我国分布式新能源发电发展迅猛。微电网作为分布式新能源并网的一种主要承载方式，受到广泛关注。为解决新能源发电缺乏惯性引起系统安全稳定问题，虚拟同步机（Virtual Synchronous Generator，VSG）技术应运而生。然而，随着VSG技术在微电网中的推广应用，在实际工程中多VSG微电网中有功角频率振荡问题、无功均衡分配问题日益凸显，亟待深入研究。1、本论文开展基于相邻信息的多VSG协同控制及稳定性分析的研究。通过理论推导，本论文揭示了多VSG孤岛微电网系统振荡的根本原因。针对孤岛微电网系统中有功负载波动引起的频率和功率振荡问题，提出了一种基于相邻信息的多VSG有功控制策略（Cooperative Control Strategy based on Proximity Information，CCSPI）。所提控制策略解决孤岛微电网在扰动下各VSG间瞬时有功分配不均和瞬时频率超调的问题，有效抑制了系统频率和功率的振荡。通过仿真验证了所提控制策略对系统的动态性能的改善和优化效果。2、本论文开展含电压恢复的新型VSG无功控制的分析研究。通过理论推导，本论文揭示了传统VSG控制策略中输出无功受制于出线阻抗约束的内在机理。针对无功功率不能按照VSG容量进行均分的问题，提出了一种含电压恢复的无功功率控制策略（Novel Control Strategy with Voltage Recovery，NCSVR），并从理论层面推导证明了所提无功控制策略可以摆脱VSG输出无功对出线阻抗的依赖，在出线阻抗极端错配时，仍可实现无功均分。通过建立多VSG孤岛微电网状态空间模型，对影响控制参数选取的关键因素进行定量分析。通过仿真实验，对所提无功控制策略的有效性、准确性和通用性进行了验证。3、本论文开展了多VSG孤岛微电网的有功无功联合控制研究。针对因有功无功控制不能完全解耦导致的VSG联合控制动态性能劣化的问题，本论文提出了一种基于相邻信息的多VSG协同联合控制策略（Collaborative Joint Control based on Proximity Information，CJCPI）。所提协同联合控制策略能够缓解VSG间输出功率分布不均的难题，实现了对VSG输出频率、电压、有功功率和无功功率的振荡抑制。通过仿真分析，验证了所提出协同联合控制策略的有效性和优越性。最终，本论文构建了一个能同时实现多VSG孤岛微电网有功角频率振荡抑制和无功负载均衡分配的控制策略。

China‘s distributed renewable energy power generation has seen rocketing growth. Microgrid, as a main way of undertaking in distributed new energy grid connection, has been widely concerned. To solve the problem of system security and stability caused by the lack of inertia in distributed renewable energy generation, virtual synchronous generator (VSG) technology came into being. However, with the application and promotion of VSG technology in practical engineering, the problems of active power and angular frequency oscillation, and reactive power balance distribution in microgrid are increasingly prominent, which need to be further researched.1. Based on the working principle of VSG, this paper theoretically analyzes and reveals the fundamental cause of oscillation in the islanded microgrid system with multiple VSGs. Aiming at the angular frequency and power oscillation caused by active load fluctuation in islanded microgrid system, a multi-VSG active power Cooperative Control Strategy based on Proximity Information is proposed. The proposed control strategy solves the problems of uneven distribution of instantaneous active power between VSGs and instantaneous angular frequency overshoot of islanded microgrid under disturbance, and effectively suppresses the oscillation of system angular frequency and power. The improvement and majorization effects of the proposed control strategy on the dynamic properties of the system were proved through simulation.2. Through theoretical derivation, this paper reveals the inherent mechanism that the output reactive power in the traditional VSG control strategy is constrained by the output impedance. Aiming at the problem that the reactive load cannot be divided equally according to the capacity of VSG; a reactive power Novel Control Strategy with Voltage Recovery (NCSVR) control strategy is proposed. The proposed VSG reactive power control strategy can get rid of the dependence of output reactive power on the output impedance constraint from the mathematical and theoretical levels, and it can still achieve the balanced distribution of reactive power load when the output impedance configuration appears extreme conditions. Furthermore, by establishing the complete state space model of an islanded microgrid with multiple VSGs, the key factors affecting the selection of main control parameters are analyzed. The effectiveness, accuracy and generality of the reactive power control strategy based on NCSVR are verified by simulation experiments.3. Finally, this paper conducted research on joint control of islanded microgrid with multiple VSGs. In response to the problem of dynamic performance degradation of VSG joint control caused by incomplete decoupling of active and reactive power control, this paper proposes a VSG Collaborative Joint Control based on Proximity Information (CJCPI). The proposed collaborative joint control strategy can alleviate the problem of uneven distribution of output power between VSGs, and achieve oscillation suppression of VSG output angular frequency, voltage, active power, and reactive power. The effectiveness and superiority of the proposed collaborative joint control strategy were verified through simulation analysis. In general, this paper constructs a novel control strategy that can simultaneously suppress power angular frequency oscillation and balance reactive load distribution in islanded microgrid with multiple VSGs.