High voltage power grid harmonic wave absorption and grid voltage oscillation suppression device
A harmonic absorption and high-voltage power technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, reduce/prevent power oscillations, etc., can solve problems such as grid voltage oscillations, narrow frequency bands, and complex prices. Achieve the effects of no harmonic amplification, wide filtering frequency, and small fundamental wave loss
Active Publication Date: 2019-05-17
上海羲源电气科技有限公司
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Problems solved by technology
At the same time, multiple harmonic sources in the same power grid will be coupled and modulated, causing grid voltage oscillation, flicker, resonance, etc., which seriously affect the safe and stable operation of the grid
For this kind of problem in the high-voltage power grid, the existing high-voltage passive filter, a device can only target one or two harmonic frequencies, and the frequency band is too narrow
However, active filtering is too complex and expensive for high-voltage power grids, and there are many faults
Method used
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[0018] Such as figure 1 The structure diagram of the three-phase power system shown, it consists of harmonic current absorbing transformer ( figure 1 Absorb harmonic transformer), rk module, lc module, current detection I, voltage detection U, control and communication modules.
[0019] The primary side of the harmonic current absorbing transformer is connected between the high-voltage power grid and N (zero line), and each phase of the secondary side is connected to n (center point) through the series-connected rk module and lc module. The current detection I and the voltage detection U collect the output current and voltage of the secondary side of the harmonic current absorption transformer through the current sensor and the voltage sensor, and test the current passing through the rk module and the lc module and the voltage applied at both ends. The control and communication module analyzes and calculates the test current and voltage values, determines the value of the dam...
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The present invention relates to a high voltage power grid harmonic wave absorption and grid voltage oscillation suppression device. The primary side of a harmonic wave current absorbing transformer is connected between a high voltage power grid and a zero line, and each phase of the secondary side is connected to a center point via a series-connected rk module and a series-connected lc module toform low impedance(s) to all harmonic waves, sub-harmonic waves and inter-harmonic waves and to form high impedance(s) to the power frequency. The device is very conducive to harmonic wave absorption,and the device hardly affects the power frequency parameters of the circuit. To avoid the problem of harmonic wave amplification of an ordinary passive filter, the device is series-connected with damping resistors controlled by bidirectional thyristors taken as electronic switches, when the system detects that voltage flicker, fluctuation and resonance oscillation are existed in the power grid, the control system calculates according to the actual situation and controls different damping resistors to be connected in, and thus the phenomena of power grid voltage oscillation, fluctuation and resonance oscillation are effectively suppressed. The device is of great significance to the assurance of stable and reliable operation of power electronic weak power grid and the protection of safety and power quality of power grid electrical equipment.
Description
technical field [0001] The invention relates to a power device, in particular to a high-voltage power network harmonic absorption and network voltage oscillation suppression device. Background technique [0002] Non-linear loads in modern high-voltage power grids are becoming more and more common. Non-linear loads such as electric arc furnaces, high-voltage frequency converters, and high-voltage rectifiers inject a large number of harmonics into the power grid. Especially when the AC-DC-AC high-voltage system changes in load, the high-frequency harmonics injected into the grid contain a large number of inter-harmonic components. Under the influence of the phase-locked loop PLL, the network voltage oscillation occurs frequently. At the same time, multiple harmonic sources in the same grid will be coupled and modulated, causing grid voltage oscillation, flicker, resonance and other phenomena, which seriously affect the safe and stable operation of the grid. For this kind of p...
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Login to View More IPC IPC(8): H02J3/01H02J3/24
CPCY02E40/40
Inventor 狄天锡
Owner 上海羲源电气科技有限公司