CN102231526A - Method for suppressing low-frequency oscillation of voltage of power distribution network - Google Patents
Method for suppressing low-frequency oscillation of voltage of power distribution network Download PDFInfo
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Abstract
The invention relates to a method for inhibiting low-frequency oscillation of voltage of a power distribution network, which is characterized in that an SVG device is directly connected on a power grid in parallel through a reactor, and the SVG device outputs inter-harmonic current to change the equivalent impedance of a system through detecting the inter-harmonic current in the power grid and controlling the harmonic current in a link so as to inhibit the low-frequency oscillation of the voltage of the power distribution network. The method adopts a fully-controlled converter SVG structure, outputs instruction current through the given SVG, changes the equivalent impedance of the power grid through a PID regulator, can effectively inhibit the low-frequency oscillation of the voltage at the side of the power distribution grid, has high response speed and high tracking precision, and can greatly improve the stability and reliability of the power grid.
Description
Technical field
The present invention relates to a kind of inhibition power distribution network voltage low-frequency oscillation method, particularly adopt the distribution voltage on line side low-frequency oscillation inhibition method of full-control type current device SVG device.
Background technology
Along with the expansion day by day of scale of power and the sharp increase of network load level, harmonic problem becomes increasingly conspicuous.The harmonic signal that exists in the load current might with the reactive power compensator generation resonance in network system impedance or the system, cause that resonance amplifies phenomenon, causes the load overvoltage protection.Harmonic current is often referred to the harmonic wave of mains frequency integral multiple, but also has non-integral multiple harmonic wave, is called a harmonic wave.Be positioned near the mains frequency between when harmonic wave and electric network impedance generation resonance, the difference that the line voltage amplitude will occur with a mains frequency and a harmonic frequency is the low-frequency oscillation of frequency of oscillation.
At present, suppress line voltage low-frequency oscillation major measure configuration power system stabilizer, PSS (PSS), configuration controllable silicon series compensator (TCSC) and configuration Static Var Compensator (SVC) etc. are arranged.PSS, TCSC and SVC are to the stability that the raising system can be arranged, the effect that suppresses the line voltage low-frequency oscillation, when taking into full account comprehensive benefit, the PSS technology is better than TCSC and SVC, be most economical effective measures, but PSS is limited to local local message, lack the dynamic coordinate ability, thereby seriously limited the effect of PSS inhibition low-frequency oscillation.
At present, adopt high voltage static reacance generator SVG (Static Var Generator) the technology inhibition line voltage low-frequency oscillation of full-control type current device also to belong to blank at home and abroad, and along with the performance of power electronic device improves and the cost reduction, the cost that with the device for high-power power electronic is the SVG device of core component can reduce, therefore, SVG solution at suppressing power distribution network voltage low-frequency oscillation problem has very strong exploitativeness, operability and competitiveness.
Summary of the invention
The purpose of this invention is to provide a kind of power distribution network voltage low-frequency oscillation inhibition method, this method adopts full-control type current device SVG structure, harmonic current between in the detection of grid, make harmonic current between SVG output change the equiva lent impedance of system by the harmonic current controlling unit, can effectively suppress the low-frequency oscillation of distribution voltage on line side, and response speed is fast, and the tracking accuracy height can improve the stability and the reliability of electrical network greatly.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of power distribution network voltage low-frequency oscillation inhibition method, with the SVG device by reactor or be directly parallel on the electrical network, harmonic current between in the detection of grid, make harmonic current between SVG output change the equiva lent impedance of system by the harmonic current controlling unit, suppress power distribution network voltage low-frequency oscillation.
Described harmonic current detecting method is: according to power network current fundamental frequency ω
0With a harmonic current frequencies omega
1Calculate reference frequency ω
f, described reference frequency ω
fBe the current first harmonics frequencies omega
0With a harmonic current frequencies omega
1Common divisor, i.e. ω
0=k
0ω
f, ω
1=k
1ω
f, k wherein
0, k
1Be integer; With ω
fFor reference frequency extract in the power network current between harmonic component.
