CN103023056A - Micro-grid control method and micro-grid control device - Google Patents

Micro-grid control method and micro-grid control device Download PDF

Info

Publication number
CN103023056A
CN103023056A CN2012105810010A CN201210581001A CN103023056A CN 103023056 A CN103023056 A CN 103023056A CN 2012105810010 A CN2012105810010 A CN 2012105810010A CN 201210581001 A CN201210581001 A CN 201210581001A CN 103023056 A CN103023056 A CN 103023056A
Authority
CN
China
Prior art keywords
power
value
output
power source
main power
Prior art date
Application number
CN2012105810010A
Other languages
Chinese (zh)
Other versions
CN103023056B (en
Inventor
周丹
李鹏
汪科
张雪松
赵波
葛晓慧
周金辉
Original Assignee
浙江省电力公司电力科学研究院
国家电网公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 浙江省电力公司电力科学研究院, 国家电网公司 filed Critical 浙江省电力公司电力科学研究院
Priority to CN201210581001.0A priority Critical patent/CN103023056B/en
Publication of CN103023056A publication Critical patent/CN103023056A/en
Application granted granted Critical
Publication of CN103023056B publication Critical patent/CN103023056B/en

Links

Abstract

The invention discloses a micro-grid control method. The micro-grid control method includes: monitoring output power of a master power supply; if the output power of the master power supply fluctuates, computing a frequency reference value and a voltage reference value of the master power supply according to a fluctuating value; controlling the master power supply to enable output frequency and output voltage thereof to be the frequency reference value and the voltage reference value respectively; monitoring the output frequency and the output voltage of the power supply; computing an output power reference value of slave power supplies according to monitored change values of output frequency and output voltage of the slave power supplies; and controlling the slave power supplies to enable output power thereof to be the power reference value. Besides, change of the output power of the slave power supplies and fluctuation of the output power of the master power supply are in the same direction. Clearly, the micro-grid control method has the advantages that by means of finally controlling the output power of the slave power supplies, energy-storing inverters share power fluctuation when a micro-grid is in power fluctuation, so that reliability of the micro-grid is improved, capacity allocation requirements of the master power supply are lowered, and investment cost is reduced.

