Circuit breaker control system and method

Abstract

The technical field of circuit breaker control of the present invention specifically relates to a circuit breaker control system and method, which collects photovoltaic power generation data and load data, detects the current energy storage capacity of the photovoltaic energy storage power generation system, and calculates the initial control plan of the circuit breaker control system; collects the real-time photovoltaic power generation of the day, adjusts the initial control plan, and realizes the synergy between the photovoltaic energy storage power generation system and the city power system. The current of the entire power system is monitored by the current monitoring module to obtain real-time current data. If there is a short circuit, the line or equipment with the current short circuit is analyzed according to the real-time current data, and the corresponding line or equipment is shut down by the circuit breaker control system; when the system is overloaded, the power size of all working loads is detected in real time, and the designated equipment is shut down. Efficient control of the integrated energy system is achieved, equipment costs are reduced, and control and maintenance difficulties are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker control, and in particular to a circuit breaker control system and method. Background Art

[0002] In simple terms, a circuit breaker is a switching device that can close, carry and disconnect current under normal circuit conditions, and can close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. With the continuous development of circuit breaker technology, the current circuit breaker is not only a switching device, but also a device that can realize power distribution, start asynchronous motors infrequently, and protect power lines and motors. The internal structure can be seen in the attached Figure 1 shown.

[0003] Due to the rapid development of various energy technologies, in many scenarios, it is not just a single energy source that is used for power supply, but two or even multiple energy systems are used to power the equipment. At present, when there are multiple energy systems for power supply, large-scale control equipment is required to achieve comprehensive energy control, which leads to high equipment investment, complex control, and high maintenance difficulty when the control equipment fails.

[0004] The technology of circuit breakers is also constantly developing. Therefore, how to improve the existing circuit breaker control system so that it can control the integrated energy system is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a circuit breaker control system to achieve efficient control of an integrated energy system, reduce equipment costs, and reduce control and maintenance difficulties.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, a circuit breaker control method is provided, comprising the following steps:

[0008] S1: Collect the photovoltaic power generation data and the load data of the whole day on the previous day, detect the current energy storage capacity of the photovoltaic power generation system, and calculate the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day;

[0009] S2: collecting the real-time photovoltaic power generation of the day, adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation, and obtaining an adjusted control scheme;

[0010] S3: Based on the adjusted control scheme, control is performed through the circuit breaker control system to achieve synergy between the photovoltaic energy storage power generation system and the mains power system;

[0011] S4: Monitor the current of the entire power system through the current monitoring module, obtain real-time current data, and determine whether the system has a short circuit based on the real-time current data. If so, analyze the lines or equipment with current short circuits based on the real-time current data, and shut down the corresponding lines or equipment through the circuit breaker control system; determine whether the system has an overload. If so, detect the power size of all working loads in real time, and shut down the designated equipment based on the preset priority; if both are no, continue current monitoring.

[0012] Preferably, the initial control scheme in step S1 includes, based on the photovoltaic power generation power data, load data and current energy storage capacity of the previous day, and excluding the emergency energy storage capacity, calculating the time that the photovoltaic power generation system can provide normal operation of the load, calculating the time when the circuit breaker control system switches from the photovoltaic power generation system to the mains system, and the next time it switches from the mains system to the photovoltaic power generation system.

[0013] Preferably, the calculation formula for the time for the circuit breaker control system to switch from the photovoltaic power generation system to the mains power system is as follows:

[0014] ;

[0015] in, P for tn The power value at the moment, t 0 is the initial moment of photovoltaic power generation energy calculation, tn is the termination time of photovoltaic power generation energy calculation, W r is the current energy storage capacity of the photovoltaic power generation system, W e For emergency energy storage capacity, P L is the total power of all current loads.

[0016] Preferably, the specific process of adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation power in step S2 is as follows:

[0017] According to the comparison between the real-time photovoltaic power generation and the photovoltaic power generation at the same time of the previous day, the time of switching from the photovoltaic power generation system to the mains power system is adjusted in advance or in delay. If the real-time photovoltaic power generation is greater than the photovoltaic power generation at the same time of the previous day, the time of switching from the photovoltaic power generation system to the mains power system is adjusted in delay; if the real-time photovoltaic power generation is lower than the photovoltaic power generation at the same time of the previous day, the time of switching from the photovoltaic power generation system to the mains power system is adjusted in advance. The specific calculation formula for the postponed or advanced time is as follows:

[0018] ;

[0019] Among them, △T is the time of delay or advance of adjustment ，P 1 is the photovoltaic power generation at the current time, P 2 is the photovoltaic power generation at the same time of the previous day, t 0 is the initial moment of photovoltaic power generation energy calculation, tn It is the termination time of photovoltaic power generation energy calculation.

