CN104505867A - Alternating current and direct current hybrid micro-grid system and control strategy thereof - Google Patents

Alternating current and direct current hybrid micro-grid system and control strategy thereof Download PDF

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CN104505867A
CN104505867A CN201510001858.4A CN201510001858A CN104505867A CN 104505867 A CN104505867 A CN 104505867A CN 201510001858 A CN201510001858 A CN 201510001858A CN 104505867 A CN104505867 A CN 104505867A
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converter
grid
bus
energy
load
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CN201510001858.4A
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CN104505867B (en
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陈文波
王丽
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南京国臣信息自动化技术有限公司
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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

Abstract

The invention discloses an alternating current and direct current hybrid micro-grid system and a control strategy of the micro-grid system. The micro-grid system comprises multiple generation units, load, a distribution line for connecting the generation units and the loads, and a monitoring protection unit; each generation unit comprises a large power grid, grid-connected AC/DC (alternating current/direct current) of the large power grid, an energy storage system, a DC/DC (direct current/direct current) converter of the energy storage system, a wind power generation system, an AC/DC converter of the wind power generation system, a photovoltaic power generation system, a DC/DC converter of the photovoltaic power generation system, and a diesel generator; said load includes AC non-significant load, AC significant load, AC/DC load, DC significant load and DC non-significant load; the distribution line comprises a DC distribution line and an AC distribution line; the operating status of each energy conversion device can be monitored in real time by the monitoring protection unit, two operating ways such as grid connection and isolation of the system can be realized by different control strategies, the distributive generation unit and the energy storage unit realize coordination and cooperation by controlling energy storage DC/DC, photovoltaic DC/DC, and wind power AC/DC, so that the power supply reliability is improved and the significant load can continuously operate.

Description

A kind of alternating current-direct current mixing micro-grid system and control strategy thereof
Technical field
The present invention relates to a kind of micro-grid system, especially relate to a kind of alternating current-direct current mixing micro-grid system, also relate to the control strategy of above-mentioned alternating current-direct current mixing micro-grid system.
Background technology
According to U.S. CE RTS (the The Consortium for Electric Reliability Technology Solutions) definition to micro-capacitance sensor, the independent controllable system that micro-capacitance sensor is made up of load and distributed power source DGs (Distributed Generations), for locality provides electric energy and heat energy.
Distributed power source DGs is rapidly developed in recent years owing to many-sided advantage such as to pollute less, infield is flexible, but a large amount of DGs accesses electrical network also creates some harmful effects.Relative bulk power grid, micro-capacitance sensor is the mode of receiving distributed power source more friendly.
New material, the tremendous development of information technology and power electronic technology and extensive use, user is to need for electricity, the quality of power supply and power supply reliability etc. require to improve constantly, particularly a large amount of uses of sensitive loads (being important load mostly) in modern chemical industry business development, very high to the requirement of power supply reliability, even instantaneous voltage fluctuation is as voltage dip, short interruptions all can cause unit trip to shut down, huge economic loss is caused even to cause human casualty accident, require to reach 99 (99.9999999%) or even 10 9 (99.99999999%) to power supply reliability.And the power supply reliability of conventional AC electrical network the chances are 49 (99.99%), the corresponding average interruption duration of user, substantially in 0.876h (about 53min) left and right, is estimated after 5 years, reach 59 (99.999%).This obviously can not meet the high power supply reliability requirement of important load.Existing interchange micro-capacitance sensor and DC micro-electric network technology, due to energy storage device finite energy, also cannot meet so high power supply reliability.
In conjunction with the advantage of distributed power generation, distributed energy storage, support in support with bulk power grid, alternating current-direct current mixing micro-capacitance sensor is obviously a kind of effective way improving power supply reliability, can be good at the demand meeting high power supply reliability while energy-conserving and environment-protective, ensures that important load runs without interruption.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is to provide a kind of alternating current-direct current mixing micro-grid system.
The technical problem that the present invention also will solve is to provide the control strategy of above-mentioned alternating current-direct current mixing micro-grid system.
