CN103647296B - microgrid power balance control method - Google Patents

microgrid power balance control method Download PDF

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CN103647296B
CN103647296B CN201310443856.1A CN201310443856A CN103647296B CN 103647296 B CN103647296 B CN 103647296B CN 201310443856 A CN201310443856 A CN 201310443856A CN 103647296 B CN103647296 B CN 103647296B
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energy storage
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control
grid
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CN103647296A (en
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孔启翔
赵庆苓
刘贵程
袁增贵
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Bbht-Beijing Baidian Micro Grind Technology Co Ltd
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Bbht-Beijing Baidian Micro Grind Technology Co Ltd
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Abstract

The present invention relates to a kind of microgrid power balance control method, energy storage device is by two-way inverter access micro-capacitance sensor, during micro-capacitance sensor isolated power grid, adopt V-f control mode, be that micro battery in micro-capacitance sensor provides voltage source support with energy storage device, and exert oneself according to micro battery and load variations provides power support, specific works mode is: (1) is when micro battery power output equals load power demand, the output of energy storage device is approximately zero, and load power demand is supplied by micro battery completely; (2) when micro battery power output is greater than load power demand, control energy storage device charging, absorption micro battery meets the surplus power after load; (3) when the power output of micro battery is less than load power demand, control energy storage device electric discharge, supplement the insufficient section of micro battery power output.The present invention can realize lonely net, grid-connected take over seamlessly, solve and net state turns lonely net time power supply discontinuous problem, give security for micro-capacitance sensor runs at various Steady state and transient state.

Description

Microgrid power balance control method
Technical field
The invention belongs to micro-capacitance sensor stability control techniques field, be specifically related in a kind of micro-capacitance sensor with the method for controlling power balance regulating energy storage device to be core.
Background technology
Micro-capacitance sensor can stable operation be micro-capacitance sensor safety, reliability service play the prerequisite of benefit.Micro-capacitance sensor will be accomplished grid-connected and must go up, and lonely net is steady must live, and isolation is enough fast, and seamless switching, really realizes the plug and play of micro-capacitance sensor, just can give full play to its benefit.Because micro-capacitance sensor 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-capacitance sensor internal burden, easily causes micro-grid system to vibrate and even collapse, seriously govern development and the application of micro-capacitance sensor.In order to improve this situation, in current micro-capacitance sensor structure, usual energy storage device maintains the stable of system transient modelling, where necessary for micro-capacitance sensor provides voltage and frequency to support, but with energy storage device be not only also at present control object, the ripe control method that micro-capacitance sensor stable operation under various operational mode requires can be met.
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 microgrid power balance control method, the method take energy storage device as control object, can meet the lonely net of micro-capacitance sensor, stability of grid connection runs, and what lonely net turned grid-connected and grid-connected turn of lonely net takes over seamlessly requirement.
Technical scheme of the present invention is:
A kind of microgrid power balance control method, energy storage device is by two-way inverter access micro-capacitance sensor, when micro-capacitance sensor isolated power grid, adopt V-f control mode, with described energy storage device for the micro battery in micro-capacitance sensor provides voltage source support, and according to micro battery exert oneself and load variations power support is provided, specific works mode is: (1) is when described micro battery power output equals load power demand, the output of described energy storage device is approximately zero, and load power demand is supplied by described micro battery completely; (2) when described micro battery power output is greater than load power demand, control described energy storage device charging, absorb described micro battery meet load after surplus power; (3) when the power output of described micro battery is less than load power demand, control the electric discharge of described energy storage device, supplement the insufficient section of described micro battery power output.
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 raises along with lasting charging process direct voltage and reduces; Under working method (3), described two-way inverter modulation ratio ma declines along with continuous discharge direct voltage and increases.
Described micro battery with the voltage of described two-way inverter and rate-adaptive pacemaker as a reference.
