CN103326400B - Countercurrent-preventing protection and control method for microgrid - Google Patents
Countercurrent-preventing protection and control method for microgrid Download PDFInfo
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- CN103326400B CN103326400B CN201310252615.9A CN201310252615A CN103326400B CN 103326400 B CN103326400 B CN 103326400B CN 201310252615 A CN201310252615 A CN 201310252615A CN 103326400 B CN103326400 B CN 103326400B
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Abstract
The invention relates to a countercurrent-preventing protection and control method for a microgrid. The method comprises the following steps that (1) when Ps-P1>Pa, the method turns to a step (2); when P1-Ps>Pb, the method turns to a step (3); when -Pb<=Ps-P1<=Pa, the current state of the microgrid is kept unchanged; (2) the current capacity of an energy storage system is detected, and if the current capacity of the energy storage system does not reach the upper energy limit of the energy storage system, the method turns to a step (4); if the current capacity of the energy storage system reaches the upper energy limit of the energy storage system, the method turns to a step (5); (3) the microgrid is switched to be in a grid-connection mode, and the load gap of the microgrid is supplemented through a public supply network and the energy storage system; (4) the microgrid is switched to be in an island mode, and the energy storage system absorbs redundant distributed power generation capacity in a charging mode; (5) the microgrid is switched to be in the island mode, a controllable switch on a line connected between an additional load and an alternating current bus is powered off, and redundant power sent by the microgrid is absorbed through the additional load.
Description
Technical field
The present invention relates to a kind of counterflow-preventing protecting control method for micro-capacitance sensor, belong to distributed power generation field.
Background technology
Current, energy-saving and emission-reduction and green energy resource become the focus that the whole world is paid close attention to, simultaneously one of the construction object of Ye Shi China intelligent grid.As intelligent grid, require that it can adapt to the access of large power supply, mode that regenerative resource also will be supported to generate electricity in a distributed manner close friend access, meet the requirement of electric power and natural environment, social economy's harmonious development.
But, the features such as photovoltaic distributed power supply has intermittence, randomness, response speed is slow, inertia is little, grid-connectedly easily cause voltage fluctuation and flicker afterwards, especially when large-capacity distributing power supply is incorporated to low and medium voltage distribution network, realize the power-balance of power distribution network, and ensure that power supply reliability and the quality of power supply are comparatively difficult.In order to reduce large-scale distributed power grid to the impact of outside public electric wire net and negative effect, carrying out integrating distributed generation system by micro-capacitance sensor technology, the technical barrier of the grid-connected existence of current distributed power generation can be solved well.
Micro-capacitance sensor according to and power delivery direction, site is divided into " grid-connected do not surf the Net " and " grid-connected and surf the Net " two kinds of modes.Under " grid-connected do not surf the Net " mode, micro-grid connection point power can only be carried to micro-capacitance sensor user load by public electric wire net; Under " grid-connected and online " mode, and site power can two-way flow, and the rich power of micro-capacitance sensor can flow to public electric wire net.But for adopting " grid-connected and online " micro-capacitance sensor that mode is run, its power supply characteristic shown relative to outside public electric wire net still can cause certain influence to the stable operation of electrical network, specifically mainly contains three aspects:
The first, the quality of power supply of harmonic wave to public electric wire net that power electronic equipments a large amount of in micro-capacitance sensor produces impacts.
The second, when public electric wire net breaks down, the inverse probability that micro-capacitance sensor produces can cause damage to machinery equipment, even jeopardizes the personal safety of maintainer time serious.
3rd, due to the power supply characteristic of micro-capacitance sensor, change the feature of public electric wire net single supply, radial pattern, unidirectional trend, thus make existing current protection measures no longer applicable.
For the micro-capacitance sensor adopting " grid-connected do not surf the Net " mode to run; application number be 201210173096.2 Chinese patent disclose a kind of grid-connected micro-grid system and control method thereof of not surfing the Net; prevented by micro-capacitance sensor central controller and the reverse power protection device that is arranged on points of common connection place that inverse probability is counter to be sent; ensure whole micro-grid system only to public electric wire net power taking not to public electric wire net power transmission, thus avoid micro-capacitance sensor public electric wire net impacted.But this technology mainly exports the means of even excising distributed power source by restriction distributed power source and eliminates inverse probability, this had not both met the policy of the remaining electricity online of national requirements, also the normal operation of distributed power source is unfavorable for, also do not make full use of new forms of energy simultaneously, cause the waste of regenerative resource.
