CN112834858A - On-site detection method for direct-current energy consumption device - Google Patents
On-site detection method for direct-current energy consumption device Download PDFInfo
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Abstract
The invention discloses a field detection method of a direct current energy consumption device, which comprises the steps of responding to the completion of connection of an alternating current system, a converter valve and the direct current energy consumption device, closing an alternating current side switch, and charging the converter valve and the direct current energy consumption device; controlling the direct current energy consumption device to normally work in response to the completion of the active charging of the converter valve submodule; according to a preset rule, modifying a control threshold value in a control system of the direct current energy consumption device to enable the direct current energy consumption device to complete a switching process; acquiring the electric quantity waveform and the resistance temperature in the switching process; and detecting the direct current energy consumption device according to the electrical quantity waveform and the resistance temperature. According to the invention, additional equipment is not required to be constructed, and the field detection of the direct current energy consumption device is realized by modifying the control threshold, so that the cost is greatly reduced.
Description
Technical Field
The invention relates to a field detection method for a direct current energy consumption device, and belongs to the technical field of flexible direct current transmission.
Background
Compared with a conventional direct-current transmission system, the flexible direct-current transmission system has the advantages of capability of supplying power to a passive network, flexibility in control, no need of additionally adding reactive compensation equipment and the like, and the technical advantages presented by the flexible direct-current transmission system meet the requirement of long-distance grid connection of a wind power plant. The grid connection of large-scale onshore or offshore wind power plants through a flexible direct power transmission system is a future development trend.
The wind power plant and the grid-connected system thereof have certain fault ride-through capability, namely when different types of faults occur in the connected power grid, the wind power plant is ensured not to be disconnected within the required time and voltage fluctuation range, and continues to normally operate after the faults are cleared. For a wind power plant passing through a flexible direct grid-connected system, when the voltage of an accessed alternating current system drops due to faults and the like, the sending power of the whole direct current system is instantaneously reduced, the power sent out by the wind power plant is kept unchanged in a short time, and the surplus power can cause the direct current voltage to be raised, so that the action of protection and the locking of a converter valve are caused, and the wind power plant is disconnected. In order to avoid this situation, the dc side energy dissipation device shown in fig. 1 is configured to implement fault ride-through of the wind farm and the grid-connected system thereof, and surplus power is consumed by the energy consumption device, so as to control the stability of the dc voltage.
The dc dissipation devices have a plurality of structures, but all of them can be equivalent to a series connection of a control switch K and a dissipation resistor R, as shown by a dashed line in fig. 1, the energy dissipated by the resistor R is dynamically adjusted by controlling the on/off of the control switch K, so as to maintain the stability of the dc voltage.
The switching process of the direct current energy consumption device is as follows:
1) when the direct-current interelectrode voltage Udc is detected to be higher than an initial voltage threshold value Uset1 for the first time, a switch K is closed, and a resistor R is switched in; wherein the initial voltage threshold Uset1 is an initial control threshold;
2) the resistance back-off control is carried out, namely,
when detecting that the direct-current interelectrode voltage Udc is lower than a voltage lower limit threshold value Uset2, switching off a switch K, and withdrawing a resistor R; when detecting that the direct-current interelectrode voltage Udc is higher than a voltage upper limit threshold value Uset3, closing a switch K and putting a resistor R into operation;
3) repeating the resistance retreating control, if the continuous working time of the direct current energy consumption device exceeds a time threshold Tset, the heating of the energy consumption resistance reaches a limit value, the energy consumption device is wholly retreated for cooling, and the switch K is disconnected and is not closed any more; if the time length reaches Tset, the fault of the power grid at the alternating current side is recovered, and the direct current voltage is no longer higher than Uset3, the fault ride-through is successful, and the normal operation is recovered; the upper voltage threshold value Uset3, the lower voltage threshold value Uset2 and the duration threshold value Tset are process control threshold values.
Before the flexible direct power transmission system containing the direct current energy consumption device is put into operation formally, the direct current energy consumption device needs to be detected on site. During detection, the real working condition of the device needs to be simulated, namely, direct current voltage is provided. For this reason, there is a patent that proposes to construct a dc voltage generating device to supply a dc voltage, which greatly increases the cost.
