CN103618331A - Direct-current overvoltage current limiting control method of flexible HVDC convertor station - Google Patents

Direct-current overvoltage current limiting control method of flexible HVDC convertor station Download PDF

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CN103618331A
CN103618331A CN201310609347.1A CN201310609347A CN103618331A CN 103618331 A CN103618331 A CN 103618331A CN 201310609347 A CN201310609347 A CN 201310609347A CN 103618331 A CN103618331 A CN 103618331A
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overvoltage
scada
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CN103618331B (en
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袁志昌
赵晓斌
刘鸿年
李岩
黎小林
刘涛
李笑倩
罗雨
王力光
杨文博
黄莹
卢毓欣
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ZHANGJIAGANG SMARTGRID RESEARCH INSTITUTE
Tsinghua University
CSG Electric Power Research Institute
Research Institute of Southern Power Grid Co Ltd
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ZHANGJIAGANG SMARTGRID RESEARCH INSTITUTE
Tsinghua University
Research Institute of Southern Power Grid Co Ltd
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Abstract

The invention provides a direct-current overvoltage current limiting control method of a flexible HVDC convertor station. The method can solve the problems that when alternating-current side grid faults of a flexible HVDC system receiving end convertor station or direct-current monopole disconnection faults of a sending end convertor station happen, power output of the sending end convertor station is limited so that direct-current bus overvoltage is caused, and when the voltage exceeds a protection setting value, a flexible HVDC system is locked and shut down, and the method can be used for quickly lowering the absorbed active power value of the sending end convertor station from an alternating-current power grid and restraining direct-current circuit voltage rise. When the method is applied to flexible HVDC system control, and power grid faults cause the problems that the convertor station power transmitting capacity is limited and direct-current voltage quickly rises, the absorbed active power of the sending end convertor station from the alternating-current power grid is lowered, direct-current voltage rise is restrained, and the problem that the flexible HVDC system is locked and shut down due to the fact that the voltage exceeds the protection setting value is avoided.

Description

A kind of flexible DC power transmission current conversion station direct current overvoltage Current limited Control method
 
