Metering method under closed-loop operation of 220kV and below voltage class self-contained power plant users

Abstract

The invention provides a metering method under closed-loop operation of users of a self-contained power plant with the voltage class of 220kV and below, and belongs to the technical field of electricity charge metering. The problem that the electricity sale quantity, the demand quantity and the power plant surplus electricity on-grid electricity quantity are difficult to accurately meter under the closed-loop operation of users of a self-contained power plant with the voltage class of 220kV and below is solved. Comprising the following steps: S1, controlling the generating capacity of a self-contained power plant to be less than or equal to the electricity consumption required by a user; s2, configuring an automatic data acquisition mode of the 220kV transformer substation of the power grid; s3, calculating the electricity sale quantity and the maximum demand; the method is applied to electricity charge metering under closed-loop operation of users of a self-contained power plant with the voltage class of 220kV and below.

Description

Technical Field

[0001] The present invention provides a metering method for users with self - contained power plants operating in closed - loop under voltage levels of 220 kV and below, belonging to the technical field of electricity charge metering. Background Art

[0002] The key to the closed - loop operation of users with self - contained power plants under voltage levels of 220 kV and below lies in solving the metering and billing problems of closed - loop operation.

[0003] There are three technical problems in the metering of users with self - contained power plants operating in closed - loop under voltage levels of 220 kV and below: First, the problem of electricity quantity calculation: The forward electricity quantity of the substation billing meter may be the sum of the power flow electricity quantity + electricity consumption. The power flow electricity quantity is reflected in the reverse direction at the gateway, and the reverse electricity quantity contains the surplus electricity quantity of the power plant fed into the grid (that is, the reverse electricity quantity includes the power flow electricity quantity + the surplus electricity quantity fed into the grid). Existing metering technologies cannot correctly distinguish the mixed electricity quantity and demand.

[0004] Second, the problem of demand superposition: After closing the loop, the four power sources operate simultaneously. The maximum demand billing method should be the superposition calculation of the maximum demands of the four power sources. However, all four power sources may contain cross - power flow electricity quantity and demand, and it is impossible to correctly distinguish the two, which will cause the cross - power flow electricity quantity and demand of the four power sources to be all superimposed on the selling electricity billing meter, and may increase several times compared with the actual electricity consumption of the user.

[0005] Third, the problem of settlement of the surplus electricity quantity of the self - contained power plant fed into the grid: The surplus electricity quantity fed into the grid is reflected in the reverse electricity quantity, and the reverse electricity quantity contains the indistinguishable surplus electricity quantity of the self - contained power plant fed into the grid and the power flow electricity quantity, making it impossible to settle the surplus electricity quantity fed into the grid. Summary of the Invention

[0006] In order to solve the problem that it is difficult to accurately measure the sold electricity quantity, demand, and the surplus electricity quantity of the power plant fed into the grid for users with self - contained power plants operating in closed - loop under voltage levels of 220 kV and below, the present invention proposes a metering method for users with self - contained power plants operating in closed - loop under voltage levels of 220 kV and below.

[0007] The technical solution adopted by the present invention is as follows: A metering method for users with self - contained power plants operating in closed - loop under voltage levels of 220 kV and below, used for users with self - contained power plants in the closed - loop operation mode, includes the following steps: S1: Set the pre - condition for the electricity quantity of the self - contained power plant fed into the grid: Control the power generation of the self - contained power plant to be less than or equal to the electricity consumption required by the user; S2: Configure the automatic data acquisition method of the 220 kV substation of the power grid: After collecting the substation data, send it to the provincial dispatching and local dispatching simultaneously, and the collected data has directionality, that is, the outgoing bus is positive and the incoming bus is negative; S3: Calculate the sold electricity quantity and the maximum demand.

[0008] Further, a synchronous clock is equipped during the acquisition of substation data, and the acquisition frequency is set.

[0009] Further, on the basis of the precondition, the sold electricity quantity is calculated as the sum of the forward directions of each line minus the sum of the reverse directions of each line.

[0010] Further, the maximum demand is the maximum average value of the sum of the powers of each line in a continuous period of time in the current month.

[0011] Further, the acquisition frequency of substation data is at least once a minute.

[0012] Even further, the maximum demand is the maximum average value of the sum of the active powers of each line in a continuous period of fifteen minutes in the current month.

[0013] Even further, the demand value is provided by the production dispatching center, and the maximum demand value is calculated by the metering center.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: The metering method provided by the present invention can effectively solve the problem of inaccurate metering of sold electricity quantity and demand under the loop closing mode, and the concept of the present invention is simple, practical and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further describes the present invention with reference to the drawings: Figure 1 is a flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] As Figure 1 shown, the present invention provides a metering method for users with self-owned power plants operating in loop closing under voltage levels of 220 kV and below, which is mainly used for users with self-owned power plants operating in loop closing in voltage levels of 220 kV and below. For the above users, the present invention sets the precondition for the on-grid electricity quantity of their self-owned power plants, that is, it is set that the on-grid electricity quantity of the self-owned power plant = 0, that is, the generated electricity of the loop closing user is only for its own use, and no extra generated electricity is generated for it to go on the grid. In this way, the problem of metering the on-grid electricity quantity of the self-owned surplus of users operating in loop closing with self-owned power plants can be solved.

[0017] On the basis of the precondition, the sold electricity quantity can be calculated as the sum of the forward electricity quantities of all lines minus the sum of the reverse electricity quantities of all lines.

