CN-121036238-B - High-proportion renewable energy source electric energy quality adjustment resource cooperation-autonomous method

CN121036238BCN 121036238 BCN121036238 BCN 121036238BCN-121036238-B

Abstract

The invention provides a high-proportion renewable energy power quality adjustment resource cooperation-autonomy method, which belongs to the field of energy and comprises the steps of constructing a phase angle feedforward VSG single machine active-frequency control model, constructing a phase angle feedforward compensation VSG system active-frequency response model according to the phase angle feedforward VSG single machine active-frequency control model, deducing a phase angle feedforward parameter optimal configuration method of the phase angle feedforward compensation VSG system active-frequency response model, and realizing the cooperation-autonomy of the high-proportion renewable energy power quality adjustment resource by constructing a three-layer control framework of local perception-neighborhood cooperation-global stability. The invention completely maintains the inertia response adjusting capability of the system while realizing the cooperative suppression of the active oscillation.

Inventors

DENG WEI
WANG YI
WEI HUIFENG
ZHANG SHUO
ZHAO ZHENXING
WANG ZHENXIONG
LI HUITAO
YI HAO
ZHANG RUNFAN
YANG ZEBIN
YU KAIJI

Assignees

中国科学院电工研究所
西安交通大学
国网河南省电力公司

Dates

Publication Date: 20260512
Application Date: 20251017

Claims (8)

1. The high-proportion renewable energy source electric energy quality adjustment resource cooperation-autonomy method is characterized by comprising the following steps: step 1, constructing a phase angle feedforward VSG single machine active-frequency control model, wherein VSG represents a virtual synchronous generator; Step 2, constructing an active-frequency response model of the phase angle feedforward compensation VSG system according to the phase angle feedforward VSG single machine active-frequency control model; Step 3, deducing a phase angle feedforward parameter optimal configuration method of an active-frequency response model of a phase angle feedforward compensation VSG system, realizing autonomous parameter matching and oscillation suppression of the multi-VSG system by constructing a three-layer control architecture of local perception-neighborhood cooperation-global stability, eliminating active oscillation after disturbance, and realizing cooperation-autonomy of high-proportion renewable energy power quality adjustment resources, comprising the following steps: Step 31, dynamically identifying the equivalent impedance of the system, independently operating an impedance observer by each VSG to avoid dependence on global communication, and simultaneously adopting a sliding window mean value filtering technology to realize equivalent impedance of the local system of the ith VSG Smoothing to obtain filtered impedance value : (1) Wherein T w is the time window length, T is the time variable, dτ is the integral variable; Step 32, performing distributed collaborative optimization setting, which comprises constructing an objective function comprising impedance matching and neighborhood consistency, independently executing iteration by each VSG through a distributed alternating direction multiplier method, updating an even variable, introducing inertial-damping characteristic protection constraint, and defining a compensation upper limit; the constructed objective function comprising the consistency of impedance matching and neighborhood is as follows: (2) Wherein, K Ji ,K Di is the inertia coefficient of the ith VSG, the per unit value of the primary frequency modulation coefficient, K δi' and K δj' are the phase angle feedforward compensation coefficients of the ith and jth VSGs, lambda is the neighborhood cooperative weight coefficient factor, N (i) is the physical adjacent set of the ith VSG, and s is the Laplacian operator.
2. A high-proportion renewable energy power quality adjustment resource co-autonomous method according to claim 1, wherein said step 1 comprises: And simulating dynamic characteristics of the synchronous generator, calculating a difference value by using the power mutation amount, compensating to an output phase angle through a proportional feedforward link, and rapidly adjusting power to form a phase angle feedforward VSG single machine active-frequency control model.
3. A high-proportion renewable energy power quality adjustment resource co-autonomous method according to claim 2, characterized in that said step 2 comprises: Constructing an active power change linear expression of a multi-VSG parallel operation system; after small signal linearization at the steady-state operating point P 0 , the active power variation output by the VSG is related to the load power variation and the phase angle difference variation between other VSGs, and after linearization, the active power variation is expressed as: (3) Wherein Δp Ei is the active power variation output by the i-th VSG, Δp L is the load power variation, Δδ ij is the phase angle difference variation between the i-th VSG and the j-th VSG, W ii 、W ij is the power linear coefficient and the phase angle linear coefficient, respectively, and n is the number of VSGs.
4. A high-proportion renewable energy power quality regulating resource co-autonomous method according to claim 3, characterized in that W ii 、W ij is represented as: (4) Wherein G ij0 is the conductance value of G ij at the steady-state operating point P 0 , B ij0 is the susceptance value of G ij at the steady-state operating point P 0 , delta ij0 is the delta ij phase angle difference between the ith VSG and the jth VSG at the steady-state operating point P 0 , K ij and H ij are the linear coefficients of the conductance value G ij and the susceptance value B ij relative to the load power variation delta P L , E i and E j are the electromotive forces of the ith and jth VSGs respectively; And constructing an n-phase angle feedforward compensation VSG system active-frequency response model based on the active power change linear expression of the multi-VSG parallel operation system.
5. The high-proportion renewable energy power quality adjustment resource co-autonomous method of claim 4, wherein said step 3 comprises: step 31, performing dynamic identification of the equivalent impedance of the system, including: Equivalent impedance of local system of ith VSG (T) is defined as: (5)。
6. The high-proportion renewable energy power quality adjustment resource co-autonomous method of claim 1, wherein each VSG independently performs iterations using a distributed alternating direction multiplier method comprising: The local variable is updated as: (6) Wherein argmin represents an input value set when the objective function is solved to obtain the minimum value, ρ is a penalty factor, 1, i and j represent the serial numbers of VSG in the system, And K is the iteration number for dual variables, and the convergence condition is that the K δi' variation of adjacent iterations is less than 10 -3 .
7. The high-proportion renewable energy power quality adjustment resource co-autonomous method of claim 6, wherein the dual variable is updated as: (7)。
8. a high-proportion renewable energy power quality adjustment resource co-autonomous method according to claim 7, characterized in that the upper limit of compensation is defined as: (8) where α is the inertial retention factor.