For solving the problems of the technologies described above, the technology used in the present invention means are:
A kind of alternating current-direct current mixing micro-grid system, comprising multiple generator unit, load and the distribution line for being connected with load by generator unit, also comprising monitoring and protection unit; Described generator unit comprises bulk power grid and grid-connected AC/DC converter, energy-storage system and DC/DC converter thereof, wind generator system and AC/DC converter, photovoltaic generating system and DC/DC converter thereof and diesel engine generator; Described load comprises the load of interchange insignificant, exchanges important load, alternating current-direct current load, direct current important load and the load of direct current insignificant; Described distribution line comprises DC power distribution line and AC power distribution line;
Wherein, described grid-connected AC/DC converter AC is connected with bulk power grid, and DC side is connected with DC bus; Described energy storage DC/DC converter side is connected with energy-storage units, and opposite side is connected with DC bus; Described wind-force AC/DC converter side is connected with wind generator system, and opposite side is connected with DC bus; Described photovoltaic DC/DC converter side is connected with photovoltaic generating system, and opposite side is connected with DC bus;
The load of described interchange insignificant is connected with ac bus by DC/AC converter; Described interchange important load is connected with ac bus and is connected with DC bus by DC/AC converter simultaneously; Described alternating current-direct current load is connected with ac bus and is connected with DC bus by DC/DC converter simultaneously; Described direct current important load is connected with DC bus by DC/DC converter and is connected with ac bus by AC/DC converter simultaneously; The load of described direct current insignificant is connected with DC bus by DC/DC converter;
Described monitoring and protection unit is communicated by CAN and described grid-connected AC/DC converter, energy storage DC/DC converter, wind-force AC/DC converter, photovoltaic DC/DC converter and the DC/AC converter be connected with described interchange important load, the DC/DC converter be connected with described alternating current-direct current load, the DC/DC converter be connected with described direct current important load, the AC/DC converter be connected with described direct current important load, the DC/DC converter that is connected with the load of described direct current insignificant;
Described diesel engine generator is connected with ac bus.
Wherein, described grid-connected AC/DC converter is two-way AC/DC converter, adopts three phase full bridge topological structure.
Wherein, described energy storage DC/DC converter adopts full-bridge topologies.
Wherein, described photovoltaic DC/DC converter adopts Boost topological structure.
Wherein, described wind-force AC/DC converter adopts Boost topological structure.
A control strategy for alternating current-direct current mixing micro-grid system, the running status of each generator unit of described alternating current-direct current mixing micro-capacitance sensor is determined by d-c bus voltage value;
When photovoltaic generation and wind power generation summation are greater than bearing power, DC bus-bar voltage raises, when DC bus-bar voltage higher than grid-connected AC/DC converter commutation inversion switching value and energy-storage units is in full state time, whole system is in the pattern of being incorporated into the power networks, in order to preferentially utilize photovoltaic and wind energy, setting grid-connected AC/DC converter commutation inversion switching value is nominal DC bus voltage value, grid-connected AC/DC converter is in inverter mode, energy storage DC/DC converter is in stopped status, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern;
When photovoltaic generation and wind power generation summation are greater than bearing power, DC bus-bar voltage raises, when DC bus-bar voltage higher than grid-connected AC/DC converter commutation inversion switching value and energy-storage units is in underfill state time, whole system is in islet operation pattern, grid-connected AC/DC converter is in stopped status, energy storage DC/DC converter charges in constant current voltage limiting mode, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern;
When photovoltaic generation and wind power generation summation are greater than bearing power, and system is when being in islet operation pattern, grid-connected AC/DC converter is in stopped status, if energy-storage units is in underfill state, energy storage DC/DC converter charges in constant current voltage limiting mode, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern; If energy-storage units is in full state, energy storage DC/DC converter is in stopped status, and photovoltaic DC/DC converter and wind-force DC/DC converter are in constant voltage mode, and DC bus-bar voltage raises, until the maximum that the system that is stabilized in allows;
When photovoltaic generation and wind power generation summation are less than bearing power, DC bus-bar voltage declines, when DC bus-bar voltage is lower than grid-connected AC/DC converter commutation inversion switching value, system is in the pattern of being incorporated into the power networks, in order to preferentially utilize photovoltaic and wind energy, setting grid-connected AC/DC converter commutation inversion switching value is nominal DC bus voltage value, grid-connected AC/DC converter is in rectification state, if energy-storage units is in full state, energy storage DC/DC converter is shut down, otherwise energy storage DC/DC converter charges in constant current voltage limiting mode, photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern,
When photovoltaic generation and wind power generation summation are less than bearing power, DC bus-bar voltage reduces, system is in islet operation pattern, if now energy storage DC/DC converter is with the discharge threshold stable DC busbar voltage lower than nominal DC bus voltage value, grid-connected AC/DC converter is in stopped status, energy storage DC/DC converter discharges, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern;
When photovoltaic generation and wind power generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units magnitude of voltage lower than the first set point time, be ensure that important load runs without interruption, excision insignificant load;
When photovoltaic generation and wind power generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units magnitude of voltage lower than the second set point time, start diesel generating system, important load is powered by ac bus, ensure important load run without interruption.
