Unified power quality regulator for medium-voltage distribution networks
A technology of power quality and distribution network, applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve the problems of waste of management funds, lack of coordination, mutual influence, etc., to control voltage sags and improve voltage stability and reliability, to ensure the effect of stable operation
Active Publication Date: 2018-12-07
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
However, when multiple power quality problems coexist in a power supply area, multiple different target control devices need to be used together. At present, due to the lack of coordination between multiple devices, it may cause repeated compensation for some power quality problems. Or interact with each other, so that the governance of power quality cannot achieve the desired effect
In addition, there may be repeated installation of power quality control devices with similar functions, resulting in waste of control funds
Method used
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[0015] like figure 1 and figure 2 As shown, this embodiment provides a unified power quality conditioner for medium-voltage distribution networks, including three single-phase energy storage conversion units 1 corresponding to each of the three phases of ABC (see figure 1 , respectively 1#1~1#3), three single-phase multi-winding parallel transformers 2 and three single-phase series transformers 3, the single-phase energy storage conversion unit 1 includes 2n first units and nth Two units, the first unit includes a single-phase full-bridge AC-DC converter 11, the power supply side bidirectional DC-DC converter 12, the energy storage device 13 and the load side bidirectional DC-DC converter 14, the second unit includes a three-phase six In the bridge arm DC-AC converter 15, the AC ports of all 2n single-phase full-bridge AC-DC converters 11 of the first unit are respectively connected to the 2n low-voltage windings of the single-phase multi-winding parallel transformer 2 of th...
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The invention discloses a unified power quality regulator for medium-voltage distribution networks. The unified power quality regulator comprises three single-phase energy storage conversion units, three single-phase multi-winding parallel transformers and three single-phase series transformers which correspond to the A, B and C phases. Each single-phase energy storage conversion unit includes 2*nfirst units and n second units. Each first unit includes a single-phase full-bridge AC-DC converter, a power supply side bidirectional DC-DC converter, an energy storage device and a load side bidirectional DC-DC converter. Each second unit includes a three-phase six-arm DC-AC converter. The unified power quality regulator is mainly used in medium-voltage distribution networks at an intermediate(10kV or 35kV) voltage level, and can restrain the harmonic current on the load side, balance the currents of the three phases of a distribution transformer, improve the utilization ratio of transformers, dynamically compensate the reactive power of the load, improve the power factor of a distribution network, rapidly compensate the active power of the load, and improve the stability and reliability of the voltage of power supply to users.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a unified power quality regulator for medium-voltage distribution networks. Background technique [0002] As a secondary energy source that is economical, practical, clean, convenient, and easy to control and convert, electric energy has become an important basis for economic development and people's lives. With the wide application of power electronic equipment, various non-linear, impulsive, fluctuating and asymmetrical loads have increased substantially, resulting in problems such as unbalanced three-phase voltage, voltage sag, harmonics, low power factor, negative sequence Power quality problems such as high current content. At the same time, due to the large variation range of the distribution network load, it is difficult to adjust the distribution network voltage, and the power supply voltage is high or low, and even the voltage exceeds the limit. Therefore, how to...
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IPC IPC(8): H02J3/00H02J3/01H02J3/26H02J3/16H02J3/12
CPCH02J3/00H02J3/01H02J3/12H02J3/16H02J3/26Y02E40/30Y02E40/40Y02E40/50
Inventor 张坤蒋毅熊尚峰李理蔡昱华
Owner STATE GRID HUNAN ELECTRIC POWER
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