DC interference test control system

A DC interference and test line technology, which is applied in the field of DC interference testing, can solve problems such as major power grid accidents, substation or power plant shutdown accidents, and no simulation environment has been established, so as to ensure safe operation, huge economic and social benefits, and improve Effect of Immunity to DC Interference

Inactive Publication Date: 2011-10-05
NORTH CHINA GRID +2
3 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

If the interference on the DC secondary circuit is light, it will cause incorrect action due to the relay protection device getting wrong information; if the interference on the DC secondary circuit is heavy, it will cause multiple switches to trip without fault at the same time, resulting in substation failure. Or the power plant is completely shut do...
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Abstract

The embodiment of the invention provides a DC interference test control system. The system comprises a DC interference simulation device and an upper control device, wherein the DC interference simulation device comprises a control panel and a realization circuit, and the control panel comprises an upper machine communication unit and a component driving unit; and the upper control device comprises a lower machine communication unit, a quick contact adjusting unit, a simulation resistance adjusting unit, an equivalent capacity adjusting unit and a grounding resistance adjusting unit. The upper control device sends a generated control instruction to the control panel of the DC interference simulation device, and the control panel controls components in the realization circuit of the DC interference simulation device according to the control instruction. The DC interference test control system is used for carrying out relay protection DC interference test detection, and the DC groundingresistance and the AC entering resistance of tested secondary equipment are increased.

Application Domain

Technology Topic

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  • DC interference test control system
  • DC interference test control system
  • DC interference test control system

Examples

  • Experimental program(2)

