CN107565594B - Multi-DC-to-DC power boost distribution method considering influence of terminal voltage deviation - Google Patents
Multi-DC-to-DC power boost distribution method considering influence of terminal voltage deviation Download PDFInfo
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Abstract
The invention discloses a multi-direct-current inter-power-boost distribution method considering influence of terminal voltage deviation. The method comprises the steps of collecting and measuring direct current real-time transmission power, inversion side converter bus voltage, direct current unblocking state and protection tripping signals, carrying out distribution calculation of active power lifting amount among multiple direct currents considering influence of terminal voltage deviation by comprehensively considering influence of alternating current power grid strength and power flow transfer after a power grid has a blocking fault and meets preset blocking criteria, and then issuing a power lifting instruction and a stability control tripping instruction to achieve the purpose of enhancing frequency and voltage stability of a sending terminal and a receiving terminal system after direct current blocking. The invention solves the problem of over-frequency of a sending end system caused by high-capacity direct current locking and avoids the risk of over-low voltage of a receiving end system caused by unreasonable power distribution.
Description
Technical Field
The invention belongs to the technical field of safety and stability control of a power system, and particularly relates to a multi-direct-current-room power boost distribution method considering influence of terminal voltage deviation.
Background
The multi-direct-current output power grid runs in an island mode, and the power grid net rack is very weak. When the direct current is subjected to unipolar or bipolar locking, a large amount of excess power appears in a sending-end power grid, and the problem of frequency stability is obvious. The current main frequency control means comprise primary frequency modulation, stable control cutting machine, FLC, direct current power lifting/dropping and the like of the machine set. In the case of emergency power assist, dc overload capacity needs to be exhibited. Meanwhile, the potential undervoltage risk caused by the power flow transfer of the receiving end system after the direct current power is boosted needs to be considered.
Taking a sending-end Yunnan power grid of a southern power grid as an example, up to 2016, the Yunnan power grid has 6 loops of direct-current transmission systems to realize asynchronous networking with a southern power grid main network. Wherein cattle fall into the Guangdong power grid from three high-voltage/extra-high-voltage direct currents of direct current Chusui direct current and general bridge direct current. Due to the characteristics of concentrated drop points and tight coupling of the Guangdong power grid receiving end converter stations, the interaction of the alternating current and direct current systems and the mutual coupling of the multiple direct current converter stations have great influence on the safety and stability of the receiving end system. If a large capacity locking occurs to a certain direct current, a large amount of power surplus occurs in a sending end system, and the problem of sending end system over-frequency is caused. The problem of over-frequency of a sending end can be effectively relieved by utilizing the emergency lifting function of the direct current power. However, if the power boost quantity between different direct currents is not distributed reasonably, the receiving end system has large-range load flow transfer, and the problem of too low voltage level in a heavy-load area of the receiving end can be caused. Therefore, if the control quantity can be reasonably distributed after the fault, namely, the moisture transfer quantity of the receiving end system is reduced on the basis of ensuring the safe and stable operation of the system, the method can play an active role in the safe and stable operation of the power grid.
The invention provides an effective solution by utilizing the rapidity and controllability of a direct current system aiming at the problems of system frequency and voltage after high-capacity direct current locking in the current power grid.
Disclosure of Invention
The invention provides a method for distributing power boost among multiple direct currents by considering the influence of voltage deviation of a receiving end, which is used for at least solving the problem of over-frequency of a sending end system after high-capacity locking of a certain direct current and avoiding the risk of over-low voltage level of the receiving end due to improper distribution of the direct current power.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for allocating power boost amounts between multiple direct currents in consideration of influence of terminal voltage deviation, the method comprising: collecting and measuring direct current transmission power, inversion side converter bus voltage, direct current unlocking state and protection tripping signal, and determining transmission end power surplus P according to direct current locking capacity after a power grid has a locking fault and meets a preset locking criteriontotalAnd the maximum power boost of each DCSum sigma Pmax(ii) a And then, the distribution calculation of the active power boost quantity considering the influence of the terminal voltage deviation is carried out, and the issuing of a power boost instruction and a stable control tripping instruction is further realized.