Wherein, nominal DC busbar voltage is 480 ~ 500V; When energy-storage units is in full state, voltage is 540V; DC bus maximum allowable voltage is 510 ~ 520V; Energy-storage units voltage first set point is 450 ~ 460V; Energy-storage units voltage second set point is 400 ~ 410V.
Beneficial effect: alternating current-direct current mixing micro-grid system of the present invention is rationally distributed, comprise multiple generator unit and monitoring and protection unit, according to the actual needs, system is in grid-connected or islet operation pattern, when islet operation pattern, when the gross output of photovoltaic generation and wind power generation is not enough, within the time of 200us, namely can switch to energy storage DC/DC discharge, maintain the stable of DC bus-bar voltage, when energy-storage units voltage is lower than the second set point, diesel engine generator generating can be started in 1min, the alternating current of stable output, even if namely alternating current-direct current mixing micro-grid system of the present invention is when energy-storage units energy is used up, still diesel engine generator can be used to maintain important load run without interruption for a long time, alternating current-direct current mixing micro-grid system control strategy of the present invention farthest optimizes the Appropriate application of energy, optimize the operation of system, by different control strategies, system is in grid-connected or isolated island two kinds of operational modes, thus make system achieve reasonable management to distributed generation unit and energy-storage units and use, system maintains the stable of DC bus-bar voltage by the mutual cooperation of distributed generation unit and energy-storage units, the power supply reliability of raising system, ensure that important load runs without interruption for a long time.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of alternating current-direct current mixing micro-grid system of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, technology contents of the present invention is described further.
As shown in Figure 1, alternating current-direct current mixing micro-grid system of the present invention, comprise 5 generator units: bulk power grid and capacity thereof are the grid-connected AC/DC of 40kW, capacity is batteries energy-storage units and the energy storage DC/DC thereof of 30kW × 2h, energy balance is maintained by the discharge and recharge of energy-storage units, 20kW photovoltaic generating system and photovoltaic DC/DC, 20kW wind generator system thereof and wind-force DC/DC thereof and diesel generating system; Also comprise load and the distribution line for being connected with load by generator unit, load comprises 10kW and exchanges important load, 10kW alternating current-direct current load (refer to here can Alternating Current Power Supply also can the frequency converter of direct current supply), 10kW direct current important load, 20kW exchanges insignificant load and the load of 5kW direct current insignificant; Distribution line comprises DC power distribution line and AC power distribution line;
Grid-connected AC/DC AC is connected with bulk power grid, DC side and DC bus connect, energy storage DC/DC side is connected with energy-storage units, opposite side is connected with DC bus, photovoltaic DC/DC side is connected with photovoltaic generating system, opposite side is connected with DC bus, and wind-force AC/DC side is connected with wind generator system, and opposite side is connected with DC bus;
Exchange insignificant load to be connected with ac bus by DC/AC converter, the load of direct current insignificant is connected with DC bus by DC/DC converter, direct current important load is connected with DC bus by DC/DC converter and is connected with ac bus by AC/DC converter simultaneously, interchange important load is connected with ac bus and is connected with DC bus by DC/AC converter simultaneously, and alternating current-direct current load is connected with ac bus and is connected with DC bus by DC/DC converter simultaneously;
