DC Power System With Parallel Batteries-DC Power System-Ontech Electric Corporation

DC Power System With Parallel Batteries

Product Categories:DC Power System

Product Description:DC power system employs parallel-battery design. Single battery is checked automatically in energized state for capacity, and it realizes maintenance-free DC power. System reliability will not be affected by the failure of a single battery. The system supports new & old batteries of different brands to be used and mixed up, and the single battery is replaced only as required, which greatly improves the battery’s utilization and reduces the environmental pollution. The layout is distributed, and...

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Functional characteristics

GQH-PB DC Power Supply System with Parallel Batteries

Product introduction:

DC power system employs parallel-battery design. Single battery is checked automatically in energized state for capacity, and it realizes maintenance-free DC power. System reliability will not be affected by the failure of a single battery. The system supports new & old batteries of different brands to be used and mixed up, and the single battery is replaced only as required, which greatly improves the battery’s utilization and reduces the environmental pollution. The layout is distributed, and greatly meets the demand of new generation substation’s construction.

Smart parallel battery module is designed innovatively by a single battery cell, matching AC/DC charger module, DC/DC boost module and other components ,and it meets the actual demand of multi-parallel battery modules, replacing the traditional charger module, storage batteries, battery inspection device in substation design.

Parallel battery solves the problem as outlined below: a single battery quality and wiring connection affects reliability of the entire battery pack when the storage battery is in series, which can’t be replaced and maintained under live electricity, difficulty in matching old and new battery, redundancy configuration cost a lot.

Working Principle

Single- phase AC power input of the module is transformed into 400V DC via EMI filter circuit and PFC (power factor correction) circuit. The bidirectional DC/DC converter transmits power between 400V busbar and 12V storage battery. DC/DC converter converts 400V DC voltage to DC220V/DC110V voltage output. It supplies loading service, and the circuit monitors and controls the whole converter, where it sends all kinds of signals and commands with monitoring module.

Specifications:

Model	IPM-PB22002	IPM-PB11004
Power (VA/W)	500	500
AC input characteristics
Rated input voltage	220Vac single-phase
Rated operating frequency	50Hz
Input voltage range	150V~295Vac
Input frequency range	49 HZ~55 HZ
Max. AC input	8.5A
Current input/output characteristics
Battery input voltage	10.8Vdc~14.1Vdc
Battery input current	0~50A
Charging voltage output	8 ~ 15Vdc continuously adjustable
Charging current-limiting output	0~20 continuously adjustable
Charging voltage ripple	≤120mVp-p
Output characteristic
Rated output voltage	220Vdc	110Vdc
Rated output current	2A	4A
Max. power output	200ms: 3300W; 60s: 1100W
Module starting time	3~8S
Total regulation	≤±0.5%
Dynamic regulation	Range ≤±5%, recovery time ≤100mS
Output ripple	Effective value ≤0.5%, peak to peak value ≤1%
Power	≥85%
Power factor	>0.95

Application Value

1. Improve DC system reliability.
Avoid affecting reliability of the entire battery pack when single battery fails.

2. DC system can be maintained in energized state.
Support users to replace or maintain a single battery among multi-parallel batteries in energized status, to charge and to discharge a single battery under live electricity.

3. Save money on power station resources.
(1) The parallel battery pack can replace traditional charging module, battery pack, and battery inspection device, greatly cutting expense on equipment.
(2) Both the number of required cabinets and installation area are reduced, saving money on infrastructure.
(3) DC system can be maintained in energized state, saving money on secondary maintenance.
(4) Parallel batteries communicate over a network, saving expense on management.

4. Realize the friendly environmental design of power supply
The number of lead-acid batteries is greatly reduced. It is predicted that twenty 12V/200AH parallel lead-acid batteries supply the same power capacity as two hundred and eight 2V/200AH lead-acid batteries do. Experiment shows that parallel lithium iron phosphate batteries contribute more to the friendly environmental design.

5. Substation’s power design reaches the industrial level.
The parallel battery module is a high integration of AC/DC, DC/DC, microelectronic technology, and communications technology, as well as a standardized design, greatly boosting substation’s power design to an industrial level.

6. Promote development of smart grid and smart substation.
(1) Information digitalization and smart management meet the development of smart grid and smart substation. Parallel and smart battery module supports digitalized transmission both in upstream and downstream directions. Battery capacity can be checked in energized state.
(2) Flexibly employ the technology of parallel battery module, and will promote development of smart grid and smart substation. On-site installation is distributed compartment by compartment in combination with the protection & test equipment among smart substations, and install parallel battery modules in a distributed way. This will help to eliminate conventional cable trough design and thus gradually cancel the control room design, making a fundamental change for substation design, and producing considerate social and economic benefit.

Comparison of Parallel Battery Pack and Traditional Serial Battery Pack

Type	Content	Traditional Serial Battery Pack	Parallel Battery Pack
Advantages	Busbar voltage	Voltage overlap after serial connection	DC/DC voltage boosting
	Battery connection	Serial connection	Indirect parallel connection via DC/DC
	Loading	All loads are centralized on the same DC busbar	Loads are segmented by loading type
	Redundancy configuration	All batteries in a pack must be configured redundancy	Battery modules are paralleled redundancy
	Configuration of DC system	Charger model, battery pack battery inspection device, insulation inspection device, DC monitor, and feeder	Parallel battery module, insulation inspection device, and feeder
	Configuration of DC system		Investment ≤ conventional investment in design
	Battery maintenance	In non-energized state	In energized state
	Battery maintenance	Manually operate the battery to quit operation, and test full battery capacity. At least two persons are needed to maintain for one day. Expense: 1000 RMB	Maintenance is in energized state, saving money on full battery capacity test.
	Repair and replacement	When power is outage, and carry out repair	Repair and replace the batteries in energized state
	Repair and replacement	200 RMB per time for operation expense	No expense
	Discharge	Battery voltage decreases with the discharging busbar	Battery voltage is stabilization via DC/DC
	Smart monitor degree	Moderate intelligent degree, but dead zone exists	High intelligent degree
	Installation	Centralized	Distributed or centralized
	Application scope	Substation	Any scenario where DC power and back- up batteries power is needed
	Anti-explosion and fire prevention	A battery room is set	These features have been taken into consideration during design
	Anti-explosion and fire prevention	Suppose that the battery room is 10m2, and construction fee is 5000 RMB per square meter; 5000 RMB expense on air condition. Total cost: 55,000 RMB	No expense
	Environmental protection	For DC 220V/200AH, 104 ( or 108) 2V lead- acid batteries are needed	For DC 220V/200AH, five 12V lead-acid batteries are needed. Lithium iron phosphate batteries are more environmental friendly.
Disadvantages	Impact resistance	A battery is equivalent to large capacity	Parts are redundancy design, and short- time excessive output and electrolytic capacitance output handle.
Disadvantages	Feeder short-circuit isolation	Short-circuit current is supplied by the battery	Short-circuit current is supplied by outputting electrolytic capacitance and by- pass rectifier circuit of the isolation transformer.

The parallel battery module is a typical technology and practice that complies with the policies of "resource saving, environmental protection and safety" and the management systems of OHSA and ISO40001.

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