Disclosure of Invention
The invention provides a field detection method for a direct current energy consumption device, which solves the problems disclosed in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for detecting a DC energy consumption device on site comprises,
in response to the completion of the connection of the alternating current system, the converter valve and the direct current energy consumption device, closing an alternating current side switch to charge the converter valve and the direct current energy consumption device;
controlling the direct current energy consumption device to normally work in response to the completion of the active charging of the converter valve submodule;
according to a preset rule, modifying a control threshold value in a control system of the direct current energy consumption device to enable the direct current energy consumption device to complete a switching process;
acquiring the electric quantity waveform and the resistance temperature in the switching process;
and detecting the direct current energy consumption device according to the electrical quantity waveform and the resistance temperature.
And in response to the completion of the connection of the alternating current system, the converter valve and the direct current energy consumption device, the active charging target value of the converter valve submodule is reduced, and the alternating current side switch is closed, so that the converter valve and the direct current energy consumption device are charged.
The active charging target value of the converter valve submodule after being reduced is slightly larger than the voltage of the converter valve submodule after uncontrolled charging is completed.
The control threshold comprises a process control threshold and an initial control threshold, wherein the process control threshold comprises a lower voltage threshold, an upper voltage threshold and a duration threshold; the initial control threshold comprises an initial voltage threshold.
And according to a preset rule, sequentially modifying a process control threshold value and an initial control threshold value in the control system of the direct current energy consumption device to enable the direct current energy consumption device to complete a switching process.
The switching process of the direct current energy consumption device is completed when the continuous working time of the direct current energy consumption device exceeds a time threshold value.
The preset rule is that the number of the preset rules is,
voltage regulation:
Udc＞Uset1≥Uset3＞Uset2
wherein, Uset2 is a lower voltage threshold, Uset3 is an upper voltage threshold, Uset1 is an initial voltage threshold, and Udc is the voltage at two ends of the direct current energy consumption device;
the time length rule is as follows:
the resistance retreating control can be completed for many times within the time length threshold.
Modified Uset1 and Uset3 were slightly below Udc, Uset1= Uset3, Uset2 were slightly below Uset 3; tset is as short as possible on the premise that the time length rule is satisfied.
According to the waveform of the electric quantity and the temperature of the resistor, the direct current energy consumption device is detected,
according to the electric quantity waveform and the resistance temperature, respectively judging whether the switching process of the direct current energy consumption device and the resistance heat dissipation meet respective corresponding requirements;
and if the requirements are met, the direct current energy consumption device is detected normally.
The invention achieves the following beneficial effects: 1. according to the invention, no additional equipment is required to be constructed, and the field detection of the direct current energy consumption device is realized by modifying the control threshold value, so that the cost is greatly reduced; 2. under normal conditions, the direct current energy consumption device can perform switching action only in an end-to-end operation mode of a direct current transmission system, the function of the direct current energy consumption device can be detected during a single-station single-end test period, potential problems can be found in advance without waiting for the end-to-end operation period, and subsequent other tests can be guaranteed to be performed smoothly; 3. the detection method is in a scene that after the converter valve submodule is actively charged and before the converter valve is unlocked, the voltage between poles on the direct current side is about 0.73pu and is the lowest direct current voltage which can be provided by the converter valve under normal conditions, under the condition of the same input time, the lower the direct current voltage is, the smaller the power consumed by the switching of the direct current energy consumption device is, and the influence of the detection under the direct current voltage level on an alternating current system is also the smallest; 4. the direct-current voltage required by detection is generated by an alternating-current system after uncontrolled rectification of the converter valve, but not generated by control of the converter valve, so that the voltage is relatively stable, coupling influence of switching of the energy consumption device and control of the converter valve on the direct-current voltage is not required to be considered during detection, transient characteristics of switching of the energy consumption device are only required to be considered for analysis of a detection result, and the method is simple and visual.
