is proposed that configuration two；In the case of configuration two, one for assisting
Regulation and control VF accumulation power supplies processed, another for coordinating control PQ accumulation power supplies.
A kind of embodiment of large capacity off-network type micro-capacitance sensor mixing frequency modulation method disclosed by the invention is as shown in Figure 1, specific
For：
(1) tuning controller acquisition system frequency, and communicated by high-speed bus and energy storage；Wherein, tuning controller can
To configure one or two according to actual conditions, if stored energy capacitance is larger, it is proposed that configuration two, one for coordinating control VF
Accumulation power supply, another for coordinating control PQ accumulation power supplies；In order to improve the corresponding speed of PQ accumulation power supplies, need using fast
Fast bus mode, may be used GOOSE CAN technologies, and communication structure is as shown in Figure 2.
(2) system frequency is judged, when system frequency is in (fliml, flimh) except when, cut machine-cut load；Otherwise, it enters step
3；Wherein, flimlIndicate the limit inferior of system frequency, flimhIndicate the limes superiors of system frequency.
(3) when system frequency is in (fdbl, fdbh) except when, VF accumulation power supplies go out the frequency of draught control system；If VF energy storage
The charge-discharge electric power of power supply is more than kPvfN, PQ accumulation power supplies additional issue output Δ Ppq, participate in the adjusting of system frequency；Wherein, fdblTable
Show deadband lower limit frequency, fdbhIndicate that deadband upper limit frequency, k indicate that proportionality coefficient, interval are (0,1), PvfNIndicate VF storages
The rated power of energy power supply, principle are as shown in Figure 3.
Wherein, PQ accumulation power supplies additional issue output Δ PpqIt is calculated with reference to following formula：
In formula,
PpqNFor the rated power of PQ accumulation power supplies, k1For coefficient of frequency modulation, interval is (0,1)；
The final output P of PQ accumulation power supplies in this steppqfinalIt is calculated with reference to following formula：
Ppqfinal=Δ Ppq+Ppqout
In formula, energy storage output power is that positive expression is discharged, and is charged for negative indication.
Frequency modulation characteristic under different load is as shown in figure 4, when Smaller load fluctuates, and PQ accumulation power supplies are according to economical operation；Greatly
When load fluctuation, PQ accumulation power supplies quickly participate in frequency modulation, maintain system frequency.
(4) by T after VF accumulation power supplies are contributed2Delay calculates T2Compensation power P in timepqcomp, and control PQ energy storage
Power supply is contributed, and principle is as shown in Figure 5.
Wherein T2Compensation power P in timepqcompFor T2VF accumulation power supplies output average value in time, with reference to following formula meter
It calculates：
In formula,
PvfoutFor the instantaneous power of VF accumulation power supplies；N is tuning controller in T2Calculation times in time meet：
N=T2/tick
In formula, tick indicates the time interval that tuning controller calculates；
The final output P of this step PQ accumulation power suppliespqfinalIt is calculated with reference to following formula：
In formula,
P1、P2Respectively T2The mean power lower and upper limit that VF accumulation power supplies allow in time.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (9)
1. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method, which is characterized in that configure accumulation power supply to electric voltage frequency
Type VF accumulation power supplies and power-type PQ accumulation power supply two parts；Tuning controller acquisition system frequency, and communicated with accumulation power supply,
Judge what section is system frequency be located at, control strategy is provided according to different sections；And accumulation power supply is shifted by PQ accumulation power supplies
It contributes；System loading fluctuates hour by VF accumulation power supply frequency modulation, PQ accumulation power supply economical operation；When system loading fluctuation is larger
When, PQ accumulation power supplies are promptly contributed, and the frequency of system is maintained.
2. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as described in claim 1, which is characterized in that VF energy storage electricity
Source is delayed after contributing by setting, calculates the VF accumulation power supply output average values in setting time, and adjusts PQ energy storage electricity accordingly
It contributes in source.
3. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as described in claim 1, which is characterized in that specifically include
Following steps：
Step 1：Tuning controller acquisition system frequency, and communicated with energy storage；
Step 2：System frequency is judged, when system frequency is in (fliml, flimh) except when, cut machine-cut load；Otherwise, it enters step
3；Wherein, flimlIndicate the limit inferior of system frequency, flimhIndicate the limes superiors of system frequency；
Step 3：When system frequency is in (fdbl, fdbh) except when, VF accumulation power supplies go out the frequency of draught control system；If VF energy storage electricity
The charge-discharge electric power in source is more than kPvfN, PQ accumulation power supplies additional issue output Δ Ppq, participate in the adjusting of system frequency；Wherein, fdblIt indicates
Deadband lower limit frequency, fdbhIndicate that deadband upper limit frequency, k indicate that proportionality coefficient, interval are (0,1), PvfNIndicate VF energy storage
The rated power of power supply.
4. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as claimed in claim 3, which is characterized in that the method
Further include
Step 4：By T after VF accumulation power supplies output2Delay calculates T2Compensation power P in timepqcomp, and PQ is adjusted accordingly
Accumulation power supply is contributed.
5. such as a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method of Claims 1-4 any one of them, feature exists
In：The tuning controller is communicated by high-speed bus and energy storage.
6. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as claimed in claim 5, it is characterised in that：It is described quick
Bus includes GOOSE, CAN bus.
7. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as claimed in claim 3, it is characterised in that：The step
Tuning controller configures one or two according to stored energy capacitance size in 1；In the case of configuration two, one for coordinating control
VF accumulation power supplies processed, another for coordinating control PQ accumulation power supplies.
8. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as claimed in claim 3, it is characterised in that：
PQ accumulation power supplies additional issue output Δ P in the step 3pqIt is calculated with reference to following formula：
In formula,
PpqNFor the rated power of PQ accumulation power supplies, k1For coefficient of frequency modulation, interval is (0,1)；
The final output P of PQ accumulation power supplies in the step 3pqfinalIt is calculated with reference to following formula：
Ppqfinal=Δ Ppq+Ppqout
Wherein, PpqoutFor the current output power of PQ accumulation power supplies；Energy storage output power is that positive expression is discharged in the step 3,
It charges for negative indication.
9. a kind of large capacity off-network type micro-capacitance sensor mixing frequency modulation method as claimed in claim 4, it is characterised in that：
T in the step 42Compensation power P in timepqcompFor T2VF accumulation power supplies output average value in time, with reference to following formula
It calculates：
In formula,
PvfoutFor the instantaneous power of VF accumulation power supplies；N is tuning controller in T2Calculation times in time meet：
N=T2/tick
In formula, tick indicates the time interval that tuning controller calculates；
The final output P of PQ accumulation power supplies in the step 4pqfinalIt is calculated with reference to following formula：
In formula,
P1、P2Respectively T2The mean power lower and upper limit that VF accumulation power supplies allow in time.
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| CN110401228A (en) * | 2018-12-14 | 2019-11-01 | 特变电工西安电气科技有限公司 | A kind of stable control method suitable for micro-capacitance sensor off-grid operation mode |
| CN111146802A (en) * | 2019-12-24 | 2020-05-12 | 上海电力大学 | Source-load cooperative auxiliary frequency modulation method suitable for high-proportion new energy micro-grid |
| CN112542843A (en) * | 2020-12-11 | 2021-03-23 | 南京南瑞继保工程技术有限公司 | Independent micro-grid rapid frequency modulation method |
| CN113872223A (en) * | 2021-11-15 | 2021-12-31 | 许继集团有限公司 | Frequency modulation method and device for regional-level hundred-percent new energy power system |
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| CN111146802B (en) * | 2019-12-24 | 2021-05-04 | 上海电力大学 | Source-load cooperative auxiliary frequency modulation method suitable for high-proportion new energy micro-grid |
| CN112542843A (en) * | 2020-12-11 | 2021-03-23 | 南京南瑞继保工程技术有限公司 | Independent micro-grid rapid frequency modulation method |
| CN112542843B (en) * | 2020-12-11 | 2022-08-26 | 南京南瑞继保工程技术有限公司 | Independent micro-grid rapid frequency modulation method |
| CN113872223A (en) * | 2021-11-15 | 2021-12-31 | 许继集团有限公司 | Frequency modulation method and device for regional-level hundred-percent new energy power system |
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Application publication date: 20180928 |