CN112232696B - Management and control method and management and control device for distribution network loop closing operation risk - Google Patents
Management and control method and management and control device for distribution network loop closing operation risk Download PDFInfo
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Abstract
The embodiment of the invention discloses a management and control method and a management and control device for a distribution network loop closing operation risk, wherein the management and control method comprises the steps of obtaining a wiring diagram and line data of a distribution network; establishing a distribution network loop closing model according to a wiring diagram and line data of the distribution network; based on a distribution network loop closing model, simulating a distribution network loop closing operation mode by adjusting load and bus voltage of a power flow section in a distribution network; determining the position of a risk point based on simulation test data obtained by simulating the loop closing operation of the distribution network, and formulating a loop closing risk association rule basis according to the simulation test data and the position of the risk point to form a loop closing risk evaluation function; and determining the feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function, and controlling the loop closing operation of the distribution network. The control method and the control device for the risk of the loop closing operation of the distribution network can enable the loop closing operation of the distribution network to be safer and more reliable, and improve the reliability of the risk control of the loop closing operation of the distribution network.
Description
Technical Field
The embodiment of the invention relates to a power grid loop closing technology, in particular to a management and control method and a management and control device for risk of distribution network loop closing operation.
Background
In the power grid, when maintenance needs or lines fail, normal power supply of non-maintenance sections or non-failure sections needs to be ensured by adjusting open loop points. The open loop point is regulated in two ways, namely a power failure operation mode and a loop closing operation mode, wherein the loop closing operation mode can realize uninterrupted switching, and the power failure times of users can be greatly reduced, so that the loop closing operation is carried out on the distribution network during line maintenance or faults, and the reliability of power supply of the distribution network is ensured.
At present, the existing control method for the risk of the loop closing operation of the distribution network generally can perform the loop closing operation when the phase sequence and the phase of the voltages at two sides of a loop closing point are consistent, but for an alternating current-direct current hybrid power distribution network with multiple voltage levels, if the voltage levels are more, the problem of overvoltage of the loop closing operation of the distribution network can exist due to the fact that the phase and the phase sequence are only checked, so that the system is overloaded, and the safe operation of a power grid is seriously threatened.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device for risk of distribution network loop closing operation, so that the distribution network loop closing operation is safer and more reliable, and the reliability of distribution network loop closing operation risk control is improved.
In a first aspect, an embodiment of the present invention provides a method for managing and controlling risk of a network joining operation, including:
acquiring a wiring diagram and line data of a distribution network;
establishing a distribution network loop closing model according to a wiring diagram and line data of the distribution network;
based on a distribution network loop closing model, simulating a distribution network loop closing operation mode by adjusting load and bus voltage of a power flow section in a distribution network;
determining the position of a risk point based on simulation test data obtained by simulating the loop closing operation of the distribution network, and formulating a loop closing risk association rule basis according to the simulation test data and the position of the risk point to form a loop closing risk evaluation function;
and determining the feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function, and controlling the loop closing operation of the distribution network.
Optionally, based on the distribution network loop closing model, the mode of simulating the distribution network loop closing operation by adjusting the load of the power flow section and the bus voltage in the distribution network comprises the following steps:
determining a power flow section where a loop closing point switch corresponding to loop closing operation of the distribution network is located in a loop closing model of the distribution network;
closing the simulated distribution network loop closing operation by controlling a loop closing point switch;
and (3) obtaining the operation mode of simulating the loop closing operation of the distribution network when the wind motor group outputs rated power and maximum power by adjusting the load and bus voltage of the tide section.
Optionally, obtaining the simulation test data based on a mode of simulating the loop closing operation of the distribution network includes:
calculating the ratio of the line current to the maximum allowable line current based on the line current of the distribution network obtained by simulating the loop closing operation mode of the distribution network, and obtaining the line current-carrying ratio;
and taking the power transmitted by the line of the distribution network, the line current and the line current-carrying ratio obtained based on the mode of simulating the loop closing operation of the distribution network as simulation test data.
Optionally, determining the location of the risk point based on the simulation test data obtained by simulating the loop-closing operation of the distribution network includes:
checking simulation test data obtained in the process of loop closing operation of the simulation distribution network, and determining whether risk points exist or not;
if abnormal data exist in the checking simulation test data, determining that risk points exist; the abnormal data are data exceeding a corresponding preset threshold value;
and taking the position of the abnormal data corresponding to the operation of the distribution network loop as the position of the risk point.
Optionally, determining the feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function, and controlling the loop closing operation of the distribution network includes:
according to the loop closing risk evaluation function, controlling the voltage difference of the voltages at two ends of a loop closing point of the distribution network to be within a preset voltage difference range, and controlling the power output by a converter station in the distribution network to be balanced in situ.
Alternatively, the preset differential pressure range is-0.3 kV to +0.3kV.
