| The biomass-solar-wind multi-energy complementary system is composed of photovoltaic cells,wind turbines,storage batteries and distributed gas generators,which can realize multi-dimensional energy utilization with multiple energy inputs and multiple complementary energy sources and has received widespread attention.Since the system contains a variety of different energy sources and the operation conditions are complex,it is necessary to design a reasonable control strategy to ensure the safety of the system and the stability of power scheduling.Therefore,this article takes the distributed renewable energy system as the research object to carry out the research on power scheduling of the biomass-solar-wind multi-energy complementary system.The main contents are as follows:Firstly,the structure and principle of photovoltaic power generation unit,wind power generation unit,gas power generation unit and battery energy storage unit are analyzed.Based on energy supply unit and energy storage unit,combined with heat storage unit and gas production and gas supply unit,the system structure is designed.The system working condition is divided according to the power fluctuation,the basic output model of each energy supply unit is established and the system fluctuation value is defined.The system operation mode is formulated by combining the system fluctuation value,the state of battery charge,the temperature of heat storage device and the temperature of reaction device.Secondly,research on unit-level power control strategy is carried out.The maximum power point tracking control based on disturbance observation method is adopted for photovoltaic and wind power generation units to improve their power generation efficiency.An adaptive adjustment factor based on state of charge is proposed to solve the problem of overcharge and overdischarge of the battery which ensuring the autonomous power distribution of each battery unit in the battery bank.In order to solve the control problem of distributed gas power generation unit,it is simplified to distributed generation(DG).A finite time distributed secondary control method based on consistency algorithm is proposed to address the frequency and voltage deviation issues and active power allocation issues caused by droop control.Its stability is demonstrated through Lyapunov method.Based on MATLAB/Simulink,the simulation model is established to verify that the proposed method can restore the frequency to 50 Hz and the voltage to 380 V within a limited time of millisecond level,and ensure that the active power is distributed according to the droop coefficient.Moreover,the secondary control method is robust to the uncertainty of system parameters by setting random disturbance to the system parameters.Finally,the system-level power control strategy is carried out.A multi-agent-based centralized-coordination and distributed hierarchical control framework is proposed.The operation control of a single static system is introduced and analyzed,and then a dynamic operation control strategy combining various control modes is proposed.In order to meet the energy supply requirements of the system,the control strategy research was carried out for the operation modes under different working conditions.V/f control with battery as the main control unit is adopted under low power deficit and power interference conditions,and the system model was built using MATLAB/Simulink platform.The simulation results show that the reliability of power supply under low power deficit condition reaches 99.63%,the reliability of power supply under power interference condition reaches 99.62%.Under high power deficit conditions,distributed generation unit as the main control unit combined with DC bus voltage control is adopted.The simulation experiment shows that the reliability of power supply under high power deficit condition reaches 98%,the DC bus voltage is maintained at 750 V,the output frequency and voltage of DG unit are maintained at the nominal value,and the active power is effectively distributed according to the droop coefficient.Based on the organic integration of the control strategy under each working condition,the dynamic operation control strategy of multi-working condition switching is designed and its operating principle is elaborated... |
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