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Method for detecting interaction degree of DFACTS devices in power distribution system based on singular value decomposition method
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A singular value decomposition and power distribution system technology, applied in the field of interaction influence detection between DFACTS devices
Inactive Publication Date: 2014-08-20
STATE GRID CORP OF CHINA +1
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[0004] In order to solve the problem that there is no real-time detection method for the interactive influence degree between multiple DFACTS devices in the power distribution system in the actual industria
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specific Embodiment approach 1
[0029] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 1. The method for detecting the degree of interaction between DFACTS devices in the power distribution system based on the singular value decomposition method described in this specific embodiment includes the following steps:
[0030] Step 1. Establishing differential algebraic equations for the controllers of each DFACTS device in the power distribution system;
[0031] Step 2. Obtain a state space model according to the differential algebraic equations in step 1, and convert the state space model into a transfer function form, thereby obtaining the transfer function matrix G(s) of the power distribution system;
[0032] Step 3, performing singular value decomposition on the transfer function matrix G(s) obtained in step 2, obtaining the singular value of the transfer function matrix G(s), the left singular matrix Z(s) and the right singular matrix V(s);
[0033] Step 4. According to the transfer function matrix G(s), t...
specific Embodiment approach 2
[0035] Embodiment 2. The difference between this embodiment and the method for detecting the degree of interaction between DFACTS devices in the power distribution system based on the singular value decomposition method described in Embodiment 1 is that the state obtained according to the differential algebraic equations in step 2 The space model is: Δ x . = AΔx + BΔu Δy = CΔv + DΔu , Among them, A, B, C, D are the coefficient matrix, Indicates the derivation of △x, △x is the state variable, △y is the output variable, and △u is the input variable.
specific Embodiment approach 3
[0036] Embodiment 3. The difference between this embodiment and the method for detecting the degree of interaction between DFACTS devices in the power distribution system based on the singular value decomposition method described in Embodiment 1 or 2 is that the power distribution system obtained in step 2 The transfer function matrix G(s) is: G(s)=C(sI-A) -1 B+D, where I is the identity matrix.
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Abstract
The invention provides a method for detecting the interaction degree of DFACTS devices in a power distribution system based on a singular value decomposition method, and relates to the field of detection of the interaction degree of the DFACTS devices in the power distribution system. The method solves the problem that in actual industrial production application, a method for detecting the interaction degree of the DFACTS devices in the power distribution system in real time does not exist. The method for detecting the interaction degree of the DFACTS devices in the power distribution system based on the singular value decomposition method includes the steps that according to a transfer function of a researched system, singular value decomposition is conducted on a system transfer function matrix, singular values, a left singular matrix and a right singular matrix of the system transfer function matrix are respectively acquired, and on the basis, parameters and the condition number of the interaction degree are calculated, so that the interaction degree of the DFACTS devices is acquired according to the parameters and the condition number of the interaction degree. The method is suitable for detecting the interaction degree of the DFACTS devices in the power distribution system.
Description
technical field [0001] The invention relates to the field of detection of interaction influence degree between DFACTS devices in a power distribution system. Background technique [0002] With a large number of sensitive loads in the power distribution system being put into use, users have put forward higher and stricter requirements for high-quality power quality, especially voltage quality. DFACTS technology, also known as Custom Power technology, is the application of power electronics technology and modern control technology in power distribution systems, and has become a powerful tool to improve the power quality of power distribution systems. As one of the core devices of DFACTS technology, the distribution network static var compensator (DSVC) can comprehensively control power quality problems such as voltage fluctuations and flicker, voltage dips, and three-phase imbalances, and is most widely used in power distribution systems. With the increasing number of DSVC de...
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