CN103647296A - Microgrid power balance control method - Google Patents
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Abstract
The invention relates to a microgrid power balance control method. An energy storage device is connected to the microgrid through a bi-directional inverter. When the microgrid is operated in the isolated grid state, the V-f control mode is adopted, the energy storage device is used to provide voltage source support for a micro source in the microgrid, and provide power support according to the output of the micro source and the load change. The specific working mode comprises the following steps: (1) when the micro source output power is equal to the power required by a load, the output of the energy storage device is approximate to zero, and the power required by the loaded is completely supplied by the micro source; (2) when the micro source output power is greater than the power required by the loaded, the energy storage device is controlled so as to be charged to absorb the surplus power of the micro source after the load is satisfied; (3) and when the micro source output power is less than the power required by the loaded, the energy storage device is controlled so as to be discharged to supplement the insufficient portion of the micro source output power. According to the invention, the isolated grid and connected grid smooth switching can be realized, and the power supply interruption problem when the connected grid state is changed into the isolated grid state can be solved, so that a guarantee is provided for the operation of the microgrid in various steady states and transient states.
Description
Technical field
The invention belongs to micro-network stability control technical field, be specifically related to take and regulate the method for controlling power balance that energy storage device is core in a kind of micro-electrical network.
Background technology
Micro-electrical network can stable operation be micro-power grid security, reliability service the prerequisite of bringing into play benefit.Micro-electrical network will accomplish grid-connected and must go up, steady must the living of lonely net, and enough soon, seamless switching, really realizes the plug and play of micro-electrical network, just can give full play to its benefit in isolation.Because micro-electrical network distributed power generation power supply ubiquity overload capacity is low, inertia is little or mertialess feature, and there is the problems such as sudden change in micro-electrical network internal burden, easily causes micro-grid system vibration even to collapse, and seriously restricting development and the application of micro-electrical network.In order to improve this situation, in current micro-electric network composition, conventionally with energy storage device, maintain the stable of system transient modelling, for micro-electrical network provides voltage and frequency, support where necessary, but also only not take at present that energy storage device is control object, can meet the ripe control method that the stable operation under various operational modes of micro-electrical network requires.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the object of the present invention is to provide a kind of micro-grid power balance control method, the method be take energy storage device as control object, can meet the lonely net of micro-electrical network, grid-connected stable operation, and lonely net turns the grid-connected and grid-connected requirement that takes over seamlessly that turns lonely net.
Technical scheme of the present invention is:
A kind of micro-grid power balance control method, energy storage device accesses micro-electrical network by two-way inverter, when the lonely network operation of micro-electrical network, adopt V-f control mode, the micro-power supply of described energy storage device in micro-electrical network of take provides voltage source support, and exert oneself and provide power support with load variations according to micro-power supply, specific works mode is: (1) is when described micro-output power of power supply equals load power demand, the output of described energy storage device is approximately zero, and load power demand is supplied with by described micro-power supply completely; (2) when described micro-output power of power supply is greater than load power demand, control described energy storage device charging, absorb described micro-power supply and meet the surplus power after load; (3) when the power output of described micro-power supply is less than load power demand, control described energy storage device electric discharge, supplement the insufficient section of described micro-output power of power supply.
Under working method (1), the modulation ratio ma of described two-way inverter remains unchanged; Under working method (2), the modulation ratio ma of described two-way inverter is along with lasting charging process direct voltage raises and reduces; Under working method (3), described two-way inverter modulation ratio ma is along with continuous discharge direct voltage declines and increases.
Described micro-power supply is exported as a reference with voltage and the frequency of described two-way inverter.
Preferably power frequency sine wave is carried out to discretization, obtain the sinusoidal wave data of some discrete time points in a power frequency period, the sine table array sin[n that formation is comprised of these some sinusoidal wave datas], according to described sine table array, form corresponding square pulse and replace V-f to control required power frequency sine wave as modulating wave, the relation by switching frequency and work frequency obtains a switch corresponding to the power frequency period sine table n that counts
f, with sine table array element sum n and n
fmultiple be that the step-length of sine table pointer movement while realizing power frequency sine wave is chosen the rectangular pulse for modulating.
