CN106712041B - 220kV collects the step voltage control method for coordinating up and down of substation - Google Patents

220kV collects the step voltage control method for coordinating up and down of substation Download PDF

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CN106712041B
CN106712041B CN201611150190.0A CN201611150190A CN106712041B CN 106712041 B CN106712041 B CN 106712041B CN 201611150190 A CN201611150190 A CN 201611150190A CN 106712041 B CN106712041 B CN 106712041B
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voltage
collection
substation
bus
renewable energy
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CN106712041A (en
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陆海
苏适
汤磊
严玉廷
廖小梦
杨家全
王志南
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Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention provides a kind of 220kV step voltage control method for coordinating up and down for collecting substation, comprising: obtains the current voltage value that i-th 220kV in area power grid collects the 110kV collection bus of substation, judges whether out-of-limit；If out-of-limit, calculate i-th 220kV collect substation 110kV collection bus institute band whole junior 110kV renewable energy stations to the voltage regulation capability of 110kV collection bus；Whether enough assess voltage regulation capability；If voltage regulation capability is enough, the voltage of 110kV collection bus is adjusted using junior 110kV renewable energy station；If voltage regulation capability is insufficient, the voltage of 110kV collection bus is adjusted using the reactive apparatus supplement that i-th 220kV collects substation.The method of the present invention can give full play to the Reactive-power control ability of renewable energy source station itself, avoid excessive capacitor or reactor cause to generate it is excessive idle.

Description

Upper and lower voltage coordination control method of 220kV collection substation
Technical Field
The invention relates to the technical field of voltage control of renewable energy convergence regions, in particular to a coordination control method for upper and lower voltage of a 220kV convergence substation.
Background
In recent years, the importance of clean energy is becoming more and more prominent under the influence of global warming and energy crisis, and renewable energy such as wind power generation and photovoltaic power generation is receiving wide attention from all countries in the world due to its huge development potential and relatively mature development technology, and is rapidly developed at an unprecedented speed.
As shown in figure 1, the renewable energy stations in China are all 110kV stations which are connected into a power grid through a 220kV transformer substation, the 220kV transformer substation is called a collection station, and the collection station and the 110kV renewable energy stations in the following area are called a new energy collection area. Due to the inherent intermittent characteristic of the renewable energy, the large-scale renewable energy grid connection brings great challenges to the operation and scheduling of the power grid. And because a renewable energy grid-connected region often lacks local loads, electric energy generated by renewable energy needs to be transmitted to a remote load center through a high-voltage-level and long transmission line, and the renewable energy transmission channels often lack a conventional hydroelectric power plant to perform active and reactive support, and the short-circuit capacity of the system is small, so that the change of the renewable energy capacity can cause large voltage fluctuation, especially the voltage fluctuation on a 110kV collection bus shown in fig. 1, and even large-scale interlocking grid disconnection can be caused in severe cases.
In the prior art, in order to avoid voltage fluctuation on a 110kV collection bus, a plurality of capacitors or reactors are arranged in a collection substation in a ground state, and the 110kV collection bus voltage is regulated through switching of the capacitors or reactors, but a large amount of excessive capacitors or reactors can cause generation of a large amount of excessive reactive power.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a coordinated control method for the upper and lower voltage of a 220kV convergence substation, which is characterized in that the voltage of a 110kV bus is regulated by preferentially utilizing the self reactive power regulation capability of a lower-level renewable energy source station, so that the self reactive power regulation capability of the renewable energy source station is fully exerted. When the reactive power regulation capability of the lower-level renewable energy source station is insufficient, the voltage of a bus collected by the renewable energy source station is ensured to be in an N-1 safety domain by switching a capacitor and a reactor in the upper-level 220kV collecting station. The upper and lower voltage coordination control method can fully exert the reactive power regulation capacity of the renewable energy source station in the ground state, replace a static capacitor or a reactor to exert the voltage support function, and avoid the generation of a large amount of excess reactive power in the fault disturbance process caused by excessive capacitors or reactors in the ground state.