Preferably discretization is carried out to power frequency sine wave, obtain the sinusoidal wave data of some discrete time points in a power frequency period, form the sine table array sin [n] be made up of this some sinusoidal wave data, forming corresponding square pulse according to described sine table array replaces V-f to control required power frequency sine wave as modulating wave, obtains switch corresponding to power frequency period sine table to count n by the relation of switching frequency and work frequency f, with sine table array element sum n and n fmultiple be the rectangular pulse that the step-length of sine table pointer movement when realizing power frequency sine wave chooses for modulating.
When micro-grid connection is run, preferably adopt PQ uneoupled control mode, follow the tracks of changed power rapidly, control separately the change of active power or reactive power simultaneously.
Can be specifically: first by reactive power set to zero, control active power separately again, stabilize micro battery power fluctuation, make micro-capacitance sensor and common electrical exchange between grids power controlled, specific works mode is: (1) is when the difference forward of micro battery power output and load consuming power fluctuates, control the charging of described energy storage device, absorb unnecessary power; (2) when the difference negative sense of micro battery power output and load consuming power fluctuates, control the electric discharge of described energy storage device, meet bearing power vacancy.
Preferably discretization is carried out to power frequency sine wave, obtain the sinusoidal wave data of some discrete time points in a power frequency period, form the sine table array sin [m] be made up of this some sinusoidal wave data, forming corresponding square pulse according to this sine table array to replace in PQ uneoupled control power frequency sine wave needed for electric voltage feed forward part as modulating wave, obtains switch corresponding to power frequency period sine table to count m by the relation of switching frequency and work frequency f, with sine table array element sum m and m fmultiple be the rectangular pulse that the step-length of sine table pointer movement when realizing power frequency sine wave chooses for modulating.
When carrying out lonely net/grid connected dual mode and mutually switching, first under present mode of operation, tracking is carried out to one or more in the voltage of another kind of operational mode, frequency, phase place, power and correct, after reaching requirement, be switched to another kind of operational mode again.
Lonely net/grid connected dual mode switches specifically can adopt following steps: when micro-capacitance sensor is switched to grid-connect mode by lonely net pattern, V-f control mode is adopted to follow the tracks of the voltage under grid-connect mode, phase place during lonely net, after grid-connected, control mode is transferred to PQ uneoupled control mode;
When micro-capacitance sensor is switched to lonely net pattern by grid-connect mode, be divided into planned and unplanned property two kinds: (1) is planned grid-connected: exerted oneself by switching load or restriction micro battery before grid-connected, the exchange power of micro-capacitance sensor and public electric wire net is adjusted to zero, after grid-connected, control mode is forwarded 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 to export or absorbed power, if described exchange power exceeds the capacity allowed band of energy storage device, excision load or restriction micro battery are exerted oneself fast.
For aforementioned arbitrary control method, if the SOC of described energy storage device does not reach the threshold requirement of minimum setting, first adopt constant big current to described energy storage device forced charge, after SOC reaches setting threshold, then use constant voltage small area analysis instead described energy storage device is charged.
Beneficial effect of the present invention is: carry out in pulse-width modulation process under lonely net and the pattern that is incorporated into the power networks, adopt sine table array as reference adjustment ripple, for lonely net, grid-connected mutual switching establish switching tie, when energy storage device is run under any one pattern, tracking rectification is carried out to correlatives such as the voltage of another kind of operational mode and frequencies and become possibility, take over seamlessly for seamless the condition of creating.
Owing to have found the tie switched between grid-connected and lonely net, also solve micro-capacitance sensor well and become the power supply discontinuous problem brought during lonely net state from grid-connected State Transferring, make user can when other power failures of micro-capacitance sensor (containing grid power blackout) for load provides seamless, stable power supply.
Accompanying drawing explanation
Fig. 1 is energy storage device of the present invention charging working state schematic representation;
Fig. 2 is energy storage device of the present invention electric discharge working state schematic representation;
Fig. 3 is V-f control principle block diagram under lonely net pattern of the present invention;
Fig. 4 is the PQ uneoupled control theory diagram based on sine table reference under grid-connect mode of the present invention;
Fig. 5 is control flow block diagram of the present invention.
