CN103855724A - Micro power grid system - Google Patents
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- CN103855724A CN103855724A CN201410126121.0A CN201410126121A CN103855724A CN 103855724 A CN103855724 A CN 103855724A CN 201410126121 A CN201410126121 A CN 201410126121A CN 103855724 A CN103855724 A CN 103855724A
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Abstract
The invention provides a micro power grid system which comprises a direct current bus, an energy storage device, a first inverter, a plurality of rectifiers, a wind power generator set, a diesel oil generator set, an alternating current load, an alternating current bus and a control device, wherein the wind power generator set and the diesel oil generator set are respectively connected in parallel with the direct current bus through the rectifiers so as to rectify output alternating current power through the rectifiers and convey the alternating current power to the direct current bus; then the direct current bus is connected with the alternating current bus through a first inverter so as to supply power to the alternating current load; the diesel oil generator set is directly connected with the alternating current bus to supply backup power to the alternating current load; the energy storage device is connected in parallel with the direct current bus and is used for raising or stabilizing the voltage of the direct current bus. The micro power grid system provided by the invention takes wind energy as main power generation energy, so that rich wind resources can be fully used; by the adoption of wind power generation, the micro power grid system has the advantages of small occupied area, typhoon resistance and continuity in power supplying at night and can be applied to special districts such as an island.
Description
Technical field
The present invention relates to micro-electric power network technique field, more particularly, relate to a kind of micro-grid system.
Background technology
Current micro-grid system is made up of solar power silicon plate, storage battery and diesel engine conventionally, and the main source of micro-grid system electric energy is to utilize solar panel to carry out photovoltaic generation.Owing to adopting, photovoltaic generation has that floor space is large, anti-typhoon capacity is poor, night can not continued power etc. shortcoming, therefore, this micro-grid system is not suitable for that the island little in floor space, typhoon is stronger (for example Nansha Islands and the Xisha Islands) are upper to be used.Therefore, how providing a kind of can this special regional micro-grid system using be those skilled in the art's technical problems urgently to be resolved hurrily on similar island.
Summary of the invention
In view of this, the invention provides a kind of micro-grid system, to solve the problem of the micro-grid system that is not applicable to this special area use in similar island at present.
A kind of micro-grid system, comprising:
DC bus;
Be connected in respectively energy storage device, the first inverter and several rectifiers on described DC bus in parallel;
Wind turbine generator, each described rectifier is connected with one or multiple described wind turbine generator, and the alternating current that described wind turbine generator is sent is delivered to described DC bus after by described rectifier rectification;
Diesel generating set, each described rectifier is connected with one or multiple described diesel generating set, and the alternating current that described diesel generating set sends is delivered to described DC bus after by described rectifier rectification;
AC load;
Ac bus, described ac bus is connected in parallel with described diesel generating set, described the first inverter and described AC load respectively;
Control device, described control device is connected with described DC bus, described wind turbine generator, described diesel generating set, described energy storage device, described the first inverter and described AC load respectively, described control device, according to state-of-charge, the power output of current described wind turbine generator, the energy storage capacity of current described energy storage device and the power demands of described AC load of current described DC bus, is controlled the power generation mode of described micro-grid system.
Preferably, described energy storage device comprises: batteries, described batteries is connected in parallel on described DC bus and with described control device and is connected.
Preferably, described batteries comprises multiple lead acid accumulators that are connected in series.
Preferably, described energy storage device also comprises: super capacitor;
Described super capacitor is connected in parallel on described DC bus, for supplementing in time the sudden change of described AC load or the generating output mutation in the situation that or absorbing electric energy.
Preferably, described batteries is connected with described control device by battery management system, described battery management system is for the operating state of described batteries is monitored, and discharging and recharging according to batteries described in the control signal control of described control device output.
Preferably, also comprise: the second inverter;
Described the second inverter is connected in parallel with described DC bus and described ac bus respectively, and described the second inverter and described the first inverter are for subsequent use each other.
Preferably, also comprise: circuit breaker;
The main coil of described circuit breaker is connected with described ac bus; the first auxiliary switch contact of described circuit breaker is connected with described the first inverter; the second auxiliary switch contact is connected with described diesel generating set, and described circuit breaker is used for overvoltage protection, overcurrent protection and switches the power generation mode of described micro-grid system.