According to an aspect of the embodiment of the invention, a coordinated control method for upper and lower voltages of a 220kV collection substation is provided, wherein the 220kV collection substation is connected with a lower 110kV renewable energy station through a 110kV collection bus, and the method comprises the following steps executed when a control cycle arrives: step S1, acquiring the current voltage value of a 110kV collection bus of an ith 220kV collection substation in a regional power grid, and judging whether the current voltage value is within a control upper and lower limit range, wherein i is a natural number, and i is more than or equal to 1 and less than or equal to the total number of 220kV collection substations in the regional power grid; step S2, if the current voltage value is within the control upper and lower limit ranges, making i equal to i +1, and returning to execute step S1; step S3, if the current voltage value exceeds the control upper and lower limit range, calculating the voltage regulation capability of all lower-level 110kV renewable energy source stations carried by the 110kV collecting bus of the ith 220kV collecting substation on the 110kV collecting bus; step S4, evaluating whether the voltage regulation capability of all lower-level 110kV renewable energy source stations is enough to regulate the voltage of the corresponding 110kV collection bus to be within the control upper and lower limit range; step S5, if the voltage regulation capability of all lower-level 110kV renewable energy source stations is enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the lower-level 110kV renewable energy source stations are used for regulating the voltage of the 110kV collection bus; step S6, if the voltage regulation capability of all the lower-level 110kV renewable energy source stations is not enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the voltage of the 110kV collection bus is regulated by using the reactive equipment of the ith 220kV collection substation in addition to the voltage of the 110kV collection bus regulated by using all the lower-level 110kV renewable energy source stations; in step S7, i is set to i +1, and step S1 is executed.
Preferably, the step S1 includes:
step S11, acquiring the current voltage value and the upper and lower control limit values of the 110kV collection bus of the ith 220kV collection substation in real time, wherein the current voltage value is recorded as Vi curThe lower limit value of control is recorded as Vi minThe upper limit of control is recorded as Vi max；
Step S12, checking the current voltage V of 110kV convergent busi curWhether the control is within the range of the upper limit and the lower limit of the control:
Vi min+Vi dead＜Vi cur＜Vi max-Vi dead (1)
wherein, Vi deadDetermining a dead zone threshold value for 110kV convergence bus voltage out-of-limit;
if the formula (1) is established, determining that the 110kV collection bus voltage of the ith 220kV collection substation is within the control upper and lower limit ranges; and if the above formula does not hold, determining that the 110kV collection bus voltage of the ith 220kV collection substation exceeds the control upper and lower limit range.
Preferably, step S3 includes:
step S31, receiving the increasable reactive power and the reducible reactive power sent by the jth lower level 110kV renewable energy source station in the ith 220kV collection substation in real time, and calculating the voltage increase and adjustment capacity of the jth lower level 110kV renewable energy source station to the corresponding 110kV collection bus according to the voltage sensitivity of the reactive power of the jth lower level 110kV renewable energy source station to the corresponding 110kV collection busAnd voltage reduction regulation capability
WhereinThe increasable reactive power and the decreasable reactive power are uploaded in real time for the jth lower-level 110kV renewable energy station in the ith 220kV collection substation,is a reactive pair of the jth lower-level 110kV renewable energy stationThe sensitivity of the 110kV collection bus to boost voltage,the sensitivity of the reactive power of the jth lower-level 110kV renewable energy station to the voltage drop of a 110kV convergence bus is shown, j is a natural number, j is more than or equal to 1 and less than or equal to the total number of lower-level 110kV renewable energy stations in the ith 220kV convergence substation;
step S32, return j to j +1, and execute step S31;
step S33, accumulating the voltage regulation capacity of all lower-level 110kV renewable energy source stations of the ith 220kV collecting substation to the 110kV collecting bus to obtain the voltage regulation capacity of all lower-level 110kV renewable energy source stations brought by the 110kV collecting bus of the ith 220kV collecting substation to the 110kV collecting bus:
preferably, step S4 includes:
step S41, evaluating whether the voltage reduction regulation capacity of all lower-level 110kV renewable energy source stations in the ith 220kV collection substation on the 110kV collection bus is sufficient:
if it is notIf the 110kV collection bus in the ith 220kV collection substation exceeds or is close to the upper limit and needs to be reduced in voltage, judging whether the following formula is satisfied:
Vi max-Vi cur＜Vi Down (4)
if the formula (4) is satisfied, judging that the voltage reduction regulation capability of all lower-level 110kV renewable energy source stations carried by the ith 220kV convergence substation is insufficient, requiring the coordination voltage reduction of reactive equipment of the ith 220kV convergence substation,
wherein: vi deadThreshold value, V, for 110kV collection bus voltage out-of-limit determinationi curFor 110kV collecting the current voltage value of the bus, Vi maxCollecting bus voltage control upper limit value, V, for 110kVi DownThe voltage of all 110kV renewable energy source stations in the ith 220kV collection substation is reduced and adjusted;
step S42, evaluating whether the voltage increase and regulation capacity of all lower-level 110kV renewable energy source stations in the ith 220kV collection substation on the 110kV collection bus is sufficient:
if it is notIf the 110kV collection bus in the ith 220kV collection substation already or nearly crosses the lower limit and needs to be boosted, judging whether the following formula is satisfied:
Vi min-Vi cur＞Vi Up (5)
if the formula (5) is satisfied, judging that the voltage increase and regulation capacity of all lower-level 110kV renewable energy source stations carried by the ith 220kV convergence substation is insufficient, requiring the coordination voltage increase of reactive equipment of the ith 220kV convergence substation,
wherein: vi deadThreshold value, V, for 110kV collection bus voltage out-of-limit determinationi curFor 110kV collecting the current voltage value of the bus, Vi minCollecting the lower limit value of the bus voltage control, V, for 110kVi UpAnd the regulation capacity is added for all 110kV renewable energy source stations in the ith 220kV collection substation to the voltage of the 110kV collection bus.
