CN109462240B - Reactive power coordination control method and device for extra-high voltage direct current layered access - Google Patents
Reactive power coordination control method and device for extra-high voltage direct current layered access Download PDFInfo
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- CN109462240B CN109462240B CN201811371836.7A CN201811371836A CN109462240B CN 109462240 B CN109462240 B CN 109462240B CN 201811371836 A CN201811371836 A CN 201811371836A CN 109462240 B CN109462240 B CN 109462240B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a reactive coordination control method and a device for extra-high voltage direct current layered access, according to the actual situation of reactive control under a layered access mode, when a high-end valve bank or a low-end valve bank of a certain pole is unlocked or locked under set power, the continuous switching of a filter is started by judging the change of a reactive mode to instruct the locking interval time, and the filters of the corresponding alternating current networks of the valve banks are quickly switched in or switched off by respective reactive control functions, so that the overload or alternating current overvoltage of reactive equipment is avoided, the stable operation of an alternating current system is maintained, and the method and the device have great engineering application value. When a certain alternating current network starts the absolute minimum filter to limit power, the direct current transmission power distribution strategy is optimized, the power reference value of each valve group under the power limiting is calculated, the loss of direct current power is reduced, and the direct current transmission distribution strategy is more reasonable.
Description
Technical Field
The invention belongs to the technical field of extra-high voltage direct current transmission, and particularly relates to a reactive power coordination control method and device for extra-high voltage direct current layered access.
Background
With the wide application of the extra-high voltage alternating current and direct current technology, the phenomenon that multiple loops of direct current are intensively fed into a receiving end load center becomes a ubiquitous phenomenon of a power grid in China. With the continuous increase of the direct current transmission capacity, direct current drop points are more and more dense, the existing direct current access mode is not beneficial to tidal current evacuation of a receiving end system, and a series of problems can be brought in the aspect of voltage support. In order to solve the problem, a planned extra-high voltage direct current transmission project uses a direct current layered access technology to access a high-end converter and a low-end converter of extra-high voltage direct current into alternating current systems with different voltage grades respectively.
At present, a plurality of extra-high voltage direct current (UHVDC) devices adopting a layered access mode are put into operation, and a low-voltage Alternating Current (AC) grid and a high-voltage AC grid at a receiving end under the layered access mode are respectively connected with a high-end valve bank and a low-end valve bank. At present, the research on the reactive power coordination technology of the converter station in the layered access mode is not deep enough, the basic strategy is still to adopt the reactive power control strategy under the conventional extra-high voltage direct current, and the operation requirement of the layered access mode can not be met under some special working conditions, such as transient working conditions.
Disclosure of Invention
The invention aims to provide a reactive power coordination control method and device for extra-high voltage direct current layered access, which are used for solving the problem that the conventional extra-high voltage reactive power control strategy in the prior art is not suitable for reactive power coordination control of an extra-high voltage direct current layered system.
In order to achieve the aim, the invention provides a reactive power coordination control method for extra-high voltage direct current layered access, which comprises the following steps:
when the high-end valve group or the low-end valve group of the pole is unlocked, the blocking interval time of all filter input request instructions is set as a first set value, and when any filter input request instruction is received, the corresponding filter bank input is controlled according to the blocking interval time as the first set value.
The invention also provides a reactive power coordination control device for the extra-high voltage direct current layered access, which comprises a processor, wherein the processor is used for executing instructions to realize the filter bank input method.
According to the actual situation of reactive power control in a layered access mode, when an extremely high-end valve bank or an extremely low-end valve bank is unlocked, the blocking interval time of all filter input requests is set to be a first set value, when a filter request is input, the corresponding filter set input is controlled according to the set blocking interval time, compared with the prior art, the filter set can be rapidly input, overload or alternating current overvoltage of reactive power equipment is avoided, stable operation of an alternating current system is maintained, and the method has a great engineering application value.
In order to control the input accuracy of the filter, when an extremely high-end valve bank or a low-end valve bank is unlocked, the power of the extra-high voltage direct current system is also detected, and when the power reaches a first set power value, the high-end valve bank or the low-end valve bank to be unlocked is controlled to receive a second set power value transferred by other valve banks.
Further, the first set value is 500ms.