Preferably, also comprise: the first protective circuit and the second protective circuit;
Described the first protective circuit is connected between described DC bus and described the first inverter, for in the time that overvoltage, overcurrent appear in described DC bus, disconnect described energy storage device, described the first inverter and rectifier described in several that described circuit breaker is connected in parallel with protection and described DC bus;
Described the second protective circuit is connected between described DC bus and described the second inverter; for in the time that overvoltage, overcurrent appear in described DC bus, disconnect described energy storage device, described the second inverter and rectifier described in several that described circuit breaker is connected in parallel with protection and described DC bus.
Preferably, the main coil of described circuit breaker is connected with described ac bus by transformer.
Preferably, also comprise: DC load;
Described DC load and described DC bus are connected in parallel.
Can find out from above-mentioned technical scheme, the invention provides a kind of micro-grid system, comprise: DC bus, energy storage device, the first inverter, several rectifiers, wind turbine generator, diesel generating set, AC load, ac bus and control device, wind turbine generator, diesel generating set are connected in parallel by rectifier and DC bus respectively, thereby the alternating current sending is delivered to DC bus after by rectifier rectification, and then DC bus is connected to AC load and powers with ac bus by the first inverter; Diesel generating set is directly connected to AC load with ac bus provides standby to power; Energy storage device and DC bus are connected in parallel, for raising or the voltage of stable DC bus.Micro-grid system provided by the invention is using wind energy as main power generation energy resource, therefore can make full use of abundant wind-resources, owing to adopting, wind power generation has advantages of that floor space is little, Anti-Typhoon, night can continued power, therefore micro-grid system provided by the invention can be applied in this special area, similar island, thereby has solved a difficult problem of the prior art.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the disclosed a kind of micro-grid system of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of structural representation of micro-grid system, micro-grid system comprises:
DC bus 11;
Be connected in respectively energy storage device 12, the first inverter 13 and several rectifiers 14 on DC bus 11 in parallel;
Wind turbine generator 15, each rectifier 14 is connected with one or multiple wind turbine generator 15, and the alternating current that wind turbine generator 15 is sent is delivered to DC bus 11 after by rectifier 14 rectifications;
Diesel generating set 16, each rectifier 14 is connected with one or multiple diesel generating set 16, and the alternating current that diesel generating set 16 sends is delivered to DC bus 11 after by rectifier 14 rectifications;
AC load 17;
Ac bus 18, ac bus is connected in parallel with diesel generating set 16, the first inverter 13 and AC load 17 respectively;
Control device 19, control device 19 is connected with DC bus 11, wind turbine generator 15, diesel generating set 16, energy storage device 12, the first inverter 13 and AC load 17 respectively, control device 19, according to the state-of-charge of current DC bus 11, power output, the energy storage capacity of current energy storage device 12 and the power demands of AC load 17 of current wind turbine generator 15, is controlled the power generation mode of micro-grid system.
Wherein, AC load 17 comprises HVAC system 171, water system 172, oil supply system 173, life and other 174 and sensitive loads 175.
It should be noted is that, the number of wind turbine generator 15 and diesel generating set 16 is determined by the demand of each project, in the time that electricity needs is larger, the mesh power of generating set 15 and diesel generating set 16 accordingly can also breeze up, wherein, the number of diesel generating set 16 and capacity largely depend on the load that sensitive loads 175(has relatively high expectations to electric power) number.
Suppose certain project for be power load in 400kW-500kW left and right, in micro-grid system, can adopt the diesel generating set 16 of 15 and 2 200kW of wind turbine generator of 3 200kW, it is in order to guarantee in the time that wind turbine generator 15 has half operation, by diesel generating set 16 is come into operation and still can meet the power demands to load that wind turbine generator 15 and diesel generating set 16 adopt this matching way.
By investigation, be similar to the such island in the Nansha Islands and the Xisha Islands, power load is generally 400kW left and right, therefore, adopts micro-grid system provided by the invention can meet the power demands to load on island.
