CN105470997A - Microgrid control system - Google Patents

Abstract

The invention provides a microgrid control system, which comprises an energy management systems, a detection system and a microgrid system, wherein the microgrid system comprising: a photovoltaic power generation unit, a wind power generation unit, an energy storage unit and an important load; and the detection system is used for detecting remaining capacity SOC of the energy storage unit, a photovoltaic grid-connected inverter operation active power P<PV> (t) of the photovoltaic power generation unit, a fan grid-connected inverter operation active power P<WP> (t) of the wind power generation unit and an active power P<l1>(t) of the important load. The microgrid control system further comprises a micro-gas turbine power generation unit, which can be started when the photovoltaic power generation unit and the wind power generation unit output insufficiently during isolated grid operation of the microgrid control system, so as to provide power to the load and reduce the energy storage capacity of storage batteries of the energy storage unit. Therefore, the microgrid control system can reduce environmental pollution, decrease microgrid construction, operation and maintenance cost, and improve reliability of isolated grid operation of the microgrid.

Description

A kind of micro grid control system

Technical field

The present invention relates to micro-capacitance sensor and run control technology field, be specifically related to a kind of micro grid control system.

Background technology

The renewable energy power generation such as photovoltaic generation, wind power generation technology obtains to be paid close attention to widely and applies, have need for electricity on some samll cities and towns, pastoral area, island etc. but be not easy to large scale electric network build area, the application of regenerative resource, for reducining the construction costs, realizes energy-saving and emission-reduction significant.In order to make full use of regenerative resource, adopting micro-capacitance sensor technology distributed energy and load to be linked up, both having achieved the local use of regenerative resource, reduced the wastage, achieved again the rational management of electric energy in region, improve electricity consumption reliability.Micro-capacitance sensor also claims microgrid; it is the system that a distribution type power supply, load, energy-storage system and control device are formed; micro-capacitance sensor be one can teaching display stand control, the autonomous system of protect and manage, both can be incorporated into the power networks with external electrical network, also can isolated operation.

During micro-capacitance sensor isolated power grid, owing to lacking the capacity support that bulk power grid provides, therefore top priority is exactly set up reliable and stable voltage and frequency reference.Because in micro-capacitance sensor, the regenerative resource such as photovoltaic and wind energy and load all have fluctuation and uncertainty, therefore, need to balance energy hunting.At present, usually use jumbo energy-storage units to realize this function, when renewable energy power generation amount is greater than the demand of load, electrical power storage is got up; When renewable source of energy generation amount is less than the demand of load, energy-storage units discharges to micro-capacitance sensor, with the electricity needed for supplementary load.

At present, conventional energy-storage units adopts the energy-storage battery (i.e. storage battery) of chemistry to realize usually, such as, lead-acid battery, lithium ion battery, iron cell etc., but these chemical energy storage methods exist that environmental pollution is large, useful life is short, O&M cost is high and the problem such as poor stability.At present, when micro-capacitance sensor isolated power grid, for the impact to electrical network when reduction regenerative resource and sudden load change, ensure supply of electric power when renewable energy power generation is not enough, often need the stored energy capacitance increasing storage battery, this makes micro-capacitance sensor construction and O&M cost increase, and accordingly, the impact that the storage battery that stored energy capacitance is larger also causes biological environment is also more serious.

Therefore, a kind of micro-capacitance sensor control program is needed badly, to solve the problems of the technologies described above.

Summary of the invention

The present invention is directed to above shortcomings in prior art, provide a kind of micro grid control system, during in order to solve micro-capacitance sensor isolated power grid, micro-capacitance sensor construction, O&M cost are high, the problem large to eco-environmental impact.

The present invention, for solving the problems of the technologies described above, adopts following technical scheme:

The invention provides a kind of micro grid control system, comprise: EMS, detection system and micro-grid system, micro-grid system comprises: photovoltaic generation unit, wind power generation unit, energy-storage units and important load, and detection system is for detecting the remaining capacity SOC of energy-storage units, the photovoltaic combining inverter operation active-power P of photovoltaic generation unit _pVt the blower fan combining inverter of (), wind power generation unit runs active-power P _wP(t) and important load active-power P _l1(t), described micro-grid system also comprises miniature combustion engine generator unit;

EMS is used for, and when micro-grid system isolated power grid, receives SOC detected value, P that detection system sends _l1(t), P _pV(t) and P _wPt (), by SOC detected value and the SOC upper limit SOC preset _maxwith SOC lower limit SOC _mincompare, and calculate P _pV(t) and P _wP(t) sum; And, according to comparative result, P _pV(t) and P _wP(t) sum and P _l1t (), controls miniature combustion engine generator unit and starts, or, according to comparative result, P _pV(t) and P _wP(t) sum, P _l1the specified active-power P of PCS of (t) and default energy-storage units _lSmax, control miniature combustion engine generator unit and start.

Further, described micro-grid system also comprises general controllable burden;

Described EMS specifically for, when judging that SOC detected value is less than or equal to SOC _mintime, excise general controllable burden, calculate P _pV(t) and P _wP(t) sum, and by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is less than P _l1t (), then control miniature combustion engine generator unit and start; When judging that SOC detected value is greater than SOC _minand be less than SOC _maxtime, calculate P _pV(t) and P _wPt () sum, by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is less than P _l1t (), then calculate P _l1(t) and P _lSmaxdifference, and by described P _pV(t) and P _wP(t) sum and described P _l1(t) and P _lSmaxdifference compare, if described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _lSmaxdifference, then control miniature combustion engine generator unit and start.

Further, described micro-grid system also comprises general controllable burden;

Described EMS also for, control miniature combustion engine generator unit according to described comparative result and close, or, according to described comparative result, P _pV(t) and P _wP(t) sum, P _l1(t) and the specified active-power P of general controllable burden preset _l2max, control miniature combustion engine generator unit and close.

Preferably, described EMS specifically for, when judging that SOC detected value is more than or equal to SOC _maxtime, control miniature combustion engine generator unit and close, calculate P _pV(t) and P _wP(t) sum, and by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is more than or equal to P _l1(t), then the general controllable burden of control section drops into described micro-grid system; When judging that SOC detected value is greater than SOC _minand be less than SOC _max, and described P _pV(t) and P _wPt () sum is more than or equal to P _l1time (t), calculate P _l1(t) and P _l2maxsum, and by described P _pV(t) and P _wP(t) sum and described P _l1(t) and P _l2maxsum is compared, if described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _l2maxsum, then controls miniature combustion engine generator unit and close, and the general controllable burden of control section drops into described micro-grid system.

