A method and system for coordinated switching of reactive sources with time-sequential progression

Abstract

The present invention discloses a method and system for coordinated switching of reactive sources with progressive timing, the method comprising: calculating the reactive quota of a single new energy station where the reactive source is located according to a quarterly factor and a diurnal factor; calculating the distribution timing quantization value of each reactive source, and sorting them to obtain a reactive distribution timing of multiple new energy stations, including reactive source attribution, distribution timing quantization value and switching timing; replacing the distribution timing quantization value in the reactive distribution timing of multiple new energy stations with the corresponding reactive quota, and obtaining the final reactive distribution timing of multiple new energy stations; selecting a progressive control strategy according to specific working conditions, and sequentially performing the switching operation of the corresponding reactive source according to the final reactive distribution timing of multiple new energy stations. The present invention can realize efficient management and coordinated control of reactive power of a regional high-proportion new energy power grid, thereby improving the operation efficiency and reliability of the power grid.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy regulation, and relates to a method and system for coordinated switching of reactive sources with progressive timing. Background Art

[0002] With the transformation of the global energy structure and the increasing requirements for environmental protection, the development and utilization of new energy has become an important part of the national energy strategy. The rapid development of new energy, especially renewable energy such as wind and solar energy, has provided an effective way to solve the energy crisis and reduce environmental pollution. However, due to the intermittent, volatile and unpredictable characteristics of these energy sources, they have brought certain challenges to the stable operation of the power system. Especially in the case of a high proportion of new energy connected to the grid, how to effectively manage and regulate reactive power to ensure the stability of the power grid and the quality of power has become a technical problem that needs to be solved urgently.

[0003] In the power system, reactive power management plays a vital role in maintaining voltage stability, reducing transmission losses, and improving system transmission efficiency. Traditional reactive power regulation methods mainly rely on adjusting the excitation system of the generator, switching reactive compensation devices such as phase regulators and static VAR generators (SVG), and reactive power regulation equipment of transmission lines. However, these methods often fail to meet the needs of fast and efficient regulation in the complex power grid environment with a high proportion of renewable energy connected to the grid, and fail to fully utilize the potential of renewable energy power generation.

[0004] With the development of smart grid technology, the operation and dispatch of power grids tend to be more intelligent and automated. In this context, researching and developing a reactive source sequential progressive coordinated switching strategy that can adapt to the high proportion of new energy grid-connected environment has important practical significance and application value. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a method and system for coordinated switching of reactive sources with time progression, which fully considers factors such as source-load uncertainty, reactive resource configuration, and real-time operation of the power grid, and realizes efficient management and coordinated control of reactive power of a regional high-proportion new energy power grid by optimizing the configuration and regulation strategy of reactive power, thereby improving the operating efficiency and reliability of the power grid.

[0006] The present invention adopts the following technical solution.

[0007] A first aspect of the present invention provides a method for coordinated switching of reactive sources with progressive timing, comprising:

[0008] Step 1: Calculate the final reactive power quota of the single renewable energy station where the reactive power source is located based on the quarterly factor and the diurnal factor;

[0009] Step 2: Calculate the distribution timing quantization value of each reactive power source and sort them to obtain the reactive power distribution timing of multiple renewable energy stations, including reactive power source ownership, distribution timing quantization value and switching timing;

[0010] Step 3: Replace the allocation time sequence quantization value in the new energy multi-station reactive power allocation time sequence described in step 2 with the corresponding reactive power quota obtained in step 1 to obtain the final new energy multi-station reactive power allocation time sequence;

[0011] Step 4: Select a progressive control strategy according to the specific working conditions, and perform the switching operations of the corresponding reactive sources in sequence according to the final reactive power distribution sequence of the new energy multi-station obtained in step 3.

[0012] Preferably, in step 1, the calculation formula for the reactive power quota of the single renewable energy station where the reactive power source is located is:

[0013] Q i0 =λ s ·ρ d Q i (1)

[0014] In the formula, Q i0 is the final reactive power rating of the renewable energy single station where reactive power source i is located, λ s is the quarterly factor, ρ d is the diurnal factor, λ s , ρ d ∈[0, 1], Q i is the reactive power allocation increment of reactive power source i.

