Enterprise power consumption control method

Abstract

The invention discloses an enterprise power consumption control method, which comprises the following steps of: dividing a collected power value into a non-transferable load and a transferable load, setting a transfer cost function, mapping rectangular coordinates to polar coordinates, combining the power consumption demand of an enterprise, taking the minimum power consumption cost of a billing cycle as a target, and adopting a rotation mode to control the power consumption of the enterprise. The load transfer time of the power consumption cost is calculated, load transfer control is carried out, the power consumption cost of an enterprise can be reduced, and the power consumption cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of power systems, and in particular relates to a method for controlling electricity consumption in an enterprise. Background Art

[0002] With the development of society, the electricity consumption in my country is becoming more and more severe, and the gap in electricity consumption is large, especially during peak hours of electricity consumption, the power supply pressure is high. In this case, in order to reduce peak electricity consumption and alleviate the pressure of peak power supply, the power supply department adopts a time-based pricing method with different billing prices of "peak hours, normal hours, and valley hours" to guide electricity users to reduce peak electricity consumption, thereby reducing the pressure of power supply and ensuring the safe operation of the power grid. The daily electricity cost of an enterprise includes demand charges and electricity charges, among which the demand charges are related to the load size of the enterprise's electricity consumption, and the electricity charges are related to the amount of electricity consumed by the enterprise. Enterprises can adjust their electricity consumption plans according to the time-based pricing method adopted by the power supply department to reduce electricity costs, such as reducing the demand charges by reducing the power difference between peak, valley and flat electricity consumption, or reducing electricity charges by improving the electricity consumption system. However, the electricity control method in the prior art will bring great inconvenience to the production of enterprises and the lives of employees. Therefore, a control method is needed to reduce the electricity cost of enterprises without affecting production and the comfort of employees' lives. Summary of the invention

[0003] In order to reduce the impact of the electricity control method in the existing technology on enterprise production and employees' lives, the following technical solutions are provided:

[0004] A method for controlling electricity consumption of an enterprise comprises the following steps:

[0005] S1- Determination of enterprise electricity consumption:

[0006] The power consumption function We is set to calculate the cumulative power consumption of the enterprise during the electricity billing period, and the cumulative power consumption of the enterprise is divided into transferable load La and non-transferable load Lb, and the maximum power demand Usy of the enterprise is determined according to the enterprise power consumption function We;

[0007] S2- Obtaining electricity unit price and demand unit price:

[0008] Determine the demand unit price NPr and the electricity unit price Pr(t) according to the time-sharing electricity price policy of the enterprise's location;

[0009] S3-Representation of load untransferred charges:

[0010] Combine the enterprise electricity consumption determined in step S1 with the demand unit price NPr and the electricity unit price Pr(t) determined in step S2; construct the load non-transfer cost function Fe;

[0011] S4- Expression of load transfer charges:

[0012] The transfer cost function Ku is constructed and incorporated into the load non-transfer cost function Fe to construct the load transfer cost function Fe′.

[0013] S5-Power consumption control:

[0014] Determine the minimum value of the load transfer cost function Fe′ and its corresponding transfer coefficient j, and use load control equipment to control electricity consumption.

[0015] Furthermore, in the step S1-determining the enterprise's electricity consumption, the electricity consumption function We is established by integration to calculate the enterprise's cumulative electricity consumption during the billing period; the total electricity consumption is divided into transferable load La and non-transferable load Lb based on historical data, and the maximum demand Usy is calculated using the electricity consumption change magnification factor and average power.

[0016] Furthermore, the power consumption function We and the maximum demand Usy are as follows:

[0017]

[0018]

[0019] Among them: t1 represents the starting time point of the electricity billing cycle; t2 represents the ending time point of the electricity billing cycle; Wt is the total electricity consumption for time t; Δt is a small time increment; We is the total energy consumption from t1 to t2; C is the power consumption change magnification; (Wt-15, t) is the average power in the time period from t to (t-15), and the time difference between t and t-15 is 15 minutes.

[0020] Furthermore, in the step S2 - obtaining the electricity unit price and the demand unit price, the demand unit price NPr and the electricity unit price Pr(t) are obtained according to the electricity price policy of the enterprise's location, and the demand unit price NPr and the electricity unit price Pr(t) are respectively a set of fixed arrays.

