CN109768553B - Harmonic wave absorption and network voltage oscillation suppression device for high-voltage power network - Google Patents
Harmonic wave absorption and network voltage oscillation suppression device for high-voltage power network Download PDFInfo
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- CN109768553B CN109768553B CN201910015795.6A CN201910015795A CN109768553B CN 109768553 B CN109768553 B CN 109768553B CN 201910015795 A CN201910015795 A CN 201910015795A CN 109768553 B CN109768553 B CN 109768553B
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Abstract
The invention relates to a harmonic wave absorption and network voltage oscillation suppression device for a high-voltage power network. The harmonic absorption is very facilitated, and the power frequency parameters of the circuit are hardly influenced. In order to avoid the harmonic amplification problem of a common passive filter, the bidirectional thyristor controlled damping resistor serving as an electronic switch is connected in series, when the system detects that voltage flicker, fluctuation and resonance phenomena occur in a power grid, the control system calculates and controls to access different damping resistors according to actual conditions, and the voltage grid voltage oscillation, fluctuation and resonance phenomena can be effectively inhibited. The method has very important significance for ensuring the stable and reliable operation of the power electronic weak power grid and protecting the safety and the power quality of the power grid electrical equipment.
Description
Technical Field
The invention relates to an electric power device, in particular to a harmonic wave absorption and network voltage oscillation suppression device for a high-voltage power network.
Background
Nonlinear loads in modern high-voltage power grids are increasingly common, and nonlinear loads such as electric arc furnaces, high-voltage frequency converters and high-voltage rectifiers inject a large amount of various harmonics into the power grids. Particularly, when the load of an AC-DC-AC high-voltage system changes, high-frequency harmonics injected into a power grid contain a large amount of inter-harmonic components, and under the influence of a phase-locked loop (PLL), grid voltage oscillation frequently occurs. Meanwhile, a plurality of harmonic sources in the same power grid can be subjected to coupling modulation, so that the phenomena of power grid voltage oscillation, flicker, resonance and the like are caused, and the safe and stable operation of the power grid is seriously influenced. For the problem of the high-voltage power grid, one device can only aim at one or two harmonic frequencies and the frequency band is too narrow in the existing high-voltage passive filter. Active filtering is too complex and expensive for a high-voltage power grid, and has more faults. Therefore, the present invention is very important for solving such problems.
Disclosure of Invention
The invention provides a harmonic wave absorption and network voltage oscillation suppression device for a high-voltage power network, aiming at the problems of subharmonic waves, harmonic waves and inter-harmonic waves of various nonlinear loads injected into the power network in a high-voltage single-phase and three-phase power system and network voltage oscillation, fluctuation and flicker caused by the subharmonic waves, the harmonic waves and the inter-harmonic waves. The harmonic absorption is very facilitated, and the power frequency parameters of the circuit are hardly influenced. In order to avoid the problems of harmonic amplification and system damping of a common passive filter, the bidirectional thyristor controlled damping resistor serving as an electronic switch is connected in series, when the system detects that voltage oscillation, fluctuation and resonance phenomena occur in a power grid, the control system is connected with the damping resistor according to the actual situation and a special algorithm, and the voltage oscillation, fluctuation and resonance phenomena can be effectively inhibited. The method has great significance for ensuring the stable and reliable operation of the power grid and protecting the safety and the power quality of the electrical equipment of the power grid.
The technical scheme of the invention is as follows: a harmonic absorption and network voltage oscillation suppression device for a high-voltage power network comprises a harmonic current absorption transformer, a rk module, an lc module, a current detection module, a voltage detection module and a control and communication module; the primary side of the harmonic current absorption transformer is connected between a high-voltage power grid and a zero line, and each secondary side of the harmonic current absorption transformer is connected with a central point through a rk module and an lc module which are connected in series; the current detection and voltage detection module samples the secondary side output current and voltage of the harmonic current absorption transformer through a current sensor and a voltage sensor; and the sampling value is sent to the control and communication module for calculation, the control and communication module outputs a control signal to the rk module, and the switching action in the rk module is controlled, so that the rk module is in different damping resistance states.
The multi-stage damping resistor structure is formed by connecting 3 branches in parallel, a first branch is a single switch, and a second branch and a third branch are respectively formed by connecting 2 resistors R1 and R2 with different resistance values in series with a switch.
The switch can be an electronic switch consisting of a pair of anti-parallel thyristor devices, or a mechanical switch,
the lc module is formed by connecting an inductor L and a capacitor C in parallel, the capacitor C forms a high-frequency path, the inductor L forms a low-frequency path, the inductor L and the capacitor C form a wide-band filter circuit after being connected in parallel, and a parallel resonance high-resistance circuit is formed by the power capacitor C and the power inductor L at a power frequency point.
The device is installed in a direct column-on mode, a harmonic current absorption transformer is installed on the upper layer, other parts are arranged in a damping cabinet, and the damping cabinet is installed on the lower layer and is arranged on an upper installation frame and a lower installation frame; the upper layer and the lower layer are communicated by a cable pipeline.