Preferably, step S6 includes:
step S61, if the step S41 determines that the reactive equipment of the ith 220kV collection substation is required to be coordinately reduced in voltage, then: if a capacitor which runs is arranged on the low-voltage side of a main transformer of the ith 220kV convergence substation, one reactor is cut off; otherwise, putting a reactor;
step S62, if the step S42 determines that the reactive equipment of the ith 220kV collection substation needs to be boosted in a coordinated manner, then: if the low-voltage side of the main transformer of the ith 220kV convergence transformer substation is provided with an operating reactor, cutting off one reactor; otherwise, a capacitor is put in.
Preferably, the lower 110kV renewable energy station is a wind power station or a photovoltaic power station.
Preferably, every 5 minutes is a control period.
As described above, the present invention provides a coordinated control method for upper and lower voltages of a 220kV collection substation, wherein the 220kV collection substation is connected to a lower 110kV renewable energy station through a 110kV collection bus, and the method includes the following steps executed when a control cycle arrives: step S1, acquiring the current voltage value of a 110kV collection bus of an ith 220kV collection substation in a regional power grid, and judging whether the current voltage value is within a control upper and lower limit range, wherein i is a natural number, and i is more than or equal to 1 and less than or equal to the total number of 220kV collection substations in the regional power grid; step S2, if the current voltage value is within the control upper and lower limit ranges, making i equal to i +1, and returning to execute step S1; step S3, if the current voltage value exceeds the control upper and lower limit range, calculating the voltage regulation capability of all lower-level 110kV renewable energy source stations carried by the 110kV collecting bus of the ith 220kV collecting substation on the 110kV collecting bus; step S4, evaluating whether the voltage regulation capability of all lower-level 110kV renewable energy source stations is enough to regulate the voltage of the corresponding 110kV collection bus to be within the control upper and lower limit range; step S5, if the voltage regulation capability of all lower-level 110kV renewable energy source stations is enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the lower-level 110kV renewable energy source stations are used for regulating the voltage of the 110kV collection bus; step S6, if the voltage regulation capability of all the lower-level 110kV renewable energy source stations is not enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the voltage of the 110kV collection bus is regulated by using the reactive equipment of the ith 220kV collection substation in addition to the voltage of the 110kV collection bus regulated by using all the lower-level 110kV renewable energy source stations; in step S7, i is set to i +1, and step S1 is executed. According to the coordinated control method for the upper and lower voltage of the 220kV convergence substation, the voltage of the 110kV bus is adjusted by preferentially utilizing the reactive power adjusting capability of the lower-level renewable energy source station, so that the reactive power adjusting capability of the renewable energy source station is fully exerted. When the reactive power regulation capability of the new energy collection area is insufficient, the voltage of the bus of the renewable energy station is ensured to be in an N-1 safety area by switching a capacitor and a reactor in the 220kV collection station. The upper and lower voltage coordination control method can fully exert the reactive power regulation capacity of the renewable energy source station in the ground state, replace a static capacitor or a reactor to exert the voltage support function, and avoid the generation of a large amount of excess reactive power in the fault disturbance process caused by excessive capacitors or reactors in the ground state. Therefore, the invention realizes the reactive voltage coordination control of the upper-level 220kV collecting transformer substation and the lower-level 110kV renewable energy station, when the voltage regulation capability of the lower-level 110kV renewable energy station on the 110kV bus voltage is insufficient, the voltage of the renewable energy station bus is ensured in an N-1 safety domain by switching the capacitor and the reactor of the transformer substation, the linkage disconnection of the renewable energy station caused by the voltage drop of the renewable energy is avoided, and the voltage stability and the voltage quality of a power grid are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a new energy collection area power grid architecture;
fig. 2 is a schematic flow chart of a coordinated control method for upper and lower voltages of a 220kV collection substation according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Generally, a regional power grid new energy collection area generally includes a 220kV collection substation and a plurality of lower 110kV renewable energy stations, the lower 110kV renewable energy stations are connected to a power grid through the 220kV collection substation, and a 110kV collection bus of the 220kV collection substation is connected to the lower 110kV renewable energy stations. In the voltage coordination control of a new energy convergence area, in order to avoid large-scale chain off-line caused by voltage, the reactive power regulation capability of a renewable energy source station per se is fully exerted in a ground state so as to replace static capacitors to exert a voltage support effect, and a large amount of excessive reactive power generated in a fault disturbance process due to excessive input of capacitors in the ground state is avoided. Therefore, in the present invention, the reactive voltage coordination principle of the renewable energy station and the substation of the collection station is as follows:
1. the reactive power regulation capability of the renewable energy station is preferentially used in the ground state.
