CN111355244A - Low-frequency low-voltage load reduction implementation evaluation method and device based on structured modeling - Google Patents
Low-frequency low-voltage load reduction implementation evaluation method and device based on structured modeling Download PDFInfo
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Abstract
The invention provides a low-frequency low-voltage load reduction implementation evaluation method and device based on structured modeling, which are characterized in that structured modeling is carried out on a low-frequency low-voltage load reduction strategy, the controllable total amount of each turn of each region of the low-frequency low-voltage load reduction is identified on line according to the actual operation information and the actual power grid operation condition of a low-frequency low-voltage load reduction control device configured in a regional power grid, and the low-frequency low-voltage load reduction implementation evaluation method and device are matched with a structured configuration scheme on line and compared with the control amount, so that the influence of the change of the operation mode of the power grid on the low-frequency low-voltage load reduction control of the power grid can be sensed quickly, and the automation.
Description
Technical Field
The invention relates to the technical field of power system dispatching operation monitoring, in particular to a low-frequency low-voltage load reduction implementation evaluation method and device based on structured modeling.
Background
Frequency stability and voltage stability are two important aspects of power system stability. The low-frequency low-voltage load reduction is used as a third defense line for the safe and stable control of the power system, and plays an extremely important role in ensuring the frequency and voltage stability of the power system. When the frequency is reduced due to the shortage of active power or the voltage is reduced due to the shortage of reactive power in the power grid, part of the load is automatically cut off according to the frequency reduction value or the voltage reduction value, the active power and the reactive power between a system power supply and the load are rebalanced, and the frequency and the voltage are restored to be within an allowable range.
The power dispatching department can make a low-frequency low-voltage load reduction configuration scheme of a regional power grid according to the annual running level of a power system, mainly configures a low-frequency low-voltage load reduction control device through a related plant station, and makes the low-frequency low-voltage load reduction scheme according to a calculation analysis result. The state of the low-frequency low-voltage load reduction control device in the regional power grid, the state of the allowed-cutting pressure plate corresponding to the load line collected by the low-frequency low-voltage load reduction control device, the cutting priority of the load line and the real-time change of the load power in the power grid all influence the final load reduction effect of each turn of low-frequency low-voltage. Currently, the low-frequency low-voltage load reduction data of a part of third defensive lines can be acquired by monitoring the low-frequency low-voltage load reduction control device, for example, the invention name of the Chinese patent: a low-frequency low-voltage self-adaptive accurate load reduction method is disclosed in the application number: 201711006405.6 provides a low-frequency low-voltage self-adaptive accurate load reduction method, which comprises the steps of measuring the total power of the transformer substation and the real-time power of each load line, setting the load reduction systems of each low-frequency low-voltage wheel and the priority grouping fixed value reflecting the importance degree of each load, calculating the load reduction quantity in real time and automatically matching the load reduction.
The invention name of the Chinese invention patent is: the low-frequency load shedding system and method based on the regional power grid panoramic information has the following application numbers: 201610804483.X provides a low-frequency load shedding system and method based on regional power grid panoramic information, which counts low-frequency low-voltage reducible load information in a regional power grid through a low-frequency load shedding master station and a plurality of low-frequency load shedding sub-stations.
However, the above technical solutions cannot perform practical evaluation on the amount of the low-frequency and low-voltage reducible load, and therefore, research on related problems is urgently needed.
Disclosure of Invention
The invention aims to provide a low-frequency low-voltage load reduction implementation evaluation method and device based on structured modeling.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a low-frequency low-voltage load reduction implementation evaluation method based on structured modeling, which comprises the following steps:
determining control measures of the low-frequency low-voltage load reduction control device of each subarea in the regional power grid in a commissioning state according to a structured low-frequency low-voltage load reduction strategy model pre-constructed by the low-frequency low-voltage load reduction control device in the regional power grid;
screening the controllable control measures of the low-frequency low-voltage load reduction control device from the control measures of the low-frequency low-voltage load reduction control device in the commissioning state to obtain a controllable control measure set of each partition;
selecting control measures of low-frequency low-voltage actions in each turn from the controllable control measure sets of each partition, and accumulating to obtain the total controllable load of each low-frequency low-voltage turn of each partition;
and evaluating the implementable state of each low-frequency low-voltage turn of each partition in the regional power grid and the implementable state of each low-frequency low-voltage turn of the regional power grid according to the controllable load total amount of each low-frequency low-voltage turn of each partition in the regional power grid.
Further, the structured low-frequency low-voltage load reduction strategy model pre-constructed by the low-frequency low-voltage load reduction control device includes:
device information, a structured control strategy, control measures and a structured configuration scheme;
the device information comprises device commissioning information, latching information, a fixed value and a pressing plate;
the structured control strategy comprises a strategy type, a zone to which the strategy belongs, a round on-off constraint condition, a monitoring bus, a frequency/voltage range and time delay, a control quantity type, a control quantity formula and an associated control measure set;
the control measures comprise control objects, cutting priorities, action constraint conditions and a belonging control measure set;
the structured configuration scheme comprises subareas, turns, frequency/voltage ranges, time delay and turn control quantity.