For above policy and the state of the art; be necessary to propose a kind of counterflow-preventing protecting control method for micro-capacitance sensor; under the prerequisite of not excising distributed power source; by reasonably managing microgrid energy; the counterflow-preventing realizing micro-grid system controls; thus avoid impacting public electric wire net, maximum using renewable energy power generation simultaneously.
Summary of the invention
Technical problem to be solved by this invention overcomes deficiency of the prior art and provides a kind of counterflow-preventing protecting control method for micro-capacitance sensor reasonable in design; under the prerequisite of not excising distributed power source; by reasonably managing microgrid energy; the counterflow-preventing realizing micro-grid system controls; thus avoid impacting public electric wire net, maximum using renewable energy power generation simultaneously.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of counterflow-preventing protecting control method for micro-capacitance sensor, and described micro-capacitance sensor comprises distributed power source, energy-storage system, user load; Described distributed power source and energy-storage system are by respective energy converter incoming transport bus; User load is with the mode incoming transport bus of grouping; Ac bus accesses public electric wire net by points of common connection; Also be provided with counterflow-preventing in micro-capacitance sensor to control; It is characterized in that: described micro-capacitance sensor is also configured with extra load, this extra load be connected with ac bus by gate-controlled switch, and this extra load be connected with public electric wire net, the power of described extra load is greater than the rich power of micro-capacitance sensor;
Arranging distributed power source generate output is Ps, and micro-capacitance sensor user load capacity is Pl, and it is Pa that counterflow-preventing controls to start threshold value, and it is Pb that counterflow-preventing controls to close threshold value;
This counterflow-preventing protecting control method is further comprising the steps of:
(1) as Ps-Pl > Pa, go to step (2);
As Pl-Ps > Pb, go to step (3);
As-Pb≤Ps-Pl≤Pa, micro-capacitance sensor keeps standing state constant;
(2) energy-storage system current capacities is detected;
Energy-storage system current capacities does not reach its upper energy limit, goes to step (4);
Energy-storage system current capacities has reached its upper energy limit, goes to step (5);
(3) micro-capacitance sensor switches to grid-connect mode, supplements micro-grid load breach by public electric wire net and energy-storage system;
(4) micro-capacitance sensor switches to island mode, and energy-storage system charging absorbs unnecessary distributed power source generate output;
(5) micro-capacitance sensor switches to island mode, the gate-controlled switch on the circuit that closed extra load is connected with ac bus, to be dissolved the rich power that micro-capacitance sensor sends by extra load.
When distributed power source power output in micro-capacitance sensor is greater than user load and energy-storage system has reached upper energy limit, the rich power of micro-capacitance sensor is consumed by this extra load, thus does not need to excise distributed power source.
The circuit that extra load of the present invention is connected with public electric wire net is provided with inverse probability checkout gear; In step (5), micro-capacitance sensor switches to island mode, the gate-controlled switch that closed extra load is connected with ac bus, to be dissolved the rich power that micro-capacitance sensor sends by extra load, now, when inverse probability checkout gear detects inverse probability, when namely public electric wire net breaks down at this connection line place, gate-controlled switch on the circuit that disconnection extra load is connected with ac bus, and micro-capacitance sensor is switched to island mode.
The present invention arranges Pa=Pb=0.05 × Pl.
The circuit that extra load of the present invention is connected with ac bus is also provided with unidirectional electric energy metering device.The effect of unidirectional electric energy metering device is used to the remaining electric electricity volume of measuring micro-capacitance sensor, thus the policy can formulated according to country and standard provide the electricity charge to subsidize for micro-capacitance sensor user.
Extra load of the present invention comprises electric automobile charging station or public place lighting apparatus.During planning micro-capacitance sensor, the round-the-clock load that electric automobile charging station, public place lighting apparatus can be selected such is as the extra load of micro-capacitance sensor, so that the rich power of micro-capacitance sensor of can dissolving at any time and all.
Distributed power source of the present invention comprises wind generator system, photovoltaic generating system, biomass power generation system.
Compared with prior art, tool has the following advantages and effect in the present invention:
(1) for micro-grid connection problem, by carrying out counterflow-preventing protecting control to micro-capacitance sensor, eliminate the power supply characteristic of micro-capacitance sensor, thus the impact of micro-capacitance sensor on the public electric wire net quality of power supply, relaying protection, electricity consumption reliability, fail safe is reduced greatly.
