Control system and control method for reducing fluctuation in solar photovoltaic power generation

Abstract

The invention discloses a control system for reducing fluctuation in solar photovoltaic power generation. The system comprises a power sponge connected in series between a power grid and a resistive load, a direct voltage detection device, an alternating current detection device, an alternating voltage detection device, and a control unit. The control unit measures alternating voltage u(s) and alternating current i(s) output by the power grid to the power sponge through the detection devices, and the control unit acquires the solar photovoltaic power generation power P(PV0) from a solar photovoltaic power generation system, and calculates three-phase power sponge pulse width modulation signals u(a), u(b) and u(c). The signals control the output voltage U1 of the resistive load so as to control the power P1 of the resistive load, suppress the fluctuation in the solar photovoltaic power generation power P(PV0), enable the power injected by the solar photovoltaic power generation system into the power grid to be P(PVref) and make the power level off. Accordingly, the invention discloses a control method for reducing fluctuation in solar photovoltaic power generation.

Description

technical field [0001] The invention relates to a solar photovoltaic power generation control system and method, in particular to a control system and method for reducing solar photovoltaic power generation fluctuations. Background technique [0002] Energy is an important material basis for the survival and development of human beings, and it is also an important factor affecting national security. Traditional petrochemical energy belongs to non-renewable energy and is facing the danger of depletion. On the other hand, due to the burning of fossil fuels, the atmosphere is heavily polluted. [0003] In order to solve the major problem of energy supply, countries all over the world have accelerated the development of new energy sources. As a clean energy source, solar energy has the following characteristics: first, it is inexhaustible; second, it is easy to obtain and ubiquitous; third, it is clean and pollution-free. [0004] The development and utilization of solar ener...

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Problems solved by technology

[0006] However, solar photovoltaic power generation has the characteristics of randomness and volatility, which affects the stability of the power grid. The grid connection of large-scale solar photovoltaic power generation has brought great challenges to the power grid.

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