Station level virtual synchronous machine control system and method and application thereof

A virtual synchronous machine and control system technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve the collapse of the power system, reduce the real-time performance and reliability of the system, and increase the data processing work of the control chip of the energy storage converter etc. to achieve the effect of power smoothing, improving the characteristics of primary frequency modulation and voltage regulation, and improving the absorption capacity

Active Publication Date: 2017-08-18
BEIJING SOARING ELECTRIC TECH CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In this method, each converter only detects the voltage and frequency of its own grid-connected point, and controls according to the corresponding output according to the detection results. The power flow distribution and voltage conditions of other nodes have global control blind spots, which may lead to the risk of collapse of the entire power system; quickly detect the grid information of its own grid-connected points and formulate corresponding control algorithms, which increases the data processing of the energy storage converter control chip work, reducing the real-time performance and reliability of the system

Method used

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  • Station level virtual synchronous machine control system and method and application thereof
  • Station level virtual synchronous machine control system and method and application thereof
  • Station level virtual synchronous machine control system and method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0053] Such as figure 1 As shown, a station-level virtual synchronous machine control system is composed of a renewable energy power station (field) and a station-level energy management system with a power electronic converter as the interface; the power station (field) passes a unique The public coupling point PPC is connected to its superior power grid; the power station includes multiple power generation sources, which use power electronic converters to realize energy conversion, and connect to the local grid connection point Gi, where the power generation sources can be photovoltaic modules, wind turbines and energy storage Battery; the station-level energy management system detects the voltage and frequency signals of the PCC point and the grid-connected port of each power generation source, and realizes the power scheduling of each power generation unit according to the control strategy of the virtual synchronous machine.

[0054] The station-level virtual synchronous m...

Embodiment 2

[0056] Such as figure 1As shown, using a method for implementing a station-level virtual synchronous machine control system, the control method includes steps:

[0057] (1) First, the energy management system detects the voltage u and frequency f at the port side of the PCC point of the upper power grid

[0058] (2) According to the frequency change of the power grid, the active power output strategy of primary frequency modulation is formulated:

[0059]

[0060] in

[0061] P: Indicates the active output of the power station;

[0062] P 0 : Grid at rated frequency f N Power station output within the range;

[0063] T J : Characterizes the characteristic parameters of the virtual synchronous generator simulating the inertial time constant of the traditional synchronous generator, which can be calculated according to the moment of inertia of the virtual synchronous generator. According to the difference of the generator, generally within the range of 4s to 12s, the re...

Embodiment 3

[0083] Such as figure 2 As shown, a station-level virtual synchronous machine control application, on the basis of Embodiment 1 or 2, adopts the application form of photovoltaic or direct-drive wind turbine grid-connected power station. In this system, the power generation source passes through the power electronic converter Connected to the grid-connected point, the active energy can only flow in one direction, and the energy is affected by factors such as solar irradiance and wind speed. Therefore, when this type of grid-connected power generation system implements the virtual synchronous machine strategy, when given When the output is greater than the maximum output allowed by the source at this time, it will be limited to the maximum output, and the system will have no upward adjustment capability; otherwise, when the given output is less than the maximum output allowed by the source at this time, it can be achieved by not implementing the photovoltaic maximum power point ...

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Abstract

The invention discloses a station level virtual synchronous machine control system and method and an application thereof. The station level virtual synchronous machine control system comprises power generation sources with power electronic converters as interfaces and a station level energy management system. The power generation sources access to an upper level power grid through an only common coupling point PPC; the power generation sources use the power electronic converters to realize energy conversion and access to a local grid connected point; the station level energy management system realizes power scheduling of power generation units through detecting PCC points and voltage and frequency of grid-connected interfaces of the power generation source according to a control strategy of the virtual synchronous machine. The station level virtual synchronous machine control system and method and an application thereof overcome flaws in the power electronic converter and the virtual synchronous machine, improves characteristics of primary frequency modulation and voltage regulation of the system through an inertia link of the virtual synchronous motor and can greatly improve stability of the power grid, and is applicable to distribution of high permeation and multiple access points and a big scale concentrated renewable energy power generation system.

Description

technical field [0001] The invention relates to the field of virtual synchronous machine control systems, in particular to a station-level virtual synchronous machine control system, method and application thereof. Background technique [0002] With the large-scale utilization of power generation systems such as solar energy, photovoltaics, and energy storage, the power system is changing from the rotary interface of traditional synchronous generators to digitally controlled power electronic interfaces. From the source point of view, renewable energy such as solar energy and wind energy has the characteristics of randomness and volatility; from the point of view of the grid-connected interface, the energy conversion unit adopts digital control, has no inertia, and has poor overload resistance. The stability of the system brings new challenges. The scale of the traditional power system continues to expand, mainly due to the synchronization mechanism of the natural inertia li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/42
CPCH02J3/42Y02E10/56
Inventor 王仕城伍春生龙欢
Owner BEIJING SOARING ELECTRIC TECH CO LTD
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