100kW on Grid Solar Energy System

100kW on Grid Solar Energy System

1. Project location analysis

The project uses photovoltaic grid-connected power generation system design, the application category for the village-level photovoltaic power plant project. The project is installed in Hunan, Hunan is located in the southeast of China. Is located between latitude 24 ° 29'-30 ° 04 ', longitude 113 ° 34'-118 ° 28'. The location of the project is latitude 25 ° 8 'north latitude, 114 ° 9' east longitude. According to the latitude and longitude of the query on the NASA query the local peak sunshine time is as follows:

2. PV modules

2.1 Selection of PV modules

The project uses polysilicon solar panels, single power of 260Wp. The following is a set of polysilicon performance parameters, component size is 1650 * 990 * 35mm.

2.2 PV module installation angle

According to the location coordinates of the project, the coordinates of the project location are 25 ° 8 'north latitude and 114 ° 9' East Longitude. The optimum inclination angle of the PV module is 20 ° as shown below:

2.3 component array spacing and project installation area

Using 260Wp components, component size 1650 * 990 * 35mm, sharing 400 solar panels, the total power of 104kWp. According to the following table formula can be calculated before and after the array spacing of 2.4m, monolithic components and their space occupied by the area of 2.39 square meters.

104kWp PV modules composed of photovoltaic grid-connected power generation system covers an area of 2.39 * 400 = 956 square meters, taking into account the installation gap, the surrounding walls and other possible area, about 1,000 square meters.

3. Photovoltaic stent

The project is a horizontal ground installation, the use of self-weight bracket installation. The self-weighting solution is suitable for flat roof and ground systems. The use of cement blocks to suppress the bottom of the aluminum tray tray, play a fixed system role.

4. Photovoltaic inverter selection

The photovoltaic power generation project is a grid-connected photovoltaic power generation system, the inverter uses a group of grid-type grid-connected photovoltaic inverter. Considering the distribution of construction sites, the degree of technical maturity, the stability of power generation, the matching with PV modules and the market price, the three-crystal electrical model is Suntrio Plus 33K 33kW three-phase grid-connected inverter, the whole PV system uses three inverters Device.

Sanjing electrical model for the Suntrio Plus 33K 33kW grid inverter appearance as shown below:

5. Cable selection

DC side cable: the use of photovoltaic certification dedicated cable, diameter 1 * 4mm ². Mostly for outdoor laying, need moisture, sunscreen, and cold, anti-ultraviolet and so on.

AC side cable: wire diameter selection 4 * 16mm² + 1 * 10mm ², mainly used for inverter AC side to the exchange of communication box or exchange cabinet, not only need to moisture, sunscreen, cold, anti-UV, but also consider fire and anti-rat anti-ants and so on.

6. Exchange convergence box selection

The configuration of the distribution box generally includes the busbar (label 1), the current transformer (label 2), the lightning arrester (label 3), the open (label 4), the current / voltmeter (label 5), the circuit breaker 6) composition.

Model generally select the inverter maximum AC output current of 1.25 times, 33kW three-phase inverter maximum current of 50A, so choose the rated current of 63A circuit breaker (open). 3 rated current of 63A small circuit breaker to the total circuit breaker, the total circuit breaker selection 200A specifications. Lightning protection of secondary surge protector, the specific specifications for the Uc: 460V, Imax: 40KA, In: 20KA, Up ≤ 1.8KV.

7. Access program

7.1 System plan design

The distributed grid-connected design scheme divides the 100kW system into three 33kW grid-connected power generation units, and connects to the AC power grid through three sets of SuntrioPlus33k (33kW) grid-connected inverter to realize grid-connected power generation.

The system access plan is as follows:

7.2 Device Configuration List

8. Income calculation

8.1 Estimation of power generation

According to the previous section of the project to install Hunan solar energy resources analysis, we can see that Hunan's peak sunshine time is 1244.65 hours.

From the table can be estimated 104kW system 25 years can accumulate about 226.6 million degrees of power generation.

8.2 Benefit Analysis

Assuming the cost in accordance with 8 yuan / W to count, the entire photovoltaic system to spend 832,000 yuan. The income per kWh in accordance with the 0.98 / degree (national electricity subsidies + provincial and local subsidies + electricity price) get the following table of data:

Analysis of economic benefits: PV system in the first 25 years the average annual generating capacity of about 226.6 million degrees, the first 8 years total generating about 769,000 degrees, according to electricity 0.98 yuan, the first 8 years can produce economic benefits of 754,000 yuan, the first 25 years can produce economic benefits 22.21 million yuan. About nine years to recover the cost of 25 years, the total income of 22.21 million yuan, excluding costs, net income of up to about 1.39 million yuan. (Due to differences in annual electricity generation, system costs and subsidies, the finalized earnings data are for reference only.)