Photovoltaic power plant AVC control method

Abstract

The present invention discloses a photovoltaic power plant AVC control method, and the control errors of a calculation inverter and a reactive compensation device are calculated. The control error compensation and state estimation technology are introduced in a voltage reactive adjustment process, and the reactive control is carried out through the mode of gradually reducing the steady-state error between the outputs of photovoltaic power plant reactive power sources and a control target. After a reactive target is received, combined with a current reactive actual value, reactive power sources in a field are coordinated, and the reactive target issued by a main station is rapidly followed to carry out reactive control. According to the method, the reactive power balance of the inverter and the reactive compensation device can be reasonably allocated, under the premise of ensuring the safe and stable operation of photovoltaic power plant equipment, the dynamic continuous adjustment is realized to control grid-connected point voltage, and the requirement of the grid voltage is satisfied.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation of a photovoltaic power station, in particular to an AVC control method of a photovoltaic power station. Background technique [0002] In recent years, solar power generation has achieved great development with the strong support of the state. Due to the randomness and intermittent characteristics of solar power generation, it has caused difficulties and complications in the operation and scheduling of the power grid, which has had a great impact on the safe and stable operation of the power grid. Therefore, the grid dispatching organization urgently needs to realize real-time monitoring of the operation of photovoltaic power plants. As a new system of photovoltaic power plants, AVC (automatic voltage control) technology has a vital impact on the voltage of photovoltaic power plants. [0003] The rapid development of photovoltaic power generation has brought great challenges t...

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Problems solved by technology

[0006] However, there are the following problems in the actual application of this scheme at present: 1. According to the distribution strategy of power factor, within one command cycle (at present, all levels of scheduling that have been connected generally issue one command within 5 minutes, within one command cycle , the solar panel is affected by the light intensity, and the active power changes frequently. At this time, there will be frequent changes in the output command (usually 15-30s, according to the calculated reactive power increment, which is sent to the inverter once or gradually. ); Second, individual inverters have inaccurate reactive power output, or failure to output reactive power due to faults, resulting in adjustment errors this time

[0007] All in all, the voltage qualification rate of AVC regulation of photovoltaic power plants is generally low at present

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