Further, described EMS also for, if described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t) and P _l2maxsum, then calculate P _l1(t), P _l2maxand P _lSmaxsum, and by described P _pV(t) and P _wP(t) sum and describedly calculate P _l1(t), P _l2maxand P _lSmaxsum is compared, if described P _pV(t) and P _wPt () sum is less than described P _l1(t), P _l2maxand P _lSmaxsum, then control all general controllable burdens and drop into described micro-grid system.

Further, described EMS also for, if described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t), P _l2maxand P _lSmaxsum, then the blower fan combining inverter reducing wind power generation unit runs active-power P _wP(t).

Further, described detection system also for, when micro-grid system is incorporated into the power networks, detect points of common connection PCC point active-power P _pCCt the miniature combustion engine of () and miniature combustion engine generator unit runs active-power P _dG(t);

Described EMS also for, when micro-grid system is incorporated into the power networks, receive detection system send P _pCC(t) and P _dG(t), and according to P _pCC(t), P _dG(t) and the PCC point active power upper limit P preset _pCCmax, control miniature combustion engine generator unit and close.

Preferably, described EMS specifically for, by P _pCC(t) and P _pCCmaxcompare, work as P _pCCt () is more than or equal to P _pCCmaxtime, judge P _dGt whether () be greater than 0, if P _dGt () is greater than 0, then control miniature combustion engine generator unit and close.

Further, described detection system also for, detect energy-storage units grid-connected power P b (t);

Described EMS also for, after control miniature combustion engine generator unit is closed, by P _pCC(t) and P _pCCmaxcompare, if P _pCCt () is more than or equal to P _pCCmax, then regulate the grid-connected power P b (t) of energy-storage units, and by Pb (t) and the energy-storage units rated power-P under the charged state arranged _cnett () is compared, if Pb (t) is less than-P _cnett (), then control energy-storage units with rated power operation, by grid-connected for photovoltaic generation unit power P _vt () is reduced to 0, and by P _pCC(t) and P _pCCmaxcompare, if P _pCCt () is more than or equal to P _pCCmax, then by grid-connected for wind power generation unit power P _wt () is reduced to 0.

Further, described detection system also for, detect energy-storage units grid-connected power P b (t) and the grid-connected power P of wind power generation unit _w(t);

Described EMS also for, when micro-grid system is incorporated into the power networks, receive detection system send P _pCC(t), P _w(t) and Pb (t), and according to P _pCC(t), P _w(t), Pb (t), the PCC point active power lower limit P preset _pCCminwith the energy-storage units rated power P under the discharge condition arranged _cnett (), controls miniature combustion engine generator unit and starts.

Preferably, described EMS specifically for, work as P _pCCt () is less than or equal to P _pCCmintime, if judge P _wt () is 0, then control wind power generation unit and start, and judge whether wind power generation unit is in MPPT pattern, if so, then by P _pCC(t) and P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then the grid-connected power P of photovoltaic generation unit is judged _vt whether () be 0, if so, then starts photovoltaic generation unit, and judge whether photovoltaic generation unit is in MPPT pattern, if so, then by P _pCC(t) and P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then regulate the grid-connected power P b (t) of energy-storage units, and by Pb (t) and the energy-storage units rated power P under the discharge condition arranged _cnett () is compared, if Pb (t) is greater than P _cnett (), then control energy-storage units with P _cnett () is run, and control the startup of miniature combustion engine generator unit.

The present invention by arranging miniature combustion engine generator unit in micro-grid system, during micro-grid system isolated power grid, if photovoltaic generation unit and wind power generation unit undercapacity, miniature combustion engine generator unit can be started, with thinking that load provides supply of electric power, the stored energy capacitance of the storage battery of energy-storage units can be reduced, thus reduce environmental pollution, reduce micro-capacitance sensor construction and O&M cost, improve the reliability of micro-capacitance sensor isolated power grid.

Accompanying drawing explanation

The system construction drawing of the micro grid control system that Fig. 1 provides for the embodiment of the present invention;

The schematic diagram of the micro-capacitance sensor isolated power grid control flow 1 that Fig. 2 provides for the embodiment of the present invention;

The schematic diagram of the micro-capacitance sensor isolated power grid control flow 2 that Fig. 3 provides for the embodiment of the present invention;

The schematic diagram of the micro-capacitance sensor isolated power grid control flow 3 that Fig. 4 provides for the embodiment of the present invention;

The schematic diagram of the micro-grid connection operation control flow 4 that Fig. 5 provides for the embodiment of the present invention;

The schematic diagram of the micro-grid connection operation control flow 5 that Fig. 6 provides for the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the present invention, carry out clear, complete description to the technical scheme in the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.

The present invention by arranging miniature combustion engine generator unit in micro-grid system, relation between energy-storage units and miniature combustion engine generator unit is coordinated, namely according to the change of the active power of photovoltaic generation unit, wind power generation unit and load and the dump energy of energy-storage units, control running status and the power output of miniature combustion engine generator unit, to reduce the stored energy capacitance of energy-storage units.

The system architecture schematic diagram of the micro grid control system that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1, this micro grid control system comprises: EMS 1, detection system 2 and micro-grid system 3, micro-grid system 3 comprises: photovoltaic generation unit 31, wind power generation unit 32, energy-storage units 33 and important load 34, and detection system 2 is for detecting the remaining capacity SOC of energy-storage units 33, the photovoltaic combining inverter operation active-power P of photovoltaic generation unit 31 _pVt the blower fan combining inverter of (), wind power generation unit 32 runs active-power P _wP(t) and important load active-power P _l1t (), described micro-grid system 3 also comprises miniature combustion engine generator unit 35.Preferably, micro-grid system 3 can also comprise general controllable burden 36, and accordingly, detection system 2 is also for detecting general controllable burden active-power P _l2(t).

Micro grid control system of the present invention is ac bus system, the plant-grid connection same 380V ac bus such as photovoltaic generation unit 31, wind power generation unit 32, energy-storage units 33, miniature combustion engine generator unit 35, and important load 34 and general controllable burden 36 also access same 380V ac bus, micro-grid system 3 can pass through grid-connection cabinet (not illustrating in figure) and be connected with bulk power grid.