Embodiment
The invention provides a kind of microgrid power balance control method, the control of the energy storage device under can be used for the lonely net of micro-capacitance sensor, the pattern that is incorporated into the power networks and in lonely net turn grid-connected, grid-connected turn of lonely network process.Energy storage device is by two-way inverter access micro-capacitance sensor, and the connection of micro-capacitance sensor and public electric wire net is by the points of common connection between PCC(micro-capacitance sensor and public electric wire net) switch realizes.Be below the particular content of this control method, the flow chart of this control method can see Fig. 5.
1, the V-f under lonely net pattern controls:
Under grid fault conditions or under not possessing grid-connected conditions, by regulating two-way inverter to make energy storage device provide voltage source to support for micro battery such as photo-voltaic power supplies in micro-capacitance sensor, to exert oneself according to micro battery and load variations provides power support simultaneously.
Under isolated power grid pattern, have three kinds of working conditions: 1) when photo-voltaic power supply is exerted oneself equal with load demand power, bearing power is supplied by photo-voltaic power supply completely, the power output of described energy storage device is approximately zero (namely equal zero or closely zero); 2) when photo-voltaic power supply exert oneself be greater than load demand power time, photo-voltaic power supply is exerted oneself after meeting load, surplus power is supplied 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 exert oneself be less than load demand power time, 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 isolated power grid pattern, the voltage that photo-voltaic power supply will export with two-way inverter and frequency as a reference, are normally run to maintain it.
If when energy storage device charge and discharge can not meet the power requirement of load, then exerting oneself or changing load to realize the stable operation of micro-capacitance sensor by micro battery in higher controller coordination change micro-capacitance sensor, 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 araise along with lasting charging process direct voltage and reduce, under the third working condition, inverter modulation ratio m adecline along with continuous discharge direct voltage and increase.
Under isolated power grid pattern, V-f controls to need power frequency sine wave as modulating wave, in the present invention, the formation method of this modulating wave is: carry out discretization to power frequency sine wave (preferably adopting amplitude to be the power frequency sine wave of 1), obtain the sinusoidal wave data of some in a power frequency period (n) discrete time point, form the sine table array sin [n] be made up of this some sinusoidal wave data, as a reference, the square pulse corresponding to power frequency sine wave data under this discrete time point formed under each discrete time point according to described sine table array replaces V-f to control required power frequency sine wave as modulating wave, obtain switch corresponding to power frequency period sine table by the relation of switching frequency and work frequency to count n f(the switching frequency numerical value namely in units of a power frequency period), with sine table array element sum n and n fmultiple be the rectangular pulse that the step-length of sine table pointer movement when realizing power frequency sine wave chooses for modulating, from above-mentioned rectangular pulse sequence, have chosen the some rectangular pulse (rectangular pulse subsequence) corresponding with switching signal time point thus, compare in this, as modulating wave and switching signal and modulate output and make it meet power frequency sine wave shape (comprising position mutually identical).
For the analysis of A phase, 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 phase 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 point operation accordingly and obtain from sine table array.V-f control principle block diagram as shown in Figure 3.
When micro-capacitance sensor isolated power grid, 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, goes to upgrade phase-locked angle by the angle that sin_pointer is corresponding .
2, the PQ uneoupled control under grid-connect mode:
The grid power that control method when the being incorporated into the power networks photo-voltaic power supply etc. mainly stabilized owing to having stochastic volatility by inside even from weather accesses electrical network and causes fluctuates, finally realize the controlled and stable of micro-capacitance sensor and common electrical exchange between grids power, the power realizing micro-capacitance sensor is in other words followed.