Drawings
FIG. 1 is a schematic diagram of the operation of a DC energy dissipation device;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a diagram of detection wiring;
fig. 4 is a simulation example waveform.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 2, a method for on-site detection of a dc energy consuming device includes the following steps:
step 1, responding to the completion of connection of an alternating current system, a converter valve and a direct current energy consumption device, reducing an active charging target value of a converter valve submodule, and closing an alternating current side switch to charge the converter valve and the direct current energy consumption device.
The flexible direct power transmission engineering field electrical equipment comprising the direct current energy consumption device is installed as shown in fig. 3, and an alternating current system, a converter valve and the direct current energy consumption device are sequentially connected; the converter valve plays a role in conversion between alternating current and direct current, and the direct current energy consumption device is connected between the positive pole and the negative pole of the direct current transmission line. In practice, there are also devices on site such as converter transformers, charging circuits, grounding circuits, etc., which have no effect on the detection.
Normally, the charge-up unlocking of a modular multilevel converter valve using half-bridge sub-modules can be divided into three phases. The first stage is an uncontrolled charging stage, after charging reaches a steady state, the voltage Usm of a converter valve sub-module is about 0.73pu, and the voltage Udc (hereinafter referred to as "direct current side voltage") at two ends of a direct current energy consumption device is also about 0.73 pu; the second stage is an active charging stage of the converter valve sub-module, after the charging reaches a stable state, the voltage Usm of the converter valve sub-module is about 1pu, and the voltage Udc of the direct current side is about 0.73 pu; and in the third stage, the converter valve is unlocked, the voltage Usm of the converter valve sub-module is 1pu after the converter valve sub-module reaches a steady state, and the voltage Udc of the direct current side is 1 pu.
The detection method starts after the second stage is finished, and after the uncontrolled charging of the converter valve is finished, the voltage Usm of a converter valve sub-module can reach about 0.73 pu. Subsequently, the sub-modules are actively charged, and the converter valve sub-module voltage Usm usually reaches about 1 pu. If the detection is carried out under the condition, the transient process of switching of the direct current energy consumption device is accompanied with charging and discharging of the converter valve submodule, and the voltage of the converter valve submodule is possibly higher than 1pu and even is overvoltage.
In order to avoid the above situation, the active charging target value of the converter valve sub-module needs to be reduced, and the active charging target value of the converter valve sub-module after the reduction is generally slightly larger than the voltage of the converter valve sub-module after the uncontrolled charging is completed. The target value Usmset is generally selected within a range of 0.73 pu-1 pu, and the value should be as small as possible to avoid overvoltage of a converter valve sub-module in a switching test process of a subsequent direct current energy consumption device, for example, Usmset =0.8pu is selected, that is, only the sub-module voltage is charged to 0.8pu instead of 1pu in an active charging stage. Therefore, the active charging and voltage-sharing functions of valve control are reserved, the voltage of the sub-module at the beginning of the test is reduced to a certain extent, and the overvoltage of the sub-module of the converter valve caused by energy consumption switching is avoided.
And step 2, responding to the completion of active charging of the converter valve submodule, and controlling the direct current energy consumption device to normally work.
After the converter valve submodule is actively charged, an unlocking signal is not sent to the converter valve, the voltage Udc on two sides of the direct current energy consumption device is about 0.73pu at the moment, and a converter valve unlocking false signal is sent to the direct current energy consumption device as long as the direct current energy consumption device can normally work.
And 3, modifying a control threshold value in the control system of the direct current energy consumption device according to a preset rule to enable the direct current energy consumption device to complete a switching process.
The preset rules include:
1) voltage regulation:
Udc＞Uset1≥Uset3＞Uset2
wherein, Uset2 is a lower voltage threshold, Uset3 is an upper voltage threshold, Uset1 is an initial voltage threshold, and Udc is the voltage at two ends of the direct current energy consumption device;
2) the time length rule is as follows:
the resistance retreating control can be completed for many times within the time length threshold.
The control threshold comprises a process control threshold and an initial control threshold, wherein the process control threshold comprises a lower voltage threshold, an upper voltage threshold and a duration threshold; the initial control threshold comprises an initial voltage threshold.
Once the initial voltage threshold is modified, the direct current energy consumption device starts switching, so that the process control threshold needs to be modified first, namely, the voltage lower limit threshold, the voltage upper limit threshold and the duration threshold are modified first, and then the initial voltage threshold is modified.
