CN103094905B - Selection method of dynamic reactive power compensation configuration point - Google Patents
Selection method of dynamic reactive power compensation configuration point Download PDFInfo
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Abstract
The invention provides a method that the system strength and the degree of impact on a system due to a fault are measured through the direct current multi-infeed short circuit ratio after the direct current receiving end grid is failed and a dynamic reactive power compensation configuration point can be ensured, namely, a selection method of the dynamic reactive power compensation configuration point. The selection method of the dynamic reactive power compensation configuration point comprises the following steps: building a mold; ensuring a contact line of a direct current receiving system, a direct current receiving inverter station and an alternating current system and enumerating and predicating system status collection after fault; calculating the direct current multi-infeed short circuit ratio; predicating the weak point of voltage stability; conducting simulation verification. When the result of the simulation verification is the weak point of the voltage stability, a dynamic reactive power compensation device is configured. By means of consideration of the state of the system after the fault and the influence of the fault on the system, the selection method of the dynamic reactive power compensation configuration point compensates the influence of the multi-infeed short circuit which is used as an index obtained through a static calculation on the fault transient state procedure and on the system and overcomes the defect that consideration of the status of the system after the fault is not enough, and the calculation is simple and convenient.
Description
Technical field
The invention belongs to analysis and the calculating field of power system, be specifically related to a kind of system of selection of the dynamic reactive power compensation configuration point based on direct current many feed-ins short-circuit ratio.
Background technology
D.C. high voltage transmission and AC network interconnected, the interaction between ac and dc systems and impact will be formed.If AC network intensity is more weak, then can there is the series of problems such as Voltage Instability Transient Instability, dynamic overvoltage and harmonic instability.Interactional size between AC system and straight-flow system, and the order of severity to electric network influencing, depend on to a great extent AC system with connect the relative size of straight-flow system capacity.The power of AC network can reflect that in system, element is to the susceptibility of various disturbance.Strong AC system does not have significant voltage or the change of merit angle to load variations disturbance, but for weak AC system, individual little disturbance just likely can cause larger voltage or the skew of other electric parameters.
The capacity of short circuit at DC converter station bus place or equivalent impedance are normally in the better index of this some measurement system power.In practical application, usual employing direct-current short circuit ratio (Short Curccut Ratioo, SCR) or effectively short-circuit ratio (EffcttveeShort Curcuit Ratio, ESCR) come quantitative assessment current conversion station connect the intensity of AC network, SCR and ECRR can be the optimum choice of power network planning scheme and power system operating mode reasonable arrangement provides reference.
For single feed-in straight-flow system, as shown in Figure 1, the definition of SCR and ESCR is wherein as follows respectively, S in formula for its system model
ac, P
dN, Q
cbe respectively change of current bus three-phase shortcircuit capacity, the specified power transmission power of direct current, current conversion station reactive compensation capacity.
In the calculating of effective short-circuit ratio, eliminate the capacitive charge power impact of reactive power compensator, its numerical value usually can objective appraisal AC network intensity more.The criteria for classifying according to effective short-circuit ratio quantitative assessment AC system power is:
1, ESCR>3, AC system is strong;
2,2<ESCR<3, AC system is weak;
3, ESCR<2, AC system is extremely weak.
Concentrate drop point in the system of same interchange receiving end electrical network for multiple-circuit line, adopt single feed-in direct-current short circuit than computing formula, cannot take into account influencing each other and effect between each time direct current, the result obtained is often relatively optimistic.Concentrate feedthrough system for many direct currents, its system model as shown in Figure 2, is a kind ofly taken into account each time direct current and to be influenced each other and the AC network intensity evaluation index many feed-ins short-circuit ratio (MSCR) that acts on is defined as follows:
In formula, P
di, Z
sibe respectively the operate power of i-th time DC line and the self-impedance of change of current bus; Z
iifor the mutual impedance between DC line i and j change of current bus.
Adopt MSCR quantitative target to evaluate AC system strong and weak, its criteria for classifying is consistent with ESCR, that is: the standard according to many direct currents effective short-circuit ratio evaluation AC system power is:
1, MSCR>3, AC system is strong;
2,2<MSCR<3, AC system is weak;
3, MSCR<2, AC system is extremely weak.
