CN103595072A - Method of micro-grid for seamless switching from off-grid state to grid-connection state - Google Patents

Method of micro-grid for seamless switching from off-grid state to grid-connection state Download PDF

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Publication number
CN103595072A
CN103595072A CN201310594628.4A CN201310594628A CN103595072A CN 103595072 A CN103595072 A CN 103595072A CN 201310594628 A CN201310594628 A CN 201310594628A CN 103595072 A CN103595072 A CN 103595072A
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China
Prior art keywords
grid
microgrid
power source
main
switch
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CN201310594628.4A
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Chinese (zh)
Inventor
柳劲松
时珊珊
恽峥
周健
杨心刚
徐琴
刘舒
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国网上海市电力公司
华东电力试验研究院有限公司
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Priority to CN201310594628.4A priority Critical patent/CN103595072A/en
Publication of CN103595072A publication Critical patent/CN103595072A/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention relates to a method of a micro-grid for seamless switching from the off-grid state to the grid-connection state. The method of the micro-grid for seamless switching from the off-grid state to the grid-connection state comprises the steps that after a large power grid recovers the normal state, and the situation that the phases of the voltage on the two sides of a grid-connection switch are equal, and the amplitudes of the voltage on the two sides of the grid-connection switch are equal is detected, the grid-connection switch is turned on, inverters in the micro-grid are switched to a main power grid to work, and the large power grid works by carrying the adjustable load. Reliability of power supply is high, when an external power grid has a fault, it is ensured that electricity is continuously supplied to the load in the micro-grid, and the problem that in the prior art, when off-grid/grid-connection switching of the micro-grid is carried out, due to the fact that the condition of the outage for a short time exists, reliability of power supply is poor can be solved.