Further, the controllable control measures of the screening low-frequency low-pressure reduction load control device comprise:
according to the structured low-frequency low-voltage load reduction strategy model, the action constraint conditions and the removal priorities of each control measure of the low-frequency low-voltage load reduction control device in the commissioning state are checked, the control measures which do not meet the action constraint conditions and the removal priorities of which are 0 are eliminated, the removal priorities of the remaining control measures are calculated and are sorted according to the priority rules, and a controllable control measure set of the low-frequency low-voltage load reduction control device is obtained.
Furthermore, controllable control measure sets of the low-frequency low-voltage load reduction control devices of the partitions in the commissioning state are combined to obtain the controllable control measure sets of the partitions.
Further, the selecting the control measures of each low-frequency and low-voltage action in each turn from the controllable control measure set of each partition and accumulating to obtain the total controllable load of each low-frequency and low-voltage turn of each partition includes:
based on a structured low-frequency low-voltage load reduction strategy model, screening control measures in a controllable control measure set of a single partition according to the frequency/voltage range and the time delay of the 1 st round in a structured configuration scheme to obtain j control measures meeting the action condition of the 1 st round, summing the power of the j control measures to obtain the load reduction total amount of the 1 st round of the partition, removing the j control measures of the 1 st round of action from the controllable control measure set to obtain a new controllable control measure set, repeating the calculation process of the load reduction total amount of the 1 st round, and so on to obtain the controllable load total amounts of the 2 nd round to the x th round;
the action condition is that the frequency/voltage range and the time delay in the structural configuration scheme are completely matched with the frequency/voltage range and the time delay of a certain turn of the low-frequency low-voltage load reduction control device.
Further, the method includes the steps of selecting control measures of each low-frequency and low-voltage action from the controllable control measure sets of each partition and accumulating the control measures to obtain the total controllable load of each low-frequency and low-voltage action of each partition, and further includes:
according to the principle of minimum over-cutting
The limiting condition is that k values in the expression are obtained, namely the number of load shedding operations adopted by the 1 st round of operation of a single partition, the first k control measures are obtained from the controllable control measure set, and the total load shedding amount of the 1 st round of operation of the single partition is obtained by summing the power of the k control measures;
removing k control measures of the 1 st round of action from the controllable control measure set to obtain a new control measure set, repeating the calculation process of the 1 st round of load reduction total amount, and so on to obtain the load reduction total amounts of the 2 nd round to the x th round;
wherein v isc′iAnd v is the total control amount of each appointed round for the power of the load in the ith control measure in the control measure set of the regional power grid.
Further, the evaluating the implementable state of each low-frequency and low-voltage turn of each partition in the regional power grid according to the total amount of the controllable load of each low-frequency and low-voltage turn of each partition in the regional power grid includes:
comparing the total amount Acut1 of the low-frequency low-voltage controllable load of the 1 st wheel of each subarea with the controlled amount Aneed1 of the 1 st wheel in each subarea structured configuration scheme, and if the Acut1< Aneed1 indicates that the implementable state of the 1 st wheel of the subarea is insufficient in controllable load amount, giving an alarm and outputting a specific controlled amount difference Aneed1-Acut 1; otherwise, the 1 st round implementable state of the subarea is enough for controlling the load quantity;
and by analogy, the state evaluation can be implemented by completing each low-frequency low-voltage round of each partition.
Further, evaluating the low-frequency and low-voltage executable states of the regional power grid in each turn comprises the following steps:
accumulating the total low-frequency low-voltage controllable load SUMcut1 of the 1 st wheel of each subarea of the regional power grid and accumulating the controlled quantity SUMneed1 of the 1 st wheel in the structural configuration scheme of each subarea of the regional power grid, and if SUMcut1< SUMneed1 indicates that the controllable load quantity is insufficient in the 1 st wheel implementable state of the regional power grid, alarming and outputting a specific controlled quantity difference SUMneed1-SUMcut 1; otherwise, the implementable state of the 1 st round of the regional power grid is that the controllable load quantity is enough;
and so on, completing the low-frequency and low-voltage rounds of the regional power grid, and performing state evaluation.
In another aspect, an embodiment of the present invention further provides a low-frequency low-voltage load reduction implementation evaluation apparatus based on structural modeling, including:
the acquisition module is used for determining control measures of the low-frequency low-voltage load reduction control devices of all the subareas in the operation state in the regional power grid according to a structured low-frequency low-voltage load reduction strategy model which is constructed in advance by the low-frequency low-voltage load reduction control devices in the regional power grid;
the screening module is used for screening the controllable control measures of the low-frequency low-voltage load reduction control device from the control measures of the low-frequency low-voltage load reduction control device in the commissioning state to obtain a controllable control measure set of each partition;
the calculation module is used for selecting the control measures of the low-frequency low-voltage actions in each turn from the controllable control measure set of each partition and accumulating the control measures to obtain the total controllable load of each turn of the low-frequency low-voltage of each partition;
and the number of the first and second groups,
and the evaluation module is used for evaluating the implementable state of each low-frequency and low-voltage turn of each subarea in the regional power grid and the implementable state of each low-frequency and low-voltage turn of the regional power grid according to the controllable load total amount of each low-frequency and low-voltage turn of each subarea in the regional power grid.