Described harmonic current controlling unit is made FEEDBACK CONTROL by pi regulator with instruction current and SVG device output current, obtains modulation wave signal, obtains drive signal through the PWM modulation again; Control SVG output order electric current
According to circuital law, obtain following formula:
Will
Substitution obtains mains by harmonics voltage and is shown below:
Be that the electrical network equiva lent impedance is Z
s/ (1+K),, change system's equiva lent impedance by changing the K value, thus voltage ripple of power network suppressed; In the formula: Z
sBe electric network impedance,
Be mains by harmonics voltage,
i
c,
Be respectively harmonic current between electrical network, SVG output current, load harmonic current; The round numbers of K value.
Described SVG device is voltage-dropping type two level power unit parallel connection type SVG structures or voltage-dropping type three level power unit parallel connection type SVG structures; Or voltage-dropping type Δ type chain type SVG structure or voltage-dropping type Y type chain type SVG structure.
Described SVG device is voltage-dropping type MMC type SVG structure or multipleization of voltage-dropping type SVG structure.
Described full SVG device is non-voltage-dropping type device tandem type two level SVG structures or non-voltage-dropping type device tandem type three level SVG structures.
Described full SVG device is direct hanging type Δ type chain type SVG structure, direct hanging type Y type chain type SVG structure or direct hanging type MMC type SVG structure.
Compared with prior art, the invention has the beneficial effects as follows:
This method adopts full-control type current device SVG structure, harmonic current between in the detection of grid, with the SVG device by reactor or be directly parallel on the electrical network, harmonic current between in the detection of grid, make harmonic current between SVG output change the equiva lent impedance of system by the harmonic current controlling unit, suppress power distribution network voltage low-frequency oscillation.Response speed is fast, and the tracking accuracy height can improve the stability and the reliability of electrical network greatly.Also comprise following advantage:
1) response speed is fast
Distinguishing feature based on full-control type device convertor assembly is exactly that response speed is fast.Its main cause is to control arbitrarily the on off state of full-control type device (IGBT, IGCT etc.) as required.And the switching frequency of device or equivalent switching frequency are often higher, and generally the switch number of times of each power frequency period can be from several times to tens times.
2) compensation range is wide
Compensation range based on full-control type current device convertor assembly can reach-100%～100%, proposes more powerful guarantee for the stable operation of electric power system.
3) filled up the technological gap that utilizes full-control type device Semiconductor Converting Technology to suppress the line voltage low-frequency oscillation, suppressed having response speed fast aspect the low-frequency oscillation, advantage such as volume is little, and is with low cost.
Description of drawings
Fig. 1 is a three-phase distribution net voltage low-frequency oscillation restraining device block diagram;
Fig. 2 is a harmonic wave principle schematic between the SVG device suppresses;
Fig. 3 is that three phase harmonic detects the link schematic diagram;
Fig. 4 is that single-phase harmonic wave detects the link schematic diagram;
Fig. 5 is three-phase SVG output current tracking Control and PWM modulation link structure chart;
Fig. 6 is single-phase SVG output current tracking Control and PWM modulation link structure chart;
Fig. 7 is three-phase step-down type two level power unit parallel connection type SVG structural representations;
Fig. 8 is single-phase voltage-dropping type two level power unit parallel connection type SVG structural representations;
Fig. 9 is three-phase step-down type three level power unit parallel connection type SVG structural representations;
Figure 10 is single-phase voltage-dropping type three level power unit parallel connection type SVG structural representations;
Figure 11 is a voltage-dropping type Δ type chain type SVG structural representation;
Figure 12 is a voltage-dropping type Y type chain type SVG structural representation;
Figure 13 is single-phase voltage-dropping type chain type SVG structural representation;
Figure 14 is a three-phase step-down type MMC type SVG structural representation;
Figure 15 is single-phase voltage-dropping type MMC type SVG structural representation;
Figure 16 is multipleization of a voltage-dropping type SVG structural representation;
Figure 17 is the non-voltage-dropping type device of three-phase tandem type two level SVG structural representations;
Figure 18 is single-phase non-voltage-dropping type device tandem type two level SVG structural representations;
Figure 19 is the non-voltage-dropping type device of three-phase tandem type three level SVG structural representations;
Figure 20 is single-phase non-voltage-dropping type device tandem type three level SVG structural representations;
Figure 21 is a direct hanging type Δ type chain type SVG structural representation;
Figure 22 is a direct hanging type Y type chain type SVG structural representation;
Figure 23 is single-phase direct hanging type chain type SVG structural representation;
Figure 24 is a three-phase direct hanging type MMC type SVG structural representation;
Figure 25 is single-phase direct hanging type MMC type SVG structural representation.
