CN111769572B - Generator tripping optimization method considering voltage constraint after extra-high voltage direct current blocking - Google Patents
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- H—ELECTRICITY
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Abstract
The invention belongs to the field of power systems, in particular to a tripping optimization method for considering voltage constraint after extra-high voltage direct current blocking, aiming at solving the problem of providing a tripping method capable of solving the problem that the system voltage is unreasonably fluctuated to further restrict extra-high voltage direct current transmission capacity, and adopting the technical scheme that: step 1, evaluating the influence of active power changes of different generator sets on bus voltage of a converter station; step 2, evaluating the influence of the reactive power change of different generator sets on the bus voltage of the converter station; step 3, evaluating the influence of the generator tripping machine on the bus voltage of the converter station after considering the running state of the unit; and 4, optimizing the selection of the cut-off unit, wherein the invention is widely applied to the technical field of the voltage-constrained cutting machine after the ultrahigh voltage direct current is locked.
Description
Technical Field
The invention belongs to the field of power systems, and particularly relates to a tripping optimization method considering voltage constraints after extra-high voltage direct current blocking.
Background
The extra-high voltage direct current is one of necessary means for solving the long-term coexistence situation that the energy resource distribution and the economic development level in China are unbalanced, the energy consumption in the west is difficult to break, the electricity is serious and the electricity in the middle and east is in short supply. The extra-high voltage direct current transmission capacity is large, the quantity of machine switching devices of a power transmission end is large after a blocking fault occurs, meanwhile, the voltage fluctuation of an alternating current system is easily caused by the backspacing of a tide, the balance of active power is usually considered in the conventional safety control, the frequency stability of the power grid is ensured, and the influence of reactive voltage change on the system operation caused by a machine switching mode is less considered; when the direct current operation mode is determined, the direct current power in the normal operation mode before the fault is often determined by the voltage after the direct current fault, so that whether the tripping strategy is reasonable or not directly influences the transmission capacity of the extra-high voltage direct current.
Disclosure of Invention
The invention overcomes the defects in the prior art, provides a tripping optimization method for considering voltage constraint after extra-high voltage direct current blocking, and solves the technical problem that the extra-high voltage direct current transmission capacity is restricted due to large-amplitude fluctuation of system voltage caused by unreasonable tripping mode.
In order to solve the technical problems, the invention adopts the technical scheme that: a generator tripping optimization method considering voltage constraint after extra-high voltage direct current blocking comprises the following steps:
step 1, evaluating the influence of active power changes of different generator sets on bus voltage of a converter station;
firstly, the initial voltage of a bus of the converter station under the static working condition of the system is recorded asU dc The candidate gensets are noted as G1, G2,……，Gk，kthe number of the generator sets is defined as a set C;
under the static working condition, after all candidate generator sets reduce the same active power output amount delta P while keeping the reactive power output unchanged, the bus voltages of the converter station are recorded asU dc_P1 ，U dc_P2 ，……，U dc_Pk Calculating a voltage variation value DeltaU dc_P1 =U dc_P1 -U dc ，ΔU dc_P2 =U dc_P2 -U dc ，……，ΔU dc_Pk =U dc_Pk -U dc ；Respectively calculating the sensitivity of the active output of each generator set to the bus voltage influence of the converter station, wherein the calculation formula is respectively deltaU dc_P1 /ΔP，ΔU dc_P2 /ΔP，……，ΔU dc_Pk /Δ P; if the sensitivity is positive, the converter station bus voltage is increased under the condition that the active power delta P of the unit is reduced, and if the sensitivity is negative, the converter station bus voltage is decreased;
