CN101847869A - Method for decreasing voltage fluctuation - Google Patents
Method for decreasing voltage fluctuation Download PDFInfo
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- CN101847869A CN101847869A CN 201010197783 CN201010197783A CN101847869A CN 101847869 A CN101847869 A CN 101847869A CN 201010197783 CN201010197783 CN 201010197783 CN 201010197783 A CN201010197783 A CN 201010197783A CN 101847869 A CN101847869 A CN 101847869A
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Abstract
The invention relates to a method which can realize that the voltage fluctuation can be decreased when a reactive compensation capacitor or a filter of a direct-current convertor station is switched. In the method, the reference value of a TCR triggering angle is lowered or increased when an SVC receives a command that an electric power system switches a reactive group, and the consumption of the SVC to reactive power is increased or decreased, so that the reactive fluctuation on a bus bar is as small as possible; and the method can effectively suppress the voltage fluctuation caused by the switching of the reactive compensation capacitor or the filter of a transformer substation or the direct-current convertor station of the electric power system, so that the range of the fluctuation and the deviation of the steady-state value of the voltage of the system, which is caused by the condition that the transformer substation or the direct-current convertor station of the electric power system switches the reactive compensation capacitor or the filter, is greatly decreased.
Description
Technical field
The present invention relates to a kind of Static Type Dynamic Reactive Compensation Device SVC that is used for electric power system, can reduce the method for voltage fluctuation in the time of especially realizing DC converter station reactive-load compensation capacitor or filter switching.
Background technology
At present, known Static Type Dynamic Reactive Compensation Device SVC is deciding under the voltage control mode, and the response of voltage fluctuation is always lagged behind.When power system transformer substation or DC converter station switching reactive-load compensation capacitor or filter group when (being called for short idle group), because there is the response time of 20ms in SVC, decide voltage control if adopt, in the moment of idle group switching, need wait for that 20ms just can finish feedback, calculating reference value, thyristor trigger angle change output afterwards thereby decide voltage control.Therefore, to will not have inhibitory action because the change of current bus transient voltage that idle group switching causes fluctuates in the response time of SVC device 20ms, the switching of idle group can impact to system.
Summary of the invention
The purpose of this invention is to provide a kind of method that reduces voltage fluctuation, this method can effectively suppress transformer station or the reactive-load compensation capacitor of DC converter station or the voltage fluctuation that the filter switching causes of electric power system, and the scope that makes power system transformer substation or DC converter station switching reactive-load compensation capacitor or filter cause that the fluctuation of system voltage departs from steady-state value reduces greatly.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of method that reduces voltage fluctuation reduces or increases TCR trigger angle reference value when SVC receives the order of the idle group of electric power system switching, increase or reduce the consumption of SVC to reactive power, makes that the reactive power fluctuation on the bus is as far as possible little; Concrete controlled step is as follows:
First kind of situation: increase TCR trigger angle reference value when cutting the order of idle group, reduce the consumption of SVC, promptly increase the capacitive output of SVC to reactive power in the SVC system of receiving;
1) detect idle group and cut signal after, if TCR has exported more than 80% or 80% of maximum admittance value, this moment, SVC did not respond filter switching signal; System continues employing and decides voltage control;
2) detect idle group and cut signal after, if TCR output is less than 80% of maximum admittance value, after the rising edge of a pulse detection of switching signal by controller, through time-delay (adjustable) link, producing one is-1 pulse signal, and input integral device, integration initial value are 0, upper limit of integral is the difference that the maximum admittance value of TCR deducts the minimum admittance value, and can set the time of integration;
3) voltage control is decided in locking, promptly decides voltage control and no longer works, and sampling simultaneously kept the TCR admittance output valve in a lasted moment, and the output of superposition integral device on former TCR admittance output valve;
4) reach the minimum admittance value when TCR exports, time-delay is waited for a period of time (can set), and the integrator zero clearing recovers to decide voltage control;
Second kind of situation: when SVC receives the order of throwing idle group, reduce TCR trigger angle reference value, reduce the consumption of SVC, promptly increase the capacitive reactive power output of SVC to reactive power;
1) detect idle group voted signal after, detect by rising edge of a pulse, producing one is 1 pulse signal, through time delay process, input integral device, integration initial value are 0, upper limit of integral is the difference that the negative maximum admittance value of TCR deducts the minimum admittance value, can set the time of integration;
2) voltage control is decided in locking, and sampling simultaneously keeps TCR last admittance output valve constantly, the output of superposition integral device on former admittance output simultaneously;
3) reach maximum admittance value when TCR exports, time-delay is waited for a period of time (can set), and the integrator zero clearing is decided voltage control and recovered.