Start the features such as fast, noise is little, controllability is good because miniature combustion engine has, in the area of natural gas supply abundance, miniature combustion engine can be used as reliable back-up source.That is, photovoltaic generation unit 31, wind power generation unit 32, energy-storage units 33 and miniature combustion engine generator unit 35 all can be used as the power supply of micro-grid system 3, for important load and/or general controllable burden are powered.Wherein, energy-storage units 33 is when micro-grid system 3 power fluctuation is larger, can export fast or absorbed power is stablized to keep micro-grid system, miniature combustion engine generator unit 35 can provide long-term electric power support when photovoltaic generation unit 31 and wind power generation unit 32 export deficiency.

Micro-grid system 3 can isolated power grid, also can be incorporated into the power networks with bulk power grid, and micro-grid system 3 utilizes energy storage two way convertor PCS to realize from grid-connected seamless switching, and stabilizes fluctuation when power supply or sudden load change.

Following parameter can be preset with in EMS 1:

1, the dump energy upper limit SOC of energy-storage units _maxwith the dump energy lower limit SOC of energy-storage units _min;

2, the specified active-power P of the PCS of energy-storage units _lSmax;

3, the general specified active-power P of controllable burden _l2max;

4, PCC point active power upper limit P _pCCmaxwith PCC point active power lower limit P _pCCmin.

Below respectively to during micro-capacitance sensor isolated power grid and when being incorporated into the power networks, the control procedure of micro grid control system is described respectively.

During micro-capacitance sensor isolated power grid, grid-connected K switch 9 disconnects, and the photovoltaic generation unit 31 in micro-grid system 3 and wind power generation unit 32 are all with the generating of maximum power operational mode, and the power shortage of micro-grid system is balanced by PCS, and miniature combustion engine is in stand-by power supply state.

EMS 1 receive detection system 2 send SOC detected value after, by SOC detected value respectively with SOC _minand SOC _maxcompare, if SOC detected value is less than or equal to SOC _min, then control flow 1 (control flow 1 describes in detail follow-up again) is performed, if SOC detected value is greater than SOC _minand be less than SOC _max, then control flow 2 (control flow 2 describes in detail follow-up again) is performed, if SOC detected value is more than or equal to SOC _max, perform control flow 3 (control flow 3 describes in detail follow-up again).

When micro-grid system 3 isolated power grid, EMS 1 can receive SOC detected value, the P that detection system 2 sends _l1(t), P _pV(t) and P _wPt (), by SOC detected value and the SOC upper limit SOC preset _maxwith SOC lower limit SOC _mincompare, and calculate P _pV(t) and P _wP(t) sum; And, according to comparative result, P _pV(t) and P _wP(t) sum and P _l1t (), controls miniature combustion engine generator unit 35 and starts.

Below in conjunction with Fig. 2 and Fig. 1, describe control flow 1 in detail.As shown in Figure 2, in micro-capacitance sensor isolated power grid process, when EMS 1 judges that SOC detected value is less than or equal to SOC _mintime, perform control flow 1, this control flow 1 comprises the following steps:

Step 201, excises general controllable burden.

Concrete, when EMS 1 judges that SOC detected value is less than or equal to SOC _mintime, illustrate that the dump energy of now energy-storage units 33 is too low, in order to ensure the normal work of important load 34, EMS 1 controls the general controllable burden 36 of excision, no longer powers for general controllable burden 36 to make energy-storage units 33.

Step 202, calculates P _pV(t) and P _wP(t) sum.

Concrete, the photovoltaic combining inverter of the photovoltaic generation unit that EMS 1 sends according to detection system 2 runs active-power P _pVt the blower fan combining inverter of () and wind power generation unit runs active-power P _wPt (), calculates P _pV(t) and P _wP(t) sum.

Step 203, by P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is less than P _l1t (), then perform step 204, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges P _pV(t) and P _wPt () sum is less than P _l1(t), illustrate that now photovoltaic generation unit 31 cannot meet important load with the power output sum of wind power generation unit 32, energy-storage units 33 is in discharge condition, therefore, need other power supplys to provide electric power, then start miniature combustion engine generator unit (namely performing step 204).

If EMS 1 judges P _pV(t) and P _wPt () sum is greater than P _l1(t), illustrate that now energy-storage units 33 is in charged state, then EMS 1 keeps the state of current each power supply (i.e. photovoltaic generation unit and wind power generation unit) and load (i.e. important load 34 and general controllable burden 36) constant, to make energy-storage units 33 charge operation.

Step 204, controls miniature combustion engine generator unit and starts.

Concrete, EMS 1 controls miniature combustion engine and starts, thus startup miniature combustion engine generator unit 35 is incorporated into the power networks.

When micro-grid system 3 isolated power grid, EMS 1 can receive SOC detected value, the P that detection system 2 sends _l1(t), P _pV(t) and P _wPt (), by SOC detected value and the SOC upper limit SOC preset _maxwith SOC lower limit SOC _mincompare, and calculate P _pV(t) and P _wPt () sum, according to comparative result, P _pV(t) and P _wP(t) sum, P _l1the specified active-power P of PCS of (t) and default energy-storage units _lSmax, control miniature combustion engine generator unit 35 and start.And, according to described comparative result, P _pV(t) and P _wP(t) sum, P _l1(t) and the specified active-power P of general controllable burden preset _l2max, control miniature combustion engine generator unit 35 and close.

Below in conjunction with Fig. 3 and Fig. 1, describe control flow 2 in detail.As shown in Figure 3, in micro-capacitance sensor isolated power grid process, when EMS 1 judges that SOC detected value is greater than SOC _minand be less than SOC _maxtime, perform control flow 2, this control flow 2 comprises the following steps:

Step 301, calculates P _pV(t) and P _wP(t) sum.

Step 302, by P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is less than P _l1t (), then perform step 303, otherwise, perform step 306.

Concrete, if EMS 1 judges P _pV(t) and P _wPt () sum is less than P _l1(t), illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 cannot meet the demand of important load 34, then energy-storage units 33 discharges, to realize micro-grid system power-balance, the demand (performing step 303) of important load 34 when EMS 1 judges that energy-storage units 33 discharges with total power further, whether can be met.

If EMS 1 judges P _pV(t) and P _wPt () sum is more than or equal to P _l1(t), illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 can meet the demand of important load 34, then can judge whether further to meet the demand of important load 34 and the demand of general controllable burden 36, namely perform step 307 and subsequent step.

