A decomposition method for meter box load identification

Abstract

The present invention relates to a decomposition method for meter box load identification, and belongs to the field of smart grid technology. It includes the following steps: S1, collecting the voltage and current at the meter box incoming line through the load identification terminal, obtaining the basic load characteristic quantity, and constructing the basic load characteristic quantity sequence of the meter box incoming line; at the same time, the load identification terminal obtains the active power and reactive power of the meter at a frequency of once a minute, and constructs the basic load characteristic quantity sequence of each meter; S2, decomposing different load types according to the power change characteristics, grasping the core load characteristic quantity according to the characteristics of different types of loads, and judging the user according to the difference in the basic load characteristic quantity. The present invention can solve the problems of equipment cost, construction difficulty, and the problem that meter data cannot complete load identification alone.

Description

Technical Field

[0001] The invention relates to a decomposition method for meter box load identification, and belongs to the technical field of smart grid. Background Art

[0002] With the development of load identification technology, more and more load identification terminals of various types are used for the collection and analysis of electricity consumption information on the user side. However, since it focuses on the collection and analysis of electricity consumption information on the user side, a terminal device needs to use a mutual inductor to connect each meter in the meter box to obtain electricity consumption information. In addition, the load identification terminal can collect electricity consumption information of up to 12 meters. Therefore, when the number of meters in the meter box exceeds 12, a load identification terminal needs to be installed. This has kept the equipment cost high and increased the difficulty of construction. If only one load identification terminal is installed at the meter box, this will greatly reduce the equipment cost and construction difficulty. However, this requires installing a load identification module in the meter or using meter data to assist in load identification. Considering the cost issue, using meter data to complete load identification has become the only option. However, since the meter cannot collect electricity consumption information continuously and for a long time and cannot accurately identify the electrical equipment and electricity consumption time only through meter data, it is necessary to use the meter box load decomposition method. Summary of the invention

[0003] The object of the present invention is to provide a decomposition method for meter box load identification, which can solve the problems of equipment cost, construction difficulty and the problem that meter data cannot complete load identification alone.

[0004] The decomposition method of the meter box load identification of the present invention comprises the following steps:

[0005] S1. The voltage and current at the meter box inlet are collected through the load identification terminal to obtain the basic load characteristic quantity, and a basic load characteristic quantity sequence of the meter box inlet terminal is constructed;

[0006] At the same time, the load identification terminal obtains the active power and reactive power of the electric meter once a minute to construct the basic load characteristic quantity sequence of each electric meter;

[0007] S2. Decompose different load types according to the power variation characteristics, grasp the core load characteristic quantities according to the characteristics of different types of loads, and determine the users based on the difference in basic load characteristic quantities.

[0008] Furthermore, the basic load characteristic quantity at the inlet end of the meter box includes at least one of active power, reactive power and operating time.

[0009] Furthermore, the basic load characteristic quantity difference sequence of each electric meter includes at least one of active power and reactive power.

[0010] Furthermore, the load types include electric heating loads, inductive loads, loads with periodic power fluctuations, and variable frequency loads;

[0011] The electric heating load is a load that has only power changes when turned on and off, can reach steady-state power operation in an instant, and does not generate reactive power;

[0012] The inductive load is a load that generates reactive power when the power is turned on, and the reactive power increases when the device is turned on, accompanied by an increase in active power, and the increase can instantly reach steady-state reactive power and active power operation;

[0013] The load with periodic power fluctuation is a load with periodic oscillation of active power;

[0014] The variable frequency load is a load whose active power and reactive power increase slowly during startup.

[0015] Furthermore, when the load type is electric heating load, the specific steps of step 2 are as follows:

[0016] A2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power in the basic load characteristic quantity of each meter from one minute before the equipment starts to one minute after the equipment stops;

[0017] A2.2: Compare the active power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power of each meter has changed, and decompose the meters whose active power has changed during the operation of the equipment;

[0018] A2.3: Based on the active power in the basic load characteristic quantity of each meter and the active power in the basic load characteristic quantity of the meter box inlet terminal during the load operation period, calculate the average active power of each meter and the average active power of the meter box inlet terminal, and calculate the difference between the two average values;

[0019] A2.4: Compare the difference between the average active power of each meter and the average active power of the meter box incoming line end, and find that the electric heating load equipment is used by users with the smallest difference.

[0020] Furthermore, when the load type is an inductive load, the specific steps of step 2 are as follows:

[0021] B2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is running to one minute after the equipment stops;

[0022] B2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment;

[0023] B2.3: Based on the active power and reactive power in the basic load characteristic quantities of each meter during the load operation period and the active power and reactive power in the basic load characteristic quantities of the meter box inlet terminal, calculate the average active power and reactive power of each meter and the average active power and reactive power of the meter box inlet terminal, and perform the difference calculation on the average active power and reactive power obtained from the two;

[0024] B2.4: Compare the difference between the average active power and reactive power of each meter and the average active power and reactive power of the meter box incoming line end, and find that the inductive load equipment is used by the user with the smallest difference.