[0020] Preferably, the specific process of step S6 is as follows:

[0021] S61: Detect the power of all working loads in real time, record the importance of each load, and set the shutdown priority according to the importance of each load;

[0022] S62: Calculate the power value exceeding the normal load, and obtain the power value of the load that needs to be shut down;

[0023] S63: shutting down designated devices according to the set shutdown priority based on the power value of the load that needs to be shut down.

[0024] In a second aspect, a circuit breaker control system is provided, comprising a data acquisition module, an energy storage capacity detection module, a calculation module, a current monitoring module, a circuit breaker module, a priority setting module and a main control module; the data acquisition module and the energy storage capacity detection module are connected to the calculation module, the current monitoring module is connected to the circuit breaker module, the priority setting module is connected to the circuit breaker module, and the data acquisition module, the energy storage capacity detection module, the calculation module, the current monitoring module, the circuit breaker module, and the priority setting module are all connected to the main control module;

[0025] The data acquisition module is used to collect power generation data of the photovoltaic power generation system and load data;

[0026] The energy storage capacity detection module is used to detect the energy storage capacity of the photovoltaic power generation system;

[0027] The calculation module is used to calculate the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data of the previous day, the load data and the current energy storage capacity, and the time for adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation;

[0028] The current monitoring module is used to monitor the current in the power load and the circuit in real time;

[0029] The circuit breaker module is used to shut down the line or load in case of overload or short circuit;

[0030] The priority setting module is used to set the shutdown priority according to the importance of each load;

[0031] The main control module is used to control the data acquisition module, the energy storage capacity detection module, the calculation module, the current monitoring module, the circuit breaker module, and the priority setting module.

[0032] Preferably, it also includes an early warning module, which is connected to the main control module. In the event of overload or short circuit, the main control module controls the early warning module to perform early warning processing.

[0033] The beneficial effects of the present invention include:

[0034] The circuit breaker control system and method provided by the present invention detects the current energy storage capacity of the photovoltaic power generation system by collecting photovoltaic power generation power data and load data, and calculates the initial control plan of the circuit breaker control system; collects the real-time photovoltaic power generation power of the day, adjusts the initial control plan, and realizes the synergy between the photovoltaic energy storage power generation system and the mains power system. The current of the entire power system is monitored by the current monitoring module to obtain real-time current data. If there is a short circuit, the line or equipment with the current short circuit is analyzed according to the real-time current data, and the corresponding line or equipment is shut down by the circuit breaker control system; when the system is overloaded, the power size of all working loads is detected in real time, and the designated equipment is shut down.

[0035] The control process of the above-mentioned circuit breaker control system combines the comprehensive energy information of the photovoltaic power generation system and the mains power system, realizes efficient control of the comprehensive energy system, and realizes the organic coordination between the photovoltaic power generation system and the mains power system.

[0036] By setting up a circuit breaker control system, there is no need to configure huge control equipment, which reduces the equipment investment cost, effectively reduces the control difficulty of the control system, and the maintenance difficulty of the entire control system is extremely low. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the internal structure of a circuit breaker in the prior art of the present invention.

[0038] Figure 2 It is a flow chart of the circuit breaker control method of the present invention.

[0039] Figure 3 It is a schematic diagram of the architecture of the circuit breaker control system of the present invention. DETAILED DESCRIPTION

[0040] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with 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 of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0041] The following is combined with Figure 1~Figure 3 The present invention is further described in detail:

[0042] Example 1, see Figure 2 , a circuit breaker control method, comprising the following steps:

[0043] S1: Collect the photovoltaic power generation data and the load data of the whole day on the previous day, detect the current energy storage capacity of the photovoltaic power generation system, and calculate the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day;

[0044] S2: collecting the real-time photovoltaic power generation of the day, adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation, and obtaining an adjusted control scheme;

[0045] S3: Based on the adjusted control scheme, control is performed through the circuit breaker control system to achieve synergy between the photovoltaic energy storage power generation system and the mains power system;

[0046] S4: Monitor the current of the entire power system through the current monitoring module, obtain real-time current data, and determine whether the system has a short circuit based on the real-time current data. If so, analyze the lines or equipment with current short circuits based on the real-time current data, and shut down the corresponding lines or equipment through the circuit breaker control system; determine whether the system has an overload. If so, detect the power size of all working loads in real time, and shut down the designated equipment based on the preset priority; if both are no, continue current monitoring.