Optionally, when the power output by the converter station in the distribution network is balanced in situ and the voltage difference between the voltages at two ends of the loop closing point of the distribution network is within a preset voltage difference range, the circulating power of the ac/dc closed loop of the loop closing operation of the distribution network at the medium voltage side is within a preset circulating power allowable range, and when the circulating power is increased or decreased, the risk of the loop closing operation of the distribution network is correspondingly increased or decreased.
Optionally, when the voltage difference between the two ends of the loop closing point of the distribution network is increased or reduced, the risk of loop closing operation of the distribution network is correspondingly increased or reduced.
Optionally, after determining the position of the risk point based on the simulation test data obtained by simulating the loop-closing operation of the distribution network, the method further includes:
a data table of simulated test data is generated and stored.
In a second aspect, an embodiment of the present invention further provides a device for controlling risk of a network joining operation, including:
the data acquisition module is used for acquiring wiring diagrams and line data of the distribution network;
the model building module is used for building a distribution network loop closing model according to the wiring diagram and the line data of the distribution network;
the loop closing simulation module is used for simulating a loop closing operation mode of the distribution network by adjusting the load of a power flow section in the distribution network and the bus voltage based on the loop closing model of the distribution network;
the position determining module is used for determining the position of the risk point based on the simulation test data obtained by simulating the loop closing operation mode of the distribution network, and formulating a loop closing risk association rule basis according to the simulation test data and the position of the risk point to form a loop closing risk evaluation function;
and the loop closing control module is used for determining the feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function and controlling the loop closing operation of the distribution network.
According to the management and control method and the management and control device for the loop closing operation risk of the distribution network, the loop closing model of the distribution network is built according to the wiring diagram and the line data of the distribution network, the loop closing operation mode of the distribution network is simulated based on the loop closing model of the distribution network by adjusting the load of the power flow section and the bus voltage in the distribution network, and the position of the risk point is determined based on the simulation test data obtained by simulating the loop closing operation mode of the distribution network, so that a loop closing risk evaluation function is formed according to the simulation test data and the position of the risk point, the feasibility of the loop closing operation of the distribution network is determined according to the loop closing risk evaluation function, and the loop closing operation of the distribution network is controlled. Compared with the existing method for controlling the operation risk of the distribution network by checking the phase sequence and the phase of the voltages at two sides of the loop closing point, the control method and the control device for the operation risk of the distribution network, provided by the embodiment of the invention, control the operation of the distribution network according to the simulation test data and the position of the risk point, can control the voltage difference between the two ends of the loop closing point of the distribution network in a preset pressure difference range, and control the power output by a converter station in the distribution network to be balanced on site, so that the risk of the operation of the distribution network is further reduced, the operation of the distribution network is safer and more reliable, and the reliability of the control of the operation risk of the distribution network is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art distribution network connection;
fig. 2 is a flowchart of a method for managing risk of a loop closing operation of a distribution network according to a first embodiment of the present invention;
fig. 3 is a flowchart of a method for managing and controlling risk of a loop closing operation of a distribution network according to a second embodiment of the present invention;
fig. 4 is a structural block diagram of a management and control device for risk of loop closing operation of a distribution network according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic diagram of a conventional distribution network, in fig. 1, SN and SC of the transformer substation are 220kV transformer substations, WT and LW of the transformer substation are 110kV transformer substations, a line between direct current channel stations JNH, QAH, SCH is a ±160kV direct current transmission line, lines WJ and LJ are 110kV alternating current transmission lines, lines L1 and L2 are 10kV alternating current transmission lines, #1 and #2 are transformers, and FJ1 and FJ2 represent wind power plants. During normal operation of the distribution network, the switches 100, 500 and 600 are all in the off positions, the electric energy of the wind power plant FJ1 is transmitted through the transformer # 1, the electric energy of the wind power plant FJ2 is transmitted through the transformer # 2, and the generated power of the wind power plant FJ2 is transmitted through two channels, namely an alternating current line WJ and a direct current channel station JNH. The active power output of the converter of the transformer substation JNH can be controlled, so that the active power of the wind power plant FJ2 is transmitted through the direct current line after being balanced in situ, and the active power of the alternating current line WJ is close to zero. When the generated power of the wind power plant FJ2 increases to cause the active power transmitted by the ac line WJ to exceed 5MW (fixed value), the direct current channel station JNH will adjust the conduction angle of the converter, thereby increasing the active power transmitted by the direct current line and reducing the active power transmitted by the ac line WJ (making the power of the line WJ close to zero). Similarly, the direct current channel station QAH can control the active power output of the converter thereof, and transmit the remaining power after the active power of the wind power plant FJ1 is locally balanced through the direct current line, so that the active power of the alternating current line LJ is close to zero.
When the switch 100 is closed, electric energy of the wind power plant FJ2 is transmitted not only through the direct current channel station JNH and the alternating current line WJ, but also through the direct current channel station QAH and the alternating current line LJ, when the direct current channel station JNH adjusts the conduction angle of the converter, the active power transmitted by the direct current line is increased, and at the moment, the wind power plant FJ1 and the alternating current line LJ provide continuous power for the direct current channel station QAH through the switch 100, so that the active power transmitted by the alternating current line WJ cannot be reduced; under the automatic power flow control mode, the direct current channel station JNH adjusts the conduction angle of the converter, and continuously increases the active power transmitted by the direct current line until the direct current channel station JNH is fully loaded and overloaded.
