Energy router operation control method and system

Abstract

The invention discloses an energy router operation control method and system, which divides the energy router into two working modes: a normal operation mode and a low-voltage ride-through mode. In the normal operation mode, the coordination and stability of the system is achieved by scheduling the output of the diesel generator in stages, maintaining the power balance between the source and the load, and at the same time realizing the SOC regulation of the energy storage unit to ensure the efficient operation of the energy router; The generator and photovoltaic power generation unit output according to the maximum output power, the energy storage unit adopts constant voltage control, and the system-level coordinated control is used to suppress the continuous drop of the bus voltage, support the rapid recovery of the bus voltage, and ensure the effective ride-through of low-voltage faults of the energy router. At the same time, the zero-phase-shift low-pass filter and hysteresis comparison method are used for low-voltage drop detection to ensure real-time detection and anti-interference performance, and to avoid frequent switching between modes.

Description

technical field [0001] The invention relates to the technical field of micro-source interconnection power supply and control, in particular to an energy router operation control method and system. Background technique [0002] Energy router refers to a power electronic device that integrates information flow and energy flow to realize multi-source interconnection. Energy router topology interfaces such as figure 1 As shown, it includes two DC busbars: the diesel generator is connected to the DC busbar via a one-way AC / DC converter, the photovoltaic array is connected to the DC busbar via a one-way DC / DC converter 1, and the energy storage unit is connected via a two-way DC / DC converter. DC bus, DC bus through one-way DC / DC converters 2 and 3 respectively form high-voltage and low-voltage DC interfaces to supply power. At the same time, the DC bus has a DC bus interconnection interface to facilitate the interconnection of external systems; the diesel generator is connected t...

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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