Step 303, calculates P _l1(t) and P _lSmaxdifference.

Step 304, by described P _pV(t) and P _wP(t) sum and described P _l1(t) and P _lSmaxdifference compare, if P _pV(t) and P _wPt () sum is less than P _l1(t) and P _lSmaxdifference, then perform step 305, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _lSmaxdifference, illustrating that now energy-storage units 33 also cannot meet the demand of important load 34 with total power electric discharge, therefore, in order to realize the power-balance of micro-grid system 3, needing to start miniature combustion engine generator unit 35 (namely performing step 305).

If EMS 1 judges described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t) and P _lSmaxdifference, illustrate that now energy-storage units 33 can meet the demand of important load 34 with total power electric discharge, then keep the state of current each power supply and load constant, to maintain the power-balance of micro-grid system 3.

Step 305, controls miniature combustion engine generator unit and starts.

Step 306, calculates P _l1(t) and P _l2maxsum.

Concrete, when EMS 1 judges P _pV(t) and P _wPt () sum is more than or equal to P _l1time (t), calculate P _l1(t) and P _l2maxsum.

Step 307, by described P _pV(t) and P _wP(t) sum and described P _l1(t) and P _l2maxsum is compared, if described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _l2maxsum, then perform step 308, otherwise, perform step 309.

Concrete, if EMS 1 judges described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _l2maxsum, illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 cannot meet the demand of important load 34 and the demand of general controllable burden 36 simultaneously, then can close miniature combustion engine generator unit 35, and the general controllable burden of control section 36 drops into described micro-grid system 3 (namely performing step 308).

If EMS 1 judges described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t) and P _l2maxsum, illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 can meet the demand of important load 34 and the demand of general controllable burden 36 simultaneously, then can judge whether current energy-storage units 33 reaches rated power further, in order to regulate the use of each power supply or load (namely performing step 309 and subsequent step).

Step 308, controls miniature combustion engine generator unit and close, and the general controllable burden of control section drops into described micro-grid system.

Concrete, when the power output of photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 cannot meet the demand of the demand of important load 34 and general controllable burden 36 simultaneously, EMS 1 closes miniature combustion engine generator unit 35, and general for part controllable burden is dropped into micro-grid system 3, the running time of miniature combustion engine generator unit 35 can be reduced so as far as possible, be applicable to the constraint because of environment or the energy, to miniature combustion engine conditional occasion running time.

Step 309, calculates P _l1(t), P _l2maxand P _lSmaxsum.

Step 310, by described P _pV(t) and P _wP(t) sum and described P _l1(t), P _l2maxand P _lSmaxsum is compared, if described P _pV(t) and P _wPt () sum is less than described P _l1(t), P _l2maxand P _lSmaxsum, then perform step 311, otherwise, perform step 312.

Concrete, if EMS 1 judges described P _pV(t) and P _wPt () sum is less than described P _l1(t), P _l2maxand P _lSmaxsum, illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 can meet the demand of important load 34 and the demand of general controllable burden 36 simultaneously, but energy-storage units 33 does not reach rated power, then control all general controllable burdens 36 and drop into described micro-grid system 3 (namely performing step 311).

If EMS 1 judges described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t), P _l2maxand P _lSmaxsum, illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 can meet the demand of important load 34 and the demand of general controllable burden 36 simultaneously, but energy-storage units 33 reaches rated power, then can reduce the power output (namely performing step 312) of wind power generation unit 32.

Step 311, controls all general controllable burdens and drops into described micro-grid system.

Step 312, the blower fan combining inverter reducing wind power generation unit runs active-power P _wP(t).

Described EMS 1 can also according to described SOC detected value and SOC _maxand SOC _mincomparative result control miniature combustion engine generator unit and close.

Below in conjunction with Fig. 4 and Fig. 1, describe control flow 3 in detail.As shown in Figure 4, in micro-capacitance sensor isolated power grid process, when EMS 1 judges that SOC detected value is more than or equal to SOC _maxtime, perform control flow 3, this control flow 3 comprises the following steps:

Step 401, controls miniature combustion engine generator unit and closes.

When EMS 1 judge that the current dump energy of energy-storage units 33 meets or exceeds dump energy upper in limited time, in order to reduce the running time of miniature combustion engine, then control miniature combustion engine generator unit 35 and close.

Step 402, calculates P _pV(t) and P _wP(t) sum.

Step 403, by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is greater than P _l1t (), then perform step 404, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges described P _pV(t) and P _wPt () sum is more than or equal to P _l1(t), illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 can meet the demand of important load 34, energy-storage units 33 is in charged state, then EMS 1 can drop into the general controllable burden 36 (namely performing step 404) of part.

If EMS 1 judges P _pV(t) and P _wPt () sum is less than P _l1(t), illustrate that the power output of now photovoltaic generation unit 31 and the power output sum of wind power generation unit 32 cannot meet the demand of important load 34, energy-storage units 33 is in discharge condition, and the dump energy of current energy-storage units 33 is more, and (namely SOC detected value is more than or equal to SOC _max), then EMS 1 can keep each power supply of micro-grid system 3 (i.e. photovoltaic generation unit 31 and wind power generation unit 32) and the current state of load (i.e. important load 34 and general controllable burden 36) constant, discharge to make energy-storage units 33 and run.

Step 404, the general controllable burden of control section drops into described micro-grid system.

Can be found out by above-mentioned control flow, when micro-capacitance sensor is isolated power grid, miniature combustion engine generator unit 35 is in hot stand-by duty.When the power output sum of photovoltaic generation unit 31 and wind power generation unit 32 is discontented with the demand of sufficient important load 34, first discharged by energy-storage units 33, for load provides electric power.Under the dump energy of energy-storage units 33 is lower than dump energy in limited time, control miniature combustion engine generator unit 35 to start, the power output of miniature combustion engine generator unit 35 is made to equal the charge power sum of important load power and energy-storage units 33, thus charge, again for important load 34 provides required electric power both to energy-storage units 33.

When the electricity of energy-storage units 33 to reach on dump energy in limited time, close miniature combustion engine generator unit 35, by energy-storage units 33 for load provides electric power.

When the power output sum of photovoltaic generation unit 31 and wind power generation unit 32 is greater than the demand of load, and when energy-storage units 33 has reached rated power, reduce the power output of wind power generation unit 32.