When micro-electrical network is incorporated into the power networks, preferably adopt PQ decoupling zero control mode, follow the tracks of rapidly power and change, control separately the variation of active power or reactive power simultaneously.
Can be specifically: first by reactive power set to zero, control separately again active power, stabilize micro-power fluctuation, make micro-electrical network and common electrical exchange between grids power controlled, specific works mode is: (1) is when the difference forward of micro-output power of power supply and load consumption power fluctuates, control described energy storage device charging, absorb unnecessary power; (2) when the difference negative sense of micro-output power of power supply and load consumption power fluctuates, control described energy storage device electric discharge, meet bearing power vacancy.
Preferably power frequency sine wave is carried out to discretization, obtain the sinusoidal wave data of some discrete time points in a power frequency period, the sine table array sin[m that formation is comprised of these some sinusoidal wave datas], according to this sine table array form corresponding square pulse replace PQ decoupling zero control in the required power frequency sine wave of electric voltage feed forward part as modulating wave, the relation by switching frequency and work frequency obtains a switch corresponding to the power frequency period sine table m that counts
f, with sine table array element sum m and m
fmultiple be that the step-length of sine table pointer movement while realizing power frequency sine wave is chosen the rectangular pulse for modulating.
Carry out lonely net/grid connected dual mode while mutually switching, first under present mode of operation, one or more in the voltage of another kind of operational mode, frequency, phase place, power are being followed the tracks of to rectification, be switched to again another kind of operational mode after reaching requirement.
Lonely net/grid connected dual mode switches specifically can adopt following steps: when micro-electrical network is switched to grid-connected pattern by lonely net pattern, during lonely net, adopt V-f control mode to follow the tracks of the voltage under grid-connected pattern, phase place, after grid-connected, transfer control mode to PQ decoupling zero control mode;
When micro-electrical network is switched to lonely net pattern by grid-connected pattern, be divided into two kinds of planned and unplanned property: (1) is planned grid-connected: before grid-connected by switching load or limit micro-power supply and exert oneself, the exchange power of micro-electrical network and public electric wire net is adjusted into zero, after grid-connected, forward control mode to V-f control mode; (2) unplanned property is grid-connected: control mode directly transfers V-f control mode to, if described exchange power is in the capacity allowed band of energy storage device in handoff procedure, control described energy storage device output or absorbed power, if described exchange power exceeds the capacity allowed band of energy storage device, excise fast load or limit micro-power supply and exert oneself.
For aforementioned arbitrary control method, if the SOC of described energy storage device does not reach the minimum threshold value requirement of setting, first adopt constant large electric current to described energy storage device forced charge, after SOC reaches setting threshold, then use the little electric current of constant voltage instead described energy storage device is charged.
Beneficial effect of the present invention is: under lonely net and the pattern that is incorporated into the power networks, carry out in pulse-width modulation process, adopt sine table array to adjust ripple as reference, for lonely net, grid-connected mutual switching have been set up switching tie, when energy storage device is moved under any one pattern, the correlatives such as the voltage of another kind of operational mode and frequency being followed the tracks of to correct becomes possibility, is the seamless condition created that takes over seamlessly.
Owing to having found the tie switching between grid-connected and lonely net, also solved well micro-electrical network from and the power supply discontinuous problem that brings while converting lonely net state to of net state, make the user can be for load provides seamless, stable power supply other power failures of micro-electrical network (containing grid power blackout) in the situation that.
Accompanying drawing explanation
Fig. 1 is energy storage device charging working state schematic representation of the present invention;
Fig. 2 is energy storage device electric discharge working state schematic representation of the present invention;
Fig. 3 is V-f control principle block diagram under lonely net pattern of the present invention;
Fig. 4 is the PQ decoupling zero control principle block diagram based on sine table reference under grid-connected pattern of the present invention;
Fig. 5 is control flow block diagram of the present invention.
