Core technologies of the PCS6000 power supply system

Date: Feb 06, 2026 Views: 56906

　　The core technologies of the PCS6000 power system mainly include bidirectional energy conversion technology, four-quadrant operation technology, intelligent control strategy system, seamless grid-connected and off-grid switching technology, high-precision current detection technology, soft-switching technology, digital control and protection technology, and efficiency optimization technology. The following is a detailed introduction to these core technologies:

　　Bidirectional Energy Conversion Technology

　　Function: Enables efficient and controllable bidirectional energy conversion between DC batteries and the AC grid. During off-peak hours, it rectifies the AC power from the grid into DC power to charge the energy storage battery; during peak hours, it inverts the DC power stored in the battery into AC power and feeds it back to the grid.

　　Application Scenarios: Supports peak shaving and valley filling, improving grid stability and economy.

　　Four-Quadrant Operation Technology

　　Function: Achieves independent regulation of active and reactive power through high-frequency switching control of power devices such as IGBTs. It operates flexibly within four power quadrants, supporting reactive power compensation and voltage regulation of the grid.

　　Technical Advantages: The power factor can be continuously adjusted within the range of -1 to 1, improving the power quality of the grid.

　　Intelligent Control Strategy System

　　Hierarchical Control Architecture:

　　Bottom Layer Drive: Based on Space Vector Pulse Width Modulation (SVPWM) technology, it generates IGBT drive signals with a switching frequency of 10~20kHz.

　　Middle Layer Control: Utilizes a vector control algorithm (dq coordinate system decoupling) to achieve independent active/reactive power regulation, combined with a PID controller to optimize dynamic response.

　　Top Layer Strategy: Adaptive power allocation algorithm supports seamless switching between grid-connected and off-grid modes, with a switching time of <20ms. Built-in harmonic suppression module effectively filters out major harmonics such as the 5th/7th/11th orders, achieving a THD (Total Harmonic Distortion) of ≤5%.

　　Dynamic Reactive Power Compensation Function: Real-time adjustment of grid voltage fluctuations, supporting stable operation within ±10% of the rated voltage range.

　　Seamless Switching Technology Between Grid-Connected and Off-Grid Mode

　　Grid-Connected Mode: Employs a phase-locked loop (PLL) to track grid phase, frequency, and voltage in real time, with a grid connection error of <0.01Hz. Features soft grid connection capability, with an inrush current ≤1.2 times the rated current, protecting grid equipment safety.

　　Off-grid mode: Employs droop control strategy to maintain stable voltage amplitude (±5%) and frequency (±0.2Hz). Supports multi-unit parallel operation, achieving load sharing through active-frequency (P-f) and reactive-voltage (Q-V) droop curves, with current unevenness ≤5%.

　　Seamless switching technology: Configured with a dual detection mechanism (active frequency offset + passive voltage surge detection), islanding detection time <50ms. The switching process employs pre-synchronization technology, adjusting the output voltage phase/frequency to match the grid before grid connection, with switching inrush current <1.0 times the rated current.

　　High-precision current detection technology

　　Function: Real-time and accurate sensing of the current flowing in the system, providing crucial data support for closed-loop control, system protection, efficiency optimization, and battery management.

　　Technical advantages:

　　Basic of closed-loop control: Whether it's current source control during grid connection or voltage source control during off-grid operation, a current feedback signal is needed to form a closed loop, ensuring the output follows the given command.

　　System protection triggering basis: The determination of faults such as overcurrent and short circuits directly relies on real-time data provided by the current detection module. Once an abnormal current is detected, the protection circuit will immediately act to prevent equipment damage.

　　Efficiency optimization reference: By monitoring the current, the system can calculate real-time power and optimize the control strategy of the switching devices to pursue higher conversion efficiency.

　　Important input for battery management: Charge and discharge current are key parameters for assessing the state of health (SOH) and calculating the remaining capacity (SOC). Accurate current detection is a prerequisite for realizing intelligent battery management.

　　Soft switching technology

　　Function: Reduces losses and improves efficiency. Achieves "conduction when voltage is zero, deactivation when current is zero" through resonance or auxiliary circuits, fundamentally reducing switching losses.

　　Mainstream technologies:

　　Zero-voltage switching (ZVS): Suitable for DC-AC inverter mode. Through the resonance of the resonant inductor Lr and the junction capacitance of the switching transistor, the voltage before the switching transistor turns on is reduced to zero.

　　Zero-current switching (ZCS): Suitable for AC-DC rectification mode. Before the switching transistor turns off, the current is reduced to zero through resonance. Active Clamping Technology: Adding auxiliary switching transistors and clamping capacitors to the full-bridge topology absorbs leakage inductance energy and achieves zero-voltage switching (ZVS), improving efficiency by 2%~3%, suitable for industrial PCS above 10kW.

　　Digital Control and Protection Technology

　　Function: Improves reliability and intelligence. Achieves rapid detection and protection against common faults such as overvoltage, overcurrent, overheating, and short circuits through hardware circuits and software algorithms.

　　Technical Advantages: Various sensors in the hardware circuit monitor the PCS's operating parameters in real time, issuing alarms immediately upon detecting abnormalities; the software algorithm analyzes and judges the data from the sensors, determines the fault type, and quickly takes protective measures.

　　Efficiency Optimization Technology

　　Function: End-to-end optimization from "devices" to "algorithms" improves the conversion efficiency of the PCS.

　　Technical Means: Employs high-efficiency power devices, optimizes control algorithms, and reduces switching losses.

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