CN103457514A - Dual-mode solar photovoltaic power generation system - Google Patents
Dual-mode solar photovoltaic power generation system Download PDFInfo
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Abstract
The invention provides a dual-mode solar photovoltaic power generation system which is composed of four parts, namely a distribution type photovoltaic power generation subsystem, an energy storage subsystem, a load and an integrated management subsystem. According to the dual-mode solar photovoltaic power generation system, the energy storage subsystem is used as an energy buffering common platform, the integrated management subsystem is used as an integrated management platform, and therefore unified optimization objectives of power generation with maximal efficiency, operation with maximal economic benefit and securitization of demand responses are achieved for distribution type solar photovoltaic power generation.
Description
Technical field
The present invention relates to a kind of bimodulus solar photovoltaic generation system, especially relate to a kind of bimodulus solar photovoltaic generation system of building the distributed roof photovoltaic power station on the building of city, garden, community etc. that is mainly used in.
Background technology
The renewable energy power generations such as solar power generation, wind power generation, tidal power, for solving energy crisis and the problem of environmental pollution of human society growing tension, provide an alternative solution thinking and way.Ether energy photovoltaic generation is example, along with the expanding day of the scale of whole world installation in recent years, is just becoming the important technical of renewable energy utilization.
Solar energy power generating can simply be divided into two kinds of modes, a kind of is centralized solar photovoltaic power plant, by building tens megawatts concentrated in flakes and even the large solar photovoltaic power station of hundreds of mw scale, convert solar energy acquisition to electric energy, through conveying and the allotment of excessive electrical network, offer the user and use.Centralized solar photovoltaic power plant, because solar power generation has intermittence and instable characteristics, often cause great impact to electrical network, and the safety of electrical network is caused to adverse effect; And centralized production of energy method, still do not break away from the production and application pattern of traditional electric energy, cause a large amount of valuable electric energy to produce a large amount of irreversible loss in the course of conveying of multistage conversion and long distance.Also having a kind of is distributed solar photovoltaic power plant, and scale does not wait several megawatts and even several kilowatts, the general construction at building roof or near user's ground etc.Distributed solar photovoltaic power plant, near user's side, do not need the High Pressure Difference conversion and carry, and the middle loss of process has reduced, and the utilization ratio of new forms of energy is improved.But, due to solar power generation remain gap with unsettled, may cause adverse effect to user's the quality of power supply; And send out i.e. use, can not demand response; When occurring in the electric network fault situation, distributed solar photovoltaic power plant also must be out of service, can not reach the target autonomous from net.
In existing technical scheme, the general employing by the mode of configuration energy-storage system, by the distributed solar energy photovoltaic generating system, turn the integrated system of a distributed solar energy power generating and energy storage integrated into, to solve the unsettled problem of new forms of energy, can solve again the problem autonomous from net.But, because needs configure fairly large energy-storage system, cause cost to rise.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the above-mentioned defect that prior art exists, and provides a kind of energy utilization rate high, the bimodulus solar photovoltaic generation system of working stability.
The technical solution adopted for the present invention to solve the technical problems is: the bimodulus solar photovoltaic generation system is comprised of distributed photovoltaic power generation subsystem, energy storage subsystem, load, four parts of integrated management subsystem;
Described distributed photovoltaic power generation subsystem comprises solar battery array, DC power distribution cabinet, photovoltaic DC-to-AC converter, solar battery array is electrically connected to DC power distribution cabinet, DC power distribution cabinet is electrically connected to photovoltaic DC-to-AC converter by K switch 1, photovoltaic DC-to-AC converter is electrically connected to AC power distribution cabinet/AC distribution panel by K switch 2, and AC power distribution cabinet/AC distribution panel is by the external civil power of K switch 0; The distributed photovoltaic power generation subsystem mainly realizes that gathering solar energy changes direct current energy into, and further is converted to AC energy.
