CN117977620A - Alternating unbalanced reactive compensation control system and method - Google Patents
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Abstract
The invention relates to an alternating unbalanced reactive compensation control system and a method, wherein the alternating unbalanced reactive compensation control system comprises a main controller module, a plurality of sub-compensation switching units, a plurality of co-compensation switching units, a plurality of sub-compensation power capacitors and a plurality of co-compensation power capacitors, wherein the plurality of sub-compensation/co-compensation switching units are in one-to-one correspondence with the plurality of sub-compensation/co-compensation power capacitors, and each sub-compensation/co-compensation power capacitor is connected into a main bus through the corresponding sub-compensation/co-compensation switching unit; the main controller module samples and calculates the operation data of the power grid, outputs level control signals according to the calculated three-phase data of the power grid to respectively control the co-compensation and the sub-compensation switching units, and records the switching state of each power capacitor; the co-compensation/sub-compensation switching unit receives a level control signal of the main controller module and controls the input or the cutting of the corresponding co-compensation/sub-compensation power capacitor according to the high level and the low level of the level control signal; the co-compensation and the sub-compensation power capacitors both compensate reactive power when put into operation and provide reactive current.
Description
Technical Field
The invention relates to the technical field of electric energy quality, in particular to an alternating unbalanced reactive compensation control system and method, which are mainly applied to the field of low-voltage passive reactive compensation control and ensure the compensation efficiency of a system compensation power capacitor and the reactive balance of the system.
Background
The current reactive compensation controller can control switching of co-compensation and sub-compensation simultaneously, reactive compensation in the conventional occasion can be met, reactive compensation efficiency can be greatly reduced in the occasion that three phases are seriously unbalanced and three phases are alternately unbalanced, and when all sub-compensation capacities cannot meet the capacity required by reactive power of a system, all sub-compensation can be finally put into the system, and the co-compensation cannot be put into a plurality of ways, so that the power factor of the system cannot be improved in place, and the compensation efficiency is low.
Disclosure of Invention
The invention provides an alternating unbalanced reactive compensation control system and method aiming at the problems and the defects existing in the prior art.
The invention solves the technical problems by the following technical proposal:
The invention provides an alternating unbalanced reactive compensation control system which is characterized by comprising a main controller module, a plurality of sub-compensation switching units, a plurality of common-compensation switching units, a plurality of sub-compensation power capacitors and a plurality of common-compensation power capacitors, wherein the plurality of sub-compensation switching units are in one-to-one correspondence with the plurality of sub-compensation power capacitors, the plurality of common-compensation switching units are in one-to-one correspondence with the plurality of common-compensation power capacitors, each sub-compensation power capacitor is connected with a main bus through the corresponding sub-compensation switching unit, each common-compensation power capacitor is connected with the main controller module through the corresponding common-compensation switching unit, each sub-compensation switching unit and the common-compensation switching unit are electrically connected with the main controller module, and the main controller module stores the corresponding relation between the common-compensation switching units and the common-compensation power capacitors and the reactive power of the common-compensation power capacitors and also stores the corresponding relation between the sub-compensation switching units and the sub-compensation power capacitors and the reactive power of the sub-compensation power capacitors;
The main controller module is used for sampling and calculating operation data of the power grid on the main bus, outputting level control signals according to the calculated three-phase data of the power grid to respectively and powerlessly control the co-compensation switching unit and the sub-compensation switching unit, and recording switching states of all power capacitors;
The co-compensation switching unit is used for receiving the level control signal of the main controller module and controlling the input or the cutting of the corresponding co-compensation power capacitor according to the high level and the low level of the level control signal;
the sub-compensation switching unit is used for receiving the level control signal of the main controller module and controlling the input or the cutting of the corresponding sub-compensation power capacitor according to the high level and the low level of the level control signal;
the co-compensation power capacitor and the sub-compensation power capacitor are used for compensating reactive power when the power-on and providing reactive current.