In order to control reactive coordination under the transient working condition, when an AC network starts an absolute minimum filter, a power reference value of each valve bank connected with the AC network is calculated according to a power limit value of the absolute minimum filter and the input number of the valve banks, and each valve bank operates according to the power reference value.
Further, the expression of the power reference value of the high-end valve group is as follows:
wherein, P lim The power value of the absolute minimum filter is N1, the input number of the high-end valve groups is N1, and the value of N1 is 1 or 2;
the expression for the power reference value of the low side valve bank is:
P G22 ＝P G11 +(N2-1)P new
wherein, P new Allowed for ac networks with limiting power for absolute minimum filter not activatedAnd (3) a power transmission value, wherein N2 is the input number of the low-end valve banks, and the value of N2 is 1 or 2.
The invention also provides a reactive power coordination control method for extra-high voltage direct current layered access, which comprises the following steps:
and when the high-end valve bank or the low-end valve bank of the high-end valve is locked, setting the interval time of all the filter cutting request instructions as a second set value, and when any one filter cutting request instruction is received, controlling the cutting of the corresponding filter bank according to the second set value of the locking interval time.
The invention also provides a reactive power coordination control device for the extra-high voltage direct current layered access, which comprises a processor, wherein the processor is used for executing instructions to realize the filter bank cutting method.
According to the actual situation of reactive power control in a layered access mode, when a high-end valve bank or a low-end valve bank of a pole is locked, the locking interval time of putting all filters into a request is set as a second set value, when the filters request to be cut off, the corresponding filter banks are controlled to be cut off according to the set locking interval time, compared with the prior art, the filter banks can be cut off rapidly, overload or alternating current overvoltage of reactive power equipment is avoided, stable operation of an alternating current system is maintained, and the method has great engineering application value.
In order to control the accuracy of the filter cut, when an extremely high-end valve bank or a low-end valve bank is locked, the power of an extra-high voltage direct current system is also detected, and when the power reaches a first set power value, the transmission power of the high-end valve bank or the low-end valve bank to be locked is controlled to be reduced to a third set power value.
Further, the second set value is 500ms.
In order to control reactive coordination under the transient working condition, when an AC network starts an absolute minimum filter, a power reference value of each valve bank connected with the AC network is calculated according to a power limit value of the absolute minimum filter and the input number of the valve banks, and each valve bank operates according to the power reference value.
Further, the expression of the power reference value of the high-end valve group is as follows:
wherein, P lim The power value of the absolute minimum filter is N1, the input number of the high-end valve groups is N1, and the value of N1 is 1 or 2;
the expression for the power reference value for the low side bank of valves is:
P G22 ＝P G11 +(N2-1)P new
wherein, P new And N2 is the allowed power transmission value of the alternating current network without starting the absolute minimum filter to limit the power, and the value of N2 is 1 or 2.
Drawings
FIG. 1 is a schematic diagram of the fast reactive power input when unlocking a very second valve bank according to the present invention;
FIG. 2 is a schematic diagram of the second valve block of the blocking pole of the present invention showing the fast cutting of reactive power;
fig. 3 is a schematic diagram of dc power distribution of each valve set when the absolute minimum filter of the present invention does not satisfy the power limit.
Detailed Description
The following description of the embodiments of the invention is provided in connection with the accompanying drawings:
the converter station adopts layered access, and comprises a high-end valve group and a low-end valve group, wherein each high-end valve group and each low-end valve group are correspondingly connected with an alternating current filter. In the embodiment, an extra-high voltage dc receiving end 500kV ac network and a 1000kV ac network in a layered access manner are respectively accessed to a high-end valve bank and a low-end valve bank of two poles, and the high-end valve bank and the low-end valve bank are configured with independent filters and reactive control functions. When the high-end valve bank or the low-end valve bank of the high-end is unlocked, the blocking interval time of all filter input request instructions is set to be a first set value, and when any filter input request instruction is received, the corresponding filter bank is controlled to be input according to the first set value of the blocking interval time.
