Ultra-high voltage grid operating control mode for controlling in-series execution of performance evaluation criterion

Abstract

The invention discloses an ultra-high voltage grid operating control mode for controlling the in-series execution of performance evaluation criterion. The ultra-high voltage grid operating control mode comprises the following steps of: S1, evaluating an ultra-high voltage two-region interconnection power grid according to the control performance standard (CPS) standard, and regulating a region by using a corresponding control strategy aiming at an evaluation result of the region; S2, judging whether a differential value (delta PT is equal to PT-P0) of ultra-high voltage connecting line exchange power PT and plan exchange power P0 is within the range of a safety value or not, if so, executing the step S1, and otherwise, executing the step S3; and S3, evaluating the ultra-high voltage two-region interconnection power grid according to the T standard, regulating the region by using the corresponding control strategy aiming at the evaluation result of the region, and executing the step S2. According to the ultra-high voltage grid operating control mode, the CPS standard is adopted in the normal operating state according to different operating states of the ultra-high voltage interconnection power grid, and the safety and high quality of frequency are emphasized; and when the ultra-high voltage connecting line power is out-of-limit, the T standard is switched, so that the deviation of the ultra-high voltage connecting line power can be restored quickly.

Description

technical field [0001] The invention relates to an operation control mode of an ultra-high voltage power grid implemented in series with control performance evaluation standards. Background technique [0002] With the continuous development of the interconnected grid, my country's UHV interconnected grid has initially formed. In the initial stage of the construction of the UHV interconnected grid, the power control of the UHV tie line is very important. The power deviation of the UHV tie line cannot exceed the limit, and its power deviation is too large. It affects the safe and stable operation of the UHV interconnected grid, causing safety to become the main contradiction in the operation of the UHV interconnected grid. The performance of the control area in controlling the power of the UHV tie line is evaluated, refer to figure 1 , area i and area r are two two-area power grids interconnected by UHV tie-lines. It is defined that the power of UHV tie-lines is transmitted fro...

AI Technical Summary

Problems solved by technology

The first case: when there is power fluctuation in area i so that the ACE of area i is less than zero and the ACE of area r is equal to zero, the UHV tie line power deviation ΔP T will be less than zero, according to the requirements of the T1 standard, the area i will increase the output of the unit, making the power deviation ΔP of the UHV tie line T is restored; the second case: when there is a power fluctuation in area i so that the ACE of area i is greater than zero, and the ACE of area r is equal to zero, it is similar to the first case; the third case: when there is a power fluctuation in area r such that area r ACE is less than zero, and when the ACE of area i is equal to zero, the UHV tie line power deviation ΔP T will be greater than zero. At this time, in order to quickly restore the power deviation ΔP of the UHV tie line in the area i T , area i will reduce the output and adjust the ACE in this area to the direction of ACE in area r, so that ACE i / B i = ACE r / B r , UHV tie line power deviation ΔP T will be equal to zero, but this is not conducive to the recovery of UHV interconnected grid system frequency

The fourth case: when there is a power fluctuation in area r so that the ACE of area r is greater than zero and the ACE of area i is equal to zero, it is similar to the third case. From the above, it can be seen that in some cases under the T standard, the area is decreasing The power deviation of the small UHV tie line will also increase the frequency deviation of the interconnected grid system. Therefore, if the T standard is used to evaluate the UHV interconnected grid under normal operating conditions, the frequency quality of the UHV interconnected grid will be poor , which also threatens the safe and stable operation of the UHV interconnected grid, and this problem needs to be resolved urgently

[0004] In addition, in the prior art, it is also proposed to use the parallel implementation of CPS standard and T standard in time to solve the above problems, that is, there are both control areas using CPS standard and control areas using T standard in the same period of time, refer to figure 2 In the two-area interconnected power grid, the control area a of area i adopts the CPS standard, the control area b adopts the T standard, and the area r adopts the T standard. This is a case where the CPS standard and the T standard are implemented in parallel. When the ACE of area r is less than zero and the ACE of area i is equal to zero: when the power of the UHV tie line exceeds the limit and the frequency of the interconnected grid system decreases, according to the requirements of the T1 standard, the output of the unit in area r will be increased to reduce the power of the UHV tie line In order to quickly restore the power deviation of the UHV tie line, the control area b will reduce the output so that the ACE signs of area i and area r are the same, while the control area a will increase the output in order to restore the system frequency under the CPS standard. At this time, the area i The contradictory adjustment of control area a and control area b will cause the power deviation of the UHV tie line to be unable to recover for a long time, and may also increase the frequency deviation of the system, which is not good for the recovery of the power of the UHV tie line and the system frequency. In the way of parallel implementation, the AGC adjustment of the control area using the CPS standard and the AGC adjustment of the control area using the T standard will be contradictory in some cases, which is not only harmful to the rapid speed of the UHV tie line power exceeding the limit and frequency deviation Restoration also causes anti-tune and wastes resources

Moreover, this parallel implementation of the control mode will invalidate the T standard in some cases, failing to achieve the expected results of the T standard

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