Described load is as using the energy part, comprise a type load (as emergency light) of interruptible load not and two type loads (as air-conditioning) that can interruption of power supply, AC power distribution cabinet/AC distribution panel is electrically connected to two type loads by K switch 4, K switch 7, and AC power distribution cabinet/AC distribution panel is electrically connected to a type load by K switch 4, K switch 8;
Described energy storage subsystem comprises battery pile and bidirectional energy-storage inverter, and battery pile is electrically connected to the bidirectional energy-storage inverter is two-way by K switch 5, and the bidirectional energy-storage inverter is electrically connected to AC power distribution cabinet/AC distribution panel is two-way by K switch 6; The energy storage subsystem is as the buffer platform of energy and power, for storing the solar energy electric weight, further be fed to the electrical network utilization by the bidirectional energy-storage inverter, in support by a part of electric flux simultaneously, civil power break down can not electric power thus supplied under, discharge to a type load emergency service.
The integrated management subsystem is implemented the management of whole bimodulus solar photovoltaic generation system is controlled, and command system is operated under each pattern, realizes the functions such as energy acquisition, production, conversion, emergency service, energy storage management subsystem, stored energy release.
Described integrated management subsystem comprises the civil power monitoring modular, the new forms of energy monitoring modular, the BMS monitoring modular, the step price database, load monitoring module and mode of operation decision-making module, the civil power monitoring modular, the new forms of energy monitoring modular, the BMS monitoring modular, step price database and load monitoring module all are electrically connected to the mode of operation decision-making module is two-way, the new forms of energy monitoring modular is connected with the two-way electricity of distributed photovoltaic power generation subsystem, the BMS monitoring modular is connected with the two-way electricity of energy storage subsystem, the load monitoring module is connected with the two-way electricity of load, the civil power monitoring modular is electrically connected to AC power distribution cabinet/AC distribution panel is two-way.
The civil power monitoring modular, mainly monitor the quality of power supply relevant information such as voltage, electric current, power, power factor (PF) of civil power.The BMS monitoring modular, mainly monitor voltage, electric current, temperature, the SOC(charged state of energy storage subsystem), the SOH(health status) etc. information.The step price database is stored current step price data.The load monitoring module, the use energy situation of monitoring load, realize the excision of a non-type load under case of emergency.The new forms of energy monitoring modular is mainly monitored the information such as the input voltage, input current, input power, output voltage, output current, power output, solar energy irradiance of distributed photovoltaic power generation subsystem.
The mode of operation that described mode of operation decision-making module determines has: parallel network power generation pattern, smooth operation pattern, photovoltaic move the peak pattern and from the net autonomous mode.
The capacity setting of described energy storage subsystem is: be greater than the emergent institute of 2 times of one type load energy requirement, be less than the emergent institute of 10 times of one type load energy requirement; Being set to of energy storage subsystem power: get 1.5 times of one type load and start maximum power, 1.2 times of photovoltaic power generation array maximum powers maximum between the two, as the minimum power of energy storage subsystem; Get 3 times of one type load and start maximum power and 1.5 times of photovoltaic power generation array maximum powers minimum value between the two, as the maximum power of energy storage subsystem; Because energy storage subsystem power is got 1.5 times of one type load startup maximum power and 1.2 times of photovoltaic power generation array maximum powers maximum between the two, minimum power as the energy storage subsystem, thereby can meet the energy storage subsystem to solar energy power generating power-balance demand, can meet the demand of next type load electricity consumption starting power of case of emergency simultaneously.Maximum power to the energy storage subsystem is stipulated, is that cost drops into and the demand of economy in order to meet.The energy storage subsystem, between the emergent required energy of 2 times to 10 times one type loads, can meet emergency service required, also has certain capacity more than needed to meet photovoltaic power generation quantity simultaneously and moves the peak demand, and energy storage subsystem cost can be not too high, is controlled at zone of reasonableness.
Civil power off-peak period, energy storage subsystem SOC(charged state) in high-end trim operation, SOC(charged state) be controlled at 70% ~ 90%; When civil power high price period, energy storage subsystem SOC(charged state) in the low-end trim operation, preferred SOC(charged state) be controlled at 20% ~ 50%, now under the SOC minimum state, energy storage subsystem carried charge is greater than the emergent institute of 1.5 times of one type load energy requirement.Deposit peak by energy storage subsystem paddy and put, reduce to greatest extent the use of peak value city electric weight, the energy of photovoltaic generation is realized to maximum economic worth simultaneously.
