Research On Power Control Strategy And Control Characteristics For Testing Load Characteristics Of Electrolytic Hydrogen Production

In order to build a clean,low-carbon and efficient energy system,there is a growing demand for hydrogen energy utilization.As a hydrogen production method which is highly relevant to the current power grid with a high proportion of new energy access,the working characteristics of the hydrogen production electrolytic reactor load of its key equipment are particularly important under the condition of fluctuating power supply.Therefore,it is of great significance to study the test power supply fluctuation for load characteristics test of hydrogen production electrolytic reactor.It not only needs to satisfy the DC current for electrolytic supply,but also needs to provide frequency controllable ripple current,so as to simulate the supply fluctuation and test the working characteristics of hydrogen production load.At first,this paper analyzes the functional requirements of the test power supply and designs the overall topology of the test power supply according to the requirements.The DC output of the test power supply is provided by diode-controlled rectifier,triple interleaved Boost converter,and ripple current output is provided by single-phase inverter circuit.Then,this paper analyzes the working principle and mathematical model of each converter of the test power supply and sets the corresponding control strategy,and establishes the load equivalent circuit of hydrogen production electrolyzer applicable to this paper according to the research of existing literature.Finally,the test power supply topology is built on the PSIM simulation platform,and its functional realization is verified..Then,the non-isolated test power supply of inverter is studied in this paper.In this paper,according to the principle of reducing system volume and cost as much as possible,reducing loss and improving efficiency in actual production,the topology of non-isolated test power supply of inverter is established.Then,the causes of internal circulation are analyzed through equivalent circuit,and the series resistance suppression circulation and the circulation suppression method based on improved topology are proposed.According to the principle of reducing the loss,the semi-bridge inverter non-isolated test power supply topology is finally adopted for the subsequent research,and the simulation verifies the correctness of the analysis of the causes of circulation and the flow path.Finally,this paper studies the control characteristics of the test power supply.Firstly,this paper starts from testing the stability of the power supply,and analyzes and tests the DC output characteristics of the power supply by establishing a model and designing the voltage and current double loop control strategy.Then,according to the high precision requirements,this paper proposes the inverter control strategy based on load ripple current,analyzes its ripple current output characteristics and verifies it on the PSIM simulation platform.Then,in order to suppress the output shunt of the inverter,this paper studies the influence of DC side series inductance on the output of the test power supply,and designs the inductance value in combination with the requirements of high precision and fast response.Finally,this paper verifies the correctness of the analysis through simulation.