工頻隔離變壓器 ，是指頻率為工頻(50HZ)的變壓器，變壓器初級和次級都有電感，與逆變器里面的濾波電感，都可以儲存一定的電能。而當電感流過電流時，由于電流會存在磁場，當電流的磁場經過磁芯時，電流磁場會打破“磁疇”的平衡狀態，使“磁疇”同時趨向于外部磁場的方向， 進而導致磁芯此時會對外表現出磁場。而這個磁芯磁場從無到有的過程，其實就是電感儲存磁場的過程。
As can be seen from the figure above, the peak power of the off-grid inverter using high-frequency isolation technology can reach twice the rated power; Off-grid inverter with power frequency isolation technology, the peak power can reach three times the rated power. Then, a 3kW high-frequency off-grid inverter can drive a 1P air conditioner (starting power about 5.5kVA), and a 12kW power-frequency off-grid inverter can drive a 6P air conditioner (starting power about 33kVA). The inverter provides starting energy for the load, partly from the battery or photovoltaic modules, and the excess is also provided by the inverter itself (internal energy storage components -- capacitors and inductors).
SPF 4000-12000T HVM
Capacitors and inductors are both energy storage components. The difference is that capacitors store electric energy in the form of electric fields. The larger the capacity of capacitors, the more electricity they store. Inductors store energy in the form of magnetic fields. The larger the permeability of the inductor's magnetic core, the larger the inductance, and the more energy can be stored.
The principle of the capacitor can be seen from its structure. As shown in the figure above, there is a metal plate on each side leading to two electrodes separated by insulating material. In the case that no external electric field is applied to both ends of the capacitor, the positive and negative charges on the two plates are in a state of equilibrium.
As shown above, when both ends of an electric field applied in capacitance, end plate began to gather on the positive, the other end of the plate is gathered negative charge, as at the ends of the capacitor voltage rising to power supply voltage, capacitance charging to stop, if disconnect external circuit, capacitance on energy will not disappear, the reason is that with positive and negative charge on the characteristic of "the same, opposites attract", The charges at both ends attract and store energy.
Power frequency isolation transformer, refers to the frequency of power frequency (50HZ) transformer, transformer primary and secondary have inductance, and inverter inside the filter inductance, can store a certain amount of electric energy. When the inductor flows through the current, there will be a magnetic field. When the magnetic field of the current passes through the magnetic core, the current magnetic field will break the equilibrium state of the "magnetic domain" and make
the "magnetic domain" tend to the direction of the external magnetic field, resulting in the magnetic field of the core at this time. The process of the core magnetic field from scratch is actually the process of inductive storage of magnetic field.
Inductance is a component formed by enameled wire wound on an insulating skeleton or magnetic core. When the coil is energized, can produce a magnetic field in the surrounding, when through the current communication ingredients, fields changing, according to the principle of electromagnetic induction, the change of magnetic field lines and can produce inductive electromotive force on both ends of the coil, but the direction of the electromotive force and the original electromotive force in the opposite direction, and to hinder the current changes.
It can be seen that the main function of inductance is to hinder the change of current. As the current increases, it blocks the increase and stores some of the energy through the magnetic field. When the current is reduced, it blocks the reduction of the current in the circuit and releases the stored energy to maintain the current. Because the inductor has the property of storing energy, it has the function of filtering and delay.
Photovoltaic off-grid system, the output power is determined by the load. When a motor and other inductive load is started, a very large current is needed in a short time, and these energies cannot be provided by photovoltaic and battery. If the overload output of lithium battery is carried out in a short time, it will cause an explosion. However, the capacitor, inductor, transformer in the inverter can store power, but also a short time to magnify several times the output without damage.