The specific alternating unbalanced reactive compensation control process comprises the following steps: the main controller module is used for sampling the current operation data of the power grid and calculating the three-phase operation active power, reactive power and power factor;
the main controller module is used for calculating a phase A sub-compensation reactive power demand Qa based on the running active power, reactive power and power factor of the phase A, calculating a phase B sub-compensation reactive power demand Qb based on the running active power, reactive power and power factor of the phase B, calculating a phase C sub-compensation reactive power demand Qc based on the running active power, reactive power and power factor of the phase C, taking min (Qa, qb, qc) as the minimum reactive power demand Qmin, wherein the sub-compensation reactive power demand refers to reactive power which is worse from the power factor to the target power factor before each equivalent;
The main controller module is used for calculating three-phase co-compensation reactive power demand according to Qmin x 3, when the three-phase co-compensation reactive power demand is zero, the co-compensation is not needed, when the three-phase co-compensation reactive power demand is non-zero, whether reactive power of a co-compensation power capacitor which is not input currently exists reactive power/reactive power accumulation combination which is close to the three-phase co-compensation reactive power demand and is smaller than or equal to the three-phase co-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is positive, a high-level control signal is sent to a co-compensation switching unit corresponding to a co-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding co-compensation switching unit inputs the corresponding co-compensation power capacitor, and the switching state of the main compensation power capacitor is recorded, and when the reactive power is negative, the reactive power/reactive power accumulation combination cannot be input;
The main controller module is used for sampling current operation data calculation of the power grid again at a fixed time interval after the co-compensation switching, and when the co-compensation is not needed to be put into or can not be put into, the switching of the sub-compensation is independently judged according to the reactive demand Qa of the sub-compensation A phase, the reactive demand Qb of the sub-compensation B phase and the reactive demand Qc of the sub-compensation C phase respectively:
When the A-phase sub-compensation reactive power demand quantity Qa is zero, the A-phase sub-compensation is not needed to be input, when the A-phase sub-compensation reactive power demand quantity Qa is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the A-phase sub-compensation reactive power demand quantity and is smaller than or equal to the A-phase sub-compensation reactive power demand quantity is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit inputs the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power demand quantity is not equal to the A-phase sub-compensation cannot be input;
When the B-phase sub-compensation reactive power demand Qb is zero, judging whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor which is close to the B-phase sub-compensation reactive power demand and smaller than or equal to the reactive power/reactive power accumulation combination of the B-phase sub-compensation reactive power demand or not, if so, sending a high-level control signal to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, switching the corresponding sub-compensation power capacitor by the corresponding sub-compensation switching unit, recording the switching state of the sub-compensation power capacitor, and if not, failing to switch the B-phase sub-compensation;
When the C-phase sub-compensation reactive power demand Qc is zero, the C-phase sub-compensation is not needed to be input, when the C-phase sub-compensation reactive power demand Qc is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the C-phase sub-compensation reactive power demand and is smaller than or equal to the C-phase sub-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit is used for inputting the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power/reactive power demand is not input by the C-phase sub-compensation;
The main controller module is used for sampling current operation data calculation of the power grid again in the fixed time period after the phase A, the phase B or the phase C is subjected to partial compensation switching, when three-phase partial compensation cannot be switched in, the reactive power of the corresponding partial compensation power capacitor which is already switched in by the phase A, the reactive power of the corresponding partial compensation power capacitor which is already switched in by the phase B and the reactive power of the corresponding partial compensation power capacitor which is already switched in by the phase C are combined and accumulated to obtain a reactive power accumulation sum, the reactive power accumulation sum is compared with the reactive power of the corresponding co-compensation power capacitor which is not already switched in by the phase A, when the reactive power accumulation sum is close to and smaller than the reactive power of the corresponding co-compensation power capacitor which is not already switched in by the phase A, a low-level control signal is sent to the corresponding partial compensation switching unit of the reactive power accumulation sum, the corresponding partial compensation power capacitor is cut off, the switching state of the corresponding partial compensation power capacitor is recorded, the high-level control signal is sent to the corresponding co-compensation switching unit of the co-compensation power capacitor is cut off, and the co-compensation capacitor is switched in the state.
The embodiment also provides an alternate unbalanced reactive compensation control method, which is characterized by being implemented by the alternate unbalanced reactive compensation control system, and comprising the following steps of:
step one, the main controller module samples the current operation data of the power grid and calculates the operation active power, reactive power and power factor of three phases;
Step two, the main controller module calculates an A-phase sub-compensation reactive power demand Qa based on the A-phase running active power, reactive power and power factor, calculates a B-phase sub-compensation reactive power demand Qb based on the B-phase running active power, reactive power and power factor, calculates a C-phase sub-compensation reactive power demand Qc based on the C-phase running active power, reactive power and power factor, and takes min (Qa, qb, qc) as a minimum reactive power demand Qmin, wherein the sub-compensation reactive power demand refers to reactive power which is worse from a power factor to a target power factor before each sub-compensation reactive power demand;
Step three, the main controller module calculates three-phase co-compensation reactive power demand according to Qmin 3, when the three-phase co-compensation reactive power demand is zero, co-compensation is not needed, when the three-phase co-compensation reactive power demand is non-zero, judging whether reactive power of a co-compensation power capacitor which is not input currently exists reactive power/reactive power accumulation combination which is close to the three-phase co-compensation reactive power demand and is smaller than or equal to the three-phase co-compensation reactive power demand, when the reactive power/reactive power accumulation combination is zero, sending a high-level control signal to a co-compensation switching unit corresponding to a co-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, and the corresponding co-compensation switching unit inputs the corresponding co-compensation power capacitor, and records the switching state of a main compensation power capacitor, and when the reactive power is not input, the co-compensation cannot be input;