Embodiment
Be described in detail embodiment of the present utility model below in conjunction with accompanying drawing.
See Fig. 1, a kind of power distribution network voltage low-frequency oscillation inhibition method, with the SVG device by reactor or be directly parallel on the electrical network, by harmonic current between in the detection of grid, make harmonic current between SVG output change the equiva lent impedance of system by the harmonic current controlling unit, suppress power distribution network voltage low-frequency oscillation.
Fig. 2 is a harmonic wave principle schematic between the SVG device suppresses.The harmonic current controlling unit is made FEEDBACK CONTROL by pi regulator with instruction current and SVG device output current, obtains modulation wave signal, obtains drive signal through the PWM modulation again; Control SVG output order electric current
According to circuital law, obtain following formula:
Will
Substitution obtains mains by harmonics voltage and is shown below:
Be that the electrical network equiva lent impedance is Z
s/ (1+K),, change the electrical network equiva lent impedance by changing the K value, thus voltage ripple of power network suppressed; In the formula: Z
sBe electric network impedance,
Be mains by harmonics voltage,
i
c,
Be respectively harmonic current between electrical network, SVG output current, load harmonic current; The round numbers of K value.
Fig. 3 is a three phase harmonic current detecting link schematic diagram, and a harmonic current detecting method is: according to power network current fundamental frequency ω
0With a harmonic current frequencies omega
1Calculate reference frequency ω
f, described reference frequency ω
fBe the current first harmonics frequencies omega
0With a harmonic current frequencies omega
1Common divisor, i.e. ω
0=k
0ω
f, ω
1=k
1ω
f, k wherein
0, k
1Be integer; With ω
fFor reference frequency extract in the power network current between harmonic component, this harmonic wave detection algorithm is based on the instantaneous reactive theory.
Fig. 4 is that single-phase harmonic current detects the link schematic diagram, and at first the A phase current with the electrical network input obtains B, C phase current behind phase shift 120 degree, 240 degree respectively, carries out harmonic wave according to three phase harmonic detection ring joint opinion then and detects.
Fig. 5 is three-phase SVG output current tracking Control and PWM modulation link structure chart.Current regulator adopts pi regulator, SVG instruction current and SVG output current are made FEEDBACK CONTROL, obtain modulation wave signal, modulation obtains pwm pulse to modulation wave signal through PWM, pwm pulse is delivered to the SVG power cell, drives the IGBT power device through overdrive circuit.
Fig. 6 is single-phase SVG output current tracking Control and PWM modulation link structure chart.Current regulator adopts pi regulator, and instruction current and SVG output current are made FEEDBACK CONTROL, obtains modulation wave signal, and modulation obtains pwm pulse to modulation wave signal through PWM, and pwm pulse is delivered to power cell, drives the IGBT power device through overdrive circuit.
Fig. 7 is three-phase step-down type two level power unit parallel connection type SVG structural representations; Power cell is every to be made up of two inverse parallel switching device IGBT1, diode D1 rectification, and whole power model forms two level current transformer functions.
Three-phase step-down type two level power unit parallel connection type SVG are by the power cell parallel connection of adopting two level current transformers, rise to high-voltage parallel on electrical network by transformer T1 then.