[0015] Preferably, the reactive power allocation increment Q of reactive power source i is i for:

[0016] Q i =lk i (Qr es_i ±δ i ) (2)

[0017] In the formula, lk i is the blocking state of reactive source i, Q res_i is the reactive power demand increment of reactive power source i, δ i is the margin threshold of reactive power source i.

[0018] Preferably, in step 2, the calculation formula of the distribution timing quantization value of each reactive source is:

[0019]

[0020] In the formula, Ts i is the distribution time series quantization value of reactive power source i; N is the total number of reactive power sources in the new energy station;

[0021] ωs ,ω sn ,ω t ,ω w They are voltage sensitivity weight, branch sensitivity weight, response speed weight, and weight value weight;

[0022] S i is the voltage sensitivity of reactive source i; SN i is the branch sensitivity of reactive source i; T i is the response speed of reactive source i; W i is the weight of reactive source i; CL i is the number of adjustments of reactive source i.

[0023] Preferably, the voltage sensitivity S of the reactive source i is i for:

[0024]

[0025] Where ΔQ i is the reactive power regulation of reactive power source i, ΔV ij is the magnitude of the voltage impact of reactive source i on compensation node j after adjustment alone;

[0026] Branch sensitivity SN of reactive source i i for:

[0027] SN i =Q i / L ij (7)

[0028] L ij =N ij ·l ij

[0029] In the formula, Q i is the reactive power distribution increment of reactive power source i, L ij is the generalized distance between reactive source i and compensation node j, l ij is the physical distance between reactive source i and compensation node j, N ij is the number of voltage levels spanned between compensation node j and reactive source i;

[0030] The response speed T of reactive source i i for:

[0031] T i =t i1 +t i2 +t i3 (8)

[0032] Where, t i1 is the transmission time of the instruction, expressed as c·l ijDescription, c is the speed of light; t i2 and t i3 They are the station internal command processing time and reactive equipment action preparation time;

[0033] The weight W of reactive source i i for:

[0034]

[0035] Where n i_s is the number of successful times that reactive power source i participated in regulation in the past, N i_t is the total number of times reactive source i participated in regulation in the past.

[0036] Preferably, the adjustment times CL of reactive source i is i for:

[0037] CL i =lk i ·(N cl_i -n cl_i ) (10)

[0038] In the formula, lk i Whether the reactive power source i needs to consider the number of times limit, which is 0 or 1, indicating that it does not need to be considered or the number of times limit needs to be considered respectively; n cl_i is the number of times reactive power source i has been used on that day, N cl_i The upper limit of the number of adjustments of reactive power source i on the day.

[0039] Preferably, in step 4, a progressive control strategy is selected according to specific working conditions, specifically including:

[0040] For switching or replacement between continuous reactive sources, a sigmoid progressive control strategy is adopted;

[0041] For the replacement from discrete reactive source to continuous reactive source, a hierarchical progressive control strategy is adopted;

[0042] For reactive power switching under voltage mutation conditions, a binary progressive control strategy or a hierarchical progressive control strategy is adopted;

[0043] For seasonal and day-night switching, a sigmoid progressive control strategy is adopted.

[0044] Preferably, the binary progressive control strategy is:

[0045]

[0046] Where D r is the state value of the rth progressive control, r∈(1,N), N is the number of progressive times, D r+1 It is the state value of the r+1th progressive control.

[0047] Preferably, the Sigmoid progressive control strategy is:

[0048]

[0049] Where D ini is the current state value; D boj is the target value, and its value is the reactive power distribution sequence Q of multiple renewable energy stations Ts The reactive power value Q i0 ;D r is the state value of the rth progressive control.

[0050] Preferably, the hierarchical progressive control strategy is:

[0051]

[0052] In the formula, N is the number of steps, D ini is the current state value, D boj is the target value, and its value is the reactive power distribution sequence Q of multiple renewable energy stations Ts The reactive power value Q i0 ;D r is the state value of the rth progressive control.

[0053] Preferably, in step 4, the progressive control strategy is based on the final renewable energy multi-station reactive power distribution timing Q obtained in step 3. Ts The ownership and switching sequence of reactive power sources are based on Q Ts The reactive power quota Q of the new energy single station where the reactive power source is located i0 To progressively control the target value, the state value control sequence {D1, D2, ...D r …, D N}, the corresponding reactive source switching operation is performed with the state value control sequence until ∑ N D r =Q i0 .