[0021] Furthermore, in the representation of the load non-transfer cost in step S3, the load non-transfer cost function Fe is constructed by combining the maximum demand Usy, the demand unit price NPr and the electricity unit price Pr(t).

[0022] Furthermore, the load non-transfer cost function Fe is as follows:

[0023]

[0024] Among them, Usy is the maximum demand; NPr is the demand unit price; Pr(t) is the electricity price at time t; Wt.La is the power of the transferable load La at time t; Wt.Lb is the power of the non-transferable load Lb at time t.

[0025] Furthermore, in the representation of step S4-load transfer cost, the cost function Ku is constructed by combining the transfer angle j and the transfer cost value ks, and the time and power information in the load non-transferred cost function Fe is mapped to the polar coordinate system for easy analysis, and then the load transfer cost function Fe′ is determined by combining the polar coordinate mapping and the transfer cost.

[0026] Furthermore, the cost function Ku and the load transfer fee function Fe′ are as follows:

[0027]

[0028]

[0029] in:

[0030] U new sy is the new maximum power demand after rotation;

[0031] It represents the cost after the transferable load La is transferred;

[0032] Represents the cost of the non-transferable load Lb.

[0033] Furthermore, in the step S5-power consumption control, the load transfer cost function Fe' is traversed, and the transfer coefficient j corresponding to the minimum value of the load transfer cost function Fe' is recorded, so as to determine the transfer time Tz, and then use the load control device to perform power consumption control.

[0034] The enterprise electricity control method of the present invention divides the collected power values ​​into non-transferable loads and transferable loads, sets a transfer cost function, maps rectangular coordinates to polar coordinates, combines the enterprise's electricity demand, takes the minimum electricity cost of the billing period as the goal, adopts a rotation method, calculates the load transfer time of the electricity cost, and performs load transfer control, which can reduce the enterprise's electricity costs and reduce electricity costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is an overall flow chart of the enterprise electricity consumption control method of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is described clearly and completely with specific embodiments in conjunction with the accompanying drawings. It should be understood that the described embodiments are only used to illustrate the present invention, but not to limit the scope of the present invention.

[0037] Embodiment 1: A method for controlling electricity consumption of an enterprise, according to Figure 1 As shown, the following steps are included:

[0038] S1- Determination of enterprise electricity consumption:

[0039] The power consumption function We is set to calculate the cumulative power consumption of the enterprise during the electricity billing period, and the cumulative power consumption of the enterprise is divided into transferable load La and non-transferable load Lb, and the maximum power demand Usy of the enterprise is determined according to the enterprise power consumption function We;

[0040] S2- Obtaining electricity unit price and demand unit price:

[0041] Determine the demand unit price NPr and the electricity unit price Pr(t) according to the time-sharing electricity price policy of the enterprise's location;

[0042] S3-Representation of load untransferred charges:

[0043] Combine the enterprise electricity consumption determined in step S1 with the demand unit price NPr and electricity unit price Pr(t) determined in step S2 to construct a load non-transfer cost function Fe;

[0044] S4- Expression of load transfer charges:

[0045] Construct the transfer cost function Ku and substitute it into the load non-transfer cost function Fe to construct the load transfer cost function Fe′.

[0046] S5-Power consumption control:

[0047] Determine the minimum value of the load transfer cost function Fe' and its corresponding transfer coefficient j, and use load control equipment to control electricity consumption.

[0048] Furthermore, the step S1-determining the enterprise's electricity consumption includes the following steps:

[0049] S1.1-Establishment of electricity consumption function We:

[0050] Construct the power consumption function We as shown below:

[0051]

[0052] Where: t1 represents the start time of the electricity billing cycle; t2 represents the end time of the electricity billing cycle; Wt is the total electricity consumption in time t; Δt is a small time increment; We is the total amount of electricity consumption from t1 to t2.

[0053] S1.2-Load Division:

[0054] According to the historical electricity consumption data of the enterprise, the total energy consumption of the enterprise is divided into transferable load La and non-transferable load Lb. The load division method is already disclosed in the prior art, such as the microgrid transferable load scheduling and energy storage control strategy released by East China University of Science and Technology.

[0055] S1.3-Determination of maximum demand Usy:

[0056] The maximum demand Usy is determined according to the following formula:

[0057]

[0058] Among them, C is the power consumption change magnification; (Wt-15, t) is the average power from t to (t-15), and the time difference between t and t-15 is 15 minutes;

[0059] Preferably, in this embodiment, the power consumption change magnification factor C is 4.