As shown in Figure 3, to the circuit diagram of static reacance generator STATCOM its operation principle obtain voltage from three phase network to charge to a DC capacitor, then DC voltage is reverse into alternating voltage sends electrical network back to.
If the voltage produced is greater than system voltage, the electric current leading voltage so transformer flow through 90 °, makes condensive load on electrical network band, and STATCOM supply is in other words idle; If the voltage produced is less than system voltage, flows through the current lagging voltage 90 ° of transformer, make STATCOM become inductive load, STATCOM absorbs idle in other words.Like this, if regulate the voltage of generator just can obtain the idle output be suitable on demand, and STATCOM can between perception and capacitive quick continuous setup.With phasor relation, above-mentioned principle can be described after simplifying (omitting harmonic wave).
The DC bus capacitor of reacance generator only provides DC voltage, and its voltage side is obtained by three-phase 6 diode chargings.Therefore, when system voltage declines, still specified reactive current can be confessed.And the equipment of other static compensator class, its electric current exported and voltage are proportional reductions.In principle, reacance generator has the effect supporting voltage better in fault.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of system of selection of the dynamic reactive power compensation configuration point based on direct current many feed-ins short-circuit ratio, solves the problem of line voltage shakiness.
The system of selection of a kind of dynamic reactive power compensation configuration point provided by the invention, its improvements are, described method comprises the steps:
(1) modeling;
(2) determine the interconnector of direct current receiving-end system, direct current receiving end Inverter Station and AC system, and enumerate the system mode set omega after prediction fault;
(3) direct current many feed-ins short-circuit ratio is calculated;
(4) weak spot is stablized according to short-circuit ratio predicted voltage;
(5) realistically displayed is carried out, if result determines that being is voltage stabilization weak spot, then configure dynamic reactive compensation device to the voltage stabilization weak spot of prediction.
Wherein, step (1) modeling comprises: each electric pressure line connection, line parameter circuit value, electric pressure transformer station and line connection, bus arrangement, main transformer capacity and parameter, static passive compensation device capacity and parameter, dynamic passive compensation place capacity and parameter, generator and control system model thereof and parameter, load model and power load distributing, DC transmission system model and parameter, FACTS device model and parameter.
Wherein, the fault that step (2) is predicted comprises prediction can there is alternating current circuit N-1 or N-2 fault.
Wherein, according to the element in system mode set omega in the topological structure determining step (2) of straight-flow system.
Wherein, step (3) described calculating direct current many feed-ins short-circuit ratio comprises:
1) under electrical network normal operating condition, many feed-ins short-circuit ratio of each direct current receiving-end system is calculated;
2) from the system mode set omega after the prediction fault enumerated, choose element wherein one by one, calculate many feed-ins short-circuit ratio of each direct current receiving-end system.
Wherein, when there is following situation in step (4), the voltage stabilization weak spot of direct current receiving-end system is predicted as:
1., under electrical network normal operating condition, many feed-ins short-circuit ratio is less than 3;
2., under near region, DC inversion station circuit N-1 or N-2 fault state out of service, many feed-ins short-circuit ratio is less than 3; Or
3., under near region, DC inversion station circuit N-1 or N-2 fault state out of service, compared with under electrical network normal operating condition, many feed-ins short-circuit ratio decrease beyond 40%.
Near region of the present invention circuit refers to: to stand erectly the circuit connecing and be connected or the circuit that the transformer station adjacent with DC inversion station is directly connected with DC inversion.(lower same)
Wherein, when step (5) carries out realistically displayed, verification fault type is selected as follows:
The all interconnector N-1 of A, DC inversion station and AC system and N-2 fault;
B, the direct current receiving-end system near region alternating current circuit N-1 or the N-2 fault that cause many feed-ins short-circuit ratio under malfunction to be less than 3; With
C, cause compared with under electrical network normal operating condition, alternating current circuit N-1 or N-2 fault near the direct current receiving-end system that many feed-ins short-circuit ratio decrease beyond 40%.
Wherein, step (5) comprises the step that the voltage stabilization weak spot predicted carries out realistically displayed:
I, selection fault type, system cloud gray model;
II, set a certain moment and break down;
The circuit of III, this fault of excision generation;
IV, judge whether system can recover normal operating condition, if can not normal operating condition be returned to, be then defined as voltage stabilization weak spot.
