Intelligent meter box terminal and load balancing method

Abstract

The invention discloses an intelligent meter box terminal and a load balancing method, and the method comprises the steps: deploying the intelligent meter box terminal in a preset region, and enabling the intelligent meter box terminal to automatically configure power utilization wiring configuration conditions for all users; the intelligent meter box terminal predicts the electrical load of the user in a future period of time based on the historical electrical load data of the user; judging the load balance degree of the three-phase load in a period of time in the future according to a load balance judgment method according to a future electrical load prediction result of each user, calculating whether the unbalance degree of the three-phase electrical load is within a preset threshold value or not, and if yes, controlling a power supply line of an intelligent meter box terminal to supply power according to an electrical wiring configuration condition; if not, the intelligent meter box terminal outputs the updated power utilization wiring configuration condition, phases are configured for all the users according to the updated power utilization wiring configuration condition, the intelligent meter box terminal conducts metering and meter reading for all the users, the power utilization use condition of each user is counted, and continuous monitoring of power utilization load balance of the intelligent meter box terminal is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply and distribution, and particularly to an intelligent meter box terminal and a load balancing method. Background Art

[0002] For low-voltage residential users, currently, a metering electric meter is mainly installed in the meter box, one meter for each household, with fixed wiring. In the way of one meter for each household, the cost of multiple meters is relatively high. From the perspective of installation and deployment, each meter needs to be wired separately, and the construction is complex. There are problems of unbalanced three-phase voltage and current in the low-voltage power supply area, and the wiring of the user's independent electric meter cannot be automatically adjusted. Summary of the Invention

[0003] Technical Objective: Aiming at the defects in the prior art, the present invention discloses an intelligent meter box terminal and a load balancing method, which support unified deployment and management of the meter box, users can access according to their needs, unified meter reading, and dynamically adjust the balance of the electrical load.

[0004] Technical Solution: To achieve the above technical objective, the present invention adopts the following technical solutions.

[0005] A load balancing method for an intelligent meter box terminal includes the following steps:

[0006] S1. Deploy an intelligent meter box terminal within a preset area. The intelligent meter box terminal provides a power supply line for all users within the preset area, and the intelligent meter box terminal supplies power to users through output wiring.

[0007] S2. The intelligent meter box terminal automatically configures the power connection configuration for all users.

[0008] S3. The intelligent meter box terminal manages the historical data of the electrical load of each user, and predicts the electrical load of the user in the next period of time based on the historical data; through the prediction results of the electrical load of each user in the future, judge the load balance degree of the three-phase load in the next period of time according to the load balancing decision method, and calculate whether the unbalanced degree of the three-phase electrical load is within the preset threshold. If so, control the power supply line of the intelligent meter box terminal to supply power according to the power connection configuration, and enter step S4; if not, the intelligent meter box terminal outputs the updated power connection configuration, configures the phase for all users according to the updated power connection configuration, and enters step S4.

[0009] S4. The intelligent meter box terminal meters and reads the meters for all users, and counts the electricity usage of each user to realize continuous monitoring of the electrical load balance of the intelligent meter box terminal.

[0010] The present invention also discloses an intelligent meter box terminal for implementing the load balancing method of the above-mentioned intelligent meter box terminal. The intelligent meter box terminal is used to provide power supply lines for all users in a preset area and supply power to users through output wiring.

[0011] The intelligent meter box terminal automatically configures the power connection configuration for all users; manages the historical power load data of each user, and predicts the future power load of users based on the historical data; based on the predicted results of the future power load of each user, judges the load balance degree of the three-phase load in the future period according to the load balancing decision method, and calculates whether the three-phase load imbalance degree is within a preset threshold. If so, it supplies power according to the power connection configuration; if not, the intelligent meter box terminal outputs the updated power connection configuration, configures phases for all users according to the updated power connection configuration, and the intelligent meter box terminal meters and reads the meters for all users to count the power usage of each user.

[0012] Beneficial effects:

[0013] 1. According to the historical power load data, the present invention performs load prediction, makes three-phase imbalance judgment and balance in advance based on the future power load, realizes automatic adjustment of the load imbalance of the intelligent meter box terminal, and improves power supply quality and power usage safety.