(2) for the policy requirements of electricity online more than national requirements distributed generation system, improvement is made to existing counterflow-preventing control technology, by making the rich electricity of micro-capacitance sensor can be sold to electrical network under the prerequisite not producing adverse current to power distribution network to micro-capacitance sensor configuration extra load, do not need to excise distributed power source, further increase renewable energy utilization rate.
(3) the present invention have employed two judgment thresholds in control logic: counterflow-preventing controls to start threshold value Pa and counterflow-preventing control closedown threshold value Pb, arrange that two threshold values are current micro-capacitance sensor user load capacity 5 percent, thus ensureing to avoid micro-grid connection device in critical point frequent movement and energy-storage system repeated charge under the prerequisite that micro-capacitance sensor load normally works, extend the micro-grid system life-span.
Accompanying drawing explanation
Fig. 1 is the major loop schematic diagram of the embodiment of the present invention.
Fig. 2 is the control flow chart of counterflow-preventing protecting control method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the invention will be further described.
See Fig. 1 and Fig. 2, the micro-capacitance sensor of the embodiment of the present invention comprises distributed power source, energy-storage system BAT, user load LOAD1 ~ LOADn.Distributed power source comprises wind generator system PW, photovoltaic generating system PV, biomass power generation system PB etc.Energy-storage system BAT comprises lead accumulator, lithium battery, super capacitor etc.
Distributed power source and energy-storage system BAT access the ac bus of 400V by respective energy converter.User load LOAD1 ~ LOADn accesses the ac bus of 400V in the mode of grouping.Ac bus accesses public electric wire net by points of common connection PCC.
Extra load LOAD is connected with ac bus by gate-controlled switch K, and closed gate-controlled switch K, extra load LOAD and ac bus are connected, and disconnect gate-controlled switch K, extra load LOAD and ac bus disconnect.The circuit that extra load LOAD is connected with ac bus is provided with unidirectional electric energy metering device W.
Extra load LOAD is also connected with public electric wire net, and the circuit that extra load LOAD is connected with public electric wire net is provided with inverse probability checkout gear N.Jointly extra load LOAD is powered by micro-capacitance sensor and public electric wire net.
The power of extra load LOAD is greater than the rich power of micro-capacitance sensor, and the rich power that micro-capacitance sensor of dissolving at any time sends.
The points of common connection PCC place of micro-capacitance sensor and public electric wire net is provided with static switch, and the Main Function of static switch is when micro-capacitance sensor produces inverse probability and inverse probability disappears, and switches the operational mode (grid-connected/isolated island) of micro-capacitance sensor.In addition, when outside public electric wire net breaks down, micro-capacitance sensor can be made to exit public electric wire net rapidly, enter island mode and run.
During planning micro-capacitance sensor, the round-the-clock load such as electric automobile charging station, public place lighting apparatus can be selected as the extra load LOAD of micro-capacitance sensor, so that the rich power of micro-capacitance sensor of can dissolving at any time and all.
Arranging distributed power source generate output is Ps, and micro-capacitance sensor user load capacity is Pl, and it is Pa that counterflow-preventing controls to start threshold value, and it is Pb that counterflow-preventing controls to close threshold value; Ps is the total power generating capacity of the power supply such as wind generator system PW, photovoltaic generating system PV, biomass power generation system PB of access; Pl is the total capacity of the user load LOAD1 ~ LOADn of access.Pa and Pb, for adopt in control logic, arranges Pa=Pb=0.05 × Pl.
This counterflow-preventing protecting control method of the present invention is further comprising the steps of:
(1) detect after system initialization, as Ps-Pl > Pa, go to step (2);
As Pl-Ps > Pb, go to step (3);
As-Pb≤Ps-Pl≤Pa, micro-capacitance sensor keeps standing state constant, repeats to start step (1);
(2) energy-storage system BAT current capacities is detected;
Energy-storage system BAT current capacities does not reach its upper energy limit, goes to step (4);
Energy-storage system BAT current capacities has reached its upper energy limit, goes to step (5);
(3) micro-capacitance sensor switches to grid-connect mode, supplements micro-grid load breach by public electric wire net and energy-storage system BAT, and micro-capacitance sensor keeps existing grid-connect mode state constant, repeats to start step (1);
(4) micro-capacitance sensor switches to island mode, and energy-storage system BAT charges and absorbs unnecessary distributed power source generate output, and micro-capacitance sensor keeps existing island mode state constant, repeats to start step (1);
(5) micro-capacitance sensor switches to island mode, the gate-controlled switch K on the circuit that closed extra load LOAD is connected with ac bus, and extra load LOAD and ac bus are connected, and to be dissolved the rich power that micro-capacitance sensor sends by extra load LOAD; Now, when inverse probability checkout gear N detects inverse probability at this connection line place, namely when public electric wire net breaks down, gate-controlled switch K on the circuit that disconnection extra load LOAD is connected with ac bus, extra load LOAD and ac bus disconnect, and micro-capacitance sensor is switched to island mode, micro-capacitance sensor keeps existing island mode state constant, repeats to start step (1); When inverse probability checkout gear N does not detect inverse probability at this connection line place, when namely public electric wire net does not break down, repeat to start step (1).
