Energy router operation control method and system

Abstract

The invention discloses an energy router operation control method and system. An energy router is divided into two working modes, namely a normal operation mode and a low-voltage ride-through mode. In a normal operation mode, system coordination and stability are realized through staged scheduling of output of a diesel generator, power balance between a source and a load is maintained, SOC regulation and control of an energy storage unit are realized, and efficient operation of an energy router is ensured; in the low-voltage ride-through mode, the diesel generator and the photovoltaic power generation unit output power according to the maximum output power, and the energy storage unit adopts constant-voltage control and system-level coordination control so as to inhibit the continuous drop of the bus voltage, support the rapid recovery of the bus voltage and ensure the effective ride-through of the low-voltage fault of the energy router. Meanwhile, low-voltage drop detection is carried out by adopting a zero-phase-shift low-pass filtering and hysteresis comparison method, so that the real-time performance and anti-interference performance of detection are ensured, and frequent switching between modes is avoided.

Description

Technical field [0001] The present invention relates to the field of micro-source interconnection and control technology, particularly an energy router operating control method and system. Background technique [0002] The energy router refers to a fusion information stream and an energy stream to realize a multi-source interconnection. Energy router topology interface figure 1 As shown, including two DC bus: the diesel generator is connected to the direct bollar line by one-way AC / DC converter, the photovoltaic array is connected to the direct DC / DC converter 1, and the energy storage unit is connected to the two-way DC / DC converter. The DC bus, the DC bus is supplied with a high pressure, a low-voltage DC interface, and a DC bus interconnection interface is left, which is convenient for external systems. The diesel generator is connected by bypass switch. The busbar, the DC bus is connected by the PWM inverter to the AC bus, and three phases are respectively introduced, a...

AI Technical Summary

Problems solved by technology

On the one hand, such scenarios lack the support of large power grids, and the energy router system does not have sufficient inertia and damping, and various power quality and stability problems emerge; at the same time, various forms of micro-sources have a wide range of output voltages, The large difference in output characteristics leads to the need for the energy router system to have a wide voltage range access capability and complicate the control method; in addition, various sensitive loads in this type of scenario have extremely high requirements for power supply reliability and anti-interference ability, which requires The dynamic and steady-state performance of the system coordinated control method poses high challenges

On the other hand, the environment in such scenarios is harsh, and the energy router system works in extreme conditions for a long time, which increases the probability of overcurrent, short circuit and other faults in the modules in the system. Such safety problems seriously threaten the stability and reliability of the entire system. Reliability, in order to ensure the rapid recovery and stable operation of the system after a fault occurs, the low-voltage ride-through capability of the energy router is facing more severe challenges

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