Wherein, after step (5) configuration dynamic reactive compensation device, carry out fault simulation calculating, can checking reactive compensation capacity, meet the requirement of power system restoration normal condition.
Wherein, after described fault simulation calculating refers to and the capacity of dynamic reactive compensation device is joined voltage stabilization weak spot, occur that the fault of unstability situation carries out realistically displayed again to voltage stabilization weak spot, whether checking stablizes.
Compared with prior art, beneficial effect of the present invention is:
The present invention is by considering that the state after the system failure and fault are to the influence of system, compensate for many feed-ins short-circuit ratio not enough on the consideration of fault transient process on the impact of system and the change of post-fault system state as the index obtained by static calculation, calculate simple and efficient, and by finding potential voltage stabilization weak spot to the simple analysis of result, the formulation work of dynamic reactive compensation device allocation plan can be instructed.
The present invention carries out omnibearing simulation by enumerating the system mode set after predicting fault to electrical network, can navigate to voltage stabilization weak spot fast, while hunting zone is wide, saves the time.
Accompanying drawing explanation
Fig. 1 is single infeed HVDC Systems model schematic;
Fig. 2 is Multi-infeed HVDC transmission system model schematic;
Fig. 3 is reacance generator STATCOM schematic diagram;
Fig. 4 is the flow chart of system of selection provided by the invention;
Fig. 5 is certain partial electric grid structural topology figure economized provided by the invention, and wherein STA1 ~ STA35 represents 500kV transformer station; RTS1 ~ RTS7 represents DC inversion station; PLANT1 ~ PLANT4 represents power plant.
Fig. 6 is part substation bus bar voltage curve near DCS4 during fault simulation provided by the invention calculates; Wherein inverted triangle represents the magnitude of voltage of STA34; Square represents the magnitude of voltage of STA35; The circular magnitude of voltage representing STA33; Horizontal axis representing time in figure, unit is second; The longitudinal axis represents the perunit value of voltage.
Fig. 7 is that during fault simulation provided by the invention calculates, DCS4 absorbs idle curve map from AC system.In figure, horizontal axis representing time, unit is second; The longitudinal axis represents reactive power, and unit is Mvar.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The system of selection of a kind of dynamic reactive power compensation configuration point based on direct current many feed-ins short-circuit ratio that the present embodiment provides, its flow chart as shown in Figure 4.Network system is economized for simulation example with certain, the many feed-ins short-circuit ratio calculated in the power system of this alternating current-direct current mixing receiving end under the different running status of each direct current is described, finds out system voltage stabilizes weak spot and finally determine that dynamic reactive mends the implementation method that device repays collocation point:
(1) the BPA simulation calculation data of this province's electrical network are set up;
Certain electric network composition topological diagram economized as shown in Figure 5, the content of modeling comprises: each electric pressure line connection, line parameter circuit value, each electric pressure transformer station and line connection, bus arrangement, main transformer capacity and parameter, static passive compensation device capacity and parameter, dynamic passive compensation place capacity and parameter, generator and control system model thereof and parameter, load model and power load distributing, DC transmission system model and parameter, FACTS device model and parameter.
(2) preparation is calculated;
Total straight-flow system 7 in this province's electrical network, called after DCS1 ~ DCS7 respectively, Inverter Station called after RTS1 ~ RTS7 respectively that each straight-flow system is corresponding, if the interconnector of first Inverter Station and AC system is called after LRTS11 ~ RTS1n respectively, the interconnector called after LRTS21 ~ RTS2n respectively of second Inverter Station and AC system, by that analogy, until 7 straight-flow systems are all named.
System mode set omega after prediction fault can be: LRTS11 off-state, LRTS12 off-state etc.The trouble point that the present embodiment has the greatest impact for direct current receiving-end system illustrates.
(3) the direct current many feed-ins short-circuit ratio under different conditions calculates;
Many feed-ins short-circuit ratio result of calculation under normal operating condition is as shown in table 1.
