CN104079008A - Power supply method and system based on microgrid - Google Patents
Power supply method and system based on microgrid Download PDFInfo
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- CN104079008A CN104079008A CN201410293608.8A CN201410293608A CN104079008A CN 104079008 A CN104079008 A CN 104079008A CN 201410293608 A CN201410293608 A CN 201410293608A CN 104079008 A CN104079008 A CN 104079008A
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Abstract
The invention discloses a power supply method and system based on a microgrid. The system comprises a clean energy power generation system (100), the microgrid and an alternating-current load (400) located in a power supply area. The microgrid comprises multiple VF source energy storage converters (200) and multiple PQ source energy storage converters (300) connected with the VF source energy storage converters (200) in parallel and controlled by the VF source energy storage converters (200). The VF source energy storage converters (200) are used for supplying power to the alternating-current load (400) having access to the microgrid when the current total demanded power of the alternating-current load (400) does not exceed practical maximum output power of the alternating-current load (400). The PQ source energy storage converters are selected to be started by the VF source energy storage converters (200) when the current total demanded power of the alternating-current load (400) exceeds the practical maximum output power of the alternating-current load (400) to supply power for the alternating-current load (400) through the built expanded microgrid. Operation stability of the power supply system can be improved, and the service life of the PQ source energy storage converters is prolonged.
Description
Technical field
The present invention relates to electric power network technique field, more particularly, relate to a kind of method of supplying power to and electric power system based on micro-electrical network.
Background technology
In the prior art, for effectively solving the customer power supply problem of areas without electricity, habitual solution is at areas without electricity in the industry, by the method structure micro power network of a plurality of VF source energy accumulation current converter parallel connection, and is areas without electricity customer power supply by the micro power network building.
The above-mentioned micro power network being built by VF source energy accumulation current converter parallel way, when capacity requirement is increasing, only has the capacity by continuous increase number of units in parallel or increase unit VF source energy accumulation current converter to meet.Yet, the mode that the quantity of the VF source energy accumulation current converter by one-sided increase parallel connection or capacity carry out dilatation to micro-electrical network is subject to technical limitations (increase for now parallel operation number of units or increase capacity is all subject to certain restrictions), be that micro-electrical network design capacity is limited, cannot meet the requirement of areas without electricity large user group's (for example remote county town, island) concentration supply power.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of method of supplying power to and electric power system based on micro-electrical network.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of method of supplying power to based on micro-electrical network, described micro-electrical network comprises a plurality of VF source energy accumulation current converter and a plurality of PQ source energy accumulation current converter in parallel; The method comprises the steps:
S1) start all VF source energy accumulation current converter in micro-electrical network, and power for accessing the AC load of this micro-electrical network by described VF source energy accumulation current converter;
S2) when the current aggregate demand power of described AC load exceeds the actual peak power output of described VF source energy accumulation current converter, one or more PQ source energy accumulation current converter of opening in micro-electrical network by described VF source energy accumulation current converter carries out dilatation to micro-electrical network, and the AC load centrally connected power supply that is power supply area of the micro-electrical network by dilatation.
In the above-mentioned method of supplying power to based on micro-electrical network of the present invention, described in each, PQ source energy accumulation current converter has at least one the 2nd PCS unit, and each VF source energy accumulation current converter has at least one PCS unit; Before described step S1, also comprise the steps:
S0) by each PCS unit of the described VF source that is pre-stored in for No. ID energy accumulation current converter of all the 2nd PCS unit of all PQ source energy accumulation current converter, and specify one as main PCS unit in all PCS unit; Described main PCS unit is used for carrying out power division between the VF source energy accumulation current converter at this place, main PCS unit and described a plurality of PQ source energy accumulation current converter, and according to power distribution result, described a plurality of PQ source energy accumulation current converter is carried out to switching on and shutting down control.
In the above-mentioned method of supplying power to based on micro-electrical network of the present invention, described step S2 also comprises: described main PCS first calculates unit the actual peak power output of described VF source energy accumulation current converter, the more current aggregate demand power of the AC load of the actual peak power output of described VF source energy accumulation current converter and power supply area is compared;
Wherein, P
vFoutput=W*P
vF; P
vFoutputfor the actual peak power output of described VF source energy accumulation current converter, W is the actual peak power output of described VF source energy accumulation current converter and the percentage of rated output power, P
vFrated output power for described VF source energy accumulation current converter;
As described in the current aggregate demand power of main PCS unit judges AC load be no more than as described in the actual peak power output of VF source energy accumulation current converter, return to step S1.
