A reactive voltage control method for renewable energy collection areas considering power generation trends

Abstract

The present invention proposes a reactive voltage control method for a new energy collection area considering power generation trends, and belongs to the technical field of power grid dispatching. The method obtains the ultra-short-term power generation forecast information of the new energy power grid, the operating status information of the transmission section, the trading plan information of the tie line, and the sensitivity information of the new energy unit to the bus voltage and the transmission section flow at the beginning of each control cycle in the automatic voltage control; calculates the change in bus voltage during reactive adjustment of the new energy unit in each new energy power grid coordinated control area and the change in bus voltage and transmission section flow during active adjustment of the new energy station, and obtains the ultra-short-term power generation plan of each new energy station, so as to correct the operating control limit of the bus voltage in the ultra-short term, and finally realizes the correction control of the bus voltage in all power grid coordinated control areas. The present invention avoids the problem of severe voltage fluctuations in the new energy power grid through advanced preventive control based on ultra-short-term voltage prediction.

Description

Technical Field

[0001] The invention belongs to the technical field of power grid dispatching, and in particular relates to a reactive voltage control method for a new energy collection area taking power generation trends into consideration. Background Art

[0002] The proportion of renewable energy in the newly installed capacity of the power grid is increasing day by day. In areas rich in wind and light resources, a new energy station gathering area has been formed. The reactive voltage control problem of the power grid in the new energy gathering area has gradually become prominent. Conventional automatic voltage control is generally based on the real-time power grid operation status, and does not consider the impact of the new energy generation trend on the voltage. Due to the randomness and volatility of new energy, during the period of rapid change of new energy generation, the power grid in the new energy gathering area has the problem of drastic voltage fluctuations. In severe cases, it may cause the new energy station to be disconnected from the grid, which to a certain extent reduces the voltage safety and stability level of the new energy power grid and affects the new energy power consumption and delivery in the new energy gathering area. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and propose a reactive voltage control method for a new energy gathering area that takes into account the power generation trend. In the process of realizing reactive voltage control of the power grid, the present invention can prevent the new energy power grid from experiencing severe voltage fluctuations through advance preventive control based on ultra-short-term voltage prediction, thereby ensuring the safe and stable operation of the voltage of the new energy power grid and providing support for the consumption and delivery of new energy power in the new energy gathering area.

[0004] The embodiment of the present invention provides a reactive voltage control method for a new energy collection area taking into account power generation trends, including:

[0005] 1) The 500kV substation with a lower-level 220kV new energy station in the new energy gathering area is marked as the new energy grid coordinated control area, and all new energy grid coordinated control areas constitute the coordinated control area model of the new energy grid;

[0006] 2) At the beginning of each control cycle in the automatic voltage control, obtaining new energy ultra-short-term power generation forecast information, transmission section operation status information and tie line transaction plan information of the new energy grid;

[0007] 3) Based on the coordinated control area model of the new energy power grid, the sensitivity information of the new energy generating unit to the bus voltage and the transmission section flow at the starting time is obtained;

[0008] 4) Based on the results of steps 2) and 3), the initial operation state information of the power grid at the start time is obtained, and then the change in bus voltage during reactive power adjustment of each new energy generating unit in the new energy power grid coordinated control area and the change in bus voltage and transmission section flow during active power adjustment of the new energy station are calculated;

[0009] 5) Based on the result of step 4), the ultra-short-term power generation plan of each new energy station in the new energy power grid is obtained, and then the operation control limit of the bus voltage in the ultra-short term is corrected;

[0010] 6) Based on the bus voltage operating status information of the new energy power grid coordinated control area at the starting time, combined with the operating control limit of the bus voltage within the ultra-short-term prediction period, the bus voltage correction control of the new energy power grid coordinated control area is performed.

[0011] In a specific embodiment of the present invention, the coordinated control area model of the new energy grid is expressed as follows:

[0012]

[0013] Where K represents the total number of coordinated control areas in the renewable energy grid; is the kth coordinated control area;

[0014]

[0015] in, The information of the 220kV busbar of the xth substation in the kth coordinated control area is: is the information of the 220kV busbar of the yth new energy station in the kth coordinated control area, is the information of the u-th renewable energy station unit in the k-th coordinated control area, It is the information of the g-th new energy station in the k-th coordinated control area.

[0016] In a specific embodiment of the present invention, the obtaining of new energy ultra-short-term power generation forecast information, transmission section operation status information and tie line transaction plan information of the new energy power grid includes:

[0017] 2-1) Let the start time of the current control cycle be T c , let the serial number of the new energy station in the kth coordinated control area be g, g = 1, ... G, G represents the total number of new energy stations in the coordinated control area, the Tth c The ultra-short-term forecast information of renewable energy power generation in the coordinated control area at this moment is:

[0018]

[0019] Among them, Pre k,c Indicates the T c The ultra-short-term power generation forecast information of renewable energy in the kth coordinated control area at time T. c time, For the g-th new energy station in the Tc Ultra-short-term power generation forecast information at all times;

[0020]

[0021] Wherein, the subscript t corresponds to the sampling time of ultra-short-term power generation forecast, is the predicted active power value of the g-th renewable energy station at the t-th sampling time, and the T-th c Time is the starting time of sampling, the Tth N Time is the end time of sampling;

[0022] 2-2) Let the serial number of the transmission section in the new energy grid be s, s = 1, ... S, S represents the total number of transmission sections in the grid, and the grid is in the Tth c The transmission section operation status information at the moment is Sanp c :

[0023]

[0024] in, is the sth transmission section at the Tth c The active sampling value at the moment, is the lower limit of the operation control of the sth transmission section, is the upper limit of the operation control of the sth transmission section;

[0025] 2-3) Let the grid tie line be at T c The running status information at this moment is Tie c :

[0026]

[0027] in, For the contact line at T c The active sampling value at the moment, For the contact line at D m Trading plan information for the day, Control dead zone for active power transaction of tie line;

[0028] Then the grid tie line starts from T c From time to T N The transaction plan information at the end of time is

[0029]

[0030] in, is the planned active power value of the grid tie line at the tth sampling moment.

[0031] In a specific embodiment of the present invention, the obtaining of the sensitivity information of the new energy generating unit to the bus voltage and the transmission section flow at the start time includes:

[0032] Let the serial number of the new energy generating unit in the kth coordinated control area be u, u=1,...U, and U represents the total number of new energy generating units in the coordinated control area;

[0033] Then the new energy units and stations in the kth coordinated control area are c The sensitivity information at this moment is Sens k,c :

[0034]

[0035] in, For the T c The sensitivity information of reactive power of the new energy generating unit in the kth coordinated control area to the bus voltage at the moment; For the T c The sensitivity information of the active power of the new energy unit in the kth coordinated control area to the bus voltage; For the T c The sensitivity information of the active power of the new energy units in the kth coordinated control area to the section power flow, For the T c The sensitivity information of the active power of the new energy station in the kth coordinated control area to the bus voltage;

[0036] in,

[0037]

[0038] in, For the T c The sensitivity information of the reactive power of the u-th renewable energy unit to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the reactive power of the u-th renewable energy unit to the y-th renewable energy station 220kV control bus voltage;

[0039]

[0040] in, For the T c The sensitivity information of the active power of the u-th renewable energy unit to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the active power of the u-th renewable energy unit to the y-th renewable energy station 220kV control bus voltage;

[0041]

[0042] in, For the T c The active power of the u-th renewable energy unit at the moment is a collection of the sensitivity information of the power flow of a total of S transmission sections in the power grid; For the T c The sensitivity information of the active power of the u-th renewable energy unit to the power flow of the s-th transmission section in the power grid;

[0043]

[0044] in, For the T c The sensitivity information of the active power of the g-th new energy station to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the active power of the g-th renewable energy station to the y-th renewable energy station 220kV control bus voltage; For the T c The active power of the g-th renewable energy station at the moment is a collection of the sensitivity information of the power flow of a total of S transmission sections in the power grid; For the T c The sensitivity information of the active power of the g-th renewable energy station to the power flow of the s-th transmission section in the power grid at time instant.