Table 1 normal operating condition direct current many feed-ins short-circuit ratio
| Straight-flow system | Transmission power (MW) | Many feed-ins short-circuit ratio (MSCR) |
| DCS1 | 1800(is bipolar) | 3.55 |
| DCS2 | 3000(is bipolar) | 5.56 |
| DCS3 | 3000(is bipolar) | 5.80 |
| DCS4 | 3000(is bipolar) | 7.63 |
| DCS5 | 5000(is bipolar) | 4.67 |
| DCS6 | 2500(one pole) | 8.07 |
| DCS7 | 3200(is bipolar) | 4.83 |
Part many feed-ins short-circuit ratio result of calculation under post-failure state is as shown in table 2.
Table 2 post-failure state direct current many feed-ins short-circuit ratio
(4) interpretation of result;
As can be seen from Table 1 under normal operating condition, many feed-ins short-circuit ratio is not had to be less than the straight-flow system of 3.
Table 2 lists the part many feed-ins short-circuit ratio result of calculation under post-failure state, under there is N-1 or N-2 post-failure state in alternating current circuit, many feed-ins short-circuit ratio is not had to be less than the straight-flow system of 3 yet, but DCS4 is after LRTS43 and LRTS44 two circuits generation N-2 faults are out of service, many feed-ins short-circuit ratio have dropped 53.2%, needs to carry out transient emulation calculation check to this fault.
(5) realistically displayed;
The step of the voltage stabilization weak spot of prediction being carried out to realistically displayed comprises:
I, selection fault type, system cloud gray model;
II, set a certain moment and break down;
The circuit of III, this fault of excision generation;
IV, judge whether system can recover normal operating condition, if can not normal operating condition be returned to, be then defined as voltage stabilization weak spot, if can normal operating condition be returned to, then judge that changing the time is not voltage stabilization weak spot.
N-2 fault is occurred to LRTS43 and LRTS44 two circuits and carries out analogue simulation, near DCS4, part substation bus bar voltage curve as shown in Figure 6, DCS4 absorbs idle curve map as shown in Figure 7 from AC system, after finding fault, DCS4 straight-flow system power cannot recover, continue to absorb idle from AC system, finally cause electrical network unstability.
Configure the STATCOM device of 2 pool-sizes ± 200Mvar at the Inverter Station RTS4 of DCS4 straight-flow system, the circuit diagram of its device as shown in Figure 3.
After configuration dynamic reactive compensation device, then carry out fault simulation calculating, can verification reactive compensation capacity meet and become voltage stabilization weak spot again normal point.To LRTS43 and LRTS44 two circuits, N-2 fault occurs and carry out simulation calculation, result is stablized, and illustrates that configuring dynamic reactive compensation device in this voltage stabilization weak spot of RTS4 has comparatively significantly effect.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a system of selection for dynamic reactive power compensation configuration point, is characterized in that, described method comprises the steps:
(1) modeling;
(2) determine the interconnector of direct current receiving-end system, direct current receiving end Inverter Station and AC system, and enumerate the system mode set omega after prediction fault;
(3) direct current many feed-ins short-circuit ratio is calculated;
(4) weak spot is stablized according to short-circuit ratio predicted voltage;
(5) realistically displayed is carried out, if result determines that being is voltage stabilization weak spot, then configure dynamic reactive compensation device to the voltage stabilization weak spot of prediction;
Step (1) modeling comprises: each electric pressure line connection, line parameter circuit value, electric pressure transformer station and line connection, bus arrangement, main transformer capacity and parameter, static passive compensation device capacity and parameter, dynamic passive compensation place capacity and parameter, generator and control system model thereof and parameter, load model and power load distributing, DC transmission system model and parameter, FACTS device model and parameter;
When there is following situation in step (4), be predicted as the voltage stabilization weak spot of direct current receiving-end system:
1., under electrical network normal operating condition, many feed-ins short-circuit ratio is less than 3;
2., under near region, DC inversion station circuit N-1 or N-2 fault state out of service, many feed-ins short-circuit ratio is less than 3; Or
3., under near region, DC inversion station circuit N-1 or N-2 fault state out of service, compared with under electrical network normal operating condition, many feed-ins short-circuit ratio decrease beyond 40%;
The step that the voltage stabilization weak spot of step (5) to prediction carries out realistically displayed comprises:
I, selection fault type, system cloud gray model;
II, set a certain moment and break down;
The circuit of III, this fault of excision generation;
IV, judge whether system can recover normal operating condition, if can not normal operating condition be returned to, be then defined as voltage stabilization weak spot.
