CN106532729B - It saves ground and coordinates the method that control 220kV collects substation's high voltage bus voltage - Google Patents
It saves ground and coordinates the method that control 220kV collects substation's high voltage bus voltage Download PDFInfo
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Abstract
The present invention coordinates to control the method that 220kV collects substation's high voltage bus voltage about a kind of province, including：In saving tune control system, the 220kV for obtaining j-th of regenerative resource station collection region collects the voltage regulatory demand amount of substation's high voltage bus；Calculate the total voltage regulating power of 220kV regenerative resources station whole in j-th of regenerative resource station collection region；Whether enough assess total voltage regulating power；If total voltage regulating power is insufficient, calculates 220kV and coordinate critical point reactive requirement limits with collecting corresponding province of substation；It saves and control system is adjusted to adjust limits in control system with being issued to, the 220kV of ground tune control system control reactive apparatus supplement j-th of regenerative resource station collection region of adjusting collects the voltage of substation's high voltage bus.This method can coordinate control 220kV and collect substation's high voltage bus voltage with effectively realizing province.
Description
Technical Field
The invention relates to the technical field of voltage control of renewable energy convergence regions, in particular to a method for provincial and local coordinated control of 220kV convergence substation high-voltage bus voltage.
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.
In a renewable energy grid-connected region, a plurality of 220kV renewable energy field stations (such as wind power stations) and 110kV wind power stations are connected into a power grid through a 220kV transformer substation, the 220kV transformer substation is generally called a wind power collection transformer substation, the wind power collection transformer substation and all the wind power stations carried by the wind power collection transformer substation are called a wind power collection region, and a typical region is shown in fig. 1. As shown in fig. 1, the wind power stations B and C on the high-Voltage side of the 220kV collection substation are controlled by a provincial Voltage Control (AVC) system, and the 220kV collection substation is controlled by a local AVC system.
China power grids are interconnected into a whole, a traditional AVC system independently controls all levels of power grids, the control objects of the AVC system are only local to the whole power system, and coordination from the perspective of a global power grid is lacked. Referring to fig. 1, in the prior art, an AVC system with a provincial dispatching and an AVC system with a local dispatching are isolated in control, and there is no coordination control between the systems, and any local control will affect the state of the global power grid, especially for some power systems with a relatively close relationship, if only independent control is performed, control oscillation may occur on the boundaries of both parties or the control effect may be reduced from the perspective of the global power grid, which is not favorable for the stability and quality of the power grid voltage.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a method for provincial and local two-stage coordination control of 220kV convergence substation high-voltage bus voltage. The method can effectively realize the reactive voltage coordination control of the 220kV renewable energy station and the 220kV renewable energy convergence substation, when the reactive power regulation capability of the renewable energy station is sufficient, the voltage is regulated by preferentially using the self reactive power of the renewable energy station, and the reactive power regulation in the 220kV renewable energy convergence substation is avoided by too many capacitors or reactors; when the reactive power regulation capability of the renewable energy station is insufficient, the local dispatching AVC is timely put into or cut off reactive power equipment (such as a capacitor or a reactor) in a 220kV renewable energy collection substation through real-time information exchange between the provincial and local two-stage AVC systems, so that the bus voltage of the renewable energy collection region is in a normal range, and the voltage stability and the voltage quality of a power grid of the renewable energy collection region are improved.