When the renewable energy source stations in the new energy collection area have reactive power regulation capacity, the reactive power regulation capacity of the renewable energy source stations is preferentially used, and the voltage limit value of the collection substation adopts a planned limit value, so that the bus voltage of the renewable energy source stations is in an N-1 safety domain.
2. And when the reactive power regulation capability of the new energy collection region is insufficient, the voltage regulation of the new energy collection region is carried out by using the low-voltage side reactive power equipment in the collection station.
When the reactive power regulation capability of the renewable energy source station is insufficient and the renewable energy source station cannot be located in the N-1 safety domain, the voltage of the bus of the renewable energy source station is ensured to be located in the N-1 safety domain by switching the capacitor and the reactor in the 220kV collecting station.
In order to realize the reactive voltage coordination control principle of the 220kV collecting station and the lower-level 110kV renewable energy station, the invention provides and realizes a coordination control method. As shown in fig. 2, the coordinated control method for the upper and lower voltage levels of the 220kV collection substation includes the following steps executed when a control period (one control period every 5 minutes) comes:
and step S1, acquiring the current voltage value of a 110kV collection bus of the ith 220kV collection substation in the regional power grid, and judging whether the current voltage value is within the control upper and lower limit ranges, wherein i is a natural number, and i is more than or equal to 1 and less than or equal to the total number of the 220kV collection substations in the regional power grid.
In step S2, if the current voltage value is within the control upper and lower limit ranges, i is made to be i +1, and the process returns to step S1, that is, the current voltage value of the 110kV collection bus of the next 220kV collection substation is obtained.
And step S3, if the current voltage value exceeds the control upper and lower limit range, calculating the voltage regulation capability of all lower-level 110kV renewable energy source stations carried by the 110kV collecting bus of the ith 220kV collecting substation on the 110kV collecting bus.
And step S4, evaluating whether the voltage regulation capability of all the lower-level 110kV renewable energy stations is enough to regulate the voltage of the corresponding 110kV collection bus to be within the control upper and lower limit ranges.
And step S5, if the voltage regulation capability of all the lower-level 110kV renewable energy source stations is enough to regulate the voltage of the 110kV collection bus to be within the upper and lower control limits, the lower-level 110kV renewable energy source stations are used for regulating the voltage of the 110kV collection bus.
Step S6, if the voltage regulation capability of all the lower-level 110kV renewable energy stations is not enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the voltage of the 110kV collection bus is supplementarily regulated by using the reactive equipment of the ith 220kV collection substation in addition to the voltage of the 110kV collection bus regulated by using all the lower-level 110kV renewable energy stations.
In step S7, i is set to i +1, and step S1 is executed. That is, the voltage coordination control is performed on the next 220kV collection substation.
According to an embodiment of the invention, the lower 110kV renewable energy station may be a wind power station or a photovoltaic power station.
According to an embodiment of the present invention, the step S1 may specifically include:
step S11, obtaining the current voltage value and the control upper and lower limit ranges of the 110kV collection bus of the ith 220kV collection substation in real time, wherein the current voltage value is recorded as Vi curThe lower limit value of control is recorded as Vi minThe upper limit of control is recorded as Vi max。
Step S12, checking the current voltage V of 110kV convergent busi curWhether the control is within the range of the upper limit and the lower limit of the control:
Vi min+Vi dead＜Vi cur＜Vi max-Vi dead (1)
wherein, Vi deadAnd determining a dead zone threshold value for 110kV convergence bus voltage out-of-limit.
