CN103872701A - Energy-storage type alternating current and direct current mixed micro-grid and control method thereof - Google Patents
Energy-storage type alternating current and direct current mixed micro-grid and control method thereof Download PDFInfo
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Abstract
The invention discloses an energy-storage type alternating current and direct current mixed micro-grid and a control method thereof. The energy-storage type alternating current and direct current mixed micro-grid comprises an alternating current micro-grid, a direct current micro-grid, a battery energy-storage system and an energy management system EMS, which are connected with an external grid control center. The control method of the energy-storage type alternating current and direct current mixed micro-grid comprises the following steps of initializing the EMS to acquire information data of the alternating current micro-grid, the direct current micro-grid and the battery energy-storage system; acquiring information data of an external public grid in real time; regulating and controlling the alternating current micro-grid, the direct current micro-grid and the battery energy-storage system according to the acquired data. The energy-storage type alternating current and direct current mixed micro-grid and the control method thereof have the advantages that the energy utilization efficiency can be improved, the size of a transformer can be reduced, networking and controlling are more flexible, the cost is reduced, and the power supply reliability of the whole system is improved.
Description
Technical field
The present invention relates to a kind of accumulation energy type alternating current-direct current mixing microgrid and control method thereof.
Background technology
At present, no matter be in large-scale electric power system or other micro-grid system, be mainly the single micro-grid system that exchanges microgrid or direct current microgrid.For single micro-grid system, there is this many-sided deficiency: increasing power consumption equipment needs direct current supply, be converted to compared with direct current is converted to direct current with direct current by AC network, not only converter apparatus volume is large, cost is high, and it is low to exchange conversion efficiency, and energy loss is serious; Single interchange or direct current microgrid, power converter is many, and volume is large, and system power supply reliability is low; Simultaneously along with the pay attention to day by day to energy-conserving and environment-protective, all DC power outputs such as distributed solar generating, elevator energy-saving energy-recuperation system, need to facilitate the flexible access of regenerative resource; Most micro-grid system control and management are simple in addition, do not have a set of effective energy control method to take into full account the efficiency of energy utilization of system.
Summary of the invention
In order to address the above problem, the invention provides the design of a kind of accumulation energy type alternating current-direct current mixing microgrid and control method thereof.
A kind of accumulation energy type alternating current-direct current mixing microgrid, comprise and exchange microgrid, direct current microgrid and battery energy storage system, also comprise the EMS EMS being connected with interchange microgrid, direct current microgrid and battery energy storage system, exchange microgrid and be connected by one or more two-way DC/AC converters with direct current microgrid, exchange microgrid and be connected with battery energy storage system with one or more two-way DC/DC converters by one or more two-way AC/DC converters respectively with direct current microgrid; Described EMS EMS is also connected with external electrical network control centre.
Described interchange microgrid comprises ac bus, is connected to ac bus for the one or more two-way AC/AC converter that is connected with outside public electric wire net, for the one or more two-way AC/DC converter of external electric equipment (being equivalent to electric automobile and AC load etc.) row energy exchange, for being connected one or more AC/AC converters of other alternating current power-generating systems.
Described direct current microgrid comprises DC bus, is connected to DC bus for connecting one or more DC/DC converters of other DC power generation system, for connecting external electric equipment one or more two-way DC/DC converter and one or more DC/DC converter of (being equivalent to electric automobile and straight load etc.).
EMS EMS comprises main control unit, the direct current microgrid monitoring unit being connected with direct current microgrid, the interchange microgrid monitoring unit being connected with interchange microgrid and the battery management unit being connected with battery energy storage system; Described direct current microgrid monitoring unit, interchange microgrid monitoring unit and battery management unit are all connected with main control unit.Described direct current microgrid monitoring unit is connected with each converter that exchanges microgrid with direct current microgrid respectively by communication bus with interchange microgrid monitoring unit; Described interchange microgrid monitoring unit connects with each converter that is connected interchange microgrid and direct current microgrid; Described battery management unit by one or more two-way DC/DC converters and one or more two-way AC/DC converter respectively at direct current microgrid with exchange microgrid and be connected.
Described direct current microgrid monitoring unit is connected with each converter that exchanges microgrid with direct current microgrid respectively by communication bus with interchange microgrid monitoring unit; Described interchange microgrid monitoring unit connects with each converter that is connected interchange microgrid and direct current microgrid.