Alternating current-direct current mixing micro-grid system of the present invention is also provided with monitoring and protection unit, monitoring and protection unit by CAN and grid-connected AC/DC converter, energy storage DC/DC converter, photovoltaic DC/DC converter, wind-force AC/DC converter and with exchange the DC/AC converter that important load is connected, the DC/DC converter be connected with alternating current-direct current load, the DC/DC converter be connected with direct current important load, the AC/DC converter be connected with direct current important load, the DC/DC converter that is connected with the load of direct current insignificant communicate; The running status of each energy converter of monitoring and protection unit Real-Time Monitoring, utilize different control strategies, system grid connection and isolated island two kinds of operational modes are realized by controlling grid-connected AC/DC, distributed generation unit and the mutual cooperation of energy-storage units is realized by control energy storage DC/DC, photovoltaic DC/DC, wind-force AC/DC, improve power supply reliability, ensure that important load runs without interruption;
The diesel engine generator of generator unit is connected with ac bus, diesel engine generator is as AC safety watl power supply, its all can not meet loading demand at bulk power grid, photovoltaic generating system, wind generator system and energy-storage units discharges into a certain degree time start, meet important load and power for a long time;
Wind generator system in present system and photovoltaic generating system utilize clean reproducible energy to generate electricity, and plays the effect of energy-conserving and environment-protective, alleviates the dual-pressure of the energy and environment;
Energy-storage units in present system is batteries, meets system capacity balance, maintain DC bus-bar voltage constant by the charging and discharging of batteries;
Grid-connected AC/DC in present system is two-way AC/DC converter, and adopt three phase full bridge topological structure, its AC is connected with bulk power grid, and DC side is connected with DC bus; And net state under, grid-connected AC/DC normally works, and realizes the energy in bidirectional flow between bulk power grid and other generator units; Under island state, grid-connected AC/DC is in holding state;
Energy storage DC/DC in present system, adopt full-bridge topologies, its side is connected with energy-storage units, and opposite side is connected with DC bus, for controlling the discharge and recharge of energy-storage units; Energy storage DC/DC is operated in charge or discharge state in the mode of constant current voltage limiting, and the energy keeping energy-storage units to store as far as possible can meet when bulk power grid, photovoltaic generating system, wind generator system all can not meet loading demand, the short time meeting important load powers;
Photovoltaic DC/DC in present system, adopt Boost topological structure, its side is connected with photovoltaic generating system, and opposite side is connected with DC bus, following the tracks of (MPPT), improving solar energy utilization ratio for realizing maximum power point of photovoltaic power generation system;
Wind-force AC/DC in present system, adopt Boost topological structure, its side is connected with wind generator system, opposite side is connected with DC bus, alternating current for being sent by blower fan converts direct current to, reduce the grid-connected difficulty of wind generator system, realize wind generator system MPPT maximum power point tracking simultaneously, improve wind energy utilization; And net state under, photovoltaic DC/DC and wind-force DC/DC all adopts conductance increment method to be operated in MPPT pattern; Under island state, when the generating gross power of photovoltaic generating system and wind generator system is less than load gross power, be operated in MPPT pattern, when the generating gross power of photovoltaic generating system and wind generator system is greater than load gross power and energy-storage units is in full state, exit MPPT pattern, enter constant voltage mode, prevent significantly lifting bus voltage.