[0025] Furthermore, when the load type is a load with periodic power fluctuations, the specific steps of step 2 are as follows:

[0026] C2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is running to one minute after the equipment stops;

[0027] C2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment;

[0028] C2.3: Calculate the average active power and reactive power of each meter and the average active power and reactive power of the meter box inlet terminal according to the active power and reactive power of the basic load characteristic quantity of each meter during the load operation period and the active power and reactive power of the basic load characteristic quantity of the meter box inlet terminal, and make a difference calculation between the average active power and reactive power obtained from the two;

[0029] C2.4: Compare the difference between the average active power and reactive power of each meter and the average active power and reactive power of the meter box incoming line end, and find that the load with periodic power fluctuation is the user with the smallest difference.

[0030] Furthermore, when the load type is a variable frequency load, the specific steps of step 2 are as follows:

[0031] D2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is operated to one minute after the equipment stops;

[0032] D2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment;

[0033] D2.3: According to the load operation time in the basic load characteristic quantity at the meter box inlet end and the time when the active power at the meter box inlet end enters the steady-state operation, the two are subtracted to obtain the equipment startup time, and then according to the active power and reactive power in the basic load characteristic quantity of each meter and the active power and reactive power in the basic load characteristic quantity of the meter box inlet end, the active power increase rate and reactive power increase rate of each meter and the active power increase rate and reactive power increase rate at the meter box are calculated, and the difference between the active power increase rate and reactive power increase rate obtained from the two is calculated;

[0034] D2.4: Based on the active power in the basic load characteristic quantity of the electric meter and the active power in the basic load characteristic quantity of the meter box inlet, calculate the average active power of each electric meter during the stable operation of the equipment and the average active power at the meter box inlet, and calculate the difference between the two;

[0035] D2.5: Based on the difference between D2.3 and D2.4, it is concluded that variable frequency load equipment is used by users with the smallest difference.

[0036] The beneficial effects of the present invention are as follows: the decomposition method of the meter box load identification only needs to install the mutual inductor at the meter box incoming line, thus reducing the installation of the mutual inductor on the user side and reducing the construction difficulty.

[0037] The decomposition method of meter box load identification can realize load identification without installing identification modules in the meter while reducing meter box identification terminals, thus effectively reducing costs.

[0038] Since fewer transformers are connected, the size of the load identification terminal equipment is also reduced, which makes on-site installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a general flow chart of the decomposition method of the meter box load identification of the present invention;

[0040] Figure 2 This is a flow chart of step 2 of the electric heating load in the present invention;

[0041] Figure 3 This is a flow chart of step 2 for inductive loads in the present invention;

[0042] Figure 4 This is a flow chart of step 2 of the power periodic fluctuation load in the present invention;

[0043] Figure 5 This is the flow chart of step 2 of the variable frequency load in the present invention. DETAILED DESCRIPTION

[0044] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0045] like Figure 1 As shown, the decomposition method of the meter box load identification of the present invention includes the following steps:

[0046] S1. The voltage and current at the meter box inlet are collected through the load identification terminal to obtain the basic load characteristic quantity, and a basic load characteristic quantity sequence at the meter box inlet end and a basic load characteristic quantity difference sequence of the meter box are constructed; the basic load characteristic quantity includes at least one of active power, reactive power and operating time;

[0047] At the same time, the load identification terminal obtains the active power and reactive power of the electric meter at a frequency of once a minute, and constructs a basic load characteristic quantity sequence of each electric meter; the basic load characteristic quantity includes at least one of the active power and the reactive power;

[0048] S2. Decompose different load types according to the power variation characteristics, grasp the core load characteristic quantities according to the characteristics of different types of loads, and determine the users based on the difference in basic load characteristic quantities.

[0049] Load types include electric heating loads, inductive loads, loads with periodic power fluctuations, and variable frequency loads;

[0050] For electric heating loads, only power changes when they are turned on and off, and they can reach steady-state power operation in an instant (within 0.2s) without generating reactive loads. The start and stop of this type of load can only be determined by the instantaneous rise and fall of power. The differences between different electric heating loads are only reflected in the power size and continuous operation time.

[0051] Inductive loads generate reactive power when the power is turned on, and the reactive power increases when the equipment is turned on, accompanied by changes in active power, and can reach steady-state power operation in an instant; therefore, the start and stop of such equipment is determined by the increase and decrease of active power and reactive power. The differences between different inductive loads are reflected in the size of active power, reactive power and continuous operation time.