[0054] A second aspect of the present invention provides a time-sequentially progressive reactive source coordinated switching system, comprising:

[0055] A calculation module is used to calculate the final reactive power quota of a single renewable energy station where the reactive power source is located based on the quarterly factor and the diurnal factor;

[0056] A sorting module is used to calculate the distribution timing quantization value of each reactive power source and sort them to obtain the reactive power distribution timing of multiple renewable energy stations, including reactive power source ownership, distribution timing quantization value and switching timing; the distribution timing quantization value in the reactive power distribution timing of multiple renewable energy stations is replaced with the corresponding reactive power quota to obtain the final reactive power distribution timing of multiple renewable energy stations;

[0057] The switching module is used to select the progressive control strategy according to the specific working conditions, and to perform the switching operations of the corresponding reactive sources in sequence according to the final reactive power distribution sequence of the new energy multi-station.

[0058] A terminal comprises a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0059] A computer-readable storage medium stores a computer program, which implements the steps of the method when executed by a processor.

[0060] Compared with the prior art, the beneficial effects of the present invention are at least:

[0061] The present invention considers more comprehensive external factors in three aspects: reactive switching increment, reactive increment execution mode and reactive source execution sequence:

[0062] 1) In terms of reactive power switching increment, seasonal and day-night characteristic factors of different renewable energy sources are added to fully consider the reactive power output characteristics of renewable energy stations in the corresponding time period, avoid hidden dangers caused by the uncertainty of reactive power adjustable quantity, so as to provide early warning and reduce dispatching pressure;

[0063] 2) In terms of reactive power increment execution mode, unlike the traditional one-step or equal-step adjustment mode, the present invention fully considers the curve characteristics of different working conditions and adopts three progressive methods for adjustment, so that the voltage curve transition is smoother and the voltage quality level is significantly improved;

[0064] 3) In terms of reactive source execution timing, unlike the traditional method of only considering a few devices and technical factors, the present invention fully coordinates all adjustable devices, considers a variety of external and technical factors (such as the adjustable amount of reactive equipment, voltage sensitivity, branch sensitivity, response speed, locking state, adjustment number limit, weight), and determines the execution timing value of each reactive source by evaluating the benefits that can be brought by all adjustable devices under the current working conditions (so that the voltage reaches the voltage regulation target to the greatest extent), thereby avoiding the waste of reactive resources and fully coordinating and optimizing the management and configuration of each reactive source. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a flow chart of the method for the sequential progressive coordinated switching of reactive sources containing a high proportion of new energy;

[0066] Figure 2 This is a schematic diagram of the electrical connections of the new energy station. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0068] like Figure 1 As shown, Embodiment 1 of the present invention provides a method for coordinated switching of reactive sources with a high proportion of new energy in a sequential manner, so as to coordinate reactive resource allocation between different reactive sources within stations with a high proportion of new energy, optimize reactive allocation strategy, and improve voltage quality, which specifically includes the following steps:

[0069] Step 1: Calculate the final reactive power quota of the single renewable energy station where the reactive power source is located based on the quarterly factor and the diurnal factor. The calculation formula is:

[0070] Q i0 =λ s ·ρ d Q i (1)

[0071] In the formula, Q i0 is the reactive power quota finally determined by the single renewable energy station where reactive power source i is located, λ s is the quarterly factor, ρ d is the diurnal factor, Q i is the reactive power distribution increment of reactive power source i, λ s , ρ d ∈[0, 1]; reactive power source is reactive power regulation equipment, such as wind power, photovoltaic inverter, capacitor bank reactor;

[0072] λ s The value of is determined in advance based on the historical and average values ​​of rated output ratio in each quarter, s∈(spr,sum,aut,wtr);λ spr , sum , aut , wtr represents the spring factor, summer factor, autumn factor and winter factor respectively; for example, for wind power: spr =0.65,λ sum =0.3,λ aut =0.5,λ wtr =0.8.

[0073] ρ d The value range can be set according to the output ratio of different days and nights, d∈(day,ngt); ρ day , ngtRepresents the day factor and night factor respectively. For example, for wind power: Spring: ρ day =0.65,ρ ngt =0.7; Summer: ρ day =0.3,ρ ngt =0.2; Autumn: ρ day =0.5,ρ ngt =0.5; Winter: ρ day =0.8,ρ ngt =0.8.

