CN203301400U - A solar photovoltaic power generation system circuit - Google Patents
A solar photovoltaic power generation system circuit Download PDFInfo
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- CN203301400U CN203301400U CN2013203446852U CN201320344685U CN203301400U CN 203301400 U CN203301400 U CN 203301400U CN 2013203446852 U CN2013203446852 U CN 2013203446852U CN 201320344685 U CN201320344685 U CN 201320344685U CN 203301400 U CN203301400 U CN 203301400U
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- solar
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- generation system
- battery array
- batteries
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Abstract
The utility model discloses a solar photovoltaic power generation system circuit comprising a solar battery array, a storage battery group, a load, a unidirectional converter, a bidirectional converter, and a DC bus. The output of the solar battery array is connected with the DC bus via the unidirectional converter. The storage battery group is connected with the DC bus via the bidirectional converter. The load is connected with the DC bus. The number of the solar battery array and storage battery group connected in series or in parallel is not required to satisfy a strict matching relation and flexible selection and design can be executed according to circuit structure and power capacity. The high-voltage end of the bidirectional converter is connected with the DC bus in parallel. Optimal design can be executed on the bidirectional converter. Energy required by system overload is provided by the discharging of storage batteries. The power grade of the solar batteries is just configured according to the rated power of a system so as to reduce system cost. The solar photovoltaic power generation system circuit has simple system structure and may control the charging and discharging current of the storage batteries with the bidirectional converter so as to protect the storage batteries against damage.
Description
Technical field
The utility model relates to a kind of solar photovoltaic generation system circuit, belongs to the generation of electricity by new energy technical field.
Background technology
Along with fossil energy consumes rapidly, and the energy crisis of bringing thus and environmental pollution increasingly sharpen, and new, clean regenerative resource is actively being found and developed in countries in the world all in recent years.The characteristics such as inexhaustible, nexhaustible and clean and safe that solar energy has are desirable regenerative resources.Solar energy power generating has great importance to alleviating energy crisis and environmental contamination reduction, and has broad application prospects.
With the solar photovoltaic generation system of storage battery as energy-storage units, generally can be formed by solar cell, storage battery, monotonic transformation device, reversible transducer and DC load.Due to the introducing of storage battery, the required energy of system overload can be provided by battery discharging, and the power grade of solar cell only need be configured according to system rated power, thereby reduces system cost.In engineering practice at present, a lot of enterprises are when the capacity of actual disposition design solar photovoltaic generation system, generally according to engineering experience, design, rather than carry out according to practical situations, this may cause on the one hand the power system capacity unreasonable allocation to cause the waste of resource, may cause on the other hand system some the time because of the off-capacity cisco unity malfunction.
The utility model content
For the problems referred to above that solar photovoltaic generation system circuit in prior art exists, the utility model provides a kind of solar photovoltaic generation system circuit.
The technical solution of the utility model is:
A kind of solar photovoltaic generation system circuit, comprise solar battery array, batteries, load, monotonic transformation device, reversible transducer, DC bus; Solar battery array exports DC bus to by the monotonic transformation device, and batteries is connected to DC bus by reversible transducer, and load is connected on DC bus.
Further, described solar battery array is as power supply unit, and described batteries is as energy-storage units, and described load is as power unit.
Further, the connection in series-parallel number of described solar battery array and batteries needn't meet strict matching relationship, can select according to circuit structure and power capacity.
Further, discharging and recharging of described batteries shares a reversible transducer, by reversible transducer, controls the accumulator cell charging and discharging electric current simultaneously.
Further, the inclination angle Ф of described solar battery array is 37 °.
The beneficial effects of the utility model are:
(1) the connection in series-parallel number of solar battery array and batteries needn't meet strict matching relationship, can select flexibly and design according to circuit structure and power capacity;
(2) high-pressure side of reversible transducer is in parallel with DC bus, and the voltage stabilization of DC bus, therefore can the optimal design reversible transducer;
(3) due to the introducing of batteries, the required energy of system overload can be provided by battery discharging, and the power grade of solar cell only need be configured according to system rated power, thereby reduces system cost;
(4) system configuration is simpler, and accumulator cell charging and discharging shares a reversible transducer and realizes, but the weight of mitigation system can also be controlled the accumulator cell charging and discharging electric current by reversible transducer simultaneously, and the protection storage battery is not damaged.
The accompanying drawing explanation
Fig. 1 is solar photovoltaic generation system circuit structure diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
The structure of a kind of solar photovoltaic generation system circuit of the utility model as shown in Figure 1, comprising: solar battery array, batteries, load, monotonic transformation device, reversible transducer, DC bus (DC Bus), etc.Solar battery array exports DC bus to by the monotonic transformation device, batteries is connected to DC bus by reversible transducer, and load is connected on DC bus, and solar battery array is as power supply unit, batteries is as energy-storage units, and load is as power unit.
The Capacity design method of a kind of solar photovoltaic generation system circuit of the utility model, be according to the residing specific environment condition of solar battery array (geographical position, solar radiant energy, weather and meteorology etc.), design not only reliable but also economic photovoltaic generating system.The power output of solar battery array is relevant with solar module connection in series-parallel quantity, series connection is in order to obtain required operating voltage, parallel connection is in order to obtain required operating current, and the assembly of right quantity namely forms needed solar battery array through connection in series-parallel.According to loading condition, have sunshine and all the time according to the time, all need to use storage battery, utilize the requirement that discharges and recharges to meet running to storage battery.The variation of solar battery array institute operating area weather will directly affect its energy output.If run into continuous several days rainy weathers, solar battery array just almost can not generate electricity, and can only carry out powering load by storage battery.And when solar irradiation was sufficient, the unnecessary energy that solar cell sends charged a battery again.The solar energy total radiation that location meteorological observatory provides or total sunshine time are indispensable data to the amount of capacity that determines storage battery.