Example Embodiment

[0023] Example 1
[0024] like figure 1 As shown, it is the DC interference test control system of the embodiment, the system includes: a DC interference simulation device 100 and an upper control device 200 ; the DC interference simulation device 100 includes: a control board 101 and an implementation circuit 102 . The upper control device 200 is connected to the DC interference simulation device 100 through an Ethernet port. The battery pack 301 provides power for the DC interference simulation device 100 , and the charging device 302 charges the battery pack 301 . The device under test is connected to the test interface of the DC interference simulation device 100 .
[0025] like figure 2 As shown, the implementation circuit 102 further includes: a DC positive interface for connecting to the positive pole of an external DC power supply; a DC negative interface for connecting to the negative pole of the external DC power supply; ;The negative interface of the device under test is used to connect the negative pole of the external device under test; the DC positive interface and the positive interface of the device under test are connected in series with a cable analog resistance, a quick contact, and an equivalent capacitance through a test line with a gating jack. Access point and interference signal access point; cable analog resistance, equivalent capacitance access point and interference signal access point are connected in series between the DC negative interface and the negative interface of the device under test through a test line with a gating jack; Equivalent capacitance is connected in series between the equivalent capacitance access point and the ground through a test line with a gating jack; between the interference signal access point and the interference source, a ground resistance and fast Contact; connecting piece, used to insert the strobe hole to make the test lead conduct.
[0026] exist figure 2 middle:
[0027] 1) There are two jacks and a connecting piece on the screen. The jacks are made according to the wire head standard of the test wire. The connecting pieces are divided into two types, one is without holes on the beam, and the other has a hole on the beam, which can also be inserted for testing. Wire. Then make two types of connecting pieces spanning "point A" and "point B" and "point E" and "point F".
[0028] 2) in figure 2 All the holes marked with "DC positive", "DC negative", "ground" and "AC live" are connected with test leads.
[0029] 3) "Insulation monitoring resistance R1", "Insulation monitoring resistance R2", "DC power supply", "DC power supply equivalent internal resistance" are schematic diagrams, and there is no physical counterpart in the DC interference test device of this embodiment.
[0030] 4) "J11", "J12", "J13", etc. are quick contacts, and the on-off of these contacts can be controlled by the test control device respectively, and the time is controllable. It is a dry contact and requires a certain capacity. like Figure 4 Shown is the circuit diagram of the quick contact.
[0031] 5) "Grounding resistance R+", "Grounding resistance R-", "R11", "R12", "R13", "R14", "Grounding resistance R15", "Grounding resistance R16", etc. are available test control device control resistances value of resistance.
[0032] 6) "DC system positive equivalent capacitance", "DC system negative equivalent capacitance", "positive and negative cable equivalent capacitance", "C11", "C12", "C13", "C14", "C15", " C16", "C17", "C18", etc. are capacitors whose capacitance value can be controlled by the test control device.
[0033] 7) The quick contact adopts the contact of the quick relay, and the on and off time is required to be controlled within a few milliseconds, and the capacity has the ability to break the arc when the AC is mixed with the DC, and there is a certain margin.
[0034] 8) The DC interference test device and the test control device in this embodiment are connected by a network cable, and the capacitance value and the resistance value can be modified on the test control device.
[0035] 9) The charging device 302 charges the battery pack 301, the battery pack 301 provides working power for the DC interference simulation device 100, and the device under test 400 is the secondary equipment in the power system, such as: relay protection device, relay, operation box, etc.
[0036] like image 3 As shown, the control board 101 includes: a communication unit 101a with the upper computer, for receiving the control instructions sent by the upper control device, and feeding back control information to the upper control device; On the circuit, components including analog resistance, equivalent capacitance, grounding resistance and quick contact are controlled.
[0037] like Figure 4As shown, the upper control device 200 includes: a communication unit 201 with the lower computer, for sending control instructions to the DC interference simulation device and receiving control information fed back by the DC interference simulation device; a quick contact adjustment unit 202 for receiving user input Quick contact state information, and generate a fast node on/off state control command according to the quick contact state information; the analog resistance adjustment unit 203 is used to receive the analog resistance value input by the user, and generate the analog resistance value control according to the analog resistance value instruction; the equivalent capacitance adjustment unit 204 is used to receive the equivalent capacitance value input by the user, and the equivalent capacitance value control instruction generated according to the equivalent capacitance value; the grounding resistance adjustment unit 205 is used to receive the grounding resistance input by the user value, and generate the grounding resistance resistance control command according to the grounding resistance value.
[0038] like Figure 5 As shown, the upper control device includes: a component state setting interface; the component state setting interface includes a display area for components to be set and a component setting toolbar. The to-be-configured component display area displays the resistance, capacitance and fast node settings of the relay protection DC interference test device. Resistance and capacitance include branch resistance, branch capacitance, grounding resistance, equivalent capacitance of positive and negative cables, equivalent capacitance of positive and negative electrodes, and grounding resistance of positive and negative electrodes. Fast node settings include on-off and short-circuit time settings.
[0039] like Image 6 As shown, the toolbar includes:
[0040] New state file button, used to create a new state file;
[0041] Open state file button, used to open an existing state file;
[0042] Save state file button, used to save as state file;
[0043] Download resistor-capacitor button to download the resistor-capacitor value in the current state file to the test control device. For example, after setting the resistance and capacitance values ​​in the component state setting interface of the upper control device, make sure to disconnect the 220VDC experimental power supply of the relay protection DC interference simulation device, and click the download resistance-capacitance button. After that, the upper control device software downloads the resistance and capacitance values ​​to the corresponding components of the DC interference test device immediately, and the 220VDC experimental power supply is allowed to be turned on after the adjustment is completed and the inspection is correct.
[0044] Download the short-circuit switch button data, and download the four fast node types J2, J3, J+, J- states in the current state file to the test control device. For example, to download J2, J3, J+, J- short-circuit switches: After setting the four value fast nodes of J2, J3, J+, J- in the component status setting interface of the upper control device, click the download short-circuit switch button After that, the upper control device downloads the breaking information and short-circuit time of J2, J3, J+, J- to the corresponding switch of the DC interference test device. Download J1 fast node: Set the fast node J1 on the component status setting interface of the upper control device, and the upper control device will download the breaking information of J1 to the corresponding switch of the DC interference test device immediately.
[0045] The fast node can be switched on and off, without disconnecting the 220VDC experimental power supply of the test control device.
[0046] The state sequence edit button is used to open the state sequence edit box.
[0047] like Figure 7 As shown, in the state sequence editing box, users can flexibly edit, save, and download state sequence files according to their needs. The state sequence editing unit includes: a state sequence number input module, which is used to input the state sequence number; a current state number selection module, which is used to select the current state number; a trigger mode selection module, which is used to select a time trigger mode or an open-input trigger mode; The trigger time input module is used to input the trigger time; the trigger switch input selection module is used to select the trigger switch type; the state file name modification module is used to modify the name of the current state file.
[0048] In the software toolbar, click the "State Sequence Edit" button open as Figure 7 The state sequence edit box shown. In the state sequence editing box, you can set the number of state sequences first, and then click the "Load state file" button to select the corresponding state file. Save the edited state sequence file as a file with the extension “.sta” after clicking “Save State Sequence File”. Click the "Open State Sequence File" button to open the corresponding file. Click the "Download State Sequence File" button to download the parameters in the state sequence file, such as the parameters set in State 1 and State 2, to the DC interference test device.
[0049] In the DC interference test system of the embodiment of the present invention, the parameters of each component are designed according to the parameters of the DC system, and the size of the parameters can be flexibly configured. The embodiment of the present invention increases the simulation function of the fault and interference of the DC system of the substation, and can carry out the test of the power grid relay protection and the safety automatic device against the interference of the secondary circuit of the DC system in the laboratory environment. It can reproduce the accident caused by the interference of the DC system of the substation, and formulate the measures for the relay protection device to resist the interference of the DC system.

