The mainstream expansion mode of power frequency online UPS is self-adaptive parallel connection (up to 8 sets) and online thermal expansion. Its core advantages are high reliability, flexible expansion, online non-stop, cost optimization, excellent electrical performance and simple operation and maintenance.
First, high reliability: redundant architecture, eliminating single point of failure
Non-owner-slave peer-to-peer parallel connection: each UPS operates independently, with equal load sharing (uneven mobility ≤3%) and no centralized control bottleneck; Any single machine fault is automatically taken offline, the rest are seamlessly taken over, and the switching time is zero.
N+1/N+X redundancy: It can be configured as required (such as 2+1 and 3+1), giving consideration to expansion and redundancy, and avoiding the waste of "one-time investment of full capacity".
Shared battery pack: multiple machines can share batteries in parallel, reducing equipment redundancy and reducing fault points and maintenance costs.
Second, the expansion is flexible and smooth: expand as needed to protect investment.
On-line thermal expansion: the load does not need power failure, and the new UPS is connected to the parallel bus, synchronized with the phase, and the load is evenly distributed, with zero business interruption.
Step-by-step increase in capacity: 10–600 kVA for a single machine, with up to 8 parallel machines, which can be gradually expanded from small capacity to 4.8MVA to adapt to the gradual growth of business.
Heterogeneous parallel connection (some models): different power/same series models can be connected in parallel, automatically distribute load according to power, utilize old machines and reduce upgrade cost.
Third, excellent electrical performance: power frequency isolation, pure and stable output.
Built-in output isolation transformer: standard for power frequency machine, zero DC component, suppression of third harmonic, suitable for unbalanced/nonlinear loads (such as industrial motors and precision instruments).
Dual-conversion pure online: full-range voltage stabilization, harmonic/surge/frequency fluctuation filtering, pure sine wave output, and sensitive load protection.
Minimum circulating current: DSP fully digital control, phase difference < 0.5, circulating current < 2%, stable parallel operation without loss.
Fourth, cost and operation optimization: low TCO and simple management.
Invest in stages to reduce the initial cost: there is no need to purchase large capacity at one time, "invest while growing", and the capital occupation is small.
Simple maintenance and universal spare parts: the parallel system architecture is unified and spare parts are interchangeable; Support online maintenance, single machine maintenance does not affect the system operation.
High efficiency, low energy consumption: IGBT rectifier+DSP control, input power factor ≈1, harmonic < 3%, complete machine efficiency ≥92%, ECO mode up to 98%, reducing operating costs.
V. Adapting to industrial-grade scenarios: harsh power grid and heavy-load environment
Wide input voltage/frequency range: suitable for severe working conditions such as large fluctuation of distribution network and power supply by generator.
Strong overload and short-circuit ability: the power frequency transformer is shock-resistant and can withstand 125%-150% overload, which is suitable for industrial heavy load and motor load.