In a period of time before sun sunrise and sunset, the radiant illumination of the sun is lower, general distributed photovoltaic power generation subsystem generated output is less than 5% of photovoltaic DC-to-AC converter rated power, now the photovoltaic DC-to-AC converter inversion efficiency is low even can not start, and the quality of power supply is also very poor, this period directly is stored in photovoltaic institute energy output in the energy storage subsystem, has improved the whole generating efficiency of solar energy power generating.
The generated output that defines certain moment distributed photovoltaic power generation subsystem is P1; Definition synchronization load electric power is P2; Definition photovoltaic DC-to-AC converter rated power is P3, and various mode of operations need satisfied condition be described below successively:
Condition that must be satisfied under the parallel network power generation pattern has: the generated output P1/ load electric power P2 of (1) distributed photovoltaic power generation subsystem is less than 0.2; (2) electricity price is high crest segment electricity price; (3) civil power is normal; (4) the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05; On off state under this pattern: K switch 0, K switch 4, K switch 5, K switch 6, K switch 7, K switch 8, K switch 1, K switch 2 closures, K switch 3 disconnects;
Condition that must be satisfied under the smooth operation pattern has: the generated output P1/ load electric power P2 of (1) distributed photovoltaic power generation subsystem is greater than 0.2; (2) electricity price is peak electricity tariff; (3) civil power is normal; (4) the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05; On off state under this pattern: K switch 0, K switch 4, K switch 5, K switch 6, K switch 7, K switch 8, K switch 1, K switch 2 closures, K switch 3 disconnects;
Photovoltaic moves condition that must be satisfied under the peak pattern to be had: (1) electricity price be off-peak period electricity price or the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem be less than 0.05; (2) civil power is normal; On off state under this pattern: K switch 0, K switch 5, K switch 6, K switch 8, K switch 7, K switch 4, K switch 3 closures, K switch 1, K switch 2 disconnect;
From condition that must be satisfied under the net autonomous mode, have: (1) civil power is undesired; On off state under this pattern: K switch 4, K switch 6, K switch 8, K switch 5, K switch 3 closures, K switch 0, K switch 1, K switch 2, K switch 7 disconnect.
The present invention be take the energy storage subsystem assembly as the energy snubber common platform, take the integrated management subsystem as comprehensive management platform, the distributed solar energy photovoltaic generation is implemented to the unified optimization aim of maximum efficiency generating, maximum economic benefit operation, safe demand response.
Compared with prior art, bimodulus solar photovoltaic generation system of the present invention has advantages of following: (1) energy snubber and power pooling feature based on the energy storage subsystem, realized that the distributed photovoltaic power generation subsystem smoothly accesses and is incorporated into the power networks; (2) energy snubber based on the energy storage subsystem and power buffering common platform, and total system management coordination, realized moving from net is autonomous of distributed photovoltaic power generation subsystem, meets emergent demand; (3) by utilizing low light level generating, improve the whole efficiency of distributed photovoltaic power generation, increased photovoltaic power generation quantity; (4) use peak period by part sun the subject of knowledge and the object of knowledge energy output is transferred to, improved the economic benefit of distributed photovoltaic power generation, improved economy.
The accompanying drawing explanation
Fig. 1 is embodiment of the present invention bimodulus solar photovoltaic generation system structured flowchart;
Fig. 2 is embodiment of the present invention bimodulus solar photovoltaic generation system operational decisions block diagram.
Embodiment
Describe implementation method of the present invention in detail below in conjunction with accompanying drawing.
With reference to Fig. 1 the present invention, by four parts, formed: distributed photovoltaic power generation subsystem, energy storage subsystem, load, integrated management subsystem.