[0052] For loads with periodic power fluctuations, the active power presents periodic oscillations. Therefore, it is only necessary to calculate the average power of the periodic oscillations, the range of the oscillations and the time of the periodic oscillations. The differences between different loads with periodic power fluctuations are reflected in the average power of the oscillations, the size of the oscillation range and the length of the oscillation time.

[0053] The variable frequency load is a load with a slow increase in active power. It is necessary to calculate the active power, reactive power increase rate, and average power during the startup time and stable operation period. The differences between different variable frequency loads are reflected in the different active power, reactive power increase rate, startup time, and average power when entering the steady state.

[0054] like Figure 2 As shown in the figure, when the load type is electric heating load, the specific steps of step 2 are as follows:

[0055] A2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power in the basic load characteristic quantity of each meter from one minute before the equipment is operated to one minute after the equipment stops; since the electric heating load does not generate reactive power, the reactive power is not obtained or calculated here, and the reactive power is regarded as 0;

[0056] A2.2: Compare the active power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power of each meter has changed, and decompose the meters whose active power has changed during the operation of the equipment;

[0057] A2.3: Based on the active power in the basic load characteristic quantity of each meter and the active power in the basic load characteristic quantity of the meter box inlet terminal during the load operation period, calculate the average active power of each meter and the average active power of the meter box inlet terminal, and calculate the difference between the two average values;

[0058] A2.4: Compare the difference between the average active power of each meter and the average active power of the meter box incoming line end, and find that the electric heating load equipment is used by users with the smallest difference.

[0059] like Figure 3 As shown in the figure, when the load type is an inductive load, the specific steps of step 2 are as follows:

[0060] B2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is running to one minute after the equipment stops;

[0061] B2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment;

[0062] B2.3: Based on the active power and reactive power in the basic load characteristic quantities of each meter during the load operation period and the active power and reactive power in the basic load characteristic quantities of the meter box inlet terminal, calculate the average active power and reactive power of each meter and the average active power and reactive power of the meter box inlet terminal, and perform the difference calculation on the average active power and reactive power obtained from the two;

[0063] B2.4: Compare the difference between the average active power and reactive power of each meter and the average active power and reactive power of the meter box incoming line end, and find that the inductive load equipment is used by the user with the smallest difference.

[0064] like Figure 4 As shown, when the load type is a load with periodic power fluctuations, the specific steps of step 2 are as follows:

[0065] C2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is running to one minute after the equipment stops;

[0066] C2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment;

[0067] C2.3: Calculate the average active power and reactive power of each meter and the average active power and reactive power of the meter box inlet terminal according to the active power and reactive power of the basic load characteristic quantity of each meter during the load operation period and the active power and reactive power of the basic load characteristic quantity of the meter box inlet terminal, and make a difference calculation between the average active power and reactive power obtained from the two;

[0068] C2.4: Compare the difference between the average active power and reactive power of each meter and the average active power and reactive power of the meter box incoming line end, and find that the load with periodic power fluctuation is the user with the smallest difference.

[0069] like Figure 5 As shown in the figure, when the load type is variable frequency load, the specific steps of step 2 are as follows:

[0070] D2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is operated to one minute after the equipment stops;

[0071] D2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment;

[0072] D2.3: According to the load operation time in the basic load characteristic quantity at the meter box inlet end and the time when the active power at the meter box inlet end enters the steady-state operation, the two are subtracted to obtain the equipment startup time, and then according to the active power and reactive power in the basic load characteristic quantity of each meter and the active power and reactive power in the basic load characteristic quantity of the meter box inlet end, the active power increase rate and reactive power increase rate of each meter and the active power increase rate and reactive power increase rate at the meter box are calculated, and the difference between the active power increase rate and reactive power increase rate obtained from the two is calculated;

[0073] D2.4: Based on the active power in the basic load characteristic quantity of the electric meter and the active power in the basic load characteristic quantity of the meter box inlet, calculate the average active power of each electric meter during the stable operation of the equipment and the average active power at the meter box inlet, and calculate the difference between the two;

[0074] D2.5: Based on the difference between D2.3 and D2.4, it is concluded that variable frequency load equipment is used by users with the smallest difference.

