An internal mode decoupling control method for a multi-terminal flexible DC transmission system
A technology of DC transmission system and internal mode decoupling, applied in AC network circuits, electrical components, circuit devices, etc., can solve problems such as DC voltage and AC network fluctuations, DC output voltage fluctuations of converter stations, etc., to increase stability , the effect of enhancing the ability to operate independently of each other
Active Publication Date: 2021-07-13
西安能拓软件科技有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide an internal model decoupling control method of a multi-terminal flexible direct current transmission system to solve the problem that the fluctuation of the direct current output voltage of the converter station leads to the fluctuation of the output direct current voltage of the interconnected converter station and the alternating current network
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[0085] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0086] Such as Figure 1-6 As shown, an internal model decoupling control method for a multi-terminal flexible direct current transmission system, the method has the following steps:
[0087] Step 1: Establish a VSC small-signal model
[0088] Mathematical model of VSC converter such as figure 1 as shown,
[0089] in is the dq axis component of the PWM modulation signal,
[0090] u cdi , U cqi It is the dq axis component of the fundamental frequency phase voltage measured by AC,
[0091] K is the gain of the converter station, T σ is the switching period.
[0092]
[0093] The VSC small-signal model is shown in the above formula,
[0094] In the formula, U di0 , are the steady-state values corresponding to their state variables.
[0095] Step 2: Establish a small-signal model of the AC network connected to the VSC:...
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The invention discloses an internal model decoupling control method of a multi-terminal flexible direct current transmission system, which belongs to the technical field of electric power transmission, and is used to solve the problem that the fluctuation of the direct current output voltage of the converter station leads to the fluctuation of the output direct current voltage of the interconnected converter station and the alternating current network question. The method includes establishing a VSC small-signal model, establishing a small-signal model of an AC network connected to a VSC, establishing a small-signal model of a DC network connected to a VSC, establishing a small-signal model of a three-terminal flexible direct current transmission system, establishing a state-space model of a three-terminal flexible direct current transmission system, Design a decoupling compensator to make the generalized controlled object form a diagonal advantage, and design an internal model decoupling control strategy for a multi-terminal flexible DC transmission system. The invention adopts an internal model decoupling control strategy to weaken the coupling between converter stations in the multi-terminal flexible direct current transmission system, enhance the independent operation capability of each converter station, and increase the stability of the whole system.
Description
technical field [0001] The invention belongs to the technical field of electric power transmission, and in particular relates to an internal model decoupling control method of a multi-terminal flexible direct current transmission system. Background technique [0002] In recent years, the construction of new energy in my country has been rapid, and the grid-connected capacity of wind power and photovoltaics has been increasing year by year. The proportion of new energy power generation in my country's energy structure is getting higher and higher. Large-scale new energy power generation bases are far away from the load center, and new energy resources and load centers are reversed. Distribution, large output fluctuations, limited capacity of transmission channels, frequent abandonment of wind and light, and improving the capacity of new energy consumption has become an urgent problem to be solved in the new energy industry. Multi-terminal flexible DC transmission technology has...
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IPC IPC(8): H02J3/00H02J3/36H02J3/38
CPCH02J3/00H02J3/36Y02E60/60
Inventor 董海鹰邹玮玮苏苗红刘开启陈晓婧
Owner 西安能拓软件科技有限公司