The specific switching process is as follows:
firstly, detecting that Udc is higher than Uset1, closing a switch K in a direct current energy consumption device, and putting a resistor R into operation; the resistor R consumes a large amount of power, the direct-current voltage Udc is reduced, when the Udc is lower than Uset2, the switch K is disconnected, and the resistor R exits; then the direct current voltage Udc rises to a target value of 0.73pu, and when the direct current inter-pole voltage Udc is higher than Uset3 in the rising process, the switch K is closed, and the resistor R is put into use; and repeating the steps until the working time reaches Tset, and the direct current energy consumption device exits.
During the switching period of the direct current energy consumption device, direct current voltage fluctuates in a range from Uset2 to Uset3, meanwhile, the resistor needs to consume energy provided by an alternating current system, and the smaller the values of Uset2 and Uset3 are, the longer the resistor is continuously put into use, and the larger the consumed power is. In order to reduce the influence on an alternating current system as much as possible, the Uset2 and the Uset3 are not too small and only meet test conditions, generally, the modified Uset1 and Uset3 are slightly lower than Udc, Uset1= Uset3, and Uset2 is slightly lower than Uset 3; for example, Uset1= Uset3= Udc-0.1pu and Uset2= Udc-0.3pu may be selected.
It can be known from the background art that the switching process can be exited under two conditions after the direct current energy consumption device enters the switching process. One is that the dc voltage remains below Uset 3. Since the dc voltage is restored to Udc after the energy dissipation resistor is withdrawn, and the fixed value is set to Udc > Uset3, the condition that the voltage is kept below Uset3 cannot be satisfied. And secondly, the continuous working time of the direct current energy consumption device reaches a fixed value Tset, and after the time, the energy consumption device quits to wait for the resistance to dissipate heat.
Therefore, the switching process of the direct current energy consumption device is completed when the continuous working time of the direct current energy consumption device exceeds the time threshold value. The function of the energy consumption device is verified only by a few switching cycles, so the Tset does not need to be set too large, and the Tset is only as short as possible on the premise of meeting the time length rule; for example, Tset =5ms may be selected.
And 4, acquiring the electrical quantity waveform and the resistance temperature in the switching process.
And 5, detecting the direct current energy consumption device according to the electrical quantity waveform and the resistance temperature.
According to the electric quantity waveform and the resistance temperature, respectively judging whether the switching process of the direct current energy consumption device and the resistance heat dissipation meet respective corresponding requirements; if the requirements are met (i.e. the requirements of the engineering design or the technical specification are met, and different engineering requirements are different), the direct current energy consumption device is detected normally.
And after the detection is finished, restoring all the modified values to the initial state.
Fig. 4 is a waveform of a simulation example of the above-mentioned detection process. In the switching process, the input number of the sub-modules of the direct-current energy consumption device is changed within the range of 0-400. The rated value of the voltage of the direct current side (namely 1 pu) is 800kV, and the voltage of the direct current side before the switching process is started is about 584kV (0.73 pu). Rated voltage of the converter valve submodule is 2 kV. The control thresholds were set at Uset1= Uset3=0.72pu, Uset2=0.7pu, Tset =100 ms.
In fig. 4, the change of the input number of the sub-modules of the dc energy consumption device represents the switching process of the dc energy consumption device, and the change processes of the dc side voltage, the current of the energy consumption branch circuit, and the average voltage of the sub-modules of the converter valve in the process are shown in the figure. The voltage target value of active charging of the converter valve submodule is reduced, so that the converter valve submodule is ensured to have no overvoltage in the detection process. The simulation example shows that the electrical quantity waveform of the switching process of the direct current energy consumption device can be obtained by the test method provided by the invention, and then whether the requirement of the engineering design or the technical specification is met or not is judged.