[0074] Reactive power distribution increment Q of reactive power source i i :

[0075] Q i =lk i (Q res_i ±δ i ) (2)

[0076] In the formula, i is the reactive power regulation equipment; lk i It is the locked state, and its value is 0 or 1 (0 means locked); Q res_i is the reactive power demand increment, δ i is the margin threshold; in specific implementation, each station sends relevant data to the database, and then the system reads Q from the database res_i value; when the reactive power source is turned on, the “±” in the formula is “+”, and when the reactive power source is turned off, the “±” in the formula is “-”.

[0077] Step 2: Calculate the distribution timing quantization value of each reactive power source and sort them to obtain the reactive power distribution timing of multiple renewable energy stations, including reactive power source ownership, distribution timing quantization value and switching timing;

[0078] After obtaining the distribution timing quantization value of each reactive power source according to formula (3), the sorting function sort() of formula (4) is used to sort them by size to obtain the distribution timing Ts,

[0079] Step 3: Replace the allocation time sequence quantization value in the new energy multi-station reactive power allocation time sequence described in step 2 with the corresponding reactive power quota obtained in step 1 to obtain the final new energy multi-station reactive power allocation time sequence;

[0080] Specifically, the reactive power distribution time sequence Q of multiple renewable energy stations can be obtained by integrating formula (5): Ts , that is, Ts in the Ts sequence i Replace with Q i0 , get Q Ts Timing.

[0081] The calculation formula for the distribution timing quantization value of reactive source i is:

[0082]

[0083] Ts=sort(Ts i , i=1,2,...N) (4)

[0084] Q Ts = {q Ts} (5)

[0085] In the formula, Q Ts It is the reactive power distribution sequence for multiple renewable energy stations, including reactive power source ownership, Q i0 and switching timing;

[0086] Reactive source ownership represents the reactive source that needs to be switched, Q i0 Reactive power increment represents the reactive power that the corresponding reactive source needs to emit or absorb. The switching sequence represents the order in which the corresponding reactive source participates in a certain voltage regulation process.

[0087] q Ts Elements representing specific reactive power sources and switching amounts (reactive power increments);

[0088] Ts is the allocation timing, Ts i is the distribution timing quantization value of reactive source i;

[0089] N is the number of reactive power sources in the new energy station; ω s ,ω sn ,ω t ,ω w They correspond to voltage sensitivity weight, branch sensitivity weight, response speed weight, and weight value weight respectively. The default values ​​are all 1. Values ​​can be taken according to the importance of different parameters. The larger the value, the greater the weight, and the higher the priority will be under the same conditions.

[0090] S i is the voltage sensitivity of reactive source i; SN i is the branch sensitivity of reactive source i; T i is the response speed of reactive source i; W i is the weight of reactive source i; CL i is the number of times reactive source i is adjusted. The details are as follows:

[0091] Voltage sensitivity S i :

[0092]

[0093] Where ΔQ i is the reactive power regulation of reactive power source i, ΔV ij It is the magnitude of the voltage impact of a single reactive source i on the compensation node j after adjustment.

[0094] Branch sensitivity SNi :

[0095] SN i =Q i / L ij (7)

[0096] L ij =N ij ·l ij

[0097] Where, L ij is the generalized distance between reactive power regulation device i (reactive power source i) and compensation node j, l ij is the physical distance between reactive power regulation device i and compensation point j, N ij is the number of voltage levels spanned between compensation node j and reactive source i.

[0098] Response speed T i :

[0099] T i =t i1 +t i2 +t i3 (8)

[0100] Where, t i1 is the transmission time of the instruction, expressed as c·l ij Description, c is the speed of light;

[0101] t i2 and t i3 They are the station internal command processing time and reactive equipment action preparation time, respectively. The values ​​can be read directly from the station database and are configurable parameters. The sum of these two parameters may be between several hundred milliseconds and several seconds, depending on the corresponding device type and design.

[0102] Weight W i :

[0103]

[0104] Where n i_s N is the number of successful adjustments that device i has participated in in the past. i_t The total number of times device i has participated in adjustments in the past; the past refers to the time from the start of the last adjustment to the time when the number of adjustments is reset to zero, such as one month.