[0045] In a specific embodiment of the present invention, the method further comprises:

[0046] 4-1) Obtaining new energy grid in the T c Initial operation status information F at time m,c :

[0047]

[0048] Among them, Sanp c For the T c The operating status information of the transmission section in the power grid at all times, Tie c For the T c Operation status information of tie lines in the power grid at all times;

[0049] 4-2) According to the result of step 4-1), obtain the Tth c The operating status at the moment;

[0050] Among them, for the kth new energy grid coordination control area, it includes:

[0051] Let the serial number of the 220kV central busbar in the kth coordinated control area be x, x = 1, ... X, X represents the total number of 220kV central busbars in the kth coordinated control area, cInitial state information of 220kV central bus in the kth coordinated control area at time for:

[0052]

[0053] in, The xth central bus is at the T c The voltage sampling value at the moment, The xth central bus is at the T c The voltage operation control lower limit value at the moment, The xth central bus is at the T c The voltage operation control upper limit value at the moment; the serial number of the 220kV control bus in the kth coordinated control area is set to y, y = 1, ... Y, Y represents the total number of 220kV control buses in the kth coordinated control area, the Tth c Initial state information of 220kV control bus in the kth coordinated control area at time for:

[0054]

[0055] in, The yth control bus is at the Tth c The voltage sampling value at the moment, The yth control bus is at the Tth c The voltage operation control lower limit value at the moment, The yth control bus is at the Tth c The voltage operation control upper limit at time T; the new energy unit in the kth coordinated control area at time T c Initial state information at the moment for:

[0056]

[0057] in, For the T c The active sampling value of the u-th renewable energy unit at time, For the T c The reactive sampling value of the u-th renewable energy unit at time, The minimum reactive power output of the u-th renewable energy unit, is the maximum reactive power output of the u-th renewable energy unit, is the installed capacity of the u-th renewable energy unit, Bs u is the 220kV control busbar index corresponding to the u-th renewable energy unit, Gen u Subscribe the station corresponding to the u-th new energy unit;

[0058] The kth coordinated control area's new energy station is located in the Tthc Initial state information at the moment for:

[0059]

[0060] in, For the T c The active sampling value of the g-th new energy station at time, For the T c The reactive power sampling value of a new energy station at time g, is the installed capacity of the g-th new energy station;

[0061] No. T c The relationship between the active sampling value and reactive sampling value of the new energy station and the new energy unit at each moment is as follows:

[0062]

[0063] No. T c The active sensitivity information relationship between the new energy station and the new energy unit at any given moment is as follows:

[0064]

[0065] 4-3) Calculate the change in bus voltage during reactive power adjustment of renewable energy generating units in each coordinated control area and the change in bus voltage and transmission section power flow during active power adjustment of renewable energy stations;

[0066] Among them, for the change in bus voltage during reactive power adjustment of the u-th renewable energy unit in the k-th coordinated control area, the calculation process is as follows:

[0067] Set T c The reactive power adjustment of the uth renewable energy unit at the moment is ΔQ u,c , then:

[0068]

[0069] Where, ΔV x,c is the reactive power adjustment ΔQ of u renewable energy units in the kth coordinated control area u,c When , the voltage change of the xth 220kV central busbar;

[0070]

[0071] Where, ΔV y,c is the reactive power adjustment ΔQ of the u-th renewable energy unit in the k-th coordinated control area u,c When , the voltage change of the yth 220kV control bus;

[0072] The calculation process for the changes in bus voltage and transmission section power flow when the active power of the g-th renewable energy station in the k-th coordinated control area is adjusted is as follows:

[0073] Set T c The adjustment amount of the active power of the g-th new energy station at the moment is ΔP g,c , then:

[0074]

[0075] Where, ΔV x,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the voltage change of the xth 220kV central busbar;

[0076]

[0077] Where, ΔV y,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the voltage change of the yth 220kV control bus;

[0078]

[0079] Among them, ΔP s,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c The change in active power of the sth transmission section flow at time .

[0080] In a specific embodiment of the present invention, the method further comprises:

[0081] 5-1) Assume that the serial number of the conventional units in the power grid is n, n = 1, ... N, N represents the total number of conventional units in the power grid, and the minimum technical output of the nth conventional unit is

[0082] Note that the power grid starts from T c From time to T N New energy consumption space information Mva at the end of the moment m,t for:

[0083]

[0084] Among them, Load m,c For the T c The total power load power of the power grid at the moment, is the available space for the switching plan of the grid tie line at time t, It is the accumulated value of the minimum technical output of conventional units in the power grid;

[0085] Then the available space information of ultra-short-term renewable energy consumption in the power grid is ΔMva m,t :

[0086]

[0087] 5-2) Construct a new energy source to absorb the deviation A quadratic programming model for the optimization objective; specifically including:

[0088] Construct the objective function:

[0089]

[0090] Among them, ΔP g is the active power adjustment amount generated by the g-th new energy station; It represents the deviation between the total available space for accommodating new energy in the power grid and the actual utilization; β is the coefficient of the deviation of the utilization of the accommodating space; W is the active load rate balance index of the new energy station; a and W r is the weight coefficient;

[0091] in,

[0092]

[0093] in, The total amount of additional active power generated by new energy stations across the entire network;

[0094]

[0095] Among them, R g is the active load rate of the g-th new energy station, R avg is the average active load rate of the new energy stations in the power grid;

[0096]

[0097] Build constraints, including:

[0098] After the active output of new energy stations is adjusted, the power generation capacity constraints must be met:

[0099] and

[0100] The active output of new energy stations must meet the constraints of the power flow control limit of the transmission section:

[0101]

[0102] The total amount of additional active power generated by new energy stations must meet the constraints of the current available power grid consumption space:

[0103]

[0104] 5-3) Solve the quadratic programming model of step 5-2) to obtain the active power of the g-th renewable energy station from the T-th c Time to T N Ultra-short-term plan adjustment information at the moment

[0105]

[0106] Then in the T c At time g, the new energy station starts from T c Time to T N The ultra-short-term active power generation plan information at time

[0107]

[0108] 5-4) Based on the result of step 5-3), the Tth c The maximum voltage fluctuation information of the central bus and control bus in each coordinated control area at any time;

[0109] Among them, let T c The ultra-short-term prediction information of the central bus voltage fluctuation in the kth coordinated control area at time is:

[0110]

[0111] Let T c The ultra-short-term prediction information of the control bus voltage fluctuation in the kth coordinated control area at time is:

[0112]

[0113] Traverse separately and The maximum value of the continuous rise and continuous drop of the central bus voltage and the control bus voltage is obtained; the maximum value of the continuous rise of the central bus voltage is recorded as The maximum value of the continuous drop is The maximum value of the continuous rise of the control bus voltage is The maximum value of the continuous drop is

[0114] 5-5) Based on the result of step 5-4), the operation control limit of the bus voltage is corrected within this ultra-short-term prediction period;

[0115] Among them, the modified operation control limit of the 220kV central bus in the kth coordinated control area is:

[0116]

[0117] in, is the voltage operation control lower limit of the xth central bus in this forecast period, is the voltage operation control upper limit of the xth central bus in this forecast period;

[0118] The corrected operating control limit of the 220kV control bus in the kth coordinated control area is:

[0119]

[0120] in, is the voltage operation control lower limit of the y-th control bus in this prediction period, It is the voltage operation control upper limit of the y-th control bus in this prediction period.