[0060] Furthermore, in the step S2-obtaining the electricity unit price and the demand unit price, the demand unit price NPr and the electricity unit price Pr(t) are respectively a set of fixed arrays determined according to the time-sharing electricity price policy of the enterprise's location;

[0061] Furthermore, in the step S3-expression of the load non-transfer cost, the load non-transfer cost function Fe shown in the following formula is constructed to express the load non-transfer cost:

[0062]

[0063] Among them, Usy is the maximum demand; NPr is the demand unit price; Pr(t) is the electricity price at time t; Wt.La is the power of the transferable load La at time t; Wt.Lb is the power of the non-transferable load Lb at time t.

[0064] Furthermore, the step S4-expression of load transfer costs includes the following steps:

[0065] S4.1-Constructing cost function:

[0066] Construct the cost function Ku as shown below:

[0067]

[0068] Wherein, j is the transfer angle, 0<=j<360; ks is the transfer cost value, which is a constant, determined by the cost of the enterprise's load transfer, and the typical value is [0,0.02];

[0069] S4.2-Polar Coordinate Mapping of Load Untransferred Cost Function:

[0070] Taking time t as the angle and total power Wt as the amplitude, the power Wt.La of the transferable load La, the power Wt.Lb of the non-transferable load Lb and the unit price of electricity Pr(t) are mapped to the same polar coordinates, and the following polar coordinate function after polar coordinate mapping is obtained:

[0071]

[0072] W(θ)=Wt

[0073] Pr (θ) = Pr (t)

[0074] W(θ).La=Wt.La

[0075] W(θ).Lb=Wt.Lb

[0076] in:

[0077] θ is the angle corresponding to time t: 00:00 is 0 degrees, 12:00 is 180 degrees, and 24:00 is 360 degrees;

[0078] M(t) is the number of minutes between time t and 00:00:00 of the current day;

[0079] W(θ) is the amplitude of the total power Wt mapped in the polar coordinate system;

[0080] W(θ).La is the power polar coordinate function of the transferable load La;

[0081] W(θ).Lb is the power polar coordinate function of the non-transferable load Lb;

[0082] Pr(θ) is the polar coordinate function of the unit price of electricity.

[0083] S4.3-Determination of load transfer charge function:

[0084] Substituting the mapped polar coordinate function into the load non-transfer cost function Fe, we get the following load transfer cost function Fe′:

[0085]

[0086]

[0087] in:

[0088] U new sy is the new maximum power demand after rotation;

[0089] It represents the cost after the transferable load La is transferred;

[0090] Represents the cost of the non-transferable load Lb.

[0091] Furthermore, the step S5-power consumption control includes the following steps:

[0092] S5.1-Traversal of load transfer cost function Fe′:

[0093] With j=j+1, in the range of j<360, traverse and calculate the value of the load transfer cost function Fe′, and record j and the corresponding value of Fe′;

[0094] S5.2—Minimum value of load transfer function:

[0095] Find the minimum value of the load transfer cost function Fe′, find the corresponding j value, and calculate the transfer time: Tz = j minutes;

[0096] S5.3-Equipment Load Control:

[0097] The transferable load time value for power consumption control is obtained as j minutes, and load control equipment is used for power consumption control.

[0098] Example 2: An engineering example of controlling electricity consumption of a steel enterprise based on the enterprise electricity consumption control method described in Example 1:

[0099] 1. Enterprise electricity consumption before load transfer:

[0100] The company's electricity demand in January was 4,822 kW, with a total electricity consumption of 1.18 million kWh, including 830,000 kWh of peak electricity consumption, 80,000 kWh of valley electricity consumption, and 270,000 kWh of average electricity consumption. The unit price of demand was 40.5 yuan / kW, and the peak, valley and average electricity prices were 1.31, 0.28 and 0.75 yuan respectively. The total cost was 1.507499 million yuan.

[0101] 2. Load transfer calculation:

[0102] The average preheating load and warm water load that can be transferred is 342kW, the transfer cost is fixed at 0.02, and the calculated transfer time is 245 minutes;

[0103] 3. Enterprise electricity consumption after load transfer:

[0104] The electricity demand is 4482kW, with peak consumption of 770,000 kWh, valley consumption of 130,000 kWh, and average consumption of 280,000 kWh. The total cost is: 1,436,957 yuan.