Under the transient working condition, according to the actually transmitted direct current power, when the high-end valve bank or the low-end valve bank is unlocked or the high-end valve bank or the low-end valve bank is locked, the alternating current filter is quickly switched on or switched off. Specifically, the reactive power coordination control method for the extra-high voltage direct current layered access comprises the following steps:
1. detecting the power of an extra-high voltage direct current system, when the transmission power of the extra-high voltage direct current system reaches a first set power value, unlocking a high-end valve bank or a low-end valve bank of an electrode, wherein the high-end valve bank or the low-end valve bank receives a second set power value transferred by other valve banks, when the power received by the high-end valve bank or the low-end valve bank to be unlocked is half of the first set power value, as other implementation modes, the power received by the high-end valve bank or the low-end valve bank to be unlocked can also be other multiples of the first set power value, at the moment, switching a filter corresponding to the high-end valve bank or the low-end valve bank to be continuously switched into a locking interval time to a first set value t1, wherein t1 is 500ms, the valve bank needs a large amount of reactive compensation in a short time, a conventional minimum filter and reactive control switching request for overlong time delay cannot meet the demand of reactive power quick switching, at the moment, an automatic reactive power quick switching method functions, as shown in figure 1, and the automatic reactive power quick switching method starts the automatic reactive power switching of the filter switching interval time, and ensures that the minimum filter and Q/U control can be switched into a quick load can be avoided; for fig. 1, the time for putting all filters into the blocking interval is set to be 500ms, when the absolute minimum filter requests to put in, the absolute minimum filter is put in by delaying 500ms, when the minimum filter requests to put in, the minimum filter is put in by delaying 5s, and when the Q/U requests to put in, the Q/U is put in after delaying 3 s; if the absolute minimum filter is already put into use, if the input request of any other filter exists all the time, the input request can be executed only after the locking interval time reaches 500ms, and the input output of the filter is effective.
2. When the high-end valve set or the low-end valve set of the pole is locked under the first set power value, the transmitted DC power is reduced to a third set power value, for example, the DC power is locked after the DC power is quickly reduced to the minimum powerThe valve block is used in an AC filter which needs to be cut off in a short time, as in the prior art Q max The function can only cut one group for 1s, the consumed time is long, and the requirement of a direct current transmission system is not met, at the moment, the automatic switching of the continuous cutting blocking interval time of the filter can be rapidly started according to the judging method shown in figure 2 by judging the change of the reactive configuration mode caused by the exit of the extremely high-end valve group or the low-end valve group, namely, before the power of the high-end valve group or the low-end valve group is reduced to the minimum power, the continuous cutting blocking interval time of the filter is switched to a second preset value t2, t2 is 500ms, so as to ensure that Q is ensured max 、U max And Q/U control can quickly cut off all the filters, shorten the exiting process of the valve bank and avoid alternating current overvoltage. For FIG. 2, the time to remove the dwell interval for all filters is set to 500ms when Q is max When cut-off is requested, the minimum filter cut-off is delayed by 1s, when U max When the request is cut off, the 3s delay minimum filter is cut off, and when the Q/U request is cut off, the 3s/2s delay minimum filter is cut off; if the absolute minimum filter is satisfied, if any other filter cut request exists all the time, the cut request is executed after the lock-out interval time is up to 500ms, and the filter cut output is valid.
3. When there is an ac network to start the absolute minimum filter, when the absolute minimum filter does not meet the start limit power, or the absolute minimum filters of two ac networks do not meet the start limit power, the dc power of another valve set connected in series with the filter will also be reduced to the same allowable value, which will lose a large amount of dc power. In order to control reactive coordination under the transient working condition, the power reference value of each valve bank connected to the ac network is calculated according to the power limit value of the absolute minimum filter and the number of the valve banks to be put into operation, and each valve bank operates with the power reference value.
The expression of the power reference value of the high-end valve bank is as follows:
wherein, P lim The power value of the absolute minimum filter is N1, the input number of the high-end valve groups is N1, and the value of N1 is 1 or 2;
the expression of the power reference value of the low-end valve bank is as follows:
P G22 ＝P G11 +(N2-1)P new
wherein, P new And N2 is the input number of the low-end valve groups, and the value of N2 is 1 or 2.