Fig. 8 is single-phase voltage-dropping type two level power unit parallel connection type SVG structural representations; Power cell is every to be made up of two inverse parallel switching device IGBT2, diode D2 stream, and whole power model forms two level current transformer functions.
Single-phase voltage-dropping type two level power unit parallel connection type SVG are by the power cell parallel connection of adopting two level current transformers, rise to high-voltage parallel on electrical network by transformer T2 then.
Fig. 9 is three-phase step-down type three level power unit parallel connection type SVG structural representations; Power cell is every to be made up of four inverse parallel switching device IGBT3, diode D3 clamper, and whole power model forms the three-level current transformer function.
Three-phase step-down type three level power unit parallel connection type SVG are by the power cell parallel connection of the three-level current transformer that adopts diode D3 clamper, rise to high-voltage parallel on electrical network by transformer T3 then.
Figure 10 is single-phase voltage-dropping type three level power unit parallel connection type SVG structural representations.Power cell is every to be made up of four inverse parallel switching device IGBT4, diode D4 clamper, and whole power model forms the three-level current transformer function.
Three-phase step-down type three level power unit parallel connection type SVG are by the power cell parallel connection of the three-level current transformer that adopts diode D4 clamper, rise to high-voltage parallel on electrical network by transformer T4 then.
Figure 11 is a voltage-dropping type Δ type chain type SVG structural representation; Individual event power cell A1 is every to be made up of four inverse parallel switching device IGBT5, diode D5 rectification, and whole power model forms the three-level current transformer function.
Voltage-dropping type Δ type chain type SVG is connected in series to the certain voltage grade by individual event power cell A1, and the three-phase Δ connects the back and rises to high-voltage parallel on electrical network by transformer T5.
Figure 12 is a voltage-dropping type Y type chain type SVG structural representation; Individual event power cell A2 is every to be made up of four inverse parallel switching device IGBT6, diode D6 rectification, and whole power model forms the three-level current transformer function.
Voltage-dropping type Y type chain type SVG is connected in series to the certain voltage grade by individual event power cell A2, rises to high-voltage parallel on electrical network by transformer T6 behind the three-phase Y connection.
Figure 13 is single-phase voltage-dropping type chain type SVG structural representation.Individual event power cell A3 is every to be made up of four inverse parallel switching device IGBT7, diode D7 rectification, and whole power model forms the three-level current transformer function.Single-phase voltage-dropping type chain type SVG is connected in series to the certain voltage grade by individual event power cell A3, rises to high-voltage parallel on electrical network by transformer T7.
Figure 14 is a three-phase step-down type MMC type SVG structural representation; The abbreviation of modular multilevel current transformer (Modular Multilevel Converter) is a MMC type current transformer.MMC type current transformer and three-phase bridge current transformer are similar.Each brachium pontis is composed in series by a plurality of single-phase semi-bridge A4 that IGBT8 forms, and each brachium pontis mid point inserts step-down transformer T8 secondary side behind reactor L1.
Figure 15 is single-phase voltage-dropping type MMC type SVG structural representation; Each brachium pontis is composed in series by a plurality of half-bridge A5 that IGBT9 forms, and each brachium pontis mid point inserts step-down transformer T9 secondary side behind reactor L2.
Figure 16 is multipleization of a voltage-dropping type SVG structural representation; Multipleization of voltage-dropping type SVG is made up of a plurality of transformer T1, T2......Tn, and wherein, all current transformers 10 can shared one or more dc capacitor C, also can dispose electric capacity separately, and the effect of electric capacity is to provide operate as normal required direct voltage to current transformer.Current transformer 10 is made of three with common DC bus single-phase H bridges usually, and the output of each H bridge is connected to the low-pressure side of transformer.In the high-pressure side of each transformer, corresponding incorporate system into after respectively being in series.In addition, the method for the former secondary phase shift of transformer is adopted in the influence that the low-order harmonic that produces for the cancellation current transformer causes electrical network usually, connect as Y/Y, or the Y/ Δ connects (as Figure 16).