Step four, the main controller module samples the current operation data calculation of the power grid again at a fixed time interval after the co-compensation switching, and when the co-compensation is not needed to be put into or can not be put into, the switching of the sub-compensation is independently judged according to the reactive power demand Qa of the sub-compensation A phase, the reactive power demand Qb of the sub-compensation B phase and the reactive power demand Qc of the sub-compensation C phase respectively:
When the A-phase sub-compensation reactive power demand quantity Qa is zero, the A-phase sub-compensation is not needed to be input, when the A-phase sub-compensation reactive power demand quantity Qa is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the A-phase sub-compensation reactive power demand quantity and is smaller than or equal to the A-phase sub-compensation reactive power demand quantity is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit inputs the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power demand quantity is not equal to the A-phase sub-compensation cannot be input;
When the B-phase sub-compensation reactive power demand Qb is zero, judging whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor which is close to the B-phase sub-compensation reactive power demand and smaller than or equal to the reactive power/reactive power accumulation combination of the B-phase sub-compensation reactive power demand or not, if so, sending a high-level control signal to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, switching the corresponding sub-compensation power capacitor by the corresponding sub-compensation switching unit, recording the switching state of the sub-compensation power capacitor, and if not, failing to switch the B-phase sub-compensation;
When the C-phase sub-compensation reactive power demand Qc is zero, the C-phase sub-compensation is not needed to be input, when the C-phase sub-compensation reactive power demand Qc is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the C-phase sub-compensation reactive power demand and is smaller than or equal to the C-phase sub-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit is used for inputting the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power/reactive power demand is not input by the C-phase sub-compensation;
and fifthly, the main controller module re-samples the current operation data calculation of the power grid in the fixed time period after the phase A, the phase B or the phase C is subjected to sub-switching, when the three-phase sub-switching cannot be performed, the reactive power of the corresponding sub-switching power capacitor is subjected to the phase A, the reactive power of the corresponding sub-switching power capacitor is subjected to the phase B, the reactive power of the same reactive power in the reactive power of the corresponding sub-switching power capacitor is subjected to the phase C, the reactive power sum is obtained by combining and accumulating the reactive powers, the reactive power sum is compared with the reactive power of the corresponding co-switching power capacitor which is not subjected to the phase C, when the reactive power sum is close to and smaller than the reactive power of the corresponding co-switching power capacitor, a low-level control signal is sent to the sub-switching unit corresponding to the reactive power sum, the corresponding sub-switching power capacitor is cut off, the switching state of the corresponding sub-switching power capacitor is recorded, and the high-level control signal is sent to the corresponding co-switching power unit, and the co-switching capacitor is subjected to the co-switching power state of the corresponding co-switching power capacitor.
The invention has the positive progress effects that:
the invention can effectively improve the utilization rate of the compensation capacitor of reactive compensation under the occasion of three-phase alternate unbalance, and can better lead the system to reach the target power factor.
Drawings
Fig. 1 is a schematic structural diagram of an alternate unbalanced reactive compensation control system according to a preferred embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present embodiment provides an alternating unbalanced reactive compensation control system, which includes a main controller module, a plurality of sub-compensation switching units, a plurality of co-compensation switching units, a plurality of sub-compensation power capacitors and a plurality of co-compensation power capacitors, wherein the plurality of sub-compensation switching units are in one-to-one correspondence with the plurality of sub-compensation power capacitors, the plurality of co-compensation switching units are in one-to-one correspondence with the plurality of co-compensation power capacitors, each sub-compensation power capacitor is connected to a main bus through the corresponding sub-compensation switching unit, each co-compensation power capacitor is connected to the main bus through the corresponding co-compensation switching unit, each sub-compensation switching unit and the co-compensation switching unit are electrically connected with the main controller module, and the main controller module stores the corresponding relationship between the co-compensation switching units and the co-compensation power capacitors and the reactive power of the co-compensation power capacitors, and also stores the corresponding relationship between the sub-compensation switching units and the reactive power of the sub-compensation power capacitors.
The main controller module is used for sampling and calculating operation data of the power grid on the main bus, outputting level control signals according to the calculated three-phase data of the power grid to respectively and powerlessly control the co-compensation switching unit and the sub-compensation switching unit, and recording switching states of all power capacitors.
The common-compensation switching unit is used for receiving the level control signal of the main controller module and controlling the input or the cutting of the corresponding common-compensation power capacitor according to the high level and the low level of the level control signal.
The sub-compensation switching unit is used for receiving the level control signal of the main controller module and controlling the input or the cutting of the corresponding sub-compensation power capacitor according to the high level and the low level of the level control signal.
The co-compensation power capacitor and the sub-compensation power capacitor are used for compensating reactive power when being put into operation and providing reactive current.
The alternate unbalance refers to A, B, C three-phase load characteristics, for example, at this time, the phase a lacks reactive power, the phase B, C lacks reactive power, the phase B lacks in the period of time, the phase A, C lacks in the period of time C lacks in the period of time, and the phase A, B lacks in the period of time, so that the alternate unbalance causes that most of the phase A, B, C is fed into the system by the reactive compensation controller in the split combination, and the power factor of the system at this time does not meet the requirement.
The specific alternate unbalanced reactive compensation control is as follows:
the main controller module is used for sampling current operation data of the power grid and calculating three-phase operation active power, reactive power and power factors.