[0105] 4. Beneficial effects:

[0106] The total electricity cost of the enterprise before the load transfer was 1,507,499 yuan, and the total electricity cost of the enterprise after the load transfer was 1,436,957 yuan. The use of the enterprise electricity control method of the present invention reduces the total electricity cost of the enterprise by 4.679%, which helps to reduce electricity costs.

[0107] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A method for controlling electricity consumption of an enterprise, characterized in that: The steps include: S1- Determination of enterprise electricity consumption: The power consumption function We is set to calculate the cumulative power consumption of the enterprise during the electricity billing period, and the cumulative power consumption of the enterprise is divided into transferable load La and non-transferable load Lb, and the maximum power demand Usy of the enterprise is determined according to the enterprise power consumption function We; S2- Obtaining electricity unit price and demand unit price: Determine the demand unit price NPr and the electricity unit price Pr(t) according to the time-sharing electricity price policy of the enterprise's location; S3-Representation of load untransferred charges: Combine the enterprise electricity consumption determined in step S1 with the demand unit price NPr and electricity unit price Pr(t) determined in step S2 to construct a load non-transfer cost function Fe; S4- Expression of load transfer charges: Construct the transfer cost function Ku and bring it into the load non-transfer cost function Fe, so as to construct the load transfer cost function Fe′. S5-Power consumption control: Determine the minimum value of the load transfer cost function Fe' and its corresponding transfer coefficient j, and use load control equipment to control electricity consumption.

2. The enterprise electricity control method according to claim 1, characterized in that: In the step S1-determining the enterprise's electricity consumption, the electricity consumption function We is established by integration to calculate the enterprise's cumulative electricity consumption during the billing period; the total electricity consumption is divided into transferable load La and non-transferable load Lb based on historical data, and the maximum demand Usy is calculated using the electricity consumption change magnification factor and average power.

3. The enterprise electricity control method according to claim 2, characterized in that: The power consumption function We and the maximum demand Usy are as follows: Among them: t1 represents the starting time point of the electricity billing cycle; t2 represents the ending time point of the electricity billing cycle; Wt is the total electricity consumption for time t; Δt is a small time increment; We is the total energy consumption from t1 to t2; C is the power consumption change magnification; (Wt-15, t) is the average power in the time period from t to (t-15), and the time difference between t and t-15 is 15 minutes.

4. The enterprise electricity control method according to claim 1, characterized in that: In the step S2-obtaining the electricity unit price and the demand unit price, the demand unit price NPr and the electricity unit price Pr(t) are obtained according to the electricity price policy of the enterprise's location, and the demand unit price NPr and the electricity unit price Pr(t) are respectively a set of fixed arrays.

5. The enterprise electricity control method according to claim 1, characterized in that: In the step S3-expression of load non-transfer costs, the maximum demand Usy, the demand unit price NPr and the electricity unit price Pr(t) are combined to construct a load non-transfer cost function Fe.

6. The enterprise electricity control method according to claim 5, characterized in that: The load non-transfer cost function Fe is as follows: Among them, Usy is the maximum demand; NPr is the demand unit price; Pr(t) is the electricity price at time t; Wt.La is the power of the transferable load La at time t; Wt.Lb is the power of the non-transferable load Lb at time t.

7. The enterprise electricity control method according to claim 1, characterized in that: In the step S4-representation of the load transfer cost, the cost function Ku is constructed by combining the transfer angle j and the transfer cost value ks, and the time and power information in the load non-transferred cost function Fe is mapped to the polar coordinate system for easy analysis, and then the load transfer cost function Fe′ is determined by combining the polar coordinate mapping and the transfer cost.

8. The enterprise electricity control method according to claim 7, characterized in that: The cost function Ku and the load transfer fee function Fe′ are as follows: in: U new sy is the new maximum power demand after rotation; It represents the cost after the transferable load La is transferred; Represents the cost of the non-transferable load Lb.

9. The enterprise electricity control method according to claim 8, characterized in that: In the step S5-power consumption control, the load transfer cost function Fe' is traversed, and the transfer coefficient j corresponding to the minimum value of the load transfer cost function Fe' is recorded, so as to determine the transfer time Tz, and then use the load control device to control power consumption, where Tz = j minutes.

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