1. «TENSY GROUP» Moscow, Russia
Energy Storage System
«TENSY GROUP»
Moscow, Russia

2. Energy Storage System (hereinafter ESS) is a system of two-way inverters (converters DC battery voltage to AC voltage and back again) and the rechargeable battery pack.
The system is constantly connected to the power grid to control the parameters of the mains voltage and synchronization with the grid. During peak-demand period when the load exceeds the rated capacity of the power grid, ESS begins to give the required energy to the grid (to the load). During off-peak period, batteries are charging.
ESS also allows:
to compensate for reactive power;
to compensate for harmonics of the load current;
to symmetrize phase voltage;
to adjust the frequency of the power grid.

3. Modes of operation: Energy storage mode
with batteries:
Energy storage mode
Mode of transfer of the electric power to the power grid
Adding power mode
Mode of autonomous power supply of loading
without batteries:
Mode of reactive power compensation
Mode of compensation of load current harmonics
Mode of balancing of interphase current

4. Energy storage mode
ESS switches to the energy storage mode if there is no need for a power output. When the electrical parameters are within the working range, ESS charges the batteries. The operator sets the value of power that is consumed from the power grid .

5. Mode of transfer of the electric power to the power grid
ESS goes to the mode of conversion DC to AC. AC voltage is synchronized in frequency, phase and instantaneous value of the voltage to the mains voltage. Output current of ESS is limited within specifications.

6. Adding power mode
ESS switches to the mode of power supply of load without output of energy to the power grid. Battery DC voltage is converted into AC voltage which is synchronized in frequency, phase and instantaneous value of the voltage to the mains voltage. In this case the output current of ESS is limited by consumption of the current of load.
In this mode, ESS measures the level of power consumed by the load. If it exceeds a predetermined threshold of consumption, ESS begins to add power corresponding to the difference between the predetermined threshold of consumption and consumed by the load.

7. Mode of autonomous power supply of load
ESS switches to the mode of off-line power supply of load with unplugging. ESS control system makes control of battery voltage and turns off the power output at low battery voltage to prevent deep discharge of batteries. In this case load will be plugged back to the mains, and ESS will switches to energy savings mode (if different algorithm of work of ESS is not specified by the operator).

8. Mode of reactive power compensation
ESS measures the mains voltage and the current consumed by the load and synthesizes such a form of output current that allows to compensate for the reactive component of power and suppress the higher harmonics of the load current. Stored in the batteries energy is not consumed.
1) voltage and current of load
2) voltage and current of load, and compensating current of ESS
4) Mains voltage and compensating power of ESS
3) voltage and current of load, and the resulting mains current

9. Mode of compensation of load current harmonics
ESS measures the mains voltage and the current consumed by the load and synthesizes such a form of output current that allows to suppress the higher harmonics of the load current. Stored in the batteries energy is not consumed .
1) voltage and current of load
2) rated values of load current harmonics
3) desirable current of compensation
4) desirable and actual current of ESS
5) voltage and compensated current of main
6) Rated load current harmonics and the compensated current of main

10. Mode of balancing of interphase current
When the load consumes a current from the power grid uneven, ESS switches to the balancing mode taking power from the underloaded phases and giving it to the overloaded phases. This Mode is exclusively due to the mains energy, without consuming of battery resources.
Phase 1 is underloaded. Phase 2 and Phase 3 are overloaded
Two-way inverter takes the current from Phase 2 and Phase 3 and gives it to Phase 1
Resulting current of phases

11. The combined operating modes of ESS are possible.
Combined modes
The combined operating modes of ESS are possible.
Switching between modes is possible by using the algorithm in an automatic mode or by the operator's command or by the programmed schedule. It can be controlled from the ESS control console or remotely by using:
Ethernet
GSM-modem
RS-232 ports
USB
Dry contact
Wi-Fi.

12. Thanks for watching