[0105] Adjustment times CL i :

[0106] CL i =lk i ·(N cl_i -n cl_i ) (10)

[0107] In the formula, lk i Whether device i needs to consider the number of times limit, which can be 0 or 1, indicating that it does not need to be considered or needs to be considered. cl_i is the number of times used on that day, N cl_i The upper limit of the number of adjustments that can be made to device i on the same day.

[0108] Step 4: Select a progressive control strategy according to the specific working conditions, and perform the switching operations of the corresponding reactive sources in sequence according to the final reactive power distribution sequence of the new energy multi-station obtained in step 3.

[0109] Further preferably, the progressive control strategy and its selection method are as follows:

[0110] Binary progressive control strategy

[0111]

[0112] Where D r is the state value of the rth progressive control, r∈(1,N), N is the set number of binary divisions, D r+1 It is the state value of the r+1th progressive control.

[0113] Sigmoid progressive control strategy

[0114]

[0115] Where D ini is the current state value, D boj is the target value, and its value is the reactive power distribution sequence Q of multiple renewable energy stations Ts The reactive power value Q i0 , D r is the state value of the rth progressive control. Ts = {Spv1 = 36, Sw2 = 54, PV1 = 180, ...} When Spv1 is adjusted, then D of formula (12) boj That is 36.

[0116] Hierarchical control strategy

[0117]

[0118] In the formula, N is the number of steps, D ini is the current state value, D boj is the target value, and its value is the reactive power distribution sequence Q of multiple renewable energy stations Ts The reactive power value Q i0 , D r is the state value of the rth progressive control.

[0119] The above formulas (1)-(2) fully consider the uncertainty of source and load, formulas (1)-(7), (9)-(13) fully consider the reactive resource allocation, and formulas (8), (11)-(13) fully consider the real-time operation of the power grid. On this basis, by optimizing the configuration and regulation strategy of reactive power, efficient management and coordinated control of the reactive power of the regional high-proportion new energy power grid can be achieved, thereby improving the operation efficiency and reliability of the power grid.

[0120] Choice of progressive control strategy:

[0121] For switching or replacement between continuous reactive sources, a sigmoid progressive control strategy is adopted;

[0122] For the replacement from discrete reactive source to continuous reactive source, a hierarchical progressive control strategy is adopted;

[0123] For reactive power switching under conditions of large voltage changes, a binary progressive control strategy or a hierarchical progressive control strategy is adopted;

[0124] For seasonal and day-night switching, a sigmoid progressive control strategy is adopted.

[0125] It can be understood that for each progressive control strategy, the initial state value is the reactive power output value of the current device, and the final target value is Q i0 .

[0126] Reactive source switching is performed according to the selected sequential progressive control strategy:

[0127] The final reactive power distribution time sequence Q of the new energy multi-station obtained by the progressive control strategy according to step 3 is Ts The ownership and switching sequence of reactive power sources are based on Q Ts The reactive power quota Q of the new energy single station where the reactive power source is located i0 To progressively control the target value, the state value control sequence {D1, D2, ...D r …, D N}Use the state value control sequence to perform the switching operation of the corresponding reactive source until ∑ N D r =Q i0 .

[0128] For example, for Q Ts ={Spv1=36, Sw2=54, PV1=180, ...}, first, the SVG reactive power quota Q of the new energy single station where pv1 is located is i0 =36 is the progressive control target value, and the control sequence {D1, D2, ... D r …, D N}), the state value of the SVG is controlled according to the control sequence until ∑ N D r =36, it can be understood that the state value of SVG is its initial value + D r The initial value is the real-time value of SVG at the moment before adjustment; Q i0 =36 is the target, that is, the final state value of SVG should be: initial value + 36; then, follow similar steps to perform Q i0 =54 is the progressive control of the target value, and the new energy single station where PV1 is located (i.e. the photovoltaic station itself) is controlled by Q i0 =180 is the progressive control of the target value, and so on.