If the formula (1) is established, determining that the 110kV collection bus voltage of the ith 220kV collection substation is within the control upper and lower limit ranges; and if the above formula does not hold, determining that the 110kV collection bus voltage of the ith 220kV collection substation exceeds the control upper and lower limit range.
According to an embodiment of the present invention, the step S3 may specifically include:
step S31, receiving the increasable reactive power and the reducible reactive power sent by the jth lower level 110kV renewable energy source station in the ith 220kV collection substation in real time, and calculating the voltage increase and adjustment capacity of the jth lower level 110kV renewable energy source station to the corresponding 110kV collection bus according to the voltage sensitivity of the reactive power of the jth lower level 110kV renewable energy source station to the corresponding 110kV collection busAnd voltage reduction regulation capability
WhereinThe increasable reactive power and the decreasable reactive power are uploaded in real time for the jth lower-level 110kV renewable energy station in the ith 220kV collection substation,is a stand forThe sensitivity of the reactive power of the jth lower-level 110kV renewable energy station to the boosted voltage of the 110kV collection bus,the sensitivity of the reactive power of the jth lower-level 110kV renewable energy station to the voltage drop of the 110kV collecting bus is shown, j is a natural number, and j is more than or equal to 1 and less than or equal to the total number of the lower-level 110kV renewable energy stations in the ith 220kV collecting substation.
In step S32, j is changed to j +1, and the process returns to step S31. That is, the increasable reactive power and the decreasable reactive power of the next lower stage 110kV renewable energy station in the ith 220kV collection substation are received.
Step S33, accumulating the voltage regulation capacity of all lower-level 110kV renewable energy source stations of the ith 220kV collecting substation to the 110kV collecting bus to obtain the voltage regulation capacity of all lower-level 110kV renewable energy source stations brought by the 110kV collecting bus of the ith 220kV collecting substation to the 110kV collecting bus:
according to an embodiment of the present invention, the step S4 may specifically include:
step S41, evaluating whether the voltage reduction regulation capacity of all lower-level 110kV renewable energy source stations in the ith 220kV collection substation on the 110kV collection bus is sufficient:
if it is notIf the 110kV collection bus in the ith 220kV collection substation exceeds or is close to the upper limit and needs to be reduced in voltage, judging whether the following formula is satisfied:
Vi max-Vi cur＜Vi Down (4)
if the formula (4) is satisfied, judging that the voltage reduction regulation capability of all lower-level 110kV renewable energy source stations carried by the ith 220kV convergence substation is insufficient, requiring the coordination voltage reduction of reactive equipment of the ith 220kV convergence substation,
wherein: vi deadThreshold value, V, for 110kV collection bus voltage out-of-limit determinationi curFor 110kV collecting the current voltage value of the bus, Vi maxCollecting bus voltage control upper limit value, V, for 110kVi DownAnd reducing and regulating the voltage of the 110kV collection bus for all 110kV renewable energy source stations in the ith 220kV collection substation.
Step S42, evaluating whether the voltage increase and regulation capacity of all lower-level 110kV renewable energy source stations in the ith 220kV collection substation on the 110kV collection bus is sufficient:
if Vi cur＜Vi min+Vi deadIf the 110kV collection bus in the ith 220kV collection substation already or nearly crosses the lower limit and needs to be boosted, judging whether the following formula is satisfied:
Vi min-Vi cur＞Vi Up (5)
if the formula (5) is satisfied, judging that the voltage increase and regulation capacity of all lower-level 110kV renewable energy source stations carried by the ith 220kV convergence substation is insufficient, requiring the coordination voltage increase of reactive equipment of the ith 220kV convergence substation,
wherein: vi deadThreshold value, V, for 110kV collection bus voltage out-of-limit determinationi curFor 110kV collecting the current voltage value of the bus, Vi minCollecting the lower limit value of the bus voltage control, V, for 110kVi UpAnd the regulation capacity is added for all 110kV renewable energy source stations in the ith 220kV collection substation to the voltage of the 110kV collection bus.
According to an embodiment of the present invention, the step S6 may specifically include:
step S61, if the step S41 determines that the reactive equipment of the ith 220kV collection substation is required to be coordinately reduced in voltage, then: if the low-voltage side of the main transformer of the ith 220kV convergence substation is provided with a running capacitor, cutting off one capacitor; otherwise, a reactor is put into the reactor.
Step S62, if the step S42 determines that the reactive equipment of the ith 220kV collection substation needs to be boosted in a coordinated manner, then: if the low-voltage side of the main transformer of the ith 220kV convergence transformer substation is provided with an operating reactor, cutting off one reactor; otherwise, a capacitor is put in.