A control method for accumulation energy type alternating current-direct current mixing microgrid, comprises the following steps: (1) EMS EMS initialization; (2) EMS EMS obtains and exchanges that microgrid, direct current microgrid are sent out and the information data of battery energy storage system energy-storage system of accumulator; (3) information data of the outside public electric wire net of EMS EMS Real-time Obtaining; (4) according to the above-mentioned data that get carry out to exchange microgrid, direct current microgrid sends out and battery energy storage system regulates and controls.
The described information data of step (2) comprises: the load condition that (I) exchanges microgrid, direct current microgrid, battery energy storage system and outside public electric wire net; (II) generated output of electricity generation system in interchange microgrid, direct current microgrid, battery energy storage system current residual power.The described information data of step (3) comprises: outside public electric wire net load prediction curve, the electricity generation system generated power forecasting curve in charging electric vehicle prediction curve and alternating current-direct current microgrid.
The described method that exchanges microgrid, direct current microgrid, battery energy storage system and outside public electric wire net load condition of obtaining is: by the flow direction that obtains current host node power and the size of the two-way AC/AC converter that is connected with outside public electric wire net; Exchange each two-way AC/ DC converter of microgrid and direct current microgrid, each the two-way AC/DC converter that is connected external electric equipment and the data of each two-way DC/DC converter of external electric equipment by connection, and according to exchanging microgrid from the permanent power control of node principle:
, with direct current microgrid from the permanent power control of node principle:
calculate energy flow direction and the size of current interchange microgrid, direct current microgrid and battery energy storage system; Wherein
for DC load,
for AC load,
for DC power generation system is sent power,
for alternating current power-generating system sends power,
for electrical network provides power,
for the power of storing in battery storage system,
for electric vehicle battery system power demand.
The method of described step (4) is: (41) EMS EMS is according to each prediction curve, and judging whether need to be by outside rich electric energy feedback public electric wire net; (42) EMS EMS, obtains best power path according to load by efficiency optimization algorithm, and distributes combination according to the combination of each converter of best power route adjust and load.
Step (41) judges whether: can the power that calculate DC power generation system in following unit interval according to each prediction data expire the energy storage requirement of battery energy storage system, if meet by send dependent instruction to relevant two-way AC/DC converter by the unnecessary electric energy feedback that exchanges microgrid to external public network; If the power of DC power generation system can not meet the energy storage requirement of battery energy storage system in the following unit interval, and in following alternating current-direct current microgrid, there is larger loading demand, will exchange the unnecessary electrical power storage of microgrid by sending dependent instruction in battery system to relevant two-way AC/DC converter.
Described step (42) is further comprising the steps of: (42a) in the time that EMS EMS detects that direct current microgrid bearing power is greater than the generated output of DC generation equipment in direct current microgrid, EMS EMS is according to best power path target function:
calculate rational power path.
(42b) when EMS EMS detects that exchanging microgrid bearing power is greater than the generated output that exchanges AC power generating apparatus in microgrid, and when in direct current microgrid, DC generation power is less than in direct current microgrid DC load power, EMS EMS is according to best power path target function:
(42c) when EMS EMS detects that exchanging microgrid bearing power is greater than the generated output that exchanges AC power generating apparatus in microgrid, and when in direct current microgrid, DC generation power is greater than in direct current microgrid DC load power, EMS EMS is according to best power path target function:
Wherein,
for two-way DC/AC converter forward conversion efficiency function,
for two-way DC/AC converter reverse transformation efficiency function,
for two-way AC/DC converter forward conversion efficiency function,
for AC/DC DC converter reverse transformation efficiency function,
for two-way DC/DC converter forward conversion efficiency function,
for two-way DC/DC converter reverse transformation efficiency function,
for two-way AC/AC converter forward conversion efficiency function,
for two-way AC/AC converter reverse transformation efficiency function,
for unidirectional AC/AC transducer effciency function,
for unidirectional DC/DC transducer effciency function.
In sum, the present invention has following beneficial effect: (1) modularization by each converter, can flexible access load and generator unit, minimizing exchange conversion is DC environment, promote efficiency of energy utilization, reduce the volume of converter, meanwhile, reduce reactive-load compensation equipment and drop into, save cost; (2) alternating current-direct current microgrid adopts distributed management, and the control efficiency of elevator system greatly makes to control more flexible; (3) alternating current-direct current microgrid adopts alternating current-direct current hybrid power supply, adds battery energy storage system, promotes the reliability of whole system power supply; And the interaction of outside public electric wire net real time communication (4), carry out when being necessary stored energy and output, can play the effect of outside public electric wire net peak load shifting, the whole electrical network of balance is played to positive role, improve utilization ratio, reduce electric cost; (5) networking flexibility, from little to single building greatly to block supply, can quickly networking.