A method for allocating power boost amounts between multiple direct currents in consideration of influence of terminal voltage deviation, the method comprising the steps of:
step 1, acquiring the direct current transmission power, the inversion side converter bus voltage, the direct current unlocking state and a protection tripping signal of each direct current line on line, and monitoring and judging the direct current locking state in real time on line;
Step 7, if Ptotal＞∑PmaxPerforming stable control on the cutting machine according to the minimum cutting machine principle, and then returning to the step 3 according to the cutting machine amount and the redundancy; otherwise, entering a step 8;
step 8, if Ptotal≤∑PmaxLet the sum of all supporting DC actual power boosts be PsupportA value of PtotalIf the ith supporting DC power boost is:
wherein i represents the support DC line, j represents the fail-safe DC line, PmaxDifference, η, between maximum transmission power and current transmission power for the ith support DC linej,iDistributing factors for considering the direct current power boost quantity influenced by the terminal voltage deviation;
and 9, issuing and executing a power increasing instruction and a stable control switching-off instruction, and ending.
The invention further comprises the following preferred embodiments:
in step 2, the dc link lock-out includes a unipolar lock-out and a bipolar lock-out.
In step 3, if the DC current is unipolar, P istotalA single pole blocking capacity; if bipolar blocking occurs in DC, PtotalIs a bipolar latch-up capacity.
In step 5, the voltage minimum value is preferably 0.8p.u., where p.u. is the dc line inverter side voltage per unit.
In step 6, the dc power boost allocation factor is calculated according to the following formula:
ηj,i＝EMIOESCR,i×Kj,iin the formula EMIOESCR,iEffective short-circuit ratio for multi-feed operation, Kj.iIs the power flow transfer coefficient.
In step 7, first, the amount of the cutting machine and the sigma P are calculated according to the minimum over-cutting principlemaxThe sum of which is slightly more than Ptotal；Secondly, according to the principle of under-cut, a sending end system should keep a certain power redundancy; then, the power margin P of the transmitting end is returned and corrected according to the machine cutting amount and the redundancy amounttotalA value equal to the transmit end power margin P before correctiontotalSubtracting the difference value of the sum of the machine cutting amount and the redundancy amount kept by the sending end system; wherein the certain amount of power redundancy ranges from 100MW to 500 MW.
The invention has the following beneficial technical effects: by acquiring and measuring the direct current real-time transmission power, the inversion side converter bus voltage, the direct current unblocking state and the protection tripping signal, after the direct current blocking is judged, the distribution calculation of the power increase amount among multiple direct currents considering the influence of the voltage deviation of the receiving end is carried out, and then the issuing of a power increase instruction and a tripping instruction is carried out, so that the emergency power support after the direct current blocking fault is realized, the high-frequency problem of a transmitting end system caused by the unreasonable power distribution is solved, and the risk of the voltage level deviation of the receiving end system caused by the unreasonable power distribution is avoided.
Drawings
FIG. 1 is a schematic flow chart of a method for distributing power boost among multiple direct currents in consideration of influence of terminal voltage deviation according to the present invention;
fig. 2 is a simplified system architecture diagram of an asynchronous interconnected network.
Detailed Description
In order to make the technical solutions of the present invention better understood, the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings, it is obvious that the described embodiments are only centralized control embodiments, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Example 1
According to the embodiment of the invention, the embodiment of the method for distributing the power boost quantity among the multiple direct currents considering the influence of the terminal voltage deviation is provided.
Fig. 1 is a flowchart of a method for allocating power boost amounts between multiple direct currents considering influence of terminal voltage deviation according to embodiment 1 of the present invention, as shown in fig. 1, the method specifically includes the following steps:
step 1, acquiring the direct current transmission power, the inversion side converter bus voltage, the direct current unlocking state and a protection tripping signal of each direct current line on line, and monitoring and judging the direct current locking state in real time on line;
the DC line block includes a single-pole block and a double-pole block.
if monopolar blocking occurs with DC, then PtotalA single pole blocking capacity; if bipolar blocking occurs in DC, PtotalIs a bipolar latch-up capacity.
Calculating a direct current power boost distribution factor according to the following formula:
6.1 calculating the effective short-circuit ratio E of the multi-feed operationMIOESCR,iIt is defined as:
in the formula, Saco,iThe three-phase short circuit capacity of the system at the bus position of the inverter station i converter station corresponding to the operation mode is obtained; qco,iActual reactive power is provided for the alternating current filter and the parallel capacitor of the inverter station; pdc,i、Pdc,jThe actual operating capacity of the direct current lines i and j;
is a multi-feed interaction factor.
6.2 calculating the load flow transfer coefficient Kj,iIt is defined as follows:
in the formula, Zeq_j.iIs the equivalent impedance between the faulty dc j and the inverter station supporting dc i.