Description

A kind of little power grid control method and apparatus
Technical field
The invention belongs to little power grid control technical field, relate in particular to a kind of little power grid control method and apparatus.
Background technology
Little electrical network has huge social and economic effects, is the effective means of performance distributed electrical source efficiency.Little electrical network operation control characteristic itself requires it to adopt distributed energy storage, and energy storage is as the core link in little electrical network, in little power grid operation, energy-optimised management, power in short-term, improve the aspect such as the quality of power supply and play vital effect.
At present, the energy-storage system of little electrical network adopts energy type energy storage and power-type energy storage to mix the mode of using, because separate unit energy storage inverter power is limited, the occasion of larger stored energy capacitance is selected the structure of many energy storage inverter parallels usually, based on above reason, comprising many energy storage inverters in little electrical network is a kind of very common situations.The existing operational mode that contains the micro-grid system of many energy storage inverter is: the energy type energy storage inverter that capacity relative is larger or electric rotating machine run on as main power source decides voltage/frequency (VF) mode, and other energy storage inverters are decided power (PQ) mode as running on from power supply.
But under above-mentioned operational mode, when the transient power fluctuation appearred in little electrical network, this transient power fluctuation was born by the energy storage inverter as main power source, thereby had reduced the power supply reliability of little electrical network, and then the capacity configuration requirement that has increased main power source, increased cost of investment.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of little power grid control method, to address the above problem, make each energy storage inverter in little electrical network can both share the transient power fluctuation of appearance, strengthen little electrical network to the admittance ability of transient power fluctuation, and then improve the power supply reliability of little electrical network.
For this reason, the invention provides following technical scheme:
A kind of little power grid control method comprises:
Power output to main power source is carried out Real-Time Monitoring;
If the power output that the monitoring result of described Real-Time Monitoring is fluctuates, then according to the undulating value of described power output, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source is reverse;
Described main power source is controlled, made the output frequency of described main power source and the value of output voltage be respectively described frequency reference value and voltage reference value;
Output frequency and output voltage from power supply are carried out Real-Time Monitoring;
According to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source in the same way;
Control from power supply described, making the value of described power output from power supply is described value and power reference.
Preferably, described power output comprises active power and reactive power.
Preferably, described the first preset algorithm comprises main power source output frequency control algolithm and main power source output voltage control algorithm.
Preferably, if being the power output of main power source, the monitoring result of described Real-Time Monitoring fluctuates, then according to the undulating value of the power output of described main power source, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source oppositely specifically comprises:
If being the active power of main power source, the monitoring result of described Real-Time Monitoring increases, then according to the increase value of the active power of described main power source, based on the frequency reference value of main power source output frequency control algolithm calculating main power source, described frequency reference value is less than the current output frequency of main power source;
If being the active power of main power source, the monitoring result of described Real-Time Monitoring reduces, then according to the value that reduces of the active power of described main power source, based on the frequency reference value of main power source output frequency control algolithm calculating main power source, described frequency reference value is greater than the current output frequency of main power source;
If being the reactive power of main power source, the monitoring result of described Real-Time Monitoring increases, then according to the increase value of the reactive power of described main power source, based on the voltage reference value of main power source output voltage control algorithm calculating main power source, described voltage reference value is less than the current output voltage of main power source;
If being the reactive power of main power source, the monitoring result of described Real-Time Monitoring reduces, then according to the value that reduces of the reactive power of described main power source, based on the voltage reference value of main power source output voltage control algorithm calculating main power source, described voltage reference value is greater than the current output voltage of main power source.
Preferably, described the second preset algorithm comprises from power supply active power control algolithm with from power supply Reactive Power Control algorithm.
Preferably, described according to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source specifically comprises in the same way:
The changing value from the output frequency of power supply according to described Real-Time Monitoring, based on the active power reference value of calculating from power supply active power control algolithm from power supply, the fluctuation of the variation that described active power reference value occurs based on the current active power from power supply and the active power of described main power source in the same way;
The changing value from the output voltage of power supply according to described Real-Time Monitoring, based on the reactive power reference qref of calculating from power supply Reactive Power Control algorithm from power supply, the fluctuation of the variation that described reactive power reference qref occurs based on the current reactive power from power supply and the reactive power of described main power source in the same way.
Preferably, describedly control from power supply described, making the value of described power output from power supply is that described value and power reference specifically comprises:
Control from power supply described, making the value of described active power from power supply is described active power reference value;
Control from power supply described, making the value of described reactive power from power supply is described reactive power reference qref.
A kind of little power grid control device comprises main power source monitoring modular, main power source computing module, main power source control module, from the power supply monitoring module, from the power supply computing module with from energy supply control module, wherein:
Described monitoring modular is used for the power output of main power source is carried out Real-Time Monitoring;