According to a first aspect of the embodiments of the present invention, there is provided a method for provincially and locally coordinately controlling a high-voltage bus voltage of a 220kV convergence substation, in each convergence area of the renewable energy substations, a plurality of 220kV renewable energy substations are connected to a power grid through one 220kV convergence substation, each 220kV renewable energy substation is controlled by a provincial dispatching automatic voltage control system, each 220kV convergence substation is controlled by a local dispatching automatic voltage control system, and when a control cycle comes, the following steps are performed: step S1, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus in a jth renewable energy station collection area in a provincial regulation automatic voltage control system, wherein 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 renewable energy station collection areas in a preset area; step S2, calculating the total voltage regulation capacity of all 220kV renewable energy stations in the jth renewable energy station gathering area; step S3, evaluating whether the total voltage regulation capability satisfies the voltage regulation demand; step S4, if the total voltage regulation capacity is enough to regulate the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area, the voltage regulation capacity of the 220kV renewable energy station is used for regulating the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area; step S5, if the total voltage regulation capacity is not enough to regulate the voltage of a high-voltage bus of a 220kV collection substation in a collection area of a jth renewable energy station, calculating a provincial and local coordination gateway reactive power demand limit range corresponding to the 220kV collection substation; step S6, the provincial dispatching automatic voltage control system issues the limit value range to a local dispatching automatic voltage control system, the local dispatching automatic voltage control system controls reactive equipment in a 220kV convergence substation in a jth renewable energy station convergence region, so that the reactive equipment supplements and adjusts the voltage of the 220kV convergence substation high-voltage bus in the jth renewable energy station convergence region except that the total voltage adjusting capacity in the step S2 is used for adjusting the voltage of the 220kV convergence substation high-voltage bus in the jth renewable energy station convergence region; in step S7, j is changed to j +1, and the process returns to step S1.
Preferably, step S1 includes:
in a provincial dispatching automatic voltage control system, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus in a collection area of a jth renewable energy station in a power grid, namely:
wherein:in order to obtain a control target value of a high-voltage bus of a 220kV collection substation through global optimization calculation in the automatic voltage control system of the provincial power grid,is the actual value of the bus voltage,the demand is regulated for the bus voltage.
Preferably, step S2 includes:
step S21, receiving the increasable reactive power and the reducible reactive power sent by the ith 220kV renewable energy station in the jth renewable energy station convergence area in real time, and calculating the voltage increase and decrease adjusting capability of the ith 220kV renewable energy station to the 220kV convergence substation high-voltage bus according to the reactive voltage sensitivity of the ith 220kV renewable energy station to the 220kV convergence substation high-voltage bus:
whereinThe method comprises the steps that increased reactive power and decreased reactive power are sent to an ith 220kV renewable energy station in a jth renewable energy station gathering area in real time, 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 renewable energy stations in the jth renewable energy station gathering area;
step S22, return to step S21 with i equal to i + 1;
step S23, accumulating the voltage increase and decrease adjustment capacities of all 220kV renewable energy stations in the jth renewable energy station gathering area:
preferably, step S3 includes:
step S31, ifThen checking and judging:
if equation (4) is true, it is determined that the total voltage increase regulation capability of all 220kV renewable energy stations in the jth renewable energy station concentration area is insufficient, wherein,taking 0.5-1.0kV as a threshold value for voltage regulation; rpTaking 0.5-0.7 of a threshold value for the coordinated control of the renewable energy source station and the transformer substation;
step S32, ifThen checking and judging:
if equation (5) holds, it is determined that the total voltage reduction regulation capability of all 220kV renewable energy stations in the jth renewable energy station concentration area is insufficient, wherein,taking 0.5-1.0kV as a threshold value for regulating the voltage of a high-voltage bus of the current coordinated substation; rpAnd taking 0.5-0.7 as a renewable energy source station and a transformer substation coordination control threshold value.
