CN104362658A - Energy type and power type hybrid energy storage coordination control method - Google Patents
Energy type and power type hybrid energy storage coordination control method Download PDFInfo
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- CN104362658A CN104362658A CN201410686194.5A CN201410686194A CN104362658A CN 104362658 A CN104362658 A CN 104362658A CN 201410686194 A CN201410686194 A CN 201410686194A CN 104362658 A CN104362658 A CN 104362658A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The invention discloses an energy type and power type hybrid energy storage coordination control method. A power type energy storage device follows the principle of priority response. Short-term fluctuation with high fluctuation frequency and large fluctuation amplitude is adjusted, and long time fluctuation with a long fluctuation period and high adjusting capacity is adjusted under the condition of meeting the main aim of a micro-grid constructer to the greatest extent. The service life of a hybrid energy storage system is ensured, distributed renewable energy is fully utilized, electric energy waste of the renewable energy including wind and light is avoided while the power supplying reliability is ensured, the utilization rate of the renewable energy is increased, and good application prospects are achieved.
Description
Technical field
The present invention relates to Distributed Power Generation field, be specifically related to a kind of energy type and power-type hybrid energy-storing control method for coordinating.
Background technology
The output characteristic of the distributed power source of the regenerative resource such as wind power generation and photovoltaic generation, by the impact of natural cause, has randomness, fluctuation, after being incorporated into the power networks, has a negative impact to electrical network.Energy storage technology just in time can make up the deficiency of the distributed power source of regenerative resource, and energy storage is divided into energy type and power-type according to its feature such as response speed, regulating power.The short-term fluctuation that, fluctuating range high for vibration frequency is large, should adopt power-type energy storage to regulate; The fluctuation of the long period long for period of waves, pondage is large, should adopt energy type energy storage to regulate; Distributed power source due to regenerative resource has the feature of two kinds of fluctuations, therefore, applied energy type/power-type hybrid energy-storing carries out cooperation control, and common hybrid energy-storing form has different batteries combination, storage battery/super capacitor, storage battery/superconducting energy storage etc.
At present, existing micro-capacitance sensor energy storage scheduling strategy, dispatches the micro-capacitance sensor containing common load, that is: real-time judge line voltage and mains frequency, according to frequency departure dynamic dispatching energy storage energy, frequency fluctuation amplitude and the aggravation of customer service system hunting of frequency can be reduced; And according to generating electricity and workload demand situation, energy type energy storage charge state judges energy storage discharge and recharge operational mode, at present, in micro-capacitance sensor adopt energy-storage battery that price is lower as the balance of photovoltaic generation and load, and there is serious impact in the life-span of deep discharge on battery more.
China Patent No. 201020624601 discloses a kind of battery energy storage monitoring scheduling system, the electrical network prediction that the electrical network prediction that Dispatching Control System generates according to network load prognoses system generates and the every terms of information that battery energy storage supervisory control system sends, judge charge and discharge mode, and order is sent to electrical network connecting system and battery management system, control energy-storage battery group by electrical network connecting system access electrical network, and by after transformer substation system transformation, discharge and recharge operation is carried out with electrical network, if this method is for the micro-capacitance sensor containing rotary load, require that energy-storage battery has enough large capacity, affect its economy,
China Patent No. CN201410124542, hybrid energy-storing micro-grid system cut-off frequency defining method and output power control method, for the power output amplitude fluctuations that existing hybrid energy-storing micro-grid system utilizes method of exhaustion determination cut-off frequency to bring, the deficiency of the aspects such as adaptability is poor, Empirical mode decomposition is utilized micro battery power output to be decomposed into the component of different instantaneous frequency grade, thus obtain best cut-off frequency mains side power output being carried out to height frequency division, according to independent micro-grid output power smoothness index dynamic conditioning cut-off frequency, and control microgrid power output according to the cut-off frequency of dynamic conditioning, its control mode is too complicated, processing time is long, inconvenient adjustment in real time, grid stability is not good.