In a certain alternating current power distribution network loop closing operation, a switch 100 of a transformer substation JN is closed, an alternating current closed loop 1, namely, a situation of flow redistribution in 100- & gtJN (I) & gtLJ- & gtLW- & gtSC- & gtSN- & gtWT- & gtWJ- & gtJN (II) & gt100 is formed in an alternating current system, and if the transmission power of a line WJ exceeds an alternating current/direct current hybrid power distribution network starting threshold by 5MW, the interference power transmission is started according to a preset strategy. In this case, loop 2 in the distribution network, namely 100→jn (I) →lj→lw→sc→sch→jnh→jn (II) →100 increases the power transfer to reduce the power transmitted by line WJ. Because of the loop 1, the power is continuously transmitted from the SC-LW-JN (I) -100-JN (II), so that the transmission power of the line WJ still exceeds 5MW, and the accident is easily caused by the overhigh transmission power of the line, namely the risk of the ring closing operation is high.
Example 1
Fig. 2 is a flowchart of a method for managing risk of a ring closing operation of a distribution network, which is provided in an embodiment of the present invention, and the method may be implemented by a device for managing risk of a ring closing operation of a distribution network, where the device may be implemented by software and/or hardware, and the device may be integrated in an electronic device, such as a computer, having a function of managing risk of a ring closing operation of a distribution network, and specifically includes the following steps:
and 110, acquiring a wiring diagram and line data of the distribution network.
The distribution network may be an ac/dc hybrid distribution network, the wiring diagram of the distribution network may refer to fig. 1, the line data may include voltage levels of line transmission, for example, the distribution network includes 10kV ac transmission lines, 110kV ac transmission lines, 220kV ac transmission lines, and ±160kV dc transmission lines, and the voltage levels of the transformer stations in the distribution network may include 110kV voltage levels and 220kV voltage levels. The wiring diagram and line data of the distribution network can be stored in a power grid control system, and the management and control device for the risk of the distribution network loop closing operation can acquire the wiring diagram and line data of the distribution network in the power grid control system through an input port arranged by the management and control device to establish a distribution network loop closing model.
And 120, establishing a distribution network loop closing model according to the wiring diagram and the line data of the distribution network.
The management and control device for the risk of the loop closing operation of the distribution network can establish a corresponding loop closing model of the distribution network according to the wiring diagram and the line data of the distribution network, referring to fig. 1, through each line in the actual wiring diagram of the distribution network and the specific wiring position of the transformer substation, so as to simulate the loop closing operation of the distribution network.
And 130, simulating a distribution network loop closing operation mode by adjusting the load of a power flow section in the distribution network and the bus voltage based on the distribution network loop closing model.
Specifically, based on a distribution network loop closing model, a loop closing point switch corresponding to distribution network loop closing operation and a power flow section where the loop closing point switch is located are determined, and the loop closing point switch is controlled to be closed, so that the purpose of simulating distribution network loop closing operation is achieved. When the distribution network loop closing operation is simulated, the operation mode of the distribution network loop closing operation can be simulated when the rated power and the maximum power are output by the wind motor group in the distribution network by adjusting the load of the tidal current section and the bus voltage.
And 140, determining the positions of risk points based on simulation test data obtained by simulating the loop closing operation of the distribution network, and formulating loop closing risk association rule bases according to the simulation test data and the positions of the risk points to form a loop closing risk evaluation function.
Specifically, the ratio of the line current to the maximum allowable current of the line can be calculated based on the line current of the distribution network obtained by simulating the mode of the distribution network loop closing operation, the line current carrying ratio is obtained, and the power transmitted by the line of the distribution network, the line current and the line current carrying ratio obtained by simulating the mode of the distribution network loop closing operation are used as simulation test data. And checking the simulation data obtained in the simulation distribution network loop closing operation process based on the simulation distribution network loop closing operation mode to determine whether risk points exist, if abnormal data exist in the checking simulation data, determining the risk points exist, and taking the positions of the abnormal data in the distribution network loop closing operation as the positions of the risk points. The abnormal data may be data exceeding a corresponding preset threshold, and a specific value of the preset threshold may be determined according to an actual situation, which is not limited herein. The simulated test data obtained are shown in table 1:
table 1 simulation test data
Where PRO represents the current-carrying ratio of the line, i.e. the ratio of the current transmitted on the line to the maximum allowed current of the line, the lines in table 1 correspond to the lines in fig. 1, and the analysis of table 1 is as follows:
(1) When the high-voltage ac/dc hybrid distribution network is operating normally, the loop closing operation of the switch 600 is safe, and the line current of the normal operation mode thereofChecking is "YES". Only the power flow check of two abnormal operation modes of the states M3 and M5 is NO, and the voltage difference V of the voltages at two ends of the switch 600 corresponding to the states M3 and M5 I -V II Too large, abnormal operation mode (V I -V II ≥0.7kV)。
(2)V I -V II <At 0.4kV, under any mode, the switch 600 is closed, and the tide check is YES. Differential pressure V I -V II The switch 600 is safer to operate with the loop within 0.3kV (for more risk control).