The main controller module is used for calculating an A-phase sub-compensation reactive power demand Qa based on the A-phase running active power, reactive power and power factor, calculating a B-phase sub-compensation reactive power demand Qb based on the B-phase running active power, reactive power and power factor, calculating a C-phase sub-compensation reactive power demand Qc based on the C-phase running active power, reactive power and power factor, taking min (Qa, qb, qc) as the minimum reactive power demand Qmin, wherein the A-phase sub-compensation reactive power demand refers to reactive power from the A-phase power factor to the target power factor, the B-phase sub-compensation reactive power demand refers to reactive power from the B-phase power factor to the target power factor, and the C-phase sub-compensation reactive power demand refers to reactive power from the C-phase power factor to the target power factor.
The main controller module is used for calculating three-phase co-compensation reactive power demand according to Qmin 3, when the three-phase co-compensation reactive power demand is zero, the co-compensation is not needed, when the three-phase co-compensation reactive power demand is non-zero, whether reactive power of a co-compensation power capacitor which is not input currently exists reactive power/reactive power accumulation combination which is close to the three-phase co-compensation reactive power demand and smaller than or equal to the three-phase co-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a co-compensation switching unit corresponding to a co-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding co-compensation switching unit inputs the corresponding co-compensation power capacitor, and the switching state of the main compensation power capacitor is recorded, and when the reactive power is not, the co-compensation cannot be input. Phase proximity means that the index values differ by less than 10kvar.
In this embodiment, the priority of co-compensation is greater than the priority of sub-compensation, and it is first determined whether to switch co-compensation.
For example: reactive power of the co-fed power capacitor which is not currently put into use is 10kvar, 20kvar, 30kvar and 40kvar. If the three-phase co-compensation reactive power demand is 15kvar, the reactive power of the co-compensation power capacitor which is not input currently has 10kvar which is close to the three-phase co-compensation reactive power demand and smaller than the three-phase co-compensation reactive power demand of 15kvar, and a high-level control signal is sent to a co-compensation switching unit corresponding to the co-compensation power capacitor corresponding to the reactive power of 10kvar, and the corresponding co-compensation switching unit inputs the co-compensation power capacitor of the reactive power of 10 kvar.
For another example: and if the three-phase co-compensation reactive power demand is 50kvar, the reactive power of the co-compensation power capacitor which is not input currently has reactive power combination 40kvar and 10kvar which are close to the three-phase co-compensation reactive power demand and equal to the three-phase co-compensation reactive power demand of 15kvar, and a high-level control signal is sent to a co-compensation switching unit corresponding to the co-compensation power capacitor corresponding to the reactive power 40kvar and 10kvar, and the corresponding co-compensation switching unit inputs the co-compensation power capacitor of the reactive power 40kvar and 10 kvar.
The main controller module is used for sampling current operation data calculation of the power grid again at a fixed time interval after the common compensation switching, and when the common compensation is not needed to be put into or cannot be put into, the switching of the sub-compensation is independently judged according to the reactive demand Qa of the sub-compensation A phase, the reactive demand Qb of the sub-compensation B phase and the reactive demand Qc of the sub-compensation C phase respectively:
When the A-phase sub-compensation reactive power demand quantity Qa is zero, the A-phase sub-compensation is not needed to be input, when the A-phase sub-compensation reactive power demand quantity Qa is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the A-phase sub-compensation reactive power demand quantity and is smaller than or equal to the A-phase sub-compensation reactive power demand quantity is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit inputs the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power demand quantity is not equal to the A-phase sub-compensation cannot be input;
When the B-phase sub-compensation reactive power demand Qb is zero, judging whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor which is close to the B-phase sub-compensation reactive power demand and smaller than or equal to the reactive power/reactive power accumulation combination of the B-phase sub-compensation reactive power demand or not, if so, sending a high-level control signal to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, switching the corresponding sub-compensation power capacitor by the corresponding sub-compensation switching unit, recording the switching state of the sub-compensation power capacitor, and if not, failing to switch the B-phase sub-compensation;
C phase division compensation does not need to be input when the C phase division compensation reactive power demand quantity Qc is zero, whether reactive power/reactive power accumulation combination which is close to the C phase division compensation reactive power demand quantity and smaller than or equal to the C phase division compensation reactive power demand quantity exists in reactive power of the division compensation power capacitor which is not input at present is judged when the C phase division compensation reactive power demand quantity Qc is non-zero, a high-level control signal is sent to a division compensation switching unit corresponding to the division compensation power capacitor corresponding to the reactive power/reactive power accumulation combination when the reactive power/reactive power accumulation combination is yes, the corresponding division compensation switching unit inputs the corresponding division compensation power capacitor, the switching state of the division compensation power capacitor is recorded, and C phase division compensation cannot be input when the reactive power/reactive power demand quantity Qc is not.
For example: reactive power of the split charging power capacitor which is not put into practice currently is 10kvar, 20kvar, 30kvar and 40kvar. And if the reactive power demand of the C-phase sub-compensation is 15kvar, the reactive power of the sub-compensation power capacitor which is not input currently has 10kvar which is close to the reactive power demand of the C-phase sub-compensation and smaller than the reactive power demand of the C-phase sub-compensation by 15kvar, and a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power of 10kvar, and the corresponding sub-compensation switching unit inputs the sub-compensation power capacitor of the reactive power of 10 kvar.