Further, the computing module is specifically configured to,
based on a structured low-frequency low-voltage load reduction strategy model, screening control measures in a controllable control measure set of a single partition according to the frequency/voltage range and the time delay of the 1 st round in a structured configuration scheme to obtain j control measures meeting the action condition of the 1 st round, summing the power of the j control measures to obtain the load reduction total amount of the 1 st round of the partition, removing the j control measures of the 1 st round of action from the controllable control measure set to obtain a new controllable control measure set, repeating the calculation process of the load reduction total amount of the 1 st round, and so on to obtain the controllable load total amounts of the 2 nd round to the x th round;
the action condition is that the frequency/voltage range and the time delay in the structural configuration scheme are completely matched with the frequency/voltage range and the time delay of a certain turn of the low-frequency low-voltage load reduction control device.
Furthermore, the computing module is specifically further configured to,
according to the principle of minimum over-cutting
The limiting condition is that k values in the expression are obtained, namely the number of load shedding operations adopted by the 1 st round of operation of a single partition, the first k control measures are obtained from the controllable control measure set, and the total load shedding amount of the 1 st round of operation of the single partition is obtained by summing the power of the k control measures;
removing k control measures of the 1 st round of action from the controllable control measure set to obtain a new control measure set, repeating the calculation process of the 1 st round of load reduction total amount, and so on to obtain the load reduction total amounts of the 2 nd round to the x th round;
wherein v isc′iAnd v is the total control amount of each appointed round for the power of the load in the ith control measure in the control measure set of the regional power grid.
Further, the evaluation module is specifically configured to,
comparing the total low-frequency low-voltage controllable load amount Acut1 of the 1 st wheel of each subarea with the controlled amount Aneed1 of the 1 st wheel in each subarea structured configuration scheme, and if the Acut1< Aneed1 indicates that the implementable state of the 1 st wheel of each subarea is insufficient in controllable load amount, giving an alarm and outputting a specific controlled amount difference Aneed1-Acut 1; otherwise, the 1 st round implementable state of the subarea is enough for controlling the load quantity;
and so on, completing the low-frequency low-voltage state evaluation of each partition in each round;
and the number of the first and second groups,
accumulating the total low-frequency low-voltage controllable load SUMcut1 of the 1 st wheel of each subarea of the regional power grid and accumulating the controlled load SUMneed1 of the 1 st wheel in the structural configuration scheme of each subarea of the regional power grid, and if SUMcut1< SUMneed1 indicates that the implementable state of the 1 st wheel of the regional power grid is insufficient in controllable load, alarming and outputting a specific controlled load difference SUMneed1-SUMcut 1; otherwise, the implementable state of the 1 st round of the regional power grid is that the controllable load quantity is enough;
and so on, completing the low-frequency and low-voltage rounds of the regional power grid, and performing state evaluation.
The invention achieves the following beneficial effects:
the invention provides a low-frequency low-voltage load reduction strategy implementability evaluation method based on structured modeling, which is characterized in that the low-frequency low-voltage load reduction strategy is modeled, the controllable load total amount of each turn of each region of the low-frequency low-voltage load reduction is identified on line according to the actual operation information of a low-frequency low-voltage load reduction control device configured in a regional power grid and the actual power grid operation condition, and is matched with a regional power grid low-frequency low-voltage load reduction configuration scheme on line and compared with the control amount, so that the influence of the change of the operation mode of the power grid on the low-frequency low-voltage load reduction control of the power grid can be sensed quickly, the automation level of the low-frequency low-voltage load reduction on-line monitoring management is improved, and.
Drawings
FIG. 1 is a flow chart of an embodiment evaluation method of low-frequency low-pressure load reduction based on structural modeling;
FIG. 2 is a structural diagram of a structured low frequency low voltage load shedding strategy model of the present invention;
fig. 3 is a schematic diagram of the low-frequency low-voltage load reduction feasibility assessment workflow of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention.
The invention provides a low-frequency low-voltage load reduction implementation evaluation method based on structured modeling, which comprises the following steps of:
step 1: analyzing the load reduction strategy logic of the low-frequency low-voltage load reduction control device and the load reduction scheme of the regional power grid, and determining the basic elements of the low-frequency low-voltage load reduction strategy, wherein the basic elements are as follows:
because the safety and stability characteristics of different regional power grids are different, the configuration mode of the low-frequency low-voltage load shedding control device is different from the low-frequency low-voltage load shedding scheme of the regional power grids. For example, some power plants deploy low-frequency low-voltage control devices for local load reduction, some power plants achieve load reduction through low-frequency low-voltage load reduction modules in deployed safety automatic control devices, and some line protection devices with low-frequency and low-voltage load reduction functions are controlled according to lines. The low-frequency and low-voltage load reduction schemes of the power networks in different regions can be established according to the characteristics of the respective regions, for example, the low-frequency load reduction of the Ningxia power network is arranged according to six basic wheels and one special wheel, the low-voltage load reduction is arranged according to three basic wheels and one special wheel, and a plurality of special wheels are arranged in some regions.