Compared with prior art, the invention has the beneficial effects as follows:
Suppress idle group switching in the moment of the idle group of switching by stack on SVC output admittance value and produce the needed admittance adjusted value of reactive power fluctuation, efficiently solve because SVC exists the response time of 20ms to cause the problem of lag output, thereby make that the reactive power fluctuation on the bus is as far as possible little.
Description of drawings
Fig. 1 is the schematic diagram that the idle control of instantaneous adjustment increases the output admittance amount of bias;
Fig. 2 is the control flow chart of system's idle output of instantaneous adjustment when cutting idle group.
Fig. 3 is the embodiment control flow chart of system's idle output of instantaneous adjustment when throwing idle group.
Fig. 4 is the 500kV line voltage oscillogram of throwing when not adopting instantaneous adjustment to control in the idle group process;
Fig. 5 is the idle output waveform figure of throwing when not adopting instantaneous adjustment to control in the idle group process of SVC;
Fig. 6 is the thyristor trigger angle oscillogram of throwing when not adopting instantaneous adjustment to control in the idle group process;
Fig. 7 is the idle output waveform figure of throwing when not adopting instantaneous adjustment to control in the idle group process of TCR branch road;
Fig. 8 is the 500kV line voltage oscillogram of throwing when enabling instantaneous adjustment control in the idle group process;
Fig. 9 is the idle output waveform figure of throwing when enabling instantaneous adjustment control in the idle group process of SVC;
Figure 10 is the thyristor trigger angle oscillogram of throwing when enabling instantaneous adjustment control in the idle group process;
Figure 11 is the idle output waveform figure of throwing when enabling instantaneous adjustment control in the idle group process of TCR branch road;
Figure 12 is the output admittance recruitment oscillogram of throwing when enabling instantaneous adjustment control in the idle group process;
Figure 13 is the simulation waveform figure of the idle output of the instantaneous adjustment of not enabled when cutting idle group;
Figure 14 is the 500kV line voltage oscillogram that does not start the idle output of instantaneous adjustment when cutting idle group;
Figure 15 is the idle output waveform figure of SVC that does not start the idle output of instantaneous adjustment when cutting idle group;
Figure 16 is the thyristor trigger angle oscillogram that does not start the idle output of instantaneous adjustment when cutting idle group;
Figure 17 is the idle output waveform figure of TCR branch road that does not start the idle output of instantaneous adjustment when cutting idle group;
Figure 18 is the 500kV line voltage oscillogram that starts the idle output of instantaneous adjustment when cutting idle group;
Figure 19 is the idle output waveform figure of SVC that starts the idle output of instantaneous adjustment when cutting idle group;
Figure 20 is the thyristor trigger angle oscillogram that starts the idle output of instantaneous adjustment when cutting idle group;
Figure 21 is the idle output waveform figure of TCR branch road that starts the idle output of instantaneous adjustment when cutting idle group;
Figure 22 is the admittance increment oscillogram that starts the idle output of instantaneous adjustment when cutting idle group.
Embodiment
Because there is the response time of 20ms in SVC, decide voltage control if adopt, power system transformer substation during this or current conversion station high voltage bus transient voltage are fluctuateed no effect, may impact to system, therefore at this moment SVC should reduce or increase TCR trigger angle reference value when receiving the order of the idle group of switching, the output that increases or reduce SVC is idle, makes that the reactive power fluctuation on the bus is as far as possible little.