The present invention by arranging miniature combustion engine generator unit in micro-grid system, during micro-grid system isolated power grid, if photovoltaic generation unit and wind power generation unit undercapacity, miniature combustion engine generator unit can be started, with thinking that load provides supply of electric power, the stored energy capacitance of the storage battery of energy-storage units can be reduced, thus reduce environmental pollution, reduce micro-capacitance sensor construction and O&M cost, improve the reliability of micro-capacitance sensor isolated power grid.

Under micro-grid system is incorporated into the power networks pattern, micro-capacitance sensor voltage and frequency can be ensured by main electrical network, are described in detail respectively below from meritorious-FREQUENCY CONTROL and idle-voltage control two aspect to the control procedure that micro-grid system is incorporated into the power networks.

When micro-grid system is incorporated into the power networks, meritorious Power Exchange is there is between micro-capacitance sensor and bulk power grid, and this power direction be bidirectional flow to, for ensureing that micro-capacitance sensor secure accessing runs, need according to local power distribution network concrete condition, setting micro-capacitance sensor and bulk power grid exchange the upper lower limit value of power (upper lower limit value that micro-capacitance sensor and bulk power grid exchange power are PCC point active power upper limit P _pCCmaxwith PCC point active power lower limit P _pCCmin), micro-capacitance sensor need at above-mentioned P _pCCmaxand P _pCCminbetween exchange power bracket in run.

When micro-grid connection is run, bulk power grid normally runs, and by-pass switch K7 closes, and grid-connected K switch 9 closes, and the photovoltaic generation unit 31 now in micro-grid system 3, wind power generation unit 32 are all with maximum power output.Detection system 2 detects points of common connection PCC point active-power P in real time _pCCt (), EMS 1 receives the P that detection system 2 sends _pCCafter (t), by P _pCC(t) respectively with PCC point active power upper limit P _pCCmaxwith PCC point active power lower limit P _pCCmincompare, if P _pCCt () is more than or equal to P _pCCmax, then control flow 4 (control flow 4 describes in detail follow-up again) is performed, if P _pCCt () is less than or equal to P _pCCmin, then control flow 5 (control flow 5 describes in detail follow-up again) is performed.

Further, detection system 2 also for, detect points of common connection PCC point active-power P _pCCt the miniature combustion engine of () and miniature combustion engine generator unit runs active-power P _dG(t).EMS 1 also for, receive detection system 2 send P _pCC(t) and P _dG(t), and according to P _pCC(t), P _dG(t) and the PCC point active power upper limit P preset _pCCmax, control miniature combustion engine generator unit and close.Detection system 2 also for detecting the grid-connected power P b (t) of energy-storage units, EMS 1 also for, according to current P _pCCt () regulates the running status of each power supply in micro-grid system 3.

Below in conjunction with Fig. 5 and Fig. 1, describe control flow 4 in detail.As shown in Figure 5, in micro-grid connection running, when EMS 1 judges P _pCCt () is more than or equal to P _pCCmaxtime, perform control flow 4, this control flow 4 comprises the following steps:

Step 501, judges that the miniature combustion engine of miniature combustion engine generator unit runs active-power P _dGt whether () be greater than 0, if P _dGt () is greater than 0, then perform step 502, otherwise, perform step 504.

Concrete, if EMS 1 judges P _dGt () is greater than 0, illustrate that current miniature combustion engine generator unit 35 is in running status, then need to close miniature combustion engine generator unit 35, to reduce P _pCC(t) (namely performing step 502).

If EMS 1 judges P _dGt () is not more than 0, that is P _dGt () equals 0, illustrate that current miniature combustion engine generator unit 35 is in closed condition, then need to regulate the grid-connected power P b (t) of energy-storage units further, to reduce P _pCC(t) (namely performing step 504).

Step 502, controls miniature combustion engine generator unit and closes.

Step 503, by P _pCC(t) and P _pCCmaxcompare, if P _pCCt () is more than or equal to P _pCCmax, then perform step 504, otherwise, by P _pCC(t) and PCC point active power lower limit P _pCCmincompare, work as P _pCCt () is less than or equal to P _pCCmintime, perform control flow 5.

Concrete, if EMS 1 judges P _pCCt () is more than or equal to P _pCCmax, illustrate after closedown miniature combustion engine generator unit 35, PCC point active-power P _pCCt () is still too high, then need to regulate the grid-connected power P b (t) of energy-storage units further, to reduce P _pCC(t) (namely performing step 504).

If EMS 1 judges P _pCCt () is less than P _pCCmax, illustrate that current PCC point active power is lower than the PCC point active power upper limit, then by P _pCC(t) and PCC point active power lower limit P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then control flow 5 is performed.

Step 504, regulates the grid-connected power P b (t) of energy-storage units.

Concrete, EMS 1 can according to PCC point active power upper limit P _pCCmax, important load active-power P _l1(t), general controllable burden active-power P _l2the grid-connected power P of (t), photovoltaic generation unit _v(t) and the grid-connected power P of wind power generation unit _wt () regulates the grid-connected power P b (t) of energy-storage units.

Step 505, by Pb (t) and the energy-storage units rated power-P under the charged state arranged _cnett () is compared, if Pb (t) is less than-P _cnett (), then perform step 506, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges that Pb (t) is less than-P _cnett (), illustrates that now the grid-connected power of (under charged state) energy-storage units is beyond energy-storage units rated power, then control energy-storage units 33 with rated power operation, the low grid-connected power P of a step-down of going forward side by side _v(t) (namely performing step 506-508).

If EMS 1 judges that Pb (t) is more than or equal to-P _cnett (), illustrates that now the grid-connected power of (under charged state) energy-storage units does not exceed energy-storage units rated power, then keeps the state of current each power supply and load constant.

Step 506, controls energy-storage units with rated power operation.

Concrete, EMS 1 makes Pb (t) equal-P _cnet(t).

Step 507-508, by grid-connected for photovoltaic generation unit power P _vt () is reduced to 0.

Concrete, EMS 1 progressively lowers the grid-connected power P of photovoltaic generation unit _vt (), until be down to 0.

Step 509, by P _pCC(t) and P _pCCmaxcompare, if P _pCCt () is more than or equal to P _pCCmax, then perform step 510, otherwise, by P _pCC(t) and PCC point active power lower limit P _pCCmincompare, work as P _pCCt () is less than or equal to P _pCCmintime, perform control flow 5.

