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Robust control method for reactive power and voltage in distribution network considering photovoltaic and load uncertainties

A voltage controller and distribution network technology, applied in photovoltaic power generation, AC network voltage adjustment, electrical components, etc., can solve problems such as system voltage unsafe, photovoltaic node overvoltage, etc., to improve safety, facilitate effective response, Guaranteed effect of stability

Active Publication Date: 2021-08-10
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fluctuation and uncertainty of photovoltaic output and load, if the actual active output of photovoltaics running in the maximum power point tracking (MPPT) mode is large, while the actual power of the load is small, the system voltage may be unsafe, especially is the local overvoltage at the PV node

Method used

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  • Robust control method for reactive power and voltage in distribution network considering photovoltaic and load uncertainties
  • Robust control method for reactive power and voltage in distribution network considering photovoltaic and load uncertainties
  • Robust control method for reactive power and voltage in distribution network considering photovoltaic and load uncertainties

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Embodiment 1

[0054] A reactive power and voltage robust control method of distribution network considering photovoltaic and load uncertainties, including:

[0055] S1, convert the uncertain time delay caused by communication delay into a definite time delay, and establish a discrete control system model of the controlled node of the distribution network;

[0056] S2, based on the discrete control system model established by S1, the loads and photovoltaics connected to the nodes are regarded as uncertain quantities, and a multi-cell model describing the dynamic characteristics of the distribution network voltage control system is established, so that various values ​​of the uncertain quantities are constrained In the polytope model, and corresponding to each vertex of the polytope;

[0057] S3, using H ∞ The robust control principle converts the node voltage disturbance to the output gain into H ∞ For the problem of norm bound, use the linear matrix inequality optimization method to solve...

Embodiment 2

[0088] This embodiment specifically describes the reactive power voltage robust control method of the distribution network considering the photovoltaic and load uncertainties. The method includes the following contents:

[0089] (1) Reference figure 1 and figure 2 , the control system collects the voltage data of each photovoltaic grid-connected point from the sensor to obtain the voltage vector V of multiple photovoltaics, and the voltage reference vector V ref Comparing the input value ΔV of the voltage robust controller, that is, the voltage deviation vector of each photovoltaic grid-connected point, since it takes a period of time from the collection of voltage data to the completion of the tracking of each photovoltaic control command to complete the voltage control, it will bring control lag For this reason, the present invention needs to convert such uncertain time lag into deterministic time lag for simplifying control model and controller design;

[0090] (2) Consi...

Embodiment 3

[0122] A reactive power and voltage robust control system of distribution network considering photovoltaic and load uncertainties, including:

[0123] The discrete control system model building block converts the uncertain time delay caused by communication delay into a definite time delay, and establishes the discrete control system model of the controlled node of the distribution network;

[0124] The multicellular model building block, based on the discrete control system model established by S1, takes the load and photovoltaics connected to the nodes as uncertain quantities, and establishes a multicellular model that describes the dynamic characteristics of the voltage control system of the distribution network, making various uncertain quantities The value is constrained within the polytope model and corresponds to each vertex of the polytope;

[0125] h ∞ The control parameter solving module of the robust voltage controller, using H ∞ The robust control principle conve...

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Abstract

The invention discloses a reactive power voltage robust control method of a distribution network considering photovoltaic and load uncertainties, belonging to the field of distribution network operation control, and the method can be applied to a high-proportion distributed power source connected to a distribution network Operation control ensures the safe and stable operation of the distribution network voltage when the load and distributed power output are uncertain, and improves the reliability of the distribution network operation. The invention converts the uncertain time lag into the deterministic time lag by considering the possible communication delay in the hierarchical control process of the distribution network, and simplifies the design of the control model and the controller. The uncertainty of distributed photovoltaic and load output is considered in the system model by using the multi-cell model, and it is convenient to use the optimization method of LMI to solve the control parameters. The robust control principle is used to design the voltage control parameters to achieve the power control of multiple distributed power sources in the distribution network and solve the voltage limit problem.

Description

technical field [0001] The invention relates to the technical field of distribution network operation control, in particular to a distribution network reactive voltage Lubang control method considering photovoltaic and load uncertainties. Background technique [0002] For the distribution network with a high proportion of photovoltaic access, the reactive power adjustment capability brought by the high proportion of photovoltaic access can provide voltage support for the grid and improve the voltage limit problem of the distribution network. However, due to the fluctuation and uncertainty of photovoltaic output and load, if the actual active output of photovoltaics running in the maximum power point tracking (MPPT) mode is large, while the actual power of the load is small, the system voltage may be unsafe, especially is the local overvoltage at the PV node. Contents of the invention [0003] The purpose of the present invention is to provide a robust control method for r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/50H02J3/12
CPCH02J3/383H02J3/12H02J3/50H02J2203/20Y02E10/56
Inventor 袁晓冬柳丹葛浦东窦晓波顾伟
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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