[0075] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A decomposition method for identifying meter box load, characterized in that: The steps include: S1. The voltage and current at the meter box inlet are collected through the load identification terminal to obtain the basic load characteristic quantity, and a basic load characteristic quantity sequence of the meter box inlet terminal is constructed; At the same time, the load identification terminal obtains the active power and reactive power of the electric meter once a minute to construct the basic load characteristic quantity sequence of each electric meter; The basic load characteristic quantity of the meter box inlet terminal includes at least one of the active power, reactive power and load operation time of the meter box inlet terminal; The basic load characteristic quantity of each electric meter includes at least one of the active power and reactive power of each electric meter; S2. Decompose different load types according to the power variation characteristics, grasp the core load characteristic quantity according to the characteristics of different types of loads, and determine the users according to the difference of basic load characteristic quantity; The load types include electric heating loads, inductive loads, loads with periodic power fluctuations, and variable frequency loads; The electric heating load is a load that only has active power changes when turned on and off, can reach steady-state power operation in an instant, and does not generate reactive power; The inductive load is a load that generates reactive power when the power is turned on, and the reactive power increases when the device is turned on, accompanied by an increase in active power, and the increase can instantly reach steady-state reactive power and active power operation; The load with periodic power fluctuation is a load with periodic oscillation of active power; The variable frequency load is a load whose active power and reactive power increase slowly during startup.

2. The decomposition method for meter box load identification according to claim 1, characterized in that: When the load type is electric heating load, the specific steps of step 2 are as follows: A2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power in the basic load characteristic quantity of each meter from one minute before the equipment starts to one minute after the equipment stops; A2.2: Compare the active power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power of each meter has changed, and decompose the meters whose active power has changed during the operation of the equipment; A2.3: Based on the active power in the basic load characteristic quantity of each meter and the active power in the basic load characteristic quantity of the meter box inlet terminal during the load operation period, calculate the average active power of each meter and the average active power of the meter box inlet terminal, and calculate the difference between the two average values; A2.4: Compare the difference between the average active power of each meter and the average active power of the meter box incoming line end, and find that the electric heating load equipment is used by users with the smallest difference.

3. The decomposition method for meter box load identification according to claim 1, characterized in that: When the load type is inductive load, the specific steps of step 2 are as follows: B2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is running to one minute after the equipment stops; B2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment; B2.3: Based on the active power and reactive power in the basic load characteristic quantities of each meter during the load operation period and the active power and reactive power in the basic load characteristic quantities of the meter box inlet terminal, calculate the average active power and reactive power of each meter and the average active power and reactive power of the meter box inlet terminal, and perform the difference calculation on the average active power and reactive power obtained from the two; B2.4: Compare the difference between the average active power and reactive power of each meter and the average active power and reactive power of the meter box incoming line end, and find that the inductive load equipment is used by the user with the smallest difference.

4. The decomposition method for meter box load identification according to claim 1, characterized in that: When the load type is a load with periodic power fluctuations, the specific steps of step 2 are as follows: C2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is running to one minute after the equipment stops; C2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment; C2.3: Calculate the average active power and reactive power of each meter and the average active power and reactive power of the meter box inlet terminal according to the active power and reactive power of the basic load characteristic quantity of each meter during the load operation period and the active power and reactive power of the basic load characteristic quantity of the meter box inlet terminal, and make a difference calculation between the average active power and reactive power obtained from the two; C2.4: Compare the difference between the average active power and reactive power of each meter and the average active power and reactive power of the meter box incoming line end, and find that the load with periodic power fluctuation is the user with the smallest difference.

5. The decomposition method for meter box load identification according to claim 1, characterized in that: When the load type is variable frequency load, the specific steps of step 2 are as follows: D2.1: According to the load operation time in the basic load characteristic quantity at the inlet end of the meter box, obtain the active power and reactive power in the basic load characteristic quantity of each meter from one minute before the equipment is operated to one minute after the equipment stops; D2.2: Compare the active power and reactive power in the basic load characteristic quantity of each meter one minute before and one minute after the equipment is started and stopped, determine whether the active power and reactive power of each meter have changed, and decompose the meters whose active power and reactive power have changed during the operation of the equipment; D2.3: According to the load operation time in the basic load characteristic quantity at the meter box inlet end and the time when the active power at the meter box inlet end enters the steady-state operation, the two are subtracted to obtain the equipment startup time, and then according to the active power and reactive power in the basic load characteristic quantity of each meter and the active power and reactive power in the basic load characteristic quantity of the meter box inlet end, the active power increase rate and reactive power increase rate of each meter and the active power increase rate and reactive power increase rate at the meter box are calculated, and the difference between the active power increase rate and reactive power increase rate obtained from the two is calculated; D2.4: Based on the active power in the basic load characteristic quantity of the electric meter and the active power in the basic load characteristic quantity of the meter box inlet, calculate the average active power of each electric meter during the stable operation of the equipment and the average active power at the meter box inlet, and calculate the difference between the two; D2.5: Based on the difference between D2.3 and D2.4, it is concluded that variable frequency load equipment is used by users with the smallest difference.

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