In the above-mentioned method of supplying power to based on micro-electrical network of the present invention, the energy accumulation current converter of VF source described in described step S2 is opened the step that the one or more PQ source energy accumulation current converter in micro-electrical network carries out dilatation to micro-electrical network and is comprised:
S21) described main PCS unit calculates the quantity X that needs the PQ source energy accumulation current converter of unlatching in micro-electrical network by preset power distribution algorithm;
Select No. ID, X group the 2nd PCS unit at random in No. ID, many groups of the 2nd PCS unit that S22) described main PCS unit prestores at it, and part or all of the 2nd PCS unit in X group the 2nd PCS unit corresponding to No. ID, this X group the 2nd PCS unit sends start-up command, to open X the PQ source energy accumulation current converter that comprises this X group the 2nd PCS unit;
S23) described X PQ source energy accumulation current converter and with it described VF source energy accumulation current converter in parallel jointly form micro-electrical network of current aggregate demand power that peak power output can reach the AC load of power supply area.
In the above-mentioned method of supplying power to based on micro-electrical network of the present invention, as follows for calculating the power distribution algorithm of quantity X of the PQ source energy accumulation current converter of need opening in described step S21:
X=(P
demandpower-η * m*a*P
pcs1)/(η * b*P
pcs2); Wherein,
P
demandpowercurrent aggregate demand power for the AC load of power supply area;
M is the quantity of the VF source energy accumulation current converter in micro-electrical network;
A is the quantity of the PCS unit that comprises of VF source energy accumulation current converter;
P
pCS1rated output power for a described PCS unit;
η is the percentage interval range of the acceptable real output of micro-electrical network and rated output power;
B is the quantity of the 2nd PCS unit that comprises of PQ source energy accumulation current converter;
P
pCS2rated output power for described the 2nd PCS unit.
In the above-mentioned method of supplying power to based on micro-electrical network of the present invention, described step S2 also comprises: when judging whether described main PCS unit breaks down and breaking down in described main PCS unit, in all PCS unit that comprise at described VF source energy accumulation current converter, select except this PCS unit of any one main PCS unit, and new main PCS unit is appointed as to substitute the former main PCS unit breaking down in a PCS unit.
In the above-mentioned method of supplying power to based on micro-electrical network of the present invention, after described step S2, also comprise the steps:
S3) when the current aggregate demand power of AC load declines the power output of at least one the 2nd PCS unit, according to power distribution algorithm, calculate the quantity X ' of the PQ source energy accumulation current converter that need close down, the random selection individual PQ of X ' source energy accumulation current converter in the X having started a PQ source energy accumulation current converter, and operation is closed down in part or all of the 2nd PCS unit execution of the individual PQ of this X ' of instruction source energy accumulation current converter.
The present invention also constructs a kind of electric power system based on micro-electrical network, described system comprises clean energy resource electricity generation system, micro-electrical network and the AC load that is positioned at power supply area, and described micro-electrical network comprises a plurality of VF source energy accumulation current converter and in parallel with described VF source energy accumulation current converter and be controlled by a plurality of PQ source energy accumulation current converter of this VF source energy accumulation current converter;
Described VF source energy accumulation current converter is for when the current aggregate demand power of AC load is no more than its actual peak power output, for accessing the AC load power supply of micro-electrical network;
Described a plurality of PQ source energy accumulation current converter is selected when the current aggregate demand power of AC load surpasses the actual peak power output of VF source energy accumulation current converter by described VF source energy accumulation current converter respectively to open, and the micro-electrical network of setting up dilatation of take is that AC load is powered.
In the above-mentioned electric power system based on micro-electrical network of the present invention, described in each, VF source energy accumulation current converter comprises a PCS unit of one group of parallel connection, and described in each, PQ source energy accumulation current converter includes the 2nd PCS unit of one group of parallel connection;
A described PCS unit comprises a main PCS unit, and this main PCS unit comprises master controller, the first rectifier being electrically connected to respectively with described master controller, the first inverter and the first storage battery;
Described in each the 2nd PCS unit include from controller, with described the second rectifier being electrically connected to respectively from controller, the second inverter and the second storage battery;
When described master controller surpasses the actual peak power output of described VF source energy accumulation current converter for the current aggregate demand power in AC load, to sending start-up command from controller described at least one;
Described master controller is also when judging that power difference between the peak power output of the micro-electrical network after dilatation and the current aggregate demand power of AC load meets or exceeds the power output of the 2nd PCS unit described at least one, to sending shutdown command from controller described at least one;
Described from controller when receiving the start/shutdown command of described master controller, open/close down this from the 2nd PCS unit at controller place.
