CN103094905A - 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 electric power system, be specifically related to a kind of system of selection of the dynamic passive compensation collocation point based on many feed-ins of direct current short circuit ratio.
Background technology
High voltage direct current transmission and AC network are interconnected, will form interaction and impact between ac and dc systems.If AC network intensity a little less than, can have the series of problems such as Voltage Instability Transient Instability, dynamic overvoltage and harmonic instability.The size of AC system and direct current system interaction, and to the order of severity of electric network influencing depends on the relative size of AC system and connect direct current system capacity to a great extent.The power of AC network can reflect the susceptibility of element to various disturbances in system.Strong AC system does not have significant voltage or merit angle variation to the load variations disturbance, but for weak AC system, individual little disturbance just might 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, usually adopt direct-current short circuit than (Short Curccut Ratioo, SCR) or effectively short circuit ratio (Effcttvee Short Curcuit Ratio, ESCR) come the intensity of quantitative assessment AC network that current conversion station connects, optimization selection and power system operating mode reasonable arrangement that SCR and ECRR can be power network planning scheme provide reference.
For single feed-in direct current system, its system model as shown in Figure 1, SCR wherein and the definition of ESCR are as follows respectively, S in formula
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.
Effectively in the calculating of short circuit ratio, rejected the capacitive charge power impact of reactive power compensator, its numerical value is the intensity of objective appraisal AC network more usually.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 are a little less than AC system;
3, ESCR＜2, AC system extremely a little less than.
Concentrate drop point in the system of same interchange receiving end electrical network for many times direct currents, adopt single feed-in direct-current short circuit than computing formula, can't take into account influencing each other and acting between each time direct current, the result that obtains is often relatively optimistic.Concentrate feedthrough system for many direct currents, its system model a kind ofly takes into account that each time direct current influences each other and AC network intensity evaluation index many feed-ins short circuit ratio (MSCR) of acting on is defined as follows as shown in Figure 2:
In formula, P
di, Z
siBe respectively i and return the operate power of DC line and the self-impedance of change of current bus; Z
iiBe the mutual impedance between DC line i and j change of current bus.
Adopt the MSCR quantitative target to estimate AC system strong and weak, its criteria for classifying is consistent with ESCR, that is: the standard according to the effective short circuit ratio evaluation of many direct currents AC system power is:
1, MSCR〉3, AC system is strong;
2,2＜MSCR＜3 are a little less than AC system;
3, MSCR＜2, AC system extremely a little less than.
The circuit diagram of static reacance generator STATCOM as shown in Figure 3, its operation principle is to obtain voltage from three phase network to charge to a dc capacitor, then direct voltage is reverse into alternating voltage sends electrical network back to.
If the voltage that produces is greater than system voltage, 90 ° of the electric current leading voltages that flows through on transformer so make condensive load on the electrical network band, and STATCOM supply in other words is idle; If the voltage that produces less than system voltage, flows through 90 ° of the electric current lagging voltages of transformer, make STATCOM become inductive load, STATCOM absorbs idle in other words.Like this, just can obtain suitable idle output if regulate on demand the voltage of generator, and STATCOM can be between perception and capacitive continuous setup fast.Can above-mentioned principle be described with phasor relation after simplifying (omitting harmonic wave).
The dc bus capacitor of reacance generator only provides direct voltage, and its voltage side is obtained by 6 diode chargings of three-phase.Therefore, when system voltage descends, still can confess specified reactive current.And the equipment of other static compensator class, the electric current of its output and voltage are proportional reducing.On principle, reacance generator has the effect that supports better voltage 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 passive compensation collocation point based on many feed-ins of direct current short circuit ratio, has solved the problem of line voltage shakiness.
The system of selection of a kind of dynamic passive compensation collocation point provided by the invention, its improvements be, 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 the prediction fault;
(3) calculate many feed-ins of direct current short circuit ratio;
(4) stablize weak spot according to the short circuit ratio predicted voltage;
(5) the voltage stabilization weak spot of prediction is carried out the emulation verification, if result determines it is to be the voltage stabilization weak spot, configure dynamic reactive compensation device.
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 load distribute, the DC transmission system model and parameter, FACTS device model and parameter.
Wherein, the fault of step (2) prediction comprises that alternating current circuit N-1 or N-2 fault can occur in prediction.
Wherein, according to the element in system mode set omega in the topological structure determining step (2) of direct current system.
Wherein, step (3) many feed-ins of described calculating direct current short circuit ratio comprises:
1) under the electrical network normal operating condition, calculate many feed-ins short circuit ratio of each direct current receiving-end system;
2) choose one by one wherein element from the system mode set omega after the prediction fault of enumerating, calculate many feed-ins short circuit ratio of each direct current receiving-end system.
Wherein, when following situation occurring in step (4), it is predicted as the voltage stabilization weak spot of direct current receiving-end system:
1. under the 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, and compare under the electrical network normal operating condition, many feed-ins short circuit ratio descends and surpasses 40%.
