CN104993493A - Low-load reactive power optimization method of common-tower double-circuit DC power transmission system - Google Patents
Low-load reactive power optimization method of common-tower double-circuit DC power transmission system Download PDFInfo
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- CN104993493A CN104993493A CN201410477045.8A CN201410477045A CN104993493A CN 104993493 A CN104993493 A CN 104993493A CN 201410477045 A CN201410477045 A CN 201410477045A CN 104993493 A CN104993493 A CN 104993493A
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Abstract
The invention discloses a low-load reactive power optimization method of a common-tower double-circuit DC power transmission system, belonging to the DC power transmission system control technical field, and is especially suitable for the low-load reactive power control of a common-tower double-circuit DC power transmission system. The method comprises the steps of: 1) fixing a converter transformer tap gear; and 2) increasing a rectification side trigger angle and an inversion side turn-off angle. According to the reactive power consumption condition of a converter station, the method realizes reactive power balance optimization in the converter station through fixing the converter transformer tap gear and increasing the rectification side trigger angle and the inversion side turn-off angle. The method is in favor of convertor station reactive power balance and AC system fault recovery in the low-load operation of a DC power transmission system, and has little effect on the harmonic wave quality of an AC system.
Description
Technical field
The present invention is a kind of one-tower double-circuit DC transmission system underload idle work optimization method, belongs to the innovative technology of one-tower double-circuit DC transmission system underload idle work optimization method.
Background technology
Current conversion station reactive power compensation and voltage control strategy to the voltage control of HVDC (High Voltage Direct Current) transmission system and neighbouring plant stand thereof and system safety stable operation most important.On the one hand, from the angle that DC stabilization is run, rational reactive power compensation and voltage control strategy are one of necessary conditions ensureing that direct current runs continually and steadily; On the other hand, from the angle of electrical network, can utilize DC transmission system fast, flexibly controllability carry out AC system regulating and controlling voltage, enrich line voltage control measures, improve system voltage stabilizes, for DC stabilization run need system voltage give security.High voltage direct current underload idle work optimization function is that current conversion station carries out reactive power compensation and voltage-controlled a kind of important means, can regard a kind of special case of the idle modulation function of direct current as.
Because sending end unit operation needs a process, high voltage DC engineering needs low power run after going into operation for some time; The seasonality generating of upper water power station also may require that direct current low-power is carried; In order to meet AC system waveform requirements, current conversion station must drop into minimum bank of filters; Receiving end electrical network unit limited amount, it is idle also limited that unit leading phase operation is drawn.Due to above-mentioned many factors, the problem that during direct current system low power run, receiving end line voltage is too high is quite severe, in the urgent need to studying the method effectively alleviated.
Summary of the invention
The object of the invention is to for solving the problem and providing a kind of one-tower double-circuit DC transmission system underload idle work optimization method.The present invention takes fixing change of current variation joint gear according to the reactive power exchange principle in current conversion station, increase the idle control strategy of rectification side Trigger Angle and the inverter side pass angle of rupture, to realize reactive balance in current conversion station, reducing idle residue causes voltage to raise the risk brought, for the reliability service of ac and dc systems is given security.
Technical scheme of the present invention is: one-tower double-circuit DC transmission system underload idle work optimization method of the present invention, comprises the steps:
1) fixing change of current variation joint gear;
2) rectification side Trigger Angle and the inverter side pass angle of rupture is increased.
One-tower double-circuit DC transmission system underload idle work optimization method is that common-tower double-return direct current system is run under low load condition, the direct current power of DC transmission system conveying is less than 0.2p.u., now, DC transmission system is subject to the effect of absolute minimum filters switching logic, minimum filters group must be dropped into, thus may cause occurring a large amount of idle residue in current conversion station.
Above-mentioned steps 1) under identical direct current transmission power and inverter side close the condition of the angle of rupture, regulate the impact of change of current variation joint gear on current conversion station reactive balance negligible.Therefore, change of current variation joint is positioned at any gear and is all fine theoretically.But from the transient recovery of AC system and the lifting angle of direct current transmission power, the gear of change of current variation joint is more high better.But the gear of change of current variation joint can not arrange again too high, because inherently there is system voltage too high risk during HVDC (High Voltage Direct Current) transmission system underrun.Therefore, change of current variation joint is preferably fixed on intervening gears.