Described main power source computing module, be used for when the monitoring result of described Real-Time Monitoring is the power output generation fluctuation of main power source, undulating value according to the power output of described main power source, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source is reverse;
Described main power source control module is used for described main power source is controlled, and makes the output frequency of described main power source and the value of output voltage be respectively described frequency reference value and voltage reference value;
Described from the power supply monitoring module, be used for output frequency and output voltage from power supply are carried out Real-Time Monitoring;
Described from the power supply computing module, be used for according to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source in the same way;
Described from energy supply control module, be used for controlling from power supply described, making the value of described power output from power supply is described value and power reference.
Little power grid control method that the embodiment of the invention provides, the undulating value of the power fluctuation by the foundation main power source, calculate, control output frequency and the output voltage of main power source, then foundation is from the variation of output frequency and the output voltage of power supply, calculate, control the power output from power supply, the final power output that changes from power supply, and the power fluctuation that makes the variation of its generation and main power source is shared the purpose of the transient power fluctuation of appearance when always being implemented in little electrical network generation transient power fluctuation as each energy storage inverter of master and slave power supply.Particularly, when little electrical network emergent power fluctuation, main power source is slightly faster than the response speed from power supply, the power output of main power source fluctuates, method of the present invention calculates output frequency reference value and the output voltage reference value of main power source based on the first preset algorithm according to the undulating value of main power source power output, and be handed down to main power source by instruction mode, after the main power source response, its power output and output voltage change, and should change with the power fluctuation of main power source reverse, corresponding variation occurs in the busbar voltage of little electrical network and frequency immediately, and the voltage from power supply in parallel with main power source, respective change also occurs in frequency, at this moment, method foundation of the present invention is from the output frequency of power supply and the changing value of output voltage, based on the power output reference value of the second preset algorithm calculating from power supply, and control is described power output reference value from the power output of power supply, thereby, changed the power output from power supply, and from the power fluctuation of the variation of output power of power supply and main power source in the same way, finally can make each energy storage inverter share power fluctuation among the present invention.
To sum up, little power grid control method of the present invention is by the power output of final control from power supply, realized when the transient power fluctuation appears in little electrical network, the purpose of sharing power fluctuation as each energy storage inverter of master and slave power supply, thereby improved the micro-grid system reliability of operation, suitably reduce the capacity configuration requirement of main power source, and then reduced cost of investment.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation from the little electrical network of net type that contains many energy storage inverter that the embodiment of the invention provides;
Fig. 2 is little power grid control method flow diagram that the embodiment of the invention provides;
Fig. 3 is the example function curve diagram of the main power source output frequency control algolithm that provides of the embodiment of the invention;
Fig. 4 is the example function curve diagram of the main power source output voltage control algorithm that provides of the embodiment of the invention;
Fig. 5 is an application example flow chart of little power grid control method of providing of the embodiment of the invention;
Fig. 6 is the Another Application example flow chart of little power grid control method of providing of the embodiment of the invention;
Fig. 7 is the structural representation of little power grid control device of providing of the embodiment of the invention;
Fig. 8 is little power grid control device of providing of the embodiment of the invention and the connection diagram of little electrical network.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention discloses a kind of little power grid control method and apparatus, this little power grid control method and apparatus is applicable to the little electrical network that contains many energy storage inverter is controlled, be particularly useful for containing controlling from the little electrical network of net type of many energy storage inverter, for making the user can more thoroughly, in depth understand the present invention, below at first little electrical network that the present invention was suitable for is introduced.
See also Fig. 1, it shows the typical structure from the little electrical network of net type that contains many energy storage inverter that the present invention is suitable for.Such as figure, this little electrical network comprises that main power source 100, first is from power supply 200, second from power supply 300, ac bus 400, high speed communication network 500, Blast Furnace Top Gas Recovery Turbine Unit (TRT) 600, load 700 and microgrid controller 800.
Wherein, main power source 100 is the Power Support from the little electrical network of net type, voltage for the ac bus 400 of setting up little electrical network, main power source 100 comprises the first energy-storage battery 101 and the first two-way inverter 102, the first energy-storage battery 101 is specially the energy type energy-storage battery, and its output links to each other with the input of the first two-way inverter 102; The output of the first two-way inverter 102 works in decides the voltage/frequency pattern, i.e. VF pattern, and its output is connected to ac bus 400.First comprises that from power supply 200 the second energy-storage battery 201 and the second two-way inverter 202, the second energy-storage batteries 201 can be the energy type energy-storage batteries, also can be the power-type energy-storage battery, and 202 input of its output and the second two-way inverter links to each other; The second two-way inverter 202 works in decides power mode, i.e. PQ pattern, and its output links to each other with ac bus 400.Second comprises that from power supply 300 the 3rd energy-storage battery 301 and the 3rd two-way inverter 302, the three energy-storage batteries 301 can be the energy type energy-storage batteries, also can be the power-type energy-storage battery, and its output links to each other with the input of the 3rd two-way inverter 302; The 3rd two-way inverter 302 works in decides power mode, and its output links to each other with ac bus 400.The first two-way inverter 102 of main power source 100, from the second two-way inverter 202 of power supply 200 and from the 3rd two-way inverter 302 of power supply 300 a built-in controller respectively, be designated as the main power source controller and from power-supply controller of electric.