The main controller module is used for sampling current operation data calculation of the power grid again in the fixed time period after phase A, phase B or phase C is divided and switched, when three-phase division and compensation cannot be switched, the reactive power of the corresponding division and compensation power capacitor is switched on in the current phase A, the reactive power of the corresponding division and compensation power capacitor is switched on in the current phase B, the same reactive power in the reactive power of the corresponding division and compensation power capacitor is switched on in the current phase C, the reactive power summation sum is obtained through combined accumulation, the reactive power summation is sequenced from large to small, the sequenced reactive power summation sum is sequentially compared with the reactive power of the corresponding co-compensation power capacitor which is not switched on in the current phase, when the reactive power summation sum is close to and smaller than the reactive power of the corresponding co-compensation power capacitor in the current co-compensation power capacitor, a low-level control signal is sent to the corresponding division and compensation switching unit of the corresponding division and compensation power capacitor, the corresponding division and compensation power capacitor is cut off, the corresponding division and compensation power switching unit cuts off the corresponding division and compensation power capacitor is switched on, and the corresponding co-compensation capacitor is switched off, and the corresponding co-compensation power capacitor is switched off. Therefore, the sub-compensation branch is released as far as possible, the effect of co-compensation instead of sub-compensation is achieved, and reactive compensation can be well carried out on alternate unbalanced occasions.
For example: the reactive power of the corresponding sub-compensation power capacitor which is put into the current A phase is 10kvar, 20kvar and 5kvar, the reactive power of the corresponding sub-compensation power capacitor which is put into the current B phase is 10kvar and 5kvar, the reactive power of the corresponding sub-compensation power capacitor which is put into the current C phase is 10kvar and 5kvar, the same reactive power of the corresponding sub-compensation power capacitor which is put into the current A, B, C phase is 10kvar, the same reactive power of the A phase and B, C phase is 10kvar, the combined accumulation is carried out to obtain a reactive power accumulation sum 30kvar, the same reactive power of the A phase and B, C phase is 5kvar, the combined accumulation is carried out to obtain a reactive power accumulation sum 15kvar, the ordered reactive power accumulation sum 30kvar is compared with the reactive power of the corresponding co-compensation power capacitor which is not put into the current 30kvar, 40kvar and 50kvar according to the order from large to small, the reactive power accumulation sum 30kvar is the same as the reactive power 30kvar of the common-compensation power capacitor which is not put into the corresponding common-compensation power capacitor at present, a low-level control signal is sent to a sub-compensation switching unit corresponding to the reactive power accumulation sum (namely, three sub-compensation power capacitors with the reactive power of 10 kvar), the corresponding sub-compensation switching unit cuts off the corresponding sub-compensation power capacitor and records the switching state of the sub-compensation power capacitor, a high-level control signal is sent to a common-compensation switching unit corresponding to the common-compensation power capacitor (namely, the common-compensation power capacitor with the reactive power of 30 kvar), and the corresponding common-compensation switching unit cuts off the common-compensation power capacitor and records the switching state of the common-compensation power capacitor so as to realize the common-compensation replacement sub-compensation; and comparing the sequenced reactive power summation of 15kvar with reactive power of 30kvar, 40kvar and 50kvar of the corresponding co-compensation power capacitor which is not put into the current process, and if the reactive power summation of 15kvar is not close to the reactive power summation, the co-compensation replacement sub-compensation cannot be realized.
The embodiment also provides an alternate unbalanced reactive compensation control method, which is realized by using the alternate unbalanced reactive compensation control system, and the alternate unbalanced reactive compensation control method comprises the following steps:
step one, the main controller module samples the current operation data of the power grid and calculates the operation active power, reactive power and power factor of three phases;
Step two, the main controller module calculates an A-phase sub-compensation reactive power demand Qa based on the A-phase running active power, reactive power and power factor, calculates a B-phase sub-compensation reactive power demand Qb based on the B-phase running active power, reactive power and power factor, calculates a C-phase sub-compensation reactive power demand Qc based on the C-phase running active power, reactive power and power factor, and takes min (Qa, qb, qc) as a minimum reactive power demand Qmin, wherein the sub-compensation reactive power demand refers to reactive power which is worse from a power factor to a target power factor before each sub-compensation reactive power demand;
Step three, the main controller module calculates three-phase co-compensation reactive power demand according to Qmin 3, when the three-phase co-compensation reactive power demand is zero, co-compensation is not needed, when the three-phase co-compensation reactive power demand is non-zero, judging whether reactive power of a co-compensation power capacitor which is not input currently exists reactive power/reactive power accumulation combination which is close to the three-phase co-compensation reactive power demand and is smaller than or equal to the three-phase co-compensation reactive power demand, when the reactive power/reactive power accumulation combination is zero, sending a high-level control signal to a co-compensation switching unit corresponding to a co-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, and the corresponding co-compensation switching unit inputs the corresponding co-compensation power capacitor, and records the switching state of a main compensation power capacitor, and when the reactive power is not input, the co-compensation cannot be input;