Example Embodiment

[0050] Example 2
[0051] like Figure 8 As shown, the DC interference test system of this embodiment includes: a plurality of DC interference simulation devices (100a, 100b and 100c) and a host computer 200 as a host control device; the DC interference simulation devices (100a, 100b and 100c) are controlled by a network The box 500 is connected to the host computer 200 . Each DC interference simulation device includes: a control board and a realization circuit. The battery pack 301 provides power for the DC interference simulation devices (100a, 100b and 100c), and the charging device 302 charges the battery pack 301. The devices under test (400a, 400b and 400c) are connected to the test interfaces of the corresponding DC interference simulation devices (100a, 100b and 100c).
[0052] The circuit connection relationship of the DC interference test system with three DC interference simulation devices is as follows Figure 9 shown. Wherein, the realization circuit of each DC interference simulation device (100a, 100b and 100c) includes: DC positive interface, used to connect the positive pole of the battery pack; DC negative interface, used to connect to the negative pole of the battery pack; It is used to connect the positive pole of the external device under test; the negative terminal of the device under test is used to connect the negative pole of the external device under test; a cable is connected in series between the DC positive interface and the positive terminal of the device under test through a test line with a gating jack Analog resistance, quick contact, equivalent capacitance access point and interference signal access point; between the DC negative interface and the negative interface of the device under test, a cable analog resistance, equivalent capacitance connection is connected in series through a test line with a gating jack. The access point and the interference signal access point; the equivalent capacitance is connected in series between the equivalent capacitance access point and the ground through the test line with the gating jack; the gating jack is connected between the interference signal access point and the interference source. The test wire is connected in series with a grounding resistance and a quick contact; the connecting piece is used for inserting the strobe hole to make the test wire conduct. exist Figure 9 middle:
[0053] (1) There are two jacks and a connecting piece on the screen. The jacks are made according to the wire head standard of the test wire. The connecting pieces are divided into two types, one is without holes on the beam, and the other has a hole on the beam, which can also be inserted for testing. Wire. Then make two types of connecting pieces spanning "point A" and "point B" and "point E" and "point F".
[0054] (2) All the holes marked with "DC positive", "DC negative", "ground" and "AC live wire" on the picture are connected to the wires on the back of the screen as required.
[0055] (3) "Insulation monitoring resistance R1", "Insulation monitoring resistance R2", "DC power supply", "DC power equivalent internal resistance" are the rechargeable battery packs of the system.
[0056] (4) in Figure 9 Three branches (ie: three DC interference test devices) are drawn above, and in fact, multiple branches can be designed according to the size of the screen, such as five branches.
[0057] (5) "J+", "J-", "J11", "J12", "J13", etc. are quick contacts, which can be set by the host computer to control the on-off of these 17 contacts respectively. The time is controllable and used for short-circuiting. AC/DC or DC grounding or device contact action, etc., the contacts are dry contacts and require a certain capacity.
[0058] (6) "Grounding resistance R+", "Grounding resistance R-", "R11", "R12", "R13", "R14", "Grounding resistance R15", "Grounding resistance R16", etc. can be controlled by the host computer. value of resistance.
[0059] (7) "equivalent capacitance of positive pole of DC system", "equivalent capacitance of negative pole of DC system", "equivalent capacitance of positive and negative cables", "C11", "C12", "C13", "C14", "C15", "C16", "C17", "C18", etc. are capacitors whose capacitance values ​​can be controlled by a host computer.
[0060] (8) Many cables are equivalent to π models in the system of this embodiment.
[0061] (9) Parameters of each component:
[0062] (9.1) The withstand voltage of controllable resistance, capacitance and contact is DC 600V;
[0063] (9.2) The adjustment step of the controllable resistance of the branch is 1Ω, and the maximum withstand current is 3A;
[0064] (9.3) The adjustment step of the branch controllable capacitor is 0.05μF;
[0065] (9.4) The level difference between the positive and negative adjustable equivalent capacitors of the DC system is 1μF.
[0066] (10) The quick contact adopts the contact of the quick relay, and the on and off time is required to be controlled within a few milliseconds, and the capacity has the arc breaking ability when the AC is mixed with the DC, and there is a certain margin.
[0067] (11) The back of the detection platform is mounted on the chassis, and two rows of phoenix terminals are installed on both sides to lead the positive and negative DC, AC live wires and grounding to the terminal row.
