A kind of automatic voltage control system and method of power system

Abstract

The present application relates to an automatic voltage control system and method for an electric power system, wherein the automatic voltage control system comprises a central control unit for installation between a small power supply device, a large main power supply device, an emergency power supply device and a load device distribution board, wherein the load device distribution board is connected to each load device. The present application has the effect of facilitating automatic voltage switching and having the advantages of energy saving and power saving.

Description

Technical Field

[0001] The present application relates to the field of power system control, and in particular to an automatic voltage control system and method for a power system. Background Art

[0002] A voltage control device is a control device that adjusts the voltage so that it can be stably transmitted to loads such as electronic equipment, precision instruments, and precision equipment. Under normal circumstances, when the load needs power supply, there are several power supply methods: the first one: power supply through self-generating equipment, the second one: power supply through the power company, and the third one: power supply through an emergency power supply that has been charged in advance. The specific power supply method needs to be switched manually.

[0003] Regarding the above-mentioned related technologies, the inventor believes that when one of the power supply devices has a problem, it cannot automatically switch, thereby failing to ensure stable voltage output; and when the self-generating device can supply power, it does not have a power supply switching function, thereby failing to meet the requirements of energy saving and power saving. Summary of the invention

[0004] In order to facilitate automatic voltage switching and have the advantages of energy saving and power saving, the present application provides an automatic voltage control system and method for an electric power system.

[0005] The present application provides an automatic voltage control system for a power system using the following technical solutions:

[0006] An automatic voltage control system for an electric power system, comprising a central control unit for installation between a small power supply device, a large main power supply device, an emergency power supply device and a load device distribution board, wherein the load device distribution board is connected to each load device;

[0007] The central control unit includes a central controller, on which are arranged a small power supply line, a large power supply line, an emergency power supply line and a power supply line. The small power supply line is used to connect a small power supply device with the central controller, the large power supply line is used to connect a large total power supply device with the central controller, the emergency power supply line is used to connect an emergency power supply device with the central controller, and the power supply line is used to connect a load device with the central controller;

[0008] Electricity and voltage testing devices are installed on small power incoming lines, large power incoming lines, emergency power incoming lines and power supply lines. The electricity and voltage testing devices are respectively small power incoming electricity and voltage testing devices, large power incoming electricity and voltage testing devices, emergency power incoming electricity and voltage testing devices and power supply electricity and voltage testing devices. The small power incoming electricity and voltage testing devices measure the electricity of small power supply equipment, the large power incoming electricity and voltage testing devices measure the electricity of large total power supply equipment, the emergency power incoming electricity and voltage testing devices measure the electricity of emergency power supply equipment, and the power supply electricity and voltage testing devices measure the preset voltage of the load equipment;

[0009] The central control unit is used to store the pre-set input voltage and required power of each load device, detect the output voltage and power of small power supply equipment, large main power supply equipment, and emergency power supply equipment, control the on and off circuits between small power supply equipment, large main power supply equipment and load equipment distribution boards, and change the output voltage of small power supply equipment, large main power supply equipment, and emergency power supply equipment.

[0010] By adopting the above technical solution, the power supply equipment is adjusted to provide effective and sufficient power supply to the load equipment by measuring the power supply and voltage on small power supply lines, large power supply lines, emergency power supply lines and power supply lines through a power supply and voltage testing device.

[0011] Optionally: the central controller is provided with a memory connected via a temporary power supply line.

[0012] By adopting the above technical solution, the memory stores the power passing through the central controller through the temporary power line for use in the internal power starter.

[0013] The present application also provides a method for automatic voltage control of a power system using the following technical solution:

[0014] An automatic voltage control method for an electric power system comprises the following steps:

[0015] A. When the power of the small power supply device is greater than the preset power of the load device, the central control unit adjusts the output voltage of the small power supply device according to the detection results of the input voltage and output voltage of the small power supply device, and transmits it to the load device at the preset voltage;

[0016] B. When the power of the small power supply equipment is lower than the preset power of the load equipment, the power supply is switched to the large main power supply equipment. According to the detection results of the input voltage and output voltage of the large main power supply equipment, the central control unit adjusts the output voltage of the large main power supply equipment and transmits it to the load equipment at the preset voltage.

[0017] By adopting the above technical solution, it is convenient to automatically switch the power supply scenario when the power supply of the small power supply equipment is insufficient, so that the small power supply equipment and the large main power supply equipment can effectively cooperate in power supply.