Factors and control objects related to the low-frequency low-voltage load reduction strategy are complex, and the universality is poor. Comprehensively analyzing control strategies of a large number of actual low-frequency low-voltage load-reducing control devices, and extracting common elements in the load-reducing strategies to obtain the following basic elements: the method comprises the following steps of low-frequency low-voltage load reduction control device attribute, a pressing plate, a fixed value, a load reduction device control strategy and a regional power grid load reduction scheme. The attributes of the low-frequency low-voltage load reduction control device comprise an operation state and a locking state of the device; the pressing plate comprises the on-off state of each functional pressing plate; the fixed value comprises a low-frequency low-voltage load reduction control function switching control word, and the turn or the cutting priority of each control object; the load reduction device control strategy comprises load reduction turns solidified by the device, a monitoring bus, action conditions, control quantity, implementation principles, control objects and action constraint conditions; the load reduction scheme of the regional power grid comprises action conditions and required control quantity of each turn of each partition of the regional power grid.
Step 2: and according to a structured modeling method, establishing a low-frequency low-voltage load reduction strategy model of the power grid of the coverage area.
In order to meet the requirement of structured modeling of the low-frequency low-voltage load reduction strategy, the structured model meeting the requirements of various strategies is defined according to the low-frequency low-voltage load reduction control device attributes, the pressing plates, the fixed values, the load reduction device control strategy and the regional power grid load reduction scheme extracted and modeled elements summarized in the step 1, and the standardized description of the low-frequency low-voltage load reduction strategy is realized.
Referring to fig. 2, in the present invention, the structured low-frequency low-voltage load reduction strategy model includes four parts, namely device information, a structured control strategy, a control measure and a structured configuration scheme. The device information comprises device commissioning information, locking information, a fixed value and a pressing plate; the structured control strategy is composed of a strategy type, a subarea to which the strategy belongs, a round on-off constraint condition, a monitoring bus, a frequency/voltage range and time delay, a control quantity type, a control quantity formula and an associated control measure set. The control measure is composed of a control object, an excision priority, an action constraint condition and an affiliated control measure set. The structural configuration scheme consists of subareas, turns, frequency/voltage ranges, time delay and turn control quantity.
The turn switching constraint conditions, the control quantity formula, the control object action constraint conditions and the control object cutting priority are differentiated in different control devices, and are uniformly described through a formula consisting of a series of keywords, arithmetic operators and relational operators based on the operation condition of primary equipment of the power system and the pressing plate and the fixed value of the device.
The cutting priority in the control measures defines the priority degree of cutting the load, and is defined through an expression; the action constraint condition in the control measure defines the condition whether the current control measure can take effect, and is also defined by an expression.
Taking the scheme of low-frequency low-voltage load reduction strategy configuration of Ningxia power grid as an example:
TABLE 1 regional grid low frequency load shedding strategy configuration scheme
| Number of rounds | Action frequency (Hz) | Action delay(s) | Load to be reduced (MW) |
| Basic wheel 1 wheel | 49.0 | 0.2 | 930 |
| Basic wheel 2 wheel | 48.8 | 0.2 | 930 |
| Basic wheel 3 wheels | 48.6 | 0.2 | 930 |
| Basic wheel 4 wheels | 48.4 | 0.2 | 930 |
| Basic wheel 5 wheels | 48.2 | 0.2 | 930 |
| Basic wheel 6 wheels | 48.0 | 0.2 | 930 |
| Special wheel | 49.0 | 10 | 530 |
TABLE 2 regional grid Low Voltage load shedding strategy configuration scheme
| Number of rounds | Operating voltage (Un) | Action delay(s) | Load to be reduced (MW) |
| Basic wheel 1 wheel | 0.85 | 1 | 1050 |
| Basic wheel 2 wheel | 0.80 | 1 | 1050 |
| Basic wheel 3 wheels | 0.75 | 1 | 1050 |
| Special wheel | 0.85 | 20 | 420 |
TABLE 3 keywords
TABLE 4 logical operators
| Serial number | Attribute name | Attribute English name | Description of the invention |
| 1. | Is greater than | > | Relational operators |
| 2. | Is less than | < | Relational operators |
| 3. | Is greater than or equal to | >＝ | Relational operators |
| 4. | Is less than or equal to | <＝ | Relational operators |
| 5. | Is equal to | ＝＝ | Relational operators |
| 6. | Is not equal to | ！＝ | Relational operators |
| 7. | Adding | + | Arithmetic operator |
| 8. | Reducing | - | Arithmetic operator |
| 9. | Riding device | * | Arithmetic operator |
| 10. | Removing device | / | Arithmetic operator |
Taking the Ningxia power grid low-frequency load-shedding strategy as an example, the load reduction of each turn of each subarea in the regional power grids such as Shizui mountain, Yinchuan and Wuzhou needs to be monitored, simultaneously, the loads of all the electrolytic aluminum plant stations also need to be monitored, the loads of all the subareas and the loads of the electrolytic aluminum plant stations are gathered and counted when the load-shedding state of the whole grid is inspected, the monitoring mode of the subareas and the plant stations can set all the electrolytic aluminum plant stations as a virtual subarea during modeling, and a similar configuration scheme is adopted in other actual regions such as the Shizui mountain. The load of the electrolytic aluminum plant station comprises the load of each plant of the brocade aluminum, the aluminum third plant, the michael first period and the michael second period, and the load of each plant has different requirements in the cutting round, for example, the electrolytic aluminum load of the brocade aluminum plant is only allowed to be cut in the 3 rd round of the basic round, the constraint condition of the load measure of the brocade aluminum plant can be defined by the formula of cutturn () -3 during modeling, and the measure is effective when the current round is the 3 rd round of the basic round.