See Fig. 1, fluctuate when excessive at system voltage, for voltage being followed the tracks of adjusting fast, control loop locking, the not signal of the idle group of responding system switching.During for fear of the locking of direct current single-stage, because DC bus-bar voltage is too high, the interior idle group in station this moment need excise in this case, instantaneous adjustment output is idle may to produce minus effect to system, in control, increase for this reason and judge, if exported TCR at this moment reach 80% idle (adjustable) of maximum inductive and more than, control system is no longer made response to the signal of the idle group of switching of system.The controller system of receiving wants to judge whether to satisfy response condition behind the signal of switching filter, just obtain current susceptance reference value by sampling-maintenance link immediately if satisfy condition, add the susceptance reference value of the susceptance value of the required variation of idle group's switching that calculates as output.
See Fig. 2, Fig. 3, a kind of method that reduces voltage fluctuation, this method comprises the steps:
1) detect idle group and cut signal after, if TCR output this moment reach (adjustable) maximum admittance value 80% or more than, signal is cut by idle group does not respond.
2) if TCR output this moment less than maximum inductive idle 80%, detect by rising edge of a pulse, through 100ms (adjustable) time delay process, producing one is-1 pulse signal, input integral device, integration initial value are 0, and upper limit of integral is the difference that the maximum admittance value of TCR deducts the minimum admittance value.Be 100-150ms (can set) time of integration;
3) voltage control is decided in locking, and sampling simultaneously kept the admittance output valve in a last moment, and increases the output of integrator on former admittance output;
4) reach the minimum admittance value when TCR exports, continue 100-150ms (can set), the integrator zero clearing is decided voltage control and is recovered;
5) detect idle group voted signal after, detect by rising edge of a pulse, producing one is 1 pulse signal, through 100ms (adjustable) time delay process, the input integral device, the integration initial value is 0, and upper limit of integral is the maximum admittance value of negative TCR-minimum admittance value, and be 100-150ms (can set) time of integration;
6) voltage control is decided in locking, and sampling simultaneously kept the admittance output valve in a last moment, increases the output of integrator simultaneously on former admittance output;
7) reach maximum admittance value when TCR exports, continue 100-150ms (can set), the integrator zero clearing is decided voltage control and is recovered.
Chuxiong current conversion station SVC is an example with the wide extra-high voltage direct-current transmission of south electric network cloud, and Fig. 4-Fig. 7 is the waveform of throwing when not adopting instantaneous adjustment to control in the idle group process.Send the idle group of throwing ready signal constantly at 3s, move at 3.3s.
Fig. 8-Figure 12 starts to throw the simulation waveform that idle group adjusts control moment; Fig. 8 is the 500kV line voltage oscillogram of throwing when enabling instantaneous adjustment control in the idle group process; Can see that SVC output adjustment has in the other direction in advance reduced idle group effectively and thrown the amplitude that the voltage fluctuation that causes departs from stationary value.
Fig. 9 is the idle output waveform figure of throwing when enabling instantaneous adjustment control in the idle group process of SVC; Can see that reactive power fluctuation when output offset has in advance reduced idle group effectively and throws departs from the amplitude of stationary value.
Figure 10 is the thyristor trigger angle oscillogram of throwing when enabling instantaneous adjustment control in the idle group process; Before idle group drops into, changed in advance and waited for that idle group drops into.
Figure 11 is the idle output waveform figure of throwing when enabling instantaneous adjustment control in the idle group process of TCR branch road.
Figure 12 is the output admittance recruitment oscillogram of throwing when enabling instantaneous adjustment control in the idle group process.
From above comparison of wave shape as can be seen, throwing the voltage fluctuation of idle group when not adopting instantaneous adjustment control, to depart from the amplitude of stationary value bigger, voltage waveform changes more violent, but because the capacity of Chuxiong SVC is less with respect to idle little pool-size in the station, adjustable idle amount is less relatively, and because in running, SVC always is not under the idle standby situation of maximum adjustable, therefore effect is not clearly.