step 2, evaluating the influence of the reactive power change of different generator sets on the bus voltage of the converter station;
under the same static working condition as the step 1, after all candidate generator sets reduce the same reactive power output quantity delta Q while keeping the active power output unchanged, the bus voltages of the converter stations are recorded asU dc_Q1 ，U dc_Q2 ，……，U dc_Qk Calculating a voltage variation value DeltaU dc_Q1 =U dc_Q1 -U dc ，ΔU dc_Q2 =U dc_Q2 -U dc ，……，ΔU dc_Qk =U dc_Qk -U dc ；Respectively calculating the sensitivity of the active output of each generator set to the bus voltage influence of the converter station, wherein the calculation formula is respectively deltaU dc_Q1 /ΔQ，ΔU dc_Q2 /ΔQ，……，ΔU dc_Qk /Δ Q; if the sensitivity is positive, the voltage of the bus of the converter station is increased under the condition that the reactive power delta Q of the unit is reduced, and if the sensitivity is negative, the voltage of the bus of the converter station is reduced;
step 3, evaluating the influence of the generator tripping machine on the bus voltage of the converter station after considering the running state of the unit;
acquiring actual active power P1, … …, Pk and reactive power Q1, wherein the actual active power is multiplied by active-voltage sensitivity to obtain actual active generator tripping voltage change calculated quantity, namely delta U _ P1_ act, delta U _ P2_ act, … … and delta U _ Pk _ act, of each generator in the set C, and the calculation formulas are respectively delta U _ P1_ act = delta U _ Pk _ actU dc_P1 /ΔP×P1，ΔU_P2_act=ΔU dc_P2 /ΔP×P2，……，ΔU_Pk_act=ΔU dc_Pk /Δ P × Pk; the actual reactive power is multiplied by the reactive-voltage sensitivity to obtain actual reactive power tripping voltage change calculated quantities, namely delta U _ Q1_ act, delta U _ Q2_ act, … … and delta U _ Qk _ act, and the calculation formulas are respectively delta U _ Q1_ act = deltaU dc_Q1 /ΔQ×Q1，ΔU_Q2_act=ΔU dc_Q2 /ΔQ×Q2，……，ΔU_Qk_act=ΔU dc_Qk /Δ Q × Qk; adding the actual active tripping voltage change calculated quantity and the actual reactive tripping voltage change calculated quantity to obtain a comprehensive tripping voltage change calculated quantity delta U _ act1, delta U _ act2, … … and delta U _ act, wherein the calculation formulas are respectively delta U _ act1= delta U _ P1_ act + delta U _ Q1_ act, delta U _ act2= delta U _ P2_ act + delta U _ Q2_ act, … … and delta U _ act = delta U _ Pk _ act + delta U _ Qk _ act, and sorting the comprehensive tripping voltage change calculated quantity from small to large;
step 4, optimizing the selection of the cut unit;
taking an absolute value of the comprehensive tripping voltage change calculated quantity in the step 3, marking a machine set with the minimum absolute value as a first cutting machine set G0, respectively selecting the machine set from the position of G0 in the comprehensive tripping voltage change calculated quantity sequence in the step 3 upwards and downwards in sequence as a candidate cutting machine set, sequencing the candidate cutting machine set, marking the sequence as a sequence A, and marking the machine sets as GA1, GA2, … … and GAk; sequentially selecting the machine set from the position of G0 in the comprehensive cutter voltage change calculated quantity sequence in the step 3 downwards and upwards as a candidate cutter set, sequencing the candidate cutter set, recording the sequence as a sequence B, and recording the machine sets as GB1, GB2, … … and GBk respectively; and selecting the generator tripping combination CA and CB according to the unit sequence in the sequence A and the sequence B respectively by taking the generator tripping amount sigma P as a target value.
Calculating the total voltage change calculation amount in CA and CB, wherein delta U _ CA =sigmadelta U _ actCA and delta U _ CB =sigmadelta U _ actCB; calculating the number of the units in CA and CB and marking as Na and Nb; if Na = Nb, selecting a unit combination with a smaller absolute value from the delta U _ CA and the delta U _ CB; if Na ≠ Nb, the smaller unit combination of Na and Nb is selected.