[0014] 2. The present invention is adaptable to the change of user power load and can be adjusted between single-phase and three-phase, with flexible expansion.

[0015] 3. The present invention reads the user power consumption data uniformly, with high efficiency.

[0016] 4. The present invention uses a unified electric meter, with simple installation and maintenance of equipment, unified deployment and management, users can access on demand, unified meter reading, and low cost. Description of the drawings

[0017] Figure 1 is the method flow chart of the present invention;

[0018] Figure 2 is the framework schematic diagram of the present invention. Detailed implementation manners

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0020] As shown in the attached Figure 1and appendix Figure 2 As shown, a load balancing method for an intelligent meter box terminal in this embodiment includes the following steps:

[0021] S1. Deploy intelligent meter box terminals within a preset area. The intelligent meter box terminals provide power supply lines for all users within the preset area, and the intelligent meter box terminals supply power to users through output wiring. Among them, the preset area can be a residential building, a community, or an office building, etc. The preset area includes several users waiting for electricity. The intelligent meter box terminals provide corresponding power supply lines for users. For example, when a user needs single-phase electricity, the intelligent meter box terminal provides one output wiring. When a user needs three-phase electricity, the intelligent meter box terminal provides three output wirings;

[0022] S2. The intelligent meter box terminals automatically configure the power connection configuration for all users. Among them, three-phase electricity users are configured with three-phase power supply lines, and single-phase electricity users are sequentially configured with power supply lines of phase A, phase B, and phase C in order;

[0023] S3. The intelligent meter box terminals manage the historical power load data of each user and predict the future power load of users based on the historical data. Through the prediction results of the future power load of each user, judge the load balance degree of the three-phase load in the future for a period of time according to the load balancing decision-making method, and calculate whether the three-phase power load imbalance degree is within the preset threshold. If so, supply power according to the power connection configuration, and enter step S4; if not, the intelligent meter box terminal outputs the updated power connection configuration, and configure phases for all users according to the updated power connection configuration, and enter step S4;

[0024] The load balancing decision-making method includes the following steps:

[0025] S31. Construct a prediction window according to the historical power load data of each user. Among them, the length of the prediction window is p, and the specific value is determined according to actual experience. The data in the prediction window is the historical power load data from the current moment to the past p moments. Calculate the power prediction of each user at time t + 1 according to the prediction window. The intelligent meter box terminal stores the historical power load data of each user. In this embodiment, it is default to store the historical power load data of the recent one year. The historical data of the first 11 months is taken at the corresponding moment in units of days, and the historical data of the recent one month is taken at the corresponding moment in units of weeks. Predict the future power consumption of each user, and calculate the future power load of each user using the seasonal historical power load sequence prediction algorithm. The prediction step is 10, and the time length of each step is 30 minutes. Calculate the power prediction of each user at time t + 1 according to the prediction window. The calculation formula is:

[0026]

[0027] where: p(am_t+1) is the electricity consumption prediction for phase A of the m-th user at time t+1, t+1 is the predicted future time, t is the current time, and p(am_t-k) is the k-th recorded value of the historical electricity load of the m-th user; 1≤k≤p, where p is the length of the prediction window; p(bn_t+1) is the electricity consumption prediction for phase B of the n-th user at time t+1, and p(bn_t-k) is the k-th recorded value of the historical electricity load of the n-th user; p(cr_t+1) is the electricity consumption prediction for phase C of the r-th user at time t+1, and p(cr_t-k) is the k-th recorded value of the historical electricity load of the r-th user;

[0028] SARIMA: Seasonal Autoregressive Integrated Moving Average, which is a prediction function based on the seasonal historical electricity load sequence, i.e., the existing calculation formula;

[0029] S32. The intelligent meter box terminal automatically detects the three-phase electricity load situation at time t+1. The calculation formula for the three-phase electricity load situation at time t+1 is:

[0030]