Summary of the invention
Technical problem solved by the invention overcomes the deficiency to energy type and power-type hybrid energy-storing cooperation control in prior art.Energy type of the present invention and power-type hybrid energy-storing control method for coordinating, effectively can ensure the stabilization of power grids, and effectively improve energy-storage system useful life, make full use of distribution type renewable energy, the waste of wind, light regenerative resource electric energy is avoided while ensureing power supply reliability, improve the utilance of regenerative resource, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of energy type and power-type hybrid energy-storing control method for coordinating, it is characterized in that: mixed energy storage system, comprise power-type energy storage device and energy type energy storage device, concrete control method, comprises the following steps,
Step (1), judges the size of distributed power source power output and system load demand power in micro-capacitance sensor, if when distributed power source power output is greater than system load demand power, performs step (2); If when distributed power source power output is less than system load demand power, perform step (6);
Step (2), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (3); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (4); If during the maximum of power-type energy storage carrying capacity state-of-charge SOC1 higher than its state-of-charge, perform step (5);
Step (3), control system excision energy type energy storage device, and in invariable power mode, power-type energy storage device is charged, consume the difference that distributed power source power output is greater than system load demand power, until when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (4);
Step (4), control system is charged to energy type energy storage device, and charge according to the maximum charge power of energy type energy storage device, consume the difference that distributed power source power output is greater than system load demand power, until during the maximum of power-type energy storage carrying capacity state-of-charge SOC1 higher than its state-of-charge, perform step (5);
Step (5), control system excision power-type energy storage device, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, if during the maximum of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, energy type energy storage continues charging; If during the maximum of energy type energy storage carrying capacity SOC2 higher than its state-of-charge, control system excision energy type energy storage device, consume the difference that distributed power source power output is greater than system load demand power, unnecessary electricity is incorporated to micro-capacitance sensor when running by micro-grid connection, if micro-capacitance sensor is in from network operation, cut-out distributed generation unit;
Step (6), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (7); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (8); If during minimum value simultaneously lower than its state-of-charge of rate type energy storage carrying capacity SOC1 and energy type energy storage carrying capacity SOC2, the difference of cloth output power of power supply and system load demand power, by micro-capacitance sensor polishing;
Step (7), control system excision power-type energy storage device, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, if during the minimum value of energy type energy storage carrying capacity SOC2 higher than its state-of-charge, control system controls its electric discharge, fills up distributed power source power output and system load demand power difference; If during the minimum value of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, the difference of distributed power source power output and system load demand power, by micro-capacitance sensor polishing;
Step (8), control system controls power-type energy storage device and externally discharges, fill up distributed power source power output and system load demand power difference, if cannot power difference be filled up, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, control system controls its electric discharge, fills up distributed power source power output and system load demand power difference; If during the minimum value of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, the difference of distributed power source power output and system load demand power, by micro-capacitance sensor polishing.
The invention has the beneficial effects as follows: energy type of the present invention and power-type hybrid energy-storing control method for coordinating, when meeting micro-capacitance sensor builder main purpose as far as possible, not only have adjusted the short-term fluctuation that vibration frequency is high, fluctuating range is large, have adjusted again the fluctuation of the long period that period of waves is long, pondage is large, ensure that the useful life of mixed energy storage system, make full use of distribution type renewable energy, the waste of wind, light regenerative resource electric energy is avoided while ensureing power supply reliability, improve the utilance of regenerative resource, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system block diagram of micro-capacitance sensor electricity generation system of the present invention.
