Hierarchical DLM Case Studies

This section provides detailed case studies for Hierarchical Dynamic Load Management (HDLM), with multiple configuration examples of increasing complexity.

1. Multi-Level Parking Garage

1.1. Scenario

A parking garage has three levels, each with its own set of EV chargers. The entire garage shares a 500A power supply, which needs to be distributed evenly.

1.2. How Hierarchical DLM Helps

• Balances power across all levels.
• Prevents overloads by capping each level's power usage.

1.3. Configuration Example

Location in Config UI	Parameter	Value	Set on	Info
Load Management > Hierarchical Dynamic Load Management	Hierarchical DLM Mode	Enabled (local MQTT broker)	Main Controller	Manages all levels.
Load Management > Hierarchical Dynamic Load Management	EVSE Sub-Distribution Limit (L1/L2/L3) [A]	200/200/200	Level 1 Sub-Master	Limits power per level.
Load Management > Hierarchical Dynamic Load Management	EVSE Sub-Distribution Limit (L1/L2/L3) [A]	150/150/150	Level 2 Sub-Master
Load Management > Hierarchical Dynamic Load Management	EVSE Sub-Distribution Limit (L1/L2/L3) [A]	150/150/150	Level 3 Sub-Master
Load Management > Dynamic Load Management	Dynamic Load Management Mode	DLM Slave	All Charging Stations	These chargers follow the level's allocation.

2. Corporate Campus with Mixed-Use Buildings

2.1. Scenario

A corporate campus has multiple buildings with different power requirements:

• Main office building with 30 employee chargers
• Visitor center with 10 fast chargers
• Fleet depot with 20 delivery van chargers The campus has a total power capacity of 800A, with building-specific sub-limits.

2.2. How Hierarchical DLM Helps

• Manages power distribution across all buildings while respecting their individual limits
• Prioritizes fast charging at the visitor center during business hours
• Ensures fleet vehicles are fully charged by morning
• Dynamically adjusts power allocation based on time of day and building usage patterns
• Prevents campus-wide power overload while maximizing charging efficiency

2.3. Configuration Example

Location in Config UI	Parameter	Value	Set on	Info
Load Management > Hierarchical Dynamic Load Management	Hierarchical DLM Mode	Enabled (local MQTT broker)	Campus Main Controller	Central coordinator for all buildings
Load Management > Hierarchical Dynamic Load Management	EVSE Sub-Distribution Limit (L1/L2/L3) [A]	300/300/300	Office Building Master	Highest allocation for employee charging
Load Management > Hierarchical Dynamic Load Management	EVSE Sub-Distribution Limit (L1/L2/L3) [A]	250/250/250	Visitor Center Master	Dedicated capacity for fast charging
Load Management > Hierarchical Dynamic Load Management	EVSE Sub-Distribution Limit (L1/L2/L3) [A]	250/250/250	Fleet Depot Master	Ensures overnight fleet charging
Load Management > Charging Priorities	Charging Priority Mode	Time-based priority	Visitor Center Master	Maximizes power during business hours
Load Management > Maximum Current Scheduler	Maximum Current Scheduler	On	Fleet Depot Master	Increases available current during overnight hours
Load Management > Dynamic Load Management	Dynamic Load Management Mode	DLM Slave	All Charging Stations	Stations follow their building master's allocation

3. Implementation Considerations

When implementing Hierarchical DLM solutions:

• Plan your hierarchy carefully, considering both current needs and future expansion
• Document the relationship between coordinators, masters, and slaves
• Test communication between all levels of the hierarchy before full deployment
• Consider network reliability and implement fallback mechanisms
• Monitor the system's performance to ensure proper power distribution across all levels

For specific implementation guidance, consult our DLM Configuration Guide and Hierarchical DLM Guide.