1. Overview

PAIO-(30-50)KW/(114-157)KWH container ESS(Energy Storage System) is a new energy power supply solution designed for areas without electricity. Photovoltaic system, Energy storage inverter PCS, LiFePO4 Energy storage system (BMS), Energy management system EMS, Internal air conditioning cooling system, Fire proof system, and Power distribution system are integrated in the container to become a mobile energy storage and all-in-one machinery, which can realize multiple work modes (off-grid , self-generation and self-consumption, surplus power to the grid) intelligent micro-grid system. PAIO has automatic retractable solar panels, which can be retracted and extended within 30 minutes. The system can be connected to an external 50KW diesel generator. PAIO is suitable for areas with abundant solar light.

Features

Extremely Simple

ALL IN ONE design, high integration, built-in force transmission device, saving time and labor

Modular installation, simple structure, easy maintenance and construction

Standard 20-foot container mobile design, easy transportation and flexible layout

Overall delivery, whole machinery transportation, easy installation and operation and maintenance

Power expansion and capacity expansion are achievable

Safe

Thermal runaway risk warning design concept

Fire proof: perfluorohexanone gas

BMS and EMS linkage protection to higher improved safety

Intelligent

Cloud platform management system, supports remote/local monitoring, intelligent cloud operation and maintenance without expert on-site maintenance

Intelligent balancing strategy, system AI warning, ensure the consistency of the battery throughout the life cycle

Support black start function, reliable power supply in both off-grid/on-grid modes

Stable

Dustproof and waterproof: IP54

Intelligent temperature control: industrial air conditioning, with cooling, heating, dehumidification, constant temperature, constant humidity and other functions

Relative humidity 5~95% without condensation

Working temperature -30℃~55°C

Altitude 3000M

Can operate stably under various harsh natural conditions such as plateaus and deserts

2. System Standards

GB/T 4942 Enclosure protection degree (IP code)

GB 2894-2008 Safety signs (ISO 3864:1984)

GB/T 50796-2012 Acceptance specification for photovoltaic power generation projects

GB/T 19964-2012 Technical regulations for photovoltaic power station access to power system

GB 50217-2018 Power engineering cable design specification

GB/T 50054-2011 Low voltage power distribution design specification

GB/T 50065-2011 Grounding design specification for AC power devices

GB/T 36276-2018 Lithium-ion batteries for power storage

GB/T 34133-2017 Technical regulations for energy storage converter detection

3. System Technical Parameters

Figure 1: PAIO-(30-50)KW/(114-157)KWH System Expansion Diagram

1.PAIO-(30-50)KW/(114-157)KWH container energy storage system parameters: Table 1

Figure 2: Partial diagram of PAIO-(30-50)KW/(114-157)KWH container energy storage system

Figure 3: Top view of PAIO-(30-50)KW/(114-157)KWH container energy storage system

1.1 PV Panel Parameters

High efficiency: Module efficiency reaches over 21%. It can still work in low sunshine conditions. Foggy and cloudy days do not affect the power generation efficiency.

Reliable: The design life is more than 25 years, revolutionary packaging technology, long-lasting bonding, and the firmness is comparable to the building curtain wall. It has excellent mechanical load capacity, has passed the salt spray and other weather resistance tests and enhancements, and can withstand 2400pa wind load and 5400pa snow load.

Environmental protection: no pollution.

Easy to maintain

LF460M10-60H parameter table: Table 2

Figure 4: Solar panel dimensions

Figure 5: Solar Panel Photo

1.2 Energy Storage Inverter

Adopt three-phase high-voltage energy storage inverter

4-way MPPT and 8 strings of 20A single string current, up to 96kW photovoltaic input

Dual-way battery port provides maximum 140A/70+70A charge and discharge current

Support 160%/2s rated power load capacity of Backup port

Support 6 devices in on-grid and off-grid conditions

Support direct operation as on-grid inverter without battery

Support two generator access methods, with remote control start and stop function

Support peak control in self-generation and self-use mode and generator mode

1.3. Battery Grouping Solution

A high-capacity, high-safety, long-life lithium-ion battery for energy storage developed based on more than ten years of core intellectual property and technology accumulation in lithium iron phosphate and related materials. It has the characteristics of good cycle life, large single-cell capacity, high safety, high consistency, and its performance indicators in all aspects have reached the international leading and domestic advanced level.

Table 4

Battery Module Parameters

The battery adopts a highly integrated standardized module, which is convenient for debugging and installation. Each standard box has 16 strings of batteries, 51.2V/280Ah.

The box can be installed with a fan for more effective heat dissipation.

The BMS can automatically control the fan according to the temperature.