Described distributed photovoltaic power generation subsystem comprises solar battery array, DC power distribution cabinet, photovoltaic DC-to-AC converter, solar battery array is electrically connected to DC power distribution cabinet, DC power distribution cabinet is electrically connected to photovoltaic DC-to-AC converter by K switch 1, photovoltaic DC-to-AC converter is electrically connected to AC power distribution cabinet/AC distribution panel by K switch 2, and AC power distribution cabinet/AC distribution panel is by the external civil power of K switch 0; The distributed photovoltaic power generation subsystem mainly realizes that gathering solar energy changes direct current energy into, and further is converted to AC energy.
Described load is as using the energy part, be divided into a type load (as emergency light) of interruptible load not and two type loads (as air-conditioning) that can interruption of power supply, AC power distribution cabinet/AC distribution panel is electrically connected to two type loads by K switch 4, K switch 7, and AC power distribution cabinet/AC distribution panel is electrically connected to a type load by K switch 4, K switch 8; .
Described energy storage subsystem comprises battery pile and bidirectional energy-storage inverter, and battery pile is electrically connected to the bidirectional energy-storage inverter is two-way by K switch 5, and the bidirectional energy-storage inverter is electrically connected to AC power distribution cabinet/AC distribution panel is two-way by K switch 6; The energy storage subsystem is as the buffer platform of energy and power, can store the solar energy electric weight, also can further be fed to the electrical network utilization by the bidirectional energy-storage inverter, in support by a part of electric flux simultaneously, civil power break down can not electric power thus supplied under, discharge to a type load emergency service.
The integrated management subsystem is implemented the management of whole bimodulus solar photovoltaic generation system is controlled, and command system is operated under each pattern, realizes the functions such as energy acquisition, production, conversion, emergency service, energy storage management subsystem, stored energy release.
Described integrated management subsystem comprises the civil power monitoring modular, the new forms of energy monitoring modular, the BMS monitoring modular, the step price database, load monitoring module and mode of operation decision-making module, the civil power monitoring modular, the new forms of energy monitoring modular, the BMS monitoring modular, step price database and load monitoring module all are electrically connected to the mode of operation decision-making module is two-way, the new forms of energy monitoring modular is connected with the two-way electricity of distributed photovoltaic power generation subsystem, the BMS monitoring modular is connected with the two-way electricity of energy storage subsystem, the load monitoring module is connected with the two-way electricity of load, the civil power monitoring modular is electrically connected to AC power distribution cabinet/AC distribution panel is two-way.
The civil power monitoring modular, mainly monitor the quality of power supply relevant information such as voltage, electric current, power, power factor (PF) of civil power.The BMS monitoring modular, mainly monitor voltage, electric current, temperature, the SOC(charged state of energy storage subsystem), the SOH(health status) etc. information.The step price database is stored current step price data.The load monitoring module, the use energy situation of monitoring load, realize the excision of a non-type load under case of emergency.The new forms of energy monitoring modular is mainly monitored the information such as the input voltage, input current, input power, output voltage, output current, power output, solar energy irradiance of distributed photovoltaic power generation subsystem.
The capacity setting of described energy storage subsystem is: be greater than the emergent institute of 2 times of one type load energy requirement, be less than the emergent institute of 10 times of one type load energy requirement; Being set to of energy storage subsystem power: get 1.5 times of one type load and start maximum power, 1.2 times of photovoltaic power generation array maximum powers maximum between the two, as the minimum power of energy storage subsystem; Get 3 times of one type load and start maximum power and 1.5 times of photovoltaic power generation array maximum powers minimum value between the two, as the maximum power of energy storage subsystem; Because energy storage subsystem power is got 1.5 times of one type load startup maximum power and 1.2 times of photovoltaic power generation array maximum powers maximum between the two, minimum power as the energy storage subsystem, thereby can meet the energy storage subsystem to solar energy power generating power-balance demand, can meet the demand of next type load electricity consumption starting power of case of emergency simultaneously.Maximum power to the energy storage subsystem is stipulated, is that cost drops into and the demand of economy in order to meet.The energy storage subsystem, between the emergent required energy of 2 times to 10 times one type loads, can meet emergency service required, also has certain capacity more than needed to meet photovoltaic power generation quantity simultaneously and moves the peak demand, and energy storage subsystem cost can be not too high, is controlled at zone of reasonableness.
