measurement: watt (W), kilowatt (KW), megawatt (MW), gigawatt (GW), terawatt (TW). Calculation formula: 1TW = 1000 GW = 1000000MW = 1000000000KW = 1000000000000 W1MW = 1000KW Electric energy unit: Kilowatt-hour (KWh) means that the electric energy of 1 KWh is 1 kilowatt-hour. Inverter: It is one of the key equipment in the solar photovoltaic power generation system. Its function is to convert the direct current generated by the solar cell into alternating current that meets the power quality requirements of the grid. String inverter: The string inverter tracks the maximum power peak value of several groups (generally 1-4 groups) of photovoltaic strings separately, and then integrates them into the AC power grid after inversion. A string inverter can have multiple maximum power peak tracking modules, and the power is relatively small. It is mainly used in distributed power generation system and centralized photovoltaic power generation system. Installed capacity: The solar cells are packaged and protected after being connected in series to form a large-area solar cell module, and the photovoltaic power generation device is formed with the power controller and other components. The power generated by this device is the installed capacity. Capacity ratio: the ratio between the module capacity and the inverter capacity of the PV power station . (Capacity ratio = installed capacity of PV system /rated capacity of PV system). Properly increasing the capacity ratio within a certain range can improve the utilization rate of other equipment, dilute the investment cost, reduce the construction cost and power generation cost, make the output smoother, and improve the grid friendliness. AGC: Automatic Generation Control, namely the active control system, which receives the signal from the remote control device, responds to the remote control instruction issued by the dispatcher, and optimizes the calculation through the total strategy of the AGC module. Make the operation data meet the requirements of dispatching and grid connection. AVC: Automatic Voltage Control, that is, reactive voltage regulation, according to the grid voltage curve, rapid response to dispatching instructions, automatic regulation of reactive power, reactive power compensation devices and other control strategies and response time. Achieve the goal of voltage regulation and reduce network loss. Calculation formula
of photovoltaic power generation system 1. Conversion efficiency
η = Pm (peak power of the cell)/A (cell area) × Pin (incident light power per unit area)
, where: Pin = 1 KW/㎡ = 100m W/cm ².
2. Charging voltage
Vmax = V × 1.43 times
3. Series and parallel connection
of battery modules 3.1 Number of parallel connection of battery modules = average daily power consumption of load (Ah)/average daily power generation of modules (Ah) 3.2 Number of
battery modules in series = system operating voltage (V) × coefficient 1.43/module peak operating voltage (V)
4. Battery capacity
Battery capacity = daily average power consumption (Ah) × continuous rainy days/maximum depth of discharge
5. Average discharge
rate Average discharge rate (H) = continuous rainy days × load working time/maximum depth of discharge 0 HTML 0 UNK3 8 6.Load Working Time 0 HTML 0 UNK3 9 Load Working Time (H) = ∑ Load Power × Load Working Time/∑ Load Power 0 HTML 0 UNK4 0 7.Battery 0 HTML 0 UNK4 17.1 Battery Capacity = Average Load Power (Ah) × Days of Continuous Rain × Discharge Correction Factor/Min. Large depth of discharge × low temperature correction factor 0 HTML0 UNK4 27.2 Number of batteries in series = system operating voltage/nominal battery voltage 0 HTML0 UNK4 37.3 Number of batteries in parallel = total battery capacity/nominal battery capacity 0 HTML0 UNK4 48. Simple calculation based on peak sunshine hours 0 HTML0 UNK4 58.1 Component power = (power of electric appliance × power utilization time/local peak sunshine hours) × loss coefficient 0 HTML0 UNK4 6 Loss coefficient: 1.6 ~ 2.0 according to local pollution level, line length, Installation angle, etc. 0 HTML0 UNK4 78.2 Battery capacity = (power of electrical appliance × power consumption time/system voltage) × continuous rainy days × system safety factor 0 HTML0 UNK4 8 System safety factor: 1.6 ~ 2.0, According to the depth of discharge of the battery, winter temperature, Inverter conversion efficiency, etc. 0 HTML0 UNK4 99. Calculation method based on total annual radiation 0 HTML0 UNK5 0 Component (square matrix) = K × (working voltage of electrical appliances × working current of electrical appliances × power consumption time)/total local annual radiation 0 HTML0 UNK5 1 Maintenance + general use. K is taken as 230: no maintenance + reliable use, K is taken as 251: no maintenance + harsh environment + very reliable requirements, K is taken as 2760HTML0 UNK5 210. Calculation based on annual total radiation and slope correction coefficient 0 HTML0 UNK5 310.1 Array power = coefficient 5618 × safety factor × total load power consumption/slope correction coefficient × annual average radiation in horizontal plane 0 HTML0 UNK5 4 Coefficient 5618: based on charging and discharging efficiency coefficient , component attenuation coefficient, etc.: Safety factor: take 1.1 ~ 1.30 HTML0 UNK5 5 10.2 Battery capacity = 10 × total power consumption of load/system working voltage according to the use environment, whether there is a standby power supply, whether there is a person on duty, etc.: 10: No sunshine coefficient (applicable to continuous rain not exceeding 5 days) 0 HTML0 UNK5 6
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