[0121] In a specific embodiment of the present invention, the bus voltage correction control of the new energy grid coordinated control area includes:

[0122] 6-1) Obtain the bus voltage operation status information of the current new energy grid coordinated control area, including:

[0123] No. T c The operating status information of the 220kV central bus voltage in the kth coordinated control area at time is:

[0124]

[0125] No. T c The operating status information of the 220kV control bus voltage in the kth coordinated control area at the moment is:

[0126]

[0127] 6-2) According to the result of step 6-1), determine whether it is necessary to perform voltage correction control on the coordinated control area; the specific steps are as follows:

[0128] 6-2-1) Detect the voltage of X central buses in the current coordinated control area Is there any value that is not in Situation of the interval: if it exists, then mark the coordinated control area as needing to start voltage correction control and go to step 6-3); if it does not exist, then go to step 6-2-2);

[0129] 6-2-2) Detect the voltage of Y control buses in the current coordinated control area Is there any value that is not in Situation of the interval: if it exists, it is marked that the coordinated control area needs to start voltage correction control and go to step 6-3); if it does not exist, the reactive power output of the new energy station in the coordinated control area remains unchanged and the current bus voltage is maintained;

[0130] 6-3) Construct a quadratic programming model with the central bus voltage deviation as the optimization target;

[0131] Among them, the objective function of the model is:

[0132]

[0133] Among them, ΔQ u It is the reactive power adjustment of the new energy unit; Indicates the deviation between the central bus voltage setting target value and the voltage sampling value; α is the coefficient of bus voltage adjustment deviation; θ u is the reactive power balance index of the new energy unit; W p and W q is the weight coefficient; To set a target value for the central bus voltage:

[0134]

[0135] The constraints of the model include:

[0136] The maximum adjustment step size constraint of the central bus voltage is:

[0137]

[0138] The maximum adjustment step size constraint of the control bus voltage is:

[0139]

[0140] The voltage of the central busbar operates within the control upper and lower limits:

[0141]

[0142] The voltage of the control busbar is controlled within the upper and lower limits:

[0143]

[0144] Reactive power regulation range constraints of new energy units:

[0145]

[0146] Solve the quadratic programming model and get the Tth c The reactive power adjustment value ΔQ of the uth renewable energy unit at time u,c ;

[0147] 6-4) Based on the result of step 6-3), calculate the Tth c The set value of the 220kV control bus voltage of the yth new energy station in the kth coordinated control area at time

[0148]

[0149] Where, ΔV y,c For the T c The adjustment amount of the yth controlled bus voltage in the kth coordinated control area at the moment:

[0150]

[0151] 6-5) Let the strategy number of the 220kV control bus setting value generated by the new energy station in the kth coordinated control area be y strg ,y strg =1,……Y strg , Y strg represents the total number of bus control strategies in the kth coordinated control area, then the Tth c The strategy information of controlling the bus voltage setting value in the kth coordinated control area at time as follows:

[0152]

[0153] yth strg Control strategy information for:

[0154]

[0155] in, For the T c The voltage setting value of the yth 220kV control bus at time;

[0156] 6-6) The automatic voltage control master station of the power grid sends the T c The voltage setting value instruction of the 220kV control bus at time y is realized c At time k, the yth line of the kth coordinated control area controls the bus voltage adjustment.

[0157] In a specific embodiment of the present invention, the method further comprises:

[0158] The current time after all coordinated control areas complete reactive power and voltage control in the current control cycle is T' c , and obtain the new energy grid at the first T' c The running status information F' at the moment m,c :

[0159]

[0160] Among them, the superscript ' corresponds to the T' c time, For the power grid control model, at T' c Status information at all times;

[0161] No. T' c The information of the central bus and control bus in the kth coordinated control area at time is:

[0162]

[0163] in, For T' c Central bus information in the kth coordinated control area at time, For T' c The control bus information in the kth coordinated control area at the moment; The xth central bus is at T' c The voltage sampling value at the moment, The xth central bus is at T' c The voltage operation control lower limit value at the moment, The xth central bus is at T' c The voltage operation control upper limit at the moment; The yth control bus is at T' c The voltage sampling value at the moment, The yth control bus is at T' c The voltage operation control lower limit value at the moment, The yth control bus is at T' c The voltage operation control upper limit at the moment;

[0164] Among them, in the T' c The xth 220kV central bus voltage sampling value information at time for:

[0165]

[0166] In T' c The sampling value information of the yth 220kV control bus voltage for:

[0167]

[0168] No. T' c The information of the new energy unit in the kth coordinated control area at time is:

[0169]

[0170] in, For T' c Reactive sampling value information of the new energy unit in the kth coordinated control area at the moment;

[0171]

[0172] In the automatic voltage control, the next control cycle will arrive at the Tth c+1 At this moment, c+1 Moment as the new T c At this moment, the new energy grid will be at T' c The running status information at time T is used as the new c The initial operation status information of the power grid is obtained at every moment, and a new round of reactive power and voltage control process of the new energy power grid begins.

[0173] Features and beneficial effects of the present invention:

[0174] Since the power generation of new energy stations is random and volatile, the grid voltage in the new energy gathering area is obviously affected by the trend of new energy power generation. Therefore, it is challenging to maintain the safe and stable operation of the voltage of the new energy power grid. In severe cases, there is a problem that the voltage fluctuation in the new energy gathering area affects the consumption and transmission of new energy. The present invention uses a coordinated control strategy that considers the power generation trend in the reactive voltage control of the new energy power grid. While achieving the reasonable operation of the bus voltage of the new energy power grid, it comprehensively considers the ultra-short-term voltage change trend to make advance preventive control, thereby eliminating the problem of severe voltage fluctuations in the new energy power grid.

[0175] The present invention can calculate the ultra-short-term power generation plan data of the new energy station based on the ultra-short-term (next 1 to 2 hours) power generation forecast information of the new energy station, comprehensively consider the grid structure and absorption capacity of the new energy power grid, and then obtain the ultra-short-term voltage fluctuation of the new energy power grid. Using the above information, in the process of realizing the reactive power voltage control of the power grid, advance preventive control based on ultra-short-term voltage forecast can be carried out.

[0176] The present invention realizes coordinated reactive voltage control of the new energy power grid taking power generation trends into consideration. On the one hand, based on the current operation of the power grid, the reactive output of the new energy stations can be coordinated to ensure that the bus voltage of the new energy power grid operates within a reasonable range. On the other hand, in the process of realizing reactive voltage control of the power grid, the ultra-short-term voltage fluctuation of the new energy power grid is taken into consideration, and advance preventive control is made for possible voltage fluctuations in the power grid in the future, thereby ensuring the safe and stable operation of the voltage of the new energy power grid and improving the automatic voltage control level of the new energy power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0177] Figure 1It is an overall flow chart of a reactive voltage control method for a new energy collection area taking into account power generation trends according to an embodiment of the present invention. DETAILED DESCRIPTION

[0178] The present invention proposes a reactive voltage control method for a new energy collection area taking into account the power generation trend, which is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0179] The embodiment of the present invention provides a reactive voltage control method for a new energy collection area taking into account power generation trends, including:

[0180] 1) The 500kV substation with a lower-level 220kV new energy station in the new energy gathering area is marked as the new energy grid coordinated control area, and all new energy grid coordinated control areas constitute the coordinated control area model of the new energy grid;

[0181] 2) At the beginning of each control cycle in the automatic voltage control, obtaining new energy ultra-short-term power generation forecast information, transmission section operation status information and tie line transaction plan information of the new energy grid;

[0182] 3) Based on the coordinated control area model of the new energy power grid, the sensitivity information of the new energy generating unit to the bus voltage and the transmission section flow at the starting time is obtained;

[0183] 4) Based on the results of steps 2) and 3), the initial operation state information of the power grid at the start time is obtained, and then the change in bus voltage during reactive power adjustment of each new energy generating unit in the new energy power grid coordinated control area and the change in bus voltage and transmission section flow during active power adjustment of the new energy station are calculated;

[0184] 5) Based on the result of step 4), the ultra-short-term power generation plan of each new energy station in the new energy power grid is obtained, and then the operation control limit of the bus voltage in the ultra-short term is corrected;

[0185] 6) Based on the bus voltage operating status information of the new energy power grid coordinated control area at the starting time, combined with the operating control limit of the bus voltage within the ultra-short-term prediction period, the bus voltage correction control of the new energy power grid coordinated control area is performed.

[0186] In a specific embodiment of the present invention, the reactive voltage control method of a new energy collection area considering power generation trend is as follows: Figure 1 As shown, the following steps are included:

[0187] 1) Obtain the current daily renewable energy grid model and perform topological analysis to obtain a coordinated control area model of the renewable energy grid for automatic voltage control.

[0188] Specifically, let the current day be Dm , read the current day's new energy grid model G m And perform topological analysis.