Figure 13-Figure 17 is when cutting idle group, does not start the simulation waveform figure of the idle output of instantaneous adjustment.
Figure 18-Figure 22 is when cutting idle group, starts the oscillogram of the idle adjustment control of instantaneous adjustment.
Claims (1)
1. a method that reduces voltage fluctuation is characterized in that, reduces or increase TCR trigger angle reference value when SVC receives the order of the idle group of switching, increases or reduces the consumption of SVC to reactive power, makes that the reactive power fluctuation on the bus is as far as possible little; Concrete controlled condition is as follows:
First kind of situation:
1) detect idle group and cut signal after, if TCR exports more than 80% or 80% of maximum admittance value, SVC cut signal to idle group and did not respond this moment; System adopts and decides voltage control;
2) detect idle group and cut signal after, if TCR output is less than 80% of maximum admittance value, detect by rising edge of a pulse, through time delay process, producing one is-1 pulse signal, and input integral device, integration initial value are 0, upper limit of integral is the difference that the maximum admittance value of TCR deducts the minimum admittance value, and can set the time of integration;
3) voltage control is decided in locking, and sampling simultaneously keeps TCR last admittance output valve constantly, the output of superposition integral device on former admittance output valve simultaneously;
4) reach the minimum admittance value when TCR exports, time-delay is waited for a period of time, and the integrator zero clearing is decided voltage control and recovered;
Second kind of situation:
1) detect idle group voted signal after, detect by rising edge of a pulse, producing one is 1 pulse signal, through time delay process, input integral device, integration initial value are 0, upper limit of integral is the difference that the negative maximum admittance value of TCR deducts the minimum admittance value, can set the time of integration;
2) voltage control is decided in locking, and sampling simultaneously keeps TCR last admittance output valve constantly, the output of superposition integral device on former admittance output simultaneously;
3) reach maximum admittance value when TCR exports, time-delay is waited for a period of time, and the integrator zero clearing is decided voltage control and recovered.
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| CN 201010197783 CN101847869A (en) | 2010-06-11 | 2010-06-11 | Method for decreasing voltage fluctuation |
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| CN 201010197783 CN101847869A (en) | 2010-06-11 | 2010-06-11 | Method for decreasing voltage fluctuation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995013A (en) * | 2019-03-27 | 2019-07-09 | 北京宇航系统工程研究所 | A method of promoting the long line power supply dynamic response performance of aircraft |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080001581A1 (en) * | 2006-06-28 | 2008-01-03 | Mitsubishi Electric Corporation | Control System for Static VAR Compensator |
| CN101162841A (en) * | 2007-10-18 | 2008-04-16 | 湖南大学 | Non-linearity PI voltage control method of stillness reactive compensator |
-
2010
- 2010-06-11 CN CN 201010197783 patent/CN101847869A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080001581A1 (en) * | 2006-06-28 | 2008-01-03 | Mitsubishi Electric Corporation | Control System for Static VAR Compensator |
| CN101162841A (en) * | 2007-10-18 | 2008-04-16 | 湖南大学 | Non-linearity PI voltage control method of stillness reactive compensator |
Non-Patent Citations (3)
| Title |
|---|
| 《2008年中国电机工程学会年会论文集》 20081118 胡铭等 利用SVC改善特高压直流系统运行性能实时数字仿真研究 , 2 * |
| 《南方电网技术》 20100131 韩传鼎 500kV梧州变电站静止无功补偿装置在电压及慢速导纳控制下的行为分析 第4卷, 第1期 2 * |
| 《电气技术》 20100430 郑祎群 基于瞬时无功功率理论的SVC系统研究与Matlab仿真 , 第4期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995013A (en) * | 2019-03-27 | 2019-07-09 | 北京宇航系统工程研究所 | A method of promoting the long line power supply dynamic response performance of aircraft |
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Open date: 20100929 |