In the above-mentioned electric power system based on micro-electrical network of the present invention, described VF source energy accumulation current converter and described in each the communication mode between the energy accumulation current converter of PQ source comprise RS485, Ethernet, CAN bus, PLC and ZigBee.
Owing to the present invention is based on the method for supplying power to of micro-electrical network and electric power system, adopted by increasing quantity in parallel with VF source energy accumulation current converter and that be controlled by the PQ source energy accumulation current converter of VF source energy accumulation current converter and micro-electrical network has been carried out to the technical scheme of unlimited dilatation, so overcome the one-sided number of units that increases VF source energy accumulation current converter in prior art or capacity, micro-electrical network is carried out to the defect that the mode of dilatation is restricted, realized the unlimited dilatation of micro-net capacity, the automatic adjusting of micro-electrical network power output, and the stability that improves electric power system operation, reduce the power consumption of electric power system, the object that extends the useful life of PQ source energy accumulation current converter.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the first structural representation of the electric power system based on micro-electrical network that provides of preferred embodiment of the present invention;
Fig. 2 is the second structural representation of the electric power system based on micro-electrical network that provides of preferred embodiment of the present invention;
Fig. 3 is the structured flowchart of main PCS unit/any one PCS unit of the electric power system based on micro-electrical network shown in Fig. 1 or Fig. 2;
Fig. 4 is the structured flowchart of any one the 2nd PCS unit of the electric power system based on micro-electrical network shown in Fig. 1 or Fig. 2;
Fig. 5 is the flow chart of the method for supplying power to based on micro-electrical network that provides of preferred embodiment of the present invention.
Embodiment
In order to solve the number of units of the one-sided increase VF source energy accumulation current converter 200 existing in prior art or capacity, micro-electrical network is carried out to the defect that the mode of dilatation is restricted, main innovate point of the present invention is: 1) by increasing quantity in parallel with VF source energy accumulation current converter 200 and that be controlled by the PQ source energy accumulation current converter 300 of VF source energy accumulation current converter 200, micro-electrical network is carried out to unlimited dilatation; 2) the main PCS unit 201 in VF source energy accumulation current converter 200 can carry out according to the variation of the aggregate demand power of the AC load 400 of power supply area power division adjusting flexibly between the VF source at these 201 places, PCS unit energy accumulation current converter 200 and a plurality of PQ source energy accumulation current converter 300, according to the power output of PQ source energy accumulation current converter 300, distribute amount correspondingly to open or close down part PQ source energy accumulation current converter 300, to reduce system power dissipation, realize the maximum using of system resource.
Because having adopted by increasing quantity in parallel with VF source energy accumulation current converter 200 and that be controlled by the PQ source energy accumulation current converter 300 of VF source energy accumulation current converter 200, the present invention micro-electrical network is carried out to the design of unlimited dilatation, so solved in prior art number of units by one-sided increase VF source energy accumulation current converter 200 or capacity, micro-electrical network is carried out to the technical problem that the mode of dilatation is restricted, realized the unlimited dilatation of micro-net capacity, the automatic adjusting of micro-electrical network power output, and the stability that improves electric power system operation, reduce the power consumption of electric power system, the object that extends the useful life of PQ source energy accumulation current converter 300.
In order to make object of the present invention clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the electric power system that the present invention is based on micro-electrical network comprises clean energy resource electricity generation system 100, the AC load 400 that is connected micro-electrical network of clean energy resource electricity generation system 100 and be positioned at power supply area by ac bus.This micro-electrical network comprises a plurality of VF source energy accumulation current converter 200 and in parallel with the plurality of VF source energy accumulation current converter and be controlled by a plurality of PQ source energy accumulation current converter 300 of one of them VF source energy accumulation current converter.Each VF source energy accumulation current converter 200 includes the PCS that several specifications (battery capacity, power output) are identical (Power Conversion System) unit, and each PQ source energy accumulation current converter 300 includes the 2nd PCS that several specifications (battery capacity, power output) are identical (Power Conversion System) unit.Communication mode bag RS485, Ethernet, CAN bus and PLC (Power Line Communication) between the plurality of VF source energy accumulation current converter 200 and the plurality of PQ source energy accumulation current converter 300.