Due to the mainly active power that photo-voltaic power supply sends, so the exchange power fluctuation caused when being incorporated into the power networks is based on active power.When compensating active power fluctuation, reactive power may be needed to be adjusted to zero, so when micro-grid connection is run, to adopt decoupled active and reactive control strategy, follow the tracks of changed power rapidly, two-way inverter can be controlled separately simultaneously and export meritorious or idle change.
PQ uneoupled control needs the change of variable under three-phase symmetrical rest frame to be become by coordinate transform (namely to be converted by park with the variable under the electrical network fundamental voltage synchronous rotating frame that is benchmark, under transforming to 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 achieves the decoupling zero of active power and reactive power.
Concrete control mode is: when the difference forward of micro battery power output and load consuming power fluctuates (fluctuating in the direction being namely greater than zero towards described difference), control the charging of described energy storage device, absorb unnecessary power; (1) when the difference negative sense of micro battery power output and load consuming power fluctuates (namely fluctuating towards the minus direction of described difference), control the electric discharge of described energy storage device, meet bearing power vacancy.The stable, controlled of micro-capacitance sensor and common electrical exchange between grids power can be kept by this control mode.
With lonely net Pattern Class seemingly, under grid-connect mode, in PQ uneoupled 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 control with V-f in the formation method of modulating wave identical, for: to power frequency sine wave (for ease of computing, be preferably set to the power frequency sine wave that amplitude is 1) carry out discretization, obtain the sinusoidal wave data of some discrete time points in a power frequency period, form the sine table array sin [m] be made up of this some (m) sinusoidal wave data, forming corresponding square pulse according to this sine table array to replace in PQ uneoupled control power frequency sine wave needed for electric voltage feed forward part as modulating wave, obtain switch corresponding to power frequency period sine table by the relation of switching frequency and work frequency to count m f, with sine table array element sum m and m fthe multiple of (the switching frequency numerical value namely in units of a power frequency period) is the rectangular pulse that the step-length of sine table pointer movement when realizing power frequency sine wave chooses for modulating.M and n is the integer being greater than 1, and the two can be the same or different.PQ uneoupled control theory diagram as shown in Figure 4, wherein P 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, k is the no-load voltage ratio of transformer, w 0for synchronous rotary angular frequency, m afor modulation ratio, u ma, u mb, u mcthe modulating wave of PQ uneoupled control, u iabcfor the three-phase voltage of the filter capacitor of two-way inverter, u iabcreffor the filter capacitor three-phase voltage reference of two-way inverter.
When two-way inverter works in grid-connect mode, phase-locked angle along with electric network voltage phase change, correspond to the pointer sin_pointer in sine table array by phase-locked angle pQcurrent array pointer sin_pointer and the angle of correspondence, realize with reference to modulating wave, on the reference modulating wave that the sine table that is added to by the modulating wave that PQ decoupling current ring obtains generates, the output modulating wave of PQ uneoupled control can be obtained, realize the power tracking of grid-connect mode.
Under above-mentioned two kinds of patterns, by the sine table array generated as reference modulating wave, tracking can be carried out to correlatives such as the voltage of another kind of operational mode, frequency, phase place, power when energy-storage system is run under any one pattern to correct, sine table array act as the tie that pattern switches, for realize between two-mode seamless, take over seamlessly the condition of creating, carry out under solving conventional method being difficult to the problem of the references such as given voltage and frequency when pattern switches.
3, lonely net turns grid-connected control method:
First adopt V-f control mode to be voltage source by two-way inverter control, the voltage under grid-connect mode, phase place are followed the tracks of, after grid-connected, control mode is transferred to PQ uneoupled control mode.
4, grid-connected turn of lonely network control method:
(1) planned grid-connected turn of lonely net:
Send instructions under needing central primary control system, to be exerted oneself the measure of grade by switchable load or restriction photovoltaic source, adjustment 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 isolated power grid.