Description

A kind of microgrid is by the method from net to grid-connected seamless switching
Technical field
The present invention relates to microgrid field, be specifically related to a kind of microgrid by the method from net to grid-connected seamless switching.
Background technology
Along with the development of distributed power generation and modern power systems, microgrid is suggested as a kind of novel distribution solution, and it can not only improve power supply quality and reliability, and can alleviate the energy and ambient pressure, has therefore won more and more widely and has paid attention to.Microgrid, as the higher structure form of distributed power generation, can be organized multiple distributed power source, load, energy storage effectively, both can be incorporated into the power networks with the large electrical network in outside, also can be from network operation, and its Supply Security and reliability are higher.Along with the fast development of the regenerative resource distributed power generations such as wind-powered electricity generation, photovoltaic, the regenerative resource microgrid that comprises wind-powered electricity generation and photovoltaic has a good application prospect.
Different from traditional electrical network, the system inertia of microgrid is little, and wind-powered electricity generation and photovoltaic are subject to the impact of natural conditions, and power output has the feature of intermittent and randomness, along with the continuous increase of this class distributed power source access ratio, bring certain negative effect to operation stability and the power supply reliability of system.At present, microgrid operates mainly in grid-connected or under two kinds of operational modes of net, microgrid, when from network operation, is generally undertaken networking power supply by stable output power and the larger power supply of capacity, sets up and maintain voltage and the frequency of system.Miniature gas turbine, diesel generating set, energy storage etc. all can be used as networking power supply.Compare with the above two, energy storage is when serving as networking power supply, more flexible, convenient in control, in microgrid, configure the energy storage of certain capacity, by handling up of gain merit/reactive power of flexible rapid adjustment, can suppress to a certain extent the fluctuation of fitful power and be difficult to predictability, realize microgrid from net or be incorporated into the power networks stable and reliable.
The control mode of microgrid its inner transformation device under different operational modes is different, how between two kinds of patterns, to realize seamless switching, making the operational mode of microgrid switch the disturbance minimum to load and electrical network, is to realize the maximized key control technology of distributed energy utilance.Seamless switching between microgrid and large electrical network, can guarantee the power supply reliability of important load in microgrid the safe and stable operation of large electrical network also to be had to important effect, as the important technology feature of microgrid, has caused widely and has paid attention to.Chinese scholars has been carried out corresponding research to the seamless switching technique of single inverter, multiple solution has been proposed, but have following shortcoming and defect: microgrid is in the handoff procedure from net/grid-connected or reach after stable state, its voltage waveform quality is all not ideal enough; Be only applicable to single distributed power source, do not pay close attention to the switching problem that comprises a plurality of converter microgrids, be not suitable for networking control strategy complicated in microgrid etc., many practical problems wait to solve.
Be limited to current technical merit, current domestic and even international each microgrid demonstration project, for the microgrid containing multiple micro-source and the switching between electrical network greatly, that takes is seamed handover scheme substantially.Seamed switching in whole service process, there will be and have a power failure in short-term for twice, inefficiency, and affect the reliability of mains supply.
Summary of the invention
The object of this invention is to provide a kind of microgrid by the method from net to grid-connected seamless switching, the method is after large power system restoration is normal, when the phase place that grid-connected switch both sides voltage detected is equal with amplitude, grid-connected switch closes, and then the inverter in microgrid is switched to main operation of power networks, by large electrical network band tunable load, moved, power supply reliability is high, externally during electric network fault, still can maintain the not power-off of microgrid internal loading, in order to solve in prior art, microgrid is during from net/grid-connected switching, owing to having the situation of short supply interruption, the problem that power supply reliability is poor.
For achieving the above object, the solution of the present invention is: a kind of microgrid is by the method from net to grid-connected seamless switching, this microgrid is a comprehensive microgrid that comprises miniature wind power generation system, multiple photovoltaic generating system and energy-storage system, described energy-storage system, photovoltaic generating system and wind generator system are connected main bus bar and test bus by corresponding bus-tie circuit breaker, on test bus, be connected with adjustable test load, described microgrid adopts master-slave control strategy, and described seamless handover method comprises the steps:
(1) when the large electrical network in outside breaks down, turn-off grid-connected switch, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter are incorporated to test bus operation, by microgrid free band tunable load, are worked, and microgrid is in from network operation pattern;
(2) after the large power system restoration in outside is normal, normal if main power source controller detects large line voltage, using current large line voltage as the output voltage reference value of main power source controller, constantly adjust the output voltage of main power source controller;
(3) after main power source controller detects the output voltage of main power source controller and the phase place of large line voltage and amplitude and equates, grid-connected switch closes, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter switch to main bus bar operation, by the large electrical network bringing onto load in outside, worked, main power source controller switches to Current Control by voltage control simultaneously, from power supply, operate in all the time current control mode, complete microgrid from from net to grid-connected seamless switching.