Technical field
The invention belongs to the network stability control technical field of electric power system, particularly a kind of flexible DC power transmission current conversion station direct current overvoltage Current limited Control method.
background technology
When the AC electrical network of current conversion station or DC side list loop line break down while causing voltage to fall; DC side active power of output reduces; energy can constantly be stored on the capacitor being connected in parallel between DC bus; cause DC bus-bar voltage rising and ac-side current excessive; if processed not in time; will trigger converter control protection action, the whole current conversion station of stopping transport, even whole flexible DC power transmission system.There is so following shortcoming: the stoppage in transit probability that 1) has increased flexible DC power transmission system; 2) if operation current conversion station or operational system are connected with important load, the current conversion station of stopping transport will cause heavy losses; 3) if two asynchronous electrical networks pass through flexible DC power transmission systems connection, stop transport after current conversion station and can cause two asynchronous grid disconnections, the stable control protection of electrical network action, loses part power supply or load, even cause cascading failure, cause synchronised grids paralysis; 4) if stoppage in transit current conversion station may cause its alternating current circuit in parallel overload, even Line Flow surpasses its temporarily steady limit, causes the stable control protection of electrical network action; 5) current conversion station even whole system restart complexity.So fast reducing sending end current conversion station is sent active power, reducing direct voltage is research emphasis with trigger protection action not, and the present invention proposes the control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting in order to realize this purpose.
Summary of the invention
The object of the invention is to propose a kind of control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting; the present invention takes into account the protection requirement of electric power system to flexible direct current system ability to transmit electricity and DC line; according to the DC line generating positive and negative voltage of real-time measurement, calculate voltage across poles; when voltage across poles surpasses setting value; the active power value absorbing from AC system by fast reducing sending end current conversion station, realizes the control target that prevents DC line overvoltage.
Technical scheme of the present invention is: the control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting of the present invention, comprises the steps:
1), when a control cycle arrives, measure in real time DC line generating positive and negative voltage and calculate voltage across poles U; And voltage is marked to change and process, voltage across poles is defined as to voltage base value U base, the voltage measuring value U that mark is changed dc=U/U base;
2) integrated voltage measured value U dc, voltage setting value U set, current meritorious reference value P refand the concrete condition of the enable command EN_OVCL_SCADA of SCADA, calculate the meritorious variation delta P of target control ref,
Condition one: EN_OVCL_SCADA is 0, and SCADA end forces not carry out overvoltage Current limited Control, meritorious variation delta P refbe 0, wherein EN_OVCL_SCADA is the current limiting enabled instruction of overvoltage that SCADA sends;
Condition two: EN_OVCL_SCADA is 1, and SCADA end carries out overvoltage current limliting, current meritorious reference value P ref>0, represents that DC line carries active power to current conversion station, does not now need to carry out overvoltage Current limited Control, meritorious variation delta P refbe 0; Condition three: EN_OVCL_SCADA is 1, and SCADA end carries out overvoltage current limliting, current meritorious reference value P ref≤ 0, represent that current conversion station carries active power to DC line, and EN_OVCLCTRL controls at 1 o'clock by triggering overvoltage is current limiting enabled, work as P ref≤ 0, direct voltage U dcthe high threshold that surpasses hysteresis loop comparator, EN_OVCLCYRL=1, starts overvoltage Current limited Control, reduces to the low threshold value of hysteresis loop comparator by PI feedback regulation control direct current power, and EN_OVCLCYRL=0, exits overvoltage Current limited Control;
3) according to meritorious variation delta P refand the meritorious reference value P issuing from SCADA ref_SCADA, calculate the meritorious reference value P of target control ref
4) meritorious reference value P refbe sent to next stage and control, and wait for that next control cycle goes to step 1 while arriving).
Described step 2) specifically comprise the following steps:
(2.1) calculating voltage measured value U dcand voltage setting value U setdifference DELTA U, Δ U=U dc-U set, U wherein setgenerally be made as rated value 1.0 p.u.;
(2.2), according to the transfer function of Δ U and proportional integral, calculate voltage-controlled preliminary controlled quentity controlled variable P u; The transfer function of proportional integral is: , wherein s is complex frequency, K pand T ibe respectively proportionality coefficient and integration time constant, choose K p=5, T i=0.05s;
(2.3) to P ucarry out amplitude limiting processing, calculate required meritorious variation delta P ref; The processing logic of amplitude limit is for working as P uduring >0, Δ P ref=0; Work as P u<-P maxtime, Δ P ref=-P max; When-P max<P uduring <0, Δ P ref=P u; The amplitude limit value P of amplitude limiting processing maxgenerally elect the rated capacity of active power as, P max=1.0p.u..
Described step 2) in, the high threshold of hysteresis loop comparator is made as 1.05p.u., and the low threshold value of hysteresis loop comparator is made as 0.94p.u..
The present invention takes into account the protection requirement of electric power system to flexible direct current system ability to transmit electricity and DC line; according to the DC line generating positive and negative voltage of real-time measurement, calculate voltage across poles; when voltage across poles surpasses setting value; the active power value absorbing from AC system by fast reducing sending end current conversion station, realizes the control target that prevents DC line overvoltage.