Step four, the main controller module samples the current operation data calculation of the power grid again at a fixed time interval after the co-compensation switching, and when the co-compensation is not needed to be put into or can not be put into, the switching of the sub-compensation is independently judged according to the reactive power demand Qa of the sub-compensation A phase, the reactive power demand Qb of the sub-compensation B phase and the reactive power demand Qc of the sub-compensation C phase respectively:
When the A-phase sub-compensation reactive power demand quantity Qa is zero, the A-phase sub-compensation is not needed to be input, when the A-phase sub-compensation reactive power demand quantity Qa is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the A-phase sub-compensation reactive power demand quantity and is smaller than or equal to the A-phase sub-compensation reactive power demand quantity is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit inputs the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power demand quantity is not equal to the A-phase sub-compensation cannot be input;
When the B-phase sub-compensation reactive power demand Qb is zero, judging whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor which is close to the B-phase sub-compensation reactive power demand and smaller than or equal to the reactive power/reactive power accumulation combination of the B-phase sub-compensation reactive power demand or not, if so, sending a high-level control signal to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, switching the corresponding sub-compensation power capacitor by the corresponding sub-compensation switching unit, recording the switching state of the sub-compensation power capacitor, and if not, failing to switch the B-phase sub-compensation;
When the C-phase sub-compensation reactive power demand Qc is zero, the C-phase sub-compensation is not needed to be input, when the C-phase sub-compensation reactive power demand Qc is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the C-phase sub-compensation reactive power demand and is smaller than or equal to the C-phase sub-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit is used for inputting the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power/reactive power demand is not input by the C-phase sub-compensation;
And fifthly, the main controller module re-samples the current operation data calculation of the power grid in the fixed time period after the phase A, the phase B or the phase C sub-compensation switching, when the three-phase sub-compensation cannot be switched in, delaying for a set time, combining and accumulating the same reactive power among the reactive power of the corresponding sub-compensation power capacitor which is switched in the current phase A, the reactive power of the corresponding sub-compensation power capacitor which is switched in the current phase B and the reactive power of the corresponding sub-compensation power capacitor which is switched in the current phase C to obtain a reactive power accumulation sum, sequencing according to the sequence from large to small, comparing the sequenced reactive power accumulation sum with the reactive power of the corresponding co-compensation power capacitor which is not switched in the current phase in sequence, and when the reactive power accumulation sum is close to and smaller than or equal to the reactive power of the corresponding co-compensation power capacitor in the current co-compensation power capacitor, sending a low-level control signal to the reactive power accumulation sum corresponding to the sub-compensation power capacitor, cutting off the corresponding sub-compensation switching unit corresponding to the sub-compensation power capacitor, recording the high-level control signal to the corresponding sub-compensation capacitor, and switching the co-compensation capacitor, and the corresponding switching power capacitor, and the switching unit recording the state of the corresponding co-compensation capacitor.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (5)
1. The alternating unbalanced reactive compensation control system is characterized by comprising a main controller module, a plurality of sub-compensation switching units, a plurality of common-compensation switching units, a plurality of sub-compensation power capacitors and a plurality of common-compensation power capacitors, wherein the plurality of sub-compensation switching units are in one-to-one correspondence with the plurality of sub-compensation power capacitors, the plurality of common-compensation switching units are in one-to-one correspondence with the plurality of common-compensation power capacitors, each sub-compensation power capacitor is connected with a main bus through the corresponding sub-compensation switching unit, each common-compensation power capacitor is connected with the main controller module through the corresponding common-compensation switching unit, each sub-compensation switching unit and the common-compensation switching unit are electrically connected with the main controller module, and the corresponding relationship between the common-compensation switching units and the common-compensation power capacitors and the reactive power of the common-compensation power capacitors are stored in the main controller module;
The main controller module is used for sampling and calculating operation data of the power grid on the main bus, outputting level control signals according to the calculated three-phase data of the power grid to respectively and powerlessly control the co-compensation switching unit and the sub-compensation switching unit, and recording switching states of all power capacitors;
The co-compensation switching unit is used for receiving the level control signal of the main controller module and controlling the input or the cutting of the corresponding co-compensation power capacitor according to the high level and the low level of the level control signal;
the sub-compensation switching unit is used for receiving the level control signal of the main controller module and controlling the input or the cutting of the corresponding sub-compensation power capacitor according to the high level and the low level of the level control signal;
the co-compensation power capacitor and the sub-compensation power capacitor are used for compensating reactive power when the power-on and providing reactive current.