The control strategy of monitoring and protection unit executive system, optimizes the operation of alternating current-direct current mixing micro-grid system: grid-connected AC/DC commutation inversion switching value is nominal DC bus voltage value; Nominal DC busbar voltage: 480 ~ 500V; Voltage: 540V when energy-storage units is in full state; DC bus maximum allowable voltage: 510 ~ 520V (be 520V according to the ceiling voltage determination DC bus-bar voltage maximum that load can bear); Energy-storage units voltage first set point is 450 ~ 460V; Energy-storage units voltage second set point is 400 ~ 410V; The running status of 5 generator units is determined by d-c bus voltage value:
When photovoltaic generation and wind power generation summation are greater than bearing power and energy storage charge requirement, DC bus-bar voltage rises, be greater than specified bus voltage value 500V, system grid connection is run, grid-connected AC/DC is in inverter mode, energy flows to bulk power grid by DC bus, photovoltaic DC/DC and wind-force DC/DC is in MPPT pattern, if energy-storage units is in underfill state and energy-storage units voltage when being less than 540V, energy storage DC/DC is in charged state, when energy-storage units is full of electricity and energy-storage units voltage is 540V, energy storage DC/DC is in stopped status, grid-connected AC/DC maintains busbar voltage at rated value 500V,
When photovoltaic generation and wind power generation summation are less than bearing power and energy storage charge requirement, DC bus-bar voltage reduces, be less than specified bus voltage value 500V, system grid connection is run, grid-connected AC/DC is in rectification state, energy flows to DC bus by bulk power grid, photovoltaic DC/DC and wind-force DC/DC is in MPPT pattern, if energy-storage units is in underfill state and energy-storage units voltage when being less than 540V, energy storage DC/DC is in charged state, when energy-storage units is full of electricity and energy-storage units voltage is 540V, energy storage DC/DC is in stopped status, grid-connected AC/DC maintains busbar voltage at rated value 500V,
When photovoltaic generation and wind power generation summation be greater than bearing power and energy-storage units be in underfill state and energy-storage units voltage be less than 540V time, system islet operation, photovoltaic DC/DC and wind-force DC/DC is in MPPT pattern, energy storage DC/DC is in charged state, when energy-storage units is full of electricity and energy-storage units voltage is 540V, energy storage DC/DC is in stopped status, because generated output is greater than bearing power, busbar voltage rises to maximum permissible value 520V, photovoltaic DC/DC and wind-force DC/DC is converted to constant voltage mode, and stable DC busbar voltage is in maximum;
Under islet operation pattern, when photovoltaic generation and wind power generation summation are less than bearing power, DC bus-bar voltage reduces, within the switching time of 200us, energy storage DC/DC with lower than nominal DC bus voltage value to load discharge, when energy-storage units magnitude of voltage is lower than the first set point 460V, for ensureing that important load runs without interruption, the load of excision insignificant; Energy-storage units continues electric discharge, and when energy-storage units magnitude of voltage is lower than the second set point 400V, start diesel generating system, the alternating current of diesel generating system stable output in 1min, important load switches to ac bus and powers, and ensures that important load runs without interruption.
Table 1 be present system under different conditions, each generator unit running status:
Table 1
Above-mentioned execution mode is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (7)

1. an alternating current-direct current mixing micro-grid system, is characterized in that: comprising multiple generator unit, load and the distribution line for being connected with load by generator unit, also comprising monitoring and protection unit; Described generator unit comprises bulk power grid and grid-connected AC/DC converter, energy-storage system and DC/DC converter thereof, wind generator system and AC/DC converter, photovoltaic generating system and DC/DC converter thereof and diesel engine generator; Described load comprises the load of interchange insignificant, exchanges important load, alternating current-direct current load, direct current important load and the load of direct current insignificant; Described distribution line comprises DC power distribution line and AC power distribution line;
Wherein, described grid-connected AC/DC converter AC is connected with bulk power grid, and DC side is connected with DC bus; Described energy storage DC/DC converter side is connected with energy-storage units, and opposite side is connected with DC bus; Described wind-force AC/DC converter side is connected with wind generator system, and opposite side is connected with DC bus; Described photovoltaic DC/DC converter side is connected with photovoltaic generating system, and opposite side is connected with DC bus;
The load of described interchange insignificant is connected with ac bus by DC/AC converter; Described interchange important load is connected with ac bus and is connected with DC bus by DC/AC converter simultaneously; Described alternating current-direct current load is connected with ac bus and is connected with DC bus by DC/DC converter simultaneously; Described direct current important load is connected with DC bus by DC/DC converter and is connected with ac bus by AC/DC converter simultaneously; The load of described direct current insignificant is connected with DC bus by DC/DC converter;
Described monitoring and protection unit is communicated by CAN and described grid-connected AC/DC converter, energy storage DC/DC converter, wind-force AC/DC converter, photovoltaic DC/DC converter and the DC/AC converter be connected with described interchange important load, the DC/DC converter be connected with described alternating current-direct current load, the DC/DC converter be connected with described direct current important load, the AC/DC converter be connected with described direct current important load, the DC/DC converter that is connected with the load of described direct current insignificant;
Described diesel engine generator is connected with ac bus.