[0018] Optionally, the following steps are also included:

[0019] C. When the power of small power supply equipment and large total power supply equipment is lower than the preset power of load equipment, the emergency power supply equipment is switched to supply power; according to the detection results of the input voltage and output voltage of the emergency power supply equipment, the central control unit adjusts the voltage of the emergency power supply equipment and transmits it to the load equipment with the preset voltage.

[0020] By adopting the above technical solution, the power of the self-generating equipment is detected by the power detection device, and the detected power is compared with the pre-set power. If the detected power is more than xKw% of the load equipment power, the power of the self-generating equipment is used.

[0021] Optionally, the preset voltage of the load device in step A is less than the rated voltage of the load device;

[0022] The preset voltage of the load device in step B is less than the rated voltage of the load device;

[0023] The preset voltage of the load device described in step C is less than the rated voltage of the load device.

[0024] Optionally, when a small power supply device is used to supply power, the central control unit controls the small power supply device to be connected to the large main power supply device, and the remaining power of the small power supply device is sold to the power company.

[0025] Optionally, when emergency power supply equipment is used and the power generation time needs to be extended, the output voltage of the emergency power supply equipment is set lower than the rated voltage of the user load equipment.

[0026] Optionally, when the control system is abnormal or the power or voltage of the small power supply equipment is abnormal, the power supply is switched to the large main power supply equipment.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] According to the actual situation, one of self-generated electricity, power company electricity and emergency power is selected to ensure stable power output; and the output voltage of self-generated electricity is set to the minimum value within its appropriate range, so that the use of self-generated electricity can be reduced, and conversely, the surplus power of self-generated electricity can be increased, so that the surplus power can be sold to the power company, thereby increasing the power sales; if the power company's electricity is used, the use of electricity can also be reduced; when emergency electricity is used, the power generation time can also be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the automatic voltage control system of the power system in this embodiment;

[0030] Figure 2 Schematic diagram of the automatic voltage control method for a power system in this embodiment.

[0031] Explanation of the accompanying drawings: 1. Small power supply equipment; 2. Large main power supply equipment; 3. Emergency power supply equipment; 4. Load equipment; 5. Central control unit; 51. Central controller; 52. Memory; 53. Small incoming power voltage testing device; 54. Large incoming power voltage testing device; 55. Emergency incoming power voltage testing device; 56. Power supply power voltage testing device. DETAILED DESCRIPTION

[0032] The following is combined with the accompanying drawings Figure 1-Figure 2 This application is described in further detail.

[0033] The embodiment of the present application discloses an automatic voltage control system for an electric power system, which comprises a central control unit 5 for installation between a small power supply device 1, a large main power supply device 2, an emergency power supply device 3 and a load device 4 distribution board.

[0034] The central control unit 5 is used to store the pre-set input voltage and required power of each load device 4, detect the output voltage and power of the small power supply equipment 1, the large main power supply equipment 2, and the emergency power supply equipment 3, control the on and off circuits between the small power supply equipment 1, the large main power supply equipment 2, the emergency power supply equipment 3 and the load equipment 4 distribution board, and change the output voltage of the small power supply equipment 1, the large main power supply equipment 2, and the emergency power supply equipment 3.

[0035] The central control unit 5 mainly includes a central controller 51 and a memory 52. ​​The memory 52 and the central controller 51 are connected via a temporary power line. The central controller 51 is mainly a relay. The power supply equipment of the central controller 51 is adjusted by setting the parameters of the central controller 51.

[0036] Specifically, the central controller 51 is provided with a small power incoming line, a large power incoming line, an emergency power incoming line and a power supply line. The small power incoming line is used to connect the small power supply equipment 1 with the central controller 51, the large power incoming line is used to connect the large main power supply equipment 2 with the central controller 51, the emergency power incoming line is used to connect the emergency power supply equipment 3 with the central controller 51, and the power supply line is used to connect the load equipment 4 with the central controller 51.

[0037] Electricity and voltage testing devices are installed on the small power-incoming lines, large power-incoming lines, emergency power-incoming lines and power supply lines. The electricity and voltage testing devices are respectively a small power-incoming electricity and voltage testing device 53, a large power-incoming electricity and voltage testing device 54, an emergency power-incoming electricity and voltage testing device 55 and a power supply electricity and voltage testing device 56. The small power-incoming electricity and voltage testing device 53 measures the electricity of the small power supply equipment 1, the large power-incoming electricity and voltage testing device 54 measures the electricity of the large total power supply equipment 2, the emergency power-incoming electricity and voltage testing device 55 measures the electricity of the emergency power supply equipment 3, and the power supply electricity and voltage testing device 56 measures the preset voltage of the load equipment 4. Among them, the power supply electricity and voltage testing device 56 is connected to the small power-incoming electricity and voltage testing device 53, the large power-incoming electricity and voltage testing device 54 and the emergency power-incoming electricity and voltage testing device 55 through the central controller 51, so that the preset voltage of the load equipment 4 is compared with the output voltage of the small power supply equipment 1, the large total power supply equipment 2 and the emergency power supply equipment 3.