It should be noted is that, the work operational mode of micro-grid system disclosed by the invention can be divided into wind storage power generation mode, wind bavin storage power generation mode and pure diesel generation pattern.
Wherein, wind storage power generation mode refers in micro-grid system wind turbine generator 15 as main power source, system power load is mainly provided by wind turbine generator 15 and energy storage device 12, in the time that the power output of wind turbine generator 15 is less than power load, difference capacity is supplied with by energy storage device 12, in the time that the power output of wind turbine generator 15 is greater than power load, the ability having more is charged to energy storage device 12.
The power output that wind bavin storage power generation mode refers to wind turbine generator 15 in micro-grid system is less than power load, the electric weight that energy storage device 12 is stored is simultaneously lower than threshold value, at this moment in order to stablize the voltage of micro-grid system, meet the demand of power load, add diesel generating set 16 that load electricity consumption is provided, in this power generation mode, wind turbine generator 15, diesel generating set 16 and energy storage device 12 are all worked.
Pure diesel generation pattern refers to diesel generating set 16 in micro-grid system and works independently, for power load provides the alternating current of constant voltage/constant frequency.
Micro-grid system provided by the invention is in actual motion, take the state-of-charge of the power output situation of current wind turbine generator 15, DC bus 11, electric weight that energy storage device 12 is stored is how many and power load is big or small as foundation, effectively to use regenerative resource and rationally to use energy storage device 12 as principle, store up under power generation mode, wind bavin storage power generation mode and pure diesel generation pattern and work at wind according to the operation strategy setting, automatically switch according to the change of the running status in micro-grid system and power load state.
Switching between three kinds of work operational modes of micro-grid system is specific as follows:
While adopting wind storage power generation mode, if the power output of wind turbine generator 15 is not enough to meet power load demand or energy storage device 12 storing electricity deficiencies, the work operational mode of micro-grid system switches to wind bavin storage power generation mode by wind storage power generation mode; If the first inverter 13 faults or wind turbine generator 15 faults, the work operational mode of micro-grid system switches to pure diesel generation pattern by wind storage power generation mode.
While adopting wind bavin storage power generation mode, if the power output of wind turbine generator 15 is greater than power load, the work operational mode of micro-grid system switches to wind storage power generation mode by wind bavin storage power generation mode; If wind turbine generator 15 breaks down because fault causes shutdown or the first inverter 13, the work operational mode of micro-grid system switches to pure diesel generation pattern by wind bavin storage power generation mode.
While adopting pure diesel generation pattern, be greater than power load if micro-grid system recovers the power output of normal and wind turbine generator 15, the work operational mode of micro-grid system switches to wind storage power generation mode by pure diesel generation pattern; If when wind turbine generator 15 restores electricity or energy storage device 12 electric weight are sufficient, but the power output of wind turbine generator 15 is not enough to meet power load demand, the work operational mode of micro-grid system switches to wind bavin storage power generation mode by pure diesel generation pattern.
Switch to example with wind storage power generation mode and wind bavin storage power generation mode, handoff procedure specifically set forth:
In the time that micro-grid system starts for the first time, first start a diesel generating set 16, by being delivered to DC bus 11 after rectifier 14 rectifications, DC bus 11 is charged, DC bus 11 charges to energy storage device 12 simultaneously, when energy storage device 12 is full of after electricity, starting energy storage device 12 discharges (certain for the voltage of raising DC bus 11, energy storage device 12 is sometimes also for the voltage of stable DC bus 11), for providing, wind turbine generator 15 starts required electric power, then start wind turbine generator 15 and the first inverter 13 is incorporated to ac bus 18, power to AC load 17.If the power output of wind turbine generator 15 meets the power demands of AC load 17, diesel generating set 16 to be shut down, the first inverter 13 switches to independent operation mode.
In the time that the first inverter 13 is operated in independent operation mode, if the power output of wind turbine generator 15 cannot meet the power demands of AC load 17, first closing the first inverter 13 works, ac bus 18 has a power failure, then a diesel generating set 16 powers to ac bus 18, after ac bus 18 is stable, restart that the first inverter 13 is grid-connected is incorporated to DC bus 11 by diesel generating set 16, power to AC load 17.