Compared with the prior art, the invention has the beneficial effects that: the voltage change calculation amount of the comprehensive cutting machine is calculated, and the voltage change calculation amount of the comprehensive cutting machine is sorted from small to large; and (3) taking the machine set with the minimum absolute value as a first cutting machine set G0, respectively selecting the machine sets upwards and downwards from the position of G0 in the comprehensive cutting machine voltage change calculation quantity sequence in the step (3) as candidate cutting machine sets, sequencing the candidate cutting machine sets, and respectively selecting cutting machine combinations CA and CB according to the sequence of the machine sets in the sequence A and the sequence B by taking the cutting machine quantity sigma P as a target value. By the aid of the cutting mode, the technical problem that the voltage of a system fluctuates greatly due to unreasonable cutting mode, and accordingly extra-high voltage direct current transmission capacity is restricted is solved.
Detailed Description
This will be further explained in conjunction with the following.
The invention provides a tripping optimization method for considering voltage constraint after extra-high voltage direct current blocking, which is characterized in that tripping sequence is optimized and sorted by calculating the influence sensitivity of active power of each generator set on the bus voltage of a converter station and the influence sensitivity of reactive power of each generator set on the bus voltage of the converter station, calculating to obtain comprehensive tripping voltage change calculated quantity, taking the tripping quantity sigma P as a target value and taking the generator set G0 with the minimum absolute value of the comprehensive tripping voltage change calculated quantity as a first tripping generator set, so that the technical problem that the extra-high voltage direct current transmission capability is restricted due to large fluctuation of system voltage caused by unreasonable tripping mode is solved.
A generator tripping optimization method considering voltage constraint after extra-high voltage direct current blocking comprises the following steps:
step 1, evaluating the influence of active power changes of different generator sets on bus voltage of a converter station;
firstly, the initial voltage of a bus of the converter station under the static working condition of the system is recorded asU dc The candidate gensets are noted as G1, G2,……，Gk，kthe number of the generator sets is defined as a set C;
under the static working condition, after all candidate generator sets reduce the same active power output amount delta P while keeping the reactive power output unchanged, the bus voltages of the converter station are recorded asU dc_P1 ，U dc_P2 ，……，U dc_Pk Calculating a voltage variation value DeltaU dc_P1 =U dc_P1 -U dc ，ΔU dc_P2 =U dc_P2 -U dc ，……，ΔU dc_Pk =U dc_Pk -U dc ；Respectively calculating the sensitivity of the active output of each generator set to the bus voltage influence of the converter station, wherein the calculation formula is respectively deltaU dc_P1 /ΔP，ΔU dc_P2 /ΔP，……，ΔU dc_Pk /Δ P; if the sensitivity is positive, the converter station bus voltage is increased under the condition that the active power delta P of the unit is reduced, and if the sensitivity is negative, the converter station bus voltage is decreased;
step 2, evaluating the influence of the reactive power change of different generator sets on the bus voltage of the converter station;
under the same static working condition as the step 1, after all candidate generator sets reduce the same reactive power output quantity delta Q while keeping the active power output unchanged, the bus voltages of the converter stations are recorded asU dc_Q1 ，U dc_Q2 ，……，U dc_Qk Calculating a voltage variation value DeltaU dc_Q1 =U dc_Q1 -U dc ，ΔU dc_Q2 =U dc_Q2 -U dc ，……，ΔU dc_Qk =U dc_Qk -U dc ；Respectively calculating the sensitivity of the active output of each generator set to the bus voltage influence of the converter station, wherein the calculation formula is respectively deltaU dc_Q1 /ΔQ，ΔU dc_Q2 /ΔQ，……，ΔU dc_Qk /Δ Q; if the sensitivity is positive, the voltage of the bus of the converter station is increased under the condition that the reactive power delta Q of the unit is reduced, and if the sensitivity is negative, the voltage of the bus of the converter station is reduced;