[0189] For the power grid model G m Perform topological analysis on any 500kV substation (new energy centralized grid-connected substation, regional central station) in the new energy collection area, retrieve the new energy field station that has electrical connection with the 220kV busbar on the medium voltage side of the substation, and mark the 500kV substation with the lower-level 220kV new energy field station as a new energy grid 220kV coordinated control area.

[0190]

[0191] in, is the kth 220kV coordinated control area (hereinafter referred to as coordinated control area), The information of the 220kV busbar of the xth substation in the kth coordinated control area is: is the information of the 220kV busbar of the yth new energy station in the kth coordinated control area, is the information of the u-th renewable energy station unit in the k-th coordinated control area, It is the information of the g-th new energy station in the k-th coordinated control area.

[0192] In the automatic voltage control of the new energy grid, the 220kV busbar of the collection substation is generally selected as the central busbar, and the 220kV busbar of the new energy station is selected as the control busbar. m After all 500kV substations in the new energy collection area are traversed, a total of K new energy grid 220kV coordinated control areas are formed, and finally the coordinated control area model Z of the new energy grid is obtained. m Denoted as:

[0193]

[0194] Among them, K represents the total number of 220kV coordinated control areas in the new energy power grid.

[0195] 2) Let the start time of the current control cycle in the automatic voltage control of the new energy grid be T c , get the power grid at T c The ultra-short-term forecast information of renewable energy generation, the operation status information of transmission sections and the transaction plan information of tie lines at all times; the specific steps are as follows:

[0196] 2-1) Set the serial number of the new energy station in the kth coordinated control area to g, g = 1, ... G, G represents the total number of new energy stations in the coordinated control area, the Tth cThe ultra-short-term forecast information of renewable energy power generation in the coordinated control area at this moment is:

[0197]

[0198] Among them, Pre k,c Indicates the T c The ultra-short-term power generation forecast information of renewable energy in the kth coordinated control area at time T. c time, For the g-th new energy station in the T c Ultra-short-term power generation forecast information at the moment.

[0199]

[0200] Wherein, the subscript t corresponds to the sampling time of ultra-short-term power generation forecast, is the predicted active power generation value of the g-th new energy station at the t-th sampling time. In this embodiment, the sampling start time is the T-th c time, the end time is T N time.

[0201] In this embodiment, the ultra-short-term power generation forecast of new energy is the forecast of the maximum power generation capacity of the new energy station within a period of time in the future, which is generally the forecast of the power generation capacity of the station within a period of 120 minutes from the current moment. It should be noted that the ultra-short-term power generation forecast of new energy is not equal to the ultra-short-term power generation plan of new energy. The ultra-short-term power generation plan information of new energy is the data obtained after the power generation forecast is verified by the grid absorption capacity constraint.

[0202] 2-2) Set the transmission section number in the new energy grid to s, s = 1, ... S, S represents the total number of transmission sections in the grid, and the grid is in the Tth c The transmission section operation status information at the moment is Sanp c :

[0203]

[0204] in, is the sth transmission section at the Tth c The active sampling value at the moment, is the lower limit of the operation control of the sth transmission section, It is the upper limit of the operation control of the sth transmission section.

[0205] 2-3) Set the grid tie line at T c The running status information at this moment is Tie c :

[0206]

[0207] in, For the contact line at T c The active sampling value at the moment, For the contact line at D m Trading plan information for the day, Control the dead zone for active power transaction of the interconnection line.

[0208] Combined with step 2-1) obtained in the first c The ultra-short-term power generation forecast information of renewable energy at time T is obtained. c From time to T N The transaction plan information at the end of time is

[0209]

[0210] in, is the planned active power value of the grid tie line at the tth sampling moment.

[0211] 3) According to the coordinated control regional model of the new energy power grid obtained in step 1), the sensitivity information of the new energy units to the bus voltage and the transmission section flow at the beginning of the current control cycle is obtained through flow calculation.

[0212] Specifically, the serial number of the kth coordinated control area new energy unit is set to u, u=1, ... U, U represents the total number of the coordinated control area new energy units. c For example, at time T, the kth coordinated control area's new energy units and stations c The sensitivity information at this moment is Sens k,c :

[0213]

[0214] in, For the T c The sensitivity information of reactive power of the new energy generating unit in the kth coordinated control area to the bus voltage at the moment; For the T c The sensitivity information of the active power of the new energy unit in the kth coordinated control area to the bus voltage; For the T c The sensitivity information of the active power of the new energy units in the kth coordinated control area to the section power flow, For the T c The sensitivity information of the active power of the new energy station in the kth coordinated control area to the bus voltage at time.

[0215] Among them, the sensitivity information of the reactive power of the new energy unit to the bus voltage is:

[0216]

[0217] in, For the T c The sensitivity information of the reactive power of the u-th renewable energy unit to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the reactive power of the u-th renewable energy unit to the y-th renewable energy station 220kV control bus voltage;

[0218] The sensitivity information of the active power of the new energy unit to the bus voltage is:

[0219]

[0220] in, For the T c The sensitivity information of the active power of the u-th renewable energy unit to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the active power of the u-th renewable energy unit to the y-th renewable energy station 220kV control bus voltage;

[0221] The sensitivity information of the active power of new energy units to the power flow of the transmission section is:

[0222]

[0223] in, For the T c The active power of the u-th renewable energy unit at the moment is a collection of the sensitivity information of the power flow of a total of S transmission sections in the power grid; For the T c The sensitivity information of the active power of the u-th renewable energy unit to the power flow of the s-th transmission section in the power grid;

[0224] The sensitivity information of the active power of the new energy station to the bus voltage is:

[0225]

[0226] in, For the T c The sensitivity information of the active power of the g-th new energy station to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the active power of the g-th renewable energy station to the y-th renewable energy station 220kV control bus voltage; For the T c The active power of the g-th renewable energy station at the moment is a collection of the sensitivity information of the power flow of a total of S transmission sections in the power grid; For the T c The sensitivity information of the active power of the g-th renewable energy station to the power flow of the s-th transmission section in the power grid at time instant.

[0227] 4) Based on the results of step 2) and step 3), the initial operation status information of the power grid at the beginning of the current control cycle is obtained, and then the change in bus voltage during reactive power adjustment of new energy units in each coordinated control area and the change in bus voltage and transmission section flow during active power adjustment of new energy stations are calculated. The specific steps are as follows:

[0228] 4-1) Obtaining new energy grid in the T c Initial operation status information F at time m,c :

[0229]

[0230] Among them, the kth coordinated control area is in the Tth c Running status information at all times as follows:

[0231]

[0232] in, They are the 220kV central busbars of the kth coordination area model. 220kV control bus New energy units New energy stations In the T c Initial operating status information at the time.

[0233] It should be noted that since the collected values ​​of the power grid model equipment change in real time with the operation of the power grid, the subscript c is marked as the corresponding T c The status at different times is not exactly the same. When each control cycle arrives, the regional model operating status information corresponding to that time needs to be updated (without re-analyzing the model topology).

[0234] 4-2) According to the result of step 4-1), obtain the Tth time of each device in the power grid coordinated control model c The operating status at the moment.

[0235] For the kth new energy grid coordination control area, it includes:

[0236] The serial number of the 220kV central busbar in the kth coordinated control area is set to x, x = 1, ... X, X represents the total number of 220kV central busbars in the kth coordinated control area, and in the Tth c Initial state information of 220kV central bus in the kth coordinated control area at time for:

[0237]

[0238] in, The xth central bus is at the T c The voltage sampling value at the moment, The xth central bus is at the T c The voltage operation control lower limit value at the moment, The xth central bus is at the T c The voltage operation control upper limit value at the moment. Set the serial number of the 220kV control bus in the kth coordinated control area to y, y = 1, ... Y, Y represents the total number of 220kV control buses in the kth coordinated control area, and the Tth c Initial state information of 220kV control bus in the kth coordinated control area at time for:

[0239]

[0240] in, The yth control bus is at the Tth c The voltage sampling value at the moment, The yth control bus is at the Tth c The voltage operation control lower limit value at the moment, The yth control bus is at the Tth c The voltage operation control upper limit value at time T. c Initial state information at the moment for:

[0241]

[0242] in, For the T c The active sampling value of the u-th renewable energy unit at time, For the T c The reactive sampling value of the u-th renewable energy unit at time, The minimum reactive power output of the u-th renewable energy unit, is the maximum reactive power output of the u-th renewable energy unit, is the installed capacity of the u-th renewable energy unit, Bs u is the 220kV control busbar index corresponding to the u-th renewable energy unit, Gen u Subscript the station corresponding to the u-th new energy unit.