Concrete, EMS 1 is by grid-connected for photovoltaic generation unit power P _vt () is reduced to after 0, then judge current P _pCCt whether () be still more than or equal to PCC point active power upper limit P _pCCmax, if so, then limit the grid-connected power of wind-powered electricity generation generator unit (namely performing step 510-511) further.

If P _pCCt () is less than P _pCCmax, illustrate that current PCC point active power is lower than the PCC point active power upper limit, then by P _pCC(t) and PCC point active power lower limit P _pCCmincompare, at P _pCCt () is less than or equal to P _pCCmintime, perform control flow 5.

Step 510-511, by grid-connected for wind power generation unit power P _wt () is reduced to 0.

Concrete, EMS 1 progressively lowers the grid-connected power P of wind power generation unit _wt (), until be down to 0.

Further, detection system 2 also for, detect energy-storage units grid-connected power P b (t) and the grid-connected power P of wind power generation unit _w(t).EMS 1 also for, when micro-grid system is incorporated into the power networks, receive detection system 2 send P _pCC(t), P _w(t) and Pb (t), and according to P _pCC(t), P _w(t), Pb (t), the PCC point active power lower limit P preset _pCCminwith the energy-storage units rated power P under the discharge condition arranged _cnett (), controls miniature combustion engine generator unit 35 and starts.

Below in conjunction with Fig. 6 and Fig. 1, describe control flow 5 in detail.As shown in Figure 6, in micro-grid connection running, when EMS 1 judges P _pCCt () is less than or equal to P _pCCmintime, perform control flow 5, this control flow 5 comprises the following steps:

Step 601, judges P _wt whether () be 0, if P _wt () equals 0, then perform step 602, otherwise, perform step 603.

Concrete, if EMS 1 judges P _wt () is 0, illustrate that now wind power generation unit 31 is in closed condition, then start wind power generation unit 31, to improve P _pCC(t) (namely performing step 602).

If EMS 1 judges P _wt () is not 0, illustrate that now wind power generation unit 31 is in running status, then judge that whether wind power generation unit 32 is with peak power output mode operation (namely performing step 603) further.

Step 602, controls wind power generation unit and starts.

Step 603, judges whether wind power generation unit is in MPPT (MPPT maximum power point tracking) pattern, if so, then performs step 605, otherwise, perform step 604.

Concrete, if EMS 1 judges that wind power generation unit 32 is in MPPT pattern, then again judge that whether current PCC point active power is still less than or equal to PCC point active power lower limit (namely performing step 605).

If EMS 1 judges that wind power generation unit 32 is not in MPPT pattern, then control wind power generation unit 32 with MPPT mode operation (namely performing step 604).

Step 604, controls wind power generation unit with MPPT mode operation.

Step 605, by P _pCC(t) and P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then perform step 606, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges P _pCCt () is less than or equal to P _pCCmineven if illustrate that wind power generation unit 32 runs with peak power output, current PCC point active power is still too low, then judge the state (namely performing step 606) of photovoltaic generation unit further.

If EMS 1 judges P _pCCt () is greater than P _pCCmin, illustrate that current PCC point active power higher than PCC point active power lower limit, then keeps the state of current each power supply and load constant after control wind power generation unit 32 is with MPPT mode operation.

Step 606, judges the grid-connected power P of photovoltaic generation unit _vt whether () be 0, if P _vt () equals 0, then perform step 607, otherwise, perform step 608.

Concrete, if EMS 1 judges P _vt () equals 0, illustrate that current photovoltaic generation unit 31 is in closed condition, then start photovoltaic generation unit 31, to improve PCC point active power (namely performing step 607).

If EMS 1 judges P _vt () is not equal to 0, illustrate that current photovoltaic generation unit 31 is in running status, then judge that whether photovoltaic generation unit 31 is with peak power output mode operation (namely performing step 608) further.

Step 607, controls photovoltaic generation unit and starts.

Step 608, judges whether photovoltaic generation unit is in MPPT pattern, if so, then performs step 610, otherwise, perform step 609.

Concrete, if EMS 1 judges that photovoltaic generation unit 31 is in MPPT pattern, then again judge that whether current PCC point active power is still less than or equal to PCC point active power lower limit (namely performing step 610).

If EMS 1 judges that photovoltaic generation unit 31 is not in MPPT pattern, then control photovoltaic generation unit 31 with MPPT mode operation (namely performing step 609).

Step 609, controls photovoltaic generation unit with MPPT mode operation.

Step 610, by P _pCC(t) and P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then perform step 611, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges P _pCCt () is less than or equal to P _pCCmineven if illustrate that wind power generation unit 32 and photovoltaic generation unit 31 all run with peak power output, current PCC point active power is still too low, then regulate the grid-connected power P b (t) of energy-storage units (namely performing step 611) further.

If EMS 1 judges P _pCCt () is greater than P _pCCmin, illustrate control wind power generation unit 32 and photovoltaic generation unit 31 all with MPPT mode operation after, current PCC point active power higher than PCC point active power lower limit, then keeps the state of current each power supply and load constant.

Step 611, regulates the grid-connected power P b (t) of energy-storage units.

Concrete, EMS 1 can according to PCC point active power lower limit P _pCCmin, important load active-power P _l1(t), general controllable burden active-power P _l2the grid-connected power P of (t), photovoltaic generation unit _v(t) and the grid-connected power P of wind power generation unit _wt () regulates the grid-connected power P b (t) of energy-storage units.

Step 612, by Pb (t) and the energy-storage units rated power P under the discharge condition arranged _cnett () is compared, if Pb (t) is greater than P _cnett (), then perform step 613, otherwise, keep the state of current each power supply and load constant.

Concrete, if EMS 1 judges that Pb (t) is greater than P _cnet(t), illustrate that now the grid-connected power of (under discharge condition) energy-storage units is beyond energy-storage units rated power, then control energy-storage units 33 with rated power operation, and start miniature combustion engine generator unit (namely performing step 613) further.

If EMS 1 judges that Pb (t) is less than or equal to P _cnett (), illustrates that now the grid-connected power of (under discharge condition) energy-storage units does not exceed energy-storage units rated power, then keeps the state of current each power supply and load constant.

613, control energy-storage units with P _cnett () is run, and control the startup of miniature combustion engine generator unit.

Below idle-voltage control process is described in detail.