step 3, evaluating the influence of the generator tripping machine on the bus voltage of the converter station after considering the running state of the unit;
acquiring actual active power P1, … …, Pk and reactive power Q1, wherein the actual active power is multiplied by active-voltage sensitivity to obtain actual active generator tripping voltage change calculated quantity, namely delta U _ P1_ act, delta U _ P2_ act, … … and delta U _ Pk _ act, of each generator in the set C, and the calculation formulas are respectively delta U _ P1_ act = delta U _ Pk _ actU dc_P1 /ΔP×P1，ΔU_P2_act=ΔU dc_P2 /ΔP×P2，……，ΔU_Pk_act=ΔU dc_Pk /Δ P × Pk; the actual reactive power is multiplied by the reactive-voltage sensitivity to obtain actual reactive power tripping voltage change calculated quantities, namely delta U _ Q1_ act, delta U _ Q2_ act, … … and delta U _ Qk _ act, and the calculation formulas are respectively delta U _ Q1_ act = deltaU dc_Q1 /ΔQ×Q1，ΔU_Q2_act=ΔU dc_Q2 /ΔQ×Q2，……，ΔU_Qk_act=ΔU dc_Qk /Δ Q × Qk; adding the actual active tripping voltage change calculated quantity and the actual reactive tripping voltage change calculated quantity to obtain a comprehensive tripping voltage change calculated quantity delta U _ act1, delta U _ act2, … … and delta U _ act, wherein the calculation formulas are respectively delta U _ act1= delta U _ P1_ act + delta U _ Q1_ act, delta U _ act2= delta U _ P2_ act + delta U _ Q2_ act, … … and delta U _ act = delta U _ Pk _ act + delta U _ Qk _ act, and sorting the comprehensive tripping voltage change calculated quantity from small to large;
step 4, optimizing the selection of the cut unit;
taking an absolute value of the comprehensive tripping voltage change calculated quantity in the step 3, marking a machine set with the minimum absolute value as a first cutting machine set G0, respectively selecting the machine set from the position of G0 in the comprehensive tripping voltage change calculated quantity sequence in the step 3 upwards and downwards in sequence as a candidate cutting machine set, sequencing the candidate cutting machine set, marking the sequence as a sequence A, and marking the machine sets as GA1, GA2, … … and GAk; sequentially selecting the machine set from the position of G0 in the comprehensive cutter voltage change calculated quantity sequence in the step 3 downwards and upwards as a candidate cutter set, sequencing the candidate cutter set, recording the sequence as a sequence B, and recording the machine sets as GB1, GB2, … … and GBk respectively; and selecting the generator tripping combination CA and CB according to the unit sequence in the sequence A and the sequence B respectively by taking the generator tripping amount sigma P as a target value.
Calculating the total voltage change calculation amount in CA and CB, wherein delta U _ CA =sigmadelta U _ actCA and delta U _ CB =sigmadelta U _ actCB; calculating the number of the units in CA and CB and marking as Na and Nb; if Na = Nb, selecting a unit combination with a smaller absolute value from the delta U _ CA and the delta U _ CB; if Na ≠ Nb, the smaller unit combination of Na and Nb is selected.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (2)
1. A generator tripping optimization method considering voltage constraints after extra-high voltage direct current blocking is characterized by comprising the following steps:
step 1, evaluating the influence of active power changes of different generator sets on bus voltage of a converter station;
firstly, the initial voltage of a bus of the converter station under the static working condition of the system is recorded asU dc The candidate gensets are noted as G1, G2,……，Gk，kthe number of the generator sets is defined as a set C;
under the static working condition, after all candidate generator sets reduce the same active power output amount delta P while keeping the reactive power output unchanged, the bus voltages of the converter station are recorded asU dc_P1 ，U dc_P2 ，……，U dc_Pk Calculating a voltage variation value DeltaU dc_P1 =U dc_P1 - U dc ，ΔU dc_P2 =U dc_P2 -U dc ，……，ΔU dc_Pk =U dc_Pk -U dc ；Respectively calculating the sensitivity of the influence of the reactive output of each generator set on the bus voltage of the converter station, wherein the calculation formula is respectively deltaU dc_P1 /ΔP，ΔU dc_P2 /ΔP，……，ΔU dc_Pk /ΔP；