[0243] The kth coordinated control area's new energy station is located in the Tth c Initial state information at the moment for:

[0244]

[0245] in, For the T c The active sampling value of the g-th new energy station at time, For the T c The reactive power sampling value of a new energy station at time g, is the installed capacity of the g-th new energy station.

[0246] No. T c The relationship between the active sampling value and reactive sampling value of the new energy station and the new energy unit at each moment is as follows:

[0247]

[0248] No. T c The active sensitivity information relationship between the new energy station and the new energy unit at any given moment is as follows:

[0249]

[0250] 4-3) Calculate the change in bus voltage during reactive power adjustment of renewable energy generating units in each coordinated control area and the change in bus voltage and transmission section flow during active power adjustment of renewable energy stations.

[0251] Specifically, according to the sensitivity information of the reactive power of the new energy unit to the bus voltage in step 3), the calculation process of the change in bus voltage when the reactive power of the u-th new energy unit in the k-th coordinated control area is adjusted is as follows:

[0252] Set T c The reactive power adjustment of the uth renewable energy unit at the moment is ΔQ u,c , then:

[0253]

[0254] Where, ΔV x,c is the reactive power adjustment ΔQ of u renewable energy units in the kth coordinated control area u,c When , the voltage change of the xth 220kV central busbar.

[0255]

[0256] Where, ΔV y,c is the reactive power adjustment ΔQ of the u-th renewable energy unit in the k-th coordinated control area u,c When , the voltage change of the yth 220kV control busbar.

[0257] According to the sensitivity information of the active power of the new energy station to the bus voltage and the sensitivity information to the power flow of the transmission section in step 3), the calculation process of the change in the bus voltage and the power flow of the transmission section when the active power of the g-th new energy station in the k-th coordinated control area is adjusted is as follows:

[0258] Set T c The adjustment amount of the active power of the g-th new energy station at the moment is ΔP g,c , then:

[0259]

[0260] Where, ΔV x,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the voltage change of the xth 220kV central busbar.

[0261]

[0262] Where, ΔV y,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the voltage change of the yth 220kV control busbar.

[0263]

[0264] Among them, ΔP s,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c The change in active power of the sth transmission section flow at time .

[0265] 5) Based on the result of step 4), the power grid's absorption space and transmission section constraints are comprehensively considered to obtain the ultra-short-term power generation plan of each new energy station in the new energy power grid, and the operating control limit of the bus voltage in the ultra-short term is corrected.

[0266] In this embodiment, according to step 2-1), the update cycle of the new energy ultra-short-term power generation forecast data is 120 minutes. c When the ultra-short-term power generation forecast data of new energy sources is updated, the ultra-short-term power generation plan of new energy stations is calculated. Specifically:

[0267] 5-1) Set the serial number of conventional units (excluding renewable energy units) in the power grid to n, n = 1, ... N, N represents the total number of conventional units in the power grid, and the minimum technical output of the nth conventional unit is

[0268] According to the transaction plan information of the tie line obtained in step 2), the power grid is obtained from the Tth c From time to TN New energy consumption space information Mva at the end of the moment m,t :

[0269]

[0270] Wherein, the subscript m corresponds to D m Day, Load m,c For the T c The total power load power of the power grid at the moment, is the available space for the switching plan of the grid tie line at time t, It is the accumulated value of the minimum technical output of conventional units in the power grid.

[0271] Using the c From time to T N New energy consumption space information Mva at the end of the moment m,t , deduct the Tth c The power exchange power of the grid tie line at the time and the accumulated value of the active power measurement of the whole network new energy station are obtained to obtain the ultra-short-term power grid (from the T c Time to T N Time) New energy available consumption space information ΔMva m,t :

[0272]

[0273] 5-2) Based on the results of step 5-1), comprehensively consider the T c The ultra-short-term power generation plan of the new energy station can be obtained by combining the ultra-short-term available space information of new energy in the power grid at the moment, the ultra-short-term power generation forecast information of the new energy station, and the operation status information of the power grid transmission section.

[0274] In this embodiment, in order to make full use of the available new energy consumption space of the power grid to increase the power generation of new energy stations, a new energy consumption deviation can be constructed. A quadratic programming model for the optimization objective; specifically including:

[0275] Construct the objective function:

[0276]

[0277] Among them, ΔP g is the active power adjustment of the g-th renewable energy station, which is the optimization variable of the function; It represents the deviation between the total available space for accommodating new energy in the power grid and the actual utilization; β is the coefficient of the deviation of the utilization of the accommodating space; W is the active load rate balance index of the new energy station; a and W r are the two weight coefficients of the function.

[0278] Among them, the deviation between the total available space for absorbing new energy in the power grid and the actual utilization Meaning:

[0279]

[0280] in, It is the total amount of additional active power generated by new energy stations across the entire network.

[0281] Active load rate balance index of new energy stations The meaning is:

[0282]

[0283] Among them, R g is the active load rate of the g-th new energy station, R avg is the average active load rate of the new energy stations in the power grid.

[0284] Active load rate R of the g-th renewable energy station in the power grid g :

[0285]

[0286] Average active load rate R of new energy stations in the power grid avg :

[0287]

[0288] Build constraints, including:

[0289] After the active output of new energy stations is adjusted, the power generation capacity constraints must be met:

[0290] and

[0291] The active output of new energy stations must meet the constraints of the power flow control limit of the transmission section:

[0292]

[0293] The total amount of additional active power generated by new energy stations must meet the constraints of the current available power grid consumption space:

[0294]

[0295] In this embodiment, the first part of minimizing the objective function is through ΔP g Adjust the active power output of new energy units to make the total amount of additional active power of new energy stations in the entire network as close as possible to the current available new energy consumption space ΔMva of the power grid m,t ; The second part will be Introducing it into the objective function, on the one hand, ensures the increase of the active power regulation margin of the renewable energy stations, and on the other hand, promotes the active power output of each renewable energy station in the region to develop in a balanced direction, reflecting the goal of ensuring the balance of active power output of renewable energy stations while making the best use of the new energy consumption space.

[0296] 5-3) Using the c Time to T N Ultra-short-term renewable energy generation forecast information at all times and the available power grid absorption space information ΔMva m,t , solve the quadratic programming model of step 5-2) to obtain the active power of the g-th new energy station from the T-th c Time to T N Ultra-short-term plan adjustment information at the moment

[0297]

[0298] Then in the T c At time g, the new energy station starts from T c Time to T N The ultra-short-term active power generation plan information at time

[0299]

[0300] 5-4) According to the ultra-short-term planned adjustment amount information of the active power of the new energy station obtained in step 5-3) and the sensitivity information of the active power of the new energy station to the bus voltage obtained in step 3), the Tth c The maximum voltage fluctuation information of the central bus and control bus in each coordinated control area at all times.

[0301] Specifically, set the T c The ultra-short-term prediction information of the central bus voltage fluctuation in the kth coordinated control area at time is:

[0302]

[0303] Set T c The ultra-short-term prediction information of the control bus voltage fluctuation in the kth coordinated control area at time is:

[0304]

[0305] Traverse separately and The maximum value of the continuous rise and continuous drop of the central bus voltage and the control bus voltage is obtained. The maximum value of the continuous drop is The maximum value of the continuous rise of the control bus voltage is The maximum value of the continuous drop is

[0306] 5-5) In order to maintain the stable operation of the bus voltage, it is necessary to prevent and control the bus voltage fluctuation caused by renewable energy generation in the future. Based on the results of step 5-4), in the data period of this ultra-short-term prediction (from T c Time to T N The operating control limit of the bus voltage is corrected within (time).