Brief description of the drawings
Fig. 1 is the overall structure schematic diagram of a kind of accumulation energy type alternating current-direct current mixing microgrid of the present invention.
Embodiment
In order to allow those skilled in the art can understand better technical scheme of the present invention, below in conjunction with accompanying drawing, the invention will be further elaborated.
As shown in Figure 1, the present invention has disclosed a kind of accumulation energy type alternating current-direct current mixing microgrid, comprise and exchange microgrid, direct current microgrid and battery energy storage system, also comprise the EMS EMS being connected with interchange microgrid, direct current microgrid and battery energy storage system, exchange microgrid and be connected by one or more two-way DC/AC converters with direct current microgrid, realize energy exchange.
Exchange microgrid and be connected with battery energy storage system with one or more two-way DC/DC converters by one or more two-way AC/DC converters respectively with direct current microgrid, can discharge and recharge battery energy storage system; EMS EMS is also connected with external electrical network control centre.
Exchange microgrid and comprise ac bus (AC BUS), be connected to ac bus for the one or more two-way AC/AC converter that is connected with outside public electric wire net, for carrying out the one or more two-way AC/DC converter of energy exchange with external electric equipment, for being connected one or more AC/AC converters of other alternating current power-generating systems.Electricity generation system can be as the alternating current power-generating system such as hydro power generation, wind power generation.
Direct current microgrid comprises DC bus (DC BUS), be connected to DC bus for connecting one or more DC/DC converters of other DC power generation system (as photovoltaic generating system), for connecting one or more two-way DC/DC converter and one or more DC/DC converter of external electric equipment (as outside load appliance, electric automobile discharges and recharges interface and corollary equipment etc. thereof).
EMS EMS comprises main control unit, the direct current microgrid monitoring unit that is connected with direct current microgrid, with the battery management unit for responsible Real-time Collection battery information information such as () voltage, electric current, temperature, SOC that exchanges the interchange microgrid monitoring unit that microgrid is connected and be connected with battery energy storage system; Described direct current microgrid monitoring unit, interchange microgrid monitoring unit and battery management unit are all connected with main control unit.Described direct current microgrid monitoring unit is connected with each converter that exchanges microgrid with direct current microgrid respectively by communication bus with interchange microgrid monitoring unit; Described interchange microgrid monitoring unit connects with each converter that is connected interchange microgrid and direct current microgrid.Described direct current microgrid monitoring unit is connected with each converter that exchanges microgrid with direct current microgrid respectively by communication bus with interchange microgrid monitoring unit; Described interchange microgrid monitoring unit connects with each converter that is connected interchange microgrid and direct current microgrid.Direct current microgrid monitoring unit, exchange microgrid monitoring unit and battery management unit is all realized by communication bus and data and the information exchange of other nodes (node comprises each converter), and by wired or wireless network and electrical network center to center communications, realize information transmission.EMS EMS also can be connected with external electrical network control centre by wired or wireless mode, submits or obtain relevant data to, as outside public electric wire net load prediction curve etc.
The present invention has also disclosed a kind of accumulation energy type alternating current-direct current mixing microgrid control method, comprises the following steps.
(1) EMS EMS initialization.
(2) EMS EMS obtains and exchanges that microgrid, direct current microgrid are sent out and the information data of battery energy storage system energy-storage system of accumulator; Comprise: the load condition that exchanges microgrid, direct current microgrid, battery energy storage system and outside public electric wire net; Exchange the generated output of electricity generation system in microgrid, direct current microgrid, battery energy storage system current residual power.
Obtaining the method that exchanges microgrid, direct current microgrid, battery energy storage system and outside public electric wire net load condition is: by the flow direction that obtains current host node power and the size of the two-way AC/AC converter that is connected with outside public electric wire net; Exchange each two-way AC/ DC converter of microgrid and direct current microgrid, each the two-way AC/DC converter that is connected external electric equipment and the data of each two-way DC/DC converter of external electric equipment by connection, and according to exchanging microgrid from the permanent power control of node principle:
, with direct current microgrid from the permanent power control of node principle:
calculate energy flow direction and the size of current interchange microgrid, direct current microgrid and battery energy storage system; Wherein
for DC load,
for AC load,
for DC power generation system is sent power,
for alternating current power-generating system sends power,
for electrical network provides power,
for the power of storing in battery storage system,
for electric vehicle battery system power demand.
(3) EMS EMS real-time (from external electrical network control centre) obtains the information data of outside public electric wire net, comprise: outside public electric wire net load prediction curve, and according to historical statistical data, the electricity generation system generated power forecasting curve in real-time query charging electric vehicle prediction curve and alternating current-direct current microgrid.