And step 3: and calculating the implementable state and the total implementable state of each low-frequency low-voltage wheel of each subarea of the regional power grid based on the structured low-frequency low-voltage load reduction strategy model. The specific implementation process is shown in fig. 3, and comprises the following steps:
step 3-1: counting low-frequency low-voltage load reduction control devices in a commissioning state in a single partition of a regional power grid, and identifying control measures in a controllable state in each device;
the control measures of the low-frequency low-pressure load reducing device in the single commissioning state (running, unlocked and low-frequency low-pressure functional pressure plate is put into operation) are as follows: ca ═ Ca1, Ca2, Ca3 … Can.
The control object of each control measure corresponds to 1 load which can be reduced when the device detects low frequency and low pressure;
and (3) checking the action constraint conditions and the resection priorities of each control measure Ca 1-Can in the set Ca, eliminating the control measures which do not meet the action constraint conditions and have the resection priorities of 0, calculating the resection priorities of the rest control measures and sequencing according to a priority rule to obtain a controllable control measure set C ' a which is { C ' a1, C ' a2 and C ' a3 … C ' am }, m < n, wherein the control measures which are preferentially adopted are arranged in front.
Counting all low-frequency low-voltage load reduction control devices in a commissioning state in a single partition in the regional power grid according to the steps, and combining the controllable control measure sets of all the devices to obtain a control measure set of the partition: c ═ { C '1, C'2, C '3 … C's }.
Step 3-2: determining a control measure set of each action of each partition structured configuration scheme of the regional power grid according to a control quantity implementation rule, and accumulating to obtain the total controllable load;
the method is divided into two calculation methods according to different control quantity implementation rules.
(a) The control measures directly specify the round principle: screening the control measures in a single partition control measure set C 'according to the frequency/voltage range and the time delay of the 1 st round in the structural configuration scheme to obtain j control measures meeting the action condition of the 1 st round (the frequency/voltage range and the time delay in the structural configuration scheme are matched with the frequency/voltage range and the time delay of a certain round of the low-frequency low-voltage load reduction control device in a complete zone), summing the power of the j control measures to obtain the load reduction total amount Acut1 of the 1 st round of the partition of the regional power grid, removing the j control measures of the 1 st round of action from the set C' to obtain a new control measure set, repeating the calculation process of the load reduction total amount of the 1 st round, and so on to obtain the load reduction total amounts of the 2 nd round to the x round.
(b) And (3) specifying a total control amount principle of each round:
assuming that the total amount of the 1 st round of control is v, according to the principle of minimum over-cut
A limiting condition wherein vc′iAnd for the power of the load in the ith control measure in the measure set C ', calculating a value k in an expression, namely the number of the load shedding adopted by the 1 st round of action of a single partition of the regional power grid, acquiring the previous k control measures from the set C', and summing the power of the k control measures to obtain the total load shedding Acut1 of the 1 st round of the regional power grid. And (4) removing k control measures of the 1 st round of action from the set C' to obtain a new control measure set, repeating the calculation process of the 1 st round of load reduction total amount, and so on to obtain the load reduction total amounts of the 2 nd round to the x th round.
Step 3-3: calculating the implementable state of each low-frequency low-voltage round of each subarea according to the structural configuration scheme and the controllable load total amount (load reduction total amount) of each low-frequency low-voltage round of each subarea, and giving an alarm and outputting a specific control amount difference value if the low-frequency low-voltage controllable load total amount of a certain round of the subarea is less than the required control amount of the corresponding round in the structural configuration scheme;
comparing the total load-reducible amount Acut1 of the 1 st wheel of the subarea A with the controlled amount Aneed1 of the 1 st wheel in the structural configuration scheme, and if the Acut1< Aneed1 indicates that the implementable state of the 1 st wheel of the subarea is insufficient in controllable load amount, alarming and outputting a specific controlled amount difference Aneed1-Acut 1; otherwise, the 1 st wheel implementable state of the subarea is that the controllable load capacity is enough, and the load reduction requirement of the third defense line is met. By analogy, statistics of the implementable states of the 2 nd round to the x th round can be completed. And repeating the steps to obtain the implementable states of all the subareas in each turn.
Step 3-4: and accumulating the total controllable load of each turn of the regional power grid aiming at the total controllable load of each turn of all the subareas of the regional power grid, and calculating the implementable state of each turn of the low-frequency low-voltage regional power grid.