[0047] In the existing technology, there are multiple energy systems in many application scenarios. In particular, with the rapid development of photovoltaic power generation technology in recent years, photovoltaic power generation equipment has become increasingly popular, making photovoltaic power generation equipment configured in many electricity usage scenarios. Although photovoltaic power generation equipment has been widely popularized, photovoltaic power generation equipment alone cannot meet the electricity demand in all time periods. Therefore, it is necessary to switch the output of the photovoltaic power generation system to the mains system in a timely manner to provide continuous power supply through the mains system.

[0048] The present invention first collects the photovoltaic power generation data and the load data of the whole day during the day of the previous day, and detects the current energy storage capacity of the photovoltaic power generation system, and calculates the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day. The initial control scheme includes the time when the circuit breaker control system switches the output of the photovoltaic power generation system to the mains system by controlling the circuit breaker. However, due to the different weather every day, the power generation is different every day. Therefore, on the one hand, the initial control scheme is calculated by using the power generation data and energy storage capacity of the previous day to obtain a rough time for the output of the photovoltaic power generation system to switch to the mains system, and then the real-time photovoltaic power generation of the day is collected, and the initial control scheme of the circuit breaker control system is adjusted based on the real-time photovoltaic power generation to obtain the adjusted accurate time for the output of the photovoltaic power generation system to switch to the mains system.

[0049] Based on the adjusted control scheme, the synergy between the photovoltaic energy storage power generation system and the mains power system is achieved through control by the circuit breaker control system. The photovoltaic power generation system and the mains power system can achieve fine synergy and provide continuous energy for the power system. On the other hand, since the time for the output of the photovoltaic power generation system to switch to the mains power system is obtained accurately through the above two rough and fine calculation processes, the purpose is to reduce the number of switching between the photovoltaic power generation system and the mains power system. While ensuring the normal operation of the power system, the fewer the number of switching, the greater the stability of the entire system, and at the same time, it can greatly avoid equipment abnormalities during the switching between the photovoltaic power generation system and the mains power system.

[0050] On the other hand, the current monitoring module monitors the current of the entire power system, obtains real-time current data, and determines whether the system has a short circuit based on the real-time current data. If so, the short-circuited line or equipment is analyzed based on the real-time current data, and the corresponding line or equipment is shut down through the circuit breaker control system; it determines whether the system is overloaded. If so, the power size of all working loads is detected in real time, and the designated equipment is shut down. If there is no overload or short circuit, the current will be continuously monitored to ensure that all power lines are working normally.

[0051] On the basis of Example 1, the initial control scheme in step S1 includes calculating the time during which the photovoltaic power generation system can supply the load with normal operation, the time during which the circuit breaker control system switches from the photovoltaic power generation system to the mains system, and the time during which the circuit breaker control system switches from the mains system to the photovoltaic power generation system next time, based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day, and excluding the emergency energy storage capacity.

[0052] The calculation formula for the time it takes for the circuit breaker control system to switch from the photovoltaic power generation system to the mains power system is as follows:

[0053] ;

[0054] in, P for tn The power value at the moment, t 0 is the initial moment of photovoltaic power generation energy calculation, tn is the termination time of photovoltaic power generation energy calculation, W r is the current energy storage capacity of the photovoltaic power generation system, W e For emergency energy storage capacity, P L is the total power of all current loads.

[0055] The specific process of adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation power in step S2 is as follows: according to the comparison between the real-time photovoltaic power generation power and the photovoltaic power generation power at the same time of the previous day, the time for switching from the photovoltaic power generation system to the mains system is adjusted in advance or postponed. If the real-time photovoltaic power generation power is greater than the photovoltaic power generation power at the same time of the previous day, the time for switching from the photovoltaic power generation system to the mains system is postponed; if the real-time photovoltaic power generation power is lower than the photovoltaic power generation power at the same time of the previous day, the time for switching from the photovoltaic power generation system to the mains system is adjusted in advance.