[0307] In this embodiment, the operation control limit of the 220kV central bus in the kth coordinated control area is modified to:

[0308]

[0309] in, is the voltage operation control lower limit of the xth central bus in this forecast period, It is the voltage operation control upper limit of the x-th central bus during this forecast period.

[0310] The corrected operating control limit of the 220kV control bus in the kth coordinated control area is:

[0311]

[0312] in, is the voltage operation control lower limit of the y-th control bus in this prediction period, It is the voltage operation control upper limit of the y-th control bus in this prediction period.

[0313] 6) Let the sequence number of the current new energy grid coordination control area k=1.

[0314] 7) Obtain the bus voltage operation status information of the current new energy grid coordinated control area, including:

[0315] No. T c The operating status information of the 220kV central bus voltage in the kth coordinated control area at time is:

[0316]

[0317] No. T c The operating status information of the 220kV control bus voltage in the kth coordinated control area at the moment is:

[0318]

[0319] 8) According to the result of step 7), determine whether it is necessary to perform voltage correction control on the coordinated control area; the specific steps are as follows:

[0320] 8-1) Detect the voltage of X central buses in the current coordinated control area Is there any value that is not in Situation of the interval: if it exists, then mark the coordinated control area as needing to start voltage correction control and go to step 9); if it does not exist, then go to step 8-2).

[0321] 8-2) Detect the voltage of Y control buses in the current coordinated control area Is there any value that is not in Situation of the interval: If it exists, mark the coordinated control area as needing to start voltage correction control and go to step 9); if it does not exist, the reactive output of the new energy station in the coordinated control area of ​​the new energy grid remains unchanged, maintaining the current bus voltage, and then go to step 10).

[0322] 9) Carry out voltage correction control on the current new energy grid coordinated control area.

[0323] In this embodiment, if the T c At the moment when the bus voltage in the kth coordinated control area deviates from the operating control range, it is necessary to adjust the reactive power output of the new energy units in the coordinated control area so that the 220kV central bus voltage of the substation is close to the set target value. And the 220kV control bus voltage of the new energy station is qualified (operating within the upper and lower limits of the operation control). In this embodiment, the method of constructing the CSVC coordinated secondary voltage optimization model is used to illustrate the process of bus voltage correction control in the new energy power grid coordinated control area. The specific steps are as follows:

[0324] 9-1) In order to make the central bus voltage as close to the voltage setting target value as possible, a quadratic programming model with the central bus voltage deviation as the optimization target can be constructed;

[0325] Among them, the objective function of the model is:

[0326]

[0327] Among them, ΔQ u is the reactive power adjustment of the new energy unit, which is the optimization variable of the function; Indicates the deviation between the central bus voltage setting target value and the voltage sampling value; α is the coefficient of bus voltage adjustment deviation; θ u is the reactive power balance index of the new energy unit; W p and W q are the two weight coefficients of the function.

[0328] Set the target value for the central bus voltage, which means:

[0329]

[0330] θ u As a reactive power balance indicator for new energy units, its meaning is:

[0331]

[0332] The constraints of the model include:

[0333] The maximum adjustment step size constraint of the central bus voltage is:

[0334]

[0335] The maximum adjustment step size constraint of the control bus voltage is:

[0336]

[0337] The voltage of the central busbar operates within the control upper and lower limits:

[0338]

[0339] The voltage of the control busbar is controlled within the upper and lower limits:

[0340]

[0341] Reactive power regulation range constraints of new energy units:

[0342]

[0343] The first part of the objective function is minimized by ΔQ u Adjust the reactive power output of the new energy unit to make the voltage of the central bus Get as close to the target value as possible The second part is calculated by u || 2 Introducing it into the objective function, on the one hand, ensures the increase of the reactive power regulation margin of the new energy units, and on the other hand, promotes the reactive power output of each new energy unit in the region to develop in a balanced direction, reflecting the goal of ensuring the reactive power output balance of the new energy units as much as possible while achieving the voltage setting target.

[0344] 9-2) Solve the quadratic programming model constructed in step 9-1) and obtain the Tth c The reactive power adjustment value ΔQ of the uth renewable energy unit at time u,c .

[0345] According to step 3), the sensitivity information of reactive power of new energy units to bus voltage is obtained, and the T c The set value of the 220kV control bus voltage of the yth new energy station in the kth coordinated control area at time

[0346]

[0347] Where, ΔV y,c For the T c The voltage adjustment of the yth control bus in the kth coordinated control area at the moment is calculated by the reactive adjustment and reactive voltage sensitivity of the new energy units topologically associated with the control bus:

[0348]

[0349] 9-3) Set the strategy number of the 220kV control bus setting value generated by the new energy station in the kth coordinated control area to y strg ,y strg =1,……Y strg , Y strg represents the total number of bus control strategies in the kth coordinated control area, then the Tth c The strategy information of controlling the bus voltage setting value in the kth coordinated control area at time as follows:

[0350]

[0351] The strategy number of the control strategy information and the subscript of the control bus are in correspondence. strg Control strategy information for:

[0352]

[0353] in, For the T c The voltage setting value of the yth 220kV control bus at moment y.

[0354] 9-4) The automatic voltage control master station of the power grid sends the T c The voltage setting value instruction of the 220kV control bus at time y is realized c The control strategy for adjusting the voltage of the yth 220kV control bus in the kth coordinated control area at time; after the new energy station substation receives the adjustment target value of the yth control bus voltage, it adjusts the reactive output of the new energy unit to make the 220kV bus voltage as close as possible to the bus voltage set value issued by the master station.

[0355] In general, by adjusting the Tc At the kth coordinated control area, the reactive power output of the new energy units in the area is used to adjust the voltage of each control bus. On the one hand, the voltage of the 220kV control bus in the area is operated within the qualified range. On the other hand, the voltage of the 220kV central bus in the area is close to its optimized target value, thereby achieving the Tth coordinated control area. c The target of bus voltage correction control in the kth coordinated control area at time.

[0356] 10) Let k=k+1, select the next new energy grid coordinated control area as the new current coordinated control area, and then return to step 7) until the reactive voltage control process of K coordinated control areas in the new energy grid is completed in this control cycle, and then enter step 11).

[0357] 11) The current time after control is completed is recorded as T' c , and obtain the new energy grid at the first T' c The running status information F' at the moment m,c :

[0358]

[0359] Among them, the superscript ' corresponds to the T' c time, For the power grid control model, at T' c Status information at all times.

[0360] No. T' c The information of the central bus and control bus in the kth coordinated control area at time is:

[0361]

[0362] in, For T' c Central bus information in the kth coordinated control area at time, For T' c The control bus information in the kth coordinated control area at the moment. Among them, For T' c Central bus information in the kth coordinated control area at time, For T' c The control bus information in the kth coordinated control area at the moment; The xth central bus is at T' c The voltage sampling value at the moment, The xth central bus is at T' c The voltage operation control lower limit value at the moment, The xth central bus is at T' c The voltage operation control upper limit at the moment; The yth control bus is at T' c The voltage sampling value at the moment, The yth control bus is at T' c The voltage operation control lower limit value at the moment, The yth control bus is at T' c The voltage operation control upper limit at the moment.

[0363] Among them, in the T' c The xth 220kV central bus voltage sampling value information at time for:

[0364]

[0365] In T' c The sampling value information of the yth 220kV control bus voltage for:

[0366]

[0367] No. T' c The information of the new energy unit in the kth coordinated control area at time is:

[0368]

[0369] in, For T' c Reactive sampling value information of the new energy unit in the kth coordinated control area at time.

[0370]

[0371] 12) At the next control cycle of the new energy grid automatic voltage control, c+1 At this moment, c+1 Moment as the new T c At this moment, first, repeat step 2) to obtain the new T c The ultra-short-term power generation forecast information of new energy sources, the operation status information of the transmission section, and the trading plan information of the tie line at the time; then, repeat step 3) to obtain the new T c The sensitivity information of the new energy unit to the bus voltage and the transmission section flow at the moment; Finally, the new energy grid of step 9) is c The running status information at time T is used as the new c The grid initial operation status information at time D is obtained, and the process returns to step 4) to complete a new round of reactive power voltage control process of the new energy grid until the new energy grid is realized on date D m Reactive voltage control process within each control cycle.