Figure 17 is the non-voltage-dropping type device of three-phase tandem type two level SVG structural representations; Non-voltage-dropping type device tandem type two level SVG form high-voltage power unit A6 by power device IGBT10 series connection earlier, and the high-voltage power unit A6 of these power device series connection reconstructs the output of two level and inserts electrical network then.Non-voltage-dropping type device tandem type two level SVG mainly are made up of power device Series Sheet unit, control unit, access reactor.
Figure 18 is single-phase non-voltage-dropping type device tandem type two level SVG structural representations.Form high-voltage power unit A7 by power device IGBT11 series connection earlier, the high-voltage power unit A7 of these power device series connection reconstructs the output of two level and inserts electrical network then.
Figure 19 is the non-voltage-dropping type device of three-phase tandem type three level SVG structural representations; Non-voltage-dropping type device tandem type three level SVG form high-voltage power unit A8 by power device IGBT12 series connection earlier, and the high-voltage power unit A8 of these power device series connection reconstructs the output of three level and inserts electrical network then.Non-voltage-dropping type device tandem type three level SVG mainly are made up of power device Series Sheet unit, control unit, access reactor.
Figure 20 is single-phase non-voltage-dropping type device tandem type three level SVG structural representations.Non-voltage-dropping type device tandem type three level SVG form high-voltage power unit A9 by power device IGBT13 series connection earlier, and the high-voltage power unit A9 of these power device series connection reconstructs the output of three level and inserts electrical network then.
Figure 21 is a direct hanging type Δ type chain type SVG structural representation; Individual event power cell A10 is every to be made up of four inverse parallel switching device IGBT14, diode D8 rectification, and whole power model forms the three-level current transformer function.
Direct hanging type Δ type chain type SVG directly is connected in series to voltage levels by individual event power cell A10, and the three-phase Δ connects the back and directly inserts electrical network.Direct hanging type Δ type chain type SVG mainly is made up of power cell, control unit, access reactor.
Figure 22 is a direct hanging type Y type chain type SVG structural representation; Individual event power cell A11 is every to be made up of four inverse parallel switching device IGBT 15, diode D9 rectification, and whole power model forms the three-level current transformer function.
Direct hanging type Y type chain type SVG directly is connected in series to voltage levels by individual event power cell A11, directly inserts electrical network behind the three-phase Y connection.Direct hanging type Y type chain type SVG mainly is made up of power cell, control unit, access reactor.
Figure 23 is single-phase direct hanging type chain type SVG structural representation.Individual event power cell A12 is every to be made up of four inverse parallel switching device IGBT16, diode D10 rectification, and whole power model forms the three-level current transformer function.
Figure 24 is a three-phase direct hanging type MMC type SVG structural representation; Each brachium pontis of MMC type current transformer is composed in series by a plurality of individual event half-bridge A13, and each brachium pontis mid point directly inserts electrical network through reactor L3, does not need step-down transformer.
Figure 25 is single-phase direct hanging type MMC type SVG structural representation; Each brachium pontis of MMC type current transformer is composed in series by a plurality of individual event half-bridge A14, and each brachium pontis mid point directly inserts electrical network through reactor L4, does not need step-down transformer.
Claims (7)
1. power distribution network voltage low-frequency oscillation inhibition method, it is characterized in that, with the SVG device by reactor or be directly parallel on the electrical network, harmonic current between in the detection of grid, make harmonic current between SVG output change the equiva lent impedance of system by the harmonic current controlling unit, suppress power distribution network voltage low-frequency oscillation.
2. a kind of power distribution network voltage low-frequency oscillation inhibition method according to claim 1 is characterized in that described harmonic current detecting method is: according to power network current fundamental frequency ω
0With a harmonic current frequencies omega
1Calculate reference frequency ω
f, described reference frequency ω
fBe the current first harmonics frequencies omega
0With a harmonic current frequencies omega
1Common divisor, i.e. ω
0=k
0ω
f, ω
1=k
1ω
f, k wherein
0, k
1Be integer; With ω
fFor reference frequency extract in the power network current between harmonic component.