Preferably, step S5 includes:
step S51, initializing a reactive power demand limit range of a provincial and local coordination gateway corresponding to the 220kV convergence substation as follows:
wherein:to coordinate the current reactive value of the gateway conservatively,taking 20-30Mvar for provincial and local coordination gateway reactive power regulation dead zone parameter values;
step S52, ifAnd in step S301, it is determined that the total voltage increase and regulation capacity of all 220kV renewable energy stations in the jth renewable energy station convergence area is insufficient, and the reactive power coordination control regulation demand of the 220kV convergence substation is calculated as follows:
whereinThe reactive injection voltage sensitivity of a 220kV collection substation high-voltage bus in a jth renewable energy station collection area is obtained; according to the calculation result, adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV convergence substation to be:
wherein,for the reactive power increase and regulation capacity of a provincial and local coordination gateway corresponding to a 220kV convergence substation which is uploaded to local dispatching AVC, the reactive power requirement limit value of the provincial and local coordination gateway corresponding to the 220kV convergence substation is updated to be as follows:
step S53, ifAnd in step S302, it is determined that the total voltage reduction regulation capability of all 220kV renewable energy stations in the jth renewable energy station convergence area is insufficient, and the reactive coordination control regulation requirement of the 220kV convergence substation is calculated as follows:
whereinThe reactive injection voltage sensitivity of a high-voltage bus of a 220kV collection substation in the electric collection area of the jth renewable energy station is obtained; according to the calculation result, adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV convergence substation to be:
wherein,for the reactive power reduction regulation capacity of the provincial and local coordination gateway corresponding to the 220kV convergence substation which is uploaded to the local dispatching AVC, the reactive power requirement limit value of the provincial and local coordination gateway corresponding to the 220kV convergence substation is updated to be as follows:
the corrected limit value range is adjusted by the provincial dispatching automatic voltage control systemAnd sending the voltage to a local dispatching automatic voltage control system, wherein the local dispatching automatic voltage control system collects reactive equipment in a transformer substation by controlling 220kV, so that the voltage regulation capacity of the reactive equipment and the total voltage regulation capacity in the step S2 meet the voltage regulation demand.
Preferably, the renewable energy station may be a wind power plant or a photovoltaic power plant.
Preferably, every 5 minutes is a control period.
In summary, a method for provincially and locally coordinated control of high-voltage bus voltage of 220kV collection substations is provided, in each collection area of renewable energy stations, a plurality of 220kV renewable energy stations are connected to a power grid through a 220kV collection substation, the 220kV renewable energy stations are controlled by a provincial dispatching automatic voltage control system, the 220kV collection substation is controlled by a local dispatching automatic voltage control system, and when a control cycle comes, the following steps are executed: step S1, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus in a jth renewable energy station collection area in a provincial regulation automatic voltage control system, wherein 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 renewable energy station collection areas in a preset area; step S2, calculating the total voltage regulation capacity of all 220kV renewable energy stations in the jth renewable energy station gathering area; step S3, evaluating whether the total voltage regulation capability satisfies the voltage regulation demand; step S4, if the total voltage regulation capacity is enough to regulate the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area, the voltage regulation capacity of the 220kV renewable energy station is used for regulating the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area; step S5, if the total voltage regulation capacity is not enough to regulate the voltage of a high-voltage bus of a 220kV collection substation in a collection area of a jth renewable energy station, calculating a provincial and local coordination gateway reactive power demand limit range corresponding to the 220kV collection substation; step S6, the provincial dispatching automatic voltage control system issues the limit value range to a local dispatching automatic voltage control system, the local dispatching automatic voltage control system controls reactive equipment in a 220kV convergence substation in a jth renewable energy station convergence region, so that the reactive equipment supplements and adjusts the voltage of the 220kV convergence substation high-voltage bus in the jth renewable energy station convergence region except that the total voltage adjusting capacity in the step S2 is used for adjusting the voltage of the 220kV convergence substation high-voltage bus in the jth renewable energy station convergence region; in step S7, j is changed to j +1, and the process returns to step S1. The method can effectively realize the reactive voltage coordination control of the 220kV renewable energy station and the 220kV renewable energy convergence substation, when the reactive power regulation capability of the renewable energy station is sufficient, the voltage is regulated by preferentially using the self reactive power of the renewable energy station, and the reactive power regulation in the 220kV renewable energy convergence substation is prevented from being realized by too many capacitors or reactors; when the reactive power regulation capability of the renewable energy station is insufficient, the local dispatching AVC is timely put into or cut off reactive power equipment in the 220kV renewable energy collection substation through real-time information exchange between the provincial and local two-stage AVC systems, so that the bus voltage of the renewable energy collection region is in a normal range, and the voltage stability and the voltage quality of a power grid of the renewable energy collection region 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 method for provincial-local coordination control of the high-voltage bus voltage of the 220kV collection substation according to the 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, in each renewable energy station convergence area, a plurality of 220kV renewable energy stations are connected into a power grid through a 220kV convergence substation, the 220kV renewable energy stations are controlled by an provincial dispatching automatic voltage control system, and the 220kV convergence substation is controlled by a local dispatching automatic voltage control system. In order to avoid large-scale chain off-line caused by voltage, the reactive power regulation capability of the renewable energy station is fully exerted in the ground state to replace a static capacitor or a reactor to exert a voltage supporting function, and a large amount of excessive reactive power generated in the fault disturbance process due to excessive switching of the capacitor or the reactor in the ground state is avoided.
