NB/T 32012-2013Technical Specification for Solar Energy Resource Real-time Monitoring of Photovoltaic Power Station (English PDF)

3.1 Photovoltaic (PV) power station

The generating system that uses the photovoltaic effect of photovoltaic cell and directly converts solar radiation energy into electrical energy. Generally it includes transformers, inverters and PV array, as well as related auxiliary facilities, etc.

3.2 Direct normal irradiance

Irradiance on a plane that direct solar radiation is perpendicular to the beam.

3.10 Diffuse irradiance, scattering irradiance

In addition to the contribution of direct irradiance, it is the radiant flux irradiating to unit area from sky.

3.11 Global solar irradiance

It is the total solar radiation flux of incidence on the horizontal surface of unit area, also known as total radiant emmittance.

3.12 Sunshine duration

It is the sum of time interval that direct solar radiation irradiance is greater than or equal to 120W/m², also known as sunshine duration.

3.13 Duration of possible sunshine

Without any shadowing conditions, when the center of the sun enters from eastern horizon into western horizon in the place, it is the time of light reaching the ground.

5.1 Total irradiance

c) Measurement accuracy. less than 5%.

d) Working environment temperature. -40 °C ~ + 60 °C.

5.4 Sunshine duration

Use heliograph to observe. Sunshine recorder accumulates automatically the sunshine duration of the day, the unit is h. Observations of heliograph shall meet the requirements of QX/T 56. The technical parameters required are as follows.

a) Measuring range. 0 ~ 24h;

b) Measurement accuracy. less than ± 0.1h;

c) Resolution rate. 0.1h;

d) Working environment temperature. -40 °C ~ + 60 °C.

5.5 Wind speed

Use wind speed sensor to observe. The wind speed sensor samples once per second, and automatically calculates and records the arithmetic mean wind speed every 5 minutes, the unit is m/s. The technical parameters of wind speed sensor are as follows.

a) Measuring range. 0m/s ~ 60m/s;

b) Measurement accuracy. ± 0.5m/s (3m/s ~ 30m/s).

c) Working environment temperature. -40 °C ~ + 60 °C.

5.6 Wind direction

Use wind direction sensor to observe. Wind direction and wind speed are synchronous acquisition. Automatically calculate and record vector average wind direction every 5min, the unit is (°). The technical parameters of wind direction sensor are as follows.

a) Measuring range. 0 ~ 360 °;

b) Measurement accuracy. ± 5 °;

c) Working environment temperature. -40 °C ~ + 60 °C.

5.7 Environment temperature

Use thermometer to observe. The thermometer samples once every 10s, and collects 6 samples every minute. Delete 1 maximum and 1 minimum; the arithmetic average of the remaining four samples is the instantaneous value of the minute.

d) Check whether the shading of scattered radiation meter completely shade the sensing surface and the glass cover of instruments, or adjust immediately.

8.4 Data format

The specific data format of recorded and transmitted measurements is described in Table 1. […]