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Ultrahigh-order harmonic stable mode acquisition method of VSC interface-containing distributed power supply

A technology of distributed power supply and stable mode, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., and can solve problems such as harmonic instability and power grid pollution

Active Publication Date: 2019-05-21
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

The harmonic instability caused by the connection of PWM-VSC to the power grid is increasing, mainly manifested in: PWM (pulse width modulation technology) will bring high-order harmonics near the switching frequency, which will bring pollution to the power grid; power distribution The extensive use of filters in the grid, especially the LCL filter at the outlet of the VSC, interacts with the grid to make high-frequency resonance problems more and more common

Method used

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  • Ultrahigh-order harmonic stable mode acquisition method of VSC interface-containing distributed power supply
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  • Ultrahigh-order harmonic stable mode acquisition method of VSC interface-containing distributed power supply

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Embodiment

[0030] The invention provides a super-high-order harmonic stability calculation method of a distributed power supply with a VSC interface for a new ultra-high-order harmonic phenomenon—super-harmonic.

[0031] Such as figure 1 As shown, the present invention provides a method for calculating the ultra-high harmonic stability of a distributed power supply containing a VSC interface, which is characterized in that the following steps:

[0032] Step 1: Divide the grid into three main subsystems: inverter, network and load. When establishing the small signal model of the entire network, it is necessary to select the frequency of one of the DGs (distribute) as the D-Q reference coordinate system, and uniformly convert other DGs to this reference coordinate system;

[0033] Step 2: For each grid-connected DG unit, its control module includes power control, voltage outer loop control and current inner loop control. In addition, it also includes the output LC / LCL filter, etc., write...

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Abstract

The invention relates to an ultrahigh-order harmonic stable mode acquisition method of a VSC interface-containing distributed power supply. The ultrahigh-order harmonic stable mode acquisition methodcomprises the following steps of 1) building a signal state space model of a power grid system comprising an inverter, a network and a load, and acquiring a system state space matrix Asys; 2) acquiring a characteristic value of the system state space matrix Asys by a mode state analysis method; and 3) acquiring an ultrahigh-order harmonic stable mode of the power grid system of the VSC interface-containing distributed power supply by a root-locus method and by combining the characteristic value, a characteristic vector and a reference factor of the system state space matrix Asys. Compared withthe prior art, the ultrahigh-order harmonic stable mode acquisition method has the advantages of detail, intuition, comprehensive consideration and the like.

Description

technical field [0001] The invention relates to the field of operation, analysis and dispatching of electric power systems, in particular to a method for acquiring ultra-high-order harmonic stable mode of a distributed power supply with a VSC interface. Background technique [0002] With the development of my country's power grid, large-scale access to new energy power generation and the expansion of electrified railways have increased the harmonic and negative sequence current content of the power grid. As new energy and electrified railways are the harmonic source and negative sequence source of the power system, the magnitude of the harmonic current and negative sequence current injected into the power grid is variable at any time. If the deterministic analysis method is used to consider the harmonic The magnitude of the wave current and negative-sequence current is used to obtain the value of the harmonic current and negative-sequence current of a certain power in the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 潘爱强潘玲张鹏余光正
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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