[0018] And a new mode for calculating the demand of this user is formed through dispatching automation, which is specifically as follows: Set the automatic data acquisition mode of the 220 kV substation in the power grid as: one transmission and two receptions, that is, after the substation data is collected, it is sent to the provincial dispatching center (also known as the central dispatching center, that is, the dispatching center of the provincial power company) and the local dispatching center (that is, the dispatching center of the prefecture-level city or county-level power company) simultaneously. The data collected by the substation is directional, that is, the outgoing bus is positive and the incoming bus is negative, and a synchronous clock is equipped to set the collection at least once every minute. This dispatching automation data acquisition method just solves the dilemma that the existing metering devices cannot measure the demand under the loop closing mode.

[0019] And according to the statistical method of the existing electricity meter demand, the maximum demand of the substation is statistically calculated, that is, the dispatching and control center provides the continuous fifteen-minute average value of the active power of all lines in the current month, and takes the maximum value of the monthly average value as the maximum demand for calculating the cost.

[0020] At the same time, the scientific nature of the method of the present invention is also verified as follows: 1. After communicating with the user and conducting a retrospective analysis on the surplus electricity fed into the grid by the user's self-provided power plant, the surplus electricity fed into the grid by the self-provided power plant has the condition of being zero. In this embodiment, the user with the self-provided power plant operating in loop closing mode is connected with a total of four lines and four power sources are connected. Control the power generation of the self-provided power plant of the user to be less than or equal to its electricity consumption. In this way, it can be ensured that the self-provided power plant has no surplus electricity to be fed into the grid, that is, the forward electricity and the reverse electricity can be effectively distinguished. Based on this, calculate the electricity sold by the power grid = (Line 1 + Line 2 + Line 3 + Line 4) forward electricity - (Line 1 + Line 2 + Line 3 + Line 4) reverse electricity.

[0021] 2. Through the user's simulation measurement of electricity quantity, it is consistent with the manual measurement of electricity quantity, and the fee can be calculated normally, and the calculation result is correct and error-free, and the user has not raised any objections.

[0022] The electricity consumption measured by the user through the existing electricity measurement method is consistent with the maximum demand calculated by using the method of the present invention, and the present invention uses a method that conforms to the existing electricity charge metering standards and regulations to calculate the maximum demand, which is legal and compliant.

[0023] 3. Finally, sign a loop closing operation electricity charge metering agreement.

[0024] The metering under the loop closing operation mode of users with self-provided power plants at 220 kV and below voltage levels is a new practice and a new direction of metering that has no previous operation precedent. This metering method takes solving the metering dilemma under the loop closing operation mode of 220 kV users with self-provided power plants as the starting point: 1. Creatively put forward the metering precondition of "zero surplus electricity fed into the grid" Under the premise that accurate metering cannot be achieved no matter where the meter is installed or how many meters are installed in the closed-loop mode, the present invention creatively proposes the metering precondition of "zero surplus online electricity", solves the metering problem in the closed-loop mode, proposes a closed-loop operation electricity fee metering scheme and obtains user recognition to realize closed-loop operation.

[0025] 2. Propose a new demand calculation model In the case that the existing metering technology and devices cannot accurately obtain the demand value measurement requirements in the closed-loop mode, resulting in the inability to calculate the electricity fee, the present invention solves the problem of demand metering from another perspective by providing the demand value by the production dispatch center and calculating the demand value by the metering center, and proposes a new demand calculation mode. This is a forward-looking technical solution practice in the current closed-loop mode for measuring demand.

[0026] Since traditional energy meters cannot complete the energy measurement problem of the closed-loop operation mode of the 220kV power grid system with self-provided power plants, a closed-loop operation electricity fee measurement method was creatively proposed and recognized by users to achieve closed-loop operation. The solution and practice are groundbreaking, providing ideas for metering-related issues of the domestic 220kV self-provided power plant users in the closed-loop operation mode, and have great reference value.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metering method for closed-loop operation of a user with a self-provided power plant at a voltage level of 220 kV or below, characterized in that: For users with self-provided power plants in closed-loop operation mode, including the following steps: S1: Set the precondition for the grid-connected power of the self-provided power plant: control the power generation of the self-provided power plant to be less than or equal to the power consumption required by the user; S2: Configure the automatic data collection method of the 220kV substation of the power grid: collect the substation data and send it to the provincial dispatching station and the local dispatching station at the same time, and the collected data is directional, that is, the outgoing bus is positive and the incoming bus is negative; S3: Calculate the electricity sales amount and maximum demand.

2. According to claim 1, a metering method for closed-loop operation of a 220 kV or lower voltage level with a self-provided power plant user, characterized in that: When collecting substation data, a synchronous clock is provided and the collection frequency is set.

3. According to claim 1, a metering method for closed-loop operation of a 220 kV or lower voltage level with a self-provided power plant user, characterized in that: The amount of electricity sold is calculated based on the preconditions = the sum of the forward power of each line - the sum of the reverse power of each line.

4. The metering method for a 220 kV or lower voltage level with a self-provided power plant user under closed-loop operation according to claim 1 is characterized in that: The maximum demand is the maximum average value of the sum of the power of each line in that month over a continuous period of time.

5. According to claim 2, a metering method for closed-loop operation of a 220 kV or lower voltage level with a self-provided power plant user, characterized in that: The frequency of collecting substation data is at least once a minute.

6. The metering method for a 220 kV or lower voltage level with a self-provided power plant user under closed-loop operation according to claim 4 is characterized in that: The maximum demand is the maximum average value of the sum of the active power of each line in that month within a continuous fifteen-minute period.

7. The metering method for a 220 kV or lower voltage level with a self-provided power plant user under closed-loop operation according to claim 6 is characterized in that: The production scheduling center provides the demand value, and the measurement center calculates the maximum demand value.

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