Blast Furnace Top Gas Recovery Turbine Unit (TRT) 600, for being the device of electric energy with other forms of energy conversion in the little electrical network of net type, it is generally wind-driven generator, photovoltaic generator, small rotary generator distributed Blast Furnace Top Gas Recovery Turbine Unit (TRT) in little electrical network.Load 700 is various power consumption equipments in the little electrical network of net type, and it directly is connected on the ac bus 400.High speed communication network 500 is used for main power source 100, from power supply 200 and from the transmission of voltage, electric current, power measurements and control command between power supply 300 and the microgrid controller 800.Microgrid controller 800 by the access that high speed communication network 500 is realized inner all the distributed energy storage inverters of little electrical network, is finished the control function of many energy storage inverter, guarantees to be the electric network coordination reliability service.
Below will based on above-mentioned little electrical network, by a plurality of embodiment method and apparatus of the present invention be described in detail.
Embodiment one
The embodiment of the invention one discloses a kind of little power grid control method, sees also Fig. 2, and described little power grid control method comprises the steps:
S1: the power output to main power source is carried out Real-Time Monitoring.
Wherein, power output comprises active power and reactive power.
Take above-mentioned little electrical network as example, power output to main power source is carried out Real-Time Monitoring, specifically can be by adopting corresponding Acquisition Circuit or collector, and this Acquisition Circuit or collector linked to each other with main power source controller in the two-way inverter that is built in main power source by the high speed communication network, from active power and the reactive power of main power source controller Real-time Collection main power source; And on the basis that gathers, judge whether the active power of main power source and reactive power fluctuation has occured.
S2: fluctuate if the monitoring result of described Real-Time Monitoring is the power output of main power source, then according to the undulating value of the power output of described main power source, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source is reverse.
Wherein, the first preset algorithm comprises main power source output frequency control algolithm and main power source output voltage control algorithm.
When fluctuation has occured for the power output of main power source, namely work as little electrical network and the transient power fluctuation occurred, when main power source is temporarily born the power fluctuation of little electrical network, this step S2 is based on the purpose that reduces the power fluctuation that main power source bears, namely based on the purpose of sharing power fluctuation as the energy storage inverter of master and slave power supply, output frequency, output voltage to main power source are controlled, and particularly, step S2 comprises:
If being the active power of main power source, the monitoring result of Real-Time Monitoring increases, then according to the increase value of the active power of main power source, based on the frequency reference value of main power source output frequency control algolithm calculating main power source, this frequency reference value is less than the current output frequency of main power source;
If being the active power of main power source, the monitoring result of Real-Time Monitoring reduces, then according to the value that reduces of the active power of main power source, based on the frequency reference value of main power source output frequency control algolithm calculating main power source, this frequency reference value is greater than the current output frequency of main power source;
If being the reactive power of main power source, the monitoring result of Real-Time Monitoring increases, then according to the increase value of the reactive power of main power source, based on the voltage reference value of main power source output voltage control algorithm calculating main power source, this voltage reference value is less than the current output voltage of main power source;
If being the reactive power of main power source, the monitoring result of Real-Time Monitoring reduces, then according to the value that reduces of the reactive power of main power source, based on the voltage reference value of main power source output voltage control algorithm calculating main power source, this voltage reference value is greater than the current output voltage of main power source.
Particularly, the technical staff can according to requirement of engineering or system's needs of reality, set frequency reference value and voltage reference value that suitable algorithm calculates main power source.Present embodiment is given an example to the main power source output frequency control algolithm and the main power source output voltage control algorithm that adopt respectively, see also Fig. 3 and Fig. 4, Fig. 3 shows the relation curve between main power source frequency reference value and the fluctuation of main power source active power, and the mathematic(al) representation of the main power source output frequency control algolithm that this relation curve is corresponding is:
f=f 0-mΔP,???????????????????????(1)
Wherein, in the formula (1), f represents the frequency reference value of main power source, f 0The current output frequency of expression main power source, m is meritorious frequency droop coefficient, Δ P is main power source active power undulating value.
Correspondingly, Fig. 4 shows the relation curve between main power voltage reference value and the main power source reactive power fluctuation, and the mathematic(al) representation of the main power source output voltage control algorithm that this relation curve is corresponding is:
U=U 0-nΔQ,???????????????????????????(2)
In the formula (2), U represents the voltage reference value of main power source, U 0The current output voltage of expression main power source, n is the sagging coefficient of reactive voltage, Δ Q is main power source reactive power fluctuation value.
S3: described main power source is controlled, made the output frequency of described main power source and the value of output voltage be respectively described frequency reference value and voltage reference value.
Particularly, can main power source frequency reference value and the voltage reference value that calculate be handed down to main power source by the mode of instruction, and control main power source respond this instruction, make the output frequency of main power source and the value of output voltage become respectively frequency reference value and voltage reference value.
S4: output frequency and output voltage from power supply are carried out Real-Time Monitoring.
With among the step S1 main power source power output to be carried out the mode of Real-Time Monitoring similar, among this step S4 specifically with corresponding Acquisition Circuit or collector by high speed communication network 500 be built in linking to each other from power-supply controller of electric from the two-way inverter of power supply, from the output frequency from the power-supply controller of electric Real-time Collection from power supply and output voltage; And on the basis that gathers, calculate from the output frequency of power supply and the changing value of output voltage.
S5: according to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source in the same way.
