A distribution network voltage control method based on photovoltaic inverter regulation

A voltage control method and photovoltaic inverter technology, which is applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of inability to perform continuous regulation and decline in reactive power output, and achieve good control effects and economical and accurate control , The effect of strengthening the practical value of engineering

Active Publication Date: 2022-03-15
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Voltage control is an important daily task of the distribution network. At present, the voltage control of the access point of the photovoltaic power station in the literature is mostly realized through a parallel static var compensator (SVC), but the input SVC cannot be continuously adjusted and there are When the node voltage drops greatly, its reactive power output drops and other disadvantages

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  • A distribution network voltage control method based on photovoltaic inverter regulation
  • A distribution network voltage control method based on photovoltaic inverter regulation
  • A distribution network voltage control method based on photovoltaic inverter regulation

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Embodiment 1

[0061] Such as Figure 1 to 3 FIG An embodiment of the present invention to provide a voltage control method of adjusting the distribution network based photovoltaic inverter may include the steps of:

[0062] When the voltage out of the node and the inverter power factor angle has not reached the capacity limit angle, into the control strategy of the inverter voltage phase reactive power compensation;

[0063] The process proceeds to the maximum power of the inverter is adjusted in phase at the node where the threshold voltage, the maximum power is reached when the inverter but have not yet reached the maximum power factor angle;

[0064] In the case where the threshold voltage of the node, if the inverter has reached the maximum power factor angle, enters the inverter is maintained at the reduced power inverter stages in a state of maximum power factor angle.

[0065] Process In one possible implementation, the reactive power compensation into the phase voltage of the inverter co...

Embodiment 2

[0097] Such as Figure 1 to 3 FIG An embodiment of the present invention to provide a voltage control method of adjusting the distribution network based photovoltaic inverter may include the steps of:

[0098] PV power plant is provided access point and the target voltage value of the inverter capacity and the inverter power, power factor and node voltage monitoring angle;

[0099] When the voltage out of the node and the inverter power factor angle has not reached the capacity limit angle, into the control strategy of the inverter voltage phase reactive power compensation;

[0100] The process proceeds to the maximum power of the inverter is adjusted in phase at the node where the threshold voltage, the maximum power is reached when the inverter but have not yet reached the maximum power factor angle;

[0101] In the case where the threshold voltage of the node, if the inverter has reached the maximum power factor angle, enters the inverter is maintained at the reduced power inver...

Embodiment 3

[0109] Such as Figure 1 to 3 As shown, a power-based voltage control method according to an embodiment of the present invention may include the following steps:

[0110] When the node voltage is defined, the inverter power does not reach a capacity limit angle due to the angle of the inverter, and the reactive compensation phase of the inverter voltage control strategy is entered;

[0111] In the case where the node voltage isterfredent, the maximum power adjustment phase of the inverter is entered when the inverter reaches the maximum power but does not reach the maximum power factor angle;

[0112] In the case of the node voltage estimation, if the inverter has reached the maximum power factor angle, the power reduction phase of the inverter is entered in a state where the inverter remains at the maximum power factor angle;

[0113] After performing the inverter voltage adjustment strategy, the node voltage is continued to form a closed loop control.

[0114] In a possible imple...

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Abstract

In order to easily and effectively realize the voltage control of the access point of the photovoltaic power station, the present invention discloses a distribution network voltage control method based on photovoltaic inverter regulation, which includes the following steps: when the node voltage exceeds the limit and the inverter power The factor angle has not yet reached the capacity limit angle, and enters the reactive power compensation stage of the inverter voltage control strategy; when the node voltage exceeds the limit, when the inverter reaches the maximum power but has not yet reached the maximum power factor angle, it enters the inverse The maximum power adjustment stage of the inverter; in the case of node voltage exceeding the limit, if the inverter has reached the maximum power factor angle, then enter the power reduction stage of the inverter when the inverter remains at the maximum power factor angle . The invention does not need to communicate to obtain the load level and distribution of the feeder, and can make full use of the capacity of the inverter to adjust the voltage quickly, and has good control effect and economy.

Description

Technical field [0001] The present invention relates to the field of voltage control technology of the photovoltaic power station grid, and is specifically a distribution mesh voltage control method based on a photovoltaic inverter. Background technique [0002] The access of the photovoltaic power station has a great impact on the operation of the distribution network, especially the impact on the voltage loss of the distribution grid is not negligible, especially when the photovoltaic station has a high penetration, the access point voltage is too high. Thereby, the case where this point voltage is caused. At present, the 10kV and the following three-phase supply voltage allows the deviation of ± 7%, due to the decisiveness of the external environment and the variation characteristics of the full-day load demand, the power direction and the size of the distribution line output The node voltage of the network may have a high or high condition, and the supply voltage quality has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50
CPCH02J3/385H02J3/48H02J3/50Y02E10/56
Inventor 凌平王蕾谢伟赵艳雷柳劲松张勇方陈刘舒
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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