[0129] by Figure 2 Take 220kV transformer as an example, where "W" stands for wind power, "PV" stands for photovoltaic power, L1 and L2 are load access points, respectively. The high voltage side of the 220kV transformer is equipped with capacitor banks of 10000kVar×12 and 10000kVar×7, i.e., a total of 19 capacitor banks. The reserve capacity of SVG when participating in voltage regulation is set to 10%. In addition, the 220kV substation is equipped with two groups of reactors with capacities of 70Mvar and 80Mvar respectively. The other input parameters required for calculation are shown in Table 1:

[0130] Table 1 Input parameters of new energy station model

[0131] Category\Station PV1 W1 W2 PV2 W3 PV3 Station capacity / MVA 200 212.5 204.3 50 320.5 150 SVG Capacity / MVA 40 64 60 10 96 30 U Sensitivity 4.167 3.2 4.167 1.733 3.667 4.0

[0132] In order to simulate the real-time operation conditions and facilitate calculation, the following initial conditions are set: line parameters are ignored, and the weights and adjustment times are taken as initial values ​​0; ω t Set to 0.9, and the weights of other parameters are 0.5; the seasonal factor and the day and night factor are 1; assume that all reactive source devices can operate normally in the current state without blocking behavior and the reactive output is 0; the operating condition is set to L1 load sudden increase.

[0133] Then, by using equations (3) and (4), we can get:

[0134] Ts={Spv1=0.9224, Sw2=0.9224, PV1=0.9224, W2=0.9224, Spv3=0.9218, PV3=0.9218, Sw3=0.9207, W3=0.9207, Sw1=0.9193, W1=0.9193 , Spv2=0.9145, PV2=0.9145, C1=0.8925, C2=0.8925, C3=0.8925, C4=0.8925, C5=0.8925, C6=0.8925, C7=0.8925, C8=0.8925, C9=0.892 5, C10 = 0.8925, C11 = 0.8925, C12 = 0.8925, C13 = 0.8925, C14 = 0.8925, C15 = 0.8925, C16 = 0.8925, C17 = 0.8925, C18 = 0.8925, C19 = 0.8925}, among which Spv1 = 0.9224 is ranked first, and the switching sequence is also the first, Spv1 indicates the ownership of the reactive source, indicating the SVG of the new energy single-field station where pv1 is located, and 0.9224 is the quantized value of the allocation timing; specifically, Spv1 = 0.9224 indicates the Ts of the SVG of the new energy single-field station where pv1 is located i = 0.9224, Sw2 = 0.9224 means the Ts of SVG of the new energy single station where w2 is located i =0.9224, PV1 = 0.9224 means the Ts of the new energy single station (i.e. the photovoltaic station itself) where PV1 is located i =0.9224, and so on.

[0135] The reactive power that can be switched on and off at present of each reactive source can be calculated by equation (1) and equation (2), i.e., the reactive power increment Q i0 , and then substitute into formula (5) to obtain the final reactive power distribution sequence of multiple renewable energy stations, that is, using Q i0 The value replaces the corresponding Ts in the above Ts i value:

[0136] Q Ts ={Spv1=36, Sw2=54, PV1=180, W2=183.87, Spv3=27, PV3=135, Sw3=86.4, W3=288.45, Sw1=57.6, W1=191.25, Spv2=9, PV2=45, C 1=9, C2=9, C3=9, C4=9, C5=9, C6=9, C7=9, C8=9, C9=9, C10=9, C11=9, C12=9, C13=9, C14=9, C15=9, C16=9, C17=9, C18=9, C19=9}

[0137] Due to a sudden increase in load, and Q Ts SVG and new energy are the first to participate, so the sigmoid progressive method is adopted; according to the above Q Ts The corresponding reactive source switching operation is performed in sequence until ∑ N D r =Q i0 until.

[0138] Embodiment 2 of the present invention provides a time-sequentially progressive reactive source coordinated switching system, the system comprising:

[0139] A calculation module is used to calculate the final reactive power quota of a single renewable energy station where the reactive power source is located based on the quarterly factor and the diurnal factor;

[0140] A sorting module is used to calculate the distribution timing quantization value of each reactive power source and sort them to obtain the reactive power distribution timing of multiple renewable energy stations, including reactive power source ownership, distribution timing quantization value and switching timing; the distribution timing quantization value in the reactive power distribution timing of multiple renewable energy stations is replaced with the corresponding reactive power quota to obtain the final reactive power distribution timing of multiple renewable energy stations;

[0141] The switching module is used to select the progressive control strategy according to the specific working conditions, and to perform the switching operations of the corresponding reactive sources in sequence according to the final reactive power distribution sequence of the new energy multi-station.

