Guide for Electric Load Analysis and Power Source Capacity Planning in High Voltage Electric Power Systems
This SAE Aerospace Recommended Practice (ARP) covers definitions, functions and broad application guidelines of electric load analysis and power source capacity planning and utilization in airborne platforms operated at high voltage DC (HVDC) and high voltage AC (HVAC) systems. These guidelines shall be applicable for both hybrid electric and all-electric propulsion schemes and dedicated ground support equipment. This document also defines the related distribution, integration, protection, and operational considerations, some of which may be outside of conventional power distribution and operations. Both propulsive and non-propulsive sources, systems, and loads and associated control systems comprise the new high voltage electric powerplant with individual load and source logic controls, protection, and power sources and load management that can report and receive commands from an autonomous vehicle management system or from an operator.
Rationale: This recommended practice describes planning and operations of electric power sources and loads in high voltage DC (HVDC) and high voltage AC (HVAC) Electrical power systems (EPS). This practice deliberates design considerations and operations of elements of EPS in all- or hybrid-electric airborne vehicles to support development of new architectures of EPS operated at greater than standardized 270 V DC or 235V AC systems. Analysis of several proposed power quality (PQ) requirements and architectures in the WIP SAE AS7499 and AIR8678 shows the necessity for additional requirements, deviations from the conventional schemes of load connections and management and sources' capacity planning, and a new hierarchy of control systems, which will provide guidelines for designing these newly EPS schemes and their operations.