Accumulating the total reducible load quantity SUMcut1 of the 1 st wheel of each subarea of the regional power grid and accumulating the required control quantity SUMneed1 of the 1 st wheel in the structured configuration scheme of each subarea, and if SUMcut1< SUMneed1 indicates that the implementable state of the 1 st wheel of the regional power grid is insufficient in controllable load quantity, giving an alarm and outputting a specific control quantity difference SUMneed1-SUMcut 1; and conversely, the 1 st round implementable state of the regional power grid is enough for the controllable load capacity. And the like, the implementable state of each turn of the regional power grid from the 2 nd to the x th turns can be completed.
In another aspect, an embodiment of the present invention further provides a low-frequency low-voltage load reduction implementation evaluation apparatus based on structural modeling, including:
the acquisition module is used for determining control measures of the low-frequency low-voltage load reduction control devices of all the subareas in the operation state in the regional power grid according to a structured low-frequency low-voltage load reduction strategy model which is constructed in advance by the low-frequency low-voltage load reduction control devices in the regional power grid;
the screening module is used for screening the controllable control measures of the low-frequency low-voltage load reduction control device from the control measures of the low-frequency low-voltage load reduction control device in the commissioning state to obtain a controllable control measure set of each partition;
the calculation module is used for selecting the control measures of the low-frequency low-voltage actions in each turn from the controllable control measure set of each partition and accumulating the control measures to obtain the total controllable load of each turn of the low-frequency low-voltage of each partition;
and the number of the first and second groups,
and the evaluation module is used for evaluating the implementable state of each low-frequency and low-voltage turn of each subarea in the regional power grid and the implementable state of each low-frequency and low-voltage turn of the regional power grid according to the controllable load total amount of each low-frequency and low-voltage turn of each subarea in the regional power grid.
Further, the computing module is specifically configured to,
based on a structured low-frequency low-voltage load reduction strategy model, screening control measures in a controllable control measure set of a single partition according to the frequency/voltage range and the time delay of the 1 st round in a structured configuration scheme to obtain j control measures meeting the action condition of the 1 st round, summing the power of the j control measures to obtain the load reduction total amount of the 1 st round of the partition, removing the j control measures of the 1 st round of action from the controllable control measure set to obtain a new controllable control measure set, repeating the calculation process of the load reduction total amount of the 1 st round, and so on to obtain the controllable load total amounts of the 2 nd round to the x th round;
the action condition is that the frequency/voltage range and the time delay in the structural configuration scheme are completely matched with the frequency/voltage range and the time delay of a certain turn of the low-frequency low-voltage load reduction control device.
Furthermore, the computing module is specifically further configured to,
according to the principle of minimum over-cutting
The limiting condition is that k value in the expression is obtained, namely the load reduction number adopted by the 1 st round of action of a single partition, the first k control measures are obtained from the controllable control measure set, and the power of the k control measures is carried outThe total line addition is carried out to obtain the total load reduction amount of the 1 st round of the single partition;
removing k control measures of the 1 st round of action from the controllable control measure set to obtain a new control measure set, repeating the calculation process of the 1 st round of load reduction total amount, and so on to obtain the load reduction total amounts of the 2 nd round to the x th round;
wherein v isc′iAnd v is the total control amount of each appointed round for the power of the load in the ith control measure in the control measure set of the regional power grid.
Further, the evaluation module is specifically configured to,
comparing the total low-frequency low-voltage controllable load amount Acut1 of the 1 st wheel of each subarea with the controlled amount Aneed1 of the 1 st wheel in each subarea structured configuration scheme, and if the Acut1< Aneed1 indicates that the implementable state of the 1 st wheel of each subarea is insufficient in controllable load amount, giving an alarm and outputting a specific controlled amount difference Aneed1-Acut 1; otherwise, the 1 st round implementable state of the subarea is enough for controlling the load quantity;
and so on, completing the low-frequency low-voltage state evaluation of each partition in each round;
and the number of the first and second groups,
accumulating the total low-frequency low-voltage controllable load SUMcut1 of the 1 st wheel of each subarea of the regional power grid and accumulating the controlled load SUMneed1 of the 1 st wheel in the structural configuration scheme of each subarea of the regional power grid, and if SUMcut1< SUMneed1 indicates that the implementable state of the 1 st wheel of the regional power grid is insufficient in controllable load, alarming and outputting a specific controlled load difference SUMneed1-SUMcut 1; otherwise, the implementable state of the 1 st round of the regional power grid is that the controllable load quantity is enough;
and so on, completing the low-frequency and low-voltage rounds of the regional power grid, and performing state evaluation.
