Adaptive droop control method for MMC-MTDC system
A control method and self-adaptive technology, applied in wind power generation, AC network circuits, electrical components, etc., can solve the problems of low voltage quality and non-independent power distribution, and achieve the effect of low line loss and small DC voltage deviation
Active Publication Date: 2018-06-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0005] In order to solve the deficiencies of the prior art, the object of the present invention is to provide an MMC-MTDC system adaptive droop control method to solve the problems of low quality of traditional droop control voltage and independent power distribution
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Embodiment 1
[0094] Embodiment 1: Based on the electromagnetic transient simulation software PSCAD / EMTDC, build as Image 6 The four-terminal MMC-MTDC simulation model shown. WFC 1 and WFC 2 Represents the wind farm side converter station, which belongs to the input node and adopts power control; GSC 3 and GSC 4 Represents the grid-side converter station, which belongs to the output node, and adopts the adaptive droop control strategy in this paper. l 1 = 30km, l 2 = 20km, l 3 = 40km, l 4 = 20km, l 0 =80km, cable unit distance impedance value is 0.01Ω / km. The simulation verifies the control effect of the control method proposed by the present invention on the system during steady-state operation, power fluctuation, and N-1 operation.
[0095] Table 1 The main parameters of the simulation system.
[0096]
[0097]
[0098] According to the parameter setting principle of the present invention, the parameter setting is completed. k droop3 =20,k droop4 =20. ε 3 = 1.88, ε ...
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The invention discloses an adaptive droop control method for an MMC-MTDC system. The adaptive droop control method is characterized in that a power influence factor and a line impedance influence factor are introduced, the active power input by an AC side PPC point of a converter station is taken as an input quantity, the droop coefficient is taken as an output quantity, and the droop coefficientis adjusted in real time under the action of the influence factor, so that a P-V characteristic curve approaches to the optimal power distribution direction on the premise of not relying on high-speedcommunication. The adaptive droop control method provided by the invention has the beneficial effects that the main application occasion of the adaptive droop control method is an MMC-MTDC system forconnecting large-scale offshore wind wind power plants to the grid. A power influence factor and a line impedance influence factor are introduced, and the droop coefficient is adjusted in real time under the influence of the influence factor, so that the P-V characteristic curve approaches to the optimal power distribution direction. The adaptive droop control method provided by the invention hasthe advantages of not relying on high-speed communication, and being small in DC voltage deviation and low in line loss.
Description
technical field [0001] The invention relates to an adaptive droop control method of an MMC-MTDC system, which belongs to the technical field of electrical engineering. Background technique [0002] In recent years, due to the needs of large-scale renewable energy grid integration, asynchronous grid interconnection, and large-capacity long-distance power transmission, multi-terminal flexible DC transmission based on voltage source converters has attracted more and more attention. Compared with the traditional two-terminal DC transmission, the multi-terminal flexible DC transmission has better flexibility, economy and stability, and is the solution to the three major problems of clean energy "not available", "not delivered" and "difficult to absorb". one of the effective means. Modular multilevel converter is a new type of voltage source converter, which has the advantages of high voltage level, low harmonic content, and constant DC voltage polarity when the power flow is rev...
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IPC IPC(8): H02J3/38H02J3/48
CPCH02J3/386H02J3/48Y02E10/76
Inventor 王颖杰杨波焦岚轶王敏马标白飞莹张栋时阳李亚宇左慧芳闫浩浩
Owner CHINA UNIV OF MINING & TECH