A distributed overvoltage protection system for a mobile photovoltaic power plant low voltage ride through test device

A low-voltage ride-through and photovoltaic power plant technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problems of grid voltage and frequency fluctuations, power outage accidents, power grid Fault deterioration and other problems to achieve the effect of eliminating overvoltage and preventing overvoltage damage

Active Publication Date: 2018-07-20
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

If this capability is not available, when a disturbance or fault occurs in the power grid, a large number of photovoltaic power plants will be disconnected in a short period of time, resulting in a large change in the power flow of the system, resulting in aggravated fluctuations in the voltage and frequency of the power grid, worsening the failure of the power grid, and may even cause large-scale power outage

Method used

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  • A distributed overvoltage protection system for a mobile photovoltaic power plant low voltage ride through test device
  • A distributed overvoltage protection system for a mobile photovoltaic power plant low voltage ride through test device
  • A distributed overvoltage protection system for a mobile photovoltaic power plant low voltage ride through test device

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Embodiment Construction

[0025] Embodiment The design of the overvoltage protection system is carried out for the low voltage ride through test device of the 35kV-1.5MW photovoltaic power station, and the configuration electrical positions of all arrester protection systems are as follows Figure 4 shown. The specific design and configuration are as follows:

[0026] 1. Lightning protection system for incoming and outgoing lines of the system

[0027] The whole low-voltage ride-through test device is mainly composed of a current-limiting reactor, a short-circuit reactor and a switch cabinet. The single-line diagram of the primary electrical system is shown in figure 1 shown. The lightning protection system for incoming and outgoing lines of the system mainly includes two parts: the system incoming lightning arrester group F1 and the system outgoing lightning arrester group F2. figure 2 shown. The two sets of arrester groups are assembled and combined with multiple single arresters to realize the ...

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Abstract

The invention relates to the technical field of access and control of power grid new energy, and designs an overvoltage protection system with high reliability and compact structure directing at the structure of a movable type photovoltaic power station low voltage ride-through testing apparatus and the operating characteristics of each main parts of the movable type photovoltaic power station low voltage ride-through testing apparatus so as to guarantee the operating safety of the power grid and the testing apparatus. The distributed overvoltage protection system includes a system inlet / outlet lightning protection system, an apparatus operation overvoltage protection system and a reactor overvoltage protection system, wherein the system inlet / outlet lightning protection system includes a system inlet lightning arrester set F1 and a system outlet lightning arrester set F2; the apparatus operation overvoltage protection system includes a current limiting reactance lightning arrester set F3 and a short circuit reactance lightning arrester set F4; and the reactor overvoltage protection system includes sectional type parallel lightning arrester sets F5-F6 which are arranged on each reactor in parallel connection in the movable type photovoltaic power station low voltage ride-through testing apparatus.

Description

technical field [0001] The invention relates to the technical field of grid new energy access and control, in particular to a distributed overvoltage protection system for a low-voltage ride-through test device of a mobile photovoltaic power station. Background technique [0002] In recent years, with the rapid development of photovoltaic power generation, its proportion in grid power supply has been increasing year by year. Large-scale centralized photovoltaic power station grid-connected power generation has become the mainstream of development. The impact of large-scale centralized photovoltaic grid-connected power generation on grid access can no longer be ignored. This requires large-scale photovoltaic power generation connected to the grid to have good grid adaptability, especially low-voltage ride-through capability. If this capability is not available, when a disturbance or fault occurs in the power grid, a large number of photovoltaic power plants will be disconnect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H9/02
CPCH02H9/021H02H9/041H02H9/044
Inventor 胡文平王磊高骏周文
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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