[0038] When making adjustments, the following steps are included:

[0039] A. When the power of the small power supply device 1 is greater than the preset power of the load device 4, the central control unit 5 adjusts the voltage of the small power supply device 1 according to the detection results of the input voltage and output voltage of the small power supply device 1, and transmits it to the load device 4 at the preset voltage.

[0040] B. When the power of the small power supply device 1 is lower than the preset power of the load device 4, the power is switched to the power of the large main power supply device 2. According to the detection results of the input voltage and output voltage of the large main power supply device 2, the central control unit 5 adjusts the voltage of the large main power supply device 2 and transmits it to the load device 4 at the preset voltage.

[0041] C. When the power of the small power supply equipment 1 and the large total power supply equipment 2 is lower than the preset power of the load equipment 4, the power is switched to the emergency power supply equipment 3; according to the detection results of the input voltage and output voltage of the emergency power supply equipment 3, the central control unit 5 adjusts the voltage of the emergency power supply equipment 3 and transmits it to the load equipment 4 at a preset voltage.

[0042] In this embodiment, the small power supply device 1, the large main power supply device 2, and the emergency power supply device 3 can be AC ​​power, DC power, or a storage battery, a photovoltaic power generation device, etc. The power voltage test device used in the central control unit 5 can be a voltage meter or a voltage measurement sensor, etc., and the power meter can be a power meter or a power measurement sensor, etc. Among them, the emergency power supply device 3 is detachably connected with the small power supply device 1 and the large main power supply device 2 through wires, so that the small power supply device 1 and the large main power supply device 2 can charge the emergency power supply device 3 to keep the emergency power supply device 3 fully charged.

[0043] When presetting various output voltages, you can set them according to the situation, such as: when using self-generating equipment to supply power, the output voltage can be set to XV; when using large-scale main power supply equipment 2 to supply power, the output voltage can be set to YV; when using emergency power, the output voltage can be set to ZV. By setting the output voltages one by one and adjusting them, a more energy-saving effect can be achieved. Set the output voltage of self-generated power to the lowest value, and give priority to self-generated power.

[0044] During operation, first confirm the preset self-generated voltage. When the power of the small power supply device 1 is greater than the preset power of the load device 4, use the small power supply device 1 to drive the load to work; when the power of the small power supply device 1 is insufficient, switch to the large main power supply device 2 for power supply, and use the large main power supply device 2 to drive the load device 4 to work; if the self-generated equipment or the power company is out of power or has insufficient power, switch to emergency equipment for power supply, and use the emergency power supply device 3 to drive the preset load to work.

[0045] The system in this embodiment can realize that one device can handle multiple input voltages and can set the output voltage one by one.

[0046] In this embodiment, the preset voltage of the load device 4 described in step A is less than the rated voltage of the load device 4; the preset voltage of the load device 4 described in step B is less than the rated voltage of the load device 4;

[0047] The preset voltage of the load device 4 in step C is lower than the rated voltage of the load device 4 .

[0048] When the system is installed in a power generation device dedicated to power sales, the amount of power sold can be increased. For example, if the input voltage is 205V, the output voltage is 205V*A, which is the amount of power sold. After using the intelligent voltage control device, the input voltage is 205V, and the output voltage of the power generation device is set to 2V. At this time, the output power can be increased by at least 6%. If the current value is taken into account, the output power can be increased by 10%.

[0049] At the same time, the system can select one of the self-generated electricity, power company electricity, and emergency power according to actual conditions to prevent the risk of power outages and ensure stable power output.

[0050] In this embodiment, when the small power supply device 1 is used for power supply, the central control unit 5 controls the small power supply device 1 to be connected with the large main power supply device 2, and the remaining power of the small power supply device 1 is sold to the power company;

[0051] When the emergency power supply device 3 is used and the power generation time needs to be extended, the output voltage of the emergency power supply device 3 is set lower than the rated voltage of the user load device 4 .

[0052] The central control unit 5 detects the power of the small power supply device 1 and compares the detected power with the preset power. If the detected power is greater than xKw% of the preset power of the load device 4, the power of the small power supply device 1 is used for power supply.