Claims

1. A reactive voltage control method for a new energy collection area considering power generation trends, characterized in that: include: 1) The 500kV substation with a lower-level 220kV new energy station in the new energy gathering area is marked as the new energy grid coordinated control area, and all new energy grid coordinated control areas constitute the coordinated control area model of the new energy grid; 2) At the beginning of each control cycle in the automatic voltage control, obtaining new energy ultra-short-term power generation forecast information, transmission section operation status information and tie line transaction plan information of the new energy grid; 3) Based on the coordinated control area model of the new energy power grid, the sensitivity information of the new energy generating unit to the bus voltage and the transmission section flow at the starting time is obtained; 4) Based on the results of steps 2) and 3), the initial operation state information of the power grid at the start time is obtained, and then the change in bus voltage during reactive power adjustment of each new energy generating unit in the new energy power grid coordinated control area and the change in bus voltage and transmission section flow during active power adjustment of the new energy station are calculated; 5) Based on the result of step 4), the ultra-short-term power generation plan of each new energy station in the new energy power grid is obtained, and then the operation control limit of the bus voltage in the ultra-short term is corrected; 6) Based on the bus voltage operation status information of the new energy grid coordinated control area at the start time, combined with the operation control limit of the bus voltage within the ultra-short-term prediction period, the bus voltage correction control of the new energy grid coordinated control area is performed; The coordinated control area model expression of the new energy grid is as follows: Where K represents the total number of coordinated control areas in the renewable energy grid; is the kth coordinated control area; in, The information of the 220kV busbar of the xth substation in the kth coordinated control area is: is the information of the 220kV busbar of the yth new energy station in the kth coordinated control area, is the information of the u-th renewable energy station unit in the k-th coordinated control area, The information of the g-th new energy station in the k-th coordinated control area; The obtaining of new energy ultra-short-term power generation forecast information, transmission section operation status information and tie line transaction plan information of the new energy power grid includes: 2-1) Let the start time of the current control cycle be T c , let the serial number of the new energy station in the kth coordinated control area be g, g = 1, ... G, G represents the total number of new energy stations in the coordinated control area, the Tth c The ultra-short-term forecast information of renewable energy power generation in the coordinated control area at this moment is: Among them, Pre k,c Indicates the T c The ultra-short-term power generation forecast information of renewable energy in the kth coordinated control area at time T. c time, For the g-th new energy station in the T c Ultra-short-term power generation forecast information at all times; Wherein, the subscript t corresponds to the sampling time of ultra-short-term power generation forecast, is the predicted active power value of the g-th renewable energy station at the t-th sampling time, and the T-th c Time is the starting time of sampling, the Tth N Time is the end time of sampling; 2-2) Let the serial number of the transmission section in the new energy grid be s, s = 1, ... S, S represents the total number of transmission sections in the grid, and the grid is in the Tth c The transmission section operation status information at the moment is Sanp c : in, is the sth transmission section at the Tth c The active sampling value at the moment, is the lower limit of the operation control of the sth transmission section, is the upper limit of the operation control of the sth transmission section; 2-3) Let the grid tie line be at T c The running status information at this moment is Tie c : in, For the contact line at T c The active sampling value at the moment, For the contact line at D m Trading plan information for the day, Control dead zone for active power transaction of tie line; Then the grid tie line starts from T c From time to T N The transaction plan information at the end of time is in, is the planned active power value of the grid tie line at the tth sampling time; The obtaining of the sensitivity information of the new energy generating unit to the bus voltage and the transmission section flow at the starting time includes: Let the serial number of the new energy generating unit in the kth coordinated control area be u, u=1,...U, and U represents the total number of new energy generating units in the coordinated control area; Then the new energy units and stations in the kth coordinated control area are c The sensitivity information at this moment is Sens k,c : in, For the T c The sensitivity information of reactive power of the new energy generating unit in the kth coordinated control area to the bus voltage at the moment; For the T c The sensitivity information of the active power of the new energy unit in the kth coordinated control area to the bus voltage; For the T c The sensitivity information of the active power of the new energy units in the kth coordinated control area to the section power flow, For the T c The sensitivity information of the active power of the new energy station in the kth coordinated control area to the bus voltage; in, in, For the T c The sensitivity information of the reactive power of the u-th renewable energy unit to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the reactive power of the u-th renewable energy unit to the y-th renewable energy station 220kV control bus voltage; in, For the T c The sensitivity information of the active power of the u-th renewable energy unit to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the active power of the u-th renewable energy unit to the y-th renewable energy station 220kV control bus voltage; in, For the T c The active power of the u-th renewable energy unit at the moment is a collection of the sensitivity information of the power flow of a total of S transmission sections in the power grid; For the T c The sensitivity information of the active power of the u-th renewable energy unit to the power flow of the s-th transmission section in the power grid; in, For the T c The sensitivity information of the active power of the g-th new energy station to the 220kV central bus voltage of the x-th substation; For the T c The sensitivity information of the active power of the g-th renewable energy station to the y-th renewable energy station 220kV control bus voltage; For the T c The active power of the g-th renewable energy station at the moment is a collection of the sensitivity information of the power flow of a total of S transmission sections in the power grid; For the T c The sensitivity information of the active power of the g-th renewable energy station to the power flow of the s-th transmission section in the power grid; The method further comprises: 4-1) Obtaining new energy grid in the T c Initial operation status information F at time m,c : Among them, Sanp c For the T c The operating status information of the transmission section in the power grid at all times, Tie c For the T c Operation status information of tie lines in the power grid at all times; 4-2) According to the result of step 4-1), obtain the Tth c The operating status at the moment; Among them, for the kth new energy grid coordination control area, it includes: Let the serial number of the 220kV central busbar in the kth coordinated control area be x, x = 1, ... X, X represents the total number of 220kV central busbars in the kth coordinated control area, c Initial state information of 220kV central bus in the kth coordinated control area at time for: in, The xth central bus is at the T c The voltage sampling value at the moment, The xth central bus is at the T c The voltage operation control lower limit value at the moment, The xth central bus is at the T c The voltage operation control upper limit value at the moment; the serial number of the 220kV control bus in the kth coordinated control area is set to y, y = 1, ... Y, Y represents the total number of 220kV control buses in the kth coordinated control area, the Tth c Initial state information of 220kV control bus in the kth coordinated control area at time for: in, The yth control bus is at the Tth c The voltage sampling value at the moment, The yth control bus is at the Tth c The voltage operation control lower limit value at the moment, The yth control bus is at the Tth c The voltage operation control upper limit at time T; the new energy unit in the kth coordinated control area at time T c Initial state information at the moment for: in, For the T c The active sampling value of the u-th renewable energy unit at time, For the T c The reactive sampling value of the u-th renewable energy unit at time, The minimum reactive power output of the u-th renewable energy unit, is the maximum reactive power output of the u-th renewable energy unit, is the installed capacity of the u-th renewable energy unit, Bs u is the 220kV control busbar index corresponding to the u-th renewable energy unit, Gen u Subscribe the station corresponding to the u-th new energy unit; The kth coordinated control area new energy station is located in the Tth c Initial state information at the moment for: in, For the T c The active sampling value of the g-th new energy station at time, For the T c The reactive power sampling value of the new energy station at time g, is the installed capacity of the g-th new energy station; No. T c The relationship between the active sampling value and reactive sampling value of the new energy station and the new energy unit at each moment is as follows: No. T c The active sensitivity information relationship between the new energy station and the new energy unit at any given moment is as follows: 4-3) Calculate the change in bus voltage during reactive power adjustment of renewable energy generating units in each coordinated control area and the change in bus voltage and transmission section power flow during active power adjustment of renewable energy stations; Among them, for the change in bus voltage during reactive power adjustment of the u-th renewable energy unit in the k-th coordinated control area, the calculation process is as follows: Set T c The reactive power adjustment of the uth renewable energy unit at the moment is ΔQ u,c , then: Where, ΔV x,c is the reactive power adjustment ΔQ of u renewable energy units in the kth coordinated control area u,c When , the voltage change of the xth 220kV central busbar; Where, ΔV y,c is the reactive power adjustment ΔQ of the u-th renewable energy unit in the k-th coordinated control area u,c When , the voltage change of the yth 220kV control bus; The calculation process for the changes in bus voltage and transmission section power flow when the active power of the g-th renewable energy station in the k-th coordinated control area is adjusted is as follows: Set T c The adjustment amount of the active power of the g-th new energy station at the moment is ΔP g,c , then: Where, ΔV x,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the voltage change of the xth 220kV central busbar; Where, ΔV y,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the voltage change of the yth 220kV control bus; Among them, ΔP s,c is the active power adjustment ΔP of the g-th renewable energy station in the k-th coordinated control area g,c When , the active power change of the sth transmission section power flow; The method further comprises: 5-1) Assume that the serial number of the conventional units in the power grid is n, n = 1, ... N, N represents the total number of conventional units in the power grid, and the minimum technical output of the nth conventional unit is Note that the power grid starts from T c From time to T N New energy consumption space information Mva at the end of the moment m,t for: Among them, Load m,c For the T c The total power load power of the power grid at the moment, is the available space for the switching plan of the grid tie line at time t, It is the accumulated value of the minimum technical output of conventional units in the power grid; Then the available space information of ultra-short-term renewable energy consumption in the power grid is ΔMva m,t : 5-2) Construct a new energy source to absorb the deviation A quadratic programming model for the optimization objective; specifically including: Construct the objective function: Among them, ΔP g is the active power adjustment amount generated by the g-th new energy station; It represents the deviation between the total available space for accommodating new energy in the power grid and the actual utilization; β is the coefficient of the deviation of the utilization of the accommodating space; W is the active load rate balance index of the new energy station; a and W r is the weight coefficient; in, in, The total amount of additional active power generated by new energy stations across the entire network; Among them, R g is the active load rate of the g-th new energy station, R avg is the average active load rate of the new energy stations in the power grid; Build constraints, including: After the active output of new energy stations is adjusted, the power generation capacity constraints must be met: and The active output of new energy stations must meet the constraints of the power flow control limit of the transmission section: The total amount of additional active power generated by new energy stations must meet the constraints of the current available power grid consumption space: 5-3) Solve the quadratic programming model of step 5-2) to obtain the active power of the g-th renewable energy station from the T-th c Time to T N Ultra-short-term plan adjustment information at the moment Then in the T c At time g, the new energy station starts from T c Time to T N The ultra-short-term active power generation plan information at time 5-4) Based on the result of step 5-3), the Tth c The maximum voltage fluctuation information of the central bus and control bus in each coordinated control area at any time; Among them, let T c The ultra-short-term prediction information of the central bus voltage fluctuation in the kth coordinated control area at time is: Let T c The ultra-short-term prediction information of the control bus voltage fluctuation in the kth coordinated control area at time is ΔV c y : Traverse separately and The maximum value of the continuous rise and continuous drop of the central bus voltage and the control bus voltage is obtained; the maximum value of the continuous rise of the central bus voltage is recorded as The maximum value of the continuous drop is The maximum value of the continuous rise of the control bus voltage is The maximum value of the continuous drop is 5-5) Based on the result of step 5-4), the operation control limit of the bus voltage is corrected within this ultra-short-term prediction period; Among them, the modified operation control limit of the 220kV central bus in the kth coordinated control area is: in, is the voltage operation control lower limit of the xth central bus in this forecast period, is the voltage operation control upper limit of the xth central bus in this forecast period; The corrected operating control limit of the 220kV control bus in the kth coordinated control area is: in, is the voltage operation control lower limit of the yth control bus in this prediction period, It is the voltage operation control upper limit of the y-th control bus in this prediction period.