This clean energy resource electricity generation system 100 is used to VF source energy accumulation current converter 200 and a plurality of PQ source energy accumulation current converter 300 in micro-electrical network to charge.
When this VF source energy accumulation current converter 200 is no more than its actual peak power output for the current aggregate demand power in AC load 400, for accessing AC load 400 power supplies of micro-electrical network;
The plurality of PQ source energy accumulation current converter 300 is selected when the current aggregate demand power of AC load 400 meets or exceeds its actual peak power output by this VF source energy accumulation current converter 200 respectively to open, and the micro-electrical network that builds dilatation of take is AC load 400 power supplies.
Wherein, P
vFoutput=w*P
vF; P
vFoutput=be the actual peak power output of VF source energy accumulation current converter 200, P
vFfor the rated output power of VF source energy accumulation current converter 200, W is the actual peak power output of VF source energy accumulation current converter 200 and the percentage of rated output power.
The difference of the electric power system based on micro-electrical network shown in the electric power system based on micro-electrical network shown in Fig. 2 of the present invention and Fig. 1 is: between VF source energy accumulation current converter 200 and a plurality of PQ source energy accumulation current converter 300, adopted ZigBee the short distance wireless communication technology, its benefit is: the problem that has overcome micro-electrical network internal wiring complexity, reduce widely the use of cable, reduced the fire incident incidence of micro-electrical network.
As shown in Figure 3, any one the VF source energy accumulation current converter in the plurality of VF source energy accumulation current converter 200 is specified one of them the Wei ZhuPCS unit, PCS unit 201 in all PCS unit 201.This main PCS unit 201 is for carrying out power division and according to power distribution result, the plurality of PQ source energy accumulation current converter 300 being carried out to switching on and shutting down control between the VF source energy accumulation current converter 200 at its place and a plurality of PQ source energy accumulation current converter 300.
In the present invention, the operation of PCS as main in this unit 201 is broken down, the VF source energy accumulation current converter 200 at this place, main PCS unit is selected at random except this PCS unit 201 of any one main PCS unit 201 in all PCS unit 201, specify a PCS unit 201 for new main PCS unit 201 is to substitute the former main PCS unit 201 breaking down, guarantee the safe and stable operation of electric power system.
This main PCS unit 201 comprises master controller 2011, the first rectifier 2012, the first inverter 2013 and the first storage battery 2014 that are electrically connected to this master controller 2011.
As shown in Figure 4, each the 2nd PCS unit 301 include from controller 3011, with the second rectifier 3012, the second inverter 3013 and the second storage battery 3014 that should be electrically connected to from controller 3011.
This first rectifier 2012/ second rectifier 3012 for future automatically cleaning energy electricity generation system 100 alternating current be converted to and be entered into the first storage battery 2014/ second storage battery 3014 after direct current and store.This first inverter 2013/ second inverter 3013 is delivered to AC load 400 by it through ac bus after being all converted to alternating current for the direct current that storage battery is provided.
When this master controller 2011 surpasses the peak power output of VF source energy accumulation current converter 200 for the current aggregate demand power in AC load 400, by power distribution algorithm, calculate the quantity of the PQ source energy accumulation current converter 300 of need opening, and from controller 3011, send start-up command to each of the 2nd PCS unit 301 of equal number.The plurality of from controller 3011 when receiving the start-up command of master controller 2011, respectively start operation is carried out in the plurality of a plurality of the 2nd PCS unit 301 from controller 3011 places.
When this master controller 2011 also declines the power output of at least one the 2nd PCS unit 301 for the current aggregate demand power in AC load 400, by power distribution algorithm, calculate the quantity of the PQ source energy accumulation current converter 300 that need close down, and from controller 3011, send shutdown command to each of the 2nd PCS unit 301 of equal number.The plurality of from controller 3011 when receiving the shutdown command of master controller 2011, respectively power-off operation are carried out in the plurality of a plurality of the 2nd PCS unit 301 from controller 3011 places.
