AUSTEM ESS 3kW 설치 및 운영 매뉴얼 - 페이지 14

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4.3 Detail of function

◐ MPPT(Maximum Power Point Tracking) control and operation method

• The output characteristics of the PV cell change according to the surrounding temperature, humidity, and

the amount of sunlight radiation. So that, PV cell operates with the MPPT control, and the PV cell starts the

MPPT DC-DC converter at the PV power rated voltage. When the voltage is reached at Maximum Power

Point, MPPT DC-DC converter is stopped.

•

There are automatic mode and manual mode for operation. In automatic mode, ESS operates automatically

by detecting the voltage of PV cell. In addition, inverter operates and stops automatically from voltage of the

PV cell. In this mode, inverter start to operates at sunrise and stops at sunset.

• During discharge, output of ESS is would be maximum power of discharge and power from PV cell. But,

power from PV cell control power of discharge.

• After power of PV cell is produce to load, then charge battery.

•

During charge, battery is charged by receiving power from the grid. If there is electricity generated from the

PV cell, it will be used to charge the battery. If PV power still remains, it will be discharged through the ESS.

•

The current which generated by the solar cell is limited to the set maximum PV power.

• The maximum limit value of DC-Link for maximum solar cell voltage and maximum power point tracking

limited by below the set DC over-voltage.

•

Total PV power generation is cumulatively recorded.

Battery voltage control

◐

•

Battery is charging with the maximum charging current, up to the maximum charging voltage with constant

voltage - constant current charging.

•

When the battery discharges to the minimum discharge voltage during discharging, it stops ESS and

generates low voltage signal.

◐ Line monitoring

• Judgement about normal or abnormal of line voltage is determined as Line-over-voltage at high voltage

with voltage difference from normal voltage, and Line-under-voltage at low voltage, and make ESS is stop

• If the frequency of the Line voltage falls outside the upper(Line over-frequency) and lower(Line under-

frequency) limits with the specified value(Line frequency), ESS would be stop.

• In order to operate power generation in the normal line condition, it is operated after the line transfer time

has elapsed.

• Fault voltage time indicates the voltage response time of the over-voltage or under-voltage protection of

the grid voltage. Also, Fault frequency time indicates the frequency response time of the over-frequency or

under-frequency protection of the grid frequency.

• Anti-island speed is a function that adjusts the degree of frequency deviation in the independence

prevention function. It can control the fault frequency time and the independence prevention time. If Increase

this value, stand-alone operation prevention time would be short.

• In order to control the power factor during system operation, it can be controlled through phase shift.

◐ Fine calibration