Embodiment
The invention provides a kind of micro-grid power balance control method, can be used under the lonely net of micro-electrical network, the pattern that is incorporated into the power networks and lonely net turns grid-connected, the grid-connected control that turns the energy storage device in lonely network process.Energy storage device accesses micro-electrical network by two-way inverter, and micro-electrical network is connected by the points of common connection between the micro-electrical network of PCC(and public electric wire net with public electric wire net) switch realization.Be below the particular content of this control method, the flow chart of this control method can be referring to Fig. 5.
1, the V-f under lonely net pattern controls:
In electric network fault situation or do not possess under grid-connected condition, by regulating two-way inverter to make energy storage device provide voltage source to support for micro-power supplys such as photo-voltaic power supplies in micro-electrical network, according to micro-power supply, exert oneself and load variations provides power support simultaneously.
Under lonely network operation pattern, have three kinds of working conditions: 1), when photo-voltaic power supply is exerted oneself and loading demand power equates, bearing power is supplied with by photo-voltaic power supply completely, the power output of described energy storage device is approximately zero (equal zero or approach very much zero); 2) when photo-voltaic power supply is exerted oneself while being greater than loading demand power, photo-voltaic power supply is exerted oneself after meeting load, surplus power is offered to described energy storage device, and now two-way inverter is operated in rectification state, and described energy storage device is operated in charged state (as shown in Figure 1); 3) when photo-voltaic power supply is exerted oneself while being less than loading demand power, now two-way inverter is operated in inverter mode, described energy storage device is operated in discharge condition (as shown in Figure 2) if when electric discharge also meets load request not, by the control of central controller, and breaking part load).Under lonely network operation pattern, the voltage that photo-voltaic power supply will be exported with two-way inverter and frequency as a reference, are normally moved to maintain it.
When if energy storage device charge and discharge can not meet the power requirement of load, by higher controller, coordinate to change exerting oneself or changing the stable operation that load is realized micro-electrical network of micro-power supply in micro-electrical network, this part content is not within the scope of the present invention.
Under the first working condition, inverter modulation ratio m
aremain unchanged, under the second working condition, inverter modulation ratio m
aalong with lasting charging process direct voltage raises and reduces, under the third working condition, inverter modulation ratio m
aalong with continuous discharge direct voltage declines and increases.
Under lonely network operation pattern, V-f controls need to have power frequency sine wave as modulating wave, in the present invention, the formation method of this modulating wave is: power frequency sine wave (preferably adopting amplitude is 1 power frequency sine wave) is carried out to discretization, obtain the sinusoidal wave data of some in a power frequency period (n) discrete time point, the sine table array sin[n that formation is comprised of these some sinusoidal wave datas], as a reference, the square pulse corresponding to the lower power frequency sine wave data of this discrete time point forming under each discrete time point according to described sine table array replaces V-f to control required power frequency sine wave as modulating wave, relation by switching frequency and work frequency obtains a switch corresponding to the power frequency period sine table n that counts
f(the switching frequency numerical value that the power frequency period of take is unit), with sine table array element sum n and n
fmultiple be that the step-length of sine table pointer movement while realizing power frequency sine wave is chosen the rectangular pulse for modulating, from above-mentioned matrix pulse train, chosen thus the some matrix pulses corresponding with switching signal time point (matrix pulse subsequence), usingd that this makes it meet power frequency sine wave shape (comprising that position is mutually identical) as modulating wave and switching signal comparison and modulation output.
The A of take is example analysis mutually, and the triangular carrier cycle corresponds to cycle count value Coun
pr, A burst length that is conducted corresponds to step-by-step counting Coun
cmpA, A is corresponding counting as n in sine table array
a, have Coun
cmpA=0.5 * Coun
pr(1+m
asin[n
a]), B phase and C phase modulating wave also can move accordingly point operation and obtain from sine table array.V-f control principle block diagram as shown in Figure 3.