(2) unplanned property grid-connected turn of lonely net:
Unplanned property is grid-connected, namely the reason such as the unexpected power down of PCC point or electric network fault causes PCC point to lose electric network source, now control strategy directly transfers V-f control mode to, PCC point in handoff procedure exchanges power in energy storage device capacity allowed band, supplied by energy storage device or absorb, if exceed its range of capacity, cutting load or restriction photo-voltaic power supply must be taked fast the measure such as to exert oneself, make two-way inverter stable operation.
In order to represent above-mentioned control method more intuitively, from sine table array aspect, the control procedure that lonely net, grid-connected, lonely net turn when grid-connected, grid-connected turn of orphan nets is described below:
When micro-capacitance sensor isolated power grid, 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, goes to upgrade phase-locked angle by the angle that sin_pointer is corresponding ;
When micro-grid connection is run, two-way invertor operation in PQ uneoupled control mode, phase-locked angle along with electric network voltage phase change, correspond to the pointer sin_pointer in sine table array by phase-locked angle pQcurrent array pointer sin_pointer and the angle of correspondence, realize with reference to modulating wave, on the reference modulating wave that the sine table that is added to by the modulating wave that PQ decoupling current ring obtains generates, the output modulating wave of PQ uneoupled control can be obtained, realize the power tracking of grid-connect mode;
When the lonely net of needs is switched to grid-connected, phase-locked angle along with electric network voltage phase change, calculate corresponding to the pointer sin_pointer of sine table array pQ, follow the trail of sin_pointer with current array pointer sin_pointer pQ, in process, two-way inverter runs in V-f voltage source mode, and modulating wave generates the change depending on sin_pointer, and when two pointers are equal, control PCC point high-speed switch closes, and switches to the pattern of being incorporated into the power networks, and depends on sin_pointer with reference to modulating wave pQ(sin_pointer and sin_pointer pQkeep equal) change, after stable operation, the modulating wave that PQ decoupling current ring generates is superimposed upon with reference on modulating wave according to power instruction, realizes power tracking and control;
When needs by grid-connected be switched to isolated power grid time, phase-locked angle sin_pointer(now sin_pointer and sin_pointer of corresponding switching instant pQstill equal) keep a switch periods, sin_pointer no longer follows the trail of sin_pointer pQ, do not rely on sin_pointer with reference to modulating wave pQchange, now can control PCC point high-speed switch disconnect, micro-capacitance sensor 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 isolated power grid pattern that V-f controls.
Lonely net, grid-connected or lonely net and grid-connected between handoff procedure in all may relate to the discharge and recharge of energy storage device is regulated; for the protection to energy storage device; the residual capacity to energy storage device (SOC) is all needed to judge; if the SOC of described energy storage device does not reach the threshold requirement of minimum setting; first adopt constant big current to described energy storage device forced charge; after SOC reaches setting threshold, then use constant voltage small area analysis instead described energy storage device is charged.
It should be noted that, " A equals B " alleged by the present invention, that " A and B is equal " not only contains A and B is equal in mathematical meaning, further comprises A and fall into one and contain B and the situation with the interval of bound.

Claims (9)

1. a microgrid power balance control method, energy storage device is by two-way inverter access micro-capacitance sensor, it is characterized in that when micro-capacitance sensor isolated power grid, adopt V-f control mode, with described energy storage device for the micro battery in micro-capacitance sensor provides voltage source support, and according to micro battery exert oneself and load variations power support is provided, specific works mode is: (1) is when described micro battery power output equals load power demand, the output of described energy storage device is approximately zero, and load power demand is supplied by described micro battery completely; (2) when described micro battery power output is greater than load power demand, control described energy storage device charging, absorb described micro battery meet load after surplus power; (3) when the power output of described micro battery is less than load power demand, control the electric discharge of described energy storage device, supplement the insufficient section of described micro battery power output, 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 araise along with lasting charging process direct voltage and reduce; Under working method (3), described two-way inverter modulation ratio m adecline along with continuous discharge direct voltage and increase, described micro battery with the voltage of described two-way inverter and rate-adaptive pacemaker as a reference, discretization is carried out to power frequency sine wave, obtain the sinusoidal wave data of some discrete time points in a power frequency period, form the sine table array sin [n] be made up of this some sinusoidal wave data, forming corresponding square pulse according to described sine table array replaces V-f to control required power frequency sine wave as modulating wave, obtains switch corresponding to power frequency period sine table to count n by the relation of switching frequency and work frequency f, with sine table array element sum n and n fmultiple be the rectangular pulse that the step-length of sine table pointer movement when realizing power frequency sine wave chooses for modulating.