(4) according to the above-mentioned data that get carry out to exchange microgrid, direct current microgrid sends out and battery energy storage system regulates and controls.EMS EMS is according to each prediction curve, and judging whether need to be by outside rich electric energy feedback public electric wire net; EMS EMS, obtains best power path according to load by efficiency optimization algorithm, and distributes combination according to the combination of each converter of best power route adjust and load.
Judge whether to be by the method for the outside public electric wire net of rich electric energy feedback: can the power that calculate DC power generation system in following unit interval according to each prediction data expire the energy storage requirement of battery energy storage system, if meet by send dependent instruction to relevant two-way AC/DC converter by the unnecessary electric energy feedback that exchanges microgrid to external public network; If the power of DC power generation system can not meet the energy storage requirement of battery energy storage system in the following unit interval, and in following alternating current-direct current microgrid, there is larger loading demand, will exchange the unnecessary electrical power storage of microgrid by sending dependent instruction in battery system to relevant two-way AC/DC converter.
(42a), in the time that EMS EMS detects that direct current microgrid bearing power is greater than the generated output of DC generation equipment in direct current microgrid, EMS EMS is according to best power path target function:
(42b) when EMS EMS detects that exchanging microgrid bearing power is greater than the generated output that exchanges AC power generating apparatus in microgrid, and when in direct current microgrid, DC generation power is less than in direct current microgrid DC load power, EMS EMS is according to best power path target function:
(42c) when EMS EMS detects that exchanging microgrid bearing power is greater than the generated output that exchanges AC power generating apparatus in microgrid, and when in direct current microgrid, DC generation power is greater than in direct current microgrid DC load power, EMS EMS is according to best power path target function:
Wherein,
for two-way DC/AC converter forward conversion efficiency function,
for two-way DC/AC converter reverse transformation efficiency function,
for two-way AC/DC converter forward conversion efficiency function,
for AC/DC DC converter reverse transformation efficiency function,
for two-way DC/DC converter forward conversion efficiency function,
for two-way DC/DC converter reverse transformation efficiency function,
for two-way AC/AC converter forward conversion efficiency function,
for two-way AC/AC converter reverse transformation efficiency function,
for unidirectional AC/AC transducer effciency function,
for unidirectional DC/DC transducer effciency function.
The present embodiment is more excellent execution mode of the present invention, and the part not being described in detail all adopts known mature technology.It should be noted that; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. an accumulation energy type alternating current-direct current mixing microgrid, comprise and exchange microgrid, direct current microgrid and battery energy storage system, it is characterized in that, also comprise the EMS EMS being connected with interchange microgrid, direct current microgrid and battery energy storage system, exchange microgrid and be connected by one or more two-way DC/AC converters with direct current microgrid, exchange microgrid and be connected with battery energy storage system with one or more two-way DC/DC converters by one or more two-way AC/DC converters respectively with direct current microgrid; Described EMS EMS is also connected with external electrical network control centre.
2. accumulation energy type alternating current-direct current mixing microgrid according to claim 1, it is characterized in that: described interchange microgrid comprises ac bus, be connected to ac bus for the one or more two-way AC/AC converter that is connected with outside public electric wire net, for carrying out the one or more two-way AC/DC converter of energy exchange with external electric equipment, for being connected one or more AC/AC converters of other alternating current power-generating systems.
3. accumulation energy type alternating current-direct current mixing microgrid according to claim 2, it is characterized in that: described direct current microgrid comprises DC bus, be connected to DC bus for connecting one or more DC/DC converters of other DC power generation system, for connecting the one or more two-way DC/DC converters of external electric equipment and one or more DC/DC converter.
4. accumulation energy type alternating current-direct current mixing microgrid according to claim 3, it is characterized in that: EMS EMS comprises main control unit the direct current microgrid monitoring unit being connected with direct current microgrid, the interchange microgrid monitoring unit being connected with interchange microgrid and the battery management unit being connected with battery energy storage system; Described direct current microgrid monitoring unit, interchange microgrid monitoring unit and battery management unit are all connected with main control unit;
Described direct current microgrid monitoring unit is connected with each converter that exchanges microgrid with direct current microgrid respectively by communication bus with interchange microgrid monitoring unit;
Described interchange microgrid monitoring unit connects with each converter that is connected interchange microgrid and direct current microgrid;
Described battery management unit by one or more two-way DC/DC converters and one or more two-way AC/DC converter respectively at direct current microgrid with exchange microgrid and be connected.