The method for coordinated control of the upper and lower voltage levels of the 220kV collection substation according to the present invention is described below by way of example with reference to fig. 1. Fig. 1 is a schematic diagram of a new energy collection area power grid architecture of a regional power grid. As shown in fig. 1, the regional power grid new energy collection area includes a 220kV collection substation and three lower-level 110kV wind power stations B, 110kV wind power stations C and 110kV photovoltaic stations D, the three lower-level 110kV renewable energy stations are connected to the power grid through the 220kV collection substation, and a 110kV collection bus of the 220kV collection substation is connected to the three lower-level 110kV renewable energy stations. An SVC (Static Var Compensator) is provided in each renewable energy station.
For the regional power grid shown in fig. 1, the voltage coordination control method for the 220kV collection station and the lower-level 110kV renewable energy station of the present invention executes the following steps when a control period (one control period every 5 minutes) comes:
the method comprises the following steps of firstly, setting a control period T in advance, wherein the current voltage of a 110kV collecting bus of a 220kV collecting station is 117.62kV, the control upper limit value is 117.50kV, and the control lower limit value is 110.70kV, and specifically comprises the following steps:
when each control period T (one control period every 5 minutes) comes, the following steps are performed:
1) the voltage condition of a 110kV collection bus in a 220kV collection station of the ith renewable energy station in the regional power grid is checked, and the following calculation is carried out:
1-1) acquiring the current voltage value of a 110kV collecting bus in real time and controlling the upper and lower limit values, wherein the current voltage value is recorded as Vi curThe lower limit value of control is recorded as Vi minThe upper limit of control is recorded as Vi max. Wherein, Vi cur＝117.62kV，Vi max＝117.50kV，Vi min＝110.70kV，Vi dead＝0.5kV；
1-2) checking the current voltage V of the 110kV collection busi curWhether the control is within the range of the upper limit and the lower limit of the control:
due to Vi cur>Vi max-Vi deadThe 110kV collection bus voltage of the 110kV renewable energy station is over the upper limit, and the next step 2) is carried out;
2) the following calculation is carried out on a lower-level 110kV renewable energy station carried by a 110kV collection bus of a 220kV collection station:
2-1) receiving the increasable reactive power and the reducible reactive power transmitted by the wind power plant B, C and the photovoltaic station D in the collection area in real time, and calculating the voltage increase and decrease regulation capacity of the renewable energy station to the 110kV collection bus according to the voltage sensitivity of the reactive power of the renewable energy station to the 110kV collection bus.
Wind power plant B:
upward adjustable voltage:
downward adjustable voltage:
wind power plant C:
upward adjustable voltage:
downward adjustable voltage:
photovoltaic station D:
upward adjustable voltage:
downward adjustable voltage:
2-2) integrating the voltage regulation capacity of the wind farm B, C and the photovoltaic plant D into the total voltage regulation capacity of the collection area:
Vi Up＝0.0，Vi Down＝0.0。
3) evaluating the voltage regulation capability of a renewable energy station in a 220kV collection station on a 110kV collection bus in the collection station, wherein the method comprises the following steps:
3-1) Current Vi cur＝117.62kV，Vi max117.50kV, getCurrent Vi cur＞Vi max-Vi dead(117.62>117.50-0.50), the upper limit of the 110kV collection bus voltage is exceeded;
ΔVi＝Vi max-Vi cur＝-0.12，ΔVi＜Vi Down(-0.12<0.0), the voltage reduction and regulation capacity of the renewable energy station in the 220kV collection station is judged to be insufficient, and the voltage reduction needs to be coordinated.
4) And calculating a reactive equipment switching strategy of the 220kV collection substation according to the evaluation result of the voltage regulation capability of the renewable energy station in the 220kV collection station in the step 3).
4-1) judging that the coordination voltage reduction is needed currently through 3-1), and if a capacitor which runs is arranged on the low-voltage side of a main transformer of the 220kV collecting station, cutting off one capacitor; otherwise, a reactor is put into the reactor.
5) And returning to the step 1), continuously processing the 220kV collecting substation of the next renewable energy station until the processing of the 220kV collecting substations of all the renewable energy stations in the power grid is completed.
