MIIF practical calculation method considering reactive compensation device access
A compensation device and practical calculation technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, circuit devices, etc., can solve the impact of unforeseen grid structure changes, the inability to explain the internal causes of interactions between DC subsystems, Problems such as lack of predictability of multi-feed interaction factors
Active Publication Date: 2019-07-19
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
This method is simple and intuitive, but the MIIF obtained by this method is an experimental index, which needs to be obtained through transient simulation method, the physical meaning is not clear, it cannot explain the internal reason of the interaction between the DC subsystems, and it is impossible to predict the change of the grid structure The effect on the value of the factor
This makes the multi-feed interaction factors lack predictability and cannot reflect the influence of system structure changes and related factors on the interaction between systems
[0004] Aiming at the problems in the MIIF calculation method of the voltage deviation ratio, electric power workers have proposed different MIIF calculation formulas, such as the analytical expression for calculating MIIF based on the system node impedance matrix and the power flow reduced Jacobian matrix, but it does not consider the commutation bus Influence of Nodal Parallel Reactive Power Compensation Device on MIIF
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Embodiment 1
[0052] like figure 1 As shown, this embodiment provides a practical MIIF calculation method that takes into account the access of reactive power compensation devices.
[0053] The multi-DC infeed AC-DC hybrid system involves two or even more point-to-point high-voltage DC lines. Through the multi-port Thevenin equivalent, the multi-DC infeed AC-DC hybrid system can be simplified as figure 2 The model shown. from figure 2 As can be seen in , every AC system is equivalent to a series combination of a constant AC voltage source and a constant impedance. The capacitors, AC filters and other devices of each DC system inverter station are regarded as constant capacitance, and are connected in parallel at the AC bus of the inverter station. The electrical connection between the AC busbars of each DC system inverter station is regarded as a constant impedance. The inverter stations of the DC system are connected to the adjacent same side, the commutation buses of the inverter st...
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The invention relates to the technical field of DC power transmission, in particular to an MIIF practical calculation method considering reactive compensation device access. The method comprises the following steps but is not limited to the following steps: S1, establishing a node impedance matrix Z of a receiving end AC power grid; S2, calculating a multi-infeed interaction factor at a converterbus of the DC power transmission system to be inspected; S3, calculating an impedance correction amount generated by the parallel reactive power compensation device access to a node to be inspected; S4, calculating a corrected multi-infeed interaction factor of the node to be investigated; S5 performing sample validation. In the invention, the effect of the parallel reactive power compensation device is converted into the correction amount of the multi-infeed interaction factor for correcting the multi-infeed interaction factor, which can serve as a quantitative index for measuring the voltageinteraction strength between the DC subsystem commutation buses containing the parallel reactive power compensation device in a multi-DC-infeed AC / DC system.
Description
technical field [0001] The present invention relates to the technical field of direct current transmission, and more specifically, to a practical MIIF calculation method that takes into account the access of reactive power compensation devices. Background technique [0002] With the implementation of my country's "West-to-East Power Transmission" strategy, a large number of high-voltage direct current transmission projects have been put into operation in my country, and a multi-DC feeding AC-DC grid structure has been formed in load centers such as East China Power Grid and Southern Power Grid. The interaction between them becomes more and more obvious. Studies have shown that the interaction between DC systems has a great influence on the steady-state and dynamic characteristics of power systems. [0003] The multi-infeed interaction factor (Multi-infeed interaction factor, MIIF) defined on the basis of voltage interaction can reflect the mutual influence relationship betwe...
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IPC IPC(8): H02J3/36H02J3/18H02J3/00
CPCH02J3/36H02J3/1821H02J3/00H02J2203/20Y02E40/30Y02E60/60
Inventor 廖卫平周锐谢锟余卓彬朱业华伍建炜黄练栋温健锋廖汉才刘海光
Owner GUANGDONG POWER GRID CO LTD