Photovoltaic installations. Solar power plant equipment. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Alternative energy sources

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Inverters RU-500, RU-1200

Inverters (Fig. 2.4) are used to convert the DC energy of a solar battery or lead-acid batteries into AC power of industrial frequency.

The inverter is equipped with a controller that ensures the normal functioning of the battery as part of the FES.

Fig.2.4. inverters

Advantages:

• excellent weight and size indicators - up to 600 W per DM, which is ensured by the use of modern methods of energy conversion, original magnetic materials and modern element base;
• good output signal shape;
• very high efficiency;
• the device allows short-term overloads up to 30% and a long-term reduction in power consumption;
• has systems of protection against short circuit, long-term overload and provision of idling mode.

The main technical characteristics of the inverters are given in Table. 2.3.

Table 2.3. Main technical characteristics of inverters

(click to enlarge)

Controllers K3P12-3, K-150, K-300, K-500

appointment

Controllers (Fig. 2.5) are designed to control the modes of charging and discharging batteries as part of photovoltaic systems, ensure maximum performance and durability of all elements of the system, protect it from overloads and short circuits.

Fig.2.5. Controllers

Table 2.4. Main technical characteristics of controllers

(click to enlarge)

Advantages:

• protection against incorrect connection of the battery;
• LED indication of charging;
• LED indication of low voltage on the battery;
• LED and sound indication of overcurrent;
• protection against discharge to the solar module (blocking diode);
• operating temperature range - 20...+ 50°C.

Application

The KZR12-3 controller is used to control the charge and discharge of batteries as part of portable photovoltaic systems.

Controllers K-150, K-300 and K-500 are used in portable and stationary photovoltaic systems of high power, as well as for direct charging of batteries from mains direct current sources.

Uninterruptible power supply

appointment

The power supply unit (Fig. 2.6) is designed for guaranteed power supply of the consumer with industrial frequency current in conditions of instability of the supply network, in particular in the event of a sudden power failure.

Fig.2.6. Power Supply

Main Specifications:

• input voltage 220 V + 10% - 20%, 50 Hz;
• output voltage 220 V + 3% - 5%;
• output voltage frequency 50 Hz - 0,3%, + 0,1%;
• harmonic coefficient, no more than 0,025;
• rated output power - 250W. - efficiency-0,91/0,94;
• admissible overloads (no more than 2 sec.) - 16 times;
• the device is equipped with a set of maintenance-free rechargeable batteries (AB), providing continuous overload power supply with a power of 130W for 6 hours, has an AB charge control circuit using the IU method, an AB charge level indicator;
• has protection: from short circuit currents, from overload currents from overcharging and overdischarging of AB;
• The device is equipped with light and sound indication.

Advantages:

• in the event of a sudden loss of mains voltage, the device instantly switches to work A, continuously provides loads with industrial frequency current, excluding power failures;
• the device provides a good shape of the output voltage;
• has a high efficiency, which allows it to work autonomously for 6 hours;
• if necessary, increase the output power of the device to 500 W, it is enough to connect additional external batteries;
• the adaptive output current control system allows the device to withstand short-term 16-fold overloads.

Author: Magomedov A.M.

See other articles Section Alternative energy sources.

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