Power Control System for Grid-Forming Energy Storage (GF-PCS)-Rolink Digital Energy（Xi'an）Limited

Four risks of new energy high penetration grids

Missing system inertia and frequency resonance destabilization

After new energy (photovoltaic, wind power) replaces the synchronous unit, the system rotational inertia plummeted. A small power perturbation can be triggered by frequency collapse with ± 0.5Hz fluctuations far beyond the ± 0.2Hz safety threshold.

Low short-circuit capacity and voltage dips collapse

New energy high-penetration areas have reduced short-circuit capacity (SCR<1.5) with weak voltage immunity to disturbances, which is prone to chained voltage instability.

Insufficient reactive power support and chained off-grid risk

Traditional grid-following equipment passively goes off-grid during grid failures, exacerbating system collapse. Xinjiang wind power bases have experienced large-scale disconnections triggered by voltage dips.

Unable to self-boot and dependent on main electricity recovery

New energy sources lack self-boot capabilities and rely on external power sources to restore them after a major power outage, which can take hours.

GF-PCS solution

The solution provides inertial damping It simulates the rotational inertia of a synchronous machine, responds to the rate of change of frequency (RoCoF) in the hundred milliseconds, releases/absorbs active power, and suppresses fluctuations within a ±0.2 Hz safety threshold. Frequency fluctuation<±0.2Hz< /span>

Active voltage construction As a voltage source, its output stabilizes the internal potential, maintains amplitude/phase angle under weak grid (SCR<1.5), provides 300% overcurrent support, and enhances short-circuit capacity. SCR<1.5 grid support and 300% short-circuit capacity

Ultra traversing support It withstands 20%-130% voltage dips, injects dynamic reactive power (±100% of Q capacity) during faults, forces equipment to be grid-connected without disconnecting, and blocks the collapse chain. ±100% reactive power injection and 20%-130% voltage change

Black start power engine Constructing grid voltage from zero, awakening self-booting capability, and realizing minute-by-minute reconstruction of purely new energy systems (22-hour region-wide resumption of power in Ejinjina). Black start to rebuild regional power grids in minutes

Ratings & Specifications Operating Environment External Dimensions

DC side rating
Direct current voltage (VDC)	1050 ~ 1500 V	DC side maximum current	1833 A
DC voltage ripple coefficient	<1%	DC current ripple coefficient	<3%
AC side rating
Rated power	1750 kW	Maximum output power	1900 kW
Rated grid voltage	690 V	Allowable grid voltage	630 ~ 760 V
Maximum AC output current	158 A	Rated grid frequency	50/60 Hz
Allowable grid frequency	45 ~ 55 Hz / 55 ~ 65 Hz	Total harmonic distortion (THD)	<3%
Power factor	>0.99	Power factor range	1.0(In advance) ~ 1.0(Backward)
AC access method	Three-phase three-wiring system

Item Parameter

Quality1600 kg

Dimension (Width×Height×Depth)1200 mm * 2400 mm * 1400 mm

Cooling methodForced air cooling

Allowable highest altitude5000 m（>3000 m de-rating needed）

Insulation methodTransformerless

Working temperature range-35 ℃ ~ 60 ℃（>45 ℃ de-rating ）

Allowable relative humidity0 ~ 95%，No condensation

Protection degreeIP65

Communication interfaceSupport CAN/RS485/RJ45/Optical fiber

Communication protocolCAN/Modbus/IEC60870-103/IEC61850 and so on

Power Control System for Grid-Forming Energy Storage (GF-PCS) shall comply with EN61000-6-2，EN61000-6-4，IEC62477，GB/T 34120-2017，GB/T 34133-2017，GB/T 36547-2018，GB/T 36548-2018，SAGC：BESF/RPPS、UL1741 and other standards.

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Application Scenarios

High percentage of new energy base Simulating synchronous generator characteristics, providing inertia support and damping control,suppressing broadband oscillations, and enhancing new energy grid-connected stability.

Weak grid and end grid It provides dynamic reactive power support and enhances voltage regulation.

Microgrids and off-grid system It provides voltage/frequency reference as mains power supply to support islanded operation, optimizes energy scheduling and improves renewable energy utilization.

Black start and grid restoration It gradually establishes a grid reference from a zero-voltage state and supports multi-machine co-starting.

Integrated energy system and shared energy storage It optimizes energy storage charging and discharging strategies to reduce system operating costs. Combined with virtual synchronous machine (VSG) technology, it enhances the dynamic response capability of the integrated energy system.

Grid foundation models and voltage regulation Standardized all-round monitoring of electrical fires through fault arc, leakage current and fire temperature monitoring equipment.

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臧文明刘福财 James Zhu 闫涛谈宏波陈跃欣张正辰王晓杰雒园汤晔彬王博博

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