Below in conjunction with regional actual conditions, the utility model is described.
The design of solar cell Capacity design described in the utility model and battery capacity, the solar radiation energy data information of the last decade that provides take Nanjing meteorological observatory is as foundation:
In Nanjing longitude and latitude: east longitude 118 degree 48 minutes, north latitude 32 degree; It is 12 days that the In Nanjing last decade carrys out the overcast and rainy time the longest continuously, the shortest 6 days, average out to
N d=8 days; The annual solar radiation quantity of In Nanjing last decade is 4468.4 MJ/m
2(every square metre of area was accepted in 1 year solar energy total radiation).
The native system load request is: rated voltage is
V o=100VDC; Rated power is
P o=500W; The operating time of supposing load every day is
t d=7 hours (h), load day power consumption
E Ld=
P o*
t d=3500Wh, continuous 8 days overcast and rainy during, the continuous net cycle time of load
T=
t d*
N d=56 hours (h).
(1) Capacity design of solar battery array
In order to simplify the control of photovoltaic generating system, consider to meet simultaneously the load electricity consumption needs of Various Seasonal, can determine the solar battery array inclination angle according to following rule, that is:
Consider during the whole year all can the optimum utilization solar battery array energy, array mounted angle Ф is than local latitude many 5
o, during the native system actual installation, the solar battery array mounted angle is got Ф=37
o.
Annual solar radiation quantity 4468.4 MJ/m according to the above In Nanjing last decade that provides
2, can calculate per day solar radiation quantity is 12242 kJ/m
2(by 365 days, calculating in 1 year).Consider the solar battery array mounted angle, introduce inclined-plane correction factor (its empirical value generally gets 1.1), obtain the per day solar radiation quantity on solar battery array inclined-plane
H t=13466 kJ/m
2.Further by per day amount of radiation
H tBe converted to etalon optical power (1000W/ m
2) under per day radiation the time number
H:
H=
H t×2.778／10000h=13466?kJ/?m
2×(2.778/10000)＝3.74?(h)
In formula, 2.778/10000 (hm
2/ kJ) the coefficient of number when per day amount of radiation is scaled to the per day radiation under etalon optical power.
Due to load day power consumption be 3500Wh, the efficiency of establishing the monotonic transformation device is 95%, the energy that needs every day solar battery array to provide
E PV(the watt-hour number is Wh):
Consider the loss that solar module combination, decay, dust, charge efficiency etc. cause, introduce the solar module correction factor, generally get 0.8.Therefore, can draw the needed battery component output of system peak power
P mFor:
(2) Capacity design of storage battery
Power supply is most important continuously to proof load for the capacity of storage battery.In 1 year, there is very big difference in each month of solar battery array energy output, and its energy output, in the month that can not meet the load need for electricity, needs battery discharging to supply; In the month that surpasses the load need for electricity, unnecessary electric energy charges a battery and stores.Because the load electricity consumption during continuously overcast and rainy must obtain from storage battery, so the battery capacity electric weight more required than load is much bigger.
The energy storage device of solar photovoltaic generation system is the main plumbic acid maintenance-free storage battery that uses at present.It is the lead acid accumulator of 48V that experimental system is selected nominal voltage, the needed battery capacity of system (ampere-hour, Ah) can calculate according to experience in design formula commonly used:
In formula,
C B-battery capacity (ampere-hour, Ah);
E LBd-load every day is by the amount of power supply of storage battery, 3500Wh;
N d-continuous overcast and rainy days, 8 days;
R BThe correction factor of-battery discharging efficiency, generally get 1.05;
U B-storage battery rated voltage, 48V;
η
Boost-reversible transducer efficiency, get 95%;
F DThe depth of discharge of-storage battery, generally get 0.75;
L BThe maintenance rate of-storage battery, generally get 0.9.
According to the result of calculation of following formula, choose in theory the nominal lead acid accumulator of 48V/1000Ah.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (5)
1. a solar photovoltaic generation system circuit, is characterized in that: comprise solar battery array, batteries, load, monotonic transformation device, reversible transducer, DC bus; Solar battery array exports DC bus to by the monotonic transformation device, and batteries is connected to DC bus by reversible transducer, and load is connected on DC bus.
2. a kind of solar photovoltaic generation system circuit according to claim 1, it is characterized in that: described solar battery array is as power supply unit, and described batteries is as energy-storage units, and described load is as power unit.
3. a kind of solar photovoltaic generation system circuit according to claim 1, it is characterized in that: the connection in series-parallel number of described solar battery array and batteries needn't meet strict matching relationship, can select according to circuit structure and power capacity.
4. a kind of solar photovoltaic generation system circuit according to claim 1 is characterized in that: discharging and recharging of described batteries shares a reversible transducer, by reversible transducer, controls the accumulator cell charging and discharging electric current simultaneously.
5. a kind of solar photovoltaic generation system circuit according to claim 1, it is characterized in that: the inclination angle Ф of described solar battery array is 37
o.
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| CN2013203446852U CN203301400U (en) | 2013-06-17 | 2013-06-17 | A solar photovoltaic power generation system circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312224A (en) * | 2013-06-17 | 2013-09-18 | 江苏大学 | Solar photovoltaic power generation system circuit and capacity design method thereof |
-
2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312224A (en) * | 2013-06-17 | 2013-09-18 | 江苏大学 | Solar photovoltaic power generation system circuit and capacity design method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20150617 |
|
| EXPY | Termination of patent right or utility model |