Table 5

Battery cluster/system assembly

The battery box is installed on the battery rack. The entire battery rack is welded with high-strength, thickened square steel, which is wear-resistant, corrosion-resistant and fire-resistant. The box surface is fully sprayed with insulating paint to effectively improve the insulation level. The box adopts an insulated closed installation, which can effectively prevent dripping water and dust from falling into the battery pack and has good heat dissipation performance. The system is divided into 1 cluster, which is neatly and evenly distributed on both sides of the energy storage cabinet. Each cluster of batteries consists of 8 standard battery boxes and 1 high-voltage box. The battery warehouse mainly includes battery packs, battery racks, BMS control boxes, cooling fans, etc. The battery needs to be equipped with a corresponding BMS management system. The type of battery is iron-lithium battery. The heat dissipation air conditioner is adjusted in real time according to the temperature in the warehouse.

Table 6

Figure 8: Schematic diagram of battery system assembly

1.4 Thermal management and air conditioning parameters

The Energy Storage cabinet is equipped with an air conditioning cooling system and a cooling duct to control the temperature inside the energy storage cabinet.

The air conditioning system is connected to the battery management system (BMS) through the RS485 communication protocol.

In addition to realizing the linkage between the air conditioning and the fire protection system, the BMS should also be able to set the air conditioning start-up cooling point, cooling deviation, start-up hot point, heating deviation, battery cell temperature start-up cooling point, battery cell temperature start-up hot point and other parameters.

It has the function of manually starting the air conditioning operation and being able to control the air conditioning according to the battery cell temperature. The set battery cell temperature start-up cooling point and battery cell temperature start-up hot point parameters do not need to be sent to the air conditioning system. They are only the thresholds for the energy management system to control the air conditioning operation according to the battery cell temperature.

When the BMS detects that the battery temperature reaches a certain limit value, the BMS sends a command to the air conditioning system to control the air conditioning system to start running and control the temperature of the energy storage cabinet system within the appropriate temperature.

In the outdoor natural environment, the temperature and humidity in the energy storage cabinet can be adjusted, and the control and adjustment parameters are as follows: When the battery compartment is in operation, the temperature in the battery compartment is controlled within 35°C, the temperature difference in the local position is less than 5°C, and the humidity in the compartment is controlled within 70%.

Air Conditioner Parameters: Table 7

1.5. Battery Management System

BMU Battery Module Management Unit (Level 3)

Responsible for collecting real-time information such as voltage and temperature of battery modules. At the same time, it performs equalization management, online detection, fault diagnosis, etc.

SBCU Battery Cluster Management Unit (Level 2)

Responsible for managing a cluster of battery packs, collecting battery operation information, fault diagnosis and alarm, battery equalization strategy analysis SOC calculation, insulation detection, relay adhesion detection, control of related relays, data communication interaction with BMU, etc.

MBCU Battery System Management Unit (Level 1)

Responsible for the management of the overall battery system. Complete battery status collection, analysis, monitoring and scheduling; battery system SOC, SOH calculation; system fault diagnosis and alarm; system power on and off and charge and discharge strategy management; and touch screen PCS/EMS data interaction.

Realize battery information display, provide a friendly manual operation interface, can easily help maintenance personnel locate problems, and provide an operation interface.

1.6 Energy management systems

The energy management system is an important part of the control system, which provides data management, monitoring, control and optimization for the scheduling control center to ensure stable and efficient operation of the system. The energy management system provides power and voltage set points for each distributed energy controller within the system; ensures that the demand for heat and electricity loads in the system is met, and ensures that the system meets the operating protocols with the main grid system; and minimizes energy consumption and system losses as much as possible.

The system is capable of real-time and timed data acquisition of all monitored operating parameters and statuses. All electrical quantities are sampled by AC and high accuracy and speed are guaranteed, and important historical data are processed and stored in the database.

Acquire the total voltage, current, average temperature, SOC, SOH, charging and discharging current and power limit, single battery voltage, single battery temperature, equalization status of each battery, fault and alarm information, historical charging and discharging power, historical charging and discharging power, and other commonly used information of each group of batteries of BMS system. Collect relevant parameters of the PCS system, including DC voltage/current/power, three-phase active power, reactive power, three-phase voltage, three-phase current, power factor, frequency, IGBT temperature, RC filter temperature, operation status, alarms and faults and other commonly used information, as well as daily input power, daily output power, cumulative input power, cumulative output power, and so on.

Collects and displays various status quantities of the energy storage system, including the main circuit status (switch, accident trip signal, protection action signal, and abnormal signal), fire alarm, temperature development and other information.

Figure 12 Energy overview (early data)

Figure 13. General overview of enterprise project operations (early data)

1.7, Reducer drive unit

Reducer shell adopts casting process; high torque, low distribution speed, one side stroke up to 1.5 meters/minute, can finish putting away and putting away in 30 minutes (calculated according to one side 40 meters).

Figure 15 Top view of reducer

4. List of main devices of the system.Table 9