[0031] where: P(a_t+1 total), P(b_t+1 total), and P(c_t+1 total) respectively represent the total load magnitudes of phases A, B, and C at time t+1; M represents the total number of M output channels in the intelligent meter box terminal connected to phase A; N represents the total number of N output channels in the intelligent meter box terminal connected to phase B; R represents the total number of R output channels in the intelligent meter box terminal connected to phase C;

[0032] S33. The intelligent meter box terminal calculates the load balance index based on the three-phase electricity load situation at time t+1. The calculation formula for the load balance index is:

[0033] Bi_t+1 = Fun(P(a_t+1 total), P(b_t+1 total), P(c_t+1 total))

[0034] where Bi_t+1 represents the load balance index at the prediction time, i.e., time t+1; Fun() is the load balance calculation function, and an existing function such as the variance function can be used for calculation;

[0035] Calculate the set of load balance degree indices for each electricity consumption in the next 10 steps using the same method: {Bi_t+1, Bi_t+2,..., Bi_t+10};

[0036] S34. The intelligent meter box terminal calculates the unbalance degree of the three-phase electrical load within the set future time range; its calculation formula is:

[0037] E(Bi) = (Bi_t + 1) + (Bi_t + 2) +... + (Bi_t + 10)

[0038] Where: E(Bi) is the unbalance degree of the three-phase electrical load within the future set time range;

[0039] S35. The intelligent meter box terminal determines whether the unbalance degree of the three-phase electrical load is within the preset threshold. If so, it is determined that the current three-phase electrical load is balanced. If not, the updated power connection configuration is obtained according to the load balancing adjustment method;

[0040] The load balancing adjustment method includes the following steps:

[0041] S351. Calculate the total single-phase adjustable phase load magnitudes of phases A, B, and C in the intelligent meter box terminal. The calculation formula is:

[0042]

[0043] Where, P(a total adjustable) represents the adjustable load magnitude of single-phase power supply users using phase A in the intelligent meter box terminal, and M1 represents a total of M1 adjustable power supply channels among the m power supply channels using phase A in the intelligent meter box terminal; P(b total adjustable) represents the adjustable load magnitude of single-phase power supply users using phase B in the intelligent meter box terminal, and N1 represents a total of N1 adjustable power supply channels among the n power supply channels using phase A in the intelligent meter box terminal; P(total adjustable) represents the adjustable load magnitude of single-phase power supply users using phase C in the intelligent meter box terminal, and R1 represents a total of R1 adjustable power supply channels among the r power supply channels using phase A in the intelligent meter box terminal;

[0044] S352. Calculate the load balancing coefficient according to the total single-phase adjustable phase load magnitudes of phases A, B, and C in the intelligent meter box terminal. The calculation formula of the load balancing coefficient is:

[0045]

[0046] S353. Calculate the adjustable user phase, and calculate the adjusted three-phase load unbalance sample variance in combination with the load balancing coefficient. The calculation formula is:

[0047]

[0048]

[0049] In the present invention, the variances can be calculated respectively by traversing, and the minimum S is calculated to obtain the adjusted user phases of each output channel of phases A, B, and C, that is, the updated power connection configuration;

[0050] In another embodiment of the present invention, when calculating S, the optimal solution can be obtained in the following manner:

[0051] S = Min(minimum variance of phases of the previous i - 1 users + variance corresponding to the ith user using A,

[0052] minimum variance of phases of the previous i - 1 users + variance corresponding to the ith user using B,

[0053] minimum variance of phases of the previous i - 1 users + variance corresponding to the ith user using C);

[0054] wherein, the value range of i is the set of users with adjustable phases, Min(): the function for taking the minimum value, which is used to calculate the minimum result when the users are respectively set to phases A, B, and C; through continuous recursive iteration, the final result is obtained;

[0055] S4. The intelligent meter box terminal meters and reads the meters for all users, and statistically analyzes the electricity usage of each user. For the DL / T - 645 protocol, if all meter data is read, it is read once through the wildcard address, and uniformly returned by the intelligent meter box terminal; all users' electricity data is collected in one data interaction, and the communication efficiency is high.

