[0034] Example:
[0035] A coordinating device for the power supply system of two low-voltage stations, the two low-voltage stations are divided into a first low-voltage station 4 and a second low-voltage station 5, the first low-voltage station 4 includes a 400V first AC bus 4-1, a 10kWp second A distributed photovoltaic 4-2 and a first conventional load 4-3, the second low-voltage platform area 5 includes a 400V second AC bus 5-1, a 10kWp second distributed photovoltaic 5-2 and a second conventional load 5-3, The conventional load is specifically an AC charging pile; the coordinating device of the power supply system of the two low-voltage stations includes a main control module 1, a data acquisition module 2 and a power support module 3, and the main control module 1 includes a coordination controller 1-2 and The monitoring background 1-1, the coordinating controller 1-2 and the monitoring background 1-1 are connected through optical fiber communication, and the monitoring background 1-1 is used to receive and organize the power distribution data collected by the data acquisition module 2, and is used by the coordinating controller 1-2 To issue a control command to the power support module 3; the data acquisition module 2 is connected to the main control module 1 in communication, and the data acquisition module 2 is used to collect power distribution data and transmit the power distribution data to the main control module 1 for processing and Save; the power support module 3 is connected to the main control module 1 and used to provide support power after receiving a control command from the main control module 1 .
[0036] The power support module 3 includes a 150kW DC/AC flexible DC converter A1, a 150kW DC/AC flexible DC converter A2, a 150kW energy storage system 3-1 and a DC load 3-2, and the DC load is specifically a DC charging pile; the AC terminals of the DC/AC flexible DC converter A1 and the DC/AC flexible DC converter A2 are respectively connected to the first AC bus 4-1 and the second AC bus 5-1, and the DC The DC terminal of the /AC flexible DC converter A1 and the DC terminal of the DC/AC flexible DC converter A2 are connected to each other to construct a power transmission device 3-3; the energy storage system 3-1 includes a DC/DC converter 3- 1-1 and an energy storage battery 3-1-2, wherein the energy storage battery 3-1-2 is connected to a power transmission device 3-3 through a DC/DC converter 3-1-1; the DC load 3-2 Connected to the power transmission device 3-3.
[0037] The data acquisition module 2 includes several TTU distribution transformer monitoring terminals 6 and several carrier meters 7, and the first TTU power distribution for collecting transformer low-voltage side power distribution data is connected between the first AC bus 4-1 and the transformer. The transformer monitoring terminal 6-1 is connected between the first AC bus 4-1 and the power support module 3. The second TTU distribution transformer monitoring terminal 6- for collecting the AC terminal power distribution data of the DC/AC flexible DC converter A1 2. The third TTU distribution transformer monitoring terminal 6-3 is connected between the second AC bus 5-1 and the transformer for collecting power distribution data on the low-voltage side of the transformer, and between the second AC bus 5-1 and the power support module 3 Connected with the fourth TTU distribution transformer monitoring terminal 6-4 for collecting the AC terminal power distribution data of the DC/AC flexible DC converter A2, the energy storage battery 3-1-2 and the DC/DC converter 3-1-1 The fifth TTU distribution transformer monitoring terminal 6-5 for collecting the output distribution data of the energy storage battery 3-1-2 is connected between them; between the first AC bus 4-1 and the first distributed photovoltaic 4-2 A first carrier meter 7-1 is connected to collect power distribution data at the output end of the first distributed photovoltaic 4-2, and a first carrier meter 7-1 is connected between the first AC bus 4-1 and the first conventional load 4-3 for collecting the first conventional load. The second carrier meter 7-2 of the power distribution data of the load 4-3, the second AC bus 5-1 and the second distributed photovoltaic 5-2 are connected to the second distributed photovoltaic 5-2 for collecting the output power distribution of the second distributed photovoltaic 5-2 A third carrier meter 7-3 for data, a fourth carrier meter 7-4 for collecting power distribution data of the second conventional load 5-3 is connected between the second AC bus 5-1 and the second conventional load 5-3, A fifth carrier meter 7-5 for collecting power distribution data of the DC load 3-2 is connected between the DC load 3-2 and the power transfer device.
[0038] The coordination controller 1-2 includes a coordination control host and a coordination control sub-machine, the coordination control host is arranged in the first low-voltage station area 4, and the coordination control sub-machine is arranged in the second low-voltage station area 5; Both the coordinating controller 1-2 and the monitoring background 1-1 are equipped with a switchboard and a comprehensive communication device PCS-9799M.
[0039] A method for coordinating the power supply systems of two low-voltage stations, which is applicable to the above-mentioned coordinating device for the power supply systems of the two low-voltage stations, comprising the following steps:
[0040] Step 1: According to the historical station area load data recorded by the monitoring background 1-1, the two pressure station areas are divided into a first low-voltage station area 4 and a second low-voltage station area 5, and the first low-voltage station area 4 is connected to the coordination control host, so The second low-voltage platform area 5 is connected to the coordination control sub-machine;
[0041] Step 2: Collect the first power distribution data of the transformers in the first low-voltage station area 4 and the second power distribution data of the transformers in the second low-voltage station area 5 every preset period;
[0042] Step 3: The coordinating controller 1-2 analyzes the first power distribution data and the second power distribution data, and screens out the faulty station area. If the first low-voltage station area 4 or the second low-voltage station area 5 fails, the power support module The energy storage system is discharged for short-term operation of normal loads in the faulty station area.
[0043] In step 1, the coordinated control host computer also collects the position of the molded case circuit breaker B1 set in the first low-voltage station area 4, the voltage on the low-voltage side of the substation and the current on the low-voltage side of the substation, and the coordinating control host sends out control commands to Control the opening and closing of the molded case circuit breaker B1; the coordinated control sub-machine also collects the position of the molded case circuit breaker B2 connected to the low-voltage side of the second low-voltage platform area 5, the voltage of the low-voltage side of the transformer and the current of the low-voltage side of the transformer. The coordinated control sub-machine controls the opening and closing of the molded case circuit breaker B2 by issuing a control command; the coordinated control host receives the information collected by the control sub-machine through optical fiber communication and sends a control command, and the coordinated control sub-machine also receives the coordinated control The control command of the host computer is used to control the tripping of the output contact of the molded case circuit breaker B2.
[0044] In step 2, the first power distribution data includes the transformer low-voltage side current in the first low-voltage station area 4 , and the second power distribution data includes the transformer low-voltage side current in the second station area 5 .
[0045] In step 3, the coordinating controller 1-2 compares the first power distribution data and the second power distribution data with the historical data, and if there is a substantial increase, it is judged that the station area with the large increase phenomenon is a faulty station area.
[0046] When a fault occurs in the first low-voltage station area 4 or the second low-voltage station area 5 screened out in step 3, the coordinating controller 1-2 issues a control command to control the output contacts of the molded case circuit breaker B1 or the molded case circuit breaker B2 to trip.
[0047] Discharging 3-1 of the energy storage system in Step 3 includes the following steps:
[0048] 4.1 The control coordinator 1-2 issues control commands;
[0049] 4.2 The energy storage battery in the energy storage system 3-1 discharges 3-1-2 and performs boost processing through the DC/DC converter 3-1-1;
[0050] 4.3 After the step-up treatment, the electric energy is transmitted to the two low-voltage areas to maintain the short-term operation of the loads in the two areas.