Therefore, the reactive voltage coordination principle of the renewable energy station and the 220kV collection substation is as follows:
1. preferential use of reactive power regulation capability of renewable energy stations in ground state
When the renewable energy station has reactive power regulation capability, the low-voltage reactive equipment in the 220kV collecting substation does not participate in voltage regulation of the renewable energy station, and the bus voltage of the 220kV collecting substation is in a voltage static safety domain safe to the wind power region N-1 through reactive power regulation of renewable energy sources and SVCs (static var compensators) in the renewable energy stations.
2. When the reactive power regulation capability of the renewable energy station is insufficient, the low-voltage side reactive equipment in the 220kV convergence substation is used for carrying out the voltage regulation of the renewable energy region
When the reactive power regulation capability of the renewable energy station in the renewable energy collection area is insufficient, namely the reactive power regulation capability in the renewable energy station is lower than a given limit value, low-voltage reactive power equipment in the 220kV collection substation is switched, so that the bus voltage in the 220kV collection substation is within a voltage safety limit value.
In order to realize the reactive voltage coordination control principle of the renewable energy station and the 220kV convergence substation, the invention provides and realizes a provincial and regional two-stage coordination control method. As shown in fig. 2, the method for provincial-local coordination control of the high-voltage bus voltage of the 220kV collection substation comprises the following steps executed when a control period (one control period every 5 minutes) comes:
step S1, acquiring the voltage regulation demand of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area in the provincial regulation automatic voltage control system, wherein j is a natural number, and j is larger than or equal to 1 and smaller than or equal to the total number of the renewable energy station collection areas in the preset area. Here, the predetermined region may be, for example, the entire yunan province or a certain section of the yunan province.
And step S2, calculating the total voltage regulation capacity of all 220kV renewable energy stations in the jth renewable energy station gathering area.
Step S3, evaluating whether the total voltage regulation capability satisfies the voltage regulation demand.
And step S4, if the total voltage regulation capacity is enough to regulate the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area, regulating the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area by using the voltage regulation capacity of the 220kV renewable energy station.
And step S5, if the total voltage regulation capacity is not enough to regulate the voltage of the high-voltage bus of the 220kV collection substation in the collection area of the jth renewable energy station, calculating the reactive power demand limit range of the provincial and local coordination gateway corresponding to the 220kV collection substation.
And step S6, the provincial dispatching automatic voltage control system issues the limit value range to a local dispatching automatic voltage control system, the local dispatching automatic voltage control system regulates the voltage of the 220kV convergence substation high-voltage bus of the jth renewable energy source station convergence region by controlling the reactive power equipment in the 220kV convergence substation of the jth renewable energy source station convergence region through the total voltage regulation capability in the step S2, and the reactive power equipment supplements and regulates the voltage of the 220kV convergence substation high-voltage bus of the jth renewable energy source station convergence region.
In step S7, j is changed to j +1, and the process returns to step S1.
According to an embodiment of the present invention, the step S1 may specifically include:
in a provincial dispatching automatic voltage control system, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus in a collection area of a jth renewable energy station in a power grid, namely:
wherein:in order to obtain a control target value of a high-voltage bus of a 220kV collection substation through global optimization calculation in the automatic voltage control system of the provincial power grid,is the actual value of the bus voltage,the demand is regulated for the bus voltage.