In a word, micro-grid system provided by the invention uses wind power generation to greatest extent.
Wherein, the first inverter 13 has two kinds of mode of operations, and one is grid-connected pattern, and one is independent operation mode, and these two kinds of patterns are mutually switched specific time.
In summary it can be seen, micro-grid system provided by the invention is using wind energy as main power generation energy resource, therefore can make full use of abundant wind-resources, owing to adopting, wind power generation has advantages of that floor space is little, Anti-Typhoon, night can continued power, therefore micro-grid system provided by the invention can be applied in this special area, similar island, thereby has solved a difficult problem of the prior art.
Preferably, energy storage device 12 comprises: batteries 121, batteries 121 is connected in parallel on DC bus 11 and with control device 19 and is connected.
In the time of power output that batteries 121 is 100kW, batteries 121 at least can load-supporting work half an hour, if the each depth of discharge of batteries 121 is no more than 25% of its capacity, sustainable 8-10 of the life-span of batteries 121.
Wherein, batteries 121 comprises the storage battery of multiple lead acid accumulators that are connected in series or other type.
It should be noted that, batteries 121 is by battery management system (Battery ManagementSystem, BMS) 122 are connected with control device 19, BMS122 is for monitoring the operating state of batteries 121, and the discharging and recharging of the control signal control batteries 121 of exporting according to control device 19.
For further optimizing above-described embodiment, energy storage device 12 also comprises: super capacitor 123, super capacitor 123 is connected in parallel on DC bus 11, for supplementing in time in the situation that AC load 17 is suddenlyd change or generate electricity output mutation or absorption electric energy.
It should be noted that, what the energy storage device 12 in the present invention adopted is super capacitor 123 and batteries 121 complementary types.
Super capacitor 122 has the advantages that rapid large-current discharges and recharges, be mainly used in power adjustments, the in the situation that of load changing or generating output mutation, can supplement in time or absorb electric energy, its effect is equivalent to strengthen DC bus 11 storage capacities, also helps the voltage with stable DC bus 11 simultaneously.
For further optimizing above-described embodiment, micro-grid system also comprises: the second inverter 20;
The second inverter 20 is connected in parallel with DC bus 11 and ac bus 18 respectively, and the second inverter 20 and the first inverter 13 are for subsequent use each other.
For further optimizing above-described embodiment, micro-grid system also comprises: circuit breaker 21;
The main coil of circuit breaker 21 is connected with ac bus 18; the first auxiliary switch contact of circuit breaker 21 is connected with the first inverter 13; the second auxiliary switch contact is connected with diesel generating set 16, and circuit breaker 21 is for the power generation mode of overvoltage protection, overcurrent protection and switching micro-grid system.
It should be noted is that, in the time having two inverters in micro-grid system, the first auxiliary switch contact of circuit breaker 21 is connected with the common port of two inverters (the first inverter 13 in Fig. 1 and the second inverter 20).
For further optimizing above-described embodiment, micro-grid system, also comprises: the first protective circuit 22 and the second protective circuit 23;
The first protective circuit 22 is connected between DC bus 11 and the first inverter 13, for in the time there is overvoltage, overcurrent in DC bus 11, the equipment such as energy storage device 12, the first inverter 13 and several rectifiers 14 that cut-off breaker 21 is connected with DC bus 11 with protection;
The second protective circuit 23 is connected between DC bus 11 and the second inverter 20, for in the time there is overvoltage, overcurrent in DC bus 11, the equipment such as energy storage device 12, the second inverter 20 and several rectifiers 14 that cut-off breaker 21 is connected with DC bus 11 with protection;
It should be noted is that, the main coil of circuit breaker 21 is connected with ac bus 18 by transformer 24.
It will be appreciated by persons skilled in the art that DC bus 11 can also be connected in parallel with DC load, think DC load power supply.
It should be noted is that, all hardware devices of micro-grid system provided by the invention meet offshore applications requirement, possess the service condition under high humility, hypersaline environment.
