A safety verification method and device considering load participation in power market

Abstract

The present invention provides a safety verification calculation method and device considering the participation of loads in the power market, the method comprising: obtaining market clearing result data and the power distribution coefficient of the market winning power of the load-side market subject on each bus load, calculating the market winning power part of each bus load; obtaining the bus load prediction result data corresponding to each bus, calculating the active power data of each bus load, and the ratio of the market-oriented part to the non-market-oriented part; in the bus load stretching link, according to the ratio of the market-oriented part to the non-market-oriented part, determining the unbalanced amount of active power of the whole network shared by each bus load, correcting the active power of the bus load, and then performing power grid flow calculation. The present invention can accurately obtain the market winning power of a single load connected to an equivalent load, and then obtain the accurate power injected into the main grid by the equivalent load, ensuring that the winning power of each participating market load will not be corrected in the whole process of safety verification calculation, and improving the accuracy of flow calculation.

Description

Technical Field

[0001] The invention relates to the technical field of power system dispatching automation, and in particular to a safety verification method and device considering load participation in a power market. Background Art

[0002] In the power system, the power of a single load is small and dispersed in the system. The load operation state is highly random and cannot be directly called by the power grid. Therefore, the single load is generally not modeled. In the provincial dispatching and control system, the 220kV step-down transformer is usually regarded as the equivalent load to form a high-voltage transmission network model (main network model) of 220kV and above voltage levels. The provincial dispatching and control system directly predicts the power of the equivalent load. The equivalent load is called the bus load, and its power prediction is called the bus load prediction. At present, the power market technical support system usually organizes market clearing based on the power grid model data, bus load prediction and other data given by the provincial dispatching and control system, combined with the unit quotation information, and verifies the safety of the power grid through safety verification calculation. At the same time, when performing safety verification calculations, the bus load prediction results are usually corrected to a certain extent to apportion the active unbalanced amount, so as to reduce the problems of non-convergence of power flow calculation and poor calculation accuracy caused by low prediction accuracy and inaccurate network loss estimation.

[0003] However, as the power market is gradually liberalized, load aggregators, electric vehicle companies and other load-side entities can participate in the market to declare power price information and obtain the right to use electricity through competition. At present, load aggregators and other entities may aggregate multiple loads with different powers, different voltage levels, and different equivalent loads in actual physical locations into a controllable large aggregate load to participate in the power market bidding. In the safety verification process after the market is cleared, the market load entities attached to the equivalent load will affect the correctness of the power flow calculation. Summary of the invention

[0004] The purpose of the present invention is to provide a safety verification calculation method and device considering the load participating in the power market, which can accurately obtain the market winning power of the single load connected to the equivalent load, and then obtain the accurate power injected into the main grid by the equivalent load, so as to ensure that the winning power of each participating market load will not be corrected in the whole process of safety verification calculation, and improve the accuracy of power flow calculation. The technical solution adopted by the present invention is as follows.

[0005] In one aspect, the present invention provides a safety verification method considering load participation in an electricity market, comprising:

[0006] Obtain market clearing result data and the power allocation coefficient of the market winning power of the load-side market players on each bus load;

[0007] Calculate the market winning power portion of each bus load based on the market clearing result data and the power allocation coefficient;

[0008] Obtain the bus load forecast result data corresponding to each bus, and calculate the active power data of each bus load and the ratio of the marketized part to the non-marketized part in the active power data of each bus load according to the market-winning power part of the bus load and the bus load forecast result data;

[0009] In the bus load stretching link, according to the ratio of the marketized part to the non-marketized part in the bus load active power data, the unbalanced amount of active power of the whole network shared by each bus load is determined, and the active power of the bus load is corrected;

[0010] The power grid flow calculation is performed based on the corrected bus load active power, and the safety verification result is determined according to the result of the flow calculation. Optionally, the market clearing result data includes the winning power and electricity price information of each generator set, and the winning power and electricity price information of each market-based load.

[0011] Optionally, the calculation of the market winning power portion of each bus load includes:

[0012] Calculate the winning bid power of the loads connected to each bus load by each load-side market entity according to the market clearing result data and the power allocation coefficient;

[0013] Based on the winning bid power of the loads connected to each bus load by each load-side market entity, the winning bid power of the loads connected to all load-side market entities on each bus load is calculated as the market winning bid power part of the bus load.