[0053] When the power of load device 4 (WP) ≦ self-generated power (P), the condition is met and self-generated power is used; note that the power of load device 4 W here refers to the power of the currently working device, and does not include the non-working load device 4. Here, XKW, X, just represents a value, any value is OK, as long as the self-generated power exceeds the power of load device 4, self-generated power is used.

[0054] When the small power supply device 1 has surplus power, the surplus power can be sold to the power company to reduce power waste, and the voltage during the sale can be increased to increase the power sales amount.

[0055] When the self-generated electricity and the power supply company's electricity are insufficient, the emergency power supply is started, and when setting, the output voltage of the emergency power supply equipment 3 is set lower than the rated voltage xV% of the user's load equipment 4. This setting can ensure that the load equipment 4 is in stable use while its use time is extended; when it is detected that the power of the small power supply equipment 1 or the power of the power company is more than xKw% of the preset power of the load equipment 4, the emergency equipment power supply is stopped, and the self-generated electricity equipment or the power company equipment is enabled to generate electricity. This setting can ensure the stable operation of the load equipment 4.

[0056] In this embodiment, when the central control unit 5 is abnormal or the power or voltage of the small power supply equipment 1 is abnormal, the bypass circuit of the large main power supply equipment 2 is switched to supply power; the central control unit 5 is abnormal, for example: the transformer equipment is abnormal, the voltage detection device is abnormal, etc.

[0057] The above configuration ensures that even when the central control unit 5 or the small power supply device 1 is damaged or encounters other abnormal conditions, the large main power supply device 2 can still be switched to perform power supply operations, thereby ensuring stable operation of the load device 4.

[0058] When this system is in use, the complete process is as follows:

[0059] A1: Start the device, select the most suitable power output through the central control unit 5, and then enter process A2;

[0060] A2: Determine whether the small power supply device 1 has power, thereby switching the first switch;

[0061] When the small power supply device 1 has power, the small power supply device 1 is used to supply power, and the power is transmitted to the load device 4 through voltage transformation, and the process A4 is entered, and the remaining power is sold to the power company;

[0062] When the small power supply device 1 has no power, it uses the power company's equipment to supply power, and transmits the power to the load device 4 through voltage transformation, entering process B2.

[0063] A3: If the small power supply device 1 has no power, return to process A2; if the small power supply device 1 has power, enter process A4; if both the small power supply device 1 and the large main power supply device 2 have no power, enter process C1.

[0064] A4: If the small power supply device 1 has electricity, the voltage is transformed through the central control unit 5 and transmitted to the load device 4 at the set voltage. If there is surplus power from the self-generated electricity, the electricity is sold; if the small power supply device 1 has no electricity, enter process B2.

[0065] A5: The central control unit 5 does not detect the input voltage of the small power supply device 1, and enters process B2; the central control unit 5 detects the input voltage of the small power supply device 1, then the central control unit 5 realizes voltage transformation and transmits it to the load device 4 at the set voltage. If there is surplus power from the self-generated electricity, the electricity is sold.

[0066] B1: When the central control unit 5 detects that the large main power supply device 2 has power, it enters process B2; when the central control unit 5 detects that the large main power supply device 2 has no power and the small power supply device 1 has no power, it enters process C1.

[0067] B2: Power is supplied by the large main power supply equipment 2, which transforms the voltage through the central control unit 5 and transmits the voltage to the load equipment 4 at the set voltage, entering process B3.

[0068] B3: When an abnormality occurs in the central control unit 5, enter process B4; when no abnormality occurs in the central control unit 5 and it works normally, enter process B5.

[0069] B4: The output voltage of the large main power supply device 2 is directly transmitted to the load device 4 without passing through the transformer 12 in the central control unit 5 until the load device 4 is used up, and the circuit breaker at the output end of the large main power supply device 2 is disconnected to end the process.

[0070] B5: Powered by the large main power supply equipment 2, the output voltage of the large main power supply equipment 2 is transformed by the central control unit 5 and transmitted to the load equipment 4 at the set voltage until the load equipment 4 is used up, the circuit breaker at the output end of the large main power supply equipment 2 is disconnected, and the process ends.

[0071] C1: The emergency power supply device 3 is turned on, the output voltage is transformed by the central control unit 5, and is transmitted to the load device 4 at the set voltage, entering process C2.