When the lonely network operation of micro-electrical network, two-way inversion electric operation is in V-f control mode, and the current array pointer sin_pointer in sine table array, according to certain step change, realizes power frequency modulating wave, by angle corresponding to sin_pointer, goes to upgrade phase-locked angle
.
2, the PQ decoupling zero under grid-connected pattern is controlled:
Control method while being incorporated into the power networks is mainly to stabilize the grid power causing due to the access electrical networks such as photo-voltaic power supply that are subject to inside even from weather to have stochastic volatility to fluctuate, finally realize the controlled and stable of micro-electrical network and common electrical exchange between grids power, realize in other words the power following of micro-electrical network.
What send due to photo-voltaic power supply is mainly active power, so the exchange power fluctuation causing when being incorporated into the power networks be take active power as main.When the fluctuation of compensation active power, may need reactive power to be adjusted into zero, so when micro-electrical network is incorporated into the power networks, adopt meritorious idle decoupling control policy, follow the tracks of rapidly power and change, can control separately two-way inverter output simultaneously and gain merit or idle variation.
PQ decoupling zero is controlled and need to be become take the variable under the synchronous rotating frame that electrical network fundamental voltage is benchmark (by park, to convert the change of variable under three-phase symmetrical rest frame by coordinate transform, transform under d-q coordinate), after conversion, the quantitative change of first-harmonic AC sine is the DC Variable under synchronous rotating frame.Wherein q shaft current is relevant to reactive power, and d shaft current is relevant to real component, and this conversion has realized the decoupling zero of active power and reactive power.
Concrete control mode is: when the difference forward of micro-output power of power supply and load consumption power fluctuates (the direction fluctuation that is greater than zero towards described difference), control described energy storage device charging, absorb unnecessary power; (1) when the difference negative sense when micro-output power of power supply and load consumption power fluctuates (towards the minus direction fluctuation of described difference), control described energy storage device electric discharge, meet bearing power vacancy.By this control mode, can keep the stable, controlled of micro-electrical network and common electrical exchange between grids power.
With lonely net Pattern Class seemingly, under grid-connected pattern, in PQ decoupling zero control, electric voltage feed forward part also needs power frequency sine wave as modulating wave, in the present invention, the formation method of this modulating wave is identical with the formation method of modulating wave in V-f control, for: to power frequency sine wave (for ease of computing, be preferably set to amplitude and be 1 power frequency sine wave) carry out discretization, obtain the sinusoidal wave data of some discrete time points in a power frequency period, the sine table array sin[m that formation is comprised of this some (m) sinusoidal wave data], according to this sine table array form corresponding square pulse replace PQ decoupling zero control in the required power frequency sine wave of electric voltage feed forward part as modulating wave, relation by switching frequency and work frequency obtains a switch corresponding to the power frequency period sine table m that counts
f, with sine table array element sum m and m
fthe step-length of the multiple of (the switching frequency numerical value that the power frequency period of take is unit) sine table pointer movement when realizing power frequency sine wave is chosen the rectangular pulse for modulating.M and n are the integer that is greater than 1, and the two can be the same or different.PQ decoupling zero control principle block diagram as shown in Figure 4, P wherein
reffor given active power, Q
reffor given reactive power, i
idreffor active current, i
iqreffor reactive current, e
a, e
b, e
cfor line voltage, i
ia, i
ib, i
icfor inverter output current, u
dcfor DC side voltage of converter, u
dcreffor inverter direct-current voltage reference, the no-load voltage ratio that k is transformer, w
0for synchronous rotary angular frequency, m
afor modulation ratio, u
ma, u
mb, u
mcthe modulating wave that PQ decoupling zero is controlled, u
iabcfor the three-phase voltage of the filter capacitor of two-way inverter, u
iabcreffilter capacitor three-phase voltage reference for two-way inverter.
When two-way inverter works in grid-connected pattern, phase-locked angle
along with electric network voltage phase changes, by phase-locked angle corresponding to the pointer sin_pointer in sine table array
pQcurrent array pointer sin_pointer and corresponding angle, realization is with reference to modulating wave, the modulating wave that PQ decoupling current ring is obtained is added on the reference modulating wave that sine table generates, and can obtain the output modulating wave that PQ decoupling zero is controlled, and realizes the power tracking of grid-connected pattern.
