Micro-Grids solution for Solar- Zhejiang Yongtailong Electronic Co., Ltd

A. Pain points analysis:

A.Pain points analysis

1. Illumination: Residents unable to read, study, or perform housework, reducing quality of life without electricity power supply.

2. Dysfunction of household appliances: Appliances like refrigerators, TVs and others appliances which depending on power supply can not function normally, impacting food storage, entertainment and increasing housework.

3. Water supply disruption: Electricity-dependent water systems result in water outages, affecting residential and even centralized water supplies.

4. Heating/Cooling challenges: No electricity means no electric heating in winter or air conditioner in summer, posing health risks.

5. Communication barriers: Electricity powers modern communication tools, hindering access to information and effective communications.

B. System structure introduction:

‘Zhidian Micro-grids solution’ - solar power distribution is a system of “Internet + solar power generation + an integrated system for prepaid electricity sales”. On the power generating side, the System operates real-time monitoring, control and comparative analysis, providing the owners all complete&clear data for the whole system’s positively operation. The better management system is, the better service for our customers. The whole system has high reliable performance, long service life, no pollution to the environment, and can generate electricity off the grid. Electricity sales can be paid for by customers online or offline.

C. Functions introduction

1.User-friendly interface and mobile APP support:

Providing Web client and mobile APP client access mode, convenient for users checking power station status at anytime and anywhere, receiving alarm reminders, and executing remote control commands.

2.Profile of stations:

Display detailed information of each distributed photovoltaic site, including geological location, installed capacity, historical power generating records and etc.

3.Real-time data collection and demonstration:

Real-time monitoring and recording operation parameters from all equipment in photovoltaic power station, for example voltage, current, power output from photovoltaic sets., environment temperature, sunlight intensity and etc. According to the data mentioned upon, forming all kinds of statistical forms. Day/Month/Year statistics of total power generation, comparative analysis of power generation efficiency and equipment performance evaluation.

4.Remote control and optimized management:

Users are able to adjust the work mode via Cloud remote control managing power station equipment for better power generating efficiency and sunlight use ratio. With remote control, we can realize the remote power on/off on the key equipment like inverter, parameter setting changing and etc.

5.Intelligent malfunction early warning and diagnostic:

Automatically recognize and rapid responding to unexpected exceptions in the system, such as malfunction on inverters, over-voltage, under-voltage, over-temperature and etc. It informs users by sending them message, E-mails or by APP. Also it will remotely analyze the failure cause and provide the initial diagnostic report&maintenance proposal.

6.Safety and authority managements

Multilevel authority limits setting, users with different roles can view and operate different function modules. Data encrypted transmission and storage, securing the safety of data from running power stations.

In summary, the intelligent photovoltaic monitoring and operation cloud platform is a key tool for efficient operation and maintenance of photovoltaic power plants. It integrates various functions such as automated monitoring, intelligent diagnosis, and data analysis, effectively improving the operation and maintenance efficiency and economic benefits of photovoltaic power plants.

D. Devices Introduction

Solar module：530W/540W/550W/570W/610W
Product model	JKM570N
	STC	NOCT
Maximum power(Pmax)	570Wp	429Wp
optimum operating voltage(Vmp)	42.07V	39.51V
Optimum operation current(Imp)	13.55A	10.85A
Open-circuit voltage(Voc)	50.74V	48.20V
Short-circuit current(Isc)	14.31A	11.55A
Component efficiency(%)	22.07%
Working temperature range(℃)	-40℃~+85℃
Cell type	N-type single crystal silicon
junction box	IP68

Inverter:30KW/50KW/110KW/175KW
Product model	MAX 110KTL3
Data input（DC）
Maximal input voltage	1100V
Minimum input voltage	200V
Maximum input current of each MPPT	32A
Maximum short-circuit current of each MPPT	40A
Data input（AC）
rated output power	100KW
Maximum output current	158.8A
Connection to power grids	3W/N/PE
Rated output voltage	230V/400V

Transformer：100kVA/200kVA/315kVA/630kVA/1000kVA
Product Model	SCB18-315/10
Rated voltage	10/0.4kV
Capacity	315kVA
short circuit impedance	4%
voltage regulating mode	No-load
Voltage regulating range	±2*2.5%
Connection group	Dyn11
Center point grounding mode	No connection to ground

PCS：100kVA/250kVA/500kVA
Product Model	PWS1-250K
DC Side Specification
maximum DC power	275kW
DC voltage range	600~900Vdc
Number of DC access channels	1/4
Maximum DC current per channel	440/110A
AC Side Specification
Rated Power	250kVA
Connection mode	Three phase four wire
Allowed power grid voltage	380/400(-15%~15%)Vac
Allowed power grid frequency	50/60(-2.5~2.5)Hz

Storage Battery:100kWh/215kWh/430kWh/600kWh
Product Model	FRBESS-215KWH
DC Side Specification
Maximum DC voltage	LFP3.2V/280Ah
DC voltage range	560~817.6V
Battery PACK setting	14.336kWh/1P16S
Battery system setting	215kWh/1P240S
AC Side Specification
Rated Power	100kW
Max.Power	120kW
Rated Voltage	380V
Rated power grid frequency	50Hz

Diesel generator：20kW/50kW/100kW/200kW/500kW
Product model	DC-100GF
Prime power	100kW
Prime power	125kVA
Output Voltage	230/400V
Maximum Output Current	180A
Frequency	50HZ
Rated Speed	1500（r/min）
Phase/wire	Three-phase four-wire
Power factor	0.8
Fuel Consumption at 100%	≤210g/(kW·h)

E. Applied Scenarios


Centralized power generation	Centralized power generation

Indoors illumination	Daily household appliance

School dorms	Residential zone

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