When emergent power in little electrical network fluctuates, main power source is than slightly fast from the power supply response speed, the power output of main power source changes, it is the power fluctuation that main power source has temporarily been born little electrical network, the present invention is based on the purpose that reduces the power fluctuation that main power source bears, at first output frequency, the output voltage by step S1, S2 and S3 control main power source changes, and makes the power fluctuation of this variation and main power source reverse.After the main power source response, corresponding variation will occur in bus frequency, the voltage of little electrical network, and with the output frequency from power supply energy storage inverter, voltage as the energy storage inverter parallel of main power source same variation can occur also, step S5 of the present invention is equally based on the purpose that reduces the power fluctuation that main power source bears, calculating is from the power output reference value of power supply, is intended to change from the power output of power supply according to the power output reference value that calculates realize the purpose that power fluctuation is shared.
Wherein, the second preset algorithm comprises from power supply active power control algolithm with from power supply Reactive Power Control algorithm.
Particularly, step S5 comprises:
The changing value from the output frequency of power supply according to Real-Time Monitoring, based on the active power reference value of calculating from power supply active power control algolithm from power supply, the fluctuation of the variation that this active power reference value occurs based on the current active power from power supply and the active power of described main power source in the same way;
The changing value from the output voltage of power supply according to Real-Time Monitoring, based on the reactive power reference qref of calculating from power supply Reactive Power Control algorithm from power supply, the fluctuation of the variation that this reactive power reference qref occurs based on the current reactive power from power supply and the reactive power of main power source in the same way.
Equally, in this step, the technical staff can determine from the share amplitude of power supply to power fluctuation according to the requirement of engineering of reality, and sets on this basis and suitable calculate active power reference value and reactive power reference qref from power supply from power supply active power control algolithm with from power supply Reactive Power Control algorithm.No longer the algorithm that adopts is given an example in detail herein.
S6: control from power supply described, making the value of described power output from power supply is described value and power reference.
Correspondingly, mode that can be by instruction is with being handed down to from power supply from power supply active power reference value and reactive power reference qref of calculating, and control respond this instruction from power supply, make from the active power of power supply and the value of reactive power to become respectively active power reference value and reactive power reference qref.
In little electrical network emergent power fluctuation, main power source has temporarily been born this power fluctuation constantly, realize that by step S1, S2, S3 output frequency, the output voltage of main power source change, and then on this basis, respective change also occurs from output frequency, the output voltage of power supply, and step S4, S5, S6 be based on from the output frequency of power supply, the variation that output voltage occurs, and control is from the power output of power supply, realizes that finally master and slave power supply shares the purpose of power fluctuation.
In little electrical network actual motion, the power fluctuation that main power source occurs may be independent active power fluctuation or reactive power fluctuation, also may both exist simultaneously, in these several situations, all can adopt control method of the present invention that little electrical network is controlled, during implementation, for different fluctuation situations, the relevant parameter that utilizes method of the present invention to calculate, control master and slave power supply with reference to above explanation gets final product.
Below be respectively meritorious power fluctuation to occur separately and the application example of little power grid control method of the present invention occurs separately in the situation of reactive power fluctuation.
See also Fig. 5, when Fig. 5 showed the active power fluctuation, the application example flow process of little power grid control method of the present invention specifically comprised:
S51: main power source active power of output monitoring.
S52: the active power of judging main power source is increase or reduces, if judged result is increase, then execution in step S54; If judged result is for reducing, execution in step S53 then;
S53: the output frequency that increases main power source.
S54: the output frequency that reduces main power source.
Wherein, the concrete output frequency control algolithm that the main power source output frequency increases or the concrete amplitude that reduces can be set according to the technical staff among step S53, the S54 and deciding.
S55: monitor from the power grid dot frequency.
Monitor monitoring the output frequency that is in fact from power supply from the power grid dot frequency.
S56: judge from the output frequency of power supply to be increase or to reduce, if judged result is increase, then execution in step S58; If judged result is for reducing execution in step S57.
S57: increase from the active power of power supply output.
S58: reduce from the active power of power supply output.
Specifically decided by the active power control algolithm that the technical staff sets from the increase of power supply active power of output or the amplitude that reduces among step S57, the S58.
When Fig. 6 showed reactive power fluctuation, the application example flow process of little power grid control method of the present invention specifically comprised the steps:
S61: main power source output reactive power monitoring.
S62: the reactive power of judging main power source is increase or reduces, if judged result is increase, then execution in step S64; If judged result is for reducing, execution in step S63 then;
S63: the output voltage that increases main power source.
S64: the output voltage that reduces main power source.
S65: monitor from the power grid point voltage.
S66: judge from the output voltage of power supply to be increase or to reduce, if judged result is increase, then execution in step S68; If judged result is for reducing execution in step S67.
S67: increase from the reactive power of power supply output.
S68: reduce from the reactive power of power supply output.
