Cement plant multi-power-supply electric quantity balance control system

Abstract

The utility model discloses a cement plant multi-power-supply electric quantity balance control system, which relates to the technical field of power distribution network, and comprises a transformer, a wire inlet cabinet, a waste heat power generation device and a photovoltaic power generation device, the low-voltage end of the transformer is connected with the wire inlet cabinet, the waste heat power generation device is connected to the wire inlet cabinet through a grid-connected cabinet I, and the photovoltaic power generation device is connected to the wire inlet cabinet through a grid-connected cabinet II. The photovoltaic power generation equipment is connected to the wire inlet cabinet through the second grid-connected cabinet, and the wire inlet cabinet is further connected with the energy storage system through the third grid-connected cabinet. According to the utility model, the energy storage system is reasonably configured, so that light abandoning is reduced, the energy storage system can be used as an electrical load, charging is carried out when the generating capacity cannot be consumed, and redundant generating capacity is consumed; the power consumption and the power generation amount are balanced as much as possible, the utilization rate of photovoltaic power generation amount in the cement factory is effectively improved, the production power consumption cost is reduced, in addition, the photovoltaic installed capacity can be improved by reasonably configuring the energy storage system, and therefore the production power consumption cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution network, in particular to a multi-power supply electric quantity balance control system for a cement plant. Background Art

[0002] At present, domestic cement factories basically implement time-of-use electricity prices. In order to reduce electricity costs, they try to use valley electricity for production as much as possible. Therefore, the electricity load will basically fluctuate with the peak and valley electricity periods, and some fluctuations are relatively large. As a large energy consumer, cement companies build photovoltaic power generation in the factory under multiple factors such as "dual carbon" and "power restrictions". Generally, they adopt the "self-generation and self-use" mode to connect to the factory's internal power supply and distribution network, and the photovoltaic power generation power varies with the light intensity; in addition, cement factories generally have waste heat power generation.

[0003] At different time periods, especially during the daytime photovoltaic power generation period, the power load and power generation fluctuate greatly. At peak times, the power generation may exceed the power load, that is, the power generation cannot be fully absorbed. At this time, "abandonment of light" will occur, resulting in energy waste. Therefore, a multi-power supply balance control system for cement plants is needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-power supply balance control system for a cement plant to solve the problems existing in the prior art proposed in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A multi-power supply electricity balance control system for a cement plant comprises a transformer, an incoming line cabinet, a waste heat power generation device and a photovoltaic power generation device. The low-voltage end of the transformer is connected to the incoming line cabinet. The waste heat power generation device is connected to the incoming line cabinet through a grid-connected cabinet 1. The photovoltaic power generation device is connected to the incoming line cabinet through a grid-connected cabinet 2. The incoming line cabinet is also connected to an energy storage system through a grid-connected cabinet 3.

[0007] Preferably, a voltage transformer cabinet is connected to the incoming line cabinet.

[0008] Preferably, the incoming line cabinet is also connected to an outgoing line cabinet for connecting electrical equipment.

[0009] Preferably, the high voltage end of the transformer is connected to a 110KV power grid.

[0010] Preferably, the energy storage system is monitored and controlled by an EMS energy management system.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model reduces "wasted light" by reasonably configuring the energy storage system. The energy storage system can act as an electricity load and charge when the power generation cannot be consumed, consuming excess power, and achieving a balance between power usage and power generation as much as possible, effectively improving the utilization rate of photovoltaic power generation in the cement plant and reducing production electricity costs. In addition, by reasonably configuring the energy storage system, the photovoltaic installed capacity can be increased, thereby further reducing production electricity costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit connection diagram of the control system of the utility model. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0015] See also Figure 1 , the utility model provides the following technical solutions:

[0016] A multi-power supply electricity balance control system for a cement plant comprises a transformer, an incoming line cabinet, a waste heat power generation device and a photovoltaic power generation device. The low-voltage end of the transformer is connected to the incoming line cabinet. The waste heat power generation device is connected to the incoming line cabinet through a grid-connected cabinet 1. The photovoltaic power generation device is connected to the incoming line cabinet through a grid-connected cabinet 2. The incoming line cabinet is also connected to an energy storage system through a grid-connected cabinet 3. The energy storage system is monitored and controlled by an EMS energy management system.

[0017] The incoming line cabinet is connected to a voltage transformer cabinet; the incoming line cabinet is also connected to an outgoing line cabinet for connecting electrical equipment; the high voltage end of the transformer is connected to a 110KV power grid.

[0018] The working process of the utility model is as follows:

[0019] Under normal operation of the cement plant, during the night period, the active power PW2 of the first grid cabinet of the waste heat power generation equipment is negative (power generation), the active power PW3 of the second grid cabinet of the photovoltaic power generation equipment is 0 (no power generation), and the active power PW1 of the 10kV incoming cabinet at the low-voltage end of the transformer is equal to the power load - PW2, and the power is greater than 0, that is, the factory absorbs power from the power grid; during the daytime period, the active power PW2 of the first grid cabinet of the waste heat power generation equipment is negative (power generation), the active power PW3 of the second grid cabinet of the photovoltaic power generation equipment is negative (power generation), and the active power PW1 of the 10kV incoming cabinet at the low-voltage end of the transformer is equal to the power load - PW2 plus - PW3, and the power is greater than 0, that is, the factory absorbs power from the power grid; under normal circumstances, the photovoltaic power generation can be consumed in the factory.

[0020] When the power load of the cement plant is low (some workshop equipment is shut down), during the daytime, the sum of the active power PW2 of the waste heat power generation equipment grid cabinet one and the active power PW3 of the photovoltaic power generation equipment grid cabinet two is greater than the power load. If the total step-down station has no reverse power protection, the active power PW1 at the 10kV incoming line cabinet is negative, that is, the factory outputs power to the grid. In order to absorb the photovoltaic surplus power, the energy storage system EMS energy management system monitors the load of the 10kV cabinet at the low-voltage end of the transformer, controls the charging of the energy storage system, and balances the power consumption and power generation, that is, PW1 = power load + PW4-PW2-PW3=0. In addition, during the peak power load period, the energy storage system can discharge to reduce the power absorbed by the factory from the grid, and balance the power consumption and power generation, that is, PW1 = power load-PW4-PW2-PW3=0.

[0021] The power of the energy storage system should not be less than the difference between the maximum power generation power and the minimum power load, that is, the maximum value of PW2+PW3-power load data; the capacity of the energy storage system should not be less than the maximum value of excess electricity that cannot be absorbed by theoretical power generation.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-power supply balance control system for a cement plant, comprising a transformer, an incoming line cabinet, a waste heat power generation device and a photovoltaic power generation device, wherein the low-voltage end of the transformer is connected to the incoming line cabinet, the waste heat power generation device is connected to the incoming line cabinet through a grid-connected cabinet 1, and the photovoltaic power generation device is connected to the incoming line cabinet through a grid-connected cabinet 2, characterized in that: The incoming line cabinet is also connected to an energy storage system through a grid-connected cabinet.

2. A cement plant multi-power supply balance control system according to claim 1, characterized in that: The incoming line cabinet is connected to a voltage transformer cabinet.

3. A cement plant multi-power supply balance control system according to claim 1, characterized in that: The incoming line cabinet is also connected to an outgoing line cabinet for connecting electrical equipment.

4. A cement plant multi-power supply balance control system according to claim 1, characterized in that: The high voltage end of the transformer is connected to the 110KV power grid.

5. A cement plant multi-power supply balance control system according to claim 2, characterized in that: The energy storage system is monitored and controlled by an EMS energy management system.

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