Description

High-proportion renewable energy source electric energy quality adjustment resource cooperation-autonomous method Technical Field The invention belongs to the field of energy sources, and particularly relates to a high-proportion renewable energy source power quality adjustment resource cooperation-autonomy method. Background With the rapid development of new energy power generation technology, the rapid development of a distributed micro-grid containing high-proportion photovoltaic and wind power is carried out, and the voltage frequency stable control in an island mode faces new challenges. The Virtual Synchronous Generator (VSG) technology is a core means of network construction control because of being capable of autonomously constructing the voltage frequency of a power grid, and the transient stability of the system is remarkably improved by simulating the inertia-damping characteristic of the synchronous motor. However, in engineering practice, it is found that the active power overshoot and the frequency oscillation phenomenon occur in the dynamic process due to the cooperative mismatch of the adjustment resource parameter (inertia/damping coefficient) and the network impedance, and even the system instability is induced under the extreme working condition. The existing improvement scheme is mainly developed along two directions, namely, optimizing unit-level control parameters through an intelligent algorithm and constructing a local impedance compensation network. However, the former has engineering applicability problems such as difficulty in collaborative optimization of multidimensional parameters, poor algorithm convergence and the like, and the latter can weaken the inertial response characteristic of the system and influence transient stability margin. More importantly, the prior research has the theoretical limitation that the compensation effect of virtual impedance and network parameters have strong coupling relation, and the prior parameter optimization model does not establish an impedance matching constraint mechanism of multi-machine cooperative operation. This results in the mutual constraint of oscillation suppression and dynamic performance in practical systems, exposing the inherent drawbacks of conventional hierarchical control architecture in terms of system level co-regulation. Therefore, a new power quality control method based on a resource coordination-autonomous mechanism is urgently needed. Disclosure of Invention In order to solve the technical problems, the invention provides a high-proportion renewable energy power quality adjustment resource cooperation-autonomy method, and provides a multi-machine cooperation-autonomy adjustment method based on phase angle feedforward compensation in a micro-grid isolated network operation environment. According to the method, the active output phases of all the adjusting units are dynamically corrected, the autonomous matching relation between the multiple machine parameters and the network impedance is established, and the inertia response adjusting capacity of the system is completely reserved while the active oscillation cooperative suppression is realized. In order to achieve the above purpose, the invention adopts the following technical scheme: A high-proportion renewable energy source electric energy quality adjustment resource cooperation-autonomy method comprises the following steps: step 1, constructing a phase angle feedforward VSG single machine active-frequency control model; Step 2, constructing an active-frequency response model of the phase angle feedforward compensation VSG system according to the phase angle feedforward VSG single machine active-frequency control model; And 3, deducing a phase angle feedforward parameter optimal configuration method of an active-frequency response model of the phase angle feedforward compensation VSG system, and realizing autonomous parameter matching and oscillation suppression of the multi-VSG system, eliminating active oscillation after disturbance and realizing high-proportion renewable energy power quality adjustment resource coordination-autonomy by constructing a three-layer control architecture of local perception-neighborhood coordination-global stability. The beneficial effects are that: 1. The invention constructs a double-layer control paradigm of 'autonomous adjustment-cooperative compensation', and effectively decouples the coupling relation between parameter optimization and impedance compensation; 2. The distributed feedforward compensation mechanism is adopted, so that communication dependence of a central controller is avoided; 3. The invention only needs to keep the consistency of the phase compensation parameters when the system is expanded, has natural topological adaptability, and provides a brand new electric energy quality adjustment solution for a high-proportion renewable energy system. Drawings FIG. 1 is a phase angle feedforward compensation VSG active co