Little power grid control method that the embodiment of the invention provides, the undulating value of the power fluctuation by the foundation main power source, calculate, control output frequency and the output voltage of main power source, then foundation is from the variation of output frequency and the output voltage of power supply, calculate, control the power output from power supply, the final power output that changes from power supply, and the power fluctuation that makes the variation of its generation and main power source is shared the purpose of the transient power fluctuation of appearance when always being implemented in little electrical network generation transient power fluctuation as each energy storage inverter of master and slave power supply.Particularly, when little electrical network emergent power fluctuation, main power source is slightly faster than the response speed from power supply, the power output of main power source fluctuates, method of the present invention calculates output frequency reference value and the output voltage reference value of main power source based on the first preset algorithm according to the undulating value of main power source power output, and be handed down to main power source by instruction mode, after the main power source response, its power output and output voltage change, and should change with the power fluctuation of main power source reverse, corresponding variation occurs in the busbar voltage of little electrical network and frequency immediately, and the voltage from power supply in parallel with main power source, respective change also occurs in frequency, at this moment, method foundation of the present invention is from the output frequency of power supply and the changing value of output voltage, based on the power output reference value of the second preset algorithm calculating from power supply, and control is described power output reference value from the power output of power supply, thereby, changed the power output from power supply, and from the power fluctuation of the variation of output power of power supply and main power source in the same way, finally can make each energy storage inverter share power fluctuation among the present invention.
To sum up, little power grid control method of the present invention is by the power output of final control from power supply, realized when the transient power fluctuation appears in little electrical network, the purpose of sharing power fluctuation as each energy storage inverter of master and slave power supply, thereby improved the micro-grid system reliability of operation, suitably reduce the capacity configuration requirement of main power source, and then reduced cost of investment.
Embodiment two
The embodiment of the invention two is on the basis of little power grid control method that embodiment one provides, a kind of little power grid control device is disclosed, see also Fig. 7, this little power grid control device comprises main power source monitoring modular 701, main power source computing module 702, main power source control module 703, from power supply monitoring module 704, from power supply computing module 705 with from energy supply control module 706, wherein:
Main power source monitoring modular 701 is used for the power output of main power source is carried out Real-Time Monitoring.
Main power source computing module 702, be used for when the monitoring result of Real-Time Monitoring is the power output generation fluctuation of main power source, undulating value according to the power output of main power source, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that this frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source is reverse.
Main power source control module 703 is used for main power source is controlled, and makes the output frequency of main power source and the value of output voltage be respectively frequency reference value and voltage reference value.
From power supply monitoring module 704, be used for output frequency and output voltage from power supply are carried out Real-Time Monitoring.
From power supply computing module 705, be used for according to Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that this power output reference value occurs based on the present output power from power supply and the power output of main power source in the same way.
From energy supply control module 706, be used for controlling from power supply, making from the value of the power output of power supply is value and power reference.
Little power grid control device of the present invention adopts high performance Programmable Logic Controller, as shown in Figure 8, its specifically by the high speed communication network be built in as the controller in the energy storage inverter of master and slave power supply: the main power source controller with link to each other from power-supply controller of electric, and then by the control that realizes little electrical network that issues to the collection of the signals such as the voltage of energy storage inverter, frequency, active power, reactive power and control command.Particularly, the main power source monitoring modular 701 in little power grid control device links to each other with the main power source controller with main power source control module 703, realizes respectively the collection of main power source coherent signal and issuing of control command; From power supply monitoring module 704 with from energy supply control module 706 with link to each other from power supply control, realize respectively from the collection of power supply coherent signal and issuing of control command.
When application the present invention controls little electrical network, can set according to actual needs the communication cycle between little power grid control device and the little electrical network, in each communication cycle, the relevant parameter of energy storage inverter in the little electrical network of little power grid control device monitoring, and issue corresponding control command to it, thereby at little electrical network the transient power fluctuation appears, when temporarily having born this power fluctuation as the energy storage inverter of little electrical network main power source, in the residing communication cycle, the little power grid control device of the present invention can be by main to conduct when this power fluctuation occurs, issue new control command realization to the control of little electrical network from the energy storage inverter of power supply.
Need to prove, be not difficult to draw, namely be that both are essentially identical concept to collection, calculating and control as the above-mentioned various signals of the energy storage inverter of master and slave power supply to collection, calculating and the control essence of the signals such as the voltage of master and slave power supply, frequency, active power, reactive power in the specification of the present invention.
As seen, the present invention be applicable to by a plurality of energy storage inverters form and run on principal and subordinate's control model from net type micro-grid system, being micro-grid system supports voltage and the frequency of little electrical network take certain rotary generator or certain energy storage inverter as the networking unit, other energy storage inverter is to decide the power mode operation.Can effectively realize many energy storage inverter parallel, strengthen system transient modelling fluctuation admittance ability, control structure is simple, and system's circulation is controlled.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the disclosed method of embodiment, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.
At last, also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby not only comprise those key elements so that comprise process, method, article or the equipment of a series of key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.Do not having in the situation of more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the application and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that the application's technical scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, such as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the application or embodiment.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (8)