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 (12)
1. A low-frequency low-voltage load reduction implementation evaluation method based on structural modeling is characterized by comprising the following steps:
determining control measures of the low-frequency low-voltage load reduction control device of each subarea in the regional power grid in a commissioning state according to a structured low-frequency low-voltage load reduction strategy model pre-constructed by the low-frequency low-voltage load reduction control device in the regional power grid;
screening the controllable control measures of the low-frequency low-voltage load reduction control device from the control measures of the low-frequency low-voltage load reduction control device in the commissioning state to obtain a controllable control measure set of each partition;
selecting control measures of low-frequency low-voltage actions in each turn from the controllable control measure sets of each partition, and accumulating to obtain the total controllable load of each low-frequency low-voltage turn of each partition;
and evaluating the implementable state of each low-frequency low-voltage turn of each partition in the regional power grid and the implementable state of each low-frequency low-voltage turn of the regional power grid according to the controllable load total amount of each low-frequency low-voltage turn of each partition in the regional power grid.
2. The low-frequency low-voltage load reduction implementation evaluation method based on the structural modeling as claimed in claim 1, wherein the low-frequency low-voltage load reduction control device is a pre-constructed structural low-frequency low-voltage load reduction strategy model, and comprises:
device information, a structured control strategy, control measures and a structured configuration scheme;
the device information comprises device commissioning information, latching information, a fixed value and a pressing plate;
the structured control strategy comprises a strategy type, a zone to which the strategy belongs, a round on-off constraint condition, a monitoring bus, a frequency/voltage range and time delay, a control quantity type, a control quantity formula and an associated control measure set;
the control measures comprise control objects, cutting priorities, action constraint conditions and a belonging control measure set;
the structured configuration scheme comprises subareas, turns, frequency/voltage ranges, time delay and turn control quantity.
3. The structural modeling based low-frequency low-pressure reduction load implementation assessment method according to claim 2, wherein the screening of the controllable control measures of the low-frequency low-pressure reduction load control device comprises:
according to the structured low-frequency low-voltage load reduction strategy model, the action constraint conditions and the removal priorities of each control measure of the low-frequency low-voltage load reduction control device in the commissioning state are checked, the control measures which do not meet the action constraint conditions and the removal priorities of which are 0 are eliminated, the removal priorities of the remaining control measures are calculated and are sorted according to the priority rules, and a controllable control measure set of the low-frequency low-voltage load reduction control device is obtained.
4. The structural modeling based low-frequency low-voltage load reduction implementation evaluation method according to claim 3, wherein the controllable control measure sets of the low-frequency low-voltage load reduction control devices in the commissioning state of each partition are combined to obtain the controllable control measure set of each partition.
5. The method as claimed in claim 2, wherein the selecting the control measures of the low-frequency and low-voltage operation in each turn from the controllable control measure sets of the partitions and accumulating the control measures to obtain the total controllable load of each turn of the low-frequency and low-voltage of each partition comprises:
based on a structured low-frequency low-voltage load reduction strategy model, screening control measures in a controllable control measure set of a single partition according to the frequency/voltage range and the time delay of the 1 st round in a structured configuration scheme to obtain j control measures meeting the action condition of the 1 st round, summing the power of the j control measures to obtain the load reduction total amount of the 1 st round of the partition, removing the j control measures of the 1 st round of action from the controllable control measure set to obtain a new controllable control measure set, repeating the calculation process of the load reduction total amount of the 1 st round, and so on to obtain the controllable load total amounts of the 2 nd round to the x th round;
the action condition is that the frequency/voltage range and the time delay in the structural configuration scheme are completely matched with the frequency/voltage range and the time delay of a certain turn of the low-frequency low-voltage load reduction control device.
6. The method as claimed in claim 2, wherein the method for evaluating the low-frequency low-voltage load reduction performance based on the structured modeling is characterized in that the method selects the control measures of the low-frequency low-voltage operation in each turn from the controllable control measure sets of the partitions and adds the control measures to obtain the total controllable load of each turn of the low-frequency low-voltage of each partition, and further comprises:
according to the principle of minimum over-cutting
The limiting condition is that k values in the expression are obtained, namely the number of load shedding operations adopted by the 1 st round of operation of a single partition, the first k control measures are obtained from the controllable control measure set, and the total load shedding amount of the 1 st round of operation of the single partition is obtained by summing the power of the k control measures;
removing k control measures of the 1 st round of action from the controllable control measure set to obtain a new control measure set, repeating the calculation process of the 1 st round of load reduction total amount, and so on to obtain the load reduction total amounts of the 2 nd round to the x th round;
wherein v isc′iAnd v is the total control amount of each appointed round for the power of the load in the ith control measure in the control measure set of the regional power grid.
7. The structural modeling-based low-frequency low-voltage load shedding implementability assessment method according to claim 2, wherein the assessment of the low-frequency low-voltage each-turn implementable state of each partition in the regional power grid according to the low-frequency low-voltage each-turn controllable load total amount of each partition in the regional power grid comprises:
comparing the total amount Acut1 of the low-frequency low-voltage controllable load of the 1 st wheel of each subarea with the controlled amount Aneed1 of the 1 st wheel in each subarea structured configuration scheme, and if the Acut1< Aneed1 indicates that the implementable state of the 1 st wheel of the subarea is insufficient in controllable load amount, giving an alarm and outputting a specific controlled amount difference Aneed1-Acut 1; otherwise, the 1 st round implementable state of the subarea is enough for controlling the load quantity;
and by analogy, the state evaluation can be implemented by completing each low-frequency low-voltage round of each partition.
