Automatic switching control method for charge-discharge mode of energy storage converter

Abstract

The invention relates to an automatic switching control method for a charge-discharge mode of an energy storage converter. The automatic switching control method comprises the steps of sampling a current and a voltage of a DC-side bus, a converter output current, a network-side output current and a network-side voltage, and calculating a network-side power in real time; performing PI adjustment control according to difference between a given network-side power and an instantaneous output power of a converter, and determining a value of a Id component of a network-side current to change an output power of the converter; and simultaneously monitoring a voltage and current value of an energy storage battery, limiting a DC-side voltage and current according to a mode needed to be switched so as to conform to the demand of safety running of the energy storage battery. According to the charge-discharge switching control method of the energy storage converter, provided by the invention, charging and discharging are achieved according to three modes of constant-direct current, a constant-direct voltage and a constant-alternating current power; undisturbed switching of the three modes is achieved according to mutual assignments of an integrator and an output register of each PI controller, a battery-side power and the network-side power are not abruptly changed, only one controller runsduring actual running, and parameter setting of the controller is facilitated.

Description

technical field [0001] The invention belongs to the technical field of automatic control of power electronics, and in particular relates to an automatic switching control method for charging and discharging modes of an energy storage converter. Background technique [0002] With the continuous development of power electronics and power transmission, more and more electrochemical energy storage systems are applied to power systems, and various field adaptability problems emerge, which put forward more requirements on the performance of energy storage converters and batteries. high demands. [0003] The uncertainty of new energy power generation and power load fluctuations on the distribution side will cause grid load fluctuations. In order to smooth load fluctuations, electrochemical energy storage systems need frequent charging and discharging, etc. Due to battery characteristics, it is necessary to limit its charging and discharging voltage and current , The traditional en...

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Problems solved by technology

[0003] The uncertainty of new energy power generation and power load fluctuations on the distribution side will cause grid load fluctuations. In order to smooth load fluctuations, electrochemical energy storage systems need frequent charging and discharging, etc. Due to battery characteristics, it is necessary to limit its charging and discharging voltage and current , the traditional energy storage converter adopts constant power control, and realizes passive protection of the battery through the alarm and fault functions of the battery's own BMS, which will cause adverse effects on the battery

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