Control method of the present invention is positioned at system-level key-course in whole flexible DC power transmission control system, its major function is according to the situation of change of line voltage distribution, active power, the active power of the required reduction of dynamic calculation sending end current conversion station, to suppress DC voltage rising and overvoltage.The inventive method is the improvement to existing system stage control method, therefore can not need to increase specially hardware and realize.Can on original flexible direct current control system hardware platform, by change control program, realize, make flexible DC power transmission system control the control that simultaneously realizes active power and direct voltage.
The invention has the beneficial effects as follows: electric network fault causes that current conversion station ability to transmit electricity is limited, during direct voltage fast rise; the active power absorbing from AC network by reducing sending end current conversion station; suppress DC voltage rising, prevent from causing the locking of flexible direct current system and stoppage in transit because surpassing protection definite value.The method has the features such as physical significance is distinct, realization is simple, excellent performance, the related control method of the present invention can be applicable in the current conversion station level and system-level controller of flexible DC power transmission system, strengthens current conversion station and the overvoltage control ability of system-level controller to direct voltage.The present invention is the active power that a kind of fast reducing sending end current conversion station absorbs from AC network, avoids the control method of direct current overvoltage, and the method has the features such as physical significance is distinct, realization is simple, excellent performance.
Accompanying drawing explanation
Fig. 1 is the control block diagram of overvoltage current limiting control apparatus of the present invention;
Fig. 2 is that overvoltage current limliting of the present invention is from judging enabled device logic control block diagram.
Embodiment
When flexible DC power transmission system receiving end current conversion station AC electric network fault or sending end current conversion station direct current one pole disconnection fault; sending end current conversion station power is sent the limited DC bus overvoltage that causes; when surpassing protection setting value, locking and the stoppage in transit of flexible DC power transmission system will be caused.In order to improve flexible DC power transmission system operation reliability; reduce stoppage in transit probability; the control method of a kind of flexible DC power transmission system sending end current conversion station overvoltage current limliting that the present invention proposes; the present invention takes into account the protection requirement of electric power system to flexible direct current system ability to transmit electricity and DC line; according to the DC line generating positive and negative voltage of real-time measurement, calculate voltage across poles; when voltage across poles surpasses setting value; the active power value absorbing from AC system by fast reducing sending end current conversion station, realizes the control target that prevents DC line overvoltage.
Flexible DC power transmission system sending end current conversion station overvoltage current limiting control apparatus as shown in Figure 1, comprise DC voltage measurement, do poor calculating with voltage setting value, overvoltage current limliting is from judging enabled device (EN_OVERCTRL), pi regulator, SCADA overvoltage current limliting instruction (EN_OVCL_SCADA) and corresponding amplitude limit link etc.
The control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting comprises the following steps:
1), when a control cycle arrives, measure in real time DC line generating positive and negative voltage and calculate voltage across poles U; And voltage is marked to change and process, using voltage across poles grade as voltage base value Ubase, the voltage measuring value Udc=U/Ubase that mark is changed;
2) integrated voltage measured value U dc, voltage setting value U set, current meritorious reference value P refand the concrete condition of the enable command EN_OVCL_SCADA of SCADA, calculate the meritorious variation delta P of target control ref,
Condition one: EN_OVCL_SCADA is 0, and SCADA end forces not carry out overvoltage Current limited Control, meritorious variation delta P refbe 0;
Condition two: EN_OVCL_SCADA is 1, and SCADA end carries out overvoltage current limliting, current meritorious reference value P ref>0, represents that DC line carries active power to current conversion station, but does not now need to carry out the meritorious variation delta P of overvoltage current limliting refbe 0;
Condition three: EN_OVCL_SCADA is 1, and SCADA end carries out overvoltage current limliting, current meritorious reference value P ref≤ 0, represent that current conversion station carries active power to DC line, and EN_OVCLCTRL will control to overvoltage is current limiting enabled at 1 o'clock, as shown in Figure 2, work as P ref≤ 0, direct voltage U dcthe high threshold that surpasses hysteresis loop comparator, in the present embodiment, high threshold is made as 1.05p.u., EN_OVCLCYRL=1, starts overvoltage Current limited Control, reduces to the low threshold value of hysteresis loop comparator by PI feedback regulation control direct current power, in the present embodiment, low threshold value is made as 0.94p.u., and EN_OVCLCYRL=0 exits overvoltage Current limited Control.Concrete operation step is as follows:
(2.1) calculating voltage measured value U dcand voltage setting value U setdifference DELTA U, Δ U=U dc-U set, U wherein setgenerally be made as rated value 1.0 p.u.;
(2.2), according to the transfer function of Δ U and proportional integral, calculate voltage-controlled preliminary controlled quentity controlled variable P u; The transfer function of proportional integral is:
Figure 459652DEST_PATH_IMAGE002
, wherein s is complex frequency, K pand T ibe respectively proportionality coefficient and integration time constant, can choose K p=5, T i=0.05s;
(2.3) to P ucarry out amplitude limiting processing, calculate required meritorious variation delta P ref; The processing logic of amplitude limit is for working as P uduring >0, Δ P ref=0; Work as P u<-P maxtime, Δ P ref=-P max; When-P max<P uduring <0, Δ P ref=P u; The amplitude limit value P of amplitude limiting processing maxgenerally elect the rated capacity of active power as, P max=1.0 p.u.;
3) according to meritorious variation delta P refand the meritorious reference value P issuing from SCADA ref_SCADA, calculate the meritorious reference value P of target control refgenerally there is P ref=P ref_SCADA+ Δ P ref;
4) meritorious reference value P refbe sent to next stage and control, and wait for that next control cycle goes to step 1 while arriving).
So far, the overvoltage Current limited Control control task that the present invention proposes all completes.

