High-voltage DC power transmission system equivalent current-and-voltage source modeling method and high-voltage DC power transmission system equivalent current-and-voltage source model
A power transmission system, high-voltage direct current technology, applied in the direction of AC network circuit, circuit device, power transmission AC network, etc., can solve the problem of inapplicability of large power grid simulation, to ensure availability and applicability, simplify the DC control part, reduce the Effects of Complexity and Difficulty
Active Publication Date: 2017-07-18
STATE GRID HENAN ELECTRIC POWER +2
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[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a high-voltage direct current transmission system equivalent current and voltage source modeling method and model, and solve the technical problem that the current direct current model is not applicable to large power grid simulation
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[0057] Taking short-term fault removal of AC system as an example, a modeling method of equivalent current and voltage source of HVDC transmission system suitable for electromechanical process simulation of large power grid includes the following steps:
[0058] Step 1. Analyze the dynamic characteristics of DC voltage and DC current during the period from AC fault occurrence to fault removal; determine that the DC voltage goes through the stages of falling, maintaining and rising, and the DC current goes through the stages of rising, falling, maintaining and rising;
[0059] According to a large number of measured data and combined with the mechanism for characteristic analysis, take short-term fault removal of AC system as an example. When the AC system fault is removed for a short time, the commutation failure of the DC system occurs first, and it returns to normal after the fault is removed. The dynamic response curve of the DC system is as follows image 3 shown.
[006...
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The invention discloses a high-voltage DC power transmission system equivalent current-and-voltage source modeling method which is suitable for large power-grid electromechanical process simulation. The method comprises the following steps of analyzing a dynamic characteristic of DC voltage and DC current under the same disturbance type, and determining different periods of fluctuation and the characteristic of each period; performing fitting on the current and voltage characteristic of each period by means of a corresponding function, and obtaining a respective segmented function model; performing equivalence on each function section of the current and the voltage by means of a corresponding current source and a voltage source, and switching each segmented function by the current source and the voltage source according to a time sequence. According to different controlled states of a DC system in a fault process, a rectifier station can be simplified to an equivalent current source; an inverter station can be simplified to a voltage source; and an operation characteristic and output power of the whole DC system can be determined by the states of the corresponding current source and the voltage source. The high-voltage DC power transmission system equivalent current-and-voltage source modeling method has advantages of ensuring a main dynamic characteristic of power of the DC system, reducing modeling complexity and difficulty, and reducing calculation amount in simulation.
Description
technical field [0001] The invention relates to the technical field of power system modeling, in particular to a modeling method for an equivalent current and voltage source of a high-voltage direct current transmission system. The model is suitable for simulation calculation of electromechanical processes in a large power grid. Background technique [0002] DC transmission has a large power capacity, and at the same time takes into account the advantages of low transmission loss, flexible transmission power adjustment, and high transmission reliability. Therefore, it is widely used in long-distance and large-area grid interconnection and large-capacity power transmission. While high voltage direct current (HVDC) transmission system brings huge benefits, it also brings operational complexity and a series of new problems. The commutation failure and blockage of the DC system will have a large system impact on the AC system, affecting the safe and stable operation of the power...
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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 代飞鞠平张毅明赵健陈军陈谦熊浩清姜梦吴峰金宇清秦川
Owner STATE GRID HENAN ELECTRIC POWER