[0142] A terminal includes a processor and a storage medium; the storage medium is used to store instructions;

[0143] The processor is configured to operate according to the instructions to execute the steps according to the method.

[0144] A computer-readable storage medium stores a computer program, which implements the steps of the method when executed by a processor.

[0145] Compared with the prior art, the beneficial effects of the present invention are at least:

[0146] The present invention considers more comprehensive external factors in three aspects: reactive switching increment, reactive increment execution mode and reactive source execution sequence:

[0147] 1) In terms of reactive power switching increment, seasonal and day-night characteristic factors of different renewable energy sources are added to fully consider the reactive power output characteristics of renewable energy stations in the corresponding time period, avoid hidden dangers caused by the uncertainty of reactive power adjustable quantity, so as to provide early warning and reduce dispatching pressure;

[0148] 2) In terms of reactive power increment execution mode, unlike the traditional one-step or equal-step adjustment mode, the present invention fully considers the curve characteristics of different working conditions and adopts three progressive methods for adjustment, so that the voltage curve transition is smoother and the voltage quality level is significantly improved;

[0149] 3) In terms of reactive source execution timing, unlike the traditional method of only considering a few devices and technical factors, the present invention fully coordinates all adjustable devices, considers a variety of external and technical factors (such as the adjustable amount of reactive equipment, voltage sensitivity, branch sensitivity, response speed, locking state, adjustment number limit, weight), and determines the execution timing value of each reactive source by evaluating the benefits that can be brought by all adjustable devices under the current working conditions (so that the voltage reaches the voltage regulation target to the greatest extent), thereby avoiding the waste of reactive resources and fully coordinating and optimizing the management and configuration of each reactive source.

[0150] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0151] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0152] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0153] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for coordinated switching of reactive sources with progressive timing, characterized in that: The method comprises: Step 1: Calculate the final reactive power quota of the single renewable energy station where the reactive power source is located based on the quarterly factor and the diurnal factor; Step 2: Calculate the distribution timing quantization value of each reactive power source and sort them to obtain the reactive power distribution timing of multiple renewable energy stations, including reactive power source ownership, distribution timing quantization value and switching timing; The calculation formula of the distribution timing quantization value of each reactive power source is: In the formula, Ts i is the distribution time series quantization value of reactive power source i; N is the total number of reactive power sources in the new energy station; ω s ,ω sn ,ω t ,ω w They are voltage sensitivity weight, branch sensitivity weight, response speed weight, and weight value weight; S i is the voltage sensitivity of reactive source i; SN i is the branch sensitivity of reactive source i; T i is the response speed of reactive source i; W i is the weight of reactive source i; CL i is the number of adjustments of reactive source i; Step 3: Replace the allocation time sequence quantization value in the new energy multi-station reactive power allocation time sequence described in step 2 with the corresponding reactive power quota obtained in step 1 to obtain the final new energy multi-station reactive power allocation time sequence; Step 4: Select a progressive control strategy according to the specific working conditions, and perform the switching operations of the corresponding reactive sources in sequence according to the final reactive power distribution sequence of the new energy multi-station obtained in step 3.

2. A method for coordinated switching of reactive sources with progressive timing according to claim 1, characterized in that: In step 1, the calculation formula for the reactive power quota of the single renewable energy station where the reactive power source is located is: Q i0 =λ s ·r d ·Q i (1) In the formula, Q i0 is the final reactive power rating of the renewable energy single station where reactive power source i is located, λ s is the quarterly factor, ρ d is the diurnal factor, λ s , ρ d ∈[0,1], Q i is the reactive power allocation increment of reactive power source i.

3. The method for coordinated switching of reactive sources with progressive timing according to claim 2, characterized in that: Reactive power distribution increment Q of reactive power source i i for: Q i =lk i (Q res_i ±δ i ) (2) In the formula, lk i is the blocking state of reactive source i, Q res_i is the reactive power demand increment of reactive power source i, δ i is the margin threshold of reactive power source i.