[0014] In the present invention, the power allocation coefficient of the market winning power of the load-side market entity on each bus load is defined by the load-side market entity, and the basis of the definition includes the physical location of the load-side market entity and the load characteristics it possesses;

[0015] The power allocation coefficient of the market-winning electricity of the load-side market entity on each equivalent load satisfies the following formula:

[0016]

[0017] In the formula, β ij It represents the power allocation coefficient of the market winning bid electricity of the i-th load-side market entity on the j-th bus load, M is the number of load-side market entities in the whole network, and N is the total number of bus loads.

[0018] Optional, the market winning power portion of each bus load It is expressed as:

[0019]

[0020] In the formula, It represents the market winning bid power of the i-th load-side market entity connected to the j-th bus load, expressed as:

[0021]

[0022] P i market represents the market winning bid power of the i-th load-side market entity;

[0023] The calculation formula for the active data of each bus load is:

[0024]

[0025] In the formula, Indicates the bus load prediction result data;

[0026] The ratio of the marketized part to the non-marketized part of the bus load is expressed as:

[0027]

[0028] Optionally, the correcting the active power of the bus load includes:

[0029] Calculate the unbalanced amount of power generation and consumption in the whole network when the load participates in the market;

[0030] The bus load active power after sharing the active power unbalance is calculated as the corrected bus load active power.

[0031] Optional, the unbalanced amount of active power generation and consumption of the whole network when the load participates in the market △P s The calculation formula is:

[0032]

[0033] Where K is the total number of generators in the entire grid, L is the total number of tie lines, P Gk is the active power of generator k, α Gk is the power consumption rate of generator k, P l tieline is the active power of tie line l, P loss is the system network loss, μ is the fixed network loss rate estimated based on operating experience, P loss It is expressed as:

[0034]

[0035] Bus load active power after sharing active power unbalance The calculation formula is:

[0036]

[0037] In a second aspect, the present invention provides a safety verification device considering load participation in the power market, comprising:

[0038] A data acquisition module is configured to acquire market clearing result data, power allocation coefficients of the market winning power of the load-side market entities on each bus load, and bus load forecast result data corresponding to each bus;

[0039] A load-side market subject connected power calculation module is configured to calculate the load winning bid power connected to each bus load by each load-side market subject according to the market clearing result data and the power allocation coefficient;

[0040] The bus load marketization part calculation module is configured to calculate the market bid power part of each bus load according to the load bid power of each load-side market entity connected to each bus load;

[0041] The bus load active power calculation module is configured to calculate the active power data of each bus load and the ratio of the marketized part to the non-marketized part in the active power data of each bus load according to the market-winning power part of the bus load and the bus load prediction result data;

[0042] The bus load active power correction module is configured to determine the unbalanced amount of active power of the entire network shared by each bus load according to the ratio of the marketized part to the non-marketized part in the bus load active power data in the bus load stretching link, and correct the bus load active power;

[0043] And, a safety verification result determination module is configured to perform power grid flow calculation based on the corrected bus load active power, and determine the safety verification result according to the result of the flow calculation.

[0044] Optionally, the bus load marketization part calculation module calculates the market bid winning power part of each bus load including:

[0045] Calculate the winning bid power of the loads connected to each bus load by each load-side market entity according to the market clearing result data and the power allocation coefficient;

[0046] Based on the winning bid power of the loads connected to each bus load by each load-side market entity, the winning bid power of the loads connected to all load-side market entities on each bus load is calculated as the market winning bid power part of the bus load.

[0047] Optionally, the bus load active power correction module corrects the bus load active power including:

[0048] Calculate the unbalanced amount of power generation and consumption in the whole network when the load participates in the market;

[0049] The bus load active power after sharing the active power unbalance is calculated as the corrected bus load active power.

[0050] In a third aspect, the present invention provides a storage medium comprising computer executable instructions, which, when executed by a computer, implement the security verification method considering load participation in the electricity market as described in the first aspect.

[0051] Beneficial Effects

[0052] Taking into account that the actual active value of the bus load after the market is cleared is actually the result of the superposition of the non-market bus load prediction result given by the dispatching and control system and the market load, the present invention first calculates the market load part connected to each bus load according to the power allocation coefficient of each load-side market entity, and compares the market load part with the non-market load part. Then, in the safety verification bus load stretching link, according to the ratio of the market load to the non-market load in the bus load active value, the active unbalance value of the whole network shared by each bus load is calculated, the bus load active power is corrected, and the active value of the bus load that finally participates in the safety verification calculation is obtained to calculate the flow.