2. alternating current-direct current mixing micro-grid system according to claim 1, is characterized in that: described grid-connected AC/DC converter is two-way AC/DC converter, adopts three phase full bridge topological structure.
3. alternating current-direct current mixing micro-grid system according to claim 1, is characterized in that: described energy storage DC/DC converter adopts full-bridge topologies.
4. alternating current-direct current mixing micro-grid system according to claim 1, is characterized in that: described photovoltaic DC/DC converter adopts Boost topological structure.
5. alternating current-direct current mixing micro-grid system according to claim 1, is characterized in that: described wind-force AC/DC converter adopts Boost topological structure.
6. a control strategy for alternating current-direct current mixing micro-grid system described in claim 1, is characterized in that:
The running status of each generator unit of described alternating current-direct current mixing micro-capacitance sensor is determined by d-c bus voltage value;
When photovoltaic generation and wind power generation summation are greater than bearing power, DC bus-bar voltage raises, when DC bus-bar voltage higher than grid-connected AC/DC converter commutation inversion switching value and energy-storage units is in full state time, whole system is in the pattern of being incorporated into the power networks, in order to preferentially utilize photovoltaic and wind energy, setting grid-connected AC/DC converter commutation inversion switching value is nominal DC bus voltage value, grid-connected AC/DC converter is in inverter mode, energy storage DC/DC converter is in stopped status, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern;
When photovoltaic generation and wind power generation summation are greater than bearing power, DC bus-bar voltage raises, when DC bus-bar voltage higher than grid-connected AC/DC converter commutation inversion switching value and energy-storage units is in underfill state time, whole system is in islet operation pattern, grid-connected AC/DC converter is in stopped status, energy storage DC/DC converter charges in constant current voltage limiting mode, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern;
When photovoltaic generation and wind power generation summation are greater than bearing power, and system is when being in islet operation pattern, grid-connected AC/DC converter is in stopped status, if energy-storage units is in underfill state, energy storage DC/DC converter charges in constant current voltage limiting mode, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern; If energy-storage units is in full state, energy storage DC/DC converter is in stopped status, and photovoltaic DC/DC converter and wind-force DC/DC converter are in constant voltage mode, and DC bus-bar voltage raises, until the maximum that the system that is stabilized in allows;
When photovoltaic generation and wind power generation summation are less than bearing power, DC bus-bar voltage declines, when DC bus-bar voltage is lower than grid-connected AC/DC converter commutation inversion switching value, system is in the pattern of being incorporated into the power networks, in order to preferentially utilize photovoltaic and wind energy, setting grid-connected AC/DC converter commutation inversion switching value is nominal DC bus voltage value, grid-connected AC/DC converter is in rectification state, if energy-storage units is in full state, energy storage DC/DC converter is shut down, otherwise energy storage DC/DC converter charges in constant current voltage limiting mode, photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern,
When photovoltaic generation and wind power generation summation are less than bearing power, DC bus-bar voltage reduces, system is in islet operation pattern, if now energy storage DC/DC converter is with the discharge threshold stable DC busbar voltage lower than nominal DC bus voltage value, grid-connected AC/DC converter is in stopped status, energy storage DC/DC converter discharges, and photovoltaic DC/DC converter and wind-force DC/DC converter are in MPPT pattern;
When photovoltaic generation and wind power generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units magnitude of voltage lower than the first set point time, be ensure that important load runs without interruption, excision insignificant load;
When photovoltaic generation and wind power generation summation are less than bearing power, system is in islet operation pattern, and energy-storage units magnitude of voltage lower than the second set point time, start diesel generating system, important load is powered by ac bus, ensure important load run without interruption.
7. the control strategy of alternating current-direct current mixing micro-capacitance sensor as claimed in claim 6, is characterized in that: described nominal DC busbar voltage is 480 ~ 500V; When described energy-storage units is in full state, voltage is 540V; Described DC bus maximum allowable voltage is 510 ~ 520V; Described energy-storage units voltage first set point is 450 ~ 460V; Described energy-storage units voltage second set point is 400 ~ 410V.
CN201510001858.4A 2015-01-04 2015-01-04 Alternating current and direct current hybrid micro-grid system and control strategy thereof CN104505867B (en)

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