According to an embodiment of the present invention, the step S2 may specifically include:
step S21, receiving the increasable reactive power and the reducible reactive power sent by the ith 220kV renewable energy station in the jth renewable energy station convergence area in real time, and calculating the voltage increase and decrease adjusting capability of the ith 220kV renewable energy station to the 220kV convergence substation high-voltage bus according to the reactive voltage sensitivity of the ith 220kV renewable energy station to the 220kV convergence substation high-voltage bus:
whereinThe method comprises the steps that increased reactive power and decreased reactive power are sent to an ith 220kV renewable energy station in a jth renewable energy station gathering area in real time, 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 renewable energy stations in the jth renewable energy station gathering area;
step S22, return to step S21 with i equal to i + 1;
step S23, accumulating the voltage increase and decrease adjustment capacities of all 220kV renewable energy stations in the jth renewable energy station gathering area:
according to an embodiment of the present invention, the step S3 may specifically include:
step S31, ifThen checking and judging:
if equation (4) is true, it is determined that the total voltage increase regulation capability of all 220kV renewable energy stations in the jth renewable energy station concentration area is insufficient, wherein,taking 0.5-1.0kV as a threshold value for regulating the voltage of a high-voltage bus of the current coordinated substation; rpTaking 0.5-0.7 of a threshold value for the coordinated control of the renewable energy source station and the transformer substation;
step S32, ifThen checking and judging:
if equation (5) holds, it is determined that the total voltage reduction regulation capability of all 220kV renewable energy stations in the jth renewable energy station concentration area is insufficient, wherein,taking 0.5-1.0kV as a threshold value for regulating the voltage of a high-voltage bus of the current coordinated substation; rpAnd taking 0.5-0.7 as a renewable energy source station and a transformer substation coordination control threshold value.
According to an embodiment of the present invention, the step S5 may specifically include:
step S51, initializing a reactive power demand limit range of a provincial and local coordination gateway corresponding to the 220kV convergence substation as follows:
wherein:to coordinate the current reactive value of the gateway conservatively,taking 20-30Mvar for provincial and local coordination gateway reactive power regulation dead zone parameter values;
step S52, ifAnd in step S31, if it is determined that the total voltage increase regulation capability of all 220kV renewable energy stations in the jth renewable energy station convergence area is insufficient, calculating the reactive power coordination control regulation requirement of the 220kV convergence substation as follows:
whereinThe reactive injection voltage sensitivity of a 220kV collection substation high-voltage bus in a jth renewable energy station collection area is obtained; according to the calculation result, adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV convergence substation to be:
wherein,for the reactive power increase and regulation capacity of the provincial and local coordination gateway corresponding to the 220kV convergence substation sent by the local dispatching automatic voltage control system, the reactive power requirement limit value of the provincial and local coordination gateway corresponding to the 220kV convergence substation is updated as follows:
step S53, ifAnd in step S32, if it is determined that the total voltage reduction regulation capability of all 220kV renewable energy stations in the jth renewable energy station convergence area is insufficient, calculating the reactive power coordination control regulation requirement of the 220kV convergence substation as follows:
whereinThe reactive injection voltage sensitivity of a high-voltage bus of a 220kV collection substation in the electric collection area of the jth renewable energy station is obtained; according to the calculation result, adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV convergence substation to be:
wherein,for ground-regulation, automatically supplied by voltage control systemThe reactive power reduction regulation capacity of the provincial and local coordination gateway corresponding to the 220kV convergence substation is realized, and the reactive power requirement limit value of the provincial and local coordination gateway corresponding to the 220kV convergence substation is updated as follows:
the corrected limit value range is adjusted by the provincial dispatching automatic voltage control systemAnd sending the voltage to a local dispatching automatic voltage control system, wherein the local dispatching automatic voltage control system collects reactive equipment in a transformer substation by controlling 220kV, so that the voltage regulation capacity of the reactive equipment and the total voltage regulation capacity in the step S2 meet the voltage regulation demand.
According to one embodiment of the invention, the renewable energy site is a wind power plant or a photovoltaic power plant.