In summary, according to the coordinated control method for the upper and lower voltages of the 220kV collection substation, the voltage of the 110kV bus is adjusted by preferentially utilizing the reactive power adjusting capability of the lower renewable energy station, so that the reactive power adjusting capability of the renewable energy station is fully exerted. When the reactive power regulation capability of the new energy collection area is insufficient, the voltage of the bus of the renewable energy station is ensured to be in an N-1 safety area by switching a capacitor and a reactor in the 220kV collection station. The upper and lower voltage coordination control method can fully exert the reactive power regulation capacity of the renewable energy source station in the ground state, replace a static capacitor or a reactor to exert the voltage support function, and avoid the generation of a large amount of excess reactive power in the fault disturbance process caused by excessive capacitors or reactors in the ground state. Therefore, the invention realizes the reactive voltage coordination control of the upper-level 220kV collecting transformer substation and the lower-level 110kV renewable energy source station, the voltage of the 110kV collecting bus is regulated by preferentially utilizing the self reactive regulation capability of the lower-level renewable energy source station, when the voltage regulation capability of the lower-level 110kV renewable energy source station on the voltage of the 110kV collecting bus is insufficient, the capacitor and the reactor of the upper-level transformer substation are switched to ensure that the voltage of the collecting bus of the renewable energy source station is in an N-1 safety domain, the linkage disconnection of the renewable energy source station caused by the voltage drop of the renewable energy source station is avoided, and the voltage stability and the voltage quality of a power grid are improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (6)

1. A coordinated control method for upper and lower voltage of a 220kV convergence substation is characterized in that the 220kV convergence substation is connected with a lower 110kV renewable energy station through a 110kV convergence bus, and the method comprises the following steps of:
step S1, acquiring the current voltage value of a 110kV collection bus of an ith 220kV collection substation in a regional power grid, and judging whether the current voltage value is within a control upper and lower limit range, wherein i is a natural number, and i is more than or equal to 1 and less than or equal to the total number of 220kV collection substations in the regional power grid;
step S2, if the current voltage value is within the control upper and lower limit ranges, making i equal to i +1, and returning to execute step S1;
step S3, if the current voltage value exceeds the upper and lower control limit ranges, calculating the voltage regulation capability of all lower-level 110kV renewable energy source stations carried by the 110kV collection bus of the ith 220kV collection substation on the 110kV collection bus, wherein the step S3 includes:
step S31, receiving the increasable reactive power and the reducible reactive power sent by the jth lower level 110kV renewable energy source station in the ith 220kV collection substation in real time, and calculating the voltage increase and adjustment capacity of the jth lower level 110kV renewable energy source station to the corresponding 110kV collection bus according to the voltage sensitivity of the reactive power of the jth lower level 110kV renewable energy source station to the corresponding 110kV collection busAnd voltage reduction regulation capability
WhereinThe increasable reactive power and the decreasable reactive power are uploaded in real time for the jth lower-level 110kV renewable energy station in the ith 220kV collection substation,sensitivity of the reactive power of the jth lower stage 110kV renewable energy station to 110kV collection bus boosting,being said jth lower stage 110kV renewable energy stationThe sensitivity of reactive power to the voltage drop of the 110kV convergence bus, j is a natural number, j is more than or equal to 1 and less than or equal to the total number of lower-level 110kV renewable energy source stations in the ith 220kV convergence substation;
step S32, return j to j +1, and execute step S31;
step S33, accumulating the voltage regulation capacity of all lower-level 110kV renewable energy source stations of the ith 220kV collecting substation to the 110kV collecting bus to obtain the voltage regulation capacity of all lower-level 110kV renewable energy source stations brought by the 110kV collecting bus of the ith 220kV collecting substation to the 110kV collecting bus:
step S4, evaluating whether the voltage regulation capability of all lower-level 110kV renewable energy source stations is enough to regulate the voltage of the corresponding 110kV collection bus to be within the control upper and lower limit range;
step S5, if the voltage regulation capability of all lower-level 110kV renewable energy source stations is enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the lower-level 110kV renewable energy source stations are used for regulating the voltage of the 110kV collection bus;
step S6, if the voltage regulation capability of all the lower-level 110kV renewable energy source stations is not enough to regulate the voltage of the 110kV collection bus to be within the control upper and lower limits, the voltage of the 110kV collection bus is regulated by using the reactive equipment of the ith 220kV collection substation in addition to the voltage of the 110kV collection bus regulated by using all the lower-level 110kV renewable energy source stations;
in step S7, i is set to i +1, and step S1 is executed.