When micro-grid connection is run, the reactive power of PCC point can have an impact to the voltage of PCC point, in order to ensure micro-capacitance sensor secure accessing bulk power grid, need to PCC point idle-voltage controls, preferably, can adopt and determine power factor controlling mode and control.

Determine power factor controlling mode to refer to, in micro-grid connection running, active power operates between upper lower limit value.Then in this interval, the power factor of PCC point remains in set point to be run, if it is cos (φ) that EMS arranges PCC point power factor, and now the active power of PCC point is P _pCC(t).

EMS 1 calculates energy-storage system reactive power Q _b(t), and the energy-storage system reactive power Q that will calculate _bt () sends to energy-storage units 33, to control energy-storage units 33 according to this energy-storage system reactive power Q _bt () regulates.

If cos (φ) > 0, the reactive power source in micro-grid system is energy-storage system, energy-storage system reactive power Q _bt () can calculate according to formula (1) and obtain:

$Q_b\left(t\right)=Q_{\mathrm{PCC}}\left(t\right)=\sqrt{{\left(\frac{P_{\mathrm{PCC}}\left(t\right)}{\cos \left(\mathrm{\&phi;}\right)}\right)}^2-{P_{\mathrm{PCC}}}^2\left(t\right)}---\left(1\right)$

Wherein, Q _bt () is energy-storage system reactive power; Q _pCCt () is PCC point reactive power; P _pCCt () is PCC point active power.

If cos (φ) < 0, the reactive power source in micro-grid system is energy-storage system, energy-storage system reactive power Q _bt () can calculate according to formula (2) and obtain:

$Q_b\left(t\right)=Q_{\mathrm{PCC}}\left(t\right)=-\sqrt{{\left(\frac{P_{\mathrm{PCC}}\left(t\right)}{\cos \left(\mathrm{\&phi;}\right)}\right)}^2-{P_{\mathrm{PCC}}}^2\left(t\right)}---\left(2\right)$

Wherein, Q _bt () is energy-storage system reactive power; Q _pCCt () is PCC point reactive power; P _pCCt () is PCC point active power.

Micro-grid system, except aforesaid be incorporated into the power networks pattern and isolated power grid pattern, also comprises following several running status: grid-connect mode switches to lonely net pattern, lonely net pattern switches to grid-connect mode and black starting-up pattern.Black starting-up refers to that whole system is because of after fault stoppage in transit, system all has a power failure (do not get rid of isolated minor scale power net and still maintain operation), be in complete " black " state, do not rely on other web help, started by the generating set in system with self-startup ability, drive the generating set of non self starting, expand System recover scope gradually, finally realize the recovery of whole system.

The course of work of micro-grid system under the pattern of being incorporated into the power networks and isolated power grid pattern as previously mentioned, do not repeat them here, respectively lonely net pattern is switched to grid-connect mode below, lonely net pattern switches to the course of work under grid-connect mode, black starting-up pattern to be described in detail respectively.

When grid-connect mode switches to lonely net pattern, disconnect grid-connected K switch 9, simulating grid power-off, the running status of bulk power grid is now first identified by PCS, when detecting that bulk power grid is in malfunction by PCS, PCS controls the supporting static switch K8 of its PCC point and disconnects, and the mode of operation of PCS is switched to V/f control model (the voltage/frequency control model based on droop characteristic) from P-Q control model (voltage and frequency following power grid control pattern) automatic smoothing simultaneously.In handoff procedure, the running status of other power supplys is constant, thus realizes micro-grid system and be switched to lonely net pattern from grid-connect mode.

When lonely net pattern switches to grid-connect mode, closed grid-connected K switch 9, simulating grid recovering state is normal, now detect that electric network state recovers normally by PCS automatic identification technology, PCS detects the condition same period of the voltage magnitude of static switch K8 both sides, frequency and phase angle, constantly control V and the f signal self exported according to deviation simultaneously, and then realize micro-capacitance sensor autonomous system and electrical network realizes the same period.After the two meets the condition same period, PCS controls static switch K8 and closes, and the operational mode of PCS is switched to P-Q pattern from V/f pattern automatic smoothing simultaneously, completes micro-capacitance sensor orphan net and turns grid-connected switch mode.

During black starting-up, grid-connected K switch 9 disconnects, and meanwhile, in micro-grid system, all power supplys and load all disconnect with bus, require that micro-capacitance sensor possesses black start-up ability.When micro-grid system is in complete black state, in order to proterctive equipment, first all disconnected by circuit breaker, then carry out black starting-up according to certain program, therefore simulate micro-capacitance sensor by cut-off breaker and be in complete black state, all power supplys and load all depart from.Namely confirm that all panel switches K1-K6 are in off-state, then first energy-storage units 33 is started, it is made to operate in V/f pattern, set up voltage and the frequency reference value of isolated power grid, after system cloud gray model reaches stable state, other power supplys again successively in connecting system and load, finally realize the black starting-up of micro-capacitance sensor.

The present invention utilizes energy storage two way convertor to realize micro-capacitance sensor from grid-connected seamless switching, and the feature of the reliability utilizing miniature combustion engine higher and property easy to control, make it the energy providing unit becoming micro-capacitance sensor, both improve micro-capacitance sensor power supply reliability, the battery capacity of energy-storage units can be effectively reduced again, thus reduce old and useless battery environmental pollution, reduce investment operating cost, multiple new forms of energy are fully utilized, improves the adaptability of micro-grid system.Miniature combustion engine generator unit enters full load condition from cold standby state approximately needs 15 minutes, consider the needs stabilizing electrical network impact, as long as energy-storage units meets micro-capacitance sensor oepration at full load about 2 to 4 hours, just can ensure the power demand of micro-grid system, coordinate miniature combustion engine generator unit just can meet the long-time steady operation of the lonely net state of micro-capacitance sensor.

Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.

Claims (11)

1. a micro grid control system, comprise: EMS, detection system and micro-grid system, micro-grid system comprises: photovoltaic generation unit, wind power generation unit, energy-storage units and important load, and detection system is for detecting the remaining capacity SOC of energy-storage units, the photovoltaic combining inverter operation active-power P of photovoltaic generation unit _pVt the blower fan combining inverter of (), wind power generation unit runs active-power P _wP(t) and important load active-power P _l1t (), is characterized in that, described micro-grid system also comprises miniature combustion engine generator unit;

EMS is used for, and when micro-grid system isolated power grid, receives SOC detected value, P that detection system sends _l1(t), P _pV(t) and P _wPt (), by SOC detected value and the SOC upper limit SOC preset _maxwith SOC lower limit SOC _mincompare, and calculate P _pV(t) and P _wP(t) sum; And, according to comparative result, P _pV(t) and P _wP(t) sum and P _l1t (), controls miniature combustion engine generator unit and starts, or, according to comparative result, P _pV(t) and P _wP(t) sum, P _l1the specified active-power P of PCS of (t) and default energy-storage units _lSmax, control miniature combustion engine generator unit and start.