[0056] In this embodiment, the intelligent meter box terminal associates the corresponding power supply line according to the electricity connection situation of the user, and automatically meters the electricity consumption of the user in units of the user;

[0057]

[0058] Among them:

[0059] U: represents all user meters connected under this intelligent meter box terminal;

[0060] u1: represents a user identifier in units of the user managed by this intelligent meter box terminal;

[0061] {u1, {c1}}: indicates that the user corresponding to u1 is a single - phase user and uses the power supply line channel 1, {u2, {c1, c2, c3}} indicates that the u2 user is a three - phase electricity user and uses the power supply line channels 1, 2, and 3;

[0062] The method of the present invention further includes:

[0063] When there is an increase in users, the intelligent meter box terminal automatically configures the electricity connection configuration for the new users and then enters step S3;

[0064] When there is a change in the electricity usage attribute of a user, the intelligent meter box terminal automatically configures the electricity connection configuration for the user and then enters step S3;

[0065] The method of the present invention further includes:

[0066] The intelligent meter box terminal performs a balance judgment once within a preset time period, that is, judges whether the current three-phase electrical load is balanced according to the load balance adjudication method, so as to prevent the load imbalance situation in a certain time period.

[0067] In this embodiment, the current power connection configuration is as follows:

[0068]

[0069] Among them, C represents the record table of all output wiring phase relationships; c1 represents a power supply line channel output by the intelligent meter box terminal; A represents that the corresponding channel phase is phase A; {c1, A} represents that the first output wiring channel c1 corresponds to the power supply phase A; {c5, I} represents that the fifth output channel is currently idle, and the others are similar;

[0070] After a certain user changes from single-phase power to three-phase power, the updated power connection configuration according to the method described in the present invention is as follows:

[0071]

[0072]

[0073] Among them:

[0074] U’ represents the corresponding relationship between the user and the output channel after the u1 user is adjusted from a single-phase user to a three-phase user. Among them, the u1 user changes from being associated with the cl channel to being associated with the c1, c6, and c7 channels;

[0075] C” represents the corresponding phase table of the power supply line output by the intelligent meter box terminal after the user u1 is expanded from a single-phase user to a three-phase power user. Among them, the output channels c5 and c6 change from idle to phase B and phase C respectively;

[0076] As shown in the appendix Figure 2 As shown, this embodiment also discloses an intelligent meter box terminal for implementing the load balance method of the above-mentioned intelligent meter box terminal. The intelligent meter box terminal provides power supply lines for all users within a preset area and supplies power to users through output wiring;

[0077] The intelligent meter box terminal automatically configures the power connection configuration for all users; the intelligent meter box terminal determines whether the current three-phase power load is balanced according to the load balancing arbitration method. If so, it supplies power according to the power connection configuration. The intelligent meter box terminal meters and reads the meters for all users and statistics the power consumption of each user. If not, the intelligent meter box terminal outputs the updated power connection configuration, configures the phases for all users according to the updated power connection configuration, meters and reads the meters for all users, and statistics the power consumption of each user. The intelligent meter box terminal functions as configuration scheduling, metering, load balancing, and protection, etc.

[0078] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art of the present technology, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A load balancing method for a smart meter box terminal, characterized in that: The following steps are involved: S1. Deploy smart meter box terminals in a preset area. The smart meter box terminals provide power supply lines for all users in the preset area. The smart meter box terminals provide power to users through output wiring; S2, the smart meter box terminal automatically configures the power wiring configuration for all users; S3. The smart meter box terminal manages the historical data of each user's power load and predicts the user's power load for a period of time in the future based on the historical data; By predicting the future power load of each user, the load balance degree of the three-phase load in the future period of time is judged according to the load balance judgment method, and whether the imbalance degree of the three-phase power load is within the preset threshold value is calculated. If so, the power supply line of the smart meter box terminal is controlled to supply power according to the power wiring configuration, and the process goes to step S4; if not, the smart meter box terminal outputs the updated power wiring configuration, and configures the phase for all users according to the updated power wiring configuration, and the process goes to step S4; S4. The smart meter box terminal measures and reads meters for all users, counts the electricity usage of each user, and realizes continuous monitoring of the balance of electricity load on the smart meter box terminal.