Above-mentioned steps 1) set point of change of current shift position is input in the control logic of system when in advance direct current system being operated in underload.
Above-mentioned steps 2) in advance the set point of rectification side Trigger Angle during direct current underrun and the inverter side pass angle of rupture is input in the control logic of system, different direct current transmission powers sets different inverter side and closes the angle of rupture, by the object regulating the reactive power consumption on converter to reach reactive balance in current conversion station.
Above-mentioned steps 2) increase rectification side Trigger Angle and inverter side when closing the angle of rupture, the major loop equipment such as the equal hydraulic circuit of converter valve damping, smoothing reactor, DC filter all subject than electric stress larger under normal angled scope.But DC transmission system is when underrun, and direct current is less, increases and close electric stress also corresponding reduction caused by the angle of rupture, converter valve long-play, under the comparatively high point angle of rupture, can not produce a very large impact the life-span of respective electric equipment.
Above-mentioned steps 2) in rectification side Trigger Angle and the inverter side set point of closing the angle of rupture by direct current system produce harmonic content number, direct current system transmission power size determine, should avoid causing due to the increase of Trigger Angle/pass angle of rupture inverter side bank of filters too much to throw because of harmonic content more, cause more how idle remaining phenomenon.
The present invention is in order to be optimized the idle control strategy of one-tower double-circuit DC transmission system, propose a kind of underload powerless control method, the method comprises following steps: fixing change of current variation joint gear, increases rectification side Trigger Angle and the inverter side pass angle of rupture simultaneously.The underload idle work optimization method of one-tower double-circuit DC transmission system of the present invention can realize reactive balance in current conversion station, reduces idle residue and causes voltage to raise the risk brought, for the reliability service of ac and dc systems is given security.The present invention is a kind of convenient and practical one-tower double-circuit DC transmission system underload powerless control method.
Accompanying drawing explanation
Fig. 1 is the structural representation of co-sited one-tower double-circuit DC transmission system;
Fig. 2 is the equivalent circuit diagram of single time DC transmission system in co-sited one-tower double-circuit DC transmission system;
Fig. 3 is maximum pass angle of rupture recommended value under direct current system underload;
Fig. 4 is the wide-angle serviceability of thyristor valve.
Embodiment
The present invention proposes a kind of one-tower double-circuit DC transmission system underload idle work optimization method, is described with reference to the accompanying drawings as follows:
Described one-tower double-circuit DC transmission system is co-sited one-tower double-circuit DC transmission system, include converter transformer, alternating current filter, converter valve, smoothing reactor, DC filter and DC line, twice totally 4 poles, every pole converter valve adopts 1 12 pulse conversion device, share alternating-current field, earth electrode and overhead line structures, according to high-voltage dc transmission electric theory, in co-sited one-tower double-circuit DC transmission system, the equivalent circuit of single time DC transmission system as shown in Figure 2.
Steady-state DC electric current can be tried to achieve according to Fig. 2:
In formula, I
dfor direct current; U
d0rand U
d0ibe respectively rectifier and inverter without controlled ideal no load direct voltage, α and β is respectively the delay angle of rectification side and inverter side, d
xrand d
xibe respectively the ratio phase change voltage drop of rectifier and inverter, R is DC line substitutional resistance.
Can find out, direct voltage and direct current all depend on α, β, U
d0rand U
d0ifour amounts, therefore above-mentioned four amounts are controlled quentity controlled variables of HVDC, and the basic controlling means of HVDC are exactly control above-mentioned four amounts with the various service requirements meeting DC transmission system.Wherein, α and β has the response speed be exceedingly fast, and U
d0rand U
d0iby regulating the tap of converter transformer to be regulated, but its response speed wants much slow compared with delay angle.Therefore generally, for the quick voltage change in AC system, HVDC maintains its performance by regulating delay angle, and for the slow change in voltage in AC system, HVDC makes Trigger Angle maintain near its rated value by regulating converter transformer tap, it is characterized in that one-tower double-circuit DC transmission system underload idle work optimization method comprises the steps:
Whole control method is divided into two parts by the present invention, namely fixes change of current variation joint gear, increases rectification side Trigger Angle and the inverter side pass angle of rupture.Concrete implementation step is as follows:
1) fixing change of current variation joint gear.The set point in advance direct current system being operated in change of current shift position during underload is input in the control logic of system, the gear of change of current variation joint is typically chosen in the centre position of change of current variation joint gear, be conducive to the transient recovery of AC system, be also conducive to the lifting of direct current transmission power.