Under above-mentioned two kinds of patterns, by the sine table array generating as with reference to modulating wave, when being moved under any one pattern, energy-storage system can follow the tracks of rectification to correlatives such as the voltage of another kind of operational mode, frequency, phase place, power, sine table array has been served as the tie that pattern is switched, for realize between two-mode seamless, take over seamlessly the condition created, solved and under conventional method, carried out the problem that is difficult to the references such as given voltage and frequency when pattern is switched.
3, lonely net turns grid-connected control method:
First adopting V-f control mode is voltage source by two-way inverter control, and the voltage under grid-connected pattern, phase place are followed the tracks of, grid-connected after, transfer control mode to PQ decoupling zero control mode.
4, grid-connectedly turn lonely network control method:
(1) the planned grid-connected lonely net that turns:
Need to send instructions under central primary control system, by switchable load or restriction photovoltaic source, exerted oneself and waited measure, adjusting PCC point exchange power is zero, control PCC point high-speed switch disconnection (this process is by central controller controls), control strategy transfers V-f control mode to, switches to lonely network operation.
(2) unplanned property is grid-connected turns lonely net:
Unplanned property is grid-connected, be that the reasons such as the unexpected power down of PCC point or electric network fault cause PCC point to lose electric network source, now control strategy directly transfers V-f control mode to, PCC point exchange power in handoff procedure is in energy storage device capacity allowed band, by energy storage device, supply with or absorb, if exceed its range of capacity, must take fast the measure such as exert oneself of cutting load or restriction photo-voltaic power supply, make two-way inverter stable operation.
In order to represent more intuitively above-mentioned control method, from sine table array aspect, lonely net, grid-connected, lonely net are turned to grid-connected, grid-connected control procedure while turning lonely net below and describe:
When the lonely network operation of micro-electrical network, two-way invertor operation is in V-f control mode, and the current array pointer sin_pointer in sine table array, according to certain step change, realizes power frequency modulating wave, by angle corresponding to sin_pointer, goes to upgrade phase-locked angle
;
When micro-electrical network is incorporated into the power networks, two-way invertor operation is in PQ decoupling zero control mode, phase-locked angle
along with electric network voltage phase changes, by phase-locked angle corresponding to the pointer sin_pointer in sine table array
pQcurrent array pointer sin_pointer and corresponding angle, realization is with reference to modulating wave, the modulating wave that PQ decoupling current ring is obtained is added on the reference modulating wave that sine table generates, and can obtain the output modulating wave that PQ decoupling zero is controlled, and realizes the power tracking of grid-connected pattern;
When the lonely net of needs is switched to when grid-connected, phase-locked angle
along with electric network voltage phase changes, calculate
pointer sin_pointer corresponding to sine table array
pQ, with current array pointer sin_pointer, follow the trail of sin_pointer
pQ, in process, two-way inverter moves in V-f voltage source mode, and modulating wave generates the variation that depends on sin_pointer, when two pointers equate, controls PCC point high-speed switch closed, switches to the pattern of being incorporated into the power networks, and with reference to modulating wave, depends on sin_pointer
pQ(sin_pointer and sin_pointer
pQkeep to equate) variation, after stable operation, modulating wave PQ decoupling current ring being generated according to power instruction is superimposed upon with reference on modulating wave, realizes power tracking and controls;
When needs are by grid-connected while being switched to lonely network operation, phase-locked angle
the sin_pointer(of corresponding switching instant is sin_pointer and sin_pointer now
pQstill equate) keep a switch periods, sin_pointer no longer follows the trail of sin_pointer
pQ, with reference to modulating wave, do not rely on sin_pointer
pQvariation, now can control PCC point high-speed switch and disconnect, micro-electrical network is in lonely net state.Sin_pointer, according to the pointer value of switching instant, according to certain step change, realizes new reference modulating wave, becomes the lonely network operation pattern that V-f controls.