2. The coordinated control method for upper and lower voltage of a 220kV convergence substation according to claim 1, wherein the step S1 comprises:
step S11, obtaining the current voltage value and the upper and lower control limit values of the 110kV collection bus of the ith 220kV collection substation in real time, wherein the current voltage value and the upper and lower control limit values are obtained when the current voltage value is greater than the upper and lower control limit valuesFront voltage value is recorded asThe lower limit of control is recorded asThe control upper limit value is recorded as
Step S12, checking the current voltage of 110kV collection busWhether the control is within the range of the upper limit and the lower limit of the control:
Vi min+Vi dead＜Vi cur＜Vi max-Vi dead (1)
wherein,determining a dead zone threshold value for 110kV convergence bus voltage out-of-limit;
if the formula (1) is established, determining that the 110kV collection bus voltage of the ith 220kV collection substation is within the control upper and lower limit ranges; and if the above formula does not hold, determining that the 110kV collection bus voltage of the ith 220kV collection substation exceeds the control upper and lower limit range.
3. The coordinated control method for upper and lower voltage of a 220kV convergence substation according to claim 1, wherein the step S4 comprises:
step S41, evaluating whether the voltage reduction regulation capacity of all lower-level 110kV renewable energy source stations in the ith 220kV collection substation on the 110kV collection bus is sufficient:
if it is notIf the 110kV collection bus in the ith 220kV collection substation exceeds or is close to the upper limit and needs to be reduced in voltage, judging whether the following formula is satisfied:
Vi max-Vi cur＜Vi Down (4)
if the formula (4) is satisfied, judging that the voltage reduction regulation capability of all lower-level 110kV renewable energy source stations carried by the ith 220kV convergence substation is insufficient, requiring the coordination voltage reduction of reactive equipment of the ith 220kV convergence substation,
wherein:the threshold value is determined for 110kV convergence bus voltage out-of-limit,the present voltage value of the bus is collected for 110kV,the bus voltage control upper limit value is pooled for 110kV,the voltage of all lower-level 110kV renewable energy source stations in the ith 220kV convergence substation is reduced and adjusted;
step S42, evaluating whether the voltage increase and regulation capacity of all lower-level 110kV renewable energy source stations in the ith 220kV collection substation on the 110kV collection bus is sufficient:
if it is notIf the control bus needs to be boosted when the control bus is close to or exceeds the lower limit, judging whether the following formula is satisfied:
if the formula (5) is satisfied, judging that the voltage increase and regulation capacity of all lower-level 110kV renewable energy source stations carried by the ith 220kV convergence substation is insufficient, requiring the coordination voltage increase of reactive equipment of the ith 220kV convergence substation,
wherein:the threshold value is determined for 110kV convergence bus voltage out-of-limit,the present voltage value of the bus is collected for 110kV,the lower limit value for the 110kV collection bus voltage control,and the regulation capacity is added for all lower-level 110kV renewable energy source stations in the ith 220kV collection substation to the voltage of the 110kV collection bus.
4. The coordinated control method for upper and lower voltage of a 220kV convergence substation according to claim 1, wherein the step S6 comprises:
step S61, if the step S41 determines that the reactive equipment of the ith 220kV collection substation is required to be coordinately reduced in voltage, then: if the low-voltage side of the main transformer of the ith 220kV convergence substation is provided with a running capacitor, cutting off one capacitor; otherwise, putting a reactor;
step S62, if the step S42 determines that the reactive equipment of the ith 220kV collection substation needs to be boosted in a coordinated manner, then: if the low-voltage side of the main transformer of the ith 220kV convergence transformer substation is provided with an operating reactor, cutting off one reactor; otherwise, a capacitor is put in.
5. The upper and lower level voltage coordination control method of the 220kV collection substation of claim 1, wherein the lower level 110kV renewable energy station is a wind power station or a photovoltaic power station.
6. The coordinated control method for upper and lower voltage of a 220kV convergence substation according to claim 1, wherein every 5 minutes is a control period.
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CN104579165A (en) * 2015-01-22 2015-04-29 国家电网公司 Photovoltaic power station dynamic reactive response performance site testing method
CN105140964A (en) * 2015-09-24 2015-12-09 中国南方电网有限责任公司 10kV power distribution network power coordination control method with photovoltaic power supply
CN105914797A (en) * 2015-12-24 2016-08-31 国网甘肃省电力公司电力科学研究院 Large-scale photovoltaic power station reactive voltage sequential coordination control technology

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104579165A (en) * 2015-01-22 2015-04-29 国家电网公司 Photovoltaic power station dynamic reactive response performance site testing method
CN105140964A (en) * 2015-09-24 2015-12-09 中国南方电网有限责任公司 10kV power distribution network power coordination control method with photovoltaic power supply
CN105914797A (en) * 2015-12-24 2016-08-31 国网甘肃省电力公司电力科学研究院 Large-scale photovoltaic power station reactive voltage sequential coordination control technology

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