[0053] The present invention can accurately consider the impact of load-side entities participating in the market on the power grid trend in the safety verification calculation, and at the same time ensure that the power bid by the load-side entities is not corrected by the algorithm in the safety verification algorithm, which is of great significance for improving the accuracy of power market safety verification, the recognition of market entities, and the safety level of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 Shown is a schematic flow chart of an embodiment of the method of the present invention;

[0055] Figure 2 Shown is a schematic diagram of a power grid architecture applicable to the method of the present invention. DETAILED DESCRIPTION

[0056] The invention is further described below with reference to the accompanying drawings and specific embodiments.

[0057] The technical concept of the present invention is: considering the situation where the load participates in the electricity market and the winning power of the market-oriented load is decomposed into different equivalent loads, the active value of the equivalent load and the ratio of the market-oriented part to the non-market-oriented part of the equivalent load are calculated according to the power allocation coefficient of the market entity on the load side on each equivalent load, and then in the bus load stretching link in the safety verification calculation, the bus load active power is corrected according to the proportional coefficient, thereby improving the reliability of the results of the flow calculation and the safety verification, and at the same time ensuring that the winning power of the market-oriented load is not corrected.

[0058] The market-oriented load mentioned in the present invention refers to the load that participates in the market and declares the electricity price information.

[0059] The bus load stretching described in the present invention refers to the process of correcting the bus load prediction result to apportion the unbalanced amount of active power between power generation and power consumption of the entire network during the safety verification calculation process.

[0060] The non-marketized part of the bus load described in the present invention refers to the active value uniformly predicted by the dispatching agency or market operation agency without participating in the market declaration of power price information. The present invention assumes that the prediction results of the non-marketized part of the bus load given by the dispatching control system or market operation agency are relatively accurate. The market-oriented subject on the load side can define the distribution coefficient of its market-winning power in each equivalent load after optimization and clearing.

[0061] Example 1

[0062] like Figure 1 As shown, this embodiment introduces a safety verification method considering load participation in the power market, including:

[0063] Obtain market clearing result data and the power allocation coefficient of the market winning power of the load-side market players on each bus load;

[0064] Calculate the market winning power portion of each bus load based on the market clearing result data and the power allocation coefficient;

[0065] Obtain the bus load forecast result data corresponding to each bus, and calculate the active power data of each bus load and the ratio of the marketized part to the non-marketized part in the active power data of each bus load according to the market-winning power part of the bus load and the bus load forecast result data;

[0066] In the bus load stretching link, according to the ratio of the marketized part to the non-marketized part in the bus load active power data, the unbalanced amount of active power of the whole network shared by each bus load is determined, and the active power of the bus load is corrected;

[0067] The power grid flow calculation is performed based on the corrected bus load active power, and the safety verification result is determined according to the result of the flow calculation.

[0068] The method of this embodiment specifically includes the following steps.

[0069] S1, obtains the market clearing result data, as well as the power allocation coefficient of the market winning power on each bus load defined by the load-side market entity LA after the market clearing, based on the characteristics of its own loads, actual physical location, etc. The power allocation coefficient can characterize the connection relationship between the market-based load and the main grid model.

[0070] The market clearing result data includes the winning power and electricity price information of each generating unit, as well as the winning power and electricity price information of each market load. Only the grid dispatching agency or market operation agency can obtain the winning power and electricity price information of all units and loads; for a specific entity such as a power plant or load aggregator, it can only obtain the winning power and electricity price information of its own units and loads in the market.

[0071] The market-based load connection relationship table formed by the power allocation coefficient of the market-winning power of the load-side market entity LA on each bus load is shown in Table 1.

[0072] Table 1 Market load connection relationship table

[0073]

[0074] The power allocation coefficient of the load-side market players in Table 1 must satisfy the following formula:

[0075]

[0076] In the formula, β ij It represents the power allocation coefficient of the market winning bid electricity of the i-th load-side market entity on the j-th bus load, M is the number of load-side market entities in the whole network, and N is the total number of bus loads.

[0077] S2, calculating the market winning power portion of each bus load according to the market clearing result data and the power allocation coefficient, including the following steps.

[0078] S21, based on the market clearing result data and the power allocation coefficient, calculate the load winning power of each load-side market entity connected to each bus load;

[0079] Taking LAi as an example, the calculation formula of the load market winning power connected to the bus load Tj is as follows:

[0080]

[0081] In the formula, It represents the bid power value of the load connected to the bus load Tj by LAi, P i market Indicates the winning bid power value of LAi in the market.

[0082] S22, according to the load winning power connected to each bus load by each load-side market entity, calculate the load winning power connected to all load-side market entities on each bus load as the market winning power part of the bus load.

[0083] The market winning power part of each bus load It is expressed as:

[0084]

[0085] S3, obtaining the bus load forecast result data corresponding to each bus, and calculating the active power data of each bus load and the ratio of the market-based part to the non-market-based part in the active power data of each bus load according to the market-based winning power portion of the bus load and the bus load forecast result data.

