A reactive power control method and system for a photovoltaic power generation system

A photovoltaic power generation system and power control technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems that affect the stable operation of inverters, power system hazards, and system crashes

Active Publication Date: 2019-01-04
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(5) Low-frequency oscillation suppression of the power grid. The low-frequency oscillation frequency of the power grid is low, the cycle is long, and it affects a wide range, which brings great harm to the power system. Oscillation can even lead to the collapse of the entire system. With the centralized grid-connected operation of large-scale photovoltaic power plants, t...

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  • A reactive power control method and system for a photovoltaic power generation system
  • A reactive power control method and system for a photovoltaic power generation system
  • A reactive power control method and system for a photovoltaic power generation system

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[0129] Two reactive power control flags Vflag and Qflag are set, and three different control modes including reactive power control, voltage control, and reactive voltage coordinated control can be realized through the combination of different setting values ​​of the flag bits. The values ​​of different flag bits correspond to The control modes are shown in the table below.

[0130] Table 1 Flag setting and reactive power control mode

[0131] control mode

Vflag

Qflag

reactive power control

0 or 1

0

voltage control

0

1

Coordinated control of reactive power and voltage

1

1

[0132] (1) Reactive power control mode: photovoltaic power generation system according to the received reactive power reference value Q ref Adjust the system reactive power output to the reference value.

[0133] (2) Voltage control mode: The photovoltaic power generation system adjusts the reactive power of the system according to the received...

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Abstract

The invention relates to a reactive power control method and system for a photovoltaic power generation system, comprising the steps of obtaining a reference value signal of the photovoltaic power generation system in the reactive power control mode based on a set reactive power control mode of a photovoltaic power generation system model; controlling the output of the converter according to a reference value signal; The reactive power control mode comprises a voltage control mode, a reactive power control mode and a reactive power-voltage coordination control mode. Through the scheme, the photovoltaic power generation system can adapt to different reactive power regulation requirements of the power grid.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a reactive power control method and system for a photovoltaic power generation system. Background technique [0002] With the emergence of problems such as environmental pollution, petrochemical energy depletion and energy supply security, the development and utilization of renewable energy has attracted more and more attention from the international community. Solar energy is a renewable and clean energy, and photovoltaic power generation is its main form of utilization. Compared with traditional power generation technologies, photovoltaic power generation has the advantages of sustainable energy, safety and environmental protection, and has developed rapidly in recent years. [0003] When the photovoltaic system is integrated into the grid, when its own capacity is relatively small relative to the grid, the impact of its power disturbance on the security an...

Claims

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Application Information

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IPC IPC(8): H02J3/50H02J3/38
CPCH02J3/383H02J3/50Y02E10/56
Inventor 钱敏慧赵大伟马进姜达军吴福保
Owner CHINA ELECTRIC POWER RES INST
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