2) rectification side Trigger Angle and the inverter side pass angle of rupture is increased.The set point of in advance rectification side Trigger Angle and inverter side being closed the angle of rupture is input in the control logic of system, different direct current transmission powers sets different inverter side and closes the angle of rupture, the reactive power consumption amount of converter valve is regulated, to reach the object of reactive balance in current conversion station according to the idle situation of current conversion station.Rectification side Trigger Angle and the inverter side set point of closing the angle of rupture by direct current system produce harmonic content number, the power decision carried of direct current system, and be subject to the restriction (as shown in Figure 1) of the wide-angle serviceability of thyristor valve, should avoid causing due to the increase of Trigger Angle/pass angle of rupture inverter side bank of filters too much to throw because of harmonic content more, cause more how idle remaining phenomenon.The recommended value of the inverter side maximum pass angle of rupture as shown in Figure 2.
Claims (5)
1. an one-tower double-circuit DC transmission system underload idle work optimization method, described one-tower double-circuit DC transmission system includes converter transformer, alternating current filter, converter valve, smoothing reactor, DC filter and DC line, twice totally 4 poles, every pole converter valve adopts 1 12 pulse conversion device, share alternating-current field, earth electrode and overhead line structures, according to high-voltage dc transmission electric theory, in one-tower double-circuit DC transmission system single time DC transmission system equivalent circuit in, steady-state DC electric current:
In formula, I
dfor direct current; U
d0rand U
d0ibe respectively rectifier and inverter without controlled ideal no load direct voltage, α and β is respectively the delay angle of rectification side and inverter side, d
xrand d
xibe respectively the ratio phase change voltage drop of rectifier and inverter, R is DC line substitutional resistance,
Found out by above formula, direct voltage and direct current all depend on α, β, U
d0rand U
d0ifour amounts, therefore above-mentioned four amounts are controlled quentity controlled variables of HVDC, and the basic controlling means of HVDC are exactly control above-mentioned four amounts with the various service requirements meeting DC transmission system, and wherein, α and β has the response speed be exceedingly fast, and U
d0rand U
d0iregulated by regulating the tap of converter transformer, but its response speed wants much slow compared with delay angle, therefore generally, for the quick voltage change in AC system, HVDC maintains its performance by regulating delay angle, and for the slow change in voltage in AC system, HVDC makes Trigger Angle maintain near its rated value by regulating converter transformer tap, it is characterized in that one-tower double-circuit DC transmission system underload idle work optimization method comprises the steps:
1) fixing change of current variation joint gear;
2) rectification side Trigger Angle and the inverter side pass angle of rupture is increased.
2. one-tower double-circuit DC transmission system underload idle work optimization method according to claim 1, it is characterized in that common-tower double-return direct current system is run under low load condition, the direct current power of DC transmission system conveying is less than 0.2p.u., now, DC transmission system is subject to the effect of absolute minimum filters switching logic, minimum filters group must be dropped into, thus may cause occurring a large amount of idle residue in current conversion station.
3. one-tower double-circuit DC transmission system underload idle work optimization method according to claim 1, it is characterized in that above-mentioned steps 1) fixing rectification side Trigger Angle and inverter side be when closing the angle of rupture, regulates the impact of change of current variation joint gear on current conversion station reactive balance to ignore.
4. one-tower double-circuit DC transmission system underload idle work optimization method according to claim 1, is characterized in that above-mentioned steps 1) set point of change of current shift position is input in the control logic of system when in advance direct current system being operated in underload.