[0072] C2: The central control unit 5 detects that the small power supply device 1 or the large main power supply device 2 has restored power and enters process A2; the central control unit 5 detects that the small power supply device 1 or the large main power supply device 2 has not restored power, and still uses the emergency power supply device 3 to supply power until the load equipment 4 is used up, disconnects the circuit breaker at the output end of the emergency power supply device 3, and ends the process.

[0073] The above system can select one of self-generated power, power company power, and emergency power according to actual conditions to ensure stable power output. When controlling, the input voltage of this system gives priority to self-generated power, followed by power company power, emergency power, etc. At the same time, by setting the output voltage of self-generated power, power company power, and emergency power, and maintaining each power at the most appropriate output voltage, the power consumption of the power company is reduced by giving priority to the consumption of self-generated power.

[0074] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic voltage control method for an electric power system of an automatic voltage control system, characterized in that: It comprises a central control unit (5) for installation between a small power supply device (1), a large main power supply device (2), an emergency power supply device (3) and a distribution board of a load device (4), wherein the distribution board of the load device (4) is connected to each load device (4); The central control unit (5) comprises a central controller (51), and the central controller (51) is provided with a small power supply line, a large power supply line, an emergency power supply line and a power supply line, wherein the small power supply line is used to connect a small power supply device (1) with the central controller (51), the large power supply line is used to connect a large main power supply device (2) with the central controller (51), the emergency power supply line is used to connect an emergency power supply device (3) with the central controller (51), and the power supply line is used to connect a load device (4) with the central controller (51); Electricity and voltage testing devices are installed on the small power supply line, the large power supply line, the emergency power supply line and the power supply line. The electric quantity and voltage testing devices are respectively a small power supply electric quantity and voltage testing device (53), a large power supply electric quantity and voltage testing device (54), an emergency power supply electric quantity and voltage testing device (55) and a power supply electric quantity and voltage testing device (56). The small power supply electric quantity and voltage testing device (53) measures the electric quantity of the small power supply equipment (1), the large power supply electric quantity and voltage testing device (54) measures the electric quantity of the large total power supply equipment (2), the emergency power supply electric quantity and voltage testing device (55) measures the electric quantity of the emergency power supply equipment (3), and the power supply electric quantity and voltage testing device (56) measures the preset voltage of the load equipment (4); The central control unit (5) is used to store the preset input voltage and required power of each load device (4), detect the output voltage and power of the small power supply device (1), the large main power supply device (2), and the emergency power supply device (3), control the on and off circuits between the small power supply device (1), the large main power supply device (2) and the load device (4) distribution board, and change the output voltage of the small power supply device (1), the large main power supply device (2), and the emergency power supply device (3); the central controller (51) is provided with a memory (52) connected via a temporary power supply line; The following steps are involved: A. When the power of the small power supply device (1) is greater than the preset power of the load device (4), the central control unit (5) adjusts the output voltage of the small power supply device (1) according to the detection results of the input voltage and output voltage of the small power supply device (1) and transmits it to the load device (4) at the preset voltage; B. When the power of the small power supply device (1) is lower than the preset power of the load device (4), the power supply is switched to the large main power supply device (2). According to the detection results of the input voltage and output voltage of the large main power supply device (2), the central control unit (5) adjusts the output voltage of the large main power supply device (2) and transmits it to the load device (4) at the preset voltage; C. When the power of the small power supply device (1) and the large main power supply device (2) is lower than the preset power of the load device (4), the emergency power supply device (3) is switched to supply power; based on the detection results of the input voltage and output voltage of the emergency power supply device (3), the central control unit (5) adjusts the voltage of the emergency power supply device (3) and transmits it to the load device (4) at the preset voltage.

2. The automatic voltage control method for an electric power system according to claim 1, characterized in that: The preset voltage of the load device (4) described in step A is less than the rated voltage of the load device (4); The preset voltage of the load device (4) in step B is less than the rated voltage of the load device (4); The preset voltage of the load device (4) in step C is lower than the rated voltage of the load device (4).

3. The automatic voltage control method of the power system according to claim 1, characterized in that: When the small power supply device (1) is used to supply power, the central control unit (5) controls the small power supply device (1) to be connected to the large main power supply device (2), and the remaining power of the small power supply device (1) is sold to the power company.

4. The automatic voltage control method for an electric power system according to claim 1, characterized in that: When the emergency power supply device (3) is used and the power generation time needs to be extended, the output voltage of the emergency power supply device (3) is set lower than the rated voltage of the user load device (4).

5. The automatic voltage control method for an electric power system according to claim 1, characterized in that: When the control system is abnormal or the power or voltage of the small power supply device (1) is abnormal, the power supply is switched to the large main power supply device (2).

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