The invention has the beneficial effects that: compared with the traditional high-voltage passive filter, the harmonic wave absorption and network voltage oscillation suppression device for the high-voltage power network has the advantages of wide filtering frequency band, high fundamental wave impedance, low fundamental wave loss, no harmonic wave amplification, controllable damping and the like. The structure is simple compared with the high-voltage active compensation device, the operation is reliable, and the price is low.
Drawings
FIG. 1 is a structural diagram of a harmonic absorption and network voltage oscillation suppression device of a high-voltage power network according to the present invention;
FIG. 2 is a schematic diagram of the installation of the harmonic absorption and network voltage oscillation suppression device on the column of the high voltage power network of the present invention;
FIG. 3 is a single phase circuit diagram of the apparatus of the present invention;
FIG. 4 is a schematic structural view of a harmonic current absorbing transformer in the apparatus of the present invention as a three-phase autotransformer;
FIG. 5 is a schematic diagram of a single-phase autotransformer configuration of the harmonic current absorbing transformer of the apparatus of the present invention;
FIG. 6 is a circuit diagram of the rk module of the present invention;
FIG. 7 is a circuit diagram of an lc module of the present invention;
fig. 8 is a diagram of the detection control circuit of the present invention.
Detailed Description
Fig. 1 shows a block diagram of a three-phase power system, which is composed of a harmonic current absorption transformer (harmonic absorption transformer in fig. 1), an rk module, an lc module, a current detection I, a voltage detection U, and a control and communication module.
The primary side of the harmonic current absorption transformer is connected between a high-voltage power grid and an N (zero line), and each secondary side of the harmonic current absorption transformer is connected with N (a central point) through a rk module and an lc module which are connected in series. The current detection I and the voltage detection U collect secondary side output current and voltage of the harmonic current absorption transformer through a current sensor and a voltage sensor, and test the current passing through the rk module and the lc module and the voltage applied to two ends of the rk module and the lc module. The control and communication module analyzes and calculates the test current and voltage values, determines the value of the damping resistor, outputs a corresponding SCR (silicon controlled rectifier) trigger pulse signal in the rk module, and can also drive a contactor (mechanical switch).
The structure of the installation of the device of the invention on the column is shown in figure 2. The device adopts the installation of outdoor direct column to go up the mode, and high voltage power network harmonic absorbs and voltage fluctuation suppression device assembles into two parts: a harmonic current absorbing transformer and a damping cabinet. The upper layer is provided with a harmonic current absorption transformer, the other parts are arranged in the damping cabinet, and the lower layer is provided with the damping cabinet which is arranged on the upper and lower mounting frames. The upper layer and the lower layer are communicated by a cable pipeline. And can be installed indoors.
Fig. 3 shows a single-phase circuit diagram of the device system of the invention. The harmonic current absorption type transformer consists of a single-phase harmonic current absorption transformer, a rk module, an lc module, a current detection I, a voltage detection U and a control and communication module. The harmonic current absorbing transformer is a single-phase double-winding transformer.
The primary side of the harmonic current absorption transformer is connected to a single-phase high-voltage power grid, and the secondary side of the harmonic current absorption transformer is connected with a circuit formed by connecting the rk module and the lc module in series. The current detection I and the voltage detection U are connected with a secondary side bus of a current-absorbing transformer through a current sensor and a voltage sensor, and are used for testing the current passing through the rk module and the lc module and the voltage applied to the two ends of the rk module and the lc module. And the control and communication system module analyzes and calculates the test current and voltage values, determines the value of the damping resistor and outputs a corresponding SCR trigger pulse signal.
The harmonic current absorbing transformer in the apparatus shown in fig. 4 is a schematic electrical structure of a three-phase autotransformer.
The harmonic current absorbing transformer in the apparatus shown in fig. 5 is a schematic structural diagram of a single-phase autotransformer.
The rk module circuit diagram shown in fig. 6, rk module includes 2 resistances and 3 switches, the structure is formed by connecting 3 branches in parallel, the first branch is a single switch, the second and third branches are respectively formed by connecting 2 resistances of R1 and R2 and a switch in series, the switch can be an electronic switch formed by a pair of anti-parallel thyristor devices, also can directly select 1 ordinary mechanical switch, and form a multi-stage damping resistance structure by 3 parallel branches. SCR11 and SCR12 are connected in parallel and then connected in series with R1, SCR21 and SCR22 are connected in parallel and then connected in series with R2, and SCR31 and SCR32 are connected in parallel as shown in FIG. 6, and thereafterAnd connecting the three branches in parallel to form a multistage damping resistance circuit. The damping resistance value of the access power grid is controlled and realized by detecting and controlling thyristor trigger signals g11, g12, g21, g22, g31 and g32 sent by the control. The damping resistance value of each phase increased by the power grid is R when viewed from the side of the power distribution network H ＝K 2 (R z ) Where K is the transformer ratio of current-absorbing transformer, R Z Is the sum of 3 branch parallel resistors to realize R Z ＝0、R Z ＝R 1 、R Z ＝R 2 、R z ＝R 2 //R 1 Four states of damping resistance.