The method for provincial and local coordinated control of the high-voltage bus voltage of the 220kV collection substation is described by way of example in connection with 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 provincial dispatching AVC system directly controls a 220kV wind farm B and a 220kV wind farm C; and the local dispatching AVC system directly controls the 220kV wind power collection substation A. The current voltage of a high-voltage bus (220kV bus) of the 220kV wind power collection substation is 229.06kV, and the set voltage is 230.50 kV. An SVC (Static Var Compensator) is provided in each renewable energy station.
For the regional power grid shown in fig. 1, the method for provincial-local coordination control of 220kV collection substation high-voltage bus voltage performs the following steps when a control period (one control period every 5 minutes) comes:
1) in the provincial dispatching AVC, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus of a jth wind power collection area in a power grid, namely:
wherein:in order to obtain a control target value of a high-voltage bus of a 220kV collection substation through global optimization calculation in the automatic voltage control system of the provincial power grid,is the actual value of the bus voltage,adjusting demand for bus voltage;
2) in the provincial dispatching AVC system, the following calculation is performed on each 220kV wind power plant in the jth wind power collection region:
2-1) receiving the increasable reactive power sent by the wind power plant B, C in the gathering area in real timeAnd reducible reactive powerAnd according to the reactive voltage sensitivity of the wind power plant to the 220kV wind power collection substation high-voltage bus, calculating the voltage increase and decrease adjusting capacity of the wind power plant to the 220kV wind power collection substation high-voltage bus:
b, wind power plant:the sensitivity was 0.2, calculated to give an upward adjustable voltage of 2.0 x 0.2-0.4 kV and a downward adjustable voltage of 3.0 x 0.2-0.6 kV;
c, wind power plant:the sensitivity was 0.2, and the up-adjustable voltage 2.0 x 0.2-0.4 kV and down-adjustable were calculatedAdjusting the voltage to 2.5 × 0.2 ═ 0.5 kV;
2-2) integrating the adjusting capacity of the wind field B, C on the main transformer high-voltage side bus of the wind power collection substation into the total bus voltage adjusting capacity of the wind power collection area:
3) evaluating the voltage regulation capacity of all wind power plants in the wind power collection area, wherein the method comprises the following steps:
getRp0.6, currently(1.44>1.0), then it is determined whether the following holds:(0.8<1.44 x 0.6); the formula is established, and the wind power voltage increase and regulation capacity in the region is judged to be insufficient;
4) calculating a reactive power demand limit range of a provincial and local coordination gateway corresponding to a 220kV wind power collection substation according to the evaluation result of the voltage regulation capability of the wind power plant participating in the wind power collection region in the step 3), wherein the method comprises the following steps:
4-1) initializing a reactive power demand limit range of a provincial and local coordination gateway corresponding to a 220kV convergence substation,
wherein:
4-2) because the total voltage increase and regulation capacity of all wind power plants in the current wind power collection area is judged to be insufficient in the step 3), the wind power collection substation is required to perform coordinated voltage increase,
4-2-1) calculating the reactive power coordination control regulation requirement of the wind power collection substation according to the formula (7) as follows:
get
4-2-2) adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV wind power collection substation according to the formula (8):
5) the modified limit range of provincial dispatching AVCConverted to power factor 0.97, 1.0]And then, the system is issued to a local dispatching AVC system, and the local dispatching AVC system enables provincial and local coordination gateway to meet the requirements of provincial dispatching AVC in a reactive power mode by controlling reactive power equipment (such as capacitors or reactors in capacitor/reactor groups) in a 220kV wind power collection substation.
6) And returning to the step 1), continuously processing the 220kV collection substation of the next wind power collection area until the 220kV collection substations of all the wind power collection areas in the power grid are processed.