5. one-tower double-circuit DC transmission system underload idle work optimization method according to claim 1, it is characterized in that above-mentioned steps 2) in advance the set point of rectification side Trigger Angle during direct current underrun and the inverter side pass angle of rupture is input in the control logic of system, different direct current transmission powers sets different inverter side and closes the angle of rupture, by the object regulating the reactive power consumption amount on converter to reach reactive balance in current conversion station.
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Cited By (8)
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| CN106130055A (en) * | 2016-06-30 | 2016-11-16 | Abb瑞士股份有限公司 | The lever variable-power control system of HVDC transmission system and method thereof |
| CN107017654A (en) * | 2017-05-31 | 2017-08-04 | 国网四川省电力公司电力科学研究院 | A kind of extra-high voltage direct-current transmission control device for suppressing exchange temporary overvoltage |
| CN108599181A (en) * | 2018-04-09 | 2018-09-28 | 华南理工大学 | It is a kind of based on the power distribution network DG inverter powerless control methods locally measured |
| CN110601165A (en) * | 2019-09-10 | 2019-12-20 | 中国电力工程顾问集团中南电力设计院有限公司 | DC line reconstructed by same-tower double-circuit AC line and reconstruction method thereof |
| CN110676857A (en) * | 2019-10-28 | 2020-01-10 | 南方电网科学研究院有限责任公司 | Reactive compensation method, device and equipment |
| CN111404188A (en) * | 2020-02-19 | 2020-07-10 | 李云亭 | Direct-current power control method for fixing transformation ratio of converter |
| CN111478355A (en) * | 2020-04-14 | 2020-07-31 | 南京南瑞继保电气有限公司 | QPC control method for back-to-back direct current power transmission system |
| US20220397615A1 (en) * | 2020-01-21 | 2022-12-15 | South China University Of Technology | Dc converter valve state detection method based on temporal features of converter terminal currents |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130055A (en) * | 2016-06-30 | 2016-11-16 | Abb瑞士股份有限公司 | The lever variable-power control system of HVDC transmission system and method thereof |
| CN107017654B (en) * | 2017-05-31 | 2023-08-01 | 国网四川省电力公司电力科学研究院 | Extra-high voltage direct current transmission control device for inhibiting alternating current temporary overvoltage |
| CN107017654A (en) * | 2017-05-31 | 2017-08-04 | 国网四川省电力公司电力科学研究院 | A kind of extra-high voltage direct-current transmission control device for suppressing exchange temporary overvoltage |
| CN108599181A (en) * | 2018-04-09 | 2018-09-28 | 华南理工大学 | It is a kind of based on the power distribution network DG inverter powerless control methods locally measured |
| CN108599181B (en) * | 2018-04-09 | 2021-09-21 | 华南理工大学 | Power distribution network DG inverter reactive power control method based on local measurement |
| CN110601165A (en) * | 2019-09-10 | 2019-12-20 | 中国电力工程顾问集团中南电力设计院有限公司 | DC line reconstructed by same-tower double-circuit AC line and reconstruction method thereof |
| CN110676857A (en) * | 2019-10-28 | 2020-01-10 | 南方电网科学研究院有限责任公司 | Reactive compensation method, device and equipment |
| CN110676857B (en) * | 2019-10-28 | 2021-05-14 | 南方电网科学研究院有限责任公司 | Reactive compensation method, device and equipment |
| US11959976B2 (en) * | 2020-01-21 | 2024-04-16 | South China University Of Technology | DC converter valve state detection method based on temporal features of converter terminal currents |
| US20220397615A1 (en) * | 2020-01-21 | 2022-12-15 | South China University Of Technology | Dc converter valve state detection method based on temporal features of converter terminal currents |
| CN111404188A (en) * | 2020-02-19 | 2020-07-10 | 李云亭 | Direct-current power control method for fixing transformation ratio of converter |
| CN111478355A (en) * | 2020-04-14 | 2020-07-31 | 南京南瑞继保电气有限公司 | QPC control method for back-to-back direct current power transmission system |
| CN111478355B (en) * | 2020-04-14 | 2022-07-22 | 南京南瑞继保电气有限公司 | QPC control method for back-to-back direct current transmission system |
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