The 33rd China International Exhibition on Electric Power Equipment and Technology
Shanghai International Energy Storage Technology Application Expo / Hydrogen Energy Expo
Microgrid equipment encompasses all the hardware and software components required to build and operate a microgrid — a localised group of electricity sources, loads, and storage that can operate either connected to the main grid (grid-tied mode) or independently (island mode). Core equipment categories include: distributed generation assets (solar PV inverters, wind turbines, diesel or gas generators, fuel cells); energy storage systems (battery systems with bidirectional inverters); microgrid controllers (the central intelligence that manages power flows, state of charge, and grid connection); protection and switching equipment (static transfer switches, circuit breakers, and fault current limiters); power quality equipment (active filters, voltage regulators); and communication and monitoring systems. Microgrid equipment must be designed for seamless transition between grid-connected and islanded operation, with protection systems capable of detecting and responding to both utility faults and internal faults.
5 Key Questions About Microgrid Equipment
Microgrids are classified by ownership (utility, commercial, community, military, campus) and by primary energy source (solar-diesel hybrid, all-renewable, combined heat and power). Key applications include: remote area power supply for communities and industrial sites without grid access; campus and industrial park energy management for cost reduction and resilience; military and critical infrastructure for energy security; island communities transitioning from diesel to renewable energy; and urban community microgrids providing local resilience and renewable integration.
A microgrid controller (MGC) continuously monitors generation, load, and storage state of charge, and dispatches resources to maintain voltage and frequency stability while optimising for cost, emissions, or resilience objectives. In grid-connected mode, the MGC may participate in demand response or export surplus generation. During islanded operation, the MGC must provide grid-forming functions — establishing voltage and frequency references — typically using battery inverters or synchronous generators. Advanced MGCs use predictive algorithms incorporating weather forecasts and load profiles to optimise dispatch decisions.
Microgrids present unique protection challenges because fault current levels change significantly between grid-connected and islanded modes — in island mode, fault current from inverter-based sources is typically limited to 1.2–2 times rated current, far below the levels that conventional overcurrent relays are designed to detect. This requires adaptive protection schemes that automatically adjust relay settings based on operating mode, or the use of differential protection that does not depend on fault current magnitude. Seamless transition between modes without causing power quality disturbances to sensitive loads is another key protection challenge.
Energy storage — typically lithium-ion battery systems — is the enabling technology for reliable microgrid operation. Storage provides the inertia and frequency regulation needed for stable islanded operation, buffers the intermittency of solar and wind generation, enables peak shaving to reduce demand charges, and provides backup power during grid outages. The sizing of storage capacity relative to generation and load is a critical design decision that determines the microgrid's ability to sustain islanded operation during extended periods of low renewable generation.
China has deployed microgrids in several contexts: remote island and rural electrification projects using solar-storage-diesel hybrid systems; industrial park and economic zone energy management systems combining solar, storage, and gas generation; zero-carbon demonstration projects at universities and government campuses; and military base energy security projects. The National Energy Administration has issued microgrid development guidelines and pilot project programmes that have stimulated investment in microgrid equipment and integration services. Chinese manufacturers have developed competitive microgrid controller and battery inverter products that are now being exported globally.
Key Takeaways
Microgrid equipment enables localised energy networks to deliver resilience, renewable integration, and energy independence at the community, campus, or industrial scale. China's active microgrid deployment programme and the global transition to distributed energy are driving strong growth in microgrid equipment demand. EP Shanghai showcases the full spectrum of microgrid components from inverters and controllers to protection systems and energy management software.
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