Fig. 2 is the logic diagram of mixed energy storage system charge and discharge control of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, micro-capacitance sensor electricity generation system comprises blower fan, photovoltaic module, energy type energy storage device, power-type energy storage device, inverter, microgrid energy management system (control system), when carrying out mixed energy storage system, mixed energy storage system, comprises power-type energy storage device and energy type energy storage device, energy type of the present invention and power-type hybrid energy-storing control method for coordinating, power-type energy storage device is adopted to follow the principle of preferential answering, concrete control method, comprises the following steps
Step (1), judges the size of distributed power source power output and system load demand power in micro-capacitance sensor, if when distributed power source power output is greater than system load demand power, performs step (2); If when distributed power source power output is less than system load demand power, perform step (6);
Step (2), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (3); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (4); If during the maximum of power-type energy storage carrying capacity state-of-charge SOC1 higher than its state-of-charge, perform step (5);
Step (3), control system excision energy type energy storage device, and in invariable power mode, power-type energy storage device is charged, consume the difference that distributed power source power output is greater than system load demand power, until when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (4);
Step (4), control system is charged to energy type energy storage device, and charge according to the maximum charge power of energy type energy storage device, consume the difference that distributed power source power output is greater than system load demand power, until during the maximum of power-type energy storage carrying capacity state-of-charge SOC1 higher than its state-of-charge, perform step (5);
Step (5), control system excision power-type energy storage device, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, if during the maximum of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, energy type energy storage continues charging; If during the maximum of energy type energy storage carrying capacity SOC2 higher than its state-of-charge, control system excision energy type energy storage device, consume the difference that distributed power source power output is greater than system load demand power, unnecessary electricity is incorporated to micro-capacitance sensor when running by micro-grid connection, if micro-capacitance sensor is in from network operation, answer cut-out distributed generation unit;
Step (6), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (7); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (8);
Step (6), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (7); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (8); If during minimum value simultaneously lower than its state-of-charge of rate type energy storage carrying capacity SOC1 and energy type energy storage carrying capacity SOC2, the difference of cloth output power of power supply and system load demand power, by micro-capacitance sensor polishing;
Step (7), control system excision power-type energy storage device, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, if during the minimum value of energy type energy storage carrying capacity SOC2 higher than its state-of-charge, control system controls its electric discharge, fills up distributed power source power output and system load demand power difference; If during the minimum value of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, the difference of distributed power source power output and system load demand power, by micro-capacitance sensor polishing;
Step (8), control system controls power-type energy storage device and externally discharges, fill up distributed power source power output and system load demand power difference, if cannot power difference be filled up, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, control system controls its electric discharge, fills up distributed power source power output and system load demand power difference; If during the minimum value of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, the difference of distributed power source power output and system load demand power, by micro-capacitance sensor polishing.
Adopt a specific embodiment of energy type of the present invention and power-type hybrid energy-storing control method for coordinating, for ultracapacitor (power-type energy storage device) and storage battery (energy type energy storage carrying capacity), with the state-of-charge SOC of ultracapacitor
sCfor foundation formulates charge and discharge control strategy, if maximum, the minimum value of the state-of-charge of ultracapacitor are respectively SOC
sC_max, SOC
sC_min, gross power of handling up needed for mixed energy storage system is P
eS, the maximum charge-discharge electric power of storage battery is
the logic of charge and discharge control strategy, as shown in Figure 2, wherein solid line represents energy storage, releasing can the conversion successively of state, and represented by dotted arrows energy storage, releasing can the selectivity redirect of state, makes a concrete analysis of as follows,
(1) distributed power source power output and system load demand watt level is judged;
(2) if distributed power source power output is greater than system load demand power in (1), SOC is judged
sCvalue;
(3) if (2) middle SOC
sC< SOC
sC_min, control system excision storage battery, reduces the charging response times of storage battery, power-type energy storage super capacitor is charged in invariable power mode;
(4) if (2) middle SOC
sC_min≤ SOC
sC≤ SOC
sC_max, control system controls ultracapacitor absorbed power, and controls storage battery with invariable power
charge, for avoiding super multiplying power to charge, ultracapacitor absorbed power is
(5) if (2) middle SOC
sC> SOC
sC_max, control system excision ultracapacitor, control storage battery with
invariable power charges, and distributed power source power output causes
now, charge in batteries power
constant, ultracapacitor charge power is
due to
thus P
sC≈ P
eS, protection storage battery, consumes the difference that distributed power source power output is greater than system load demand power, and unnecessary electricity is incorporated to micro-capacitance sensor;
(6) if distributed power source power output is less than system load demand power in (1), SOC is judged
sCvalue;
(7) if (6) middle SOC
sC< SOC
sC_min, control system excision super capacitor, ensures that storage battery carrying capacity discharges when 50%;
(8) if (6) middle SOC
sC> SOC
sC_min, control system controls super capacitor preferential discharge, and detects SOC
sCvalue until minimum, then control storage battery and externally discharges, and now, distributed power source power output and system load demand power also exist difference, by micro-capacitance sensor polishing.