In summary it can be seen, micro-grid system provided by the invention has been filled up the use blank of wind turbine generator 15 in micro-grid system, wind turbine generator 15 has the little and Anti-Typhoon innate advantage of occupation of land simultaneously, therefore, micro-grid system provided by the invention is applicable to being applied on the abundant island of wind energy resources, wind turbine generator 15 is formed to complemental power-generation in conjunction with energy storage device 12, diesel generating set 16, for providing, island produce and the required electric current of living, thereby improve island living environment, and then developed the economy on island.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a micro-grid system, is characterized in that, comprising:
DC bus;
Be connected in respectively energy storage device, the first inverter and several rectifiers on described DC bus in parallel;
Wind turbine generator, each described rectifier is connected with one or multiple described wind turbine generator, and the alternating current that described wind turbine generator is sent is delivered to described DC bus after by described rectifier rectification;
Diesel generating set, each described rectifier is connected with one or multiple described diesel generating set, and the alternating current that described diesel generating set sends is delivered to described DC bus after by described rectifier rectification;
AC load;
Ac bus, described ac bus is connected in parallel with described diesel generating set, described the first inverter and described AC load respectively;
Control device, described control device is connected with described DC bus, described wind turbine generator, described diesel generating set, described energy storage device, described the first inverter and described AC load respectively, described control device, according to state-of-charge, the power output of current described wind turbine generator, the energy storage capacity of current described energy storage device and the power demands of described AC load of current described DC bus, is controlled the power generation mode of described micro-grid system.
2. micro-grid system according to claim 1, is characterized in that, described energy storage device comprises: batteries, described batteries is connected in parallel on described DC bus and with described control device and is connected.
3. micro-grid system according to claim 2, is characterized in that, described batteries comprises multiple lead acid accumulators that are connected in series.
4. micro-grid system according to claim 2, is characterized in that, described energy storage device also comprises: super capacitor;
Described super capacitor is connected in parallel on described DC bus, for supplementing in time the sudden change of described AC load or the generating output mutation in the situation that or absorbing electric energy.
5. micro-grid system according to claim 2, it is characterized in that, described batteries is connected with described control device by battery management system, described battery management system is for the operating state of described batteries is monitored, and discharging and recharging according to batteries described in the control signal control of described control device output.
6. micro-grid system according to claim 1, is characterized in that, also comprises: the second inverter;
Described the second inverter is connected in parallel with described DC bus and described ac bus respectively, and described the second inverter and described the first inverter are for subsequent use each other.
7. micro-grid system according to claim 6, is characterized in that, also comprises: circuit breaker;
The main coil of described circuit breaker is connected with described ac bus; the first auxiliary switch contact of described circuit breaker is connected with described the first inverter; the second auxiliary switch contact is connected with described diesel generating set, and described circuit breaker is used for overvoltage protection, overcurrent protection and switches the power generation mode of described micro-grid system.
8. micro-grid system according to claim 7, is characterized in that, also comprises: the first protective circuit and the second protective circuit;
Described the first protective circuit is connected between described DC bus and described the first inverter, for in the time that overvoltage, overcurrent appear in described DC bus, disconnect described energy storage device, described the first inverter and rectifier described in several that described circuit breaker is connected in parallel with protection and described DC bus;
Described the second protective circuit is connected between described DC bus and described the second inverter; for in the time that overvoltage, overcurrent appear in described DC bus, disconnect described energy storage device, described the second inverter and rectifier described in several that described circuit breaker is connected in parallel with protection and described DC bus.
9. micro-grid system according to claim 7, is characterized in that, the main coil of described circuit breaker is connected with described ac bus by transformer.
10. micro-grid system according to claim 1, is characterized in that, also comprises: DC load;
Described DC load and described DC bus are connected in parallel.
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| CN110556817A (en) * | 2019-09-16 | 2019-12-10 | 珠海格力电器股份有限公司 | direct-current micro-grid system and control method thereof |
| CN110556817B (en) * | 2019-09-16 | 2021-01-15 | 珠海格力电器股份有限公司 | Direct-current micro-grid system and control method thereof |
| CN112952796A (en) * | 2020-12-31 | 2021-06-11 | 中国电力工程顾问集团中南电力设计院有限公司 | Power utilization system wiring of offshore flexible direct current converter station and operation method thereof |
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