6.3 calculating the DC Power boost Allocation factor etaj,iIt is defined as follows:
ηj,i＝EMIOESCR,i×Kj,i
in the formula etaj,iIndicates the supporting effect of the supporting DC system i on the failed DC system j, etaj,iThe larger the dc system i is, the better the dc system j is supported by the dc system i. If the direct current system j has a fault, calculating direct current power distribution factors of each support direct current to the direct current j, and then distributing power boost quantity among the support direct currents according to the proportion of each direct current distribution factor.
Step 7, if Ptotal＞∑PmaxPerforming stable control on the cutting machine according to the minimum cutting machine principle, and then returning to the step 3 according to the cutting machine amount and the redundancy; otherwise, entering a step 8; first, based on the minimum over-cut principle, the amount of the cutting machine and the sigma PmaxThe sum is slightly more than
Secondly, according to the principle of under-cut, a sending end system should keep a certain power redundancy (100 MW-500 MW); then, the power margin P of the transmitting end is returned and corrected according to the machine cutting amount and the redundancy amounttotalA value equal to the transmit end power margin P before correctiontotalThe difference value obtained by subtracting the sum of the amount of the machine cutting and the redundancy amount held by the sending end.
Step 8, if Ptotal≤∑PmaxLet the sum of all supporting DC actual power boosts be PsupportA value of PtotalIf the ith supporting DC power boost is:
wherein i represents the support DC, j represents the fault DC, PmaxDifference, η, between maximum transmission power and current transmission power for supporting the ith DCj,iDistributing factors for considering the direct current power boost quantity influenced by the terminal voltage deviation;
and 9, issuing and executing a power increasing instruction and a stable control switching-off instruction, and ending.
The above-described method according to the present embodiment is explained below with reference to fig. 2.
Taking fig. 2 as an example of a three-dc island operation power grid, a dc line 1 is a bipolar conventional dc of ± 500kV, and a rated active power is 2 × 1000MW, which is 2000 MW; the direct current lines 2 and 3 are bipolar conventional direct currents of +/-800 kV, and the rated active power is 2 multiplied by 1000MW to 2000 MW; three direct current rectification sides are controlled by constant current, an inversion side is controlled by constant voltage, direct current power limiters are arranged, and a frequency dead zone is 0.1 Hz. The transmission end power grid direct current circuit 1 is matched with a hydroelectric power plant G1 and has 4 machines in total, and the installed capacity is 4 multiplied by 600 to 2400 MW; the direct current circuit 2 is matched with a hydroelectric plant G2 to have 5 units, the direct current circuit 3 is matched with a hydroelectric plant G3 to have 4 units, and the installed capacity is 4 multiplied by 700 to 2800 MW. Receiving-end power plants G4-G6 are all 12 units, the installed capacity is 12 multiplied by 600-7200 MW, and the dead zones of the speed regulators are all set to be 0.05 Hz. The active load capacity of the receiving end power grid is 2000 MW.
When a bipolar latch-up fault occurs on the dc line 1 at 5 s. Step 2, detecting that direct current blocking occurs, and entering step 3; according to the step 3, determining the surplus of the direct current power, namely the locking capacity 2000 MW; according to the step 4, calculating the maximum direct current supporting capacity to be 1000 MW; according to the step 5, the voltages of the direct current 2 and the direct current 3 are both larger than the limit value, and the step 6 is carried out; according to the step 6, calculating the power distribution factors of the direct currents 2 and 3 to be 0.67 and 0.33 respectively; according to the step 7, judging that the maximum direct current support amount is smaller than the power surplus margin, cutting off two units (1200MW) of the G1 power plant according to the minimum over-cutting principle, keeping a certain power redundancy amount (100MW) at the sending end according to the under-cutting principle, and simultaneously returning to the step 3 to determine a new power surplus margin 700 MW; according to the step 7, judging that the maximum direct current support amount is larger than the power surplus, and entering a step 8; according to step 8, determining the DC power boost: the power of the direct current line 2 is increased by 469MW, and the power of the direct current line 3 is increased by 231 MW; and 9, issuing a power increasing instruction and a stable control switching-off instruction and ending.
While the best mode for carrying out the invention has been described in detail and illustrated in the accompanying drawings, it is to be understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the invention should be determined by the appended claims and any changes or modifications which fall within the true spirit and scope of the invention should be construed as broadly described herein.