In conclusion, the invention provides a method for coordinately controlling the voltage of a high-voltage bus of a 220kV collecting substation in a provincial and local manner, which can effectively realize the reactive voltage coordination control of a 220kV renewable energy station and the 220kV renewable energy collecting substation, and when the reactive power regulation capability of the renewable energy station is sufficient, the voltage is regulated by preferentially using the reactive power of the renewable energy station, so that the situation that too much 220kV renewable energy is input into a capacitor in the 220kV collecting substation is avoided; when the reactive power regulation capability of the renewable energy station is insufficient, the local transfer AVC is timely put into reactive power equipment in the 220kV renewable energy collection substation through real-time information exchange between the provincial and local two-stage AVC systems, so that the bus voltage of the renewable energy collection region is in a normal range, and the voltage stability and the voltage quality of a power grid in the renewable energy collection region 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 (7)
1. A method for provincial and local coordination control of high-voltage bus voltage of 220kV convergence substations is characterized in that in each convergence area of renewable energy stations, a plurality of 220kV renewable energy stations are connected into a power grid through a 220kV convergence substation, the 220kV renewable energy stations are controlled by a provincial dispatching automatic voltage control system, the 220kV convergence substation is controlled by a local dispatching automatic voltage control system,
when the control period comes, the method executes the following steps:
step S1, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus in a jth renewable energy station collection area in a provincial regulation automatic voltage control system, wherein 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 renewable energy station collection areas in a preset area;
step S2, calculating the total voltage regulation capacity of all 220kV renewable energy stations in the jth renewable energy station gathering area;
step S3, evaluating whether the total voltage regulation capability satisfies the voltage regulation demand;
step S4, if the total voltage regulation capacity is enough to regulate the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area, the voltage regulation capacity of the 220kV renewable energy station is used for regulating the voltage of the 220kV collection substation high-voltage bus in the jth renewable energy station collection area;
step S5, if the total voltage regulation capacity is not enough to regulate the voltage of a high-voltage bus of a 220kV collection substation in a collection area of a jth renewable energy station, calculating a provincial and local coordination gateway reactive power demand limit range corresponding to the 220kV collection substation;
step S6, the provincial dispatching automatic voltage control system issues the limit value range to a local dispatching automatic voltage control system, the local dispatching automatic voltage control system controls reactive equipment in a 220kV convergence substation in a jth renewable energy station convergence region, so that the reactive equipment supplements and adjusts the voltage of the 220kV convergence substation high-voltage bus in the jth renewable energy station convergence region except that the total voltage adjusting capacity in the step S2 is used for adjusting the voltage of the 220kV convergence substation high-voltage bus in the jth renewable energy station convergence region;
in step S7, j is changed to j +1, and the process returns to step S1.
2. The method for provincial and local coordination control of 220kV collection substation high voltage bus voltages according to claim 1, wherein step S1 comprises:
in a provincial dispatching automatic voltage control system, acquiring the voltage regulation demand of a 220kV collection substation high-voltage bus in a collection area of a jth renewable energy station in a power grid, namely:
wherein:for the control target value of the high-voltage bus of the 220kV collection substation given by global optimization calculation in the provincial automatic voltage control system,is the actual value of the bus voltage,the demand is regulated for the bus voltage.
3. The method for provincial and local coordination control of 220kV collection substation high voltage bus voltages according to claim 2, wherein step S2 comprises:
step S21, receiving the increasable reactive power and the reducible reactive power sent by the ith 220kV renewable energy station in the jth renewable energy station convergence area in real time, and calculating the voltage increase and decrease adjusting capability of the ith 220kV renewable energy station to the 220kV convergence substation high-voltage bus according to the reactive voltage sensitivity of the ith 220kV renewable energy station to the 220kV convergence substation high-voltage bus:
whereinThe increasable reactive power and the decreasable reactive power are uploaded to the ith 220kV renewable energy station in the jth renewable energy station gathering area in real time,the reactive injection voltage sensitivity of a high-voltage bus of a 220kV collection substation in a jth renewable energy station collection area is represented, 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 renewable energy stations in the jth renewable energy station collection area;
step S22, return to step S21 with i equal to i + 1;
step S23, accumulating the voltage increase and decrease adjustment capacities of all 220kV renewable energy stations in the jth renewable energy station gathering area:
4. the method for provincial and local coordination control of 220kV collection substation high voltage bus voltages according to claim 3, wherein step S3 comprises:
step S31, ifThen checking and judging:
if equation (4) is true, it is determined that the total voltage increase regulation capability of all 220kV renewable energy stations in the jth renewable energy station concentration area is insufficient, wherein,taking 0.5-1.0kV as a threshold value for regulating the voltage of a high-voltage bus of the current coordinated substation; rpTaking 0.5-0.7 of a threshold value for the coordinated control of the renewable energy source station and the transformer substation;
step S32, ifThen checking and judging:
if equation (5) holds, it is determined that the total voltage reduction regulation capability of all 220kV renewable energy stations in the jth renewable energy station concentration area is insufficient, wherein,taking 0.5-1.0kV as a threshold value for regulating the voltage of a high-voltage bus of the current coordinated substation; rpAnd taking 0.5-0.7 as a renewable energy source station and a transformer substation coordination control threshold value.