The derivation of the above-mentioned power distribution algorithm of the present invention is as follows:
Based on energy conversion relation between micro-electrical network and AC load 400, by law of conservation of energy, can obtain following equation:
P
demandpower＝η*(m*a*P
pcs1+X*b*P
pcs2)；
Solving aforesaid equation can obtain: X=(P
demandpower-η * m*a*P
pcs1)/(η * b*P
pcs2), be power distribution algorithm formula of the present invention; Wherein,
P
demandpowercurrent aggregate demand power for the AC load 400 of power supply area;
M is the quantity of the VF source energy accumulation current converter in micro-electrical network;
X is for needing the quantity of the PQ source energy accumulation current converter 300 of unlatching;
A is the quantity of the PCS unit 201 that comprises of VF source energy accumulation current converter 200;
P
pCS1it is the rated output power of a PCS unit 201;
η is that the percentage of the acceptable real output of micro-electrical network and rated output power is interval;
B is the quantity of the PCS unit 201 that comprises of PQ source energy accumulation current converter 300;
P
pCS2it is the rated output power of the 2nd PCS unit 301.
In the better embodiment of electric power system that the present invention is based on micro-electrical network, η span is (75%, 85%), and W value is 80%.The benefit of a plurality of VF source energy accumulation current converter 200 in micro-electrical network and a plurality of PQ source energy accumulation current converter 300 equal " reserving " a part of electric energy is: contingent various electric power transfer faults between reply clean energy resource electric power system and micro-electrical network, guarantee that whole electric power system continues to run well.
Better embodiment of the present invention will take below as example, to the present invention is based on the method for supplying power to of micro-electrical network, describe:
As shown in Figure 5, in step S101, the present invention is based on 4 the PCS unit 201 (power output is 250KW) that are stored in VF source energy accumulation current converter 200 for No. ID of 4 the 2nd PCS unit 301 (power output is 500KW) that the electric power system administrative staff of micro-electrical network comprise each PQ source energy accumulation current converter 300 in advance, and in these 4 PCS unit 201, specify a main PCS unit 201 of controlling for carrying out the switching on and shutting down of power division task between VF source energy accumulation current converter 200 and a plurality of PQ source energy accumulation current converter 300 and a plurality of PQ source energy accumulation current converter 300.
In step S102, the electric power system administrative staff based on micro-electrical network first open VF source energy accumulation current converter 200, AC load 400 power supplies that are the micro-electrical network of access by VF source energy accumulation current converter 200.
In step S103, as the current aggregate demand power of the main PCS unit 201 judgement AC load 400 in VF source energy accumulation current converter 200 does not surpass the peak power output (being 1MW) of VF source energy accumulation current converter 200, return to step S102; The current aggregate demand power of PCS as main in this unit 201 judgement AC load 400 has surpassed the peak power output of VF source energy accumulation current converter 200, carries out next step S104.
In step S104, main PCS unit 201 calculates the quantity of the PQ source energy accumulation current converter 300 that needs unlatching according to its built-in power division formula.
For example: suppose η=80%, P
demandpower=10MW, P
pCS1=250KW, P
pCS2=500KW, main PCS unit 201 can be calculated X ︽ 6 according to each above-mentioned data and power distribution algorithm formula, and needing the quantity of the PQ source energy accumulation current converter 300 of unlatching is 6.
In step S105, select No. ID, 6 group of the 2nd PCS unit at random in No. ID, many groups of the 2nd PCS unit that main PCS unit 201 prestores at it, to corresponding 6 groups of the 2nd PCS unit 301, No. ID, this 6 group of the 2nd PCS unit, send start-up command simultaneously.This 6 group of the 2nd PCS unit 301 operates by receiving respectively above-mentioned start-up command and carrying out start from controller 3011 separately.
In step S106, AC load 400 power supplies that micro-electrical network that 6 PQ source energy accumulation current converters, 300 starts that are comprised of above-mentioned 6 group of the 2nd PCS unit 301 the VF source energy accumulation current converter 200 in parallel with it form dilatation is power supply area.
In step S107, while being no more than 500KW as the drop-out value of the current aggregate demand power of main PCS unit 201 judgement AC load 400, maintaining the start quantity of PQ source energy accumulation current converter 300, and return to step S106; While surpassing 500KW as the drop-out value of the current aggregate demand power of main PCS unit 201 judgement AC load 400, carry out next step S108.
In step S108, main PCS unit 201 calculates the quantity of the PQ source energy accumulation current converter 300 that need to close down by power distribution algorithm, correspondingly to reduce the power output of micro-electrical network, the power consumption of the electric power system of minimizing based on micro-electrical network, guarantee the power supply safety of power supply area, and extend the useful life of PQ source energy storage device.