[0086] The bus load forecast result data can be obtained from the dispatching control system. In this embodiment, it is the bus load forecast result of non-market load. Taking Tj as an example, the active power of the bus load is The calculation formula is as follows:

[0087]

[0088] The ratio of the market-based bid power to the predicted active power of the non-market-based load in the bus load λ j , as shown in formula (4):

[0089]

[0090] S4, in the bus load stretching link of the safety verification process, according to the ratio of the marketized part to the non-marketized part in the bus load active power data, the unbalanced amount of active power of the whole network shared by each bus load is determined, and the bus load active power is corrected. Specifically, the following steps are included.

[0091] S41, calculate the unbalanced amount of active power generation and consumption in the whole grid under the load participation market. For a grid that exchanges power with neighboring grids, its power generation part includes the total power generation plan of the units and the power of the interconnection lines outside the area. Let the total number of generators in the whole grid be K and the total number of interconnection lines be L, then the formula for calculating the unbalanced amount of active power is as follows (5):

[0092]

[0093] In the formula, △P s is the unbalanced active power of the whole network, P Gk is the active power of generator k, α Gk is the power consumption rate of generator k, P l tieline represents the active power of tie line l, P loss It is the system network loss.

[0094] In formula (5), all other known quantities except system network loss can be directly substituted into the formula. System network loss is the active power consumed in resistance and conductance during the transmission of electric energy. The fixed network loss rate can be estimated based on the existing technology and operating experience, and the system network loss can be calculated using formula (6).

[0095]

[0096] Where μ is the fixed network loss rate estimated based on operating experience.

[0097] S42, calculate the active value of the bus load after the active unbalance is shared. Taking Tj as an example, the calculation formula is as follows (7):

[0098]

[0099] In the formula, It indicates the active value of Tj after the unbalanced active power is shared.

[0100] S5, based on the corrected bus load active power, the power grid flow calculation is performed, and the safety verification result is determined according to the result of the flow calculation. The algorithm for the power grid flow calculation can adopt the existing technology, and the safety verification is performed based on the result of the flow calculation, that is, the impact of the load side subject participating in the market on the power grid flow is taken into account, which can ensure that the load side subject's winning power is not corrected by the algorithm, and can improve the accuracy of the safety verification.

[0101] In this embodiment, during the safety verification calculation, the winning power of the single load connected to the equivalent load in the market is obtained. On the one hand, the accurate power injected into the main grid by each equivalent load can be obtained. On the other hand, it can ensure that the winning power of each participating market load will not be corrected during the entire process of safety verification calculation, so as to avoid raising doubts from market players.

[0102] Example 2

[0103] This embodiment introduces a safety verification device considering load participation in the power market, including:

[0104] A data acquisition module is configured to acquire market clearing result data, power allocation coefficients of the market winning power of the load-side market entities on each bus load, and bus load forecast result data corresponding to each bus;

[0105] A load-side market subject connected power calculation module is configured to calculate the load winning bid power connected to each bus load by each load-side market subject according to the market clearing result data and the power allocation coefficient;

[0106] The bus load marketization part calculation module is configured to calculate the market bid power part of each bus load according to the load bid power of each load-side market entity connected to each bus load;

[0107] The bus load active power calculation module is configured to calculate the active power data of each bus load and the ratio of the marketized part to the non-marketized part in the active power data of each bus load according to the market-winning power part of the bus load and the bus load prediction result data;

[0108] The bus load active power correction module is configured to determine the unbalanced amount of active power of the entire network shared by each bus load according to the ratio of the marketized part to the non-marketized part in the bus load active power data in the bus load stretching link, and correct the bus load active power;

[0109] And, a safety verification result determination module is configured to perform power grid flow calculation based on the corrected bus load active power, and determine the safety verification result according to the result of the flow calculation.

[0110] In this embodiment, the specific functions of the above functional modules are implemented with reference to the relevant contents of the method in Embodiment 1, such as: the bus load marketization part calculation module calculates the market winning power part of each bus load, including:

[0111] Calculate the winning bid power of the loads connected to each bus load by each load-side market entity according to the market clearing result data and the power allocation coefficient;

[0112] Based on the winning bid power of the loads connected to each bus load by each load-side market entity, the winning bid power of the loads connected to all load-side market entities on each bus load is calculated as the market winning bid power part of the bus load.

[0113] The bus load active power correction module corrects the bus load active power including:

[0114] Calculate the unbalanced amount of power generation and consumption in the whole network when the load participates in the market;

[0115] The bus load active power after sharing the active power unbalance is calculated as the corrected bus load active power.