2. microgrid power balance control method as claimed in claim 1, is characterized in that when micro-grid connection is run, and adopts PQ uneoupled control mode, follows the tracks of changed power rapidly, control separately the change of active power or reactive power simultaneously.
3. microgrid power balance control method as claimed in claim 2, it is characterized in that first by reactive power set to zero, control active power separately again, stabilize micro battery power fluctuation, make micro-capacitance sensor and common electrical exchange between grids power controlled, specific works mode is: (1), when the difference forward of micro battery power output and load consuming power fluctuates, controls the charging of described energy storage device, absorbs unnecessary power; (2) when the difference negative sense of micro battery power output and load consuming power fluctuates, control the electric discharge of described energy storage device, meet bearing power vacancy.
4. microgrid power balance control method as claimed in claim 3, it is characterized in that carrying out discretization to power frequency sine wave, obtain the sinusoidal wave data of some discrete time points in a power frequency period, form the sine table array sin [m] be made up of this some sinusoidal wave data, forming corresponding square pulse according to this sine table array to replace in PQ uneoupled control power frequency sine wave needed for electric voltage feed forward part as modulating wave, obtains switch corresponding to power frequency period sine table to count m by the relation of switching frequency and work frequency f, with sine table array element sum m and m fmultiple be the rectangular pulse that the step-length of sine table pointer movement when realizing power frequency sine wave chooses for modulating.
5. the microgrid power balance control method as described in claim 1,2,3 or 4, it is characterized in that when carrying out lonely net/grid connected dual mode and mutually switching, first under present mode of operation, carry out tracking to one or more in the voltage of another kind of operational mode, frequency, phase place, power to correct, after reaching requirement, be switched to another kind of operational mode again.
6. microgrid power balance control method as claimed in claim 5, it is characterized in that when micro-capacitance sensor is switched to grid-connect mode by lonely net pattern, adopt V-f control mode to follow the tracks of the voltage under grid-connect mode, phase place during lonely net, after grid-connected, control mode is transferred to PQ uneoupled control mode;
When micro-capacitance sensor is switched to lonely net pattern by grid-connect mode, be divided into planned and unplanned property two kinds: (1) is planned grid-connected: exerted oneself by switching load or restriction micro battery before grid-connected, the exchange power of micro-capacitance sensor and public electric wire net is adjusted to zero, after grid-connected, control mode is forwarded 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 to export or absorbed power, if described exchange power exceeds the capacity allowed band of energy storage device, excision load or restriction micro battery are exerted oneself fast.
7. the microgrid power balance control method as described in claim 1,2,3 or 4, if it is characterized in that, the SOC of described energy storage device does not reach the threshold requirement of minimum setting, first adopt constant big current to described energy storage device forced charge, after SOC reaches setting threshold, then use constant voltage small area analysis instead described energy storage device is charged.
8. microgrid power balance control method as claimed in claim 5, if it is characterized in that, the SOC of described energy storage device does not reach the threshold requirement of minimum setting, first adopt constant big current to described energy storage device forced charge, after SOC reaches setting threshold, then use constant voltage small area analysis instead described energy storage device is charged.
9. microgrid power balance control method as claimed in claim 6, if it is characterized in that, the SOC of described energy storage device does not reach the threshold requirement of minimum setting, first adopt constant big current to described energy storage device forced charge, after SOC reaches setting threshold, then use constant voltage small area analysis instead described energy storage device is charged.
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