Step 2, evaluating the influence of the reactive power change of different generator sets on the bus voltage of the converter station;
under the same static working condition as the step 1, after all candidate generator sets reduce the same reactive power output quantity delta Q while keeping the active power output unchanged, the bus voltages of the converter stations are recorded asU dc_Q1 ，U dc_Q2 ，……，U dc_Qk Calculating a voltage variation value DeltaU dc_Q1 =U dc_Q1 -U dc ，ΔU dc_Q2 =U dc_Q2 -U dc ，……，ΔU dc_Qk =U dc_Qk -U dc ；Respectively calculating the sensitivity of the active output of each generator set to the bus voltage influence of the converter station, wherein the calculation formula is respectively deltaU dc_Q1 /ΔQ，ΔU dc_Q2 /ΔQ，……，ΔU dc_Qk /ΔQ；
Step 3, evaluating the influence of the generator tripping machine on the bus voltage of the converter station after considering the running state of the unit;
acquiring actual active power P1, … …, Pk and reactive power Q1, wherein the actual active power is multiplied by active-voltage sensitivity to obtain actual active generator tripping voltage change calculated quantity, namely delta U _ P1_ act, delta U _ P2_ act, … … and delta U _ Pk _ act, of each generator in the set C, and the calculation formulas are respectively delta U _ P1_ act = delta U _ Pk _ actU dc_P1 /ΔP×P1，ΔU_P2_act=ΔU dc_P2 /ΔP×P2，……，ΔU_Pk_act=ΔU dc_Pk /Δ P × Pk; the actual reactive power is multiplied by the reactive-voltage sensitivity to obtain actual reactive power tripping voltage change calculated quantities, namely delta U _ Q1_ act, delta U _ Q2_ act, … … and delta U _ Qk _ act, and the calculation formulas are respectively delta U _ Q1_ act = deltaU dc_Q1 /ΔQ×Q1，ΔU_Q2_act=ΔU dc_Q2 /ΔQ×Q2，……，ΔU_Qk_act=ΔU dc_Qk /Δ Q × Qk; adding the actual active tripping voltage change calculated quantity and the actual reactive tripping voltage change calculated quantity to obtain a comprehensive tripping voltage change calculated quantity delta U _ act1, delta U _ act2, … … and delta U _ act, wherein the calculation formulas are respectively delta U _ act1= delta U _ P1_ act + delta U _ Q1_ act, delta U _ act2= delta U _ P2_ act + delta U _ Q2_ act, … … and delta U _ act = delta U _ Pk _ act + delta U _ Qk _ act, and sorting the comprehensive tripping voltage change calculated quantity from small to large;
step 4, optimizing the selection of the cut unit;
taking an absolute value of the comprehensive tripping voltage change calculated quantity in the step 3, marking a machine set with the minimum absolute value as a first cutting machine set G0, respectively selecting the machine set from the position of G0 in the comprehensive tripping voltage change calculated quantity sequence in the step 3 upwards and downwards in sequence as a candidate cutting machine set, sequencing the candidate cutting machine set, marking the sequence as a sequence A, and marking the machine sets as GA1, GA2, … … and GAk; sequentially selecting the machine set from the position of G0 in the comprehensive cutter voltage change calculated quantity sequence in the step 3 downwards and upwards as a candidate cutter set, sequencing the candidate cutter set, recording the sequence as a sequence B, and recording the machine sets as GB1, GB2, … … and GBk respectively; and selecting the generator tripping combination CA and CB according to the unit sequence in the sequence A and the sequence B respectively by taking the generator tripping amount sigma P as a target value.
2. The method of claim 1, wherein the total voltage change calculation in CA and CB is calculated, and Δ U _ CA =ΣΔ U _ actCA and Δ U _ CB =ΣΔ U _ actCB; calculating the number of the units in CA and CB and marking as Na and Nb; if Na = Nb, selecting a unit combination with a smaller absolute value from the delta U _ CA and the delta U _ CB; if Na ≠ Nb, the smaller unit combination of Na and Nb is selected.
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| ±800 kV 雁淮特高压直流送端电网安全稳定特性及控制策略;潘捷 等;《中国电力》;20180430;第7-14页 * |
| The Forecasting Model of Reactive Power Based on SVM;Liming Bo 等;《2020 IEEE 4th Information Technology,Networking,Electronic and Automation Control Conference (ITNEC 2020)》;20200513;第2136-2140页 * |
| 针对直流闭锁故障的协调二级电压紧急控制模型;李婷 等;《电网技术》;20121231;第137-144页 * |
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