As shown in the circuit diagram of the lc module in FIG. 7, the lc module is composed of an inductor L and a capacitor C connected in parallel, and the impedance Z is due to the inductor L =2 pi fL is proportional to the frequency and therefore has a low frequency impedance, due to the capacitive impedance
Inversely proportional to frequency and therefore has a small high frequency impedance. At power frequency f =50Hz, the inductor L and the capacitor C form a parallel resonant circuit, producing a theoretically infinite impedance. A broadband harmonic absorption channel from subharmonics to high frequencies is achieved with a high fundamental impedance at the fundamental. When the power grid does not generate voltage fluctuation, flicker and harmonic amplification, the SCR is used for short-circuiting all damping resistors, and the filtering function is realized to the maximum extent.
Fig. 8 is a diagram of the detection control circuit of the present invention, which is composed of a digital signal processor system, i.e., a DSP system. The DSP inputs the detected voltage and current signals into the DSP system, the DSP system calculates the damping resistance value required by the system according to the operation conditions of the actual voltage fluctuation, current, harmonic waves and the like of the power grid and an algorithm, and then the DSP outputs control signals which are gate trigger signals g11, g12, g21, g22, g31 and g32 of 6 SCRs, so that the control of the system is realized. And these signals are transmitted by the communication module to the dispatch center.
Claims (3)
1. A high-voltage power network harmonic wave absorption and network voltage oscillation suppression device is characterized by comprising a harmonic wave current absorption transformer, a rk module, an lc module, a current detection module, a voltage detection module and a control and communication module; the primary side of the harmonic current absorption transformer is connected between a high-voltage power grid and a zero line, and each secondary side of the harmonic current absorption transformer is connected with a central point through a rk module and an lc module which are connected in series; the current detection and voltage detection module samples the secondary side output current and voltage of the harmonic current absorption transformer through a current sensor and a voltage sensor; the sampling value is sent to a control and communication module to calculate the damping resistance value required by the system, the control and communication module outputs a control signal to the rk module, and the rk module is controlled to switch so that the rk module is in different damping resistance states;
the rk module comprises 2 resistors and 3 switches, the structure is a multi-stage damping resistor structure formed by connecting 3 branches in parallel, the first branch is a single switch, and the second branch and the third branch are respectively formed by connecting 2 resistors R1 and R2 with different resistance values in series with one switch; the lc module is formed by connecting an inductor L and a capacitor C in parallel, the capacitor C forms a high-frequency path, the inductor L forms a low-frequency path, the inductor L and the capacitor C form a wide-frequency-band filter circuit after being connected in parallel, and a power capacitor C and a power inductor L form a parallel resonance high-resistance circuit at a power frequency point.
2. The harmonic absorption and network voltage oscillation suppression apparatus for high voltage power networks of claim 1 wherein the switch is selected from the group consisting of an electronic switch comprising a pair of anti-parallel thyristor devices, and a mechanical switch.
3. The harmonic absorption and network voltage oscillation suppression device for the high-voltage power network according to claim 1, wherein the device is installed in a direct pole-on manner, a harmonic current absorption transformer is installed on the upper layer, other parts of the harmonic current absorption transformer are arranged in a damping cabinet, and the damping cabinet is installed on the lower layer and is arranged on an upper installation frame and a lower installation frame; the upper layer and the lower layer are communicated by a cable pipeline.
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| CN201910015795.6A CN109768553B (en) | 2019-01-08 | 2019-01-08 | Harmonic wave absorption and network voltage oscillation suppression device for high-voltage power network |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113441Y (en) * | 2007-10-17 | 2008-09-10 | 珠海阳光伟业能源科技有限公司 | Passive dynamic response harmonic harnessing apparatus |
| CN201839003U (en) * | 2010-10-22 | 2011-05-18 | 昆明维峰电气技术开发有限公司 | Following-setting TSC resonance prevention type complete equipment for arc extinction and grounding compensation |
| CN104135005A (en) * | 2014-08-14 | 2014-11-05 | 西南交通大学 | Low-resistance and high-pass filter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201113441Y (en) * | 2007-10-17 | 2008-09-10 | 珠海阳光伟业能源科技有限公司 | Passive dynamic response harmonic harnessing apparatus |
| CN201839003U (en) * | 2010-10-22 | 2011-05-18 | 昆明维峰电气技术开发有限公司 | Following-setting TSC resonance prevention type complete equipment for arc extinction and grounding compensation |
| CN104135005A (en) * | 2014-08-14 | 2014-11-05 | 西南交通大学 | Low-resistance and high-pass filter |
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