(3) As can be seen by comparing the two sets of states (M3 and M4, M5 and M6): when V is I -V II <At 0.5kV, it is advantageous to reduce the circulating power in the above loop 2, i.e. to adjust V in the closing operation I -V II Especially, V should be regulated under the extreme modes of full power generation of the fan I -V II 。
(4) Under the normal tide condition (corresponding to the mode of N1-N6), the loop closing operation of the switch 600 or the loop closing operation of the switch 500 is YES, and the tide checking is YES, while the loop closing operation of the switch 100 on the 110kV line is NO. I.e. the closing of the loop in the medium voltage distribution network is safer than the closing of the loop at the 110kV side.
(5) In states M1-M6, the switch 500 is closed and the power flow check is "NO". The switch 600 is closed and the power flow check is "YES" except for states M3 and M5 (the voltage difference is fair and large). That is, the medium-voltage side line impedance is beneficial to reducing the circulating power in the alternating-current and direct-current closed loop, and can play a positive role.
In addition, after the simulation test data is determined, a data table of the simulation test data can be generated and stored so as to conveniently call the simulation test data at any time.
And the loop closing risk association rule basis is formulated according to the simulation test data and the positions of the risk points to form a loop closing risk evaluation function, and the loop closing risk evaluation association rule and the evaluation coefficient can be formed according to the loop closing risk association rule basis to form the loop closing risk evaluation function. Extracting relevant characteristic values from simulation test data and performing expert analysisDetermining a weight value, a voltage difference evaluation coefficient c, a loop closing point position evaluation coefficient h and SCH converter station input active power evaluation coefficients s and L corresponding to the associated characteristic values 1 And L 2 The sum of the current ratios and the evaluation coefficient p, the association rule of the risk evaluation of the closed loop is shown in table 2, and each evaluation coefficient is shown in tables 3 to 6.
Table 2 associated eigenvalues and corresponding weight values for the risk of closing the ring
Wherein the associated characteristic value of the risk of closing the ring is such as V I -V II I.e. V in Table 1 I -V II 。
TABLE 3 Voltage difference evaluation coefficient
TABLE 4 evaluation coefficients of the positions of the closed-loop points
Table 5 SCH converter station input active power rating factor
Table 6L 1 And L 2 Sum of current-carrying ratios evaluation coefficient
Specifically, according to the association rule and the evaluation coefficient of the risk evaluation of the closed loop shown in the above table, a risk evaluation function K, k= (0.25c+0.5h+0.2s+0.05p) ×h×t, where t is an adjustment coefficient, is 1.3.
The values of the weight values and the evaluation coefficients in the tables may be specifically set according to the actual situation, and are not limited herein.
And 150, determining the feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function, and controlling the loop closing operation of the distribution network.
The value of the ring closing risk evaluation function K (the value range of K is 0 to 1) corresponds to the degree of feasibility of the ring closing operation of the distribution network and the specific scheme of the ring closing operation of the distribution network, as shown in table 7.
Table 7 value of SCH loop closing risk evaluation function
| K takes on value | Feasibility of | Solution scheme |
| 0.7≤K＜1 | High height | Recommended mode |
| 0.5≤K＜0.7 | In (a) | Conventional mode |
| 0≤K＜0.5 | Low and low | Extreme or conventional modes |
Specifically, the following modes of operation of the distribution network loop are available:
(1) Recommendation mode: controlling the power balanced in place (110 kV load about 80 MW) and the pressure difference between two ends of the loop closing operation is beneficial to reducing the circulating power in the alternating current-direct current closed loop during loop closing. Therefore, the normal operation mode of the AC/DC hybrid distribution network is that the input active power of the SCH converter station is controlled within 80MW, the differential pressure at two ends of the loop closing operation is controlled within 0.3kV, and the loop closing operation of the switch 600 is safe without adjusting the operation mode of the high-voltage system.
(2) Extreme mode: under the extreme modes of full-power generation of a fan and the like, V is regulated I -V II The circulating power in the alternating current-direct current closed loop is reduced. While the simulation test data indicate that this approach can be checked by tidal current, there may be some risk to the actual operation.
(3) Traditional mode: and adjusting the operation mode of the high-voltage system. The operation method is to adapt to the ring closing operation requirement of the medium-voltage distribution network by adjusting the control strategy of the high-voltage alternating-current and direct-current hybrid distribution network. Although only the tripping risk of the line in the medium voltage distribution network line ring needs to be considered, the specific operation method is very complex.