Near region of the present invention circuit refers to: standing erectly with dc inversion connects the circuit that links, or the circuit that directly links of the transformer station adjacent with the dc inversion station.(lower same)
Wherein, when step (5) was carried out the emulation verification, the verification fault type was selected as follows:
All interconnector N-1 of A, dc inversion station and AC system and N-2 fault;
B, cause many feed-ins short circuit ratio under malfunction less than 3 direct current receiving-end system near region alternating current circuit N-1 or N-2 fault; With
C, cause with the electrical network normal operating condition under compare, many feed-ins short circuit ratio descend to surpass alternating current circuit N-1 or N-2 fault near 40% direct current receiving-end system.
Wherein, step (5) step that the voltage stabilization weak spot of prediction is carried out the emulation verification comprises:
I, selection fault type, system's operation;
II, a certain moment of setting break down;
III, excision produce the circuit of this fault;
IV, judge that whether system can recover normal operating condition, if can not return to normal operating condition, is defined as the voltage stabilization weak spot.
Wherein, after step (5) configuration dynamic reactive compensation device, carry out fault simulation and calculate, can the checking reactive compensation capacity satisfy the requirement of power system restoration normal condition.
Wherein, after described fault simulation calculated the capacity that refers to dynamic reactive compensation device and joins the voltage stabilization weak spot, the fault that the unstability situation voltage stabilization weak spot occurred was carried out the emulation verification again, and whether checking is stable.
Compared with prior art, beneficial effect of the present invention is:
The present invention is by the state after the taking into account system fault and the fault influence to system, made up many feed-ins short circuit ratioes as the index that obtains by static calculation on fault transient process on the impact of system and fault after the consideration of system state change not enough, calculating simplicity is quick, and can find by the simple analysis to result potential voltage stabilization weak spot, instruct the formulation work of dynamic reactive compensation device allocation plan.
The present invention carries out omnibearing simulation by enumerating the system mode set of predicting after fault to electrical network, can navigate to fast the voltage stabilization weak spot, has saved the time when the hunting zone is wide.
Description of drawings
Fig. 1 is single infeed HVDC Systems model schematic diagram;
Fig. 2 is multi-infeed HVDC transmission system model schematic diagram;
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 the partial electric grid structural topology figure of certain province provided by the invention, and wherein STA1 ~ STA35 represents 500kV transformer station; RTS1 ~ RTS7 represents the dc inversion station; PLANT1 ~ PLANT4 represents the power plant.
Fig. 6 is near the part substation bus bar voltage curve of DCS4 during fault simulation provided by the invention calculates; Wherein inverted triangle represents the magnitude of voltage of STA34; The magnitude of voltage of square expression STA35; The magnitude of voltage of circular expression STA33; In figure, transverse axis represents the time, and 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 chart from AC system.In figure, transverse axis represents the time, and unit is second; The longitudinal axis represents reactive power, and unit is Mvar.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The system of selection of the present embodiment provides a kind of dynamic passive compensation collocation point based on many feed-ins of direct current short circuit ratio, its flow chart as shown in Figure 4.Take certain province electrical network system as simulation example, illustrate that this alternating current-direct current of calculating mixes the many feed-ins short circuit ratio under the different running statuses of interior each direct current of receiving end electric power system, find out system voltage and stablize weak spot and finally determine the implementation method that dynamic reactive benefit device is repaid collocation point:
(1) set up the BPA simulation calculation data of this province's electrical network;
The electric network composition topological diagram of certain province 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 load distribute, the DC transmission system model and parameter, FACTS device model and parameter.
(2) calculate preparation;
In this province's electrical network, total direct current system is 7, difference called after DCS1 ~ DCS7, Inverter Station difference called after RTS1 ~ RTS7 that each direct current system is corresponding, if the interconnector of first Inverter Station and AC system is called after LRTS11 ~ RTS1n respectively, the interconnector of second Inverter Station and AC system is called after LRTS21 ~ RTS2n respectively, by that analogy, until 7 direct current systems all name.
System mode set omega after the prediction fault can be: LRTS11 off-state, LRTS12 off-state etc.The present embodiment is take fault point that the direct current receiving-end system has the greatest impact as the example explanation.
(3) many feed-ins of the direct current short circuit ratio under different conditions is calculated;
Many feed-ins short circuit ratio result of calculation under normal operating condition is as shown in table 1.
Many feed-ins of table 1 normal operating condition direct current short circuit ratio
| Direct current 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 | The 2500(one pole) | 8.07 |
| DCS7 | 3200(is bipolar) | 4.83 |
Many feed-ins of part short circuit ratio result of calculation after fault under state is as shown in table 2.
Many feed-ins of state direct current short circuit ratio after table 2 fault
(4) interpretation of result;
As can be seen from Table 1 under normal operating condition, there is no many feed-ins short circuit ratio less than 3 direct current system.
Table 2 has been listed many feed-ins of the part short circuit ratio result of calculation under state after the fault, under state after alternating current circuit generation N-1 or N-2 fault, there is no many feed-ins short circuit ratio less than 3 direct current system yet, but DCS4 two circuits of LRTS43 and LRTS44 occur the N-2 faults out of service after, many feed-ins short circuit ratio has descended 53.2%, need to carry out the transient emulation calculation check to this fault.