[0056] The calculation formula for the specific postponement or advance time is as follows:

[0057] ;

[0058] Among them, △T is the time of delay or advance of adjustment ，P 1 is the photovoltaic power generation at the current time, P 2 is the photovoltaic power generation at the same time of the previous day, t 0 is the initial moment of photovoltaic power generation energy calculation, tn It is the termination time of photovoltaic power generation energy calculation.

[0059] The specific process of step S6 is as follows:

[0060] S61: Detect the power of all working loads in real time, record the importance of each load, and set the shutdown priority according to the importance of each load;

[0061] S62: Calculate the power value exceeding the normal load, and obtain the power value of the load that needs to be shut down;

[0062] S63: shutting down designated devices according to the set shutdown priority based on the power value of the load that needs to be shut down.

[0063] The reason why the importance of each load is recorded and the shutdown priority is set according to the importance of each load is that the importance of all load devices is different. Some devices are very important. Even in the case of overload, they cannot be shut down at will, because some devices, such as some important servers, will cause huge losses if they are powered off. Therefore, for such highly important devices, their shutdown priority needs to be set to the lowest. For other non-essential low-importance devices, their shutdown priority is set to high. When the circuit breaker control system performs shutdown processing, such devices can be shut down first. By shutting down some non-essential loads, the load of the entire power system tends to be within the normal range. In reality, in most cases in regional power systems, when overload occurs, it will generally trip directly, and all power loads will be shut down. This processing method is very likely to cause huge losses.

[0064] Therefore, the circuit breaker control system of the present application, on the one hand, realizes the organic coordination between the photovoltaic power generation system and the mains power system, and on the other hand, enables the entire power consumption system to be under the control of the circuit breaker control system. When an overload occurs, only some non-essential loads are shut down, so that loads with high importance are in a state of continuous normal operation, greatly reducing the losses caused by arbitrarily shutting down loads.

[0065] See also Figure 3 A circuit breaker control system comprises a data acquisition module, an energy storage capacity detection module, a calculation module, a current monitoring module, a circuit breaker module, a priority setting module and a main control module; the data acquisition module and the energy storage capacity detection module are connected to the calculation module, the current monitoring module is connected to the circuit breaker module, the priority setting module is connected to the circuit breaker module, and the data acquisition module, the energy storage capacity detection module, the calculation module, the current monitoring module, the circuit breaker module and the priority setting module are all connected to the main control module.

[0066] The data acquisition module is used to collect the power generation data of the photovoltaic power generation system and the load data; the energy storage capacity detection module is used to detect the energy storage capacity of the photovoltaic power generation system; the calculation module is used to calculate the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day, and calculate the time to adjust the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation power; the current monitoring module is used to monitor the power load and the current in the line in real time; the circuit breaker module is used to shut down the line or load in the case of overload or short circuit; the priority setting module is used to set the shutdown priority according to the importance of each load; the main control module is used to control the data acquisition module, the energy storage capacity detection module, the calculation module, the current monitoring module, the circuit breaker module, and the priority setting module. It also includes an early warning module, which is connected to the main control module. In the case of overload or short circuit, the main control module controls the early warning module to perform early warning processing.

[0067] In summary, the circuit breaker control system and method provided by the present invention detects the current energy storage capacity of the photovoltaic power generation system by collecting photovoltaic power generation data and load data, and calculates the initial control plan of the circuit breaker control system; collects the real-time photovoltaic power generation of the day, adjusts the initial control plan, and realizes the synergy between the photovoltaic energy storage power generation system and the city power system. The current of the entire power system is monitored by the current monitoring module to obtain real-time current data. If there is a short circuit, the line or equipment with the current short circuit is analyzed according to the real-time current data, and the corresponding line or equipment is shut down by the circuit breaker control system; when the system is overloaded, the power size of all working loads is detected in real time, and the designated equipment is shut down.

[0068] The control process of the above-mentioned circuit breaker control system combines the comprehensive energy information of the photovoltaic power generation system and the mains power system, realizes efficient control of the comprehensive energy system, and realizes the organic coordination between the photovoltaic power generation system and the mains power system. By setting up a circuit breaker control system, there is no need to configure a large control device, which reduces the equipment investment cost, effectively reduces the control difficulty of the control system, and the maintenance difficulty of the entire control system is extremely low.