2. The alternating unbalanced reactive compensation control system of claim 1, wherein the master controller module is configured to sample current operational data of the power grid to calculate operational active power, reactive power, and power factors for three phases;
the main controller module is used for calculating a phase A sub-compensation reactive power demand Qa based on the running active power, reactive power and power factor of the phase A, calculating a phase B sub-compensation reactive power demand Qb based on the running active power, reactive power and power factor of the phase B, calculating a phase C sub-compensation reactive power demand Qc based on the running active power, reactive power and power factor of the phase C, taking min (Qa, qb, qc) as the minimum reactive power demand Qmin, wherein the sub-compensation reactive power demand refers to reactive power which is worse from the power factor to the target power factor before each equivalent;
The main controller module is used for calculating three-phase co-compensation reactive power demand according to Qmin x 3, when the three-phase co-compensation reactive power demand is zero, the co-compensation is not needed, when the three-phase co-compensation reactive power demand is non-zero, whether reactive power of a co-compensation power capacitor which is not input currently exists reactive power/reactive power accumulation combination which is close to the three-phase co-compensation reactive power demand and is smaller than or equal to the three-phase co-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is positive, a high-level control signal is sent to a co-compensation switching unit corresponding to a co-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding co-compensation switching unit inputs the corresponding co-compensation power capacitor, and the switching state of the main compensation power capacitor is recorded, and when the reactive power is negative, the reactive power/reactive power accumulation combination cannot be input;
The main controller module is used for sampling current operation data calculation of the power grid again at a fixed time interval after the co-compensation switching, and when the co-compensation is not needed to be put into or can not be put into, the switching of the sub-compensation is independently judged according to the reactive demand Qa of the sub-compensation A phase, the reactive demand Qb of the sub-compensation B phase and the reactive demand Qc of the sub-compensation C phase respectively:
When the A-phase sub-compensation reactive power demand quantity Qa is zero, the A-phase sub-compensation is not needed to be input, when the A-phase sub-compensation reactive power demand quantity Qa is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the A-phase sub-compensation reactive power demand quantity and is smaller than or equal to the A-phase sub-compensation reactive power demand quantity is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit inputs the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power demand quantity is not equal to the A-phase sub-compensation cannot be input;
When the B-phase sub-compensation reactive power demand Qb is zero, judging whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor which is close to the B-phase sub-compensation reactive power demand and smaller than or equal to the reactive power/reactive power accumulation combination of the B-phase sub-compensation reactive power demand or not, if so, sending a high-level control signal to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, switching the corresponding sub-compensation power capacitor by the corresponding sub-compensation switching unit, recording the switching state of the sub-compensation power capacitor, and if not, failing to switch the B-phase sub-compensation;
When the C-phase sub-compensation reactive power demand Qc is zero, the C-phase sub-compensation is not needed to be input, when the C-phase sub-compensation reactive power demand Qc is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the C-phase sub-compensation reactive power demand and is smaller than or equal to the C-phase sub-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit is used for inputting the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power/reactive power demand is not input by the C-phase sub-compensation;
The main controller module is used for sampling current operation data calculation of the power grid again in the fixed time period after the phase A, the phase B or the phase C is subjected to partial compensation switching, when three-phase partial compensation cannot be switched in, the reactive power of the corresponding partial compensation power capacitor which is already switched in by the phase A, the reactive power of the corresponding partial compensation power capacitor which is already switched in by the phase B and the reactive power of the corresponding partial compensation power capacitor which is already switched in by the phase C are combined and accumulated to obtain a reactive power accumulation sum, the reactive power accumulation sum is compared with the reactive power of the corresponding co-compensation power capacitor which is not already switched in by the phase A, when the reactive power accumulation sum is close to and smaller than the reactive power of the corresponding co-compensation power capacitor which is not already switched in by the phase A, a low-level control signal is sent to the corresponding partial compensation switching unit of the reactive power accumulation sum, the corresponding partial compensation power capacitor is cut off, the switching state of the corresponding partial compensation power capacitor is recorded, the high-level control signal is sent to the corresponding co-compensation switching unit of the co-compensation power capacitor is cut off, and the co-compensation capacitor is switched in the state.
3. The alternating unbalanced reactive compensation control system of claim 2, wherein the main controller module is configured to re-sample current operation data of the power grid for a fixed period of time after the phase a, phase B or phase C partial switching, and to add up the same reactive power among the reactive power of the corresponding partial power capacitor to which the current phase a has been switched, the reactive power of the corresponding partial power capacitor to which the current phase B has been switched, and the reactive power of the corresponding partial power capacitor to which the current phase C has been switched to obtain a reactive power addition sum after delaying a set time when the reactive power addition sum is close to and equal to the reactive power of the corresponding one of the co-compensation power capacitors to which the current phase does not have been switched, to send a low level control signal to a partial switching unit corresponding to the reactive power addition sum, to cut off the corresponding partial switching unit to write the corresponding one of the co-compensation power capacitors to write the corresponding co-compensation power capacitors to each other, and to record a high level of the co-compensation capacitors to write the corresponding to the co-compensation capacitors to each other.