Energy storage state is as follows:
Energy storage state 1:SOC
sC< SOC
sC_min, excision storage battery, reduces the charging response times of storage battery, ultracapacitor is charged in invariable power mode;
Energy storage state 2:SOC
sC_min≤ SOC
sC≤ SOC
sC_max, ultracapacitor absorbed power; Storage battery is with invariable power
charging, for avoiding super multiplying power to charge, ultracapacitor charge power is
Energy storage state 3:SOC
sC> SOC
sC_max, excision ultracapacitor, storage battery with
invariable power charges;
Energy storage state 4: distributed power source power output causes
energy storage state 4 is directly proceeded to by current energy storage state (1 or 2).Now, charge in batteries power
constant, ultracapacitor charge power is
due to
thus P
sC≈ P
eS, protection storage battery.After energy storage state 4 terminates, according to SOC
sCreal-time status selectivity proceed to energy storage state 1 or 2 or 3.
In sum, energy type of the present invention and power-type hybrid energy-storing control method for coordinating, when meeting micro-capacitance sensor builder main purpose as far as possible, not only have adjusted the short-term fluctuation that vibration frequency is high, fluctuating range is large, have adjusted again the fluctuation of the long period that period of waves is long, pondage is large, ensure that the useful life of mixed energy storage system, make full use of distribution type renewable energy, the waste of wind, light regenerative resource electric energy is avoided while ensureing power supply reliability, improve the utilance of regenerative resource, have a good application prospect.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (1)
1. energy type and a power-type hybrid energy-storing control method for coordinating, is characterized in that: mixed energy storage system, and comprise power-type energy storage device and energy type energy storage device, concrete control method, comprises the following steps,
Step (1), judges the size of distributed power source power output and system load demand power in micro-capacitance sensor, if when distributed power source power output is greater than system load demand power, performs step (2); If when distributed power source power output is less than system load demand power, perform step (6);
Step (2), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (3); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (4); If during the maximum of power-type energy storage carrying capacity state-of-charge SOC1 higher than its state-of-charge, perform step (5);
Step (3), control system excision energy type energy storage device, and in invariable power mode, power-type energy storage device is charged, consume the difference that distributed power source power output is greater than system load demand power, until when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (4);
Step (4), control system is charged to energy type energy storage device, and charge according to the maximum charge power of energy type energy storage device, consume the difference that distributed power source power output is greater than system load demand power, until during the maximum of power-type energy storage carrying capacity state-of-charge SOC1 higher than its state-of-charge, perform step (5);
Step (5), control system excision power-type energy storage device, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, if during the maximum of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, energy type energy storage continues charging; If during the maximum of energy type energy storage carrying capacity SOC2 higher than its state-of-charge, control system excision energy type energy storage device, consume the difference that distributed power source power output is greater than system load demand power, unnecessary electricity is incorporated to micro-capacitance sensor when running by micro-grid connection, if micro-capacitance sensor is in from network operation, cut-out distributed generation unit;
Step (6), energy management system of micro-grid gathers power-type energy storage carrying capacity SOC1, if during the minimum value of power-type energy storage carrying capacity SOC1 lower than its state-of-charge, perform step (7); If when power-type energy storage carrying capacity SOC1 is between the maximum of its state-of-charge and minimum value, perform step (8); If during minimum value simultaneously lower than its state-of-charge of rate type energy storage carrying capacity SOC1 and energy type energy storage carrying capacity SOC2, the difference of cloth output power of power supply and system load demand power, by micro-capacitance sensor polishing;
Step (7), control system excision power-type energy storage device, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, if during the minimum value of energy type energy storage carrying capacity SOC2 higher than its state-of-charge, control system controls its electric discharge, fills up distributed power source power output and system load demand power difference; If during the minimum value of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, the difference of distributed power source power output and system load demand power, by micro-capacitance sensor polishing;
Step (8), control system controls power-type energy storage device and externally discharges, fill up distributed power source power output and system load demand power difference, if cannot power difference be filled up, energy management system of micro-grid collecting energy type energy storage carrying capacity SOC2, control system controls its electric discharge, fills up distributed power source power output and system load demand power difference; If during the minimum value of energy type energy storage carrying capacity SOC2 lower than its state-of-charge, the difference of distributed power source power output and system load demand power, by micro-capacitance sensor polishing.
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