According to the method, additional equipment does not need to be built, the control threshold is modified, the field detection of the direct current energy consumption device is realized, and the cost is greatly reduced. The method can detect the functions of the direct current energy consumption device in the single-end test period of a single station, and potential problems can be found in advance without waiting for the end-to-end running period, so that other subsequent tests can be carried out smoothly; the method is in a scene that after the converter valve submodule is actively charged and before the converter valve is unlocked, the voltage between poles on the direct current side is about 0.73pu and is the lowest direct current voltage which can be provided by the converter valve under normal conditions, under the condition of the same input time, the lower the direct current voltage is, the smaller the power consumed by the switching of the direct current energy consumption device is, and the influence of the detection under the direct current voltage level on an alternating current system is also the smallest; the direct-current voltage required by detection is generated by an alternating-current system after uncontrolled rectification of the converter valve, but not generated by control of the converter valve, so that the voltage is stable, coupling influence of switching of the energy consumption device and the switching of the converter valve on the direct-current voltage does not need to be considered during detection, transient characteristics of switching of the energy consumption device only need to be considered for analysis of a detection result, and the detection method is simple and visual.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (9)
1. A direct current energy consumption device field detection method is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
in response to the completion of the connection of the alternating current system, the converter valve and the direct current energy consumption device, closing an alternating current side switch to charge the converter valve and the direct current energy consumption device;
controlling the direct current energy consumption device to normally work in response to the completion of the active charging of the converter valve submodule;
according to a preset rule, modifying a control threshold value in a control system of the direct current energy consumption device to enable the direct current energy consumption device to complete a switching process;
acquiring the electric quantity waveform and the resistance temperature in the switching process;
and detecting the direct current energy consumption device according to the electrical quantity waveform and the resistance temperature.
2. The on-site detection method for the direct current energy consumption device according to claim 1, wherein the method comprises the following steps: and in response to the completion of the connection of the alternating current system, the converter valve and the direct current energy consumption device, the active charging target value of the converter valve submodule is reduced, and the alternating current side switch is closed, so that the converter valve and the direct current energy consumption device are charged.
3. The on-site detection method for the direct current energy consumption device according to claim 1, wherein the method comprises the following steps: the active charging target value of the converter valve submodule after being reduced is slightly larger than the voltage of the converter valve submodule after uncontrolled charging is completed.
4. The on-site detection method for the direct current energy consumption device according to claim 1, wherein the method comprises the following steps: the control threshold comprises a process control threshold and an initial control threshold, wherein the process control threshold comprises a lower voltage threshold, an upper voltage threshold and a duration threshold; the initial control threshold comprises an initial voltage threshold.
5. The on-site detection method for the direct current energy consumption device according to claim 4, wherein the method comprises the following steps: and according to a preset rule, sequentially modifying a process control threshold value and an initial control threshold value in the control system of the direct current energy consumption device to enable the direct current energy consumption device to complete a switching process.
6. The on-site detection method for the direct current energy consumption device according to claim 4 or 5, wherein the method comprises the following steps: the switching process of the direct current energy consumption device is completed when the continuous working time of the direct current energy consumption device exceeds a time threshold value.
7. The on-site detection method for the direct current energy consumption device according to claim 4 or 5, wherein the method comprises the following steps: the preset rule is that the number of the preset rules is,
voltage regulation:
Udc＞Uset1≥Uset3＞Uset2
wherein, Uset2 is a lower voltage threshold, Uset3 is an upper voltage threshold, Uset1 is an initial voltage threshold, and Udc is the voltage at two ends of the direct current energy consumption device;
the time length rule is as follows:
the resistance retreating control can be completed for many times within the time length threshold.
8. The on-site detection method for the direct current energy consumption device according to claim 7, wherein the method comprises the following steps: modified Uset1 and Uset3 were slightly below Udc, Uset1= Uset3, Uset2 were slightly below Uset 3; tset is as short as possible on the premise that the time length rule is satisfied.
9. The on-site detection method for the direct current energy consumption device according to claim 1, wherein the method comprises the following steps: according to the waveform of the electric quantity and the temperature of the resistor, the direct current energy consumption device is detected,
according to the electric quantity waveform and the resistance temperature, respectively judging whether the switching process of the direct current energy consumption device and the resistance heat dissipation meet respective corresponding requirements;
and if the requirements are met, the direct current energy consumption device is detected normally.
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