This is an extension of the original FUEL SAVE system from 2015. Both FUEL SAVE systems (containers) are interconnected to the main circuit breaker to connect the PV input in the substation. The communication is done by the communication link between control cabinets (DT1, DT2) in both containers. COMAP InteliGen NT control systems for the control of diesel generators in the substation are interconnected on the communication bus to the InternetBridge-NT communication module, which is connected to the control system in the DT1 switchgear over Ethernet. Through the InternetBridge-NT module, it is possible to visualize the parameters of each connected GENSET and to set them remotely.

Fuel save system is installed in autonomous grid systems in remote area. Main source of energy are diesel gensets. To reduce the high fuel costs, a PV power plant has been built. PV power plant is very suitable and economically viable, because it is a very sunny region. To enable safe and reliable operation with the gensets, a special inverter software and control system have been designed.

The device can supply the electricity to the grid even during a minimum flow of water, with high quality of current: (cos φ = -1, the current THD 5%). The device is equipped with an emergency electro-hydraulic. The generator is connected to the screw turbine via a gear. The level of the water is detected by an ultrasonic level sensor and locks level are automatically controlled by DC drives. DC drives have backup power from a battery that is recharged by FOTO CHARGER DC 48 charger. Automatic control system is provided by the control system. The system evaluates generator bearing temperature, transmission oil temperature, bearing temperature turbine position locks using limit switches, water level of the river. The entire system is monitored remotely via eWON industrial router.

Hybrid PV system is able to operate in three different modes: 1.Automatic mode: - when the mains voltage is available, inverters are working in on-grid mode, and the consumption of the building in the point of coupling to the mains is measured. According to the consumption, the power of the inverters is controlled to achieve the zero grid injection. When there is a failure in the mains grid, the PV system smoothly enters the off-grid mode and the line monitoring relay disconnects the house from the grid. After restoring the proper voltage in the grid, PV system smoothly switches to on-grid mode. 2. Off-grid: In this mode, the PV system operates in the off-grid mode independently of the conditions of the mains grid. 3. On-grid, inverters off: This is the mode when the system is avoiding the invertes - inverters are off, line monitoring relay is always on, despite the condition of the grid. Basic technical voltage: Input voltage system: Rated battery voltage: 48V DC Rated PV panel voltage: 350V DC AC mains: 1/N/PE ~ 50Hz 230V/TN-S Output voltage system: 3/N/PE ~ 50Hz 230V/TN-S 1/N/PE ~ 50Hz 230V/TN-S Rated inverter output current: INOM=8,7 A ~ AC Max. inverter output current: IMAX=15A ~ AC Control voltage: 24V DC Protection: IP 54/20 (Enclosure/Inverter)

Power Factor Correction of PVP is solved by installation of 2 pcs of active compensating units "UNIKOMPENZATOR 400" in accordance with the requirements of the distribution grid. It helps to maintain the desired power factor (cos φ) over the entire photovoltaic supply of reactive power (inductive or capacitive nature) of the distribution network. Standard regulatory scope of the entire PV power factor can be adjusted in the range from 0.95 to 0.95 capacitive inductive. Power factor setpoint is requested from the distribution grid in 5 steps. Both compensation units are connected to the 0.4 kV side of the grid transformer 0,4 / 22 kV. Measurement of current and voltage signals (for transmitter phase angle cos φ) is performed directly on the HV side and also serve as a feedback controller.

In a separate, ventilated kiosk there is an enclosure for FVE1 and the battery. Two air-conditioned enclosures for FVE2, FVE3 and their batteries are installed in the second separate ventilated kiosk. FVE1 is a three-phase photovoltaic system, FVE2 and FVE3 are single-phase photovoltaic systems designed to generate energy for a refugee camp in Iraq. Enclosures of FVE1, FVE2, FVE3 operate in two modes - AUTOMATIC mode or GRID mode. In AUTOMATIC mode, the appliances are fed from battery-powered inverters in off-grid mode. The battery is automatically charged and battery parameters - voltage and the temperature of cell section are constantly measured and monitored by the Battery Management System. With long-term low sun light and battery capacity drop to a critical level, control system switches the supply of appliances to the distribution grid. When the conditions of the control system are met again, the off-grid mode is enabled. In the GRID mode, all appliances are supplied exclusively from the distribution grid. The touch screen on the door of each enclosure offers possiblity of parameters adjusting, display of alarms, system diagnostics and system status. The power of each of FVE1, FVE2, FVE3 is complemented by a complete monitoring, web visualization of the statistics and archive of the overall energy production.

Custom designed laboratory for East Slovakian distribution company and Technical university of Kosice. User can adjust the voltage, frequency and the load impedance to test the behaviour of different PV systems.

This is a project made upon a special request from the customer. It involves two kinds of inverter - PV panel fed for on-grid operation and 48V battery fed for hybrid operation. The hybrid inverter serves mostly for self-consumption covering late in the evening and during the night. On-grid inverter is user for self-consumption cover during the day. The surplus energy is used for battery charging. All process is designed to minimize the grid dependency, to maximize the energy usage. Control algorithm is implemented in VONSCH RM-WEBi system. Priorities on energy usage can be adjusted by the end user.

GSE CONTROL is made for minimization of grid power flow for the objects equipped with own energy source (PV or other power plant) and having a significant own consumption. The GSE CONTROL evaluates S0 outputs from the energy meter connected to the point of common coupling. GSE CONTROL automatically controls the energy flow between the battery and the three phase AC grid. There are several basic modes: battery charging (from the energy surplus), battery discharging (own consumption cover), equalized charging. Batteries are not the part of delivery.

The single-phase photovoltaic hybrid system with the household consumption covering feature was installed. In case of power failure and sufficient battery capacity, the plant is able to backup the appliances in the one phase - inverter instantaneously and smoothly enters off-grid mode.

The need to reduce the cost of the house and feed the electricity surplus into the grid, the need for remote monitoring of the inverter + status messages over e-mail was addressed as follows: Inverter FOTO CONTROL 230 / 375 DC operates in on-grid mode. RM WEB module is used for the monitoring of the power plant.

FOTO CONTROL 1f 230/375 DC inverter is used as an electronic MPPT controller of AC coil power. This solution increases the energy yield by 30-40% comparing to the standard switch. In addition to this, automatic switching of external load after exceeding preset power is possible. .