A UHV DC transient recovery optimization method, system, terminal and readable storage medium considering voltage stability of receiving end grid
An ultra-high voltage DC, transient recovery technology, applied in the direction of AC network voltage adjustment, power transmission AC network, electrical components, etc. The effect of state voltage stability
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Embodiment 1
[0073] In this embodiment, an optimization model for transient recovery of an ultra-high voltage DC system is constructed, and an optimal recovery strategy for DC active power in a transient process is determined based on the model. Wherein, a UHV DC transient recovery optimization method considering the voltage stability of the receiving end grid provided by this embodiment includes the following steps:
[0074] Step S1: The goal is to minimize the sum of the deviation between the rotating reserve capacity and the expected value of the conventional generator set of the receiving-end power grid, and the deviation between the DC active power control value and the initial value, and at least take the transient voltage stability of the receiving-end power grid as a constraint condition to establish an ultra-high voltage An optimization model for transient recovery of DC systems. Among them, the objective function in the transient recovery optimization model of UHVDC system is as ...
Embodiment 2
[0109] This embodiment is different from Embodiment 1 in that, in this embodiment, the above formulas (6) and (7) are directly used to find a value that satisfies: the minimum DC active power reduction in exchange for the minimum deviation of the generator rotating reserve capacity from its expected value. DC power P di and spinning reserve capacity P ri . Specifically, a DC transient recovery optimization method considering the voltage stability of the receiving end grid provided by this embodiment includes the following steps:
[0110] Step S1-1: Construct a transient stable fault set and determine the maximum AC fault Ω 1 , and then establish the maximum AC fault Ω based on the steady-state constraints in the UHV DC system transient recovery optimization model 1 The relationship between the DC active power and the rotating reserve capacity of the generator set during the transient recovery process;
[0111] Step S1-2: Based on the relationship between the DC active powe...
Embodiment 3
[0116] This embodiment provides a system based on the above-mentioned DC transient recovery optimization method, which at least includes: a transient stable fault set construction module, a maximum AC fault processing module, a calculation module and a strategy acquisition module.
[0117] Among them, the transient stable fault set building module is used to construct the transient stable fault set;
[0118] The maximum AC fault processing module is used to determine the maximum AC fault Ω in the transient stable fault set 1 , and then establish the maximum AC fault Ω based on the steady-state constraints in the UHV DC system transient recovery optimization model 1 The relationship between the DC active power and the rotating reserve capacity of the generator set during the transient recovery process;
[0119] The calculation module is used to calculate the maximum AC fault Ω based on the relationship between the constructed DC active power and the rotating reserve capacity o...
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