Specifically, a specific mode of the loop closing operation of the distribution network can be determined according to the value of the loop closing risk evaluation function K, if K is 0.8, the feasibility of the loop closing operation of the distribution network is high, and the loop closing operation of the distribution network can be performed through a recommendation module; when K is 0.6, the feasibility of the loop closing operation of the distribution network is general, and the loop closing operation can be carried out on the distribution network through a traditional module. And from the analysis of Table 1, it can be seen that the voltage difference V between the two ends of the loop closing point of the distribution network I -V II The safety of the loop closing operation of the distribution network is affected, namely the voltage difference between the two ends of the loop closing point of the distribution network can be controlled within a preset voltage difference range (the preset voltage difference range can be-0.3 kV to +0.3 kV), the power output by a converter station in the distribution network is controlled to be balanced on site, the risk of the loop closing operation of the distribution network is reduced, the loop closing operation of the distribution network is safer and more reliable, and the reliability of the risk management and control of the loop closing operation of the distribution network is improved.
According to the management and control method for the loop closing operation risk of the distribution network, a loop closing model of the distribution network is established according to the acquired wiring diagram and line data of the distribution network, the loop closing operation mode of the distribution network is simulated by adjusting the load of a power flow section and bus voltage in the distribution network based on the loop closing model of the distribution network, the position of a risk point is determined based on simulation test data obtained by simulating the loop closing operation mode of the distribution network, loop closing risk association rule bases are formulated according to the simulation test data and the position of the risk point, a loop closing risk evaluation function is formed, the feasibility of the loop closing operation of the distribution network is determined according to the loop closing risk evaluation function, and the loop closing operation of the distribution network is controlled. Compared with the existing method for controlling the risk of the operation of the distribution network by checking the phase sequence and the phase of the voltages at two sides of the loop closing point, the method for controlling the risk of the operation of the distribution network by checking the phase sequence and the phase of the voltages at two sides of the loop closing point of the distribution network can control the loop closing operation of the distribution network according to the simulation test data and the positions of the risk points, can control the differential pressure of the voltages at two ends of the loop closing point of the distribution network to be in a preset differential pressure range, and can control the power output by a converter station in the distribution network to be balanced on site. And (3) establishing a loop closing risk association rule basis according to the simulation test data and the positions of the risk points to form a loop closing risk evaluation function, determining the feasibility of loop closing operation of the distribution network according to the loop closing risk evaluation function, and further generating a corresponding solution to further reduce the risk of the loop closing operation of the distribution network, so that the loop closing operation of the distribution network is safer and more reliable, and the reliability of the risk management and control of the loop closing operation of the distribution network is improved.
Example two
Fig. 3 is a flowchart of a method for managing risk of a ring closing operation of a distribution network, which is provided in a second embodiment of the present invention, and the method may be implemented by a device for managing risk of a ring closing operation of a distribution network, where the device may be implemented by software and/or hardware, and the device may be integrated in an electronic device, such as a computer, having a function of managing risk of a ring closing operation of a distribution network, and specifically includes the following steps:
The distribution network may be an ac/dc hybrid distribution network, the wiring diagram of the distribution network may refer to fig. 1, the line data may include voltage levels of line transmission, for example, the distribution network includes 10kV ac transmission lines, 110kV ac transmission lines, 220kV ac transmission lines, and ±160kV dc transmission lines, and the voltage levels of the transformer stations in the distribution network may include 110kV voltage levels and 220kV voltage levels. The wiring diagram and line data of the distribution network can be stored in a power grid control system, and the management and control device for the risk of the distribution network loop closing operation can acquire the wiring diagram and line data of the distribution network in the power grid control system through an input port arranged by the management and control device to establish a distribution network loop closing model.
And 220, establishing a distribution network loop closing model according to the wiring diagram and the line data of the distribution network.
The management and control device for the risk of the loop closing operation of the distribution network can establish a corresponding loop closing model of the distribution network according to the wiring diagram and the line data of the distribution network, referring to fig. 1, through each line in the actual wiring diagram of the distribution network and the specific wiring position of the transformer substation, so as to simulate the loop closing operation of the distribution network.
And 230, determining a power flow section where the loop closing point switch corresponds to the loop closing operation of the distribution network in the loop closing model of the distribution network.
Specifically, referring to fig. 1, the loop closing point switch may be a switch 600, 500 or 100, if the operation status of the loop closing operation of the distribution network during the high-voltage line such as 110kV line needs to be analyzed, the loop closing point switch is determined to be the switch 100, and the power flow section where the loop closing point switch is located, that is, the power flow section where the switch 100 is located in the distribution network, so as to simulate the loop closing operation of the distribution network based on the loop closing point switch and the power flow section.
And 240, closing the simulated distribution network loop closing operation by controlling a loop closing point switch.
Specifically, referring to fig. 1, the analog distribution network ring closing operation can be controlled by controlling the switches 600, 500 or 100 to close, when any one of the switches 600, 500 or 100 is closed, the analog distribution network ring closing operation is realized, and when one of the switches is closed to complete the analog distribution network ring closing operation, one of the other switches can be controlled to close the analog distribution network ring closing operation, so that each switch is traversed to complete the corresponding analog distribution network ring closing operation, thereby enabling the analog distribution network ring closing operation to have a more comprehensive operation state, improving the reliability of the distribution network ring closing operation control, and reducing the distribution network ring closing operation risk.