The filter power limit coordination control method is shown in fig. 3, wherein the absolute minimum filter of the 500kV alternating current network does not meet the power limit request, and the power limit value P is output after 30s time delay lim_ACF500 (corresponding to the power reference value for the high port valve set or the power reference value for the low port valve set calculated above), the power limit value remains open after 35 s. The limit power value is divided by bipolar direct current voltage to obtain allowable direct current value, the bipolar direct current voltage can be directly obtained by collection, and the bipolar direct current voltage comprises a pole 1U dL -U dM And 2U dL -U dM . The absolute minimum filter unsatisfied power limit logic for a 1000kV ac network is consistent with the above description. In fig. 3 15000 is the per unit value of system power, which is not reached by normal system power. The current limiting value selected by the two alternating current networks is output as the final running current value I of the direct current system after the minimum value is selected lim In this way, the two valve banks of different poles connected to the ac network will be operated as new power reference values after being equally distributed according to the selected power limit values, and the power lost by the ac network will be distributed as much as possible between the two valve banks connected to the other ac network, depending on the on/off status of the two valve banks and the overload allowance of the valve banks, to minimize the loss of dc power.
The invention also provides a reactive power coordination control device for the extra-high voltage direct current layered access, which comprises a processor, wherein the processor is used for executing instructions to realize the filter bank input method; the processor of the apparatus is further configured to execute the instruction to implement the filter bank removing method, and since the processing procedure of the processor of the apparatus is the kyuke or the program corresponding to the method, and the filter bank inputting and removing method has been described in detail in the foregoing embodiments, detailed description of the specific implementation of the apparatus is omitted here.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. A reactive power coordination control method for extra-high voltage direct current layered access is characterized by comprising the following steps:
when the high-end valve bank or the low-end valve bank of the high-end is unlocked, the blocking interval time of all filter input request instructions is set to be a first set value, and when any filter input request instruction is received, the corresponding filter bank is controlled to be input according to the first set value of the blocking interval time;
when the high-end valve bank or the low-end valve bank of the pole is unlocked, the transmission power of the extra-high voltage direct current system is also detected, and when the power reaches a first set power value, the high-end valve bank or the low-end valve bank to be unlocked is controlled to receive a second set power value transferred by other valve banks; when an AC network starts an absolute minimum filter, calculating a power reference value of each valve bank connected with the AC network according to a power limiting value of the absolute minimum filter and the input number of the valve banks, wherein each valve bank operates according to the power reference value;
the expression of the power reference value of the high-end valve group is as follows:
wherein, P lim Is the absolute maximumThe power value of the small filter, N1 is the input number of the high-end valve group, and the value of N1 is 1 or 2;
the expression for the power reference value for the low side bank of valves is:
P G22 ＝P G11 +(N2-1)P new
wherein, P new And N2 is the allowed power transmission value of the alternating current network without starting the absolute minimum filter to limit the power, and the value of N2 is 1 or 2.
2. The method for reactive power coordinated control of extra-high voltage direct current hierarchical access according to claim 1, wherein the first set value is 500ms.
3. A reactive power coordination control method for extra-high voltage direct current layered access is characterized by comprising the following steps:
when a high-end valve bank or a low-end valve bank of an extremely high valve is locked, setting the interval time of all filter cutting request instructions as a second set value, and when any filter cutting request instruction is received, controlling the cutting of the corresponding filter bank according to the second set value of the locking interval time;
when a high-end valve bank or a low-end valve bank of an electrode is locked, the transmission power of the extra-high voltage direct current system is also detected, and when the power reaches a first set power value, the transmission power of the high-end valve bank or the low-end valve bank to be locked is controlled to be reduced to a third set power value; when an AC network starts an absolute minimum filter, calculating a power reference value of each valve bank connected with the AC network according to a power limiting value of the absolute minimum filter and the input number of the valve banks, wherein each valve bank operates according to the power reference value;
the expression of the power reference value of the high-end valve bank is as follows:
wherein, P lim For the absolute minimum power value of the filter, N1 is the high-end valve groupThe input number is 1 or 2, and the value of N1 is 1 or 2;
the expression for the power reference value for the low side bank of valves is:
P G22 ＝P G11 +(N2-1)P new
wherein, P new And N2 is the allowed power transmission value of the alternating current network without starting the absolute minimum filter to limit the power, and the value of N2 is 1 or 2.
4. The method according to claim 3, wherein the second set value is 500ms.
5. An extra-high voltage direct current layered access reactive power coordination control device, which is characterized by comprising a processor, wherein the processor is used for executing instructions to realize the method according to any one of claims 1-2.
6. An extra-high voltage direct current layered access reactive power coordination control device, which is characterized by comprising a processor, wherein the processor is used for executing instructions to realize the method according to any one of claims 3-4.
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