Capacitor split type static compensator circuit with zero-sequence voltage-sharing bridge arm and method
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A static compensator and zero-sequence technology, applied in reactive power compensation, circuit devices, AC network circuits, etc., can solve problems such as voltage imbalance and fluctuations, achieve small deviations and fluctuations, good system stability, and robustness Good results
Pending Publication Date: 2020-07-03
QINZHOU POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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[0006] The main purpose of the present invention is to provide a capacitor-split static compensator circuit and method with zero-sequence voltage equalizing bridge arms, which can solve the problem of unbalance and fluctuation of voltage on two split capacitors caused by zero-sequence current
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Embodiment 1
[0034] refer to figure 1 ,Such as figure 1 As shown, a capacitor-split static compensator circuit with zero-sequence voltage equalizing bridge arm, including low-voltage distribution network, capacitor split static compensator, zero-sequence voltage equalizing inductor L 0 , Zero-sequence equalizing bridge arm;
[0035] The zero-sequence equalizing bridge arm is connected between the positive busbar p and the negative busbar n of the static compensator;
[0036] Zero-sequence equalizing inductance L 0 Across the split capacitor C 1 and split capacitance C 2 midpoint of o 1 and zero-sequence equalizing bridge arm midpoint o 2 between;
[0037] Two split capacitors C 1 and C 2 midpoint of o 1 Connected to the neutral point of the low-voltage distribution network.
[0038] The capacitor-split static compensator circuit with zero-sequence voltage equalizing bridge arm of the present invention includes a low-voltage distribution network, a capacitor split static compensa...
Embodiment 2
[0044] refer to figure 2 ,Such as figure 2 As shown, a method of static compensator with split capacitor voltage equalizing bridge arm, that is, split capacitor voltage equalization control method, by controlling the zero sequence voltage equalizing bridge arm, the zero sequence current of the compensator is completely controlled by the zero sequence The voltage equalizing inductance branch is provided regardless of the split capacitor current, so that the zero-sequence current no longer affects the voltage of the two split capacitors; specifically, the following steps are included:
[0045] Step 1: Obtain the neutral wire current of the three-phase four-wire static compensator by summing the three-phase compensation current command values of the static compensator i n expected value of:
[0046]
[0047] in, i a.ref , i b.ref and i c.ref are the command values of compensator A phase, B phase and C phase compensation current respectively, i n.exp is the exp...
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Abstract
The invention discloses a capacitor split type static compensator circuit with a zero-sequence voltage-sharing bridge arm and a method, belonging to the field of compensation technology of a three-phase low-voltage power distribution system. The capacitor split type static compensator circuit with the zero-sequence voltage-sharing bridge arm comprises a low-voltage power distribution network, a capacitor split type static compensator, a zero-sequence voltage-sharing inductor L<0> and the zero-sequence voltage-sharing bridge arm, wherein the zero-sequence voltage-sharing bridge arm is arrangedbetween and connected with a positive bus p and a negative bus n of the static compensator; the zero-sequence voltage-sharing inductor L<0> is bridged between the midpoint o1 of a split capacitor C<1>and a split capacitor C<2> and the midpoint o<2> of the zero-sequence voltage-sharing bridge arm; and the midpoint o<1> of the two split capacitors C<1> and C<2> is connected to the neutral point ofthe low-voltage power distribution network. According to the capacitor split static compensator circuit with the zero-sequence voltage-sharing bridge arm and the voltage-sharing method thereof, the problems of imbalance and fluctuation of voltage of the two split capacitors caused by zero-sequence compensation current are solved.
Description
technical field [0001] The invention relates to the compensation technology of a three-phase low-voltage power distribution system, in particular to a capacitor-split static compensator circuit with a zero-sequence voltage equalizing bridge arm for a three-phase four-wire low-voltage power distribution system and a voltage equalizing method thereof. Background technique [0002] At present, in the three-phase AC power distribution system, most electrical equipment not only takes active power from the grid to do work, but also absorbs a large amount of reactive power from the grid to maintain the normal operation of inductive equipment. These reactive powers do not do work, but are exchanged back and forth between the power source and the electrical equipment through the grid, which increases the load current flowing through the grid, and thus produces significant power loss in the grid, reducing the transmission and distribution of the grid. electrical efficiency. For this ...
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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/26
CPCH02J3/18H02J3/1842H02J3/26Y02E40/30Y02E40/50
Inventor 邹宇奉斌同向前邱龙富苏一峰黄镜先曾祥海蒋再新
Owner QINZHOU POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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