Fig. 2 is embodiment of the present invention bimodulus solar photovoltaic generation system operational decisions block diagram, is the core operation logic of integrated management subsystem.Come various running statuses and the pattern of illustrative system below in conjunction with Fig. 2.
The mode of operation that described mode of operation decision-making module determines has: parallel network power generation pattern, smooth operation pattern, photovoltaic move the peak pattern and from the net autonomous mode.
The generated output that defines certain moment distributed photovoltaic power generation subsystem is P1, is the photovoltaic array generated output in the present embodiment; Definition synchronization load electric power is P2; Definition photovoltaic DC-to-AC converter rated power is P3.Various mode of operations need satisfied condition be described below successively.
The parallel network power generation pattern: condition that must be satisfied under this pattern has the generated output P1/ load electric power P2 of (1) distributed photovoltaic power generation subsystem to be less than 0.2; (2) electricity price is high crest segment electricity price; (3) civil power is normal; (4) the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05.On off state under this pattern: K switch 0, K switch 4, K switch 5, K switch 6, K switch 7, K switch 8, K switch 1, K switch 2 closures, K switch 3 disconnects.Have following characteristics under this mode of operation: the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05, show that illumination condition is good, photovoltaic DC-to-AC converter can normally start and carry out the tracking of MPPT(pressure point of maximum efficiency) maximal efficiency work generating; The generated output P1/ load electric power P2 of distributed photovoltaic power generation subsystem is less than 0.2, and the need for electricity that shows to load is large, and the ratio that solar power generation power accounts for aggregate supply is low, is difficult for the load Electrical Safety is caused to harmful effect; Electricity price is electricity price peak period, and the electric energy that sun the subject of knowledge and the object of knowledge sends obtains maximum economic worth utilization; Civil power is normal, the necessary condition of solar grid-connected generating.
The smooth operation pattern: condition that must be satisfied under this pattern has the generated output P1/ load electric power P2 of (1) distributed photovoltaic power generation subsystem to be greater than 0.2; (2) electricity price is peak electricity tariff; (3) civil power is normal; (4) the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05.On off state under this pattern: K switch 0, K switch 4, K switch 5, K switch 6, K switch 7, K switch 8, K switch 1, K switch 2 closures, K switch 3 disconnects.Have following characteristics under this mode of operation: the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05, show that illumination condition is good, photovoltaic DC-to-AC converter can normally start and carry out the tracking of MPPT(pressure point of maximum efficiency) maximal efficiency work generating; The generated output P1/ load electric power P2 of distributed photovoltaic power generation subsystem is greater than 0.2, the need for electricity that shows to load is little, the ratio that solar power generation power accounts for aggregate supply is high, may cause harmful effect to the load Electrical Safety, therefore need to carry out the level and smooth of power with energy-storage system, the work of bidirectional energy-storage inverter; Electricity price is high crest segment electricity price, and the electric energy that sun the subject of knowledge and the object of knowledge sends obtains maximum economic worth utilization; Civil power is normal, the necessary condition of solar grid-connected generating.
Photovoltaic moves the peak pattern: condition that must be satisfied under this pattern have (1) electricity price be off-peak period electricity price or the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem be less than 0.05; (2) civil power is normal.On off state under this pattern: K switch 0, K switch 5, K switch 6, K switch 8, K switch 7, K switch 4, K switch 3 closures, K switch 1, K switch 2 disconnect.Have following characteristics under this mode of operation: electricity price is the par period, the electric energy that sun the subject of knowledge and the object of knowledge sends can not obtain maximum economic worth utilization, therefore the solar energy electricity can be stored in the energy storage subsystem, treat that electricity price is powered to load peak period again, reduce the use amount of civil power peak period, brought into play the economic worth of solar energy maximum; Civil power is normal, the necessary condition of solar grid-connected generating.