(5) emulation verification;
The step of the voltage stabilization weak spot of prediction being carried out the emulation verification comprises:
I, selection fault type, system's operation;
II, a certain moment of setting break down;
III, excision produce the circuit of this fault;
IV, judge whether system can recover normal operating condition, if can not return to normal operating condition, is defined as the voltage stabilization weak spot, if can return to normal operating condition, judgement is changed the time and is not the voltage stabilization weak spot.
LRTS43 and two circuits generation N-2 faults of LRTS44 are carried out analogue simulation, near DCS4, part substation bus bar voltage curve as shown in Figure 6, DCS4 absorbs idle curve chart as shown in Figure 7 from AC system, after finding fault, DCS4 direct current system power can't recover, lasting idle from the AC system absorption, finally cause the electrical network unstability.
At the STATCOM device of the Inverter Station RTS4 of DCS4 direct current system configuration 2 pool-sizes ± 200Mvar, the circuit diagram of its device as shown in Figure 3.
After the configuration dynamic reactive compensation device, then carry out fault simulation and calculate, can the verification reactive compensation capacity satisfy and become the voltage stabilization weak spot again normal point.LRTS43 and two circuits generation N-2 faults of LRTS44 are carried out simulation calculation, and result is stable, illustrates at this voltage stabilization weak spot configuration dynamic reactive compensation device of RTS4 to have comparatively significantly effect.
Should be noted that at last: 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, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. the system of selection of a dynamic passive compensation collocation 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 the prediction fault;
(3) calculate many feed-ins of direct current short circuit ratio;
(4) stablize weak spot according to the short circuit ratio predicted voltage;
(5) the voltage stabilization weak spot of prediction is carried out the emulation verification, if result determines it is to be the voltage stabilization weak spot, configure dynamic reactive compensation device.
2. system of selection as claimed in claim 1, it is characterized in that, 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 load distribute, the DC transmission system model and parameter, FACTS device model and parameter.
3. system of selection as claimed in claim 1, is characterized in that, the fault of step (2) prediction comprises that alternating current circuit N-1 or N-2 fault can occur in prediction.
4. 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 direct current system.
5. system of selection as claimed in claim 1, is characterized in that, step (3) many feed-ins of described calculating direct current short circuit ratio comprises:
1) under the electrical network normal operating condition, calculate many feed-ins short circuit ratio of each direct current receiving-end system;
2) choose one by one wherein element from the system mode set omega after the prediction fault of enumerating, calculate many feed-ins short circuit ratio of each direct current receiving-end system.
6. system of selection as claimed in claim 1, is characterized in that, when following situation occurring in step (4), it is predicted as the voltage stabilization weak spot of direct current receiving-end system:
1. under the 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, and compare under the electrical network normal operating condition, many feed-ins short circuit ratio descends and surpasses 40%.
7. system of selection as claimed in claim 1, is characterized in that, when step (5) was carried out the emulation verification, the verification fault type was selected as follows:
All interconnector N-1 of A, dc inversion station and AC system and N-2 fault;
B, cause many feed-ins short circuit ratio under malfunction less than 3 direct current receiving-end system near region alternating current circuit N-1 or N-2 fault; With
C, cause with the electrical network normal operating condition under compare, many feed-ins short circuit ratio descend to surpass alternating current circuit N-1 or N-2 fault near 40% direct current receiving-end system.
8. system of selection as claimed in claim 1, is characterized in that, the step that step (5) is carried out the emulation verification to the voltage stabilization weak spot of prediction comprises:
I, selection fault type, system's operation;
II, a certain moment of setting break down;
III, excision produce the circuit of this fault;
IV, judge that whether system can recover normal operating condition, if can not return to normal operating condition, is defined as the voltage stabilization weak spot.
9. system of selection as claimed in claim 1, is characterized in that, after step (5) configuration dynamic reactive compensation device, carries out fault simulation and calculate, the checking reactive compensation capacity.
10. system of selection as claimed in claim 9, it is characterized in that, after described fault simulation calculated the capacity that refers to dynamic reactive compensation device and joins the voltage stabilization weak spot, the fault that the unstability situation voltage stabilization weak spot occurred was carried out the emulation verification again, and whether checking is stable.
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| CN103296685A (en) * | 2013-05-27 | 2013-09-11 | 国家电网公司 | SVC (static var compensator) compensation strategy optimizing method |
| CN103427427A (en) * | 2013-05-31 | 2013-12-04 | 国家电网公司 | Power grid source steady state voltage regulating optimization method for improving transient voltage support capability of power grid |
| CN103580022A (en) * | 2013-11-05 | 2014-02-12 | 国家电网公司 | Electrical power system dynamic reactive storage computing method |
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| CN103427427A (en) * | 2013-05-31 | 2013-12-04 | 国家电网公司 | Power grid source steady state voltage regulating optimization method for improving transient voltage support capability of power grid |
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| CN111030127A (en) * | 2019-11-21 | 2020-04-17 | 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 |
| 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 |
| CN113852142A (en) * | 2021-09-30 | 2021-12-28 | 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 |
| 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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