And 250, obtaining an operation mode of simulating the loop closing operation of the distribution network when the wind motor group outputs rated power and maximum power by adjusting the load and bus voltage of the tide section.
Referring to fig. 1, the operation mode of the analog distribution network closing operation can be obtained by closing the control switches 600, 500 or 100, and after the analog distribution network closing operation, the load and the bus voltage of the tidal current section, for example, the power transmitted by the line LJ, the power transmitted by the line SH and the 110kV line voltage can be adjusted, so that the operation mode of the analog distribution network closing operation when the wind motor group in the distribution network outputs rated power and maximum power corresponds to the analog test data in various states such as N1-N6 and M1-M6 shown in table 1.
Specifically, referring to fig. 1 and table 1, if the line current of the distribution network obtained based on the mode of simulating the loop closing operation of the distribution network, such as the current transmitted by the line L1, is 45A, the maximum allowable current of the line L1 is 500A, the line current-carrying ratio is 45A/500A, that is, 9%.
The power transmitted by the line may be the power transmitted by the line LJ as shown in fig. 1, the power transmitted by the line WJ, the current-carrying ratio of the line may be the current-carrying ratio of the line L1 and the current-carrying ratio of the line L2, and the obtained simulation test data are shown in table 1.
In addition, after the simulation test data are obtained, a data table of the simulation test data can be generated and stored so as to conveniently call the simulation test data at any time.
And 280, checking the simulation test data obtained in the simulation distribution network loop closing operation process, and determining whether risk points exist.
Specifically, for example, checking the simulation test data corresponding to the operation state N1 of the simulation distribution network when the switch 600 shown in the above table 1 is closed may be checking whether there is abnormal data in the simulation test data to determine whether there is a risk point in the operation of the simulation distribution network.
And step 290, if abnormal data exist in the checking simulation test data, determining that risk points exist.
The abnormal data may be data exceeding a corresponding preset threshold, and if the check that the data exceeding the corresponding preset threshold exists in the simulated test data, as shown in table 1, when the switch 600 is closed, if the power transmitted by the line LJ corresponding to the simulated distribution network loop closing operation state M5 exceeds the corresponding preset power threshold, it is determined that a risk point exists in the simulated distribution network loop closing operation at this time.
It should be noted that, the specific value of the preset threshold may be set according to the actual situation, which is not limited herein.
And 291, taking the position of the abnormal data corresponding to the operation of the loop closing of the distribution network as the position of the risk point, and formulating a loop closing risk association rule basis according to the simulation test data and the position of the risk point to form a loop closing risk evaluation function.
Specifically, if the data corresponding to the power transmitted by the line LJ in the distribution network is abnormal data when the switch 600 in fig. 1 is closed, the position of the risk point existing in the simulated distribution network loop closing operation at this time may be determined on the line LJ, so as to control the distribution network loop closing operation according to the determined position of the risk point. The process of forming the closed-loop risk evaluation function by formulating the basis of the closed-loop risk association rule is described in the first embodiment, and will not be described in detail here.
The preset differential pressure range can be-0.3 kV to +0.3kV, when the power output by a converter station in the distribution network is on-site balanced and the differential pressure of voltages at two ends of a loop closing point of the distribution network is within the preset differential pressure range, the circulating power of an alternating current-direct current closed loop of the loop closing operation of the distribution network at the medium voltage side is within a preset circulating power allowable range; when the circulating power is increased or reduced, the risk of the loop closing operation of the distribution network is correspondingly increased or reduced; when the voltage difference between the two ends of the loop closing point of the distribution network is increased or reduced, the risk of the loop closing operation of the distribution network is correspondingly increased or reduced, and as can be seen from the evaluation function of the loop closing risk and the analysis of the table 1, the voltage difference between the two ends of the loop closing point of the distribution network and the power transmitted by the line influence the safety of the loop closing operation of the simulation distribution network, so that the power output by the converter station in the distribution network is balanced on site by controlling the voltage difference between the two ends of the loop closing point of the distribution network within the preset voltage difference range, the risk of the loop closing operation of the distribution network is reduced, and the loop closing operation of the distribution network is safer and more reliable.