4. An alternate unbalanced reactive compensation control method, characterized in that it is implemented by the alternate unbalanced reactive compensation control system of claim 2, the alternate unbalanced reactive compensation control method comprising the steps of:
step one, the main controller module samples the current operation data of the power grid and calculates the operation active power, reactive power and power factor of three phases;
Step two, the main controller module calculates an A-phase sub-compensation reactive power demand Qa based on the A-phase running active power, reactive power and power factor, calculates a B-phase sub-compensation reactive power demand Qb based on the B-phase running active power, reactive power and power factor, calculates a C-phase sub-compensation reactive power demand Qc based on the C-phase running active power, reactive power and power factor, and takes min (Qa, qb, qc) as a minimum reactive power demand Qmin, wherein the sub-compensation reactive power demand refers to reactive power which is worse from a power factor to a target power factor before each sub-compensation reactive power demand;
Step three, the main controller module calculates three-phase co-compensation reactive power demand according to Qmin 3, when the three-phase co-compensation reactive power demand is zero, co-compensation is not needed, when the three-phase co-compensation reactive power demand is non-zero, judging whether reactive power of a co-compensation power capacitor which is not input currently exists reactive power/reactive power accumulation combination which is close to the three-phase co-compensation reactive power demand and is smaller than or equal to the three-phase co-compensation reactive power demand, when the reactive power/reactive power accumulation combination is zero, sending a high-level control signal to a co-compensation switching unit corresponding to a co-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, and the corresponding co-compensation switching unit inputs the corresponding co-compensation power capacitor, and records the switching state of a main compensation power capacitor, and when the reactive power is not input, the co-compensation cannot be input;
Step four, the main controller module samples the current operation data calculation of the power grid again at a fixed time interval after the co-compensation switching, and when the co-compensation is not needed to be put into or can not be put into, the switching of the sub-compensation is independently judged according to the reactive power demand Qa of the sub-compensation A phase, the reactive power demand Qb of the sub-compensation B phase and the reactive power demand Qc of the sub-compensation C phase respectively:
When the A-phase sub-compensation reactive power demand quantity Qa is zero, the A-phase sub-compensation is not needed to be input, when the A-phase sub-compensation reactive power demand quantity Qa is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the A-phase sub-compensation reactive power demand quantity and is smaller than or equal to the A-phase sub-compensation reactive power demand quantity is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit inputs the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power demand quantity is not equal to the A-phase sub-compensation cannot be input;
When the B-phase sub-compensation reactive power demand Qb is zero, judging whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor which is close to the B-phase sub-compensation reactive power demand and smaller than or equal to the reactive power/reactive power accumulation combination of the B-phase sub-compensation reactive power demand or not, if so, sending a high-level control signal to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, switching the corresponding sub-compensation power capacitor by the corresponding sub-compensation switching unit, recording the switching state of the sub-compensation power capacitor, and if not, failing to switch the B-phase sub-compensation;
When the C-phase sub-compensation reactive power demand Qc is zero, the C-phase sub-compensation is not needed to be input, when the C-phase sub-compensation reactive power demand Qc is non-zero, whether reactive power of a sub-compensation power capacitor which is not input currently exists in reactive power of the sub-compensation power capacitor, reactive power/reactive power accumulation combination which is close to the C-phase sub-compensation reactive power demand and is smaller than or equal to the C-phase sub-compensation reactive power demand is judged, when the reactive power/reactive power accumulation combination is yes, a high-level control signal is sent to a sub-compensation switching unit corresponding to the sub-compensation power capacitor corresponding to the reactive power/reactive power accumulation combination, the corresponding sub-compensation switching unit is used for inputting the corresponding sub-compensation power capacitor, and the switching state of the sub-compensation power capacitor is recorded, and when the reactive power/reactive power demand is not input by the C-phase sub-compensation;
and fifthly, the main controller module re-samples the current operation data calculation of the power grid in the fixed time period after the phase A, the phase B or the phase C is subjected to sub-switching, when the three-phase sub-switching cannot be performed, the reactive power of the corresponding sub-switching power capacitor is subjected to the phase A, the reactive power of the corresponding sub-switching power capacitor is subjected to the phase B, the reactive power of the same reactive power in the reactive power of the corresponding sub-switching power capacitor is subjected to the phase C, the reactive power sum is obtained by combining and accumulating the reactive powers, the reactive power sum is compared with the reactive power of the corresponding co-switching power capacitor which is not subjected to the phase C, when the reactive power sum is close to and smaller than the reactive power of the corresponding co-switching power capacitor, a low-level control signal is sent to the sub-switching unit corresponding to the reactive power sum, the corresponding sub-switching power capacitor is cut off, the switching state of the corresponding sub-switching power capacitor is recorded, and the high-level control signal is sent to the corresponding co-switching power unit, and the co-switching capacitor is subjected to the co-switching power state of the corresponding co-switching power capacitor.
5. The method according to claim 4, wherein in the fifth step, the main controller module re-samples the current operation data of the power grid for the fixed period of time after the phase a, phase B or phase C is divided and switched, and when the three phases of the division and the compensation are unable to be switched, delays a set time to add up the same reactive power among the reactive power of the corresponding division and compensation capacitor of the current phase a, the reactive power of the corresponding division and compensation capacitor of the current phase B and the reactive power of the corresponding division and compensation capacitor of the current phase C to obtain a reactive power addition sum, and performs sorting according to the size, compares the sorted reactive power addition sum with the reactive power of the corresponding co-compensation capacitor not currently switched in sequence, and when the reactive power of a certain reactive power addition sum and the reactive power of a certain co-compensation capacitor of the corresponding co-compensation capacitor is close to and less than or equal to the reactive power of the corresponding co-compensation capacitor, generates a low level control signal to the reactive power addition unit corresponding to the corresponding division and switching unit, the cut-off the co-compensation capacitor of the corresponding co-compensation capacitor of the current non-compensation capacitor, and the co-compensation capacitor of the current non-compensation capacitor is recorded.
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