3. a kind of power distribution network voltage low-frequency oscillation inhibition method according to claim 1, it is characterized in that, described harmonic current controlling unit is made FEEDBACK CONTROL by pi regulator with instruction current and SVG device output current, obtains modulation wave signal, obtains drive signal through the PWM modulation again; Control SVG output order electric current
According to circuital law, obtain following formula:
Will
Substitution obtains mains by harmonics voltage and is shown below:
Be that the electrical network equiva lent impedance is Z
s/ (1+K),, change system's equiva lent impedance by changing the K value, thus voltage ripple of power network suppressed; In the formula: Z
sBe electric network impedance,
Be mains by harmonics voltage,
i
c,
Be respectively harmonic current between electrical network, SVG output current, load harmonic current; The round numbers of K value.
4. a kind of power distribution network voltage low-frequency oscillation inhibition method according to claim 1 is characterized in that, described SVG device is voltage-dropping type two level power unit parallel connection type SVG structures or voltage-dropping type three level power unit parallel connection type SVG structures; Or voltage-dropping type Δ type chain type SVG structure or voltage-dropping type Y type chain type SVG structure.
5. a kind of power distribution network voltage low-frequency oscillation inhibition method according to claim 1 is characterized in that, described SVG device is voltage-dropping type MMC type SVG structure or multipleization of voltage-dropping type SVG structure.
6. a kind of power distribution network voltage low-frequency oscillation inhibition method according to claim 1 is characterized in that, described full SVG device is non-voltage-dropping type device tandem type two level SVG structures or non-voltage-dropping type device tandem type three level SVG structures.
7. a kind of power distribution network voltage low-frequency oscillation inhibition method according to claim 1 is characterized in that, described full SVG device is for being direct hanging type Δ type chain type SVG structure, direct hanging type Y type chain type SVG structure or direct hanging type MMC type SVG structure.
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| CN102646992A (en) * | 2012-04-16 | 2012-08-22 | 荣信电力电子股份有限公司 | Power grid fault isolating system for clean energy grid connection |
| CN108226587A (en) * | 2018-03-19 | 2018-06-29 | 中煤科工集团重庆研究院有限公司 | Mining high-low pressure reactive power and harmonic compensation device based on opposition method |
| CN108432108A (en) * | 2015-12-18 | 2018-08-21 | Abb瑞士股份有限公司 | The balance of voltage in modular multilevel converter with triangular arrangement |
| CN110739704A (en) * | 2019-10-28 | 2020-01-31 | 贵州电网有限责任公司 | control method for restraining low-frequency oscillation operation risk of power distribution network |
| CN111725820A (en) * | 2020-06-24 | 2020-09-29 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Device for restraining low-frequency oscillation of power grid based on high-order momentum tracking control |
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| CN108432108A (en) * | 2015-12-18 | 2018-08-21 | Abb瑞士股份有限公司 | The balance of voltage in modular multilevel converter with triangular arrangement |
| US10855199B2 (en) | 2015-12-18 | 2020-12-01 | Abb Power Grids Switzerland Ag | Voltage balancing in a Modular Multilevel Converter having delta configuration |
| CN108226587A (en) * | 2018-03-19 | 2018-06-29 | 中煤科工集团重庆研究院有限公司 | Mining high-low pressure reactive power and harmonic compensation device based on opposition method |
| CN108226587B (en) * | 2018-03-19 | 2020-10-27 | 中煤科工集团重庆研究院有限公司 | Mining high-low voltage reactive power and harmonic compensation device based on cancellation method |
| CN110739704A (en) * | 2019-10-28 | 2020-01-31 | 贵州电网有限责任公司 | control method for restraining low-frequency oscillation operation risk of power distribution network |
| CN111725820A (en) * | 2020-06-24 | 2020-09-29 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Device for restraining low-frequency oscillation of power grid based on high-order momentum tracking control |
| CN111725820B (en) * | 2020-06-24 | 2022-06-21 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Device for restraining low-frequency oscillation of power grid based on high-order momentum tracking control |
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