5. The method for provincial and local coordination control of 220kV collection substation high voltage bus voltages according to claim 4, wherein step S5 comprises:
step S51, initializing a reactive power demand limit range of a provincial and local coordination gateway corresponding to the 220kV convergence substation as follows:
wherein:to coordinate the current reactive value of the gateway conservatively,taking 20-30Mvar for provincial and local coordination gateway reactive power regulation dead zone parameter values;
step S52, ifAnd if it is determined in step S31 that the total voltage increase regulation capability of all 220kV renewable energy stations in the jth renewable energy station convergence area is insufficient, calculating the reactive coordination of the 220kV convergence substationThe control regulation requirements are as follows:
according to the calculation result, adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV convergence substation to be:
wherein,for the reactive power increase and regulation capacity of the provincial and local coordination gateway corresponding to the 220kV convergence substation sent by the local dispatching automatic voltage control system, the reactive power requirement limit value of the provincial and local coordination gateway corresponding to the 220kV convergence substation is updated as follows:
step S53, ifAnd in step S32, if it is determined that the total voltage reduction regulation capability of all 220kV renewable energy stations in the jth renewable energy station convergence area is insufficient, calculating the reactive power coordination control regulation requirement of the 220kV convergence substation as follows:
whereinThe reactive injection voltage sensitivity of a high-voltage bus of a 220kV collection substation in the electric collection area of the jth renewable energy station is obtained; according to the calculation result, adjusting the coordination reactive upper limit of a provincial and local coordination gateway corresponding to the 220kV convergence substationComprises the following steps:
wherein,for the reactive power reduction regulation capacity of the provincial and local coordination gateway corresponding to the 220kV convergence substation sent by the local dispatching automatic voltage control system, the reactive power requirement limit value of the provincial and local coordination gateway corresponding to the 220kV convergence substation is updated to be:
the corrected limit value range is adjusted by the provincial dispatching automatic voltage control systemAnd sending the voltage to a local dispatching automatic voltage control system, wherein the local dispatching automatic voltage control system collects reactive equipment in a transformer substation by controlling 220kV, so that the voltage regulation capacity of the reactive equipment and the total voltage regulation capacity in the step S2 meet the voltage regulation demand.
6. The method for provincial-local coordination control of 220kV collection substation high-voltage bus voltages according to claim 1, wherein the renewable energy station is a wind power station or a photovoltaic power station.
7. The method for provincial-local coordination control of the voltage of the high-voltage bus of the 220kV collection substation according to claim 1, wherein every 5 minutes is a control period.
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| CN103762602A (en) * | 2013-12-31 | 2014-04-30 | 华东电网有限公司 | Automatic voltage control method for power grid provincial coordination transformer substation |
| CN104868484A (en) * | 2015-05-26 | 2015-08-26 | 华南理工大学 | 220/110kV transformer station upper-lower coordination wattless control method |
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| CN102280882A (en) * | 2011-08-19 | 2011-12-14 | 天津市电力公司 | Provincial and regional coordinated voltage control method employing composite coordination gateways |
| CN103762602A (en) * | 2013-12-31 | 2014-04-30 | 华东电网有限公司 | Automatic voltage control method for power grid provincial coordination transformer substation |
| CN104868484A (en) * | 2015-05-26 | 2015-08-26 | 华南理工大学 | 220/110kV transformer station upper-lower coordination wattless control method |
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