Decoupling Coordination Method for Optimal Target Control Based on Voltage and Reactive Power Decoupling Criterion
A voltage reactive power and criterion technology, applied in the field of decoupling coordination, can solve problems such as low efficiency, errors, fuzzy and complex control models and algorithms, etc.
Inactive Publication Date: 2017-12-08
傅辉明 +1
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Problems solved by technology
Existing power system voltage and reactive power control (VQC) technologies are all based on the traditional U-Q control criterion. The defects and deficiencies of the existing U-Q control technology in real-time closed-loop control are mainly: ①The U-Q criterion is not The nature of linear coupling leads to confusion in its coordinated control characteristics, and it is impossible to distinguish and clarify the respective goals and control effects of voltage regulation and reactive power compensation, and it is difficult to form a voltage and reactive power coordinated control model with the optimal target; ②U-Q criterion The control function is not clear, and the influence of reactive voltage drop, active voltage drop, and system voltage on the bus voltage change cannot be judged, and the regulation value cannot be accurately given
③ The control model and algorithm of the U-Q criterion are fuzzy and complex, and cannot fully take into account the influence of the voltage drop of active loads, and the problems exposed by it become problems that must be avoided in VQC requirements
[0004] These deficiencies and deficiencies of U-Q control technology lead to frequent adjustments of VQC equipment in substations, prone to oscillations, etc., such as coordination errors and control inaccuracies caused by "blind" control.
These problems make the existing substation VQC device unable to operate reliably, resulting in low efficiency and low commissioning rate of the existing substation VQC device
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Embodiment 1
[0104] Such as figure 1 As shown, the decoupling coordination method for realizing optimal target control based on the voltage and reactive power decoupling criterion described in the present invention includes the following steps:
[0105] 1. Construct the analog circuit according to the rated parameters of the 35kV / 10kV substation
[0106] This embodiment is to simulate a 35kV / 10kV substation, implement V—I Q Optimal target control, the load takes the phase voltage to operate, and the rated parameters of the phase voltage circuit are as follows:
[0107] The no-load phase voltage ratio of the reference gear is; 6.26kV / 20.2kV=0.31;
[0108] The 35KV line impedance is reduced to the 10KV side: R L2 = 0.62Ω, X L2 =5.5Ω(L L2 =5.5 / 314=17.75mH);
[0109] Transformer rated current: I 2N =0.06kA;
[0110] Transformer on-load voltage regulation range: within ±5% V 2N ;
[0111] Rated phase voltage on the load side of the transformer: V 2N =5.78kV, V 2NH =6.07kV, V 2NL = ...
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The invention discloses a decoupling coordination method for realizing optimal target control based on voltage reactive decoupling criteria. The decoupling coordination method comprises the following steps: using the formula that V2=V20-delta VQ-delta VP as a decoupling control model to construct V-IQ three-dimensional decoupling coordination control criterion; performing reactive compensation regulation according to delta VQ criterion, and performing the adjustment of real-time no-load voltage according to V20 criterion; using the linear characteristics of the combined criterion V2+delta VQ and V2+delta VP to form a V-IQ nine-area or multi-area coordination characteristic model required for establishing a two-dimensional control strategy and form a three-dimensional comprehensive coordination model capable of visually showing real-time status data; determining an optimal regulation amount in real time by quantifying an optimal target model in a three-dimensional control target domain and using an optimal regulation amount algorithm; and using a predicated formula of V-IQ criterion to predict the regulation effect and variation trend of V-IQ. The method enables VQC to realize labor division cooperation and accurate coordination of voltage regulation and reactive compensation, so that the operational reliability and the efficiency of putting into operation are improved, and the optimal target control and visual control are realized.
Description
technical field [0001] The invention relates to the technical field of electric power system automation control, in particular to a decoupling coordination method for realizing optimal target control based on voltage and reactive power decoupling criteria. Background technique [0002] With the continuous expansion of the scale of the power system, the problems of energy saving and loss reduction, harmonic control and voltage stability are becoming more and more prominent. The investment of new reactive power compensation equipment, such as the combined use of SVG (Static Var Generator, static var generator) and VQC (Voltagevar Quality Control, voltage reactive power control) device, requires optimized coordinated control to cooperate with it. In particular, the development of smart grids and smart substations requires the automatic voltage and reactive power control system and VQC devices to make good use of real-time state data, establish an online optimized VQC algorithm ...
Claims
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IPC IPC(8): H02J3/16
CPCY02E40/30
Inventor 傅辉明傅莹
Owner 傅辉明