8. The structural modeling based low-frequency low-voltage load shedding implementability assessment method according to claim 2, wherein the assessment of low-frequency low-voltage executable state of the regional power grid in each turn comprises:
accumulating the total low-frequency low-voltage controllable load SUMcut1 of the 1 st wheel of each subarea of the regional power grid and accumulating the controlled quantity SUMneed1 of the 1 st wheel in the structural configuration scheme of each subarea of the regional power grid, and if SUMcut1< SUMneed1 indicates that the controllable load quantity is insufficient in the 1 st wheel implementable state of the regional power grid, alarming and outputting a specific controlled quantity difference SUMneed1-SUMcut 1; otherwise, the implementable state of the 1 st round of the regional power grid is that the controllable load quantity is enough;
and so on, completing the low-frequency and low-voltage rounds of the regional power grid, and performing state evaluation.
9. A low-frequency low-voltage load reduction implementation evaluation device based on structural modeling is characterized by comprising:
the acquisition module is used for determining control measures of the low-frequency low-voltage load reduction control devices of all the subareas in the operation state in the regional power grid according to a structured low-frequency low-voltage load reduction strategy model which is constructed in advance by the low-frequency low-voltage load reduction control devices in the regional power grid;
the screening module is used for screening the controllable control measures of the low-frequency low-voltage load reduction control device from the control measures of the low-frequency low-voltage load reduction control device in the commissioning state to obtain a controllable control measure set of each partition;
the calculation module is used for selecting the control measures of the low-frequency low-voltage actions in each turn from the controllable control measure set of each partition and accumulating the control measures to obtain the total controllable load of each turn of the low-frequency low-voltage of each partition;
and the number of the first and second groups,
and the evaluation module is used for evaluating the implementable state of each low-frequency and low-voltage turn of each subarea in the regional power grid and the implementable state of each low-frequency and low-voltage turn of the regional power grid according to the controllable load total amount of each low-frequency and low-voltage turn of each subarea in the regional power grid.
10. The structural modeling based low frequency low pressure reduction load implementation assessment device according to claim 9, wherein said calculation module is specifically configured to,
based on a structured low-frequency low-voltage load reduction strategy model, screening control measures in a controllable control measure set of a single partition according to the frequency/voltage range and the time delay of the 1 st round in a structured configuration scheme to obtain j control measures meeting the action condition of the 1 st round, summing the power of the j control measures to obtain the load reduction total amount of the 1 st round of the partition, removing the j control measures of the 1 st round of action from the controllable control measure set to obtain a new controllable control measure set, repeating the calculation process of the load reduction total amount of the 1 st round, and so on to obtain the controllable load total amounts of the 2 nd round to the x th round;
the action condition is that the frequency/voltage range and the time delay in the structural configuration scheme are completely matched with the frequency/voltage range and the time delay of a certain turn of the low-frequency low-voltage load reduction control device.
11. The structural modeling based low frequency low pressure reduction load implementation assessment device according to claim 9, wherein said calculation module is further specifically configured to,
according to the principle of minimum over-cutting
The limiting condition is that k values in the expression are obtained, namely the number of load shedding operations adopted by the 1 st round of operation of a single partition, the first k control measures are obtained from the controllable control measure set, and the total load shedding amount of the 1 st round of operation of the single partition is obtained by summing the power of the k control measures;
removing k control measures of the 1 st round of action from the controllable control measure set to obtain a new control measure set, repeating the calculation process of the 1 st round of load reduction total amount, and so on to obtain the load reduction total amounts of the 2 nd round to the x th round;
wherein v isc′iAnd v is the total control amount of each appointed round for the power of the load in the ith control measure in the control measure set of the regional power grid.
12. The structural modeling based low frequency low pressure reduction load implementation assessment device according to claim 9, wherein said assessment module is specifically configured to,
comparing the total low-frequency low-voltage controllable load amount Acut1 of the 1 st wheel of each subarea with the controlled amount Aneed1 of the 1 st wheel in each subarea structured configuration scheme, and if the Acut1< Aneed1 indicates that the implementable state of the 1 st wheel of each subarea is insufficient in controllable load amount, giving an alarm and outputting a specific controlled amount difference Aneed1-Acut 1; otherwise, the 1 st round implementable state of the subarea is enough for controlling the load quantity;
and so on, completing the low-frequency low-voltage state evaluation of each partition in each round;
and the number of the first and second groups,
accumulating the total low-frequency low-voltage controllable load SUMcut1 of the 1 st wheel of each subarea of the regional power grid and accumulating the controlled load SUMneed1 of the 1 st wheel in the structural configuration scheme of each subarea of the regional power grid, and if SUMcut1< SUMneed1 indicates that the implementable state of the 1 st wheel of the regional power grid is insufficient in controllable load, alarming and outputting a specific controlled load difference SUMneed1-SUMcut 1; otherwise, the implementable state of the 1 st round of the regional power grid is that the controllable load quantity is enough;
and so on, completing the low-frequency and low-voltage rounds of the regional power grid, and performing state evaluation.
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