The current aggregate demand power of supposing the AC load 400 of power supply area drops to 8KW, and main PCS unit 201 quantity that above-mentioned power division formula can calculate the PQ source energy accumulation current converter 300 that current needs close down according to the present invention is 1.
In step S109, main PCS unit 201 is searched corresponding to No. ID, 6 group of the 2nd PCS unit of above-mentioned 6 PQ source energy accumulation current converters 300, select No. ID, one group of the 2nd PCS unit at random in No. ID, this 6 group of the 2nd PCS unit, to this group the 2nd PCS unit, No. ID corresponding 4 the 2nd PCS unit 301 send shutdown command, to close down the PQ source energy accumulation current converter 300 being comprised of these 4 the 2nd PCS unit 301.Treat that this PQ source energy accumulation current converter 300 enters the state of closing down, and returns to step S103.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the method for supplying power to based on micro-electrical network, is characterized in that, described micro-electrical network comprises a plurality of VF source energy accumulation current converter (200) and a plurality of PQ source energy accumulation current converter (300) in parallel; The method comprises the steps:
S1) start all VF source energy accumulation current converter (200) in micro-electrical network, and AC load (400) power supply that is this micro-electrical network of access by described VF source energy accumulation current converter (200);
S2) when the current aggregate demand power of described AC load (400) exceeds the actual peak power output of described VF source energy accumulation current converter, one or more PQ source energy accumulation current converter (300) of opening in micro-electrical network by described VF source energy accumulation current converter (200) carries out dilatation to micro-electrical network, and AC load (400) centrally connected power supply that is power supply area of the micro-electrical network by dilatation.
2. the method for supplying power to based on micro-electrical network according to claim 1, it is characterized in that, described in each, PQ source energy accumulation current converter (300) has at least one the 2nd PCS unit (301), and each VF source energy accumulation current converter (200) has at least one PCS unit (201); Before described step S1, also comprise the steps:
S0) by each PCS unit (201) that is pre-stored in described VF source energy accumulation current converter (200) for No. ID of all the 2nd PCS unit (301) of all PQ source energy accumulation current converter (300), and in all PCS unit (201), specify one as main PCS unit (201); Described main PCS unit is used for carrying out power division between the VF source energy accumulation current converter (200) at this place, main PCS unit (201) and described a plurality of PQ source energy accumulation current converters (300), and according to power distribution result, described a plurality of PQ source energy accumulation current converters (300) is carried out to switching on and shutting down control.
3. the method for supplying power to based on micro-electrical network according to claim 2, it is characterized in that, described step S2 also comprises: described main PCS unit (201) first calculates the actual peak power output of described VF source energy accumulation current converter (200), the more current aggregate demand power of the AC load (400) of the actual peak power output of described VF source energy accumulation current converter (200) and power supply area is compared;
Wherein, P
vFoutput=W*P
vF; P
vFoutputfor the actual peak power output of described VF source energy accumulation current converter (200), W is the actual peak power output of described VF source energy accumulation current converter (200) and the percentage of rated output power, P
vFrated output power for described VF source energy accumulation current converter (200);
As described in the current aggregate demand power of main PCS unit (201) judgement AC load (400) be no more than as described in the actual peak power output of VF source energy accumulation current converter (200), return to step S1.
4. the method for supplying power to based on micro-electrical network according to claim 3, it is characterized in that, the energy accumulation current converter of VF source described in described step S2 (200) is opened the step that the one or more PQ source energy accumulation current converter (300) in micro-electrical network carries out dilatation to micro-electrical network and is comprised:
S21) described main PCS unit (201) calculates the quantity X that needs the PQ source energy accumulation current converter (300) of unlatching in micro-electrical network by preset power distribution algorithm;
Select No. ID, X group the 2nd PCS unit at random in No. ID, many groups of the 2nd PCS unit that S22) described main PCS unit (201) prestores at it, and part or all of the 2nd PCS unit (301) in X group the 2nd PCS unit (301) corresponding to No. ID, this X group the 2nd PCS unit sends start-up command, to open X the PQ source energy accumulation current converter (300) that comprises this X group the 2nd PCS unit (301);
S23) described X PQ source energy accumulation current converter (300) and with it in parallel described VF source energy accumulation current converter (200) jointly form micro-electrical network of the current aggregate demand power of the AC load (400) that peak power output can reach power supply area.