[0069] The above-mentioned embodiments only express the specific implementation method of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A circuit breaker control method, characterized in that: The following steps are involved: S1: Collect the photovoltaic power generation data and the load data of the whole day on the previous day, detect the current energy storage capacity of the photovoltaic power generation system, and calculate the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day; S2: collecting the real-time photovoltaic power generation of the day, adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation, and obtaining an adjusted control scheme; S3: Based on the adjusted control scheme, control is performed through the circuit breaker control system to achieve synergy between the photovoltaic energy storage power generation system and the mains power system; S4: Monitor the current of the entire power system through the current monitoring module, obtain real-time current data, and determine whether the system has a short circuit based on the real-time current data. If so, analyze the line or equipment with the current short circuit according to the real-time current data, and shut down the corresponding line or equipment through the circuit breaker control system; determine whether the system has an overload. If so, detect the power size of all working loads in real time, and shut down the specified equipment based on the preset priority; If all are no, continue current monitoring; The initial control scheme in step S1 includes, based on the photovoltaic power generation data, load data and current energy storage capacity of the previous day, and excluding the emergency energy storage capacity, calculating the time when the photovoltaic power generation system can provide normal operation for the load, calculating the time when the circuit breaker control system switches from the photovoltaic power generation system to the mains system, and the time when the next switch from the mains system to the photovoltaic power generation system is made; The calculation formula for the time it takes for the circuit breaker control system to switch from the photovoltaic power generation system to the mains power system is as follows: ； Among them, P tn for The power value at the moment, is the initial moment of photovoltaic power generation energy calculation, is the termination time of photovoltaic power generation energy calculation, W r is the current energy storage capacity of the photovoltaic power generation system, W e is the emergency energy storage capacity, P L is the total power of all current loads; The specific process of adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation power in step S2 is as follows: According to the comparison between the real-time photovoltaic power generation and the photovoltaic power generation at the same time of the previous day, the time of switching from the photovoltaic power generation system to the mains power system is adjusted in advance or in delay. If the real-time photovoltaic power generation is greater than the photovoltaic power generation at the same time of the previous day, the time of switching from the photovoltaic power generation system to the mains power system is adjusted in delay; if the real-time photovoltaic power generation is lower than the photovoltaic power generation at the same time of the previous day, the time of switching from the photovoltaic power generation system to the mains power system is adjusted in advance. The specific calculation formula for the postponed or advanced time is as follows: ； Among them, △T is the time of delay or advance of adjustment ，P 1 tn is the photovoltaic power generation at the current time, P 2 tn is the photovoltaic power generation at the same time of the previous day, t 0 is the initial moment of photovoltaic power generation energy calculation, tn It is the termination time of photovoltaic power generation energy calculation.

2. A circuit breaker control method according to claim 1, characterized in that: The specific process of step S6 is as follows: S61: Detect the power of all working loads in real time, record the importance of each load, and set the shutdown priority according to the importance of each load; S62: Calculate the power value exceeding the normal load, and obtain the power value of the load that needs to be shut down; S63: shutting down designated devices according to the set shutdown priority based on the power value of the load that needs to be shut down.

3. A circuit breaker control system, using a circuit breaker control method according to claim 1, characterized in that: It includes a data acquisition module, an energy storage capacity detection module, a calculation module, a current monitoring module, a circuit breaker module, a priority setting module and a main control module; the data acquisition module and the energy storage capacity detection module are connected to the calculation module, the current monitoring module is connected to the circuit breaker module, the priority setting module is connected to the circuit breaker module, and the data acquisition module, the energy storage capacity detection module, the calculation module, the current monitoring module, the circuit breaker module, and the priority setting module are all connected to the main control module; The data acquisition module is used to collect power generation data of the photovoltaic power generation system and load data; The energy storage capacity detection module is used to detect the energy storage capacity of the photovoltaic power generation system; The calculation module is used to calculate the initial control scheme of the circuit breaker control system based on the photovoltaic power generation data of the previous day, the load data and the current energy storage capacity, and the time for adjusting the initial control scheme of the circuit breaker control system based on the real-time photovoltaic power generation; The current monitoring module is used to monitor the current in the power load and the circuit in real time; The circuit breaker module is used to shut down the line or load in case of overload or short circuit; The priority setting module is used to set the shutdown priority according to the importance of each load; The main control module is used to control the data acquisition module, the energy storage capacity detection module, the calculation module, the current monitoring module, the circuit breaker module, and the priority setting module.

4. A circuit breaker control system according to claim 3, characterized in that: It also includes an early warning module, which is connected to the main control module. In the event of overload or short circuit, the main control module controls the early warning module to perform early warning processing.

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