In lonely net, grid-connected or lonely net and grid-connected 's handoff procedure, all may relate to the adjusting that discharges and recharges to energy storage device; for the protection to energy storage device; all need the residual capacity (SOC) to energy storage device to judge; if the SOC of described energy storage device does not reach the minimum threshold value requirement of setting; first adopt constant large electric current to described energy storage device forced charge; after SOC reaches setting threshold, then use the little electric current of constant voltage instead described energy storage device is charged.
It should be noted that, the present invention has not only comprised A and has equated in mathematical meaning with B alleged " A equals B ", " A and B equate ", has also comprised A and has fallen into an interval situation that has comprised B and had bound.
Claims (10)
1. a micro-grid power balance control method, energy storage device accesses micro-electrical network by two-way inverter, it is characterized in that when the lonely network operation of micro-electrical network, adopt V-f control mode, the micro-power supply of described energy storage device in micro-electrical network of take provides voltage source support, and exert oneself and provide power support with load variations according to micro-power supply, specific works mode is: (1) is when described micro-output power of power supply equals load power demand, the output of described energy storage device is approximately zero, and load power demand is supplied with by described micro-power supply completely; (2) when described micro-output power of power supply is greater than load power demand, control described energy storage device charging, absorb described micro-power supply and meet the surplus power after load; (3) when the power output of described micro-power supply is less than load power demand, control described energy storage device electric discharge, supplement the insufficient section of described micro-output power of power supply.
2. micro-grid power balance control method as claimed in claim 1, is characterized in that under working method (1) the modulation ratio m of described two-way inverter
aremain unchanged; Under working method (2), the modulation ratio m of described two-way inverter
aalong with lasting charging process direct voltage raises and reduces; Under working method (3), described two-way inverter modulation ratio m
aalong with continuous discharge direct voltage declines and increases.
3. micro-grid power balance control method as claimed in claim 2, is characterized in that described micro-power supply with the voltage of described two-way inverter and frequency output as a reference.
4. micro-grid power balance control method as claimed in claim 3, it is characterized in that power frequency sine wave to carry out discretization, obtain the sinusoidal wave data of some discrete time points in a power frequency period, the sine table array sin[n that formation is comprised of these some sinusoidal wave datas], according to described sine table array, form corresponding square pulse and replace V-f to control required power frequency sine wave as modulating wave, the relation by switching frequency and work frequency obtains a switch corresponding to the power frequency period sine table n that counts
f, with sine table array element sum n and n
fmultiple be that the step-length of sine table pointer movement while realizing power frequency sine wave is chosen the rectangular pulse for modulating.
5. the micro-grid power balance control method as described in claim 1,2,3 or 4, is characterized in that when micro-electrical network is incorporated into the power networks, and adopts PQ decoupling zero control mode, follows the tracks of rapidly power and changes, and controls separately the variation of active power or reactive power simultaneously.
6. micro-grid power balance control method as claimed in claim 5, it is characterized in that first by reactive power set to zero, control separately again active power, stabilize micro-power fluctuation, make micro-electrical network and common electrical exchange between grids power controlled, specific works mode is: (1), when the difference forward of micro-output power of power supply and load consumption power fluctuates, controls described energy storage device charging, absorbs unnecessary power; (2) when the difference negative sense of micro-output power of power supply and load consumption power fluctuates, control described energy storage device electric discharge, meet bearing power vacancy.
7. micro-grid power balance control method as claimed in claim 6, it is characterized in that power frequency sine wave to carry out discretization, obtain the sinusoidal wave data of some discrete time points in a power frequency period, the sine table array sin[m that formation is comprised of these some sinusoidal wave datas], according to this sine table array form corresponding square pulse replace PQ decoupling zero control in the required power frequency sine wave of electric voltage feed forward part as modulating wave, the relation by switching frequency and work frequency obtains a switch corresponding to the power frequency period sine table m that counts
f, with sine table array element sum m and m
fmultiple be that the step-length of sine table pointer movement while realizing power frequency sine wave is chosen the rectangular pulse for modulating.