5. a control method for accumulation energy type alternating current-direct current mixing microgrid, is characterized in that, comprises the following steps:
(1) EMS EMS initialization;
(2) EMS EMS obtains and exchanges that microgrid, direct current microgrid are sent out and the information data of battery energy storage system energy-storage system of accumulator;
(3) information data of the outside public electric wire net of EMS EMS Real-time Obtaining;
(4) according to the above-mentioned data that get carry out to exchange microgrid, direct current microgrid sends out and battery energy storage system regulates and controls.
6. the control method of a kind of accumulation energy type alternating current-direct current mixing microgrid according to claim 5, is characterized in that, the described information data of step (2) comprises:
(I) load condition of interchange microgrid, direct current microgrid, battery energy storage system and outside public electric wire net;
(II) generated output of electricity generation system in interchange microgrid, direct current microgrid, battery energy storage system current residual power; The described information data of step (3) comprises: outside public electric wire net load prediction curve, the electricity generation system generated power forecasting curve in charging electric vehicle prediction curve and alternating current-direct current microgrid.
7. the control method of a kind of accumulation energy type alternating current-direct current mixing microgrid according to claim 6, it is characterized in that, described in obtain the method that exchanges microgrid, direct current microgrid, battery energy storage system and outside public electric wire net load condition and be: by the flow direction that obtains current host node power and the size of the two-way AC/AC converter that is connected with outside public electric wire net;
Exchange each two-way AC/ DC converter of microgrid and direct current microgrid, each the two-way AC/DC converter that is connected external electric equipment and the data of each two-way DC/DC converter of external electric equipment by connection, and according to exchanging microgrid from the permanent power control of node principle:
, with direct current microgrid from the permanent power control of node principle:
calculate energy flow direction and the size of current interchange microgrid, direct current microgrid and battery energy storage system;
Wherein
for DC load,
for AC load,
for DC power generation system is sent power,
for alternating current power-generating system sends power,
for electrical network provides power,
for the power of storing in battery storage system,
for electric vehicle battery system power demand.
8. the control method of a kind of accumulation energy type alternating current-direct current mixing microgrid according to claim 7, is characterized in that, the method for described step (4) is:
(41) EMS EMS is according to each prediction curve, and judging whether need to be by outside rich electric energy feedback public electric wire net;
(42) EMS EMS, obtains best power path according to load by efficiency optimization algorithm, and distributes combination according to the combination of each converter of best power route adjust and load.
9. the control method of a kind of accumulation energy type alternating current-direct current mixing microgrid according to claim 8, it is characterized in that, step (41) judges whether: can the power that calculate DC power generation system in following unit interval according to each prediction data expire the energy storage requirement of battery energy storage system, if meet by send dependent instruction to relevant two-way AC/DC converter by the unnecessary electric energy feedback that exchanges microgrid to external public network; If the power of DC power generation system can not meet the energy storage requirement of battery energy storage system in the following unit interval, and in following alternating current-direct current microgrid, there is larger loading demand, will exchange the unnecessary electrical power storage of microgrid by sending dependent instruction in battery system to relevant two-way AC/DC converter.
10. a kind of accumulation energy type alternating current-direct current mixing microgrid control method according to claim 9, is characterized in that, described step (42) is further comprising the steps of:
(42a), in the time that EMS EMS detects that direct current microgrid bearing power is greater than the generated output of DC generation equipment in direct current microgrid, EMS EMS is according to best power path target function:
(42b) when EMS EMS detects that exchanging microgrid bearing power is greater than the generated output that exchanges AC power generating apparatus in microgrid, and when in direct current microgrid, DC generation power is less than in direct current microgrid DC load power, EMS EMS is according to best power path target function:
(42c) when EMS EMS detects that exchanging microgrid bearing power is greater than the generated output that exchanges AC power generating apparatus in microgrid, and when in direct current microgrid, DC generation power is greater than in direct current microgrid DC load power, EMS EMS is according to best power path target function:
Wherein,
for two-way DC/AC converter forward conversion efficiency function,
for two-way DC/AC converter reverse transformation efficiency function,
for two-way AC/DC converter forward conversion efficiency function,
for AC/DC DC converter reverse transformation efficiency function,
for two-way DC/DC converter forward conversion efficiency function,
for two-way DC/DC converter reverse transformation efficiency function,
for two-way AC/AC converter forward conversion efficiency function,
for two-way AC/AC converter reverse transformation efficiency function,
for unidirectional AC/AC transducer effciency function,
for unidirectional DC/DC transducer effciency function.
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