According to the management and control method for the distribution network loop closing operation risk, a loop closing point switch corresponding to the distribution network loop closing operation and a power flow section where the loop closing point switch is located are determined in a distribution network loop closing model, the distribution network loop closing operation is simulated by controlling the loop closing point switch, the load and bus voltage of the power flow section are regulated to obtain the operation mode of simulating the distribution network loop closing operation when the distribution network stroke motor group outputs rated power and maximum power, the position of a risk point is determined based on simulation test data obtained by simulating the distribution network loop closing operation mode, loop closing risk association rule bases are formulated according to the simulation test data and the position of the risk point, a loop closing risk evaluation function is formed, the pressure difference of voltages at two ends of the distribution network loop closing point is controlled to be within a preset pressure difference range according to the loop closing risk evaluation function, and the power output by a converter station in the distribution network is controlled to be balanced. Compared with the existing method for controlling the operation risk of the distribution network by checking the phase sequence and the phase of the voltages at two sides of the loop closing point, the control method for the operation risk of the distribution network is used for controlling the operation risk of the distribution network according to the simulation test data and the position of the risk point, can control the pressure difference of the voltages at two ends of the loop closing point of the distribution network to be in a preset pressure difference range, and controls the power output by a converter station in the distribution network to be balanced on site, so that the risk of the operation of the distribution network is further reduced, the operation of the distribution network is safer and more reliable, and the reliability of the control of the operation risk of the distribution network is improved.
Example III
Fig. 4 is a structural block diagram of a management and control device for risk of loop closing operation of a distribution network according to a third embodiment of the present invention, where the management and control device for risk of loop closing operation of a distribution network includes: a data acquisition module 310, a model building module 320, a closed loop simulation module 330, a position determination module 340, and a closed loop control module 350. The data acquisition module 310 is configured to acquire a wiring diagram and line data of the distribution network; the model building module 320 is configured to build a distribution network loop-closing model according to the wiring diagram and the line data of the distribution network; the loop closing simulation module 330 is configured to simulate a loop closing operation mode of the distribution network by adjusting a load of a power flow section and a bus voltage in the distribution network based on the distribution network loop closing model; the position determining module 340 is configured to determine a position of a risk point based on simulation test data obtained by simulating a loop closing operation mode of the distribution network, and formulate a loop closing risk association rule basis according to the simulation test data and the position of the risk point, so as to form a loop closing risk evaluation function; the loop closing control module 350 is configured to determine feasibility of a loop closing operation of the distribution network according to the loop closing risk evaluation function, and control the loop closing operation of the distribution network.
On the basis of the above embodiment, the loop closing simulation module 330 includes a switch determination unit, a switch control unit, and a loop closing simulation unit; the switch determining unit is used for determining a loop closing point switch corresponding to loop closing operation of the distribution network and a power flow section where the loop closing point switch is located in the loop closing model of the distribution network; the switch control unit is used for closing the simulated distribution network loop closing operation by controlling the loop closing point switch; the loop closing simulation unit is used for obtaining the operation mode of the loop closing operation of the distribution network when the wind motor group outputs rated power and maximum power by adjusting the load and bus voltage of the tide section.
In one embodiment, the position determining module 340 includes a current-carrying ratio calculating unit and a data determining unit, where the current-carrying ratio calculating unit is configured to calculate a ratio of a line current to a maximum allowable line current based on a line current of a distribution network obtained by simulating a loop-closing operation mode of the distribution network, so as to obtain a line current-carrying ratio; the data determining unit is used for taking the power, the line current and the line current-carrying ratio of the line transmission of the distribution network obtained based on the analog distribution network loop-closing operation mode as analog test data.
Preferably, the location determining module 340 includes a data checking unit, a risk point determining unit, and a location determining unit; the data checking unit is used for checking the simulation test data obtained in the simulation distribution network loop closing operation process and determining whether risk points exist or not; the risk point determining unit is used for determining that risk points exist if abnormal data exist in the checking simulation test data; the abnormal data are data exceeding a corresponding preset threshold value; the position determining unit is used for taking the position of the abnormal data corresponding to the operation of the distribution network loop as the position of the risk point.
Preferably, the loop closing control module 350 includes a loop closing control unit, which is configured to control a differential pressure of voltages at two ends of a loop closing point of the distribution network to be within a preset differential pressure range according to a loop closing risk evaluation function, and control power output by a converter station in the distribution network to be balanced in situ.
In one embodiment, the management and control device further includes a table generating module, configured to generate a data table of the simulation test data and store the data table.