8. the micro-grid power balance control method as described in claim 1,2,3,4,5,6 or 7, it is characterized in that carrying out lonely net/grid connected dual mode while mutually switching, first under present mode of operation, one or more in the voltage of another kind of operational mode, frequency, phase place, power are followed the tracks of to rectification, be switched to again another kind of operational mode after reaching requirement.
9. micro-grid power balance control method as claimed in claim 8, it is characterized in that when micro-electrical network is switched to grid-connected pattern by lonely net pattern, during lonely net, adopt V-f control mode to follow the tracks of the voltage under grid-connected pattern, phase place, grid-connected after, transfer control mode to PQ decoupling zero control mode;
When micro-electrical network is switched to lonely net pattern by grid-connected pattern, be divided into two kinds of planned and unplanned property: (1) is planned grid-connected: before grid-connected by switching load or limit micro-power supply and exert oneself, the exchange power of micro-electrical network and public electric wire net is adjusted into zero, after grid-connected, forward control mode to V-f control mode; (2) unplanned property is grid-connected: control mode directly transfers V-f control mode to, if described exchange power is in the capacity allowed band of energy storage device in handoff procedure, control described energy storage device output or absorbed power, if described exchange power exceeds the capacity allowed band of energy storage device, excise fast load or limit micro-power supply and exert oneself.
10. the micro-grid power balance control method as described in claim 1,2,3,4,5,6,7,8 or 9, if it is characterized in that, the SOC of described energy storage device does not reach the minimum threshold value requirement of setting, first adopt constant large electric current to described energy storage device forced charge, after SOC reaches setting threshold, then use the little electric current of constant voltage instead described energy storage device is charged.
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| CN104821600A (en) * | 2015-05-14 | 2015-08-05 | 南通大学 | Flexible grid-connected scheduling algorithm for distributed wind and photovoltaic hybrid power generation system |
| CN103647296B (en) * | 2013-09-26 | 2015-11-25 | 北京北变微电网技术有限公司 | microgrid power balance control method |
| WO2021238889A1 (en) * | 2020-05-27 | 2021-12-02 | 华为技术有限公司 | Electric energy control method and related device |
| CN113935671A (en) * | 2020-07-13 | 2022-01-14 | 中国石油化工股份有限公司 | Storage, material conveying control method, device and equipment for refining and chemical enterprises |
| CN114123351A (en) * | 2021-11-26 | 2022-03-01 | 锦浪科技股份有限公司 | Off-grid and grid-connected control method for off-grid and grid-connected energy storage inverter key load capable of being connected in parallel |
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| CN103647296B (en) * | 2013-09-26 | 2015-11-25 | 北京北变微电网技术有限公司 | microgrid power balance control method |
| CN104201718A (en) * | 2014-09-05 | 2014-12-10 | 广东电网公司佛山供电局 | Droop-inverted droop type micro-grid inverter power supply with hysteresis characteristic |
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| WO2021238889A1 (en) * | 2020-05-27 | 2021-12-02 | 华为技术有限公司 | Electric energy control method and related device |
| CN113747548A (en) * | 2020-05-27 | 2021-12-03 | 上海华为技术有限公司 | Electric energy control method and related equipment |
| CN113747548B (en) * | 2020-05-27 | 2023-11-10 | 上海华为技术有限公司 | Electric energy control method and related equipment |
| CN113935671A (en) * | 2020-07-13 | 2022-01-14 | 中国石油化工股份有限公司 | Storage, material conveying control method, device and equipment for refining and chemical enterprises |
| CN114123351A (en) * | 2021-11-26 | 2022-03-01 | 锦浪科技股份有限公司 | Off-grid and grid-connected control method for off-grid and grid-connected energy storage inverter key load capable of being connected in parallel |
| CN114977230A (en) * | 2022-06-08 | 2022-08-30 | 广东顺德盛善能源科技有限公司 | Electric energy output method and device, power supply equipment and storage medium |
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