2. The method according to claim 1, characterized in that The performing bus voltage correction control on the new energy grid coordinated control area includes: 6-1) Obtain the bus voltage operation status information of the current new energy grid coordinated control area, including: No. T c The operating status information of the 220kV central bus voltage in the kth coordinated control area at time is: No. T c The operating status information of the 220kV control bus voltage in the kth coordinated control area at the moment is: 6-2) According to the result of step 6-1), determine whether it is necessary to perform voltage correction control on the coordinated control area; the specific steps are as follows: 6-2-1) Detect the voltage of X central buses in the current coordinated control area Is there any value that is not in Situation of the interval: if it exists, then mark the coordinated control area as needing to start voltage correction control and go to step 6-3); if it does not exist, then go to step 6-2-2); 6-2-2) Detect the voltage of Y control buses in the current coordinated control area Is there any value that is not in Situation of the interval: if it exists, it is marked that the coordinated control area needs to start voltage correction control and go to step 6-3); if it does not exist, the reactive power output of the new energy station in the coordinated control area remains unchanged and the current bus voltage is maintained; 6-3) Construct a quadratic programming model with the central bus voltage deviation as the optimization target; Among them, the objective function of the model is: Among them, ΔQ u It is the reactive power adjustment of the new energy unit; Indicates the deviation between the central bus voltage setting target value and the voltage sampling value; α is the coefficient of bus voltage adjustment deviation; θ u is the reactive power balance index of the new energy unit; W p and W q is the weight coefficient; To set a target value for the central bus voltage: The constraints of the model include: The maximum adjustment step size constraint of the central bus voltage is: The maximum adjustment step size constraint of the control bus voltage is: The voltage of the central busbar operates within the control upper and lower limits: The voltage of the control busbar is controlled within the upper and lower limits: Reactive power regulation range constraints of new energy units: Solve the quadratic programming model and get the Tth c The reactive power adjustment value ΔQ of the uth renewable energy unit at time u,c ; 6-4) Based on the result of step 6-3), calculate the Tth c The set value of the 220kV control bus voltage of the yth new energy station in the kth coordinated control area at time Where, ΔV y,c For the T c The adjustment amount of the yth controlled bus voltage in the kth coordinated control area at the moment: 6-5) Let the strategy number of the 220kV control bus setting value generated by the new energy station in the kth coordinated control area be y strg ,y strg =1,……Y strg , Y strg represents the total number of bus control strategies in the kth coordinated control area, then the Tth c The strategy information of controlling the bus voltage setting value in the kth coordinated control area at time as follows: yth strg Control strategy information for: in, For the T c The voltage setting value of the yth 220kV control bus at time; 6-6) The main station of automatic voltage control of the power grid sends the T c The voltage setting value instruction of the 220kV control bus at time y is realized c At time k, the yth line of the kth coordinated control area controls the bus voltage adjustment.

3. The method according to claim 2, characterized in that The method further comprises: The current time after all coordinated control areas complete reactive power and voltage control in the current control cycle is recorded as T' c , and obtain the new energy grid at the first T' c The running status information F' at the moment m,c : Among them, the superscript ' corresponds to the T' c time, For the power grid control model, at T' c Status information at all times; No. T' c The information of the central bus and control bus in the kth coordinated control area at time is: in, For T' c Central bus information in the kth coordinated control area at time, For T' c The control bus information in the kth coordinated control area at the moment; The xth central bus is at T' c The voltage sampling value at the moment, The xth central bus is at T' c The voltage operation control lower limit value at the moment, The xth central bus is at T' c The voltage operation control upper limit at the moment; The yth control bus is at T' c The voltage sampling value at the moment, The yth control bus is at T' c The voltage operation control lower limit value at the moment, The yth control bus is at T' c The voltage operation control upper limit at the moment; Among them, in the T' c The xth 220kV central bus voltage sampling value information at time for: In T' c The sampling value information of the yth 220kV control bus voltage for: No. T' c The information of the new energy unit in the kth coordinated control area at time is: in, For T' c Reactive sampling value information of the new energy unit in the kth coordinated control area at the moment; In the automatic voltage control, the next control cycle will arrive at the Tth c+1 At this moment, c+1 Moment as the new T c At this moment, the new energy grid will be at T' c The running status information at time T is used as the new c The initial operation status information of the power grid is obtained at every moment, and a new round of reactive power and voltage control process of the new energy power grid begins.

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