2. the system as claimed in claim 1, is characterized in that, described micro-grid system also comprises general controllable burden;

Described EMS specifically for, when judging that SOC detected value is less than or equal to SOC _mintime, excise general controllable burden, calculate P _pV(t) and P _wP(t) sum, and by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is less than P _l1t (), then control miniature combustion engine generator unit and start; When judging that SOC detected value is greater than SOC _minand be less than SOC _maxtime, calculate P _pV(t) and P _wPt () sum, by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is less than P _l1t (), then calculate P _l1(t) and P _lSmaxdifference, and by described P _pV(t) and P _wP(t) sum and described P _l1(t) and P _lSmaxdifference compare, if described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _lSmaxdifference, then control miniature combustion engine generator unit and start.

3. the system as claimed in claim 1, is characterized in that, described micro-grid system also comprises general controllable burden;

Described EMS also for, control miniature combustion engine generator unit according to described comparative result and close, or, according to described comparative result, P _pV(t) and P _wP(t) sum, P _l1(t) and the specified active-power P of general controllable burden preset _l2max, control miniature combustion engine generator unit and close.

4. system as claimed in claim 3, is characterized in that, described EMS specifically for, when judging that SOC detected value is more than or equal to SOC _maxtime, control miniature combustion engine generator unit and close, calculate P _pV(t) and P _wP(t) sum, and by described P _pV(t) and P _wP(t) sum and P _l1t () is compared, if described P _pV(t) and P _wPt () sum is more than or equal to P _l1(t), then the general controllable burden of control section drops into described micro-grid system; When judging that SOC detected value is greater than SOC _minand be less than SOC _max, and described P _pV(t) and P _wPt () sum is more than or equal to P _l1time (t), calculate P _l1(t) and P _l2maxsum, and by described P _pV(t) and P _wP(t) sum and described P _l1(t) and P _l2maxsum is compared, if described P _pV(t) and P _wPt () sum is less than described P _l1(t) and P _l2maxsum, then controls miniature combustion engine generator unit and close, and the general controllable burden of control section drops into described micro-grid system.

5. system as claimed in claim 4, is characterized in that, described EMS also for, if described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t) and P _l2maxsum, then calculate P _l1(t), P _l2maxand P _lSmaxsum, and by described P _pV(t) and P _wP(t) sum and describedly calculate P _l1(t), P _l2maxand P _lSmaxsum is compared, if described P _pV(t) and P _wPt () sum is less than described P _l1(t), P _l2maxand P _lSmaxsum, then control all general controllable burdens and drop into described micro-grid system.

6. system as claimed in claim 5, is characterized in that, described EMS also for, if described P _pV(t) and P _wPt () sum is more than or equal to described P _l1(t), P _l2maxand P _lSmaxsum, then the blower fan combining inverter reducing wind power generation unit runs active-power P _wP(t).

7. the system as described in any one of claim 1-6, is characterized in that, described detection system also for, when micro-grid system is incorporated into the power networks, detect points of common connection PCC point active-power P _pCCt the miniature combustion engine of () and miniature combustion engine generator unit runs active-power P _dG(t);

Described EMS also for, when micro-grid system is incorporated into the power networks, receive detection system send P _pCC(t) and P _dG(t), and according to P _pCC(t), P _dG(t) and the PCC point active power upper limit P preset _pCCmax, control miniature combustion engine generator unit and close.

8. system as claimed in claim 7, is characterized in that, described EMS specifically for, by P _pCC(t) and P _pCCmaxcompare, work as P _pCCt () is more than or equal to P _pCCmaxtime, judge P _dGt whether () be greater than 0, if P _dGt () is greater than 0, then control miniature combustion engine generator unit and close.

9. system as claimed in claim 8, is characterized in that, described detection system also for, detect the grid-connected power P b (t) of energy-storage units;

Described EMS also for, after control miniature combustion engine generator unit is closed, by P _pCC(t) and P _pCCmaxcompare, if P _pCCt () is more than or equal to P _pCCmax, then regulate the grid-connected power P b (t) of energy-storage units, and by Pb (t) and the energy-storage units rated power-P under the charged state arranged _cnett () is compared, if Pb (t) is less than-P _cnett (), then control energy-storage units with rated power operation, by grid-connected for photovoltaic generation unit power P _vt () is reduced to 0, and by P _pCC(t) and P _pCCmaxcompare, if P _pCCt () is more than or equal to P _pCCmax, then by grid-connected for wind power generation unit power P _wt () is reduced to 0.

10. system as claimed in claim 8, is characterized in that, described detection system also for, detect the grid-connected power P b (t) of energy-storage units and the grid-connected power P of wind power generation unit _w(t);

Described EMS also for, when micro-grid system is incorporated into the power networks, receive detection system send P _pCC(t), P _w(t) and Pb (t), and according to P _pCC(t), P _w(t), Pb (t), the PCC point active power lower limit P preset _pCCminwith the energy-storage units rated power P under the discharge condition arranged _cnett (), controls miniature combustion engine generator unit and starts.

11. systems as claimed in claim 10, is characterized in that, described EMS specifically for, work as P _pCCt () is less than or equal to P _pCCmintime, if judge P _wt () is 0, then control wind power generation unit and start, and judge whether wind power generation unit is in MPPT pattern, if so, then by P _pCC(t) and P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then the grid-connected power P of photovoltaic generation unit is judged _vt whether () be 0, if so, then starts photovoltaic generation unit, and judge whether photovoltaic generation unit is in MPPT pattern, if so, then by P _pCC(t) and P _pCCmincompare, if P _pCCt () is less than or equal to P _pCCmin, then regulate the grid-connected power P b (t) of energy-storage units, and by Pb (t) and the energy-storage units rated power P under the discharge condition arranged _cnett () is compared, if Pb (t) is greater than P _cnett (), then control energy-storage units with P _cnett () is run, and control the startup of miniature combustion engine generator unit.