1. a little power grid control method is characterized in that, comprising:
Power output to main power source is carried out Real-Time Monitoring;
If being the power output of main power source, the monitoring result of described Real-Time Monitoring fluctuates, then according to the undulating value of described power output, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source is reverse;
Described main power source is controlled, made the output frequency of described main power source and the value of output voltage be respectively described frequency reference value and voltage reference value;
Output frequency and output voltage from power supply are carried out Real-Time Monitoring;
According to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source in the same way;
Control from power supply described, making the value of described power output from power supply is described value and power reference.
2. little power grid control method according to claim 1 is characterized in that described power output comprises active power and reactive power.
3. little power grid control method according to claim 2 is characterized in that, described the first preset algorithm comprises main power source output frequency control algolithm and main power source output voltage control algorithm.
4. little power grid control method according to claim 3, it is characterized in that, if being the power output of main power source, the monitoring result of described Real-Time Monitoring fluctuates, then according to the undulating value of the power output of described main power source, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source oppositely specifically comprises:
If being the active power of main power source, the monitoring result of described Real-Time Monitoring increases, then according to the increase value of the active power of described main power source, based on the frequency reference value of main power source output frequency control algolithm calculating main power source, described frequency reference value is less than the current output frequency of main power source;
If being the active power of main power source, the monitoring result of described Real-Time Monitoring reduces, then according to the value that reduces of the active power of described main power source, based on the frequency reference value of main power source output frequency control algolithm calculating main power source, described frequency reference value is greater than the current output frequency of main power source;
If being the reactive power of main power source, the monitoring result of described Real-Time Monitoring increases, then according to the increase value of the reactive power of described main power source, based on the voltage reference value of main power source output voltage control algorithm calculating main power source, described voltage reference value is less than the current output voltage of main power source;
If being the reactive power of main power source, the monitoring result of described Real-Time Monitoring reduces, then according to the value that reduces of the reactive power of described main power source, based on the voltage reference value of main power source output voltage control algorithm calculating main power source, described voltage reference value is greater than the current output voltage of main power source.
5. little power grid control method according to claim 2 is characterized in that, described the second preset algorithm comprises from power supply active power control algolithm with from power supply Reactive Power Control algorithm.
6. little power grid control method according to claim 5, it is characterized in that, described according to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source specifically comprises in the same way:
The changing value from the output frequency of power supply according to described Real-Time Monitoring, based on the active power reference value of calculating from power supply active power control algolithm from power supply, the fluctuation of the variation that described active power reference value occurs based on the current active power from power supply and the active power of described main power source in the same way;
The changing value from the output voltage of power supply according to described Real-Time Monitoring, based on the reactive power reference qref of calculating from power supply Reactive Power Control algorithm from power supply, the fluctuation of the variation that described reactive power reference qref occurs based on the current reactive power from power supply and the reactive power of described main power source in the same way.
7. little power grid control method according to claim 6 is characterized in that, describedly controls from power supply described, and making the value of described power output from power supply is that described value and power reference specifically comprises:
Control from power supply described, making the value of described active power from power supply is described active power reference value;
Control from power supply described, making the value of described reactive power from power supply is described reactive power reference qref.
8. a little power grid control device is characterized in that, comprises main power source monitoring modular, main power source computing module, main power source control module, from the power supply monitoring module, from the power supply computing module with from energy supply control module, wherein:
Described monitoring modular is used for the power output of main power source is carried out Real-Time Monitoring;
Described main power source computing module, be used for when the monitoring result of described Real-Time Monitoring is the power output generation fluctuation of main power source, undulating value according to the power output of described main power source, calculate frequency reference value and the voltage reference value of main power source based on the first preset algorithm, the fluctuation of the variation that described frequency reference value and voltage reference value occur based on current output frequency and the output voltage of main power source respectively and the power output of main power source is reverse;
Described main power source control module is used for described main power source is controlled, and makes the output frequency of described main power source and the value of output voltage be respectively described frequency reference value and voltage reference value;
Described from the power supply monitoring module, be used for output frequency and output voltage from power supply are carried out Real-Time Monitoring;
Described from the power supply computing module, be used for according to described Real-Time Monitoring from the output frequency of power supply and the changing value of output voltage, calculate power output reference value from power supply based on the second preset algorithm, the fluctuation of the variation that described power output reference value occurs based on the present output power from power supply and the power output of described main power source in the same way;
Described from energy supply control module, be used for controlling from power supply described, making the value of described power output from power supply is described value and power reference.
CN201210581001.0A 2012-12-26 2012-12-26 A kind of grid control method and device CN103023056B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210581001.0A CN103023056B (en) 2012-12-26 2012-12-26 A kind of grid control method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210581001.0A CN103023056B (en) 2012-12-26 2012-12-26 A kind of grid control method and device

