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Overvoltage power control method, system, and medium for photovoltaic access to medium and low voltage distribution networks

A low-voltage distribution network and power control technology, which is applied in the field of low-voltage distribution network, can solve problems such as voltage dips that may occur, and achieve the effect of reducing active power loss and increasing penetration

Active Publication Date: 2021-12-07
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adding a reactive power compensation device is a relatively common method nowadays, but this method requires the installation of an additional reactive power compensation device, which will increase the maintenance frequency of the equipment, and the reactive power compensation device can only be used for both voltage rise and voltage drop One of the phenomena is arranged, but in the actual distribution network, due to the randomness and intermittent nature of the distributed power supply, the phenomenon of voltage rise and voltage drop may occur, so it has limitations

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  • Overvoltage power control method, system, and medium for photovoltaic access to medium and low voltage distribution networks
  • Overvoltage power control method, system, and medium for photovoltaic access to medium and low voltage distribution networks
  • Overvoltage power control method, system, and medium for photovoltaic access to medium and low voltage distribution networks

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Embodiment 1

[0061] Embodiment 1 of the present invention proposes a method for controlling overvoltage power of photovoltaics connected to medium and low voltage distribution networks, the flow chart of which is as follows figure 1 as shown, figure 2 For its schematic, see Figure 1-2 , the method described in Embodiment 1 includes the following steps S101-S104:

[0062] Step S101, setting initial control parameters: rated voltage V of medium and low voltage distribution network cri , The maximum output power P of the photovoltaic power supply under a certain solar irradiance (unit kW) MPPT , Droop control coefficient m T ;

[0063] Step S102, according to the rated voltage V of the medium and low voltage distribution network cri , the maximum output power P of the photovoltaic power supply MPPT , Droop control coefficient m T And the following formula (1) controls the active power output by the photovoltaic system locally, and obtains the active power P of the grid-connected poin...

Embodiment 2

[0081] Based on the first embodiment of the present invention, the second embodiment of the present invention proposes another overvoltage power control method for connecting photovoltaics to medium and low voltage distribution networks, the flow chart of which is as follows image 3 as shown, Figure 4 For its schematic, see Figure 3-4 , in addition to steps S101-S104 of the method described in Embodiment 1, the method described in Embodiment 2 includes the following steps S105-S106:

[0082] Step S105, execute the output m of the neuron network with the multi-layer ADP , voltage drop ΔV, and active power attenuation are input as input to a pre-trained multi-layer evaluation neuron network for processing and output J(t);

[0083] Step S106 , optimize the weights of the multi-layer execution neuron network according to the output J(t) of the multi-layer evaluation neuron network, and return to step S103 .

[0084] Wherein, the multi-layer evaluation neuron network includes a...

Embodiment 3

[0097] Embodiment 3 of the present invention proposes an overvoltage power control system for photovoltaic access to medium and low voltage distribution networks, which is used to implement the overvoltage power control method for photovoltaic access to medium and low voltage distribution networks described in Embodiment 1. Figure 5 For the framework diagram of the system described in Embodiment 3, refer to Figure 5 , the system includes:

[0098] Initialization unit 1, used to set the initial control parameters: rated voltage V of medium and low voltage distribution network cri , The maximum output power P of the photovoltaic power supply under a certain solar irradiance MPPT , Droop control coefficient m T ;

[0099] The active power control unit 2 is used for the rated voltage V of the medium and low voltage distribution network cri , the maximum output power P of the photovoltaic power supply MPPT , Droop control coefficient m T And the following formula (1) contro...

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Abstract

The invention relates to a method, system and medium for overvoltage power control of photovoltaics connected to medium and low voltage distribution networks. In the method, when the output voltage of the grid connection point is lower than the rated voltage, the active power output by the photovoltaic system will be fully output Medium and low voltage distribution network; when the output voltage of the grid-connected point is higher than the rated voltage, in order to adjust the voltage to make the system run stably, the output active power of the photovoltaic system is limited due to the droop control coefficient. The executive neuron network is established to dynamically modify the droop control coefficient, and the output of the evaluation neuron network is used to update the executive neuron network. The invention can not only ensure that the voltage of the system runs within the rated range, but also reduce the active power loss of the system and improve the overall penetration rate of the distributed power supply in the power grid.

Description

technical field [0001] The invention relates to the field of low-voltage distribution networks, in particular to a method, system and medium for controlling overvoltage power of photovoltaics connected to medium and low-voltage distribution networks. Background technique [0002] With the development of society and economy, energy and environmental issues have attracted the attention of the whole society, and the development and utilization of renewable energy has become more and more urgent. As a sustainable energy alternative, solar photovoltaic power generation has developed rapidly in recent years and has been widely used all over the world. Among them, distributed photovoltaic power generation is the most widely used. According to statistics, by the end of 2018, the installed photovoltaic system power generation network had reached 380PKW, an increase of about 30% over 2017, accounting for about 1.8% of the world's electricity supply, of which rooftop photovoltaic power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48
CPCH02J3/48
Inventor 王廷凰
Owner SHENZHEN POWER SUPPLY BUREAU
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