One end of described test bus is connected with the first mother cable, one end of described main bus bar is connected with the second mother cable, the other end of described test bus and main bus bar is connected large electrical network by grid-connected switch, and described the first mother cable is all connected energy-storage system, photovoltaic generating system and wind generator system by a bus-tie circuit breaker with the second mother cable.
Described photovoltaic generating system comprises the photovoltaic of monocrystalline silicon, polysilicon, diaphragm type and light collecting various ways.
The beneficial effect that the present invention reaches: seamless handover method of the present invention, at microgrid when from net to grid-connected conversion, detect large line voltage normal after, be not directly disconnect the interior inverter of microgrid and test being connected of bus, but after the phase place that grid-connected switch both sides voltage detected equates with amplitude, grid-connected switch closes, and then the inverter in microgrid is switched to main operation of power networks, by large electrical network band tunable load, moved, therefore, the method is externally during electric network fault, can keep the load uninterrupted power supply in microgrid, increase work efficiency, strengthened the reliability of mains supply.
Accompanying drawing explanation
Fig. 1 is the structural representation of microgrid of the present invention;
Fig. 2 is that microgrid of the present invention is by the flow chart from net to grid-connected switching.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Microgrid of the present invention is a comprehensive microgrid that comprises miniature wind power generation system, multiple photovoltaic generating system and energy-storage system, described energy-storage system, photovoltaic generating system and wind generator system are connected main bus bar and test bus by corresponding bus-tie circuit breaker, on test bus, be connected with adjustable test load, described microgrid adopts master-slave control strategy, using energy-storage system as main power source, photovoltaic generating system and wind generator system are as from power supply, and this microgrid is comprised the steps: by the method from net to grid-connected seamless switching
(1) when the large electrical network in outside breaks down, turn-off grid-connected switch, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter are incorporated to test bus operation, by microgrid free band tunable load, are worked, and microgrid is in from network operation pattern;
(2) after the large power system restoration in outside is normal, normal if main power source controller detects large line voltage, using current large line voltage as the output voltage reference value of main power source controller, constantly adjust the output voltage of main power source controller;
(3) after main power source controller detects the output voltage of main power source controller and the phase place of large line voltage and amplitude and equates, grid-connected switch closes, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter switch to main bus bar operation, by the large electrical network bringing onto load in outside, worked, main power source controller switches to Current Control by voltage control simultaneously, from power supply, operate in all the time current control mode, complete microgrid from from net to grid-connected seamless switching.
As Fig. 1, microgrid of the present invention is one and comprises miniature wind power generation system, the comprehensive microgrid of multiple photovoltaic generating system and energy-storage system, on test bus, be connected with adjustable test load, microgrid adopts master-slave control strategy, the present embodiment, using energy-storage system as main power source, photovoltaic generating system and wind generator system are as from power supply, one end of described test bus is connected with the first mother cable, one end of described main bus bar is connected with the second mother cable, the other end of described main bus bar is incorporated to large electrical network by grid-connected switch, the other end of described test bus accesses the power outlet end of large electrical network, described the first mother cable is all connected energy-storage system by a bus-tie circuit breaker with the second mother cable, photovoltaic generating system and wind generator system, photovoltaic generating system comprises monocrystalline silicon, polysilicon, the photovoltaic of diaphragm type and light collecting various ways.
It is grid-connected and from two kinds of operational modes of net that the operation of microgrid has, externally during large electric network fault, need to be switched to from network operation, when the large power system restoration in outside, be switched to and be incorporated into the power networks again, when microgrid is incorporated into the power networks, grid-connected switch is closed, energy-storage system, photovoltaic generating system and wind generator system are connected with main bus bar, by large electrical network to adjustable test load supplying; When microgrid is during from network operation, disconnect grid-connected switch, energy-storage system, photovoltaic generating system and wind generator system are switched to and test bus and be connected, by energy-storage system, photovoltaic generating system and wind generator system, to tunable load, powered, grid-connected/off-grid switching mode mainly contains seamed switching and seamless switching.
For the seamed switching that allows to have a power failure in short-term:
When the large electric network fault in outside, first power-off of the distributed power source in microgrid for inverter, stops trigger impulse that is:, for synchronous generator, can be in stand-by state, and the contactor that opening power is connected with outside large electrical network; Then disconnect microgrid and the outside grid-connected switch of electrical network greatly, microgrid internal loading has a power failure in short-term; After confirming that the grid-connected switch of microgrid with outside large electrical network disconnects, switch dual, to inverter control pattern, re-establishes voltage and the frequency of microgrid, microgrid independent operating.It is that outside large power system restoration to be detected normal that microgrid is switched to grid-connected criterion from independent operating, main power source in microgrid is first out of service, that is: trigger impulse shutoff or generator enter spinning reserve state, microgrid decompression, load short supply interruption, other distributed power source is detecting and the operation of site decompression backed off after random, the grid-connected switch of closed microgrid, load restoration power supply, behind certain hour interval, all distributed power sources in microgrid are grid integration microgrid 400V main bus bar again.The concrete implementing procedure of seamed switching is as follows:
When external electrical network breaks down, grid-connected bus loss of pressure, mode controller is after the voltage that outside large electrical network detected is undesired, in microgrid, all inverters automatically shut down, disconnect the grid-connected switch that microgrid is connected with large electrical network, after confirming that microgrid and outside grid-connected switch disconnect, to the lower expression patterns conversion instruction of two-way inverter (energy storage or straight/friendship inverter), two-way inverter proceeds to constant voltage/constant frequency and controls, free band load running, blower fan inverter, photovoltaic DC-to-AC converter detect grid-connected busbar voltage normal after, again be incorporated to the operation of microgrid adjustable test load connected test bus.
After external electrical network is recovered normally, mode controller detect outside large line voltage normal after, first turn-off two-way inverter, turn-off subsequently blower fan, photovoltaic DC-to-AC converter (exchanging in microgrid situation), then the grid-connected switch of closed microgrid, is moved by outside large electrical network band tunable load.All inverters, after the voltage that outside large electrical network detected recovers normally, are switched to the operation of 400V main bus bar, and now storage battery enters grid-connected charged state.
Seamedly switch in grid-connectedly while turning lonely net, open after grid-connected switch, first open all inverter switching devices that are connected to microgrid 400V main bus bar, more all inverter switching devices that are connected to microgrid 400V experiment bus that close; When lonely net turns grid-connected, first open all inverter switching devices that are connected to microgrid 400V experiment bus, more all inverter switching devices that are connected to microgrid 400V main bus bar that close, grid-connected switch finally closes.
Seamed switching is not subject to the impact of the two-way inverter operating mode of energy-storage system, is the asynchronism(-nization) of changing under different operating modes.During two-way inverter standby, when two-way inverter is shut down, it is long from the time of shutting down standby and preparing that this is mainly two-way inverter in 30s left and right pattern change-over time in 10s left and right pattern change-over time.During two-way invertor operation, pattern change-over time is in 35s left and right.Seamed switching in whole switchover operation process, there will be and have a power failure in short-term for twice, causes operation of power networks unstable, and power supply reliability is poor.
For seamless switching:
The power supply reliability of seamless switching is high, externally during electric network fault, still can maintain the not power-off of microgrid internal loading, but microgrid is controlled and had relatively high expectations.Be limited to current technical merit, domestic and even international each microgrid demonstration project, that takes is seamed handover scheme substantially.With current technical merit, microgrid is realized and is also had equipment and technical difficulty from the seamless islet operation that proceeds to that is incorporated into the power networks, and temporarily cannot realize; Microgrid from islet operation seamless proceed to be incorporated into the power networks possess realization may.
While adopting the scheme of seamless switching, microgrid detect power system restoration normal after, microgrid from islet operation seamless proceed to be incorporated into the power networks, should first guarantee that voltage magnitude, phase place and the frequency of grid-connected switch both sides equates, also should be able to reduce the rush of current after switching simultaneously.For the microgrid that adopts master-slave control strategy, require the main power source can be fast from carrying out the switching of grid-connected and independent control model, and need can be fast by the grid-connected switch of microgrid and main grid disconnection simultaneously.In addition, at microgrid, from lonely net, proceed to when grid-connected, because the electric voltage frequency of grid-connected switch ends is not identical, microgrid also need can according to and voltage and the frequency of site adjust, guarantee that the voltage of microgrid is consistent with main electrical network with frequency, then examine simultaneous interconnecting.
As Fig. 2, the invention provides a kind of microgrid by the method from net to grid-connected seamless switching, the detailed process of the method is as follows:
(1) when the large electrical network in outside breaks down, turn-off grid-connected switch, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter are incorporated to test bus operation, by microgrid free band tunable load, are worked, and microgrid is in from network operation pattern;
(2) after the large power system restoration in outside is normal, normal if main power source controller detects large line voltage, using current large line voltage as the output voltage reference value of main power source controller, constantly adjust the output voltage of main power source controller;
(3) both sides of grid-connected switch when main power source controller, detected, after the phase place of the output voltage of main power source controller and large line voltage and amplitude equate, grid-connected switch closes, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter switch to main bus bar operation, by the large electrical network bringing onto load in outside, worked, simultaneously main power source controller switches to Current Control by voltage control, from power supply, operates in all the time current control mode, completes microgrid from from net to grid-connected seamless switching.
After microgrid operational mode has been switched, according to microgrid power producing characteristics, progressively increase or reduce distributed power source in microgrid and exert oneself.
Seamless handover method of the present invention, at microgrid when from net to grid-connected conversion, detect large line voltage normal after, be not directly disconnect the interior inverter of microgrid and test being connected of bus, but after the phase place that grid-connected switch both sides voltage detected equates with amplitude, grid-connected switch closes, and then the inverter in microgrid is switched to main operation of power networks, by large electrical network band tunable load, moved, therefore, the method externally during electric network fault, can keep the load uninterrupted power supply in microgrid, increase work efficiency, strengthened the reliability of microgrid work.