4. The method for coordinated switching of reactive sources with progressive timing according to claim 1, characterized in that: Voltage sensitivity S of reactive source i i for: Where ΔQ i is the reactive power regulation of reactive power source i, ΔV ij is the magnitude of the voltage impact of reactive source i on compensation node j after adjustment alone; Branch sensitivity SN of reactive source i i for: SN i =Q i / L ij (7) L ij =N ij ·L ij In the formula, Q i is the reactive power distribution increment of reactive power source i, L ij is the generalized distance between reactive source i and compensation node j, l ij is the physical distance between reactive source i and compensation node j, N ij is the number of voltage levels spanned between compensation node j and reactive source i; The response speed T of reactive source i i for: T i =t i1 +t i2 +t i3 (8) In the formula, t i1 is the transmission time of the instruction, expressed as c·l ij Description, c is the speed of light; t i2 and t i3 They are the station internal command processing time and reactive equipment action preparation time; The weight W of reactive source i i for: Where n i_s is the number of successful times that reactive power source i participated in regulation in the past, N i_t is the total number of times reactive source i participated in regulation in the past.

5. The method for coordinated switching of reactive sources with progressive timing according to claim 1, characterized in that: The number of times the reactive source i is adjusted CL i for: CL i =lk i ·(OF cl_i of cl_i ) (10) In the formula, lk i Whether the reactive power source i needs to consider the number of times limit, which is 0 or 1, indicating that it does not need to be considered or the number of times limit needs to be considered respectively; n cl_i is the number of times reactive power source i has been used on that day, N cl_i The upper limit of the number of adjustments of reactive power source i on the day.

6. A method for coordinated switching of reactive sources with progressive timing according to claim 1, characterized in that: In step 4, a progressive control strategy is selected according to specific working conditions, including: For switching or replacement between continuous reactive sources, a sigmoid progressive control strategy is adopted; For the replacement from discrete reactive source to continuous reactive source, a hierarchical progressive control strategy is adopted; For reactive power switching under voltage mutation conditions, a binary progressive control strategy or a hierarchical progressive control strategy is adopted; For seasonal and day-night switching, a sigmoid progressive control strategy is adopted.

7. A method for coordinated switching of reactive sources with progressive timing according to claim 6, characterized in that: The binary progressive control strategy is: Where D r is the state value of the rth progressive control, r∈(1,N), N is the number of progressive times, D r+1 It is the state value of the r+1th progressive control.

8. A method for coordinated switching of reactive sources with progressive timing according to claim 6, characterized in that: Sigmoid progressive control strategy is: Where D ini is the current state value; D boj is the target value, and its value is the reactive power distribution sequence Q of multiple renewable energy stations Ts The reactive power value Q i0 ;D r is the state value of the rth progressive control.

9. A method for coordinated switching of reactive sources with progressive timing according to claim 6, characterized in that: The hierarchical progressive control strategy is: In the formula, N is the number of steps, D ini is the current state value, D boj is the target value, and its value is the reactive power distribution sequence Q of multiple renewable energy stations Ts The reactive power value Q i0 ;D r is the state value of the rth progressive control.

10. A method for coordinated switching of reactive sources with progressive timing according to claim 1, characterized in that: In step 4, the progressive control strategy is based on the final renewable energy multi-station reactive power distribution time sequence Q obtained in step 3. Ts The ownership and switching sequence of reactive power sources are based on Q Ts The reactive power quota Q of the new energy single station where the reactive power source is located i0 To progressively control the target value, the state value control sequence {D1, D2, ...D r …, D N }, the corresponding reactive source switching operation is performed with the state value control sequence until ∑ N D r =Q i0 .

11. A time-sequentially progressive reactive source coordinated switching system, used to execute the method according to any one of claims 1 to 10, characterized in that: The system comprises: A calculation module is used to calculate the final reactive power quota of a single renewable energy station where the reactive power source is located based on the quarterly factor and the diurnal factor; A sorting module is used to calculate the distribution timing quantization value of each reactive power source and sort them to obtain the reactive power distribution timing of multiple renewable energy stations, including reactive power source ownership, distribution timing quantization value and switching timing; the distribution timing quantization value in the reactive power distribution timing of multiple renewable energy stations is replaced with the corresponding reactive power quota to obtain the final reactive power distribution timing of multiple renewable energy stations; The switching module is used to select the progressive control strategy according to the specific working conditions, and to perform the switching operations of the corresponding reactive sources in sequence according to the final reactive power distribution sequence of the new energy multi-station.

12. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-10.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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