[0068] like Figure 8 As shown, the host computer 200 generates control instructions, and transmits the control instructions to the control boards in the DC interference simulation devices (100a, 100b and 100c) through the network control box 500, and the control boards correspond to the respective control boards according to the control instructions transmitted from the host computer. The resistance, capacitance and fast contact in the realization circuit are controlled. The control accuracy can reach the millisecond level, and the action behavior control of the fast contact is programmable.
[0069] The control mode of the system in this embodiment includes: the setting of resistance and capacitance values ​​and the on-off of fast nodes are set by the upper computer, and the communication between the upper computer and the DC interference simulation device is through Ethernet. In the DC interference test system of this embodiment, the DC interference simulation device can be set in a DC interference test cabinet, and each DC interference test cabinet can be set with a plurality of DC interference simulation devices, and each DC interference simulation device has a DC interference simulation device. IP address, each DC interference simulation device forms a test branch. For example, three to five DC interference simulation devices can be set in each DC interference test cabinet.
[0070] After the DC interference simulation device is powered on (220VAC), it can communicate with the host computer through Ethernet. Each branch (each DC interference simulation device) has its own IP address (for example, the IP address of branch 1 is 192.168.1.133). The communication between the multiple branches and the upper computer is switched through the switch-in, switch-out, indicator lights and the network control box 500, and all the DC interference simulation devices can also be connected to the local area network.
[0071] The DC interference simulation device is composed of two parts: the control board and the realization circuit. like image 3As shown, the control board includes: a communication unit 101a with the host computer and a component drive unit 101b, and the communication unit 101a with the host computer is realized by an ARM microprocessor; the component drive unit 101b is realized by a digital signal processor (DSP) and an expansion circuit . The ARM microprocessor has an Ethernet interface, is responsible for communicating with the upper computer, and controls the DSP according to the component control instructions sent from the upper computer. DSP controls the state of the resistor network, capacitor network and quick contact in the realization circuit through the expansion circuit according to the component control instructions from the ARM microprocessor.
[0072] The upper computer includes: a communication unit with the lower computer, which is used to send control instructions to the ARM microprocessor and receive the control information fed back by the ARM microprocessor; The fast contact state information generates fast node on/off state control instructions; the analog resistance adjustment unit is used to receive the analog resistance value input by the user, and generate the analog resistance resistance value control instruction according to the analog resistance value; the equivalent capacitance adjustment unit, It is used to receive the equivalent capacitance value input by the user, and generate the equivalent capacitance value control command according to the equivalent capacitance value; the grounding resistance adjustment unit is used to receive the grounding resistance value input by the user, and generate the grounding resistance according to the grounding resistance value Resistance control command. The ARM microprocessor controls the received fast node on/off state control instructions, analog resistance resistance control instructions, equivalent capacitance capacitance control instructions and/or grounding resistance resistance control instructions to control the DSP; the DSP controls the DSP according to the ARM microprocessor The control command of the transmitted components realizes the resistance network, the capacitance network and the quick contact in the circuit through the expansion circuit control.
[0073] Figure 5 The test branch in contains the minimum system to realize the ground interference test of the DC interference test system, which can complete the basic test function of the ground interference test of the system in this embodiment. This example only lists one test branch, namely Figure 5 The control process of a DC disturbance simulation device shown in the circuit display area.
[0074] Disconnect the 220VDC experimental power supply of the DC interference simulation device, disconnect J11, and ensure that the test branch is not charged; set the resistance and capacitance values ​​in the DC test circuit on the setting interface of the host computer, and the software setting area interface after setting is as follows Figure 10 shown.
[0075] Set the equivalent capacitance of positive and negative cables = 2μF;
[0076] Set each resistance value of the test branch: R11=5Ω, R12=2Ω, R13=2Ω, R14=2Ω;
[0077] Set each capacitance value of the test branch: C11=1μF, C12=1μF, C13=0μF, C14=0μF, C15=1μF, C16=1μF, C17=0μF, C18=0μF;