[0116] Example 3

[0117] This embodiment introduces a storage medium containing computer executable instructions, which, when processed and executed by a computer, implements the security verification method considering load participation in the electricity market as described in Example 1.

[0118] In summary, the present invention can accurately consider the impact of the load-side entity's participation in the market on the power grid trend in the safety verification, and at the same time ensure that the load-side entity's winning bid power is not corrected by the algorithm in the safety verification algorithm, which is of great significance for improving the accuracy of power market safety verification, market entity recognition, and power grid safety level.

[0119] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0120] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0121] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0123] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A safety verification method considering load participation in the power market, characterized in that: include: Obtain market clearing result data and the power allocation coefficient of the market winning power of the load-side market players on each bus load; Calculate the market winning power portion of each bus load based on the market clearing result data and the power allocation coefficient; Obtain the bus load forecast result data corresponding to each bus, and calculate the active power data of each bus load and the ratio of the marketized part to the non-marketized part in the active power data of each bus load according to the market-winning power part of the bus load and the bus load forecast result data; In the bus load stretching link, according to the ratio of the marketized part to the non-marketized part in the bus load active power data, the unbalanced amount of active power of the whole network shared by each bus load is determined, and the active power of the bus load is corrected; Calculate the power flow of the power grid based on the corrected bus load active power, and determine the safety verification result according to the result of the power flow calculation; The calculation of the market winning power part of each bus load includes: Calculate the winning bid power of the loads connected to each bus load by each load-side market entity according to the market clearing result data and the power allocation coefficient; According to the load winning power connected to each bus load by each load-side market entity, calculate the load winning power connected to all load-side market entities on each bus load as the market winning power part of the bus load; The correction of the bus load active power comprises: Calculate the unbalanced amount of power generation and consumption in the whole network when loads participate in the market; The bus load active power after sharing the active power unbalance is calculated as the corrected bus load active power.

2. The method according to claim 1, characterized in that: The power allocation coefficient of the market winning power of the load-side market entity on each bus load is defined by the load-side market entity, and the basis for the definition includes the physical location of the load-side market entity and the load characteristics it possesses; The power allocation coefficient of the market-winning electricity of the load-side market entity on each equivalent load satisfies the following formula: ， In the formula, Indicates The market winning bid of the load-side market players is The power distribution coefficient on the bus load is is the number of market players on the load side of the entire network, is the total bus load.

3. The method according to claim 2, characterized in that: The market winning power part of each bus load It is expressed as: ， In the formula, Indicates The load-side market entity is connected to the The market bid power on the bus load is expressed as: ， Indicates The market bidding power of the load-side market players; The calculation formula for the active data of each bus load is: ， In the formula, Indicates the bus load prediction result data; The ratio of the marketized part to the non-marketized part of the bus load is expressed as: 。 4. The method according to claim 3, characterized in that the load Active power imbalance between power generation and consumption in the whole grid under market participation The calculation formula is: ， In the formula, K is the total number of generators in the whole network, L is the total number of tie lines, is the active power of generator k, is the power consumption rate of generator k, For contact line Of merit, is the system network loss, As a fixed network loss rate estimated based on operating experience, It is expressed as: ， Bus load active power after sharing active power unbalance The calculation formula is: 。 5. A safety verification device for loads participating in the power market using any of the methods of claims 1-4, characterized in that: include: A data acquisition module is configured to acquire market clearing result data, power allocation coefficients of the market winning power of the load-side market entities on each bus load, and bus load forecast result data corresponding to each bus; A load-side market subject connected power calculation module is configured to calculate the load winning bid power connected to each bus load by each load-side market subject according to the market clearing result data and the power allocation coefficient; The bus load marketization part calculation module is configured to calculate the market bid power part of each bus load according to the load bid power of each load-side market entity connected to each bus load; The bus load active power calculation module is configured to calculate the active power data of each bus load and the ratio of the marketized part to the non-marketized part in the active power data of each bus load according to the market-winning power part of the bus load and the bus load prediction result data; The bus load active power correction module is configured to determine the unbalanced amount of active power of the entire network shared by each bus load according to the ratio of the marketized part to the non-marketized part in the bus load active power data in the bus load stretching link, and correct the bus load active power; And, a safety verification result determination module is configured to perform power grid flow calculation based on the corrected bus load active power, and determine the safety verification result according to the result of the flow calculation.

6. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions, when executed by a computer, implement the safety verification method considering load participation in the electricity market as described in any one of claims 1 to 4.

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