5. the method for supplying power to based on micro-electrical network according to claim 4, is characterized in that, as follows for calculating the power distribution algorithm of quantity X of the PQ source energy accumulation current converter (300) of need opening in described step S21:
X=(P
demandpower-η * m*a*P
pcs1)/(η * b*P
pcs2); Wherein,
P
demandpowercurrent aggregate demand power for the AC load (400) of power supply area;
M is the quantity of the VF source energy accumulation current converter in micro-electrical network;
A is the quantity of the PCS unit (201) that comprises of VF source energy accumulation current converter (200);
P
pCS1rated output power for a described PCS unit (201);
η is the percentage interval range of the acceptable real output of micro-electrical network and rated output power;
B is the quantity of the 2nd PCS unit (301) that comprises of PQ source energy accumulation current converter (300);
P
pCS2rated output power for described the 2nd PCS unit (301).
6. the method for supplying power to based on micro-electrical network according to claim 5, it is characterized in that, described step S2 also comprises: when judging whether described main PCS unit (201) breaks down and breaking down in described main PCS unit (201), in all PCS unit (201) that comprise at described VF source energy accumulation current converter (200), select except this PCS unit (201) of any one main PCS unit (201), and new main PCS unit (201) is appointed as to substitute the former main PCS unit (201) breaking down in a PCS unit (201).
7. the method for supplying power to based on micro-electrical network according to claim 6, is characterized in that, after described step S2, also comprises the steps:
S3) when the current aggregate demand power of AC load (400) declines the power output of at least one the 2nd PCS unit (301), according to power distribution algorithm, calculate the quantity X ' of the PQ source energy accumulation current converter (300) that need close down, the random selection individual PQ of X ' source energy accumulation current converter (300) in the X having started a PQ source energy accumulation current converter (300), and operation is closed down in part or all of the 2nd PCS unit (301) execution of the individual PQ of this X ' of instruction source energy accumulation current converter (300).
8. the electric power system based on micro-electrical network, it is characterized in that, the AC load (400) that described system comprises clean energy resource electricity generation system (100), micro-electrical network and is positioned at power supply area, described micro-electrical network comprises a plurality of VF source energy accumulation current converter (200) and in parallel with described VF source energy accumulation current converter (200) and be controlled by a plurality of PQ source energy accumulation current converter (300) of this VF source energy accumulation current converter (200);
When described VF source energy accumulation current converter (200) is no more than its actual peak power output for the current aggregate demand power in AC load (400), for accessing AC load (400) power supply of micro-electrical network;
Described a plurality of PQ source energy accumulation current converters (300) are selected when the current aggregate demand power of AC load (400) surpasses the actual peak power output of VF source energy accumulation current converter (200) by described VF source energy accumulation current converter (200) respectively to open, and the micro-electrical network of setting up dilatation of take is AC load (400) power supply.
9. the electric power system based on micro-electrical network according to claim 8, it is characterized in that, described in each, VF source energy accumulation current converter (200) comprises a PCS unit (201) of one group of parallel connection, and described in each, PQ source energy accumulation current converter (300) includes the 2nd PCS unit (301) of one group of parallel connection;
A described PCS unit (201) comprises a main PCS unit (201), and this main PCS unit (201) comprises master controller (2011), the first rectifier (2012) being electrically connected to respectively with described master controller (2011), the first inverter (2013) and the first storage battery (2014);
Described in each the 2nd PCS unit (301) include from controller (3011), with described the second rectifier (3012) being electrically connected to respectively from controller (3011), the second inverter (3013) and the second storage battery (3014);
When described master controller (2011) surpasses the actual peak power output of described VF source energy accumulation current converter (200) for the current aggregate demand power in AC load (400), to sending start-up command from controller (3011) described at least one;
Described master controller (2011) is also when judging that power difference between the peak power output of the micro-electrical network after dilatation and the current aggregate demand power of AC load (400) meets or exceeds the power output of the 2nd PCS unit (301) described at least one, to sending shutdown command from controller (3011) described at least one;
Described from controller (3011) when receiving the start/shutdown command of described master controller (2011), open/close down this from the 2nd PCS unit (301) at controller place.
10. the electric power system based on micro-electrical network according to claim 9, it is characterized in that, described VF source energy accumulation current converter (200) and described in each the communication mode between PQ source energy accumulation current converter (300) comprise RS485, Ethernet, CAN bus, PLC and ZigBee.
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