The management and control device for the operation risk of the distribution network and the management and control method for the operation risk of the distribution network and the ring provided by any embodiment of the present invention belong to the same inventive concept, have corresponding beneficial effects, and are not detailed in the technical details of the embodiment of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A management and control method for the operation risk of a distribution network loop is characterized by comprising the following steps:
acquiring a wiring diagram and line data of a distribution network;
establishing a distribution network loop closing model according to the wiring diagram and the line data of the distribution network;
based on the distribution network loop closing model, a distribution network loop closing operation mode is simulated by adjusting the load of a power flow section in the distribution network and the bus voltage;
determining the position of a risk point based on simulation test data obtained by simulating a distribution network loop closing operation mode, and formulating a loop closing risk association rule basis according to the simulation test data and the position of the risk point to form a loop closing risk evaluation function;
determining the feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function, and controlling the loop closing operation of the distribution network;
based on the distribution network loop closing model, the method for simulating the distribution network loop closing operation by adjusting the load and the bus voltage of the power flow section in the distribution network comprises the following steps:
determining a loop closing point switch corresponding to loop closing operation of the distribution network in the loop closing model of the distribution network, and a power flow section where the loop closing point switch is positioned;
closing the simulated distribution network loop closing operation by controlling the loop closing point switch;
the method comprises the steps of obtaining an operation mode of simulating the loop closing operation of a distribution network when a wind motor group outputs rated power and maximum power by adjusting the load and bus voltage of a tide section;
obtaining simulation test data based on a mode of simulating loop closing operation of a distribution network comprises the following steps:
calculating the ratio of the line current to the maximum allowable line current based on the line current of the distribution network obtained by simulating the loop closing operation mode of the distribution network, and obtaining the line current-carrying ratio;
taking the power, the line current and the line current-carrying ratio of the line transmission of the distribution network, which are obtained based on the mode of simulating the loop closing operation of the distribution network, as simulation test data;
the determining the position of the risk point based on the simulation test data obtained by simulating the distribution network loop closing operation mode comprises the following steps:
checking simulation test data obtained in the process of loop closing operation of the simulation distribution network, and determining whether risk points exist or not;
if abnormal data exist in the simulation test data, determining that risk points exist; the abnormal data are data exceeding a corresponding preset threshold value;
and taking the position of the abnormal data corresponding to the operation of the distribution network loop as the position of the risk point.
2. The method for managing risk of a loop closing operation of a distribution network according to claim 1, wherein determining feasibility of the loop closing operation of the distribution network according to the loop closing risk evaluation function, and controlling the loop closing operation of the distribution network, comprises:
and controlling the pressure difference of the voltages at two ends of the loop closing point of the distribution network to be within a preset pressure difference range according to the loop closing risk evaluation function, and controlling the power output by the converter station in the distribution network to be balanced on site.
3. The method for managing and controlling the risk of loop closing operation of a distribution network according to claim 2, wherein the preset differential pressure range is-0.3 kV to +0.3kV.
4. The method for managing and controlling the risk of the loop closing operation of the distribution network according to claim 2, wherein when the power output by the converter station in the distribution network is balanced in situ and the voltage difference between the voltages at two ends of the loop closing point of the distribution network is within a preset voltage difference range, the circulating power of the ac/dc closed loop of the loop closing operation of the distribution network at the medium voltage side is within a preset circulating power allowable range, and when the circulating power is increased or decreased, the risk of the loop closing operation of the distribution network is correspondingly increased or decreased.
5. The method for controlling risk of loop closing operation of a distribution network according to claim 2, wherein when the voltage difference between the voltages at two ends of the loop closing point of the distribution network is increased or decreased, the risk of loop closing operation of the distribution network is correspondingly increased or decreased.
6. The method for managing risk of a network closing operation according to claim 2, wherein after determining the position of the risk point based on the simulation test data obtained by simulating the network closing operation, further comprises:
and generating a data table of the simulation test data and storing the data table.
7. Control device of joining in marriage net and closing ring operation risk, characterized by, include:
the data acquisition module is used for acquiring wiring diagrams and line data of the distribution network;
the model building module is used for building a distribution network loop-closing model according to the wiring diagram and the line data of the distribution network;
the loop closing simulation module is used for simulating a loop closing operation mode of the distribution network by adjusting the load of a power flow section in the distribution network and the bus voltage based on the loop closing model of the distribution network;
the position determining module is used for determining the position of a risk point based on simulation test data obtained by simulating the loop closing operation mode of the distribution network, and formulating a loop closing risk association rule basis according to the simulation test data and the position of the risk point to form a loop closing risk evaluation function;
the loop closing control module is used for determining the feasibility of loop closing operation of the distribution network according to the loop closing risk evaluation function and controlling the loop closing operation of the distribution network;
the loop closing simulation module comprises a switch determining unit, a switch control unit and a loop closing simulation unit;
the position determining module comprises a current carrying ratio calculating unit, a data determining unit, a data checking unit, a risk point determining unit and a position determining unit.
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| CN106786527A (en) * | 2016-12-21 | 2017-05-31 | 国电南瑞科技股份有限公司 | Based on the distribution network closed loop risk analysis method for saving ground and allotment integration |
| CN108304613A (en) * | 2017-12-26 | 2018-07-20 | 贵州电网有限责任公司 | Closed loop network powered operation methods of risk assessment |
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| CN107038653A (en) * | 2017-04-17 | 2017-08-11 | 国网青海省电力公司 | Cyclization powered operation methods of risk assessment and device |
| CN109066676B (en) * | 2018-10-10 | 2021-06-22 | 云南电网有限责任公司临沧供电局 | Security assessment method for closed loop switching power supply based on SCADA system |
| CN110880765A (en) * | 2019-12-19 | 2020-03-13 | 深圳供电局有限公司 | Power distribution network closed loop operation method and system, closed loop operation equipment and storage medium |
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| CN108304613A (en) * | 2017-12-26 | 2018-07-20 | 贵州电网有限责任公司 | Closed loop network powered operation methods of risk assessment |
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