Claims (4)

1. a control method for flexible DC power transmission system sending end current conversion station overvoltage current limliting, is characterized in that comprising the steps:
1), when a control cycle arrives, measure in real time DC line generating positive and negative voltage and calculate voltage across poles U; And voltage is marked to change and process, voltage across poles is defined as to voltage base value U base, the voltage measuring value U that mark is changed dc=U/U base;
2) integrated voltage measured value U dc, voltage setting value U set, current meritorious reference value P refand the concrete condition of the enable command EN_OVCL_SCADA of SCADA, calculate the meritorious variation delta P of target control ref,
Condition one: EN_OVCL_SCADA is 0, and SCADA end forces not carry out overvoltage Current limited Control, meritorious variation delta P refbe 0, wherein EN_OVCL_SCADA is the current limiting enabled instruction of overvoltage that SCADA sends;
Condition two: EN_OVCL_SCADA is 1, and SCADA end carries out overvoltage current limliting, current meritorious reference value P ref>0, represents that DC line carries active power to current conversion station, does not now need to carry out overvoltage Current limited Control, meritorious variation delta P refbe 0; Condition three: EN_OVCL_SCADA is 1, and SCADA end carries out overvoltage current limliting, current meritorious reference value P ref≤ 0, represent that current conversion station carries active power to DC line, and EN_OVCLCTRL controls at 1 o'clock by triggering overvoltage is current limiting enabled, work as P ref≤ 0, direct voltage U dcthe high threshold that surpasses hysteresis loop comparator, EN_OVCLCYRL=1, starts overvoltage Current limited Control, reduces to the low threshold value of hysteresis loop comparator by PI feedback regulation control direct current power, and EN_OVCLCYRL=0, exits overvoltage Current limited Control;
3) according to meritorious variation delta P refand the meritorious reference value P issuing from SCADA ref_SCADA, calculate the meritorious reference value P of target control ref
4) meritorious reference value P refbe sent to next stage and control, and wait for that next control cycle goes to step 1 while arriving).
2. the control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting according to claim 1, is characterized in that described step 2) specifically comprise the following steps:
(2.1) calculating voltage measured value U dcand voltage setting value U setdifference DELTA U, Δ U=U dc-U set, U wherein setgenerally be made as rated value 1.0 p.u.;
(2.2), according to the transfer function of Δ U and proportional integral, calculate voltage-controlled preliminary controlled quentity controlled variable P u; The transfer function of proportional integral is: eqn6349
Figure 2013106093471100001DEST_PATH_IMAGE001
, wherein s is complex frequency, K pand T ibe respectively proportionality coefficient and integration time constant, choose K p=5, T i=0.05s;
(2.3) to P ucarry out amplitude limiting processing, calculate required meritorious variation delta P ref; The processing logic of amplitude limit is for working as P uduring >0, Δ P ref=0; Work as P u<-P maxtime, Δ P ref=-P max; When-P max<P uduring <0, Δ P ref=P u; The amplitude limit value P of amplitude limiting processing maxgenerally elect the rated capacity of active power as, P max=1.0p.u..
3. the control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting according to claim 1, is characterized in that described step 2) in the high threshold of hysteresis loop comparator be made as 1.05p.u., the low threshold value of hysteresis loop comparator is made as 0.94p.u..
4. the control method of flexible DC power transmission system sending end current conversion station overvoltage current limliting according to claim 1; it is characterized in that taking into account the protection requirement of electric power system to flexible direct current system ability to transmit electricity and DC line; according to the DC line generating positive and negative voltage of real-time measurement, calculate voltage across poles; when voltage across poles surpasses setting value; the active power value absorbing from AC system by fast reducing sending end current conversion station, realizes the control target that prevents DC line overvoltage.
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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
CN107732892A (en) * 2017-11-13 2018-02-23 国网四川省电力公司电力科学研究院 A kind of optimal suppressing method of overvoltage based on the idle control of D.C. high voltage transmission
CN107846004A (en) * 2017-09-30 2018-03-27 全球能源互联网研究院有限公司 Inrush current and transformer excitation flow synthesis suppressing method and realization device
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CN109888813A (en) * 2019-03-04 2019-06-14 国家电网有限公司 A kind of more power sources comprising VSC-HVDC send out channel ability to transmit electricity and maximally utilize method
CN111276997A (en) * 2020-04-13 2020-06-12 国网福建省电力有限公司 Alternating current fault current limiting method for flexible direct current transmission system
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CN112217221A (en) * 2020-10-12 2021-01-12 国网福建省电力有限公司 Manual emergency shutdown control method for double-end flexible direct-current transmission converter station
CN112421591A (en) * 2020-09-29 2021-02-26 国网福建省电力有限公司电力科学研究院 Low-voltage current-limiting fixed value adjusting method for restraining flexible direct current near-zone three-phase short-circuit current
CN113937806A (en) * 2020-09-17 2022-01-14 华北电力大学（保定） Method for inhibiting overvoltage of wind-light water at sending end of direct current delivery system

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