2. The load balancing method of a smart meter box terminal according to claim 1, characterized in that: In S2, three-phase electricity users are configured with three-phase power supply lines, and single-phase electricity users are configured with A-phase, B-phase, and C-phase power supply lines in sequence.

3. The load balancing method of a smart meter box terminal according to claim 1, characterized in that: The load balancing decision method includes the following steps: S31, constructing a prediction window based on the historical power load data of each user, and calculating the power consumption prediction of each user at time t+1 based on the prediction window; S32, the intelligent meter box terminal automatically detects the three-phase power load at time t+1; S33, the intelligent meter box terminal calculates the load balance index according to the three-phase power load situation at time t+1; S34, the intelligent meter box terminal calculates the unbalanced degree of three-phase electric load within a future set time range; S35. The smart meter box terminal determines whether the three-phase power load imbalance is within a preset threshold. If so, it determines that the current three-phase power load is balanced. If not, it obtains an updated power wiring configuration according to the load balancing adjustment method.

4. The load balancing method for a smart meter box terminal according to claim 3, characterized in that: The power consumption forecast of each user at time t+1 is calculated based on the forecast window. The calculation formula is: Where: p(am_t+1) is the electricity consumption forecast for phase A of the mth user at time t+1, t+1 is the predicted future time, time t is the current time, p(am_t-k) is the kth record value of the mth user in the historical electricity load; 1≤k≤p, p is the length of the prediction window; p(bn_t+1) is the electricity consumption forecast for phase B of the nth user at time t+1, p(bn_t-k) is the kth record value of the nth user in the historical electricity load; p(cr_t+1) is the electricity consumption forecast for phase C of the rth user at time t+1, p(cr_t-k) is the kth record value of the rth user in the historical electricity load, and SARIMA is a prediction function based on seasonal historical electricity load series.

5. The load balancing method of a smart meter box terminal according to claim 4, characterized in that: The calculation formula for the three-phase power load at time t+1 is: Among them: P(a_t+1 total), P(b_t+1 total), P(c_t+1 total) respectively represent the total load size of phase A, phase B, and phase C at time t+1; M means that there are M outputs in the smart meter box terminal connected to phase A; N means that there are N outputs in the smart meter box terminal connected to phase B; R means that there are R outputs in the smart meter box terminal connected to phase C.

6. The load balancing method of a smart meter box terminal according to claim 5, characterized in that: The calculation formula of load balance index is: Bi_t+1=Fun(P(a_t+1 total), P(b_t+1 total), P(c_t+1 total)) Among them, Bi_t+1 represents the load balance index at the prediction time, that is, time t+1; Fun() is the load balance calculation function.

7. The load balancing method of a smart meter box terminal according to claim 3, characterized in that: The load balancing adjustment method includes the following steps: S351, calculating the total single-phase adjustable phase load of phases A, B, and C in the smart meter box terminal; S352, calculating the load balancing coefficient according to the total single-phase adjustable phase load of phases A, B, and C in the smart meter box terminal; S353, calculate the adjustable user phase, calculate the sample variance of the three-phase load imbalance after adjustment in combination with the load balancing coefficient, calculate the minimum sample variance of the three-phase load imbalance after adjustment, and obtain the adjusted user phase of each output channel of phases A, B, and C, that is, the updated power wiring configuration.

8. A smart meter box terminal, used to implement a load balancing method for a smart meter box terminal as claimed in any one of claims 1 to 7, characterized in that: The smart meter box terminal is used to provide power supply lines for all users in the preset area and supply power to users through output wiring; The smart meter box terminal automatically configures the power wiring configuration for all users; the smart meter box terminal manages the historical data of each user's power load and predicts the user's power load for a period of time in the future based on the historical data; Through the prediction results of each user's future power load, the load balance degree of the three-phase load in the future period of time is judged according to the load balancing judgment method, and whether the imbalance degree of the three-phase power load is within the preset threshold is calculated. If so, power is supplied according to the power wiring configuration; if not, the smart meter box terminal outputs the updated power wiring configuration, configures phases for all users according to the updated power wiring configuration, and the smart meter box terminal measures and reads meters for all users, and counts the power usage of each user.

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