2. system of selection as claimed in claim 1, it is characterized in that, the fault that step (2) is predicted comprises prediction can there is alternating current circuit N-1 or N-2 fault.
3. system of selection as claimed in claim 1, is characterized in that, according to the element in system mode set omega in the topological structure determining step (2) of straight-flow system.
4. system of selection as claimed in claim 1, it is characterized in that, step (3) described calculating direct current many feed-ins short-circuit ratio comprises:
1) under electrical network normal operating condition, many feed-ins short-circuit ratio of each direct current receiving-end system is calculated;
2) from the system mode set omega after the prediction fault enumerated, choose element wherein one by one, calculate many feed-ins short-circuit ratio of each direct current receiving-end system.
5. system of selection as claimed in claim 1, is characterized in that, when step (5) carries out realistically displayed, verification fault type is selected as follows:
The all interconnector N-1 of A, DC inversion station and AC system and N-2 fault;
B, the direct current receiving-end system near region alternating current circuit N-1 or the N-2 fault that cause many feed-ins short-circuit ratio under malfunction to be less than 3; With
C, cause compared with under electrical network normal operating condition, alternating current circuit N-1 or N-2 fault near the direct current receiving-end system that many feed-ins short-circuit ratio decrease beyond 40%.
6. system of selection as claimed in claim 1, is characterized in that, after step (5) configuration dynamic reactive compensation device, carries out fault simulation calculating, checking reactive compensation capacity.
7. system of selection as claimed in claim 6, it is characterized in that, after described fault simulation calculating refers to and the capacity of dynamic reactive compensation device is joined voltage stabilization weak spot, occur that the fault of unstability situation carries out realistically displayed again to voltage stabilization weak spot, whether checking stablizes.
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| CN103427427B (en) * | 2013-05-31 | 2015-05-27 | 国家电网公司 | Power grid source steady state voltage regulating optimization method for improving transient voltage support capability of power grid |
| CN103580022B (en) * | 2013-11-05 | 2015-08-05 | 国家电网公司 | A kind of electrical power system dynamic reactive storage computational methods |
| CN103887810B (en) * | 2014-03-12 | 2016-08-24 | 国家电网公司 | Straight-flow system based on short-circuit ratio dynamic tracking continues phase conversion failure judgment method |
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| CN105071447B (en) * | 2015-09-09 | 2017-05-03 | 浙江大学 | Alternating current/direct-current hybrid connection multi-infeed direct-current receiving end power grid strength obtaining method |
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| CN106451432B (en) * | 2016-10-25 | 2018-12-25 | 国网江苏省电力公司电力科学研究院 | Coordination recovery control method after the multi-infeed DC system failure |
| CN106845752A (en) * | 2016-11-08 | 2017-06-13 | 国家电网公司 | A kind of extensive extra-high voltage interconnected network receives electric Scale Evaluation system |
| CN107134799A (en) * | 2017-04-19 | 2017-09-05 | 国家电网公司 | A kind of extra-high voltage grid transverter reactive configuration method based on short-circuit ratio |
| CN109378830B (en) * | 2018-12-03 | 2022-05-03 | 哈尔滨理工大学 | Synchronous phase modulator site selection method based on long-distance power transmission |
| CN109802419B (en) * | 2019-01-17 | 2021-05-04 | 广东电网有限责任公司 | Transient overvoltage evaluation and calculation method for receiving-end power grid of multi-direct-current feed-in system |
| CN111030127B (en) * | 2019-11-21 | 2022-07-01 | 中国电力科学研究院有限公司 | Method and system for determining dynamic and static reactive power coordination control strategy of multi-direct-current feed-in system |
| CN111446722A (en) * | 2020-03-20 | 2020-07-24 | 国网浙江省电力有限公司温州供电公司 | Measurement method for optimal placement of STATCOMS in multi-feed power electronic system |
| CN113852142B (en) * | 2021-09-30 | 2023-07-07 | 深圳供电局有限公司 | Multi-voltage-level static and dynamic reactive power configuration method for multi-direct-current feed-in power grid |
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| CN102082437A (en) * | 2009-11-30 | 2011-06-01 | 吉林省电力有限公司长春供电公司 | Grid no-power vacancy calculating and optimizing device |
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