Claims (5)
1. A method for allocating power boost amounts between multiple direct currents in consideration of influence of terminal voltage deviation, the method comprising the steps of:
step 1, acquiring the direct current transmission power, the inversion side converter bus voltage, the direct current unlocking state and a protection tripping signal of each direct current line on line, and monitoring and judging the direct current locking state in real time on line;
step 2, judging the direct current blocking condition according to a direct current blocking criterion, entering step 3 if one or more direct current lines are blocked, and returning to step 1 if the direct current lines are blocked;
step 3, determining the transmitting end power surplus PtotalThe value is one or more DC line blocking capacity;
step 4, determining the sum sigma P of the maximum power lifting quantities of other direct currents except the locked direct current circuitmaxThe sum of the differences between the maximum transmission power supporting dc and the current transmission power;
step 5, judging whether the voltage of the inversion side of each direct current line except the locked direct current line is lower than the minimum limit value, if the voltage of the inversion side is lower than the minimum limit value, the direct current line should quit the support, and returning to the stepStep 3, recalculate ∑ Pmax(ii) a Otherwise, entering step 6;
step 6, calculating and considering the distribution factor eta of the direct current power boost quantity influenced by the terminal voltage deviationj,i；
ηj,i＝EMIOESCR,i×Kj,i，
In the formula EMIOESCR,iEffective short-circuit ratio for multi-feed operation, Kj.iAs a power flow transfer coefficient, Zeq_j.iIs the equivalent impedance between the fault DC j and the inverter station supporting the DC i;
step 7, if Ptotal>∑PmaxPerforming stable control on the cutting machine according to the minimum cutting machine principle, and then returning to the step 3 according to the cutting machine amount and the redundancy; otherwise, entering a step 8;
first, based on the minimum over-cut principle, the amount of the cutting machine and the sigma PmaxThe sum of which is slightly more than Ptotal(ii) a Secondly, according to the principle of under-cut, a sending end system should keep a certain power redundancy; then, the power margin P of the transmitting end is returned and corrected according to the machine cutting amount and the redundancy amounttotalA value equal to the transmit end power margin P before correctiontotalSubtracting the difference value of the sum of the machine cutting amount and the redundancy amount kept by the sending end system;
step 8, if Ptotal≤∑PmaxLet the sum of all supporting DC actual power boosts be PsupportA value of PtotalIf the ith supporting DC power boost is:
wherein i represents the support DC line, j represents the fail-safe DC line, PmaxDifference, η, between maximum transmission power and current transmission power for the ith support DC linej,iDistributing factors for considering the direct current power boost quantity influenced by the terminal voltage deviation;
and 9, issuing and executing a power increasing instruction and a stable control switching-off instruction, and ending.
2. The method according to claim 1, wherein the distribution method of the power boost amounts between the multiple direct currents considering the influence of the terminal voltage deviation is characterized in that:
in step 2, the dc link lock-out includes a unipolar lock-out and a bipolar lock-out.
3. The method according to claim 2, wherein the distribution of the power boost amounts between multiple direct currents is performed in consideration of the influence of the terminal voltage deviation:
in step 3, if the DC current is unipolar, P istotalA single pole blocking capacity; if bipolar blocking occurs in DC, PtotalIs a bipolar latch-up capacity.
4. The method according to claim 1, wherein the distribution method of the power boost amounts between the multiple direct currents considering the influence of the terminal voltage deviation is characterized in that:
in step 5, the voltage minimum value is preferably 0.8p.u., where p.u. is the dc line inverter side voltage per unit.
5. The method according to claim 1, wherein the distribution method of the power boost amounts between the multiple direct currents considering the influence of the terminal voltage deviation is characterized in that:
in step 7, the certain power redundancy amount ranges from 100MW to 500 MW.
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| CN107994561A (en) * | 2018-01-10 | 2018-05-04 | 云南电网有限责任公司电力科学研究院 | It is a kind of based on the locking of direct current monopole surely control cut machine cut machine amount optimization method and device |
| CN108923412B (en) * | 2018-08-27 | 2022-05-20 | 云南电网有限责任公司电力科学研究院 | Frequency stability control method and device for multi-direct-current asynchronous transmitting-end power grid |
| CN109103919A (en) * | 2018-10-12 | 2018-12-28 | 深圳供电局有限公司 | Capacity estimation method for flexible direct current transmission system in urban power grid |
| CN111082439B (en) * | 2020-01-07 | 2021-07-09 | 南方电网科学研究院有限责任公司 | Power grid coordination stability control method, system and equipment |
| CN111355255B (en) * | 2020-02-20 | 2021-10-26 | 山东大学 | Virtual modulation-based DC overvoltage suppression method and system after lockout fault |
| CN113904318B (en) * | 2020-07-06 | 2024-04-05 | 南京南瑞继保电气有限公司 | Calculation and cut-off distribution method for emergency power surplus of direct-current power grid |
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