Special a kind of situation, when the generated output P1/ of distributed photovoltaic power generation subsystem photovoltaic DC-to-AC converter rated power, P3 is less than 0.05, show that illumination condition is poor, photovoltaic DC-to-AC converter now possibly can't normally start and carry out the tracking of MPPT(pressure point of maximum efficiency) maximal efficiency work generating, even if perhaps can normally start, but the efficiency of inversion generating is also very low, now, can directly to solar energy-electric energy, be stored by the energy storage subsystem, under the little current conditions of low-power, the charge efficiency of energy storage subsystem is high all the better, even therefore can realize under low light condition, still can realize the generating of distributed photovoltaic power generation subsystem and be stored in battery energy storage system.Utilize like this solar energy whole generating capacity to improve more than 5%.
From the net autonomous mode: condition (1) civil power that must be satisfied under this pattern is undesired.On off state under this pattern: K switch 4, K switch 6, K switch 8, K switch 5, K switch 3 closures, K switch 0, K switch 1, K switch 2, K switch 7 disconnect.Have following characteristics under this mode of operation: civil power is undesired, under the energy allotment and cushioning effect of energy storage subsystem, distributed photovoltaic power generation subsystem and energy storage subsystem provide emergency power jointly to a type load, ensure need for electricity and the Electrical Safety of important load.
In a word, compared with prior art, the building energy storage provided by the present invention energy conserving system of meeting an urgent need has following characteristics and advantage:
(1) energy snubber based on the energy storage subsystem and power pooling feature, realized that the distributed photovoltaic power generation system smoothly accesses and is incorporated into the power networks;
(2) energy snubber based on the energy storage subsystem and power buffering common platform, and total system management coordination, realized moving from net is autonomous of distributed photovoltaic power generation subsystem, meets emergent demand;
(3) by utilizing low light level generating, improve the whole efficiency of distributed photovoltaic power generation, increased photovoltaic power generation quantity;
(4) use peak period by part sun the subject of knowledge and the object of knowledge energy output is transferred to, improved the economic benefit of distributed photovoltaic power generation, improved economy.
The above is only preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvement and modification, these improvement and modification also should be considered as protection scope of the present invention.
Claims (3)
1. the bimodulus solar photovoltaic generation system, is characterized in that, distributed photovoltaic power generation subsystem, energy storage subsystem, load, four parts of integrated management subsystem, consists of;
Described distributed photovoltaic power generation subsystem comprises solar battery array, DC power distribution cabinet, photovoltaic DC-to-AC converter, solar battery array is electrically connected to DC power distribution cabinet, DC power distribution cabinet is electrically connected to photovoltaic DC-to-AC converter by K switch 1, photovoltaic DC-to-AC converter is electrically connected to AC power distribution cabinet/AC distribution panel by K switch 2, and AC power distribution cabinet/AC distribution panel is by the external civil power of K switch 0; The distributed photovoltaic power generation subsystem mainly realizes that gathering solar energy changes direct current energy into, and further is converted to AC energy;
Described load comprises a type load of interruptible load not and two type loads that can interruption of power supply, and AC power distribution cabinet/AC distribution panel is electrically connected to two type loads by K switch 4, K switch 7, and AC power distribution cabinet/AC distribution panel passes through K switch 4, K switch 8 is electrically connected to a type load;
Described energy storage subsystem comprises battery pile and bidirectional energy-storage inverter, and battery pile is electrically connected to the bidirectional energy-storage inverter is two-way by K switch 5, and the bidirectional energy-storage inverter is electrically connected to AC power distribution cabinet/AC distribution panel is two-way by K switch 6; The energy storage subsystem is as the buffer platform of energy and power, for storing the solar energy electric weight, further be fed to the electrical network utilization by the bidirectional energy-storage inverter, in support by a part of electric flux simultaneously, civil power break down can not electric power thus supplied under, discharge to a type load emergency service;
The integrated management subsystem is implemented the management of whole bimodulus solar photovoltaic generation system is controlled;
Described integrated management subsystem comprises the civil power monitoring modular, the new forms of energy monitoring modular, the BMS monitoring modular, the step price database, load monitoring module and mode of operation decision-making module, the civil power monitoring modular, the new forms of energy monitoring modular, the BMS monitoring modular, step price database and load monitoring module all are electrically connected to the mode of operation decision-making module is two-way, the new forms of energy monitoring modular is connected with the two-way electricity of distributed photovoltaic power generation subsystem, the BMS monitoring modular is connected with the two-way electricity of energy storage subsystem, the load monitoring module is connected with the two-way electricity of load, the civil power monitoring modular is electrically connected to AC power distribution cabinet/AC distribution panel is two-way,
The civil power monitoring modular, voltage, electric current, power, the power factor (PF) quality of power supply relevant information of monitoring civil power; The BMS monitoring modular, voltage, electric current, temperature, charged state, the health status information of monitoring energy storage subsystem; The step price database is stored current step price data; The use energy situation of load monitoring module monitors load, realize the excision of a non-type load under case of emergency; The new forms of energy monitoring modular is mainly monitored input voltage, input current, input power, output voltage, output current, power output, the solar energy irradiance information of distributed photovoltaic power generation subsystem;
The mode of operation that described mode of operation decision-making module determines has: parallel network power generation pattern, smooth operation pattern, photovoltaic move the peak pattern and from the net autonomous mode.
