Monitor system when the electric energy production of the solar battery is real of group
The solar electrical energy generation of regenerated energy can be divided into solar energy and only generated electricity (also called the photovoltaic) Two big classes that and solar energy heat generates electricity, the latter because technology is more complicated, can only be used in larger capacity, it is sure to limit to employ and receive, so employ less actually at present. It has a great deal of advantages such as being inexhaustible, pollution-free that the solar energy only generates electricity, have already become the focus that the mankind has sought new energy. But employ the intermittence, the shortcoming of electric energy production related to climatic condition at the same time. So, in order to raise the utilization factor of the solar battery, it is very necessary to real-time monitor electric energy production, can find the abnormal circumstance appearing in the work of the solar battery early. Have proposed the cipher scheme of the real-time monitor system of electric energy production of a kind of solar battery here. The system utilizes AT89S52 one piece to be mechanically controlled, adopts Hall’s electric current transducer to measure the output current of the solar battery, it stresses the advantage can change the electric current into the voltage to measure under hardly consuming the energy situation.
Systematic hardware design
System hardware circuit, mainly composed of solar battery, Hall’s electric current transducer, I/U chance-over circuit, control system which the constituent display device, AT89S52 one piece organization of the liquid crystal 1602 become, and 5 parts of energy-storage system that the lead-acid battery forms make up. Its working phase: When the solar battery receives the illumination, produce the electric current, to the accumulator charge, the one-chip computer offers the driving voltage by storage battery through the pressure accumulator, the electric quantity produced to the solar battery carries on the real-time acquisition of signal. Because the one-chip computer can only receive the voltage signal, is regulated the signal to the appropriate voltage before signal receive by I/U, U/U conversion module. Dealt with by internal arithmetic, gave 1602 liquid crystal disply devices to reveal the electric energy production of the battery finally.
1,A/D conversion module
Need to change into the digital signal after imitating the one-chip computer of signal input, because need to measure output voltage and electric current of the solar battery at the same time, so it is 8 bit serial double-channel analog to digital converters to adopt ADC0832, A/D conversion accuracy depend on that there is basic reference reference voltage with high stability, the reference voltage sets as 5V, is produced from TL431. The analog signal is filtered and sent AD input end through RC, then carry on the serial output after the analog to digital converter.
2,I/U conversion module
Because the I/O interface of the one-chip computer can only receive the voltage signal of 0- 5V, gathers the output current of the solar battery to need to change the electric current signal into the voltage signal in real time, because this system is ancillary equipment of a solar cell system, it is primary problem to reduce energy dissipation as much as possible. Therefore Hall’s electric current transducer becomes chosen first, work according to the Hall effect principle, can change the electric current signal into the voltage signal on condition that hardly consume energy. This system adopts the electric current transducer of Hall of Model TBCl0SY, the specified output voltage is ( 4 0.5%) V, 15V dual power supply, it is O- 15A, basically satisfied small-scale application systematic to the photovoltaic of the network to measure the current range.
3,The power is designed
The normal operation of the one-chip computer needs to supply the power for one slice of inner transistor-resistor logics or field effect tubes, make its work in the corresponding state. AT89S52 needs a 5V power (actual working voltage is 3.6- 6.0V) . Can supply power, obtain the intersection of 4.5V and about voltage, for generate electricity independently system this by the intersection of voltage regulation and way, with commutate, and long term administration, in view of the power life-span, this device offers by city power or dry battery and drives the power not to correspond to reality, so optimum alternative should solar battery battery-driven inside system, through voltage regulation of the voltage regulation integration block 7805 being 5V, input the one-chip computer Vcc pin, drives one-chip computer and liquid crystal disply device. TBCl0SY Hall’s electric current transducer, need 15V dual power supply, adopts the inner storage battery electricity of the system too. , in 15V, thus drive it to work through voltage regulation integration block 7805, 7915 voltage regulation.
4,Export the display module
The electric quantity formula is Q =UIT, time among them T can confirm, such as sampling through 3min once by oneself during programming of software depending upon need, pass 1602 liquid crystal display electric energy production of backload of internal arithmetic. In order to save the electric energy, through setting up the electrical relay, make the liquid crystal display go out automatically after revealing 10s.
Systematic software design
Systematic software design is mainly finished by one-chip computer, mainly realize data acquisition and controlled display, the whole software system design adopts the modularization thought, it measures and reveals flow of program.
Analysis of system testing
As the example with the small-scale photovoltaic system from the net of 200W, nominal voltage 24V, maximum current 6.18A, storage battery 200Ah. Design normal discharge time as 2- 3d, the electric current of 0- 6.18A is changed into the voltage of 0- 5V in proportion, the attenuation pad formed by 2 pieces of resistance, outputting the proportion of voltage amplification decides by ratio of the resistance R1 and R2, presume it is 5/24 that U/U changes the proportion, then R7 =10k, R6 +Rp2 =48k. According to the formula Q of electric quantity =UIT, experiment time from will it be 12 o’clock noon to will it be 2 o’clock afternoon, from reveal electric quantity begin, record one real power and the intersection of the monitor system and expicity data through 3min while being every, every error is smaller than 3%, table l provides initial 10 situations of error in emasurement, increases with the electric quantity gradually, the excursion of error dwindles gradually.
Conclusion
By AT89S52 one-chip computer, the real-time monitor system of solar battery electric energy production that Hall’s electric current transducer and 1602 liquid crystals,etc. form is simple in construction, with low costs non-maintaining and electric consumption little can real-time monitor electric energy production of the solar battery effectivelying, find the abnormal circumstance appearing in the work of the solar battery early. System design this suitable for as the intersection of photovoltaic and auxiliary part of system small-scale from the photovoltaic system of network, the intersection of system installation and device this life-span durable and reliable longer at the same time, make it in employ extensively from the photovoltaic system of network.
Tags: Monitor system when the electric energy production of the solar battery is real of group
