Alternating current (AC) hybrid active power filter system for high-voltage direct current (DC) transmission, and control method thereof
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A high-voltage direct current transmission, high-voltage direct current technology, applied in active power filtering, power transmission AC network, AC network to reduce harmonics/ripples, etc.
Inactive Publication Date: 2015-06-03
HUNAN UNIV
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[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, provide an AC hybrid active filter system and its control method for high-voltage direct current transmission, and fundamentally solve the problem that traditional active filter systems cannot be directly applied to high-voltage direct current transmission Technical problems of AC filtering; effectively reduce equipment investment and operation and maintenance costs, reduce power loss per unit capacity, and improve the economy of HVDC (High-Voltage Direct Current) AC filtering devices
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Embodiment 1
[0048] Please refer to Figure 1 to Figure 5 , figure 1 For the AC hybrid active filter system for high-voltage direct current transmission provided by the present invention, the hybrid active filter system 2 includes a passive filter 4 and an active filter 3 connected to each other; the output terminal of the passive filter 4 directly Mounted on the common AC busbars on both sides of the converter stations at both ends of the HVDC transmission system.
[0049] Specifically, in the prior art, the high-voltage direct current transmission system includes a converter transformer 62 , a double-bridge 12-pulse rectifier station 63 and a double-bridge 12-pulse inverter station 64 . The double-bridge 12-pulse rectifier station 63 and the double-bridge 12-pulse inverter station 64 are connected to each other; the double-bridge 12-pulse rectifier station 63 is connected with a converter transformer 62 to form a converter station; the double-bridge 12-pulse inverter station 64 is conne...
Embodiment 2
[0075] This embodiment provides a control method for the hybrid active filter system described in Embodiment 1. The control method is mainly implemented by the controller 6 to achieve good harmonic filtering and reactive power compensation, voltage stabilization, Pressure equalization and circulation suppression effect.
[0076] Such as Figure 6 Shown, described method it comprises the following steps:
[0077] S1, harmonic current detection;
[0078] S2, outer ring voltage control;
[0079] S3. Calculating the command signal of the output voltage of the active filter;
[0080] S4. Voltage equalization control: including interphase voltage equalization control and power sub-module voltage equalization control;
[0081] S5, circulation suppression;
[0082] S6. Carrier phase-shift modulation.
[0083] Specifically, in S1, the harmonic current detection method includes: a-phase voltage v on the AC side of the HVDC transmission system sa Through the voltage phase-locked l...
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Abstract
The invention provides an alternating current (AC) hybrid active power filter system for high-voltage direct current (DC) transmission, and a control method of the AC hybrid active power filter system. The AC hybrid active power filter system is applied to a high-voltage DC transmission system, and comprises a passive power filter and an active power filter which are connected with each other, wherein an output end of the passive power filter is directly connected with AC sides of convertor stations at two ends of a high-voltage DC output power system; the passive power filter comprises three groups of single-tuned passive filters, wherein each group of single-tuned passive filter is correspondingly connected with one phase of the AC sides of the convertor stations; the single-tuned passive filter groups have a series resonance characteristic; the active power filter comprises a modular multi-level converter and a controller connected with the modular multi-level converter; a DC end of the modular multi-level converter is connected with a capacitor in parallel. After the AC hybrid active power filter system and the control method of the system are adopted, the equipment investment and the operation and maintenance cost are effectively reduced, the electric energy loss generated by unit capacity can be reduced, and the economy of a high-voltage DC transmission AC filtering device can be improved.
Description
technical field [0001] The invention relates to harmonic control and reactive power compensation of high-voltage direct current transmission AC, and more specifically relates to an AC hybrid active filter system and a control method thereof for high-voltage direct current transmission. Background technique [0002] The distribution of power consumption load and power generation energy in my country is very uneven. The eastern region has more load but less energy, and the northwest and southwest regions have more energy but less load. Establishing thermal power and hydropower bases in the energy center, and large-capacity and long-distance transmission of electric energy to the load center is a better way to solve this contradiction. This requires the establishment of a national energy transmission channel and the deployment of "power transmission from west to east, mutual supply between north and south, and national networking". High-voltage direct current transmission can ...
Claims
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