2. bimodulus solar photovoltaic generation system according to claim 1, is characterized in that, the capacity setting of described energy storage subsystem becomes: be greater than the emergent institute of 2 times of one type load energy requirement, be less than the emergent institute of 10 times of one type load energy requirement; The power setting of energy storage subsystem becomes: get 1.5 times of one type load and start maximum power and 1.2 times of photovoltaic power generation array maximum powers maximum between the two, as the minimum power of energy storage subsystem; Get 3 times of one type load and start maximum power and 1.5 times of photovoltaic power generation array maximum powers minimum value between the two, as the maximum power of energy storage subsystem;
Civil power off-peak period, the charged state of energy storage subsystem is moved in high-end trim, and charged state is controlled at 70% ~ 90%; When the civil power high price period, the charged state of energy storage subsystem is moved in low-end trim, and charged state is controlled at 20% ~ 50%, and now, under the SOC minimum state, energy storage subsystem carried charge is greater than the emergent institute of 1.5 times of one type load energy requirement.
3. bimodulus solar photovoltaic generation system according to claim 1 and 2, is characterized in that, the generated output that defines certain moment distributed photovoltaic power generation subsystem is P1; Definition synchronization load electric power is P2; Definition photovoltaic DC-to-AC converter rated power is P3; Various mode of operations need satisfied condition be described below successively:
Condition that must be satisfied under the parallel network power generation pattern has: the generated output P1/ load electric power P2 of (1) distributed photovoltaic power generation subsystem is less than 0.2; (2) electricity price is high crest segment electricity price; (3) civil power is normal; (4) the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05; On off state under this pattern: K switch 0, K switch 4, K switch 5, K switch 6, K switch 7, K switch 8, K switch 1, K switch 2 closures, K switch 3 disconnects;
Condition that must be satisfied under the smooth operation pattern has: the generated output P1/ load electric power P2 of (1) distributed photovoltaic power generation subsystem is greater than 0.2; (2) electricity price is peak electricity tariff; (3) civil power is normal; (4) the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem is greater than 0.05; On off state under this pattern: K switch 0, K switch 4, K switch 5, K switch 6, K switch 7, K switch 8, K switch 1, K switch 2 closures, K switch 3 disconnects;
Photovoltaic moves condition that must be satisfied under the peak pattern to be had: (1) electricity price be off-peak period electricity price or the generated output P1/ photovoltaic DC-to-AC converter rated power P3 of distributed photovoltaic power generation subsystem be less than 0.05; (2) civil power is normal; On off state under this pattern: K switch 0, K switch 5, K switch 6, K switch 8, K switch 7, K switch 4, K switch 3 closures, K switch 1, K switch 2 disconnect;
From condition that must be satisfied under the net autonomous mode, have: (1) civil power is undesired; On off state under this pattern: K switch 4, K switch 6, K switch 8, K switch 5, K switch 3 closures, K switch 0, K switch 1, K switch 2, K switch 7 disconnect.
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