[0078] Set grounding resistance R15=2Ω, grounding resistance R16=10Ω;
[0079] Let the grounding resistance R+ be 11.25kΩ and the grounding resistance R- be 11.25kΩ;
[0080] Set the equivalent capacitance of the positive pole of the DC system = 10 μF, and the equivalent capacitance of the negative pole of the DC system = 10 μF.
[0081] Click the "Download Resistor Capacitor button" on the upper computer software toolbar After that, the upper computer software analyzes the resistance and capacitance values ​​according to the resistance and capacitance implementation scheme, and the analyzed resistance and capacitance values ​​are downloaded to the DC interference simulation device through the Ethernet port of the upper computer through the switch-in, switch-out, indicator lights and network control box. The control board, after the communication port on the control board receives the data, it is transparently transmitted to the DSP through the ARM processor, and the DSP controls the expansion circuit, and the expansion circuit controls the resistance, capacitance and quick contact in the realization circuit of the DC interference simulation device, so as to Adjust the value of the resistance and capacitance and the on/off state of the quick contact, and ensure that the test branch is not charged during the adjustment process. After the resistance and capacitance values ​​are adjusted and checked, turn on the 220VDC experimental power supply of the DC interference test device.
[0082] In the component state setting interface of the host computer, set the J11 switch of the test branch to the closed state, see Figure 11 As shown, the upper computer software immediately transmits the switch state of J11 to the control board, and the control board immediately controls the realization circuit and closes the J11 node.
[0083] In the component state setting interface of the host computer, set the J12 node to close, set the J11 closing start time to 1ms, and the end time to 1000ms. After setting the parameters of J12, see the interface. Figure 12 shown, Figure 12 The short-circuit plug marked in the switch is switched on the panel of the test branch (ie, the DC interference simulation device), and the short-circuit plug can be connected to ground to simulate the ground fault of the DC system; the short-circuit plug can also be connected to the AC live wire to simulate the AC live wire and the DC system. Fault.
[0084] In the component status setting interface of the host computer, after setting the J2, J3, J+, J- fast nodes, click the "Download short-circuit switch button" in the toolbar of the host computer. The status of J2, J3, J+, J- fast nodes is analyzed and issued by the host computer software, and the analyzed values ​​are downloaded to the DC interference simulation device through the Ethernet port of the host computer through the switch-in, switch-out, indicator lights and network control box. The control board, after the communication port on the control board receives the data, it is transparently transmitted to the DSP through the ARM processor, and the DSP controls the closing of J12 according to the closing start time set by the upper computer software to simulate the grounding of the DC system or the AC live wire. The series-DC system is faulty.
[0085] In the DC interference test system of this embodiment: the rated DC is led from the bus bar connected with the rechargeable battery pack to the DC interference test cabinet, and the output is a fixed 230V DC; the adjustable DC is led from the DC remote monitoring cabinet to the DC interference test cabinet, and the output is It can be set as 60%~110%Un, which can be realized by accepting the input command or software command through the DC remote monitoring system. The DC interference test cabinet includes at least a DC interference test device and a control device. The DC remote monitoring cabinet is used for remote monitoring of DC equipment such as charging equipment and rechargeable battery packs.
[0086] The system of this embodiment realizes the simulation function of the fault and interference of the DC system of the substation, and can carry out the test of the power grid relay protection and the safety automatic device against the interference of the secondary circuit of the DC system. It can reproduce the accident caused by the interference of the DC system of the substation, and formulate the measures for the relay protection device to resist the interference of the DC system.
[0087] The DC system of the substation or power plant is seriously abnormal, which may cause a complete shutdown accident of the substation or power plant, which greatly threatens the safe and stable operation of the power grid. The system in this embodiment can effectively improve the anti-DC interference capability of the secondary equipment and ensure the safe operation of the power grid. The economic and social benefits are enormous. For example, when the DC system is disturbed, the loss caused by the power outage of the whole power plant is calculated according to the power outage of a medium-capacity power plant (1000MW) for one day, and the loss of electricity is 24,000MW·h, equivalent to nearly 10 million yuan.
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