Publications (2)

Publication Number Publication Date
CN103023056A true CN103023056A (en) 2013-04-03
CN103023056B CN103023056B (en) 2016-03-30

Family

ID=47971321

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210581001.0A CN103023056B (en) 2012-12-26 2012-12-26 A kind of grid control method and device

Country Status (1)

Country Link
CN (1) CN103023056B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103345227A (en) * 2013-07-02 2013-10-09 东南大学 Micro grid monitoring and energy management device and method
CN104079008A (en) * 2014-06-25 2014-10-01 深圳市汇川技术股份有限公司 Power supply method and system based on microgrid
CN104218618A (en) * 2014-10-09 2014-12-17 南京磐能电力科技股份有限公司 Adjustment control method for microgrid stable running adopting master-slave control mode
CN104518520A (en) * 2013-09-30 2015-04-15 西门子公司 Control method and device of renewable energy driven generating unit
CN104578180A (en) * 2014-12-31 2015-04-29 浙江大学 Full-distributed self-optimal-tracing constant power control method for isolated island operation of micro grid
CN107346896A (en) * 2017-06-10 2017-11-14 北京科诺伟业科技股份有限公司 A kind of light stores up micro-grid system energy accumulation current converter host-slave parallel control method
CN108551174A (en) * 2018-04-20 2018-09-18 南京南瑞继保电气有限公司 A kind of broad sense droop control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101931238A (en) * 2010-04-29 2010-12-29 浙江省电力试验研究院 Master-slave strategy-based microgrid system coordination control method
CN102570489A (en) * 2012-02-29 2012-07-11 中国南方电网有限责任公司调峰调频发电公司 Dynamic power coordination control method for battery energy storage system
CN102709928A (en) * 2012-05-14 2012-10-03 南方电网科学研究院有限责任公司 Urgent frequency modulation (FM) control method of energy storage system in micro-grid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101931238A (en) * 2010-04-29 2010-12-29 浙江省电力试验研究院 Master-slave strategy-based microgrid system coordination control method
CN102570489A (en) * 2012-02-29 2012-07-11 中国南方电网有限责任公司调峰调频发电公司 Dynamic power coordination control method for battery energy storage system
CN102709928A (en) * 2012-05-14 2012-10-03 南方电网科学研究院有限责任公司 Urgent frequency modulation (FM) control method of energy storage system in micro-grid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王鹤 等: "含多种分布式电源的微电网控制策略", 《电力自动化设备》 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103345227A (en) * 2013-07-02 2013-10-09 东南大学 Micro grid monitoring and energy management device and method
CN103345227B (en) * 2013-07-02 2015-09-09 东南大学 A kind of micro-capacitance sensor monitoring and energy management apparatus and method
CN104518520A (en) * 2013-09-30 2015-04-15 西门子公司 Control method and device of renewable energy driven generating unit
CN104079008A (en) * 2014-06-25 2014-10-01 深圳市汇川技术股份有限公司 Power supply method and system based on microgrid
CN104079008B (en) * 2014-06-25 2016-08-24 深圳市汇川技术股份有限公司 A kind of method of supplying power to based on micro-capacitance sensor and electric power system
CN104218618B (en) * 2014-10-09 2016-04-13 南京磐能电力科技股份有限公司 A kind of adjustment control method of micro-capacitance sensor stable operation of master-slave control mode
CN104218618A (en) * 2014-10-09 2014-12-17 南京磐能电力科技股份有限公司 Adjustment control method for microgrid stable running adopting master-slave control mode
CN104578180A (en) * 2014-12-31 2015-04-29 浙江大学 Full-distributed self-optimal-tracing constant power control method for isolated island operation of micro grid
CN104578180B (en) * 2014-12-31 2016-08-24 浙江大学 It is full distributed from becoming excellent Poewr control method that a kind of piconet island runs
CN107346896A (en) * 2017-06-10 2017-11-14 北京科诺伟业科技股份有限公司 A kind of light stores up micro-grid system energy accumulation current converter host-slave parallel control method
CN108551174A (en) * 2018-04-20 2018-09-18 南京南瑞继保电气有限公司 A kind of broad sense droop control method

Also Published As

Publication number Publication date
CN103023056B (en) 2016-03-30

Similar Documents

Publication Publication Date Title
Unamuno et al. Hybrid ac/dc microgrids—Part II: Review and classification of control strategies
Hossain et al. Robust control for power sharing in microgrids with low-inertia wind and PV generators
Kumar et al. A review on overall control of DC microgrids
Meng et al. Distributed load sharing of an inverter-based microgrid with reduced communication
Al-Saedi et al. Voltage and frequency regulation based DG unit in an autonomous microgrid operation using Particle Swarm Optimization
CN101969281B (en) Coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on co-direct current bus
CN102931653B (en) Comprehensive coordination control method of wind-solar direct current micro-grid
Lu et al. Application of Petri nets for the energy management of a photovoltaic based power station including storage units
CN103490420B (en) A kind of micro-grid connection control method based on auto-disturbance rejection technology
ES2545606T3 (en) Procedure and system for operating a wind power plant comprising a number of wind turbine generators
Tan et al. A review of technical challenges in planning and operation of remote area power supply systems
CN106030450B (en) Control micro-capacitance sensor
Zhang et al. Fully distributed coordination of multiple DFIGs in a microgrid for load sharing
CN105514966B (en) A kind of direct-current grid group energy storage optimization and control method for coordinating
Zhou et al. Energy management and power control of a hybrid active wind generator for distributed power generation and grid integration
CN102510089B (en) Wind and solar micro power grid system
Wang et al. Optimal expansion planning of isolated microgrid with renewable energy resources and controllable loads
Shah et al. Damping performance analysis of battery energy storage system, ultracapacitor and shunt capacitor with large-scale photovoltaic plants
CN107069811B (en) Impedance network modeling and method for analyzing stability based on synchronous reference coordinate system
Tang et al. Sliding mode robust control based active-power modulation of multi-terminal HVDC transmissions
JP2013544063A (en) Method and system for facilitating control planning of an electronic power system interface of a distributed power supply
Cai et al. A hierarchical multi-agent control scheme for a black start-capable microgrid
CN104330980A (en) RT-LAB based microgrid simulation testing system
CN104281977A (en) Hybrid microgrid application platform and control method theref
CN104659804B (en) Micro-capacitance sensor containing hybrid energy-storing and its control method

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model