Claims (3)

1. a microgrid is by the method from net to grid-connected seamless switching, this microgrid is one and comprises miniature wind power generation system, the comprehensive microgrid of multiple photovoltaic generating system and energy-storage system, described energy-storage system, photovoltaic generating system is connected main bus bar and test bus with wind generator system by corresponding bus-tie circuit breaker, on test bus, be connected with adjustable test load, described microgrid adopts master-slave control strategy, using energy-storage system as main power source, photovoltaic generating system and wind generator system are as from power supply, it is characterized in that: described seamless handover method comprises the steps:
(1) when the large electrical network in outside breaks down, turn-off grid-connected switch, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter are incorporated to test bus operation, by microgrid free band tunable load, are worked, and microgrid is in from network operation pattern;
(2) after the large power system restoration in outside is normal, normal if main power source controller detects large line voltage, using current large line voltage as the output voltage reference value of main power source controller, constantly adjust the output voltage of main power source controller;
(3) after main power source controller detects the output voltage of main power source controller and the phase place of large line voltage and amplitude and equates, grid-connected switch closes, two-way inverter, blower fan inverter and photovoltaic DC-to-AC converter switch to main bus bar operation, by the large electrical network bringing onto load in outside, worked, main power source controller switches to Current Control by voltage control simultaneously, from power supply, operate in all the time current control mode, complete microgrid from from net to grid-connected seamless switching.
2. microgrid according to claim 1 is by the method from net to grid-connected seamless switching, the one end that it is characterized in that described test bus is connected with the first mother cable, one end of described main bus bar is connected with the second mother cable, the other end of described test bus and main bus bar is connected large electrical network by grid-connected switch, and described the first mother cable is all connected energy-storage system, photovoltaic generating system and wind generator system by a bus-tie circuit breaker with the second mother cable.
3. microgrid according to claim 1, by the method from net to grid-connected seamless switching, is characterized in that described photovoltaic generating system comprises the photovoltaic of monocrystalline silicon, polysilicon, diaphragm type and light collecting various ways.
CN201310594628.4A 2013-11-21 2013-11-21 Method of micro-grid for seamless switching from off-grid state to grid-connection state CN103595072A (en)

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CN104410104A (en) * 2014-08-29 2015-03-11 国家电网公司 Microgrid with bidirectional relay protection device and grid-connected operation control method of microgrid
CN106233557A (en) * 2014-03-07 2016-12-14 Abb瑞士股份有限公司 The control of microgrid
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CN109256850A (en) * 2018-09-14 2019-01-22 浙江艾罗网络能源技术有限公司 Energy accumulation current converter and off-network switching device
CN110165701A (en) * 2019-05-06 2019-08-23 深圳中电长城能源有限公司 Virtual synchronous machine and off-network control method and micro-grid system in a kind of micro-grid system

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CN109256850A (en) * 2018-09-14 2019-01-22 浙江艾罗网络能源技术有限公司 Energy accumulation current converter and off-network switching device
CN110165701A (en) * 2019-05-06 2019-08-23 深圳中电长城能源有限公司 Virtual synchronous machine and off-network control method and micro-grid system in a kind of micro-grid system

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Application publication date: 20140219