Although the present invention with embodiment openly as above; but it is also not used to limit protection scope of the present invention; any technical staff being familiar with this technology, not departing from the change and retouching done in the spirit and scope of the present invention, all should belong to protection scope of the present invention.
Claims (4)
1., for a counterflow-preventing protecting control method for micro-capacitance sensor, described micro-capacitance sensor comprises distributed power source, energy-storage system, user load; Described distributed power source and energy-storage system are by respective energy converter incoming transport bus; User load is with the mode incoming transport bus of grouping; Ac bus accesses public electric wire net by points of common connection; Also be provided with counterflow-preventing in micro-capacitance sensor to control; It is characterized in that: described micro-capacitance sensor is also configured with extra load, this extra load be connected with ac bus by gate-controlled switch, and this extra load be connected with public electric wire net, the power of described extra load is greater than the rich power of micro-capacitance sensor;
Arranging distributed power source generate output is Ps, and micro-capacitance sensor user load capacity is Pl, and it is Pa that counterflow-preventing controls to start threshold value, and it is Pb that counterflow-preventing controls to close threshold value;
This counterflow-preventing protecting control method is further comprising the steps of:
(1) as Ps-Pl > Pa, go to step (2);
As Pl-Ps > Pb, go to step (3);
As-Pb≤Ps-Pl≤Pa, micro-capacitance sensor keeps standing state constant;
(2) energy-storage system current capacities is detected;
Energy-storage system current capacities does not reach its upper energy limit, goes to step (4);
Energy-storage system current capacities has reached its upper energy limit, goes to step (5);
(3) micro-capacitance sensor switches to grid-connect mode, supplements micro-grid load breach by public electric wire net and energy-storage system;
(4) micro-capacitance sensor switches to island mode, and energy-storage system charging absorbs unnecessary distributed power source generate output;
(5) micro-capacitance sensor switches to island mode, the gate-controlled switch on the circuit that closed extra load is connected with ac bus, to be dissolved the rich power that micro-capacitance sensor sends by extra load;
Pa=Pb=0.05 × Pl is set.
2. the counterflow-preventing protecting control method for micro-capacitance sensor according to claim 1, is characterized in that: the circuit that described extra load is connected with ac bus is also provided with unidirectional electric energy metering device.
3. the counterflow-preventing protecting control method for micro-capacitance sensor according to claim 1, is characterized in that: described extra load comprises electric automobile charging station or public place lighting apparatus.
4. the counterflow-preventing protecting control method for micro-capacitance sensor according to claim 1, is characterized in that: described distributed power source comprises wind generator system, photovoltaic generating system, biomass power generation system.
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| CN201310252615.9A CN103326400B (en) | 2013-06-24 | 2013-06-24 | Countercurrent-preventing protection and control method for microgrid |
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| CN104899790A (en) * | 2014-03-07 | 2015-09-09 | 国网上海市电力公司 | Energy management method in energy storage system in micro-grid |
| CN106301156A (en) * | 2016-08-28 | 2017-01-04 | 刘建林 | The dynamic energy storage method of solar panel and system |
| CN109802432A (en) * | 2019-01-04 | 2019-05-24 | 浙江联盛合众新能源有限公司 | A kind of anti-reverse flow control device of photovoltaic plant and its control method |
| CN117977588A (en) * | 2024-04-02 | 2024-05-03 | 杭州微慕科技有限公司 | Energy distribution method, control device and energy distribution equipment of micro-grid |
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| CN102664415A (en) * | 2012-04-27 | 2012-09-12 | 湖北省电